CN112519103A

CN112519103A - Injection molding machine heat energy recycling method and system

Info

Publication number: CN112519103A
Application number: CN201910885436.6A
Authority: CN
Inventors: 石华山
Original assignee: Oped Servo Motor Energy Saving System Co ltd
Current assignee: Oped Servo Motor Energy Saving System Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2021-03-19

Abstract

The invention discloses a method and a system for recycling heat energy of an injection molding machine, wherein the method comprises the following steps: the method comprises the steps that when cooling treatment is carried out on an injection molding machine, cooling liquid is used for absorbing heat generated by injection molding operation of the injection molding machine to obtain high-temperature cooling liquid, and plastic particles to be subjected to injection molding are subjected to pre-treatment; and cooling the cooling liquid after the plastic particles are subjected to the pre-heating treatment, and cooling the injection molding machine again by using the cooling liquid after the cooling treatment, thereby obtaining the high-temperature cooling liquid for pre-treating the plastic particles to be sent into the injection molding machine again.

Description

Injection molding machine heat energy recycling method and system

Technical Field

The invention relates to an injection molding machine, in particular to a method and a system for recycling heat energy of the injection molding machine.

Background

The existing plastic products are usually formed by injection molding machine and mold, and the forming process comprises mold closing, filling, pressure maintaining, cooling, mold opening, demolding and the like. In the cooling process, the technical means adopted is that a water inlet, a cooling water path and a water outlet are arranged on the die. When the formed product needs to be cooled, water enters the cooling water channel of the mold from the water inlet to cool the product, and the cooled water is discharged through the water outlet. And the discharged water is cooled by the cooling tower and then conducted to a water inlet of the mold for cyclic utilization.

In addition, the injection molding machine utilizes the hydraulic oil in the oil hydraulic cylinder to carry out energy transfer, and heat is generated in the using process.

In the cooling process of the prior art, water is directly circulated to a cooling tower for cooling after being discharged from a water outlet of a mold, and the following problems exist:

1. the water discharged from the mold has certain heat, and the water is directly cooled to cause heat waste;

2. the temperature of water discharged from the mold is higher than the ambient temperature, and the energy consumption for cooling the mold is higher;

3. the injection molding machine cannot utilize the heat of the hydraulic oil in the oil hydraulic cylinder.

Disclosure of Invention

The invention aims to provide a method and a system for recycling heat energy of an injection molding machine, so as to recycle the heat energy of the injection molding machine.

According to a first aspect of the present invention, there is provided a method for recycling heat energy of an injection molding machine, comprising:

the method comprises the steps that when cooling treatment is carried out on an injection molding machine, cooling liquid is used for absorbing heat generated by injection molding operation of the injection molding machine to obtain high-temperature cooling liquid, and plastic particles to be subjected to injection molding are subjected to pre-treatment;

cooling the cooling liquid after the plastic particles are subjected to the pre-heating treatment, and cooling the injection molding machine again by using the cooling liquid after the cooling treatment, so as to obtain the high-temperature cooling liquid for pre-treating the plastic particles to be sent into the injection molding machine again;

wherein the high temperature is a temperature higher than 40 ℃ and lower than or equal to 100 ℃.

In one embodiment of the present invention, the cooling liquid is used for cooling the injection molding machine to absorb heat generated by injection molding operation of the injection molding machine to obtain high temperature cooling liquid, and the pre-treatment of the plastic granules to be subjected to injection molding comprises one or a combination of the following steps:

introducing first high-temperature cooling liquid obtained by cooling plastic parts in a mold cavity of an injection molding machine into a feeding preheating device, and preheating plastic particles to be fed into a material drying machine of the injection molding machine;

and introducing a second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the injection molding machine into the feeding preheating device, and preheating plastic particles to be fed into the material drying machine of the injection molding machine.

In another embodiment of the present invention, the cooling liquid is used for cooling the injection molding machine to absorb heat generated by injection molding operation of the injection molding machine to obtain high temperature cooling liquid, and the pre-treatment of the plastic granules to be subjected to injection molding comprises one or a combination of the following steps:

introducing a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of an injection molding machine into a discharge preheating device, and preheating plastic particles from a hydraulic cylinder for pressurizing the plastic particles;

and introducing a second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the injection molding machine into a discharge preheating device, and preheating the plastic particles from a hydraulic cylinder for pressurizing the plastic particles.

In another embodiment of the present invention, the cooling process of the injection molding machine by using the cooling liquid includes absorbing heat generated by the injection molding operation of the injection molding machine to obtain a high temperature cooling liquid, and the pre-treating the plastic granules to be subjected to injection molding includes:

feeding a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of an injection molding machine and a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine into an electric selector valve;

the electric selection valve introduces the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into a discharging preheating device, and performs preheating treatment on plastic particles from a hydraulic cylinder for pressurizing the plastic particles; and

and the electric selection valve introduces the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the feeding preheating device to preheat the plastic particles to be fed into the material drying machine of the injection molding machine.

In another embodiment of the present invention, the cooling liquid is used for cooling the injection molding machine to absorb heat generated by injection molding operation of the injection molding machine to obtain high temperature cooling liquid, and the pre-treating of the plastic granules to be subjected to injection molding comprises one of the following steps:

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a feeding pre-heating device of a second injection molding machine, and carrying out pre-heating treatment on plastic particles to be fed into a drying machine of the second injection molding machine;

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharging preheating device of a second injection molding machine, and carrying out preheating treatment on plastic particles from a hydraulic cylinder for pressurizing the plastic particles of the second injection molding machine);

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and a highest-temperature high-temperature cooling liquid in a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharging pre-heating device of a second injection molding machine; and sending the high-temperature cooling liquid with the lowest temperature in the first high-temperature cooling liquid obtained by cooling the plastic part in the mold cavity of the first injection molding machine and the second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the first injection molding machine into a feeding pre-heating device of a second injection molding machine.

Preferably, a first high-temperature cooling liquid obtained by cooling the plastic part in the mold cavity of the first injection molding machine and a second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the first injection molding machine are combined and then sent into a discharge preheating device of the second injection molding machine, and plastic particles from a hydraulic cylinder for pressurizing the plastic particles are preheated;

and sending the high-temperature cooling liquid from the discharge heating device into a feeding preheating device of a second injection molding machine, and preheating plastic particles to be fed into a material drying machine of the injection molding machine.

Preferably, the feed preheating device comprises: the material drying machine comprises a hopper, a material conveying device, a material drying machine and a material conveying device, wherein plastic particles to enter the material drying machine from a raw material supply device are arranged in the hopper; the hopper flow guide pipe is tightly attached to the outer side wall of the hopper and used for preheating the plastic particles in the hopper by using high-temperature cooling liquid flowing through the hopper flow guide pipe; the hopper water inlet pipe is connected with one end of the hopper flow guide pipe and used for receiving the high-temperature cooling liquid; and the hopper water outlet pipe is connected with the other end of the hopper flow guide pipe.

Preferably, the feed preheating device further comprises: the material suction pipe is arranged between the hopper inlet and the raw material supply device; and the suction motor is connected with the inlet of the hopper and is used for sucking the plastic particles in the raw material supply device into the hopper through the suction pipe. The material suction pipe comprises: the material suction inner pipe is arranged between the hopper inlet and the raw material supply device; and the material suction pipe guide pipe is wrapped outside the material suction inner pipe and is used for preheating the plastic particles by using high-temperature cooling liquid flowing through the material suction pipe guide pipe. One end of the material suction pipe guide pipe is connected with the hopper water outlet pipe, and the other end of the material suction pipe guide pipe is connected with a cooling device used for cooling the cooling liquid through a water outlet of the material suction pipe guide pipe.

Preferably, the outfeed preheating device comprises: a charging barrel connected between a hydraulic cylinder for pressurizing plastic particles and a spiral nozzle for melting and pressurizing the plastic particles; the cylinder guide pipe is tightly attached to the shell of the cylinder and is used for preheating the plastic particles by using the high-temperature cooling liquid flowing through the cylinder guide pipe; the feed cylinder honeycomb duct is a spiral honeycomb duct, include: a water inlet pipe for receiving the high-temperature cooling liquid; and a water discharge pipe for introducing the high-temperature cooling liquid flowing through the draft tube of the charging barrel into the cooling device.

Preferably, a temperature sensor for detecting the temperature of the first high-temperature coolant and the temperature of the second high-temperature coolant is arranged in the electric selector valve, and when the temperature sensor detects that the temperature of the first high-temperature coolant is higher than that of the second high-temperature coolant, the electric selector valve introduces the first high-temperature coolant into the discharge preheating device and introduces the second high-temperature coolant into the feed preheating device; when the temperature sensor detects that the temperature of the second high-temperature cooling liquid is higher than that of the first high-temperature cooling liquid, the electric selection valve introduces the second high-temperature cooling liquid into the discharging preheating device, and introduces the first high-temperature cooling liquid into the feeding preheating device.

According to a second aspect of the present invention, there is provided an injection molding machine heat energy recycling system, comprising:

the heat energy recycling equipment is used for absorbing heat generated by injection molding operation of the injection molding machine by using the cooling liquid when the injection molding machine is cooled to obtain high-temperature cooling liquid, and pre-treating plastic particles to be subjected to injection molding;

the heat energy recycling and circulating equipment is used for cooling the cooling liquid after the plastic particles are subjected to the pre-heating treatment, and cooling the injection molding machine again by using the cooling liquid after the cooling treatment, so that the high-temperature cooling liquid for pre-treating the plastic particles to be sent into the injection molding machine is obtained again;

In one embodiment of the present invention, the thermal energy recovery and utilization apparatus includes:

and the feeding preheating device is used for receiving first high-temperature cooling liquid obtained by cooling plastic parts in a mold cavity of the injection molding machine and/or receiving second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, and preheating plastic particles to be fed into the drying machine of the injection molding machine.

In another embodiment of the present invention, the thermal energy recovery and utilization apparatus includes:

and the discharging preheating device is used for receiving first high-temperature cooling liquid obtained by cooling plastic parts in a mold cavity of the injection molding machine and/or receiving second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, and preheating the plastic particles from the hydraulic cylinder for pressurizing the plastic particles by using the first high-temperature cooling liquid and/or the second high-temperature cooling liquid.

In still another embodiment of the present invention, the thermal energy recovery and utilization apparatus includes:

the electric selection valve is used for receiving a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of the injection molding machine and a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, sending the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the discharging preheating device, and sending the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the feeding preheating device;

the discharge preheating device is used for preheating plastic particles from a hydraulic cylinder for pressurizing the plastic particles by using the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid which are sent by the electric selection valve;

and the feeding preheating device is used for preheating plastic particles to be fed into the injection molding machine material drying machine by using the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid fed by the electric selection valve.

the first injection molding machine heat energy acquisition device is used for acquiring first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of the first injection molding machine and second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine;

and the discharge preheating device of the second injection molding machine is used for preheating the plastic particles from the hydraulic cylinder for pressurizing the plastic particles by using the first high-temperature cooling liquid and/or the second high-temperature cooling liquid from the first injection molding machine.

Preferably, the thermal energy recovery and utilization apparatus further includes: and the feeding preheating device of the second injection molding machine is used for preheating the plastic particles to be fed into the material drying machine of the injection molding machine by using the high-temperature cooling liquid from the discharging preheating device of the second injection molding machine.

Preferably, the feed preheating device further comprises: the material suction pipe is arranged between the hopper inlet and the raw material supply device; the suction motor is connected with the inlet of the hopper and is used for sucking the plastic particles in the feeding raw material supply device into the hopper through the suction pipe; the material suction pipe comprises: the material suction inner pipe is arranged between the hopper inlet and the raw material supply device; and the material suction pipe guide pipe is wrapped outside the material suction inner pipe and is used for preheating the plastic particles by using high-temperature cooling liquid flowing through the material suction pipe guide pipe.

One end of the material suction pipe guide pipe is connected with the hopper water outlet pipe, and the other end of the material suction pipe guide pipe is connected with a cooling device used for cooling the cooling liquid through a water outlet of the material suction pipe guide pipe.

Preferably, the outfeed preheating device comprises: a charging barrel connected between a hydraulic cylinder for pressurizing plastic particles and a spiral nozzle for melting and pressurizing the plastic particles; and the cylinder guide pipe is tightly attached to the shell of the cylinder and is used for preheating the plastic particles by using the high-temperature cooling liquid flowing through the cylinder guide pipe. The feed cylinder honeycomb duct is a spiral honeycomb duct, include: a water inlet pipe for receiving the high-temperature cooling liquid; and a water discharge pipe for introducing the high-temperature cooling liquid flowing through the draft tube of the charging barrel into the cooling device.

Compared with the prior art, the plastic particle preheating device has the beneficial technical effects that the plastic particles are preheated by using the high-temperature cooling liquid obtained in the process of cooling the mold cavity of the injection molding machine and the hydraulic oil, so that the heat utilization and energy-saving effects are improved.

In addition, the invention can also form a system by a plurality of injection molding machines of different types of plastics. For example, because the melting point of the PPSU is high and reaches 380 ℃, the temperature of cooling water passing through a PPSU injection molding machine die is high, the cooling water is directly conveyed to an injection molding machine made of plastic with a low melting point for heating, and the utilization rate of waste water heat is improved.

Drawings

FIG. 1 is a schematic view of a first embodiment of the heat energy recycling system of the injection molding machine of the present invention;

FIG. 2 is a schematic cross-sectional view of a feed preheater according to the present invention;

FIG. 3 is a schematic view of an exploded structure of the feed preheater of the present invention;

FIG. 4 is a schematic structural view of a material suction pipe of the feeding preheating device of the invention;

FIG. 5 is a schematic view of the construction of the heat exchange device of the present invention;

FIG. 6 is a schematic view of a second embodiment of the heat energy recovery system of the injection molding machine of the present invention;

FIG. 7 is a schematic structural view of the discharge preheating apparatus of the present invention;

FIG. 8 is a schematic cross-sectional view of an outfeed preheater unit according to the present invention;

FIG. 9 is an exploded schematic view of the discharge preheater of the present invention;

FIG. 10 is a schematic view of a third embodiment of the heat energy recovery system of the injection molding machine of the present invention;

FIG. 11 is a schematic view of a fourth embodiment of the heat energy recovery system of the injection molding machine of the present invention;

FIG. 12 is a schematic diagram of the injection molding machine heat energy recycling method of the present invention.

Description of reference numerals: 1-injection molding machine body; 2-a mould; 2.1-water outlet of the mould; 2.2-water inlet of mould; 3-a preheating device; 3.1-hopper draft tube; 3.2-hopper inlet pipe; 3.3-hopper drain pipe; 3.4-a blanking outlet; 3.5-a first housing; 3.6-a second housing; 3.7-hopper cover; 3.8-hopper; 3.9-suction motor; 4-a raw material supply device; 5-a water cooling tower; 6-drying the material machine; 7-a flow guide pipe; 8-a material suction pipe; 8.1-material suction inner pipe; 8.2-suction pipe diversion pipe; 8.3-water inlet of material guide pipe of material suction pipe; 8.4-water outlet of material guide pipe of material suction pipe; 8.5-heat preservation gummed paper; 9-a material sucking motor; 10-heat exchange means; 10.1-hot fluid inlet; 10.2-hot fluid outlet; 10.3-coolant inlet; 10.4-coolant outlet; 10.5-coolant flow channel; 10.6-baffle plate; 10.7-heat exchange chamber; 11-a water pump; 12-a second injection molding machine; 13-an electrically operated selector valve; 31-barrel preheating device; 14-hydraulic cylinders for isolated pressurization of the plastic; 15 a spiral spray rod for melting plastic particles and spraying the melted plastic particles; 16-a mold opening and closing moving device; 17-injection molding machine body.

Detailed Description

Fig. 12 shows a method for recycling heat energy of an injection molding machine according to the present invention, which comprises: the method comprises the steps that when cooling treatment is carried out on an injection molding machine, cooling liquid is used for absorbing heat generated by injection molding operation of the injection molding machine to obtain high-temperature cooling liquid, and plastic particles to be subjected to injection molding are subjected to pre-treatment; cooling the cooling liquid after the plastic particles are subjected to the pre-heating treatment, and cooling the injection molding machine again by using the cooling liquid after the cooling treatment, so as to obtain the high-temperature cooling liquid for pre-treating the plastic particles to be sent into the injection molding machine again; wherein the high temperature is a temperature higher than 40 ℃ and lower than or equal to 100 ℃.

In the first embodiment of the present invention shown in fig. 1, when the injection molding machine is cooled by the cooling liquid, the cooling liquid absorbs the heat generated by the injection molding operation of the injection molding machine to obtain the high-temperature cooling liquid, and the pre-treatment of the plastic granules to be subjected to injection molding comprises one or a combination of the following steps:

introducing a first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of a mold 2 of the injection molding machine into a feeding preheating device 3, and preheating plastic particles to be fed into a material drying machine 6 of the injection molding machine;

and introducing second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine into the feeding preheating device 3, and preheating plastic particles to be fed into the material drying machine of the injection molding machine.

In the second embodiment of the present invention shown in fig. 6, the cooling liquid is used to cool the injection molding machine and absorb the heat generated by the injection molding operation of the injection molding machine to obtain the high-temperature cooling liquid, and the pre-treatment of the plastic granules to be subjected to injection molding comprises one or a combination of the following steps:

introducing a first high temperature coolant obtained by cooling plastic parts in a cavity of a mold 2 of the injection molding machine into a discharge preheating device 31, and preheating plastic particles from a hydraulic cylinder 14 for pressurizing the plastic particles;

a second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the injection molding machine is introduced into the discharge preheating device 31, and the plastic granules from the hydraulic cylinder 14 for pressurizing the plastic granules are subjected to preheating treatment.

In a third embodiment of the present invention shown in fig. 10, when cooling the injection molding machine with the cooling liquid, the cooling liquid absorbs heat generated by the injection molding operation of the injection molding machine to obtain a high-temperature cooling liquid, and the pre-treating the plastic granules to be subjected to injection molding comprises:

feeding a first high-temperature cooling liquid obtained by cooling a plastic part in a cavity of a mold 2 of the injection molding machine and a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine into an electric selector valve 13;

the electric selection valve introduces the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into a discharge preheating device 31, and performs preheating treatment on the plastic particles from the hydraulic cylinder 14 for pressurizing the plastic particles; and

and the electric selection valve introduces the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the feeding preheating device 3, and preheating plastic particles to be fed into the drying machine of the injection molding machine.

In the fourth embodiment of the present invention, when the cooling liquid is used to cool the first injection molding machine, the cooling liquid absorbs the heat generated by the injection molding operation of the injection molding machine to obtain the high-temperature cooling liquid, and the plastic particles to be injection molded by the second injection molding machine are preheated, it can be understood that the preheating treatment also includes one of the three preheating treatment modes of the first to third embodiments, that is:

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a feeding preheating device 3 of a second injection molding machine, and preheating plastic particles to be fed into a material drying machine of the second injection molding machine;

the first high-temperature cooling liquid obtained by cooling the plastic parts in the mold cavity of the first injection molding machine and/or the second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the first injection molding machine are fed into a discharge preheating device 31 of the second injection molding machine in a combined manner, and the plastic particles of a hydraulic cylinder 14 for pressurizing the plastic particles from the second injection molding machine are preheated;

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and a highest-temperature high-temperature cooling liquid in a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharging preheating device 31 of a second injection molding machine; and sending the high-temperature cooling liquid with the lowest temperature in the first high-temperature cooling liquid obtained by cooling the plastic parts in the mold cavity of the first injection molding machine and the second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the first injection molding machine into a feeding preheating device 3 of the second injection molding machine.

In a fourth embodiment of the present invention shown in fig. 11, the cooling treatment of the first injection molding machine by the cooling liquid absorbs heat generated by the injection molding operation of the injection molding machine to obtain a high-temperature cooling liquid, and the preheating treatment of the plastic granules to be injected by the second injection molding machine comprises:

feeding a first high-temperature cooling liquid obtained by cooling plastic parts in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharge preheating device 31 of a second injection molding machine 12, and preheating plastic particles of a hydraulic cylinder 14 for pressurizing the plastic particles from the second injection molding machine; and (3) sending the high-temperature cooling liquid from a discharge preheating device (31) of the second injection molding machine into a feeding preheating device (3) to preheat the plastic particles to be fed into the material drying machine of the injection molding machine.

Referring to fig. 2 and 3, a feed preheater 3 suitable for use in the above-described method of the present invention comprises:

a hopper 3.8 in which plastic granules from a raw material supply device to be fed into the dryer are placed;

the hopper draft tube 3.1 is tightly attached to the outer side wall of the hopper 3.8 and used for preheating the plastic particles in the hopper 3.8 by using high-temperature cooling liquid flowing through the hopper draft tube 3.1;

a hopper water inlet pipe 3.2 connected with one end of the hopper draft tube 3.1 and used for receiving the high-temperature cooling liquid;

and a hopper water outlet pipe 3.3 connected with the other end of the hopper draft tube 3.1.

The feed preheating device 3 further includes: a material suction pipe 8 arranged between the inlet of the hopper 3.8 and the raw material supply device 4; and a suction motor 3.9 connected with an inlet of the hopper 3.8 and used for sucking the plastic particles in the feeding raw material supply device into the hopper 3.8 through the suction pipe 8.

Referring to fig. 4, the suction pipe 8 includes: a material suction inner pipe 8.1 arranged between the inlet of the hopper 3.8 and the raw material supply device 4; and the material suction pipe guide pipe 8.2 is wrapped outside the material suction inner pipe 8.1 and is used for preheating the plastic particles by using high-temperature cooling liquid flowing through the material suction pipe guide pipe 8.2.

One end of the material suction pipe guide pipe 8.2 is connected with the hopper water outlet pipe 3.3, and the other end of the material suction pipe guide pipe 8.2 is connected with a cooling device used for cooling the cooling liquid through a water outlet 8.4 of the material suction pipe guide pipe.

Referring to fig. 7-9, a discharge preheating apparatus (31) suitable for use in the above-described method of the present invention comprises:

a barrel 31.1 connected between the hydraulic cylinder 14 for pressurizing the plastic granules and the spiral nozzle 15 for melting and pressure-spraying the plastic granules; a cylinder flow guide 31.2 which is arranged close to the shell of the cylinder 31.1 is used for preheating the plastic particles by using the high-temperature cooling liquid flowing through the cylinder flow guide 31.2.

Feed cylinder honeycomb duct 31.2 is a spiral honeycomb duct, includes: an inlet pipe 31.2.2 for receiving the high temperature coolant; a water outlet pipe 31.2.1 for leading the high-temperature cooling liquid flowing through the cylinder draft tube 31.2 to the cooling device.

The second high-temperature coolant of the present invention, which is obtained by cooling hydraulic oil with heat of an injection molding machine, is realized by a heat exchange device 10 shown in fig. 5, the heat exchange device 10 comprising:

the heat exchanging device 10 includes: a hot fluid inlet 10.1 for introducing hydraulic oil to be heated; a hot fluid outlet 10.2 for leading out the cooled hydraulic oil; a coolant inlet 10.3; a coolant outlet 10.4 and a heat exchange chamber 10.7. In the heat exchange chamber 10.7 there are coolant flow channels 10.5 and baffles 10.6 for increasing the contact time of the coolant with the hot fluid. The heat cooling device 10 is used for recycling heat of hydraulic oil of the injection molding machine, the working process is that the hydraulic oil with heat enters through a hot fluid inlet 10.1, meanwhile, cooling liquid enters through a cooling liquid inlet 10.3, the cooling liquid and the hydraulic oil with heat contact in a heat exchange cavity 10.7, and after heat exchange is completed, the second high-temperature cooling liquid is obtained.

In addition, the electric selector valve 13 of the present invention is provided with a temperature sensor (not shown in the figure) for detecting a temperature of the first high temperature coolant and a temperature of the second high temperature coolant, and when the temperature sensor detects that the temperature of the first high temperature coolant is higher than the temperature of the second high temperature coolant, the electric selector valve 13 introduces the first high temperature coolant into the discharge preheating device 31 and introduces the second high temperature coolant into the feed preheating device 3; when the temperature sensor detects that the temperature of the second high-temperature coolant is higher than that of the first high-temperature coolant, the electric selector valve 13 introduces the second high-temperature coolant into the discharge preheating device 31 and introduces the first high-temperature coolant into the feed preheating device 3.

The invention also provides a heat energy recycling system of the injection molding machine, which comprises:

In a first embodiment of the present invention shown in fig. 1, a thermal energy recovery utilizing apparatus includes:

and the feeding preheating device 3 is used for receiving first high-temperature cooling liquid obtained by cooling plastic parts in the cavity of the injection molding machine die 2 and/or receiving second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, and preheating plastic particles to be fed into the injection molding machine material drying machine 6.

In a second embodiment of the present invention shown in fig. 6, a thermal energy recovery utilizing apparatus includes:

and the discharging preheating device 31 is used for receiving first high-temperature cooling liquid obtained by cooling the plastic parts in the cavity of the injection molding machine die 2 and/or receiving second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, and preheating the plastic particles from the hydraulic cylinder 14 for pressurizing the plastic particles by using the first high-temperature cooling liquid and/or the second high-temperature cooling liquid.

In a third embodiment of the present invention shown in fig. 10, a thermal energy recovery utilizing apparatus includes:

the electric selector valve 13 is used for receiving a first high-temperature cooling liquid obtained by cooling a plastic part in a cavity of the injection molding machine die 2 and a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, sending the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the discharging preheating device 31, and sending the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the feeding preheating device 3;

the discharge preheating device 31 is used for preheating the plastic particles from the hydraulic cylinder 14 for pressurizing the plastic particles by using the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid sent by the electric selection valve;

and the feeding preheating device 3 is used for preheating plastic particles to be fed into the injection molding machine material drying machine by using the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid fed by the electric selection valve.

In a fourth embodiment of the present invention shown in fig. 11, the thermal energy recovery and utilization apparatus includes:

the first injection molding machine heat energy acquisition device is used for acquiring first high-temperature cooling liquid obtained by cooling the plastic part in the cavity of the first injection molding machine 2 and second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine;

the discharge preheating device 31 of the second injection molding machine preheats the plastic pellets from the hydraulic cylinder 14 for pressurizing the plastic pellets with the first high-temperature coolant and the second high-temperature coolant from the first injection molding machine.

And the feeding preheating device 3 of the second injection molding machine is used for preheating the plastic particles to be fed into the material drying machine of the injection molding machine by using the high-temperature cooling liquid of the discharging preheating device 31 of the second injection molding machine.

The feed preheating device 3 of the present invention is shown in fig. 2 to 4, and comprises:

In addition, the feed preheating device of the present invention further comprises:

a material suction pipe 8 arranged between the inlet of the hopper 3.8 and the raw material supply device 4; and

and the suction motor 3.9 is connected with an inlet of the hopper 3.8 and is used for sucking the plastic particles in the raw material supply device into the hopper 3.8 through the suction pipe 8.

Fig. 4 shows the structure of the suction pipe 8, which includes: a material suction inner pipe 8.1 arranged between the inlet of the hopper 3.8 and the raw material supply device 4; and the material suction pipe guide pipe 8.2 is wrapped outside the material suction inner pipe 8.1 and is used for preheating the plastic particles by using high-temperature cooling liquid flowing through the material suction pipe guide pipe 8.2. One end of a material suction pipe guide pipe 8.2 is connected with the hopper water outlet pipe 3.3, and the other end of the material suction pipe guide pipe 8.2 is connected with a cooling device for cooling treatment of cooling liquid, such as a cooling tower 5, through a water outlet 8.4 of a material suction pipe guide pipe.

Fig. 7-9 show the structure of the discharge preheating device 31 of the present invention, which comprises: a barrel 31.1 connected between the hydraulic cylinder 14 for pressurizing the plastic granules and the spiral nozzle 15 for melting and pressure-spraying the plastic granules; a cylinder flow guide 31.2 which is arranged close to the shell of the cylinder 31.1 is used for preheating the plastic particles by using the high-temperature cooling liquid flowing through the cylinder flow guide 31.2.

Feed cylinder honeycomb duct 31.2 is a spiral honeycomb duct, includes: an inlet pipe 31.2.2 for receiving the high temperature coolant; a water discharge pipe 31.2.1 for introducing the high-temperature cooling liquid flowing through the cylinder draft tube 31.2 into a cooling device (such as a cooling tower 5).

In addition, a temperature sensor for detecting the temperature of the first high-temperature coolant and the temperature of the second high-temperature coolant is arranged in the electric selector valve 13, and when the temperature sensor detects that the temperature of the first high-temperature coolant is higher than that of the second high-temperature coolant, the electric selector valve 13 introduces the first high-temperature coolant into the discharge preheating device 31 and introduces the second high-temperature coolant into the feed preheating device 3; when the temperature sensor detects that the temperature of the second high-temperature coolant is higher than that of the first high-temperature coolant, the electric selector valve 13 introduces the second high-temperature coolant into the discharge preheating device 31 and introduces the first high-temperature coolant into the feed preheating device 3.

The present invention will be described in detail with reference to fig. 1 to 11.

Fig. 1 shows a first embodiment of the heat energy recycling system of the injection molding machine of the present invention, which comprises an injection molding machine main body 1, a mold 2 of the injection molding machine, a water cooling tower 5, a preheating device 3 arranged between a raw material supply device 4 and a material drying machine 6, and a heat exchanger 10 arranged on a hydraulic oil pipeline with heat of a hydraulic cylinder of the injection molding machine.

The injection molding machine 1 shown in fig. 1 is provided on a machine body 17, and further includes an injection hydraulic cylinder 14 for pressurizing plastic, a screw boom 15, a mold opening and closing movement device 16, and the like, and since these components are components of the existing injection molding machine, the present invention will not be described in detail.

As shown in fig. 2, the preheating device 3 includes a hopper 3.8, a hopper draft tube 3.1 closely attached to the outer side wall of the hopper 3.8, a first housing 3.5 and a second housing 3.6. As shown in fig. 3, the hopper 3.8 is provided with mounting tabs 3.8.1 and mounting holes 3.8.2. The mounting lug 3.8.1 is used for limiting the hopper draft tube 3.1. During assembly, the hopper draft tube 3.1 is sleeved on the hopper 3.8, and then the first shell 3.5 and the second shell 3.6 are fastened on the hopper 3.8 through screws. The preheating device 3 is also provided with a hopper water inlet pipe 3.2 and a hopper water outlet pipe 3.3 which are used for connecting the hopper draft tube 3.1 with the outside.

When the injection molding machine works, firstly, cooling water enters the interior of the mold through the water inlet 2.2 of the mold, plastic parts in the mold cavity are cooled and then discharged through the water outlet 2.1 of the mold, and water with heat is discharged from the water outlet 2.1 of the mold and then flows into the preheating device 3 through the flow guide pipe 7. Then, the water with heat transfers the heat to the hopper cavity through the hopper draft tube 3.1 to preheat the plastic in the hopper. And finally, water discharged through the hopper draft tube 3.1 is guided to the inlet of the die after being cooled in the water cooling tower 5 through the draft tube, so that the effects of recycling and recycling the heat of the cooling water are achieved.

In order to achieve a better heat transfer effect, the hopper 3.8 and the hopper draft tube are made of copper.

Furthermore, the preheating device 3 further comprises a material sucking motor 3.9 and a material sucking pipe 8, and the material sucking motor 3.9 sucks the plastic particles in the raw material supply device 4 into the hopper 3.8 of the preheating device through the material sucking pipe 8 for preheating. Referring to fig. 4, the material suction pipe 8 comprises a material suction inner pipe 8.1, a material suction pipe guide pipe 8.2 is wrapped outside the material suction inner pipe, and heat preservation adhesive paper is wrapped on the outer surface of the material suction pipe guide pipe 8.2. As shown in fig. 1 and 4, the cooling liquid discharged from the drain pipe 3.3 of the hopper of the preheating device enters the guide pipe 8.2 of the suction pipe through the water inlet 8.3 of the guide pipe of the suction pipe, and then further preheats the plastic. The cooling liquid is discharged from a water outlet 8.4 of a material guide pipe of the material suction pipe and guided to a cooling tower for cooling.

As shown in fig. 1, a material drying machine 6 is further arranged between the preheating device 3 and the injection molding machine 1, and after the plastics are preheated by the preheating device 3, the plastics are dried and heated at a constant temperature by the material drying machine 6. Due to the preheating device 3, the plastic particles are preliminarily preheated before entering the material drier 6, which can reduce the energy consumption of the material drier 6.

Referring to fig. 1, the present invention further includes a heat exchange device 10 and a circulation pump 11. Referring to fig. 5, the heat exchange device comprises a hot fluid inlet 10.1, a hot fluid outlet 10.2, a cooling fluid inlet 10.3, a cooling fluid outlet 10.4 and a heat exchange cavity 10.7. In the heat exchange chamber 10.7, the coolant flow channels 10.5 and the baffle plates 10.6 for increasing the contact time of the coolant with the hot fluid are cooled. The heat cooling device 10 is used for recycling heat of hydraulic oil of the injection molding machine, the working process is that the hydraulic oil with heat enters through a hot fluid inlet 10.1, meanwhile, cooling liquid enters through a cooling liquid inlet 10.3, the cooling liquid and the hydraulic oil with heat are contacted in a heat exchange cavity 10.7, and after heat exchange is completed, the cooling liquid discharges the recycled heat through a cooling liquid outlet 10.4 and is converged with the cooling liquid discharged through a mold and then conducted to the preheating device 3.

The specific embodiment is shown in figure 1: taking an injection molding ppsu plastic part as an example, the injection molding temperature of the ppsu is 260-280 ℃. When the injection molding machine works, ppsu plastic particles are heated to a molten state by the injection molding machine 1, and then the ppsu plastic is pushed into a mold by a screw of the injection molding machine to be filled, pressure-maintained and cooled. After the cooling liquid 7 with normal temperature enters the die through the water inlet 2.2 of the die to cool the die, the cooling liquid with heat flows out through the water outlet 2.1 of the die, because the injection temperature of ppsu is higher than 260 ℃, the cooling liquid with heat drained from the water outlet 2.1 of the die can reach 80-100 ℃, meanwhile, after passing through the heat exchanger 10, the cooling liquid at normal temperature takes away the heat of the hydraulic oil of the injection molding machine, the temperature of the cooling liquid exchanged by the cooling exchanger is 40-60 ℃, after passing through the heat exchange device 10, the cooling water with heat is guided to a mold drain pipe through the water pump 11 to be converged, then the plastic is preheated by the preheating device 3, and after passing through the preheating device 3, the cooling liquid with heat is guided to the cooling tower 5 to be cooled to normal temperature and then flows to the mold 2 and the heat exchange device 10 through the guide pipe 7 respectively, so that the heat recovery of the cooling liquid and the recycling of the cooling liquid are realized.

Fig. 6 shows a second embodiment of the heat energy recycling system of the injection molding machine of the present invention, which comprises an injection molding machine 1, a mold 2, a preheating device 31, a material drying machine 6, a water cooling tower 5, a heat exchange device 10, a water pump 11 and a draft tube 7. The preheating device 31 is arranged at the front end of a raw material supply device of the injection molding machine, and preheating of plastics is achieved. Referring to fig. 7 to 9, the preheating device comprises a cylinder 31.1, a cylinder guide pipe 31.2 and a cylinder housing 31.3. The charging barrel guide pipe 31.2 is a spiral guide pipe and is closely arranged on the outer wall surface of the charging barrel 31.1, and the charging barrel guide pipe comprises a water inlet pipe 31.2.2 and a water outlet pipe 31.2.1 which extend out of the shell of the charging barrel. The cartridge housing 31.3 comprises a cartridge first shell 31.3.1 and a cartridge second shell 31.3.2. The cylinder shell 31.3 encloses the cylinder 31.1 and the cylinder nozzle 31.2 in the cylinder shell.

During the specific working process, cooling liquid enters the die through the guide pipe 7 to cool the die, the heat of the die is discharged by the cooling liquid through the die water outlet 2.1, meanwhile, the cooling liquid is guided to the heat exchange device 10 through the guide pipe, the heat of hydraulic oil of the die is recovered by the cooling liquid through the heat exchange device, the cooling liquid is guided to be converged with the cooling liquid with heat discharged through the die water outlet through the water pump 10, and then is guided to the preheating device 31, the plastic in the charging barrel 31.1 is preheated by the cooling liquid with heat, then the plastic is discharged through the preheating device water discharge pipe 31.2.1, and then the plastic is guided to the cooling tower 5 to cool the cooling liquid. The cooling liquid drained from the cooling tower is guided to the water inlet 2.2 of the mold and the heat exchange device 10 through the guide pipe, and the heat of the hydraulic oil of the mold and the injection molding machine is recovered and the cooling liquid is recycled.

Fig. 10 shows a third embodiment of the heat energy recycling system of the injection molding machine according to the present invention, which includes the preheating device 3 of the first embodiment, the cartridge preheating device 31 of the second embodiment, and the electric selector valve 13, when in operation, the heated coolant discharged through the mold water outlet 2.1 and the heated coolant discharged through the coolant outlet 10.4 of the heat exchanger are respectively conducted to the electric selector valve 13, a temperature sensor is provided in the electric selector valve 13, the electric selector valve 13 selects the coolant discharged from the mold and the coolant discharged from the heat exchanger, the coolant with a higher temperature is guided to the cartridge preheating device 31, the coolant with a lower temperature is guided to the preheating device 3, and the coolant discharged through the preheating device 3 and the cartridge preheating device 31 respectively is merged and guided to the cooling tower 5 for cooling. And finally, guiding the cooling liquid to the die and the heat exchange device respectively for heat absorption and recycling.

Fig. 11 shows a fourth embodiment of the heat energy recycling system of the injection molding machine of the present invention, comprising:

a first injection molding machine heat energy obtaining device such as a heat exchanger 10 and a first injection molding machine mold cavity, for obtaining a first high temperature cooling liquid obtained by cooling a plastic part in the first injection molding machine mold 2 cavity and a second high temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine;

a discharge preheating device 31 of the second injection molding machine for preheating the plastic pellets from the hydraulic cylinder 14 for pressurizing the plastic pellets by using the first high-temperature coolant and the second high-temperature coolant from the first injection molding machine; and/or

A feed preheating device 3 of the second injection molding machine for preheating plastic particles to be fed into the dryer of the injection molding machine by using the high-temperature cooling liquid of the discharge preheating device 31 of the second injection molding machine

The fourth embodiment solves the problem of applying heat absorbing the mold of the injection molding machine and the hydraulic oil to another injection molding machine. Since the injection and preheating temperatures of different plastics differ, taking ppsu and pp as examples, see fig. 11, which includes an injection molding machine 1 for injecting ppsu and a second injection molding machine 12 for injecting pp. The temperature of the cooling liquid drained from the water outlet 2.1 of the mould of the ppsu is up to 80 ℃ because the mould of the ppsu is larger, and the second injection moulding machine is used for injection moulding of pp plastic parts, and the drying temperature of the pp plastic parts is 80 ℃. Therefore, the cooling liquid from the first injection molding machine is guided to the preheating device 31 of the second injection molding machine 12 through the guide pipe 7 to perform drying preheating on the plastic particles and to preheat the feed material by using the feed material preheating device 3.

Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.

Claims

1. A method for recycling heat energy of an injection molding machine, comprising (claim 1 is an independent claim summarizing four embodiments of the invention):

the method comprises the steps that when cooling treatment is carried out on an injection molding machine by using cooling liquid, heat generated by injection molding operation of the injection molding machine is absorbed to obtain high-temperature cooling liquid, and preheating treatment is carried out on plastic particles to be subjected to injection molding;

2. The method of claim 1, wherein the cooling liquid is used for cooling the injection molding machine to absorb heat generated by the injection operation of the injection molding machine to obtain high-temperature cooling liquid, and the pre-treating the plastic granules to be subjected to injection molding comprises one or a combination of the following steps:

introducing first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of a mold (2) of the injection molding machine into a feeding preheating device (3), and preheating plastic particles to be fed into a material drying machine (6) of the injection molding machine;

and introducing second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine into the feeding preheating device (3) to preheat plastic particles to be fed into the drying machine of the injection molding machine.

3. The method of claim 1, wherein the cooling liquid is used for cooling the injection molding machine to absorb heat generated by the injection operation of the injection molding machine to obtain high-temperature cooling liquid, and the pre-treating the plastic granules to be subjected to injection molding comprises one or a combination of the following steps:

introducing a first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of a mold (2) of an injection molding machine into a discharge preheating device (31), and preheating plastic particles from a hydraulic cylinder (14) for pressurizing the plastic particles;

a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine is introduced into a discharge preheating device (31) to preheat plastic particles from a hydraulic cylinder (14) for pressurizing the plastic particles.

4. The method of claim 1, wherein the cooling of the injection molding machine with the cooling fluid absorbs heat generated by the injection molding operation of the injection molding machine to obtain a high temperature cooling fluid, and wherein the pre-treating of the plastic pellets to be injection molded comprises:

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a cavity of a mold (2) of the injection molding machine and a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine into an electric selector valve (13);

the electric selection valve introduces the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into a discharge preheating device (31) to preheat plastic particles from a hydraulic cylinder (14) for pressurizing the plastic particles; and

and the electric selection valve introduces the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the feeding preheating device (3) to preheat the plastic particles to be fed into the material drying machine of the injection molding machine.

5. The method of claim 1, wherein the cooling liquid is used to cool the injection molding machine to absorb heat generated by the injection operation of the injection molding machine to obtain a high temperature cooling liquid, and the pre-treating the plastic granules to be injected comprises one of the following steps:

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a feeding pre-heating device (3) of a second injection molding machine, and carrying out pre-heating treatment on plastic particles to be fed into a dryer of the second injection molding machine;

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharge preheating device (31) of a second injection molding machine, and preheating plastic particles of a hydraulic cylinder (14) which pressurizes the plastic particles and is from the second injection molding machine;

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and a highest-temperature high-temperature cooling liquid in a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharging preheating device (31) of a second injection molding machine; and sending the high-temperature cooling liquid with the lowest temperature in the first high-temperature cooling liquid obtained by cooling the plastic part in the mold cavity of the first injection molding machine and the second high-temperature cooling liquid obtained by cooling the hydraulic oil with heat of the first injection molding machine into a feeding pre-heating device (3) of the second injection molding machine.

6. The method of claim 1, wherein the cooling of the injection molding machine with the cooling fluid absorbs heat generated by the injection molding operation of the injection molding machine to obtain a high temperature cooling fluid, and wherein the pre-treating of the plastic pellets to be injection molded comprises:

sending a first high-temperature cooling liquid obtained by cooling a plastic part in a mold cavity of a first injection molding machine and/or a second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine into a discharge preheating device (31) of a second injection molding machine, and preheating plastic particles from a hydraulic cylinder (14) for pressurizing the plastic particles;

and (3) sending the high-temperature cooling liquid from the discharge heating device (31) of the second injection molding machine into a feeding preheating device (3) of the second injection molding machine, and preheating plastic particles to be fed into a material baking machine of the second injection molding machine.

7. A method according to any one of claims 1-6, wherein the feed preheating device (3) comprises:

a hopper (3.8) in which plastic granules from a raw material supply device are to enter the drier;

the hopper draft tube (3.1) is tightly attached to the outer side wall of the hopper (3.8) and is used for preheating the plastic particles in the hopper (3.8) by using high-temperature cooling liquid flowing through the hopper draft tube (3.1);

the hopper water inlet pipe (3.2) is connected with one end of the hopper draft tube (3.1) and is used for receiving the high-temperature cooling liquid;

and the hopper water outlet pipe (3.3) is connected with the other end of the hopper draft tube (3.1).

8. The method according to claim 7, wherein the feed preheating device (3) further comprises:

a material suction pipe (8) arranged between the inlet of the hopper (3.8) and the raw material supply device (4); and

a suction motor (3.9) connected with the inlet of the hopper (3.8) and used for sucking the plastic particles in the raw material supply device into the hopper (3.8) through the suction pipe (8);

wherein the suction pipe (8) comprises:

a material suction inner pipe (8.1) is arranged between the inlet of the hopper (3.8) and the raw material supply device (4);

and the material suction pipe guide pipe (8.2) is wrapped on the outer side of the material suction inner pipe (8.1) and is used for carrying out preheating treatment on the plastic particles by utilizing high-temperature cooling liquid flowing through the material suction pipe guide pipe (8.2).

One end of the material suction pipe guide pipe 8.2 is connected with the hopper water outlet pipe (3.3), and the other end of the material suction pipe guide pipe (8.2) is connected with a cooling device for cooling the cooling liquid through a water outlet (8.4) of the material suction pipe guide pipe.

9. The method according to any one of claims 1-6, wherein the outfeed preheating device (31) comprises:

a barrel (31.1) connected between a hydraulic cylinder (14) for pressurizing the plastic granules and a spiral nozzle (15) for melting and pressure-spraying the plastic granules;

a cylinder guide pipe (31.2) which is tightly attached to the shell of the cylinder (31.1) and is used for preheating the plastic particles by using high-temperature cooling liquid flowing through the cylinder guide pipe (31.2);

feed cylinder honeycomb duct (31.2) are a spiral honeycomb duct, include:

a water inlet pipe (31.2.2) for receiving the high temperature coolant;

a water discharge pipe (31.2.1) for introducing the high-temperature cooling liquid flowing through the cylinder draft tube (31.2) into the cooling device.

10. The method according to claim 4, wherein a temperature sensor for detecting a first high temperature coolant temperature and a second high temperature coolant temperature is arranged in the electric selector valve (13), and when the temperature sensor detects that the first high temperature coolant temperature is higher than the second high temperature coolant temperature, the electric selector valve (13) introduces the first high temperature coolant into the discharge preheating device (31) and introduces the second high temperature coolant into the feed preheating device (3); when the temperature sensor detects that the temperature of the second high-temperature cooling liquid is higher than that of the first high-temperature cooling liquid, the electric selector valve (13) introduces the second high-temperature cooling liquid into the discharging preheating device (31) and introduces the first high-temperature cooling liquid into the feeding preheating device (3).

11. A heat energy recycling system of an injection molding machine comprises:

12. The system of claim 11, wherein the thermal energy recovery and utilization device comprises:

and the feeding preheating device (3) is used for receiving first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of the injection molding machine die (2) and/or receiving second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, and preheating plastic particles to be fed into the injection molding machine material drying machine (6).

13. The system of claim 11, wherein the thermal energy recovery and utilization device comprises:

the discharging preheating device (31) is used for receiving first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of a mold (2) of the injection molding machine and/or receiving second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, and preheating the plastic particles from the hydraulic cylinder (14) for pressurizing the plastic particles by using the first high-temperature cooling liquid and/or the second high-temperature cooling liquid.

14. The system of claim 11, wherein the thermal energy recovery and utilization device comprises:

the electric selection valve (13) is used for receiving first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of the injection molding machine die (2) and second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the injection molding machine, sending the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the discharging preheating device (31), and sending the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid into the feeding preheating device (3);

the discharging preheating device (31) is used for preheating plastic particles from a hydraulic cylinder (14) for pressurizing the plastic particles by using the high-temperature cooling liquid with higher temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid which are sent by the electric selection valve;

and the feeding preheating device (3) is used for preheating plastic particles to be fed into the injection molding machine material drying machine by using the high-temperature cooling liquid with lower temperature in the first high-temperature cooling liquid and the second high-temperature cooling liquid fed by the electric selection valve.

15. The system of claim 11, wherein the thermal energy recovery and utilization device comprises:

the first injection molding machine heat energy acquisition device is used for acquiring first high-temperature cooling liquid obtained by cooling plastic parts in a cavity of a first injection molding machine die (2) and second high-temperature cooling liquid obtained by cooling hydraulic oil with heat of the first injection molding machine;

and a discharge preheating device (31) of the second injection molding machine, which is used for preheating the plastic particles from the hydraulic cylinder (14) for pressurizing the plastic particles by using the first high-temperature cooling liquid from the first injection molding machine and/or the second high-temperature cooling liquid from the first injection molding machine.

16. The system of claim 15, wherein the thermal energy recovery and utilization device further comprises:

and the feeding preheating device (3) of the second injection molding machine is used for preheating the plastic particles to be fed into the material baking machine of the injection molding machine by using the high-temperature cooling liquid from the discharging preheating device (31) of the second injection molding machine.

17. A system according to any one of claims 12-16, wherein the feed preheating device (3) comprises:

18. The system of claim 17, wherein the feed preheat device further comprises:

the material suction pipe (8) is arranged between the inlet of the hopper (3.8) and the raw material supply device (14); and

wherein the suction pipe (8) comprises:

19. The system according to any one of claims 12-16, wherein the outfeed preheating device (31) comprises:

feed cylinder honeycomb duct (31.2) are a spiral honeycomb duct, include:

a water inlet pipe (31.2.2) for receiving the high temperature coolant;

20. The system according to claim 14, wherein the electrically operated selector valve (13) is provided with temperature sensors for detecting a first high temperature coolant temperature and a second high temperature coolant temperature, and when the temperature sensors detect that the first high temperature coolant temperature is higher than the second high temperature coolant temperature, the electrically operated selector valve (13) introduces the first high temperature coolant into the discharge preheating device (31) and introduces the second high temperature coolant into the feed preheating device (3); when the temperature sensor detects that the temperature of the second high-temperature cooling liquid is higher than that of the first high-temperature cooling liquid, the electric selector valve (13) introduces the second high-temperature cooling liquid into the discharging preheating device (31) and introduces the first high-temperature cooling liquid into the feeding preheating device (3).