Energy-saving injection molding machine with heat recovery function and use method

Abstract

The invention discloses an energy-saving injection molding machine with a heat recovery function and a use method, and belongs to the technical field of injection molding of injection molding machines, the energy-saving injection molding machine comprises a workbench and an injection molding machine main body mounted on the workbench, the injection molding machine main body comprises an injection molding module, a feeding module, a movable mold and a fixed mold, and the movable mold and the fixed mold are mounted on the injection molding module; the waste heat recycling mechanism can send cooling water with heat in a waste heat recycling area to the preheating pipe, the heat exchanger collects the heat and sends the heat back to the preheating pipe through the heat conduction pipe, the feeding barrel is preheated, the working time of the heater is shortened, heat recycling is achieved, and the energy-saving effect is improved. The refrigerator refrigerates the cooling water again, so that the cyclic utilization rate of the cooling water is improved, the use amount of the cooling water is reduced, the environment-friendly and energy-saving performance of the injection molding machine is further enhanced, and by arranging a control valve, a temperature sensor, a filter screen, a protective shell, heat preservation cotton and the like, stable operation of equipment is guaranteed, and the energy-saving effect is improved.

Description

Technical Field

[0001] The present invention relates to the injection molding technology field of injection molding machines, and specifically to an energy-saving injection molding machine with a heat recovery function and a usage method thereof. Background Art

[0002] An injection molding machine, also known as an injection molding press or an injection machine, is the main molding equipment for making various shaped plastic products from thermoplastic or thermosetting plastics using plastic molding dies. It is divided into vertical, horizontal, and all-electric types. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

[0003] Since a large amount of waste heat is generated during the injection molding process of the injection molding machine, but the existing injection molding machines do not have a heat recovery function, most of the heat is dissipated into the environment, resulting in a reduction in energy utilization rate and causing pollution to the air environment at the same time.

[0004] According to the patent publication number: CN214726248U, an injection molding machine with a heat recovery and utilization function includes a base, a feeding mechanism, and an injection molding mechanism. The feeding mechanism includes a hopper and a barrel. The discharge port of the hopper is communicated with one end of the barrel, and the other end of the barrel is connected to the injection molding mechanism. It further includes: a heat recovery mechanism, which includes: a water storage tank located on the side of the injection molding mechanism, and the heat in the injection molding mechanism is transferred to the water storage tank. The water storage tank has a cavity, and a partition is provided in the cavity to divide the cavity into a first water storage chamber and a second water storage chamber; a first conveying pipe, one end of which is communicated with the first water storage chamber and the other end is communicated with the upper part of the hopper; a second conveying pipe, one end of which is communicated with the second water storage chamber and the other end is communicated with the lower part of the hopper. The present utility model pre-heats the raw materials in the hopper to a relatively high temperature, reduces the heat required for the raw materials to be heated to the molten state, thereby greatly reducing the power consumption, and avoiding the waste caused by the heat loss after injection molding.

[0005] According to the above introduction, heat is generated when the injection molding machine is in use, but the existing injection molding machines do not have a heat recovery function, resulting in most of the heat being dissipated into the environment, leading to a reduction in energy utilization rate and causing pollution to the air environment at the same time, reducing the energy-saving effect of the injection molding machine. To solve the above-mentioned problems, an improved energy-saving injection molding machine with a heat recovery function and a usage method thereof are thus proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide an energy-saving injection molding machine with a heat recovery function and its usage method. The reserve tank is divided into a refrigeration area and a waste heat recovery area by a partition. The cooling mechanism can send the cooling water in the refrigeration area into the moving mold cavity to quickly cool the injection molding material and accelerate the molding speed. After absorbing heat, the cooling water flows back to the waste heat recovery area. The waste heat recovery and utilization mechanism can send the cooling water with heat in the waste heat recovery area to the preheating pipe. The heat exchanger collects the heat and sends it back to the preheating pipe through the heat conduction pipe to preheat the feeding barrel, reducing the working time of the heater, realizing the recovery and reuse of heat, improving the energy-saving effect. The refrigeration mechanism recovers the cooling water in the preheating pipe to the refrigeration area, and the refrigerator cools it again, improving the utilization rate of the cooling water circulation, reducing the amount of cooling water used, and further enhancing the environmental protection and energy-saving performance of the injection molding machine, so as to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: An energy-saving injection molding machine with a heat recovery function, including a workbench and an injection molding machine main body installed on the workbench. The injection molding machine main body includes an injection molding module and a feeding module, a moving mold and a fixed mold installed on the injection molding module, a feeding barrel and a feeding hopper installed on the feeding module. A reserve tank is installed on the top of the injection molding module. A partition is arranged in the inner cavity of the reserve tank, and the partition divides the cavity of the reserve tank into a refrigeration area and a waste heat recovery area;

[0008] A waste heat recovery and utilization mechanism matched with the waste heat recovery area is installed on the top of the reserve tank. One end of the waste heat recovery and utilization mechanism is communicated with a preheating pipe. The preheating pipe is spirally wound around the rear end of the surface of the feeding barrel. A heater is sleeved on the front end of the surface of the feeding barrel. The water outlet of the preheating pipe is communicated with a refrigeration mechanism, and one end of the refrigeration mechanism penetrates through the reserve tank and extends into the refrigeration area.

[0009] Preferably, a cooling mechanism for cooling the injection molding raw material is arranged at the position of the moving mold of the injection molding module. One end of the cooling mechanism is communicated with the refrigeration area, and the other end of the cooling mechanism is communicated with the waste heat recovery area.

[0010] Preferably, the waste heat recovery and utilization mechanism includes a first water suction pump. The first water suction pump is installed on the top of the reserve tank. The water inlet of the first water suction pump penetrates through the waste heat recovery area in the reserve tank through a first connecting pipe. The water outlet of the first water suction pump is communicated with a heat exchanger through a second connecting pipe. The water outlet of the heat exchanger is communicated with a heat conduction pipe. One end of the heat conduction pipe is communicated with the water inlet of the preheating pipe.

[0011] Preferably, the cooling mechanism includes a second water suction pump installed on the workbench. The water inlet of the second water suction pump is connected to a first refrigeration pipe, and one end of the first refrigeration pipe is connected to the refrigeration area in the reserve tank. The water outlet of the second water suction pump is connected to the moving mold of the injection molding module through a second refrigeration pipe. A cavity is formed in the moving mold for the cooling water to circulate therein, so as to cool the injection molding material. The water outlet of the moving mold is connected to a recovery pipe, and one end of the recovery pipe is connected to the waste heat recovery area of the reserve tank.

[0012] Preferably, the refrigeration mechanism includes a refrigerator installed at the top of the injection molding module and symmetrically located with respect to the heat exchanger. The water inlet of the refrigerator is connected to a return pipe, and one end of the return pipe is connected to the water outlet of the preheating pipe. The other end of the refrigerator is connected to a delivery pipe, and one end of the delivery pipe penetrates through the refrigeration area of the reserve tank.

[0013] Preferably, a temperature sensor is installed on the top of the reserve tank, and the detection end of the temperature sensor is located in the waste heat recovery area inside the reserve tank.

[0014] Preferably, a filter screen is installed in the inner cavity of the reserve tank. The filter screen is arranged in the refrigeration area of the reserve tank and is fixed at the position of the water outlet of the delivery pipe.

[0015] Preferably, a first control valve is installed on the heat conduction pipe, and a second control valve is installed on the return pipe.

[0016] Preferably, a protective shell is sleeved outside the preheating pipe and the heater, and a heat preservation cotton is sleeved on the surface of the heat conduction pipe.

[0017] According to an energy-saving injection molding machine with a heat recovery function described above, the present invention also provides a method for using an energy-saving injection molding machine, including the following steps:

[0018] Step 1: Divide the reserve tank into a refrigeration area and a waste heat recovery area by setting a partition board for storing cooling water and recovered hot water, so that the cooling mechanism can transport the cooling water to the cavity of the moving mold to cool the injection molding material, accelerating the molding speed of the injection molding material. Subsequently, the generated heat is absorbed by the cooling water and recovered to the waste heat recovery area in the reserve tank;

[0019] Step 2: The waste heat recovery and utilization mechanism can transport the cooled water with heat after recovery to the preheating pipe. During the transportation process, according to the monitoring of the temperature sensor, the waste heat recovery and utilization mechanism collects the heat in the cooled water and transports it to the inside of the preheating pipe, which can preheat the position of the feeding cylinder, saving the heating time of the feeding cylinder by the heater, being able to recover and utilize the heat generated by the main body of the injection molding machine, and improving the energy-saving effect of the main body of the injection molding machine;

[0020] Step 3: The set refrigeration mechanism can recycle the cooled water in the preheating pipe back to the refrigeration area of the storage tank. During the transportation process, the refrigeration mechanism can refrigerate the cooled water again, thereby improving the recycling rate of the cooled water, saving the usage amount of the cooled water by the main body of the injection molding machine, and further enhancing the environmental protection and energy-saving effect of the main body of the injection molding machine.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The present invention provides an energy-saving injection molding machine with a heat recovery function and a usage method. The waste heat recovery and utilization mechanism can send the cooled water with heat in the waste heat recovery area to the preheating pipe. The heat exchanger collects the heat and sends it back to the preheating pipe through the heat conduction pipe to preheat the feeding cylinder, reducing the working time of the heater, realizing the recovery and reuse of heat, and enhancing the energy-saving effect.

[0023] 2. The present invention provides an energy-saving injection molding machine with a heat recovery function and a usage method. The refrigeration mechanism recovers the cooled water in the preheating pipe to the refrigeration area, and the refrigerator refrigerates it again, improving the recycling rate of the cooled water, reducing the usage amount of the cooled water, further enhancing the environmental protection and energy-saving performance of the injection molding machine. By setting control valves, temperature sensors, filter screens, installing protective shells, heat insulation cotton, etc., the stable operation of the equipment is ensured, and the energy-saving effect is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall structural schematic diagram of the present invention;

[0025] Figure 2 is the top view of the main body structure of the injection molding machine of the present invention;

[0026] Figure 3 is the front view of the main body structure of the injection molding machine of the present invention;

[0027] Figure 4 is the front view plane sectional view of the main body structure of the injection molding machine of the present invention;

[0028] Figure 5 is the rear view schematic diagram of the main body structure of the injection molding machine of the present invention.

[0029] Markings in the figure: 1, workbench; 2, main body of injection molding machine; 201, injection molding module; 202, feeding module; 3, moving mold; 4, fixed mold; 5, feeding cylinder; 6, feed hopper; 7, reserve tank; 8, partition board; 9, refrigeration area; 10, waste heat recovery area; 11, waste heat recovery and utilization mechanism; 111, first water suction pump; 112, first connecting pipe; 113, second connecting pipe; 114, heat exchanger; 115, heat conduction pipe; 12, preheating pipe; 13, heater; 14, refrigeration mechanism; 141, refrigerator; 142, return pipe; 143, conveying pipe; 15, cooling mechanism; 151, second water suction pump; 152, first refrigeration pipe; 153, second refrigeration pipe; 154, recovery pipe; 16, temperature sensor; 17, filter screen; 18, first control valve; 19, second control valve; 20, protective shell; 21, heat preservation cotton. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] The present invention provides an energy-saving injection molding machine with a heat recovery function as Figures 1 to 5 shown, which includes a workbench 1 and a main body 2 of an injection molding machine installed on the workbench 1. The main body 2 of the injection molding machine includes an injection molding module 201 and a feeding module 202, a moving mold 3 and a fixed mold 4 installed on the injection molding module 201, a feeding cylinder 5 and a feed hopper 6 installed on the feeding module 202. A reserve tank 7 is installed on the top of the injection molding module 201. A partition board 8 is arranged in the inner cavity of the reserve tank 7. The partition board 8 divides the cavity of the reserve tank 7 into a refrigeration area 9 and a waste heat recovery area 10. The reserve tank 7 divides the refrigeration and waste heat recovery areas 10 through the partition board 8, laying a foundation for subsequent heat recovery and recycling, realizing the classified storage and management of cooling water in different temperature states, and facilitating subsequent cooling and waste heat utilization operations;

[0032] The top of the reserve tank 7 is equipped with a waste heat recovery and utilization mechanism 11 that is used in conjunction with the waste heat recovery area 10. One end of the waste heat recovery and utilization mechanism 11 is connected to a preheating pipe 12. The preheating pipe 12 is spirally wound around the rear end of the surface of the feeding cylinder 5. A heater 13 is sleeved on the front end of the surface of the feeding cylinder 5. The water outlet of the preheating pipe 12 is connected to a refrigeration mechanism 14. One end of the refrigeration mechanism 14 penetrates through the reserve tank 7 and extends into the refrigeration area 9. The waste heat recovery and utilization mechanism 11 is connected to the preheating pipe 12, and the preheating pipe 12 is wound around the feeding cylinder 5, which can utilize waste heat to preheat the feeding cylinder 5, reduce the individual working time of the heater 13, realize the recovery and utilization of waste heat generated during the injection molding process, reduce energy consumption, improve energy utilization efficiency, and enhance the energy-saving performance of the injection molding machine.

[0033] A cooling mechanism 15 for cooling the injection molding raw materials is arranged at the position of the moving mold 3 of the injection molding module 201. One end of the cooling mechanism 15 is connected to the refrigeration area 9, and the other end of the cooling mechanism 15 is connected to the waste heat recovery area 10. The cooling mechanism 15 connects the refrigeration area 9 and the waste heat recovery area 10, can send the cooling water in the refrigeration area 9 to the moving mold 3 to cool the injection molding raw materials, accelerate the molding speed, and the hot water after absorbing heat can flow back to the waste heat recovery area 10 to complete heat transfer, which not only accelerates production but also realizes heat circulation, improves production efficiency and promotes the effective utilization of heat at the same time.

[0034] The waste heat recovery and utilization mechanism 11 includes a first water suction pump 111. The first water suction pump 111 is installed on the top of the reserve tank 7. The water inlet of the first water suction pump 111 penetrates through the waste heat recovery area 10 in the reserve tank 7 through a first connecting pipe 112. The water outlet of the first water suction pump 111 is connected to a heat exchanger 114 through a second connecting pipe 113. The water outlet of the heat exchanger 114 is connected to a heat conduction pipe 115. One end of the heat conduction pipe 115 is connected to the water inlet of the preheating pipe 12. The first water suction pump 111 pumps water from the waste heat recovery area 10, collects heat through the heat exchanger 114, and then sends heat to the preheating pipe 12 through the heat conduction pipe 115, accurately realizing the extraction, exchange and transportation of waste heat, providing a stable heat source for preheating the feeding cylinder 5, and ensuring the high efficiency and stability of the waste heat recovery and utilization process.

[0035] The cooling mechanism 15 includes a second water suction pump 151. The second water suction pump 151 is installed on the workbench 1. The water inlet of the second water suction pump 151 is connected to a first refrigeration pipe 152. One end of the first refrigeration pipe 152 is connected to the refrigeration area 9 in the reserve tank 7. The water outlet of the second water suction pump 151 is connected to the moving mold 3 of the injection molding module 201 through a second refrigeration pipe 153. A cavity is formed in the moving mold 3 for the cooling water to circulate therein, so as to cool the injection molding material. The water outlet of the moving mold 3 is connected to a recovery pipe 154. One end of the recovery pipe 154 is connected to the waste heat recovery area 10 of the reserve tank 7. The second water suction pump 151 sends the cooling water in the refrigeration area 9 into the moving mold 3. The cavity in the moving mold 3 enables the cooling water to circulate and cool down. Then the hot water returns to the waste heat recovery area 10 through the recovery pipe 154. This process ensures the continuity and effectiveness of the cooling operation of the injection molding material, optimizes the cooling process, and further improves the integrity of heat recovery.

[0036] The refrigeration mechanism 14 includes a refrigerator 141. The refrigerator 141 is installed on the top of the injection molding module 201 and is symmetric with the position of the heat exchanger 114. The water inlet of the refrigerator 141 is connected to a return pipe 142. One end of the return pipe 142 is connected to the water outlet of the preheating pipe 12. The other end of the refrigerator 141 is connected to a delivery pipe 143. One end of the delivery pipe 143 penetrates through the refrigeration area 9 of the reserve tank 7. The refrigerator 141 receives the water from the water outlet of the preheating pipe 12 through the return pipe 142, and after refrigeration, it is sent back to the refrigeration area 9 through the delivery pipe 143, realizing the circulating refrigeration of the cooling water, improving the recycling rate of the cooling water, reducing the usage amount of the cooling water, lowering the production cost, and enhancing the environmental protection and energy-saving characteristics of the injection molding machine.

[0037] A temperature sensor 16 is installed on the top of the reserve tank 7. The detection end of the temperature sensor 16 is located in the waste heat recovery area 10 inside the reserve tank 7. The temperature sensor 16 can monitor the water temperature in the waste heat recovery area 10 in real time, providing a temperature basis for the operation of the heat exchanger 114, ensuring that the waste heat recovery and utilization process is reasonably adjusted according to the water temperature, and guaranteeing the accuracy of heat recovery and utilization.

[0038] A filter screen 17 is installed in the inner cavity of the reserve tank 7. The filter screen 17 is arranged in the refrigeration area 9 of the reserve tank 7 and is fixed at the position of the water outlet of the delivery pipe 143. The filter screen 17 filters the water from the water outlet of the delivery pipe 143 in the refrigeration area 9, preventing impurities from entering the cooling mechanism 15, ensuring the normal operation of each component of the cooling mechanism 15, reducing equipment failures caused by impurities, and extending the service life of the equipment.

[0039] A first control valve 18 is installed on the heat conduction pipe 115, and a second control valve 19 is installed on the return pipe 142. The first control valve 18 controls the heat flow of the heat conduction pipe 115, and the second control valve 19 controls the water flow of the return pipe 142, which can flexibly adjust the waste heat transfer and the cooling water return, improving the flexibility of equipment operation and the controllability of energy-saving effect.

[0040] A protective shell 20 is sleeved outside the preheating pipe 12 and the heater 13, and a heat insulation cotton 21 is sleeved on the surface of the heat conduction pipe 115. The protective shell 20 protects the preheating pipe 12 and the heater 13 from being damaged by accidental collision; the heat insulation cotton 21 wraps the heat conduction pipe 115 to reduce heat dissipation, ensuring the safety of the equipment while improving the heat transfer efficiency and further enhancing the energy-saving effect.

[0041] According to the energy-saving injection molding machine with heat recovery function described above, the present invention also provides a method for using an energy-saving injection molding machine, including the following steps:

[0042] Step 1: The reserve tank 7 is divided into a refrigeration area 9 and a waste heat recovery area 10 by setting a partition plate 8 for storing cooling water and recovered hot water. Thus, the cooling water can be conveyed to the cavity of the moving mold 3 by the cooling mechanism 15 to cool the injection molding material, accelerating the molding speed of the injection molding material. Subsequently, the generated heat is absorbed by the cooling water and recovered into the waste heat recovery area 10 of the reserve tank 7.

[0043] Step 2: The heat recovery and utilization mechanism 11 can convey the recovered cooling water with heat to the preheating pipe 12. During the conveying process, according to the monitoring of the temperature sensor 16, the heat in the cooling water is collected by the heat recovery and utilization mechanism 11 and conveyed to the inside of the preheating pipe 12, which can preheat the position of the feeding barrel 5, saving the heating time of the feeding barrel 5 by the heater 13, enabling the recovery and utilization of the heat generated by the injection molding machine main body 2, and improving the energy-saving effect of the injection molding machine main body 2.

[0044] Step 3: The cooling mechanism 14 can recycle the cooling water in the preheating pipe 12 to the refrigeration area 9 of the reserve tank 7 again. During the conveying process, the cooling water can be refrigerated again by the cooling mechanism, thereby improving the recycling rate of the cooling water, saving the consumption of cooling water by the injection molding machine main body 2, and further enhancing the environmental protection and energy-saving effect of the injection molding machine main body 2.

[0045] During specific use, first, the storage tank 7 is divided into a refrigeration area 9 and a waste heat recovery area 10 by a partition 8, storing cooling water and recovering hot water respectively. The cooling mechanism 15 sends the cooling water in the refrigeration area 9 to the cavity of the moving mold 3 to cool the injection molding material, accelerating the molding process. The water after absorbing heat flows back to the waste heat recovery area 10. The waste heat recovery and utilization mechanism 11 transports the cooling water with heat in the waste heat recovery area 10 to the preheating pipe 12. During transportation, the heat exchanger 114 collects the heat in the water according to the monitoring of the temperature sensor 16, and then sends the heat to the preheating pipe 12 through the heat conduction pipe 115 to preheat the feeding barrel 5, reducing the working time of the heater 13, realizing the recovery and utilization of heat, improving the energy-saving effect. The refrigeration mechanism 14 recovers the cooling water in the preheating pipe 12 to the refrigeration area 9. During transportation, the cooler 141 cools the water again, improving the recycling rate of the cooling water, reducing the water consumption, and enhancing the environmental protection and energy-saving performance of the injection molding machine.

[0046] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving injection molding machine with a heat recovery function, comprising a workbench (1) and an injection molding machine body (2) mounted on the workbench (1), characterized in that: The injection molding machine body (2) comprises an injection molding module (201) and a feeding module (202), a movable mold (3) and a fixed mold (4) mounted on the injection molding module (201), and a feeding cylinder (5) and a feeding hopper (6) mounted on the feeding module (202); a storage box (7) is mounted on the top of the injection molding module (201); a partition (8) is provided in the inner cavity of the storage box (7); and the partition (8) divides the cavity of the storage box (7) into a refrigeration area (9) and a waste heat recovery area (10); A waste heat recovery mechanism (11) for use with a waste heat recovery area (10) is installed on the top of the storage tank (7); one end of the waste heat recovery mechanism (11) is connected to a preheating pipe (12); the preheating pipe (12) is spirally wound around the rear end of the surface of the feeding cylinder (5); the front end of the surface of the feeding cylinder (5) is sleeved with a heater (13); the water outlet of the preheating pipe (12) is connected to a refrigeration mechanism (14); one end of the refrigeration mechanism (14) passes through the storage tank (7) and extends into the refrigeration area (9).

2. The energy-saving injection molding machine with heat recovery function according to claim 1, characterized in that: A cooling mechanism (15) for cooling the injection molding material is disposed at the movable mold (3) of the injection molding module (201); one end of the cooling mechanism (15) is connected to the refrigeration area (9); and the other end of the cooling mechanism (15) is connected to the waste heat recovery area (10).

3. The energy-saving injection molding machine with heat recovery function according to claim 2, characterized in that: The waste heat recovery mechanism (11) comprises a first water suction pump (111), which is installed on the top of the storage tank (7); the water inlet of the first water suction pump (111) penetrates the waste heat recovery area (10) in the storage tank (7) through a first connecting pipe (112); the water outlet of the first water suction pump (111) is connected to a heat exchanger (114) through a second connecting pipe (113); the water outlet of the heat exchanger (114) is connected to a heat conduction pipe (115); one end of the heat conduction pipe (115) is connected to the water inlet of the preheating pipe (12).

4. The energy-saving injection molding machine with heat recovery function according to claim 3, characterized in that: The cooling mechanism (15) comprises a second water suction pump (151), which is installed on the workbench (1). The water inlet of the second water suction pump (151) is connected to a first refrigeration pipe (152), one end of the first refrigeration pipe (152) is connected to a refrigeration area (9) in the reserve tank (7), and the water outlet of the second water suction pump (151) is connected to a movable mold (3) of the injection mold assembly (201) through a second refrigeration pipe (153). A cavity is provided in the movable mold (3) for cooling water to circulate in the movable mold (3), thereby cooling the injected material. The water outlet of the movable mold (3) is connected to a recovery pipe (154), and one end of the recovery pipe (154) is connected to a waste heat recovery area (10) of the reserve tank (7).

5. The energy-saving injection molding machine with heat recovery function according to claim 4, characterized in that: The refrigeration mechanism (14) comprises a refrigerator (141), which is installed on the top of the injection mold (201) and is symmetrical with the position of the heat exchanger (114). The water inlet of the refrigerator (141) is connected to a return pipe (142), one end of the return pipe (142) is connected to the water outlet of the preheating pipe (12), and the other end of the refrigerator (141) is connected to a delivery pipe (143), one end of the delivery pipe (143) passes through the refrigeration area (9) of the reserve tank (7).

6. The energy-saving injection molding machine with heat recovery function according to claim 5, characterized in that: A temperature sensor (16) is installed on the top of the storage tank (7), and a detection end of the temperature sensor (16) is located in the waste heat recovery area (10) inside the storage tank (7).

7. The energy-saving injection molding machine with heat recovery function according to claim 6, characterized in that: The inner cavity of the storage box (7) is installed with a filter screen (17), and the filter screen (17) is arranged in the refrigeration area (9) in the storage box (7) and is fixed to the water outlet position of the delivery pipe (143).

8. The energy-saving injection molding machine with heat recovery function according to claim 7, characterized in that: A first control valve (18) is installed on the heat conduction pipe (115), and a second control valve (19) is installed on the return pipe (142).

9. The energy-saving injection molding machine with heat recovery function according to claim 8, characterized in that: The outer sides of the preheating tube (12) and the heater (13) are sleeved with a protective shell (20), and the surface of the heat conducting tube (115) is sleeved with heat insulation cotton (21).

10. A method for using an energy-saving injection molding machine, according to the energy-saving injection molding machine with heat recovery function according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: By providing a partition (8), the reserve tank (7) is divided into a refrigeration area (9) and a waste heat recovery area (10) for storing cooling water and recovered hot water, so that the cooling water can be transported to the mold cavity of the movable mold (3) through the cooling mechanism (15) to cool the injection material, thereby accelerating the molding speed of the injection material, and then the generated heat is absorbed by the cooling water and recovered to the waste heat recovery area (10) in the reserve tank (7); Step 2: The recovered cooling water with heat can be transported to the preheating pipe (12) through the waste heat recovery mechanism (11). During the transportation process, the heat in the cooling water is collected by the waste heat recovery mechanism (11) according to the monitoring of the temperature sensor (16) and transported to the inside of the preheating pipe (12). The position of the feeding barrel (5) can be preheated, which saves the heating time of the heater (13) for the feeding barrel (5). The heat generated by the injection molding machine body (2) can be recycled and utilized, thereby improving the energy saving effect of the injection molding machine body (2); Step three: The cooling water in the preheating tube (12) can be recycled to the cooling area (9) of the reserve tank (7) through the provided refrigeration mechanism (14). During the transportation process, the cooling water can be cooled again by the refrigeration mechanism (14), thereby improving the recycling rate of the cooling water and saving the amount of cooling water used by the injection molding machine body (2), thereby further improving the environmental protection and energy-saving effect of the injection molding machine body (2).

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