Energy-saving and environment-friendly vacuum injection molding structure

Abstract

The energy-saving and environment-friendly vacuum injection molding structure comprises an injection device used for injecting molten materials, and the injection device comprises an injection material barrel, an injection screw arranged in the injection material barrel and a feeding mechanism for feeding the injection material barrel; the injection charging barrel comprises a melt feeding hole; the feeding mechanism comprises a melt blanking port communicated with the melt feeding port; a melt blanking port of the feeding mechanism and a melt feeding port of the injection charging barrel are arranged at an interval and form a vacuum cavity; and a vacuumizing mechanism communicated with the vacuum cavity is connected outside the vacuum cavity. The melt blanking port of the feeding mechanism and the melt feeding port of the injection charging barrel are arranged at an interval and form the vacuum cavity, so that melt falling from the melt blanking port has a certain distance when falling into the melt feeding port, and sufficient time is provided for air exhaust operation of the vacuumizing mechanism; impurities such as decomposed substance gas and moisture of the melt can be discharged more sufficiently; in the vacuum pumping process, decomposed substance gas, moisture and other impurities can be discharged, drying is not needed, and more energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to an energy-saving and environment-friendly vacuum injection molding structure. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. The working principle of the injection molding machine is similar to that of a syringe for injection. It uses the thrust of the screw (or plunger) to inject the plasticized molten state (i.e. viscous flow state) plastic into the closed mold cavity, and obtains the product after solidification and finalization.

[0003] During the entire process, due to incomplete drying of raw materials, small molecule plastics in raw materials, ingress of humid air, high-temperature decomposition of raw materials and other reasons, problems such as bubbles, silver threads, and degradation of physical properties will appear during molding, affecting the appearance, quality and production efficiency of the finished products, and the high defective and scrap rates increase production costs. At the same time, the raw materials must be dried before production, which greatly increases energy consumption; the discharged decomposition gases are not easy to collect and purify, polluting the environment. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is to provide an energy-saving and environmentally friendly vacuum injection molding structure, in which the melt drop port of the feeding mechanism and the melt inlet of the injection barrel are spaced apart and a vacuum cavity is formed, so that the molten material falling from the melt drop port falls into the melt inlet at a certain distance, which provides sufficient time for the vacuum operation of the vacuum pumping mechanism. At the same time, the vacuum cavity and the injection barrel are connected, and a vacuum is also formed in the injection barrel, so that the gas, moisture and other impurities in the molten material can be discharged more fully.

[0006] (II) Technical solution

[0007] The solution adopted by the present invention to solve the above technical problems is an energy-saving and environmentally friendly vacuum injection molding structure, including an injection device for injecting molten material, the injection device including an injection barrel, an injection screw arranged in the injection barrel, and a feeding mechanism for feeding the injection barrel;

[0008] The injection barrel includes a melt inlet;

[0009] The feeding mechanism comprises a melt dropping port communicated with the melt inlet;

[0010] The melt discharge port of the feeding mechanism and the melt inlet of the injection barrel are spaced apart and form a vacuum cavity, so that the melt discharge port is suspended above the melt inlet; a vacuum extraction mechanism in communication with the vacuum cavity is connected outside the vacuum cavity.

[0011] By adopting the above scheme, the melt discharge port of the feeding mechanism and the melt inlet of the injection barrel are spaced apart and a vacuum chamber is formed, so that the molten material falling from the melt discharge port falls into the melt inlet at a certain distance, which provides sufficient time for the vacuuming operation of the vacuuming mechanism. At the same time, the vacuum chamber and the injection barrel are connected, and a vacuum is also formed in the injection barrel, so that the decomposition material gas, moisture and other impurities in the molten material can be discharged more fully; at the same time, compared with the existing molten material that requires additional drying operation during the transportation process, the above structure can discharge the decomposition material gas, moisture and other impurities during the vacuuming process without drying, which is more energy-saving; and, compared with the existing molten material that generates gas directly into the air during the transportation process, which causes pollution, the above structure can centrally treat the gas after it is extracted during the vacuuming process, which is more environmentally friendly; the decomposition substances in the melt are removed, and the product quality is better.

[0012] In some embodiments, the injection barrel is connected to a vacuum chamber, the vacuum chamber has a vacuum cavity, and the vacuum chamber is provided with the vacuum pumping mechanism communicating with the vacuum cavity;

[0013] The feeding mechanism includes a feeding rod, and the melt discharge port is arranged at one end of the feeding rod close to the injection barrel; and the feeding rod partially extends into the vacuum chamber, and the melt discharge port of the feeding rod is arranged directly above the melt inlet of the injection barrel and is suspended and spaced apart from the melt inlet of the injection barrel.

[0014] Specifically, the melt dropping port is arranged directly above the melt inlet, so that the direction of the melt dropping from the melt dropping port to flow to the melt inlet is more precise, thereby improving the efficiency of the melt entering the melt inlet.

[0015] In some embodiments, the vacuum chamber is provided with an exhaust port along the feeding direction of the feeding rod above the melt dropping port, the exhaust port penetrates the vacuum chamber and forms an exhaust channel communicating with the vacuum cavity; and the vacuum pumping mechanism is connected to the exhaust port.

[0016] In some embodiments, the exhaust port extends transversely through the vacuum chamber.

[0017] By adopting the above scheme, the exhaust port is arranged at one end of the melt dropping port away from the melt inlet port; so that the flow direction of the molten material falling from the melt dropping port to the melt inlet port is opposite to the exhaust direction when the vacuum mechanism is evacuating air, which can ensure that the flow of the molten material will not flow back.

[0018] In some embodiments, the vacuum chamber is integrally formed on the injection barrel.

[0019] In some embodiments, the vacuum chamber is detachably connected to the injection barrel by screws, which is convenient for disassembly and assembly, and facilitates subsequent maintenance and replacement.

[0020] In some embodiments, the vacuum chamber is provided with a viewing window for observing the vacuum cavity.

[0021] Specifically, one of the side walls of the vacuum chamber is made of a transparent material and forms the viewing window, so that the operator can observe the condition of the vacuum chamber.

[0022] In some embodiments, the vacuum chamber has a temperature control mechanism capable of controlling the temperature.

[0023] Specifically, the temperature control mechanism may be a temperature control mechanism provided by the vacuum chamber itself; or may be a temperature control mechanism connected to the vacuum chamber.

[0024] By adopting the above scheme, the setting of the temperature control mechanism can control the temperature of the vacuum chamber to ensure that the melt is always in a molten state.

[0025] In some embodiments, the conveying capacity of the injection screw within the injection barrel is greater than the conveying capacity of the feeding mechanism.

[0026] In some embodiments, the feeding mechanism includes a feeding screw, and the conveying capacity of the injection screw is controlled to be greater than the conveying capacity of the feeding screw; the molten material falling from the melt dropping port into the melt inlet port can be quickly conveyed to prevent the molten material from accumulating in the vacuum chamber.

[0027] Specifically, the conveying capacity of the screw refers to the amount of material conveyed per unit time; the conveying capacity is affected by many factors, including screw diameter, pitch, rotation speed, and conveying angle. Specifically, the conveying capacity of the screw is closely related to the screw diameter, pitch, and rotation speed; the larger the screw diameter, the greater the conveying capacity; the pitch determines the screw's lead angle, which affects the material conveying process; the rotation speed affects the conveying volume within a certain range, and too high a rotation speed may cause the material to be thrown out due to centrifugal force. In addition, the conveying angle will also affect the required power and total resistance. The surface quality of the screw and the gap with the barrel wall will also affect the conveying capacity. The rougher the screw surface, the lower the conveying capacity; and the larger the gap between the screw and the barrel wall, the lower the conveying capacity.

[0028] In some embodiments, the feeding mechanism includes a feeding rod vertically arranged relative to the injection barrel, and a feeding channel is arranged in the feeding rod along its length direction; the feeding channel is provided with the melt drop port at one end close to the melt inlet of the injection barrel, and a feed port is arranged at the other end; and, the feeding rod is connected to a feeding barrel at one end thereof located at the feed port, and a feeding screw is arranged in the feeding barrel; and, the feeding barrel includes a discharge port communicated with the feed port of the feeding rod.

[0029] Specifically, the feeding screw can process solid raw materials into melted materials and transport the melted materials into the feeding rod.

[0030] In some embodiments, a feeding connector is provided at one end of the feeding barrel close to the feed port of the feeding rod, the feeding connector is placed between the feeding barrel and the feeding rod, and has a connecting channel to connect the feeding barrel and the feeding rod to complete the transportation of the molten material; and the connecting channel includes a first channel communicated with the feeding barrel, and a second channel communicated with the feeding channel of the feeding rod; and the cross-section of the first channel is frustum-shaped, and the end close to the feeding barrel is a large-mouth end, and the end close to the feeding rod is a small-mouth end; the first channel has the same axial diameter as the small-mouth end of the first channel, and the same axial diameter as the feeding channel; the above structure is adopted, so that the molten material of the feeding barrel can be evenly and smoothly transported to the feeding channel of the feeding rod.

[0031] In some embodiments, the vacuum chamber is open at one end away from the injection barrel; a closing cover capable of closing the opening is provided on the middle part of the feeding rod, so that part of the feeding rod extends into the vacuum chamber and part is placed outside the vacuum chamber.

[0032] In some embodiments, the feeding barrel is arranged transversely relative to the feeding rod; or, the feeding barrel is arranged vertically relative to the feeding rod.

[0033] Specifically, the feeding barrel is arranged horizontally relative to the feeding rod, which means that the feeding barrel is arranged vertically on one end of the feeding port of the feeding rod; the feeding barrel is arranged vertically relative to the feeding rod, which means that the arrangement direction of the feeding barrel is the same as the arrangement direction of the feeding rod, then the conveying direction of the molten material by the feeding barrel and the conveying direction of the molten material by the feeding rod are on the same straight line, thereby improving the conveying efficiency of the molten material.

[0034] (III) Beneficial effects

[0035] Compared with the prior art, the present invention designs an energy-saving and environment-friendly vacuum injection molding structure.

[0036] (1) The present invention arranges the melt outlet of the feeding mechanism and the melt inlet of the injection barrel at intervals and forms a vacuum chamber, so that the melt falling from the melt outlet falls into the melt inlet at a certain distance, which provides sufficient time for the vacuuming operation of the vacuuming mechanism. At the same time, the vacuum chamber and the injection barrel are connected, and a vacuum is also formed in the injection barrel, so that the gas, moisture and other impurities in the melt are discharged more fully;

[0037] (2) Compared with the existing molten material which needs additional drying operation during the transportation process, the above structure can discharge impurities such as decomposed material gas and water during the exhaust process without drying, which is more energy-saving;

[0038] (3) Compared with the existing method of directly discharging the gas generated during the transportation of the molten material into the air, which causes pollution, the above structure can centrally process the gas after it is extracted during the exhaust process, which is more environmentally friendly; the decomposed substances in the melt are removed, and the product quality is better;

[0039] (4) The present invention arranges the melt drop port just above the melt inlet, so that the direction of the melt falling from the melt drop port to the melt inlet is more accurate, thereby improving the efficiency of the melt entering the melt inlet;

[0040] (5) The exhaust port is arranged at one end of the melt discharge port away from the melt inlet port, so that the flow direction of the melt falling from the melt discharge port to the melt inlet port is opposite to the exhaust direction when the vacuum pumping mechanism is evacuating air, thereby ensuring that the flow of the melt does not flow back;

[0041] (6) The present invention sets the conveying capacity of the injection screw to be greater than the conveying capacity of the feeding screw; the molten material falling from the melt drop port into the melt feed port can be quickly conveyed to prevent the molten material from accumulating in the vacuum chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a structural schematic diagram of an energy-saving and environment-friendly vacuum injection molding structure of the present invention;

[0044] Figure 2 A cross-sectional view of an energy-saving and environment-friendly vacuum injection molding structure of the present invention;

[0045] Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle;

[0046] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0047] The names of the components corresponding to the various figure marks in the figure are: 100, injection barrel; 101, melt inlet; 200, injection screw; 300, feeding mechanism; 301, melt drop port; 302, feeding rod; 302a, feeding channel; 302b, closing cover; 303, feeding port; 304, feeding barrel; 304a, discharge port; 305, feeding screw; 306, feeding connector; 3061, connecting channel; 3061a, first channel; 3061b, second channel; 400, vacuum chamber; 500, vacuum chamber; 501, exhaust port; 501a, exhaust channel; 502, visual window. DETAILED DESCRIPTION

[0048] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0051] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0052] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0053] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0054] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0055] like Figure 1-Figure 4As shown, the present invention provides an energy-saving and environment-friendly vacuum injection molding structure, including an injection device for injecting molten material, the injection device including an injection barrel 100, an injection screw 200 arranged in the injection barrel 100, and a feeding mechanism 300 for feeding the injection barrel 100; the injection barrel 100 includes a melt inlet 101; the feeding mechanism 300 includes a melt drop port 301 communicated with the melt inlet 101; the melt drop port 301 of the feeding mechanism 300 and the melt inlet 101 of the injection barrel 100 are arranged at intervals and form a vacuum cavity 400, so that the melt drop port 301 is suspended above the melt inlet 101; the vacuum cavity 400 is externally connected to a vacuum extraction mechanism communicated with the vacuum cavity 400. By adopting the above scheme, the melt discharge port 301 of the feeding mechanism 300 and the melt inlet 101 of the injection barrel 100 are spaced apart and a vacuum chamber 400 is formed, so that the molten material dropped from the melt discharge port 301 falls into the melt inlet 101 at a certain distance, which provides sufficient time for the vacuuming operation of the vacuuming mechanism. At the same time, the vacuum chamber 400 is connected to the injection barrel 100, and a vacuum is also formed in the injection barrel 100, so that the gas, moisture and other impurities in the molten material can be discharged more fully; at the same time, compared with the existing molten material that requires additional drying operation during the transportation process, the above structure can discharge the decomposition material gas, moisture and other impurities during the exhaust process without drying, which is more energy-saving; and, compared with the existing molten material that generates gas directly into the air during the transportation process, which will cause pollution, the above structure can centrally process the gas after it is extracted during the exhaust process, which is more environmentally friendly; the decomposed substances in the melt are removed, and the product quality is better.

[0056] In some embodiments, the injection barrel 100 is connected to a vacuum chamber 500, the vacuum chamber 500 has a vacuum cavity 400, and the vacuum chamber 500 is provided with the vacuum pumping mechanism communicated with the vacuum cavity 400; the feeding mechanism 300 includes a feeding rod 302, and the feeding rod 302 is provided with the melt discharge port 301 at one end close to the injection barrel 100; and the feeding rod 302 partially extends into the vacuum chamber 500, and the melt discharge port 301 of the feeding rod 302 is provided directly above the melt inlet 101 of the injection barrel 100, and is suspended and spaced apart from the melt inlet 101 of the injection barrel 100. Specifically, the melt drop port 301 is arranged just above the melt inlet 101, so that the melt falling from the melt drop port 301 flows to the melt inlet 101 more accurately, thereby improving the efficiency of the melt entering the melt inlet 101. In some embodiments, the vacuum chamber 500 is provided with an exhaust port 501 above the melt drop port 301 along the feeding direction of the feeding rod 302, and the exhaust port 501 penetrates the vacuum chamber 500 and forms an exhaust channel 501a communicating with the vacuum chamber 400; and the vacuum pumping mechanism is connected to the exhaust port 501. In some embodiments, the exhaust port 501 penetrates the vacuum chamber 500 horizontally. By adopting the above scheme, the exhaust port 501 is arranged at the end of the melt drop port 301 away from the melt inlet 101; so that the flow direction of the molten material falling from the melt drop port 301 to the melt inlet 101 is opposite to the exhaust direction when the vacuum pumping mechanism is evacuating air, which can ensure that the flow of the molten material will not flow back. In some embodiments, the vacuum chamber 500 is integrally formed on the injection barrel 100.

[0057] In some embodiments, the vacuum chamber 500 is provided with a visual window 502 for observing the vacuum cavity 400. Specifically, one of the side walls of the vacuum chamber 500 is made of a transparent material and forms the visual window 502, so that the operator can observe the status of the vacuum cavity 400.

[0058] In some embodiments, the vacuum chamber 500 has a temperature control mechanism capable of controlling temperature. Specifically, the temperature control mechanism may be a temperature control mechanism provided by the vacuum chamber 500. With the above solution, the temperature control mechanism may control the temperature of the vacuum chamber 500 to ensure that the melt is always in a molten state.

[0059] In some embodiments, the conveying capacity of the injection screw 200 in the injection barrel 100 is greater than the conveying capacity of the feeding mechanism 300. In some embodiments, the feeding mechanism 300 includes a feeding screw 305, and the conveying capacity of the injection screw 200 is controlled to be greater than the conveying capacity of the feeding screw 305; the molten material falling from the melt drop port 301 into the melt inlet 101 can be quickly conveyed to prevent the molten material from accumulating in the vacuum chamber 400. Specifically, the conveying capacity of the screw refers to the amount of material conveyed per unit time; the conveying capacity is affected by many factors, including the screw diameter, pitch, rotation speed, and conveying angle. Specifically, the conveying capacity of the screw is closely related to the screw diameter, pitch, and rotation speed; the larger the screw diameter, the greater the conveying capacity; the pitch determines the screw's lead angle, which affects the material conveying process; the rotation speed affects the conveying amount within a certain range, and too high a rotation speed may cause the material to be thrown out due to centrifugal force. In addition, the conveying angle will also affect the required power and total resistance. The surface quality of the screw and the gap with the barrel wall will also affect the conveying capacity. The rougher the screw surface, the lower the conveying capacity; and the larger the gap between the screw and the barrel wall, the lower the conveying capacity.

[0060] In some embodiments, the feeding mechanism 300 includes a feeding rod 302 vertically arranged relative to the injection barrel 100, and a feeding channel 302a is arranged in the feeding rod 302 along its length direction; the feeding channel 302a is provided with the melt discharge port 301 at one end close to the melt inlet 101 of the injection barrel 100, and a feed port 303 is arranged at the other end; and the feeding rod 302 is connected to a feeding barrel 304 at one end of the feed port 303 thereof, and a feeding screw 305 is arranged in the feeding barrel 304; and the feeding barrel 304 includes a discharge port 304a communicating with the feed port 303 of the feeding rod 302. Specifically, the feeding screw 305 can process the solid raw material into a melt in a molten state, and transport the melt to the feeding rod 302. In some embodiments, a feeding connector 306 is provided at one end of the feeding barrel 304 close to the feeding port 303 of the feeding rod 302. The feeding connector 306 is placed between the feeding barrel 304 and the feeding rod 302, and has a connecting channel 3061 to connect the feeding barrel 304 and the feeding rod 302 to complete the transportation of the molten material; and the connecting channel 3061 includes a first channel 3061a communicating with the feeding barrel 304, and a first channel 3061b communicating with the feeding rod 302. The second channel 3061b communicates with the feeding channel 302a; and the cross section of the first channel 3061a is a frustum, and the end close to the feeding barrel 304 is a large end, and the end close to the feeding rod 302 is a small end; the first channel 3061a has the same axial diameter as the small end of the first channel 3061a, and the same axial diameter as the feeding channel 302a; the above structure allows the molten material of the feeding barrel 304 to be uniformly and smoothly transported to the feeding channel 302a of the feeding rod 302. In some embodiments, the end of the vacuum chamber 500 away from the injection barrel 100 is open; the feeding rod 302 is provided with a closing cover 302b on the middle part thereof that can close the opening, so that part of the feeding rod 302 extends into the vacuum chamber 500 and part is placed outside the vacuum chamber 500. In some embodiments, the feeding barrel 304 is arranged vertically relative to the feeding rod 302. Specifically, the feeding barrel 304 is arranged vertically relative to the feeding rod 302, which means that the arrangement direction of the feeding barrel 304 is the same as the arrangement direction of the feeding rod 302. Then, the conveying direction of the molten material by the feeding barrel 304 and the conveying direction of the molten material by the feeding rod 302 are on the same straight line, thereby improving the conveying efficiency of the molten material.

[0061] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0062] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An energy-saving and environment-friendly vacuum injection molding structure, comprising an injection device for injecting molten material, characterized in that: The injection device comprises an injection barrel (100), an injection screw (200) disposed in the injection barrel (100), and a feeding mechanism (300) for feeding material to the injection barrel (100); The injection barrel (100) comprises a melt inlet (101); The feeding mechanism (300) comprises a melt discharge port (301) communicating with the melt inlet (101); The melt discharge port (301) of the feeding mechanism (300) and the melt inlet (101) of the injection barrel (100) are spaced apart and form a vacuum chamber (400), so that the melt discharge port (301) is suspended above the melt inlet (101); the vacuum chamber (400) is externally connected to a vacuum extraction mechanism that is in communication with the vacuum chamber (400).

2. The energy-saving and environment-friendly vacuum injection molding structure according to claim 1 is characterized in that: The injection barrel (100) is connected to a vacuum chamber (500), the vacuum chamber (500) has a vacuum cavity (400) therein, and the vacuum chamber (500) is provided with the vacuum extraction mechanism which is in communication with the vacuum cavity (400); The feeding mechanism (300) includes a feeding rod (302), and the melt discharge port (301) is provided at one end of the feeding rod (302) close to the injection barrel (100); and the feeding rod (302) partially extends into the vacuum chamber (500), and the melt discharge port (301) of the feeding rod (302) is arranged directly above the melt inlet (101) of the injection barrel (100), and is suspended and spaced apart from the melt inlet (101) of the injection barrel (100).

3. The energy-saving and environment-friendly vacuum injection molding structure according to claim 2 is characterized in that: The vacuum chamber (500) is provided with an exhaust port (501) above the melt drop port (301) along the feeding direction of the feeding rod (302); the exhaust port (501) penetrates the vacuum chamber (500) and forms an exhaust channel (501a) communicating with the vacuum cavity (400); and the exhaust port (501) is connected to the vacuum pumping mechanism.

4. The energy-saving and environment-friendly vacuum injection molding structure according to claim 2 is characterized in that: The vacuum chamber (500) is integrally formed on the injection barrel (100).

5. The energy-saving and environment-friendly vacuum injection molding structure according to claim 2 is characterized in that: The vacuum chamber (500) is detachably connected to the injection barrel (100).

6. The energy-saving and environment-friendly vacuum injection molding structure according to claim 2 is characterized in that: The vacuum chamber (500) has a temperature control mechanism capable of controlling the temperature.

7. The energy-saving and environment-friendly vacuum injection molding structure according to claim 1 is characterized in that: The conveying capacity of the injection screw (200) in the injection barrel (100) is greater than the conveying capacity of the feeding mechanism (300).

8. The energy-saving and environment-friendly vacuum injection molding structure according to claim 1 is characterized in that: The feeding mechanism (300) includes a feeding rod (302) vertically arranged relative to the injection barrel (100), and a feeding channel (302a) is arranged in the feeding rod (302) along its length direction; the feeding channel (302a) is provided with the melt discharge port (301) at one end close to the melt inlet (101) of the injection barrel (100), and a feeding port (303) is arranged at the other end; and, the feeding rod (302) is connected to a feeding barrel (304) at one end of the feeding rod (302) located at the feeding port (303), and a feeding screw (305) is arranged in the feeding barrel (304); and, the feeding barrel (304) includes a discharge port (304a) communicated with the feeding port (303) of the feeding rod (302).

9. The energy-saving and environment-friendly vacuum injection molding structure according to claim 8, characterized in that: The feeding barrel (304) is arranged transversely relative to the feeding rod (302).

10. The energy-saving and environment-friendly vacuum injection molding structure according to claim 8, characterized in that: The feeding barrel (304) is arranged vertically relative to the feeding rod (302).

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