CN203818440U - Waste heat recovery system of injection molding machine - Google Patents

Abstract

The utility model belongs to the technical field ofmechanical equipment, and relates to an injection molding machine, particularly to awaste heat recovery system of the injection molding machine. Thewaste heat recovery system of the injection molding machine comprises a heat collection device, wherein a heating barrel is sleeved with theheat collection device; a waste heat collection pipeline is laid between the heat collection device and the heating barrel, one end of the waste heat collection pipeline is connected with an upper port of a drying barrel through a first pipeline, and the other end is connected with a lower port of the drying barrel through a second pipeline; an air pump is arranged on the first pipeline, and an input end of the air pump is communicated with the upper port of the drying barrel through the first pipeline; a confluence mechanism is arranged between the second pipeline and thelower port of the drying barrel. Thewaste heat recovery system is characterized in that a filter is arranged on the first pipeline located between the air pump and the drying barrel, a blowdown pipe is arranged on the filter, a third pipeline is arranged between an output end of the air pump and the second pipeline, and a valve is arranged on the third pipeline. Thewaste heat recovery system has the advantages as follows: theheat utilization rate is very high, little heat is dissipated, and the heat in the heat collection device can be recovered to the drying barrel to the maximum extent.

Description

Injection molding machine waste heat recovery system

technical field

The utility model belongs to the technical field of mechanical equipment and relates to an injection molding machine, in particular to a waste heat recovery system of the injection molding machine.

Background technique

During the working process of the injection molding machine, while the heating coil is heating the screw barrel, part of the heat is still dissipated directly into the air; the traditional dryer on the upper right uses a heating tube to blow hot air into the barrel through a blower Finally, after drying the plastic pellets, the excess heat is also released into the air. Both will cause energy loss and increase in ambient temperature, low heat utilization rate, relatively high power consumption, and high temperature in the production workshop; there is more dust in the air, and the color materials between injection molding machines are easy to cross-infect, affecting product quality. The air pollution is serious and the working environment is harsh.

In order to improve the existing technology, people have carried out long-term exploration and proposed various solutions. For example, the Chinese patent literature discloses an intelligent environment-friendly waste heat recovery and energy-saving system for drying materials of injection molding machines [Application No.: CN201110287023.1], including heat preservation and heat collection devices, air pumps, solenoid valves, auxiliary heaters, intelligent electric control boxes and filtering The device is characterized in that the heat preservation and heat collection device is matched with the barrel of the injection molding machine, and a waste heat gas delivery pipeline is arranged between the upper opening of the drying material barrel and the barrel of the injection molding machine, and a filter device is arranged on the waste heat gas delivery pipe There is a heating gas transmission pipeline between the heat preservation heat collection device and the lower opening of the drying barrel of the injection molding machine, and a fluid collector is installed at the lower opening of the drying barrel of the injection molding machine. The fluid collector is equipped with a temperature sensor and auxiliary A heater, a waste heat gas delivery branch is connected between the air pump output end of the waste heat gas delivery pipeline and the fluid collector at the lower opening of the injection molding machine drying barrel, and a solenoid valve is arranged on the waste heat gas delivery branch. Both the gas transmission pipeline and the waste heat gas transmission branch are connected to the fluid concentrator, and the temperature sensor, air pump, solenoid valve and auxiliary heater are all connected to the intelligent electric control box, which can control the temperature of each part. The work is running, and its control program is compiled in C language.

Although the above solution solves the deficiencies of the existing technology to a certain extent, the filter device is relatively complicated, and the filtered impurities can only be left in the filter device, which is troublesome to clean. In addition, one end of the waste heat gas delivery branch is installed in the fluid collector In general, a large amount of air flow directly enters the fluid concentrator and is combined with the hot gas transported by the heating gas transmission pipeline. The process takes a short time, and the mixing of the two is insufficient, and there is a local temperature difference, which is not conducive to temperature measurement.

Contents of the invention

The purpose of the utility model is to solve the above problems and provide a waste heat recovery system of an injection molding machine that can recycle waste heat, has a high heat utilization rate and is more environmentally friendly.

In order to achieve the above purpose, the utility model adopts the following technical solutions: the waste heat recovery system of the injection molding machine includes a heat collecting device set on the heating cylinder, and there is a waste heat recovery system between the heat collecting device and the heating cylinder. A collection pipeline, one end of the waste heat collection pipeline is connected to the upper opening of the drying cylinder through the first pipeline, and the other end is connected to the lower opening of the drying cylinder through the second pipeline. The first pipe An air pump is provided on the road, and the input end of the air pump communicates with the upper opening of the drying cylinder through the first pipeline, and a confluence mechanism is provided between the second pipeline and the lower opening of the drying cylinder, which is characterized in that , the first pipeline between the air pump and the drying cylinder is provided with a filter device, the filter device is provided with a sewage pipe, and a third pipeline is provided between the output end of the air pump and the second pipeline. pipeline, the third pipeline is provided with a valve. The main principle of the waste heat recovery system is to convert the waste heat of the heating cylinder of the injection molding machine into the heat energy required for drying the plastic in the drying cylinder. The heat collector collects the heat lost by the heating coil during the heating process of the heating cylinder. Under the action of the air pump, The hot gas in the waste heat collection pipeline is transported to the second pipeline, and then reaches the drying cylinder through the confluence mechanism, and then dehydrates and dries the color material in the drying cylinder, and then enters the first pipeline, and the filter device will dry the The wet and dusty excess hot air from the top of the barrel is recycled after being dehydrated and filtered. During this process, impurities such as water and dust are directly discharged from the sewage pipe, and finally the gas re-enters the waste heat collection pipeline, and so on. In addition, after the valve is opened, part of the gas in the first pipeline flows to the third pipeline, and is fully mixed with the hot gas in the second pipeline before being input into the drying drum.

In the waste heat recovery system of the above-mentioned injection molding machine, a first temperature sensor is provided in the confluence mechanism, and the first temperature sensor is connected to the control mechanism. The first temperature sensor can detect the temperature of the gas in the confluence mechanism.

In the waste heat recovery system of the above-mentioned injection molding machine, the second temperature sensor is provided on the drying cylinder, and the second temperature sensor is connected with the control mechanism. The second temperature sensor can detect the temperature of the gas in the drying barrel.

In the waste heat recovery system of the above-mentioned injection molding machine, an auxiliary heating device is provided in the converging mechanism, and the auxiliary heating device is connected with a control mechanism, and the control mechanism is connected with a valve on the third pipeline. When the heat energy supplied by the heat collecting device is insufficient, the temperature detected by the first temperature sensor or the second temperature sensor is lower than the set temperature, the control mechanism controls the opening of the auxiliary heating device, and at the same time closes the valve of the third pipeline, and the gas quickly The set temperature is reached; when the set temperature is reached, the control mechanism turns off the auxiliary heating device, which minimizes the power consumption time of the auxiliary heating and saves electric energy; when the temperature collected by the heat collecting device is too high, the first The valves of the three pipelines are opened, and the cold air in the third pipeline is combined with the hot air constantly delivered by the heat collector, and the temperature is automatically lowered and adjusted to the set temperature.

In the above waste heat recovery system for injection molding machines, the output end of the third pipeline is connected to the input end or output end of the confluence mechanism. When there is only the first temperature sensor, the output end of the third pipeline is connected to the output end of the confluence mechanism; when there is only the second temperature sensor, the output end of the third pipeline is connected to the input end of the confluence mechanism, which is beneficial for rapid cooling.

In the waste heat recovery system of the injection molding machine described above, the output end of the third pipeline is connected with the input end of the second pipeline. Conducive to the full mixing of cold air and hot air.

In the waste heat recovery system of the above-mentioned injection molding machine, the heat-collecting device is provided with an insulating layer. It has the function of heat preservation and prevents heat loss.

In the waste heat recovery system of the above-mentioned injection molding machine, a display is connected to the control mechanism.

In the waste heat recovery system of the injection molding machine described above, the waste heat collection pipeline includes several independently circumferentially distributed round-trip pipelines on the inner layer of the heat collector, and the input end of the round-trip pipeline passes through the first pipeline branch Connect to the first line. The branch pipe of the first pipeline plays a role in dispersing the gas flow, and the gas circulation efficiency is high.

In the waste heat recovery system of the injection molding machine described above, the output end of the return pipeline is connected to the second pipeline through the second pipeline branch. The branch pipe of the second pipeline plays a role in dispersing the air flow, and the gas circulation efficiency is high.

Compared with the existing technology, the advantages of the waste heat recovery system of the injection molding machine are: 1. Fully enclosed hot air circulation pipeline and short-distance layout design, high heat utilization rate and less external heat dissipation, using one air pump to compress air and The heat collecting device is placed in front, which can recover the heat energy in the heat collecting device to the drying cylinder to the greatest extent. 2. Since the heat transmission basically does not require power consumption, the system can also achieve the effect of heat preservation while collecting heat energy. Compared before and after installation, it saves 35% of the combined power consumption of the heating coil of the heating cylinder and the drying cylinder— 60%. 3. The temperature of the production workshop will be greatly reduced, which will truly solve the problem of high temperature in the workshop and greatly improve the working environment of employees. 4. The filter device is simple, and impurities can be discharged directly through the sewage pipe. It is easy to clean, and can completely filter the dust in the barrel, avoid cross-infection of color materials between injection molding machines, improve injection quality, and effectively prevent air pollution in the production workshop. Protect the health of employees 5. While collecting heat energy, the system can also achieve the effect of heat preservation. When the injection molding machine is turned on, because the system has a heat preservation effect on the barrel, the preheating time of the injection molding machine is greatly shortened.

Description of drawings

Fig. 1 is a structural schematic diagram provided by the utility model.

Fig. 2 is a sectional view of the heat collecting device provided by the utility model.

Fig. 3 is a side view of the heat collecting device provided by the utility model.

Fig. 4 is a structural block diagram provided by the utility model.

In the figure, heating cylinder 1, heat collecting device 2, waste heat collecting pipeline 3, first pipeline 4, drying material cylinder 5, upper port 6, lower port 7, air pump 8, confluence mechanism 9, filter device 10, sewage discharge Pipe 11, third pipeline 12, valve 13, first temperature sensor 14, control mechanism 15, second temperature sensor 16, auxiliary heating device 17, display 18, round-trip pipeline 19, first pipeline branch 20, second Pipeline branch pipe 21, second pipeline 22.

Detailed ways

Example 1

As shown in Figure 1-4, the waste heat recovery system of this injection molding machine includes a heat collector 2 sleeved on the heating cylinder 1, and a waste heat collection pipeline 3 is laid between the heat collector 2 and the heating cylinder 1. One end of the waste heat collection pipeline 3 is connected to the upper port 6 of the drying cylinder 5 through the first pipeline 4, and the other end is connected to the lower opening 7 of the drying cylinder 5 through the second pipeline 22. An air pump 8 is provided, and the input end of the air pump 8 communicates with the upper port 6 of the drying drum 5 through the first pipeline 4, and a converging mechanism is provided between the second pipeline 22 and the lower port 7 of the drying drum 5 9. A filter device 10 is provided on the first pipeline 4 between the air pump 8 and the drying cylinder 5, and a sewage pipe 11 is provided on the filter device 10. Between the output end of the air pump 8 and the second pipeline 22 A third pipeline 12 is provided, and a valve 13 is provided on the third pipeline 12 . The main principle of the waste heat recovery system is to use the waste heat of the heating cylinder 1 of the injection molding machine to convert the heat energy required for drying the plastic in the material drying cylinder 5, and the heat collector 2 collects the heat lost by the heating coil during the heating process of the heating cylinder 1, and transfers it to the air pump Under the action of 8, the hot gas in the waste heat collection pipeline 3 is transported to the second pipeline 22, and reaches the drying cylinder 5 through the confluence mechanism 9, and then dehydrates and dries the color material in the drying cylinder 5, and then enters the To the first pipeline 4, the filter device 10 dehydrates and filters the excess hot air with dust from the upper outlet of the drying cylinder 5, and then recycles it. During this process, impurities such as water and dust are directly discharged from the sewage pipe 11 , and finally the gas re-enters the waste heat collection pipeline 3, and so on. In addition, after the valve 13 is opened, part of the gas in the first pipeline 4 flows to the third pipeline 12 , and is fully mixed with the hot gas in the second pipeline 22 before being input into the drying cylinder 5 .

Wherein, the confluence mechanism 9 is provided with a first temperature sensor 14 , the first temperature sensor 14 is connected with the control mechanism 15 , and the first temperature sensor 14 can detect the temperature of the gas in the confluence mechanism 9 . The drying cylinder 5 is provided with a second temperature sensor 16 , which is connected with the control mechanism 15 , and the second temperature sensor 16 can detect the temperature of the gas in the drying cylinder 5 . An auxiliary heating device 17 is provided in the confluence mechanism 9, and the auxiliary heating device 17 is connected with the control mechanism 15, and the control mechanism 15 is connected with the valve 13 on the third pipeline 12. When the heat energy supplied by the heat collecting device 2 is insufficient, the second The temperature detected by a temperature sensor 14 or the second temperature sensor 16 is lower than the set temperature, the control mechanism 15 controls the opening of the auxiliary heating device 17, and closes the valve 13 of the third pipeline 12 at the same time, and the gas reaches the set temperature soon After reaching the set temperature, the control mechanism 15 closes the auxiliary heating device 17, which shortens the power consumption time of the auxiliary heating to the greatest extent and saves electric energy; when the temperature collected by the heat collecting device 2 is too high, the third tube The valve 13 of the road 12 is opened, and the cold air in the third pipe 12 is collected together with the hot air constantly delivered by the heat collecting device 2, and the temperature is automatically lowered to adjust to the set temperature. The output end of the third pipeline 12 is connected to the input end of the confluence mechanism 9 through the first branch pipe, connected to the output end of the confluence mechanism 9 through the second branch pipe, and connected to the input end of the second pipeline 22 through the third branch pipe, The first branch pipe, the second branch pipe and the third branch pipe are respectively provided with branch pipe valves, and the branch pipe valves are connected with the control mechanism 15 .

As an improvement, the heat collecting device 2 is provided with an insulating layer, which has the function of heat preservation and prevents heat loss. As an improvement, a display 18 is connected to the control mechanism 15 . As an improvement, the waste heat collection pipeline 3 includes several independently circumferentially distributed round-trip pipelines 19 on the inner layer of the heat collector 2, and the input end of the round-trip pipeline 19 communicates with the first pipeline 4 through the first pipeline branch 20. connection, the first pipeline branch pipe 20 plays a role in dispersing the airflow, and the gas circulation efficiency is high. As an improvement, the output end of the back-and-forth pipeline 19 is connected to the second pipeline 22 through the second pipeline branch 21, and the second pipeline branch 21 plays a role in dispersing the gas flow, and the gas circulation efficiency is high.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although this article uses a lot of heating cylinder 1, heat collecting device 2, waste heat collection pipeline 3, first pipeline 4, drying material cylinder 5, upper port 6, lower port 7, air pump 8, confluence mechanism 9, filter Device 10, sewage pipe 11, third pipeline 12, valve 13, first temperature sensor 14, control mechanism 15, second temperature sensor 16, auxiliary heating device 17, display 18, round-trip pipeline 19, first pipeline branch 20. Second pipeline branch pipe 21, second pipeline 22 and other terms, but the possibility of using other terms is not excluded. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (10)

1. A waste heat recovery system for an injection molding machine, comprising a heat collecting device (2) sleeved on the heating cylinder (1), and a paving device (2) is arranged between the heat collecting device (2) and the heating cylinder (1). Waste heat collection pipeline (3), one end of the waste heat collection pipeline (3) is connected to the upper port (6) of the drying cylinder (5) through the first pipeline (4), and the other end is connected through the second pipeline (22) It is connected to the lower port (7) of the drying cylinder (5), the first pipeline (4) is provided with an air pump (8) and the input end of the air pump (8) passes through the first pipe The road (4) communicates with the upper port (6) of the drying cylinder (5), and a confluence mechanism ( 9), it is characterized in that a filter device (10) is provided on the first pipeline (4) between the air pump (8) and the drying cylinder (5), and the filter device (10) is provided with Sewage pipe (11), a third pipeline (12) is provided between the output end of the air pump (8) and the second pipeline (22), and the third pipeline (12) is provided with valve (13). 2. The waste heat recovery system of injection molding machine according to claim 1, characterized in that, the first temperature sensor (14) is arranged in the confluence mechanism (9), and the first temperature sensor (14) is connected with the The control mechanism (15) is connected. 3. The waste heat recovery system of an injection molding machine according to claim 1, characterized in that, the second temperature sensor (16) is provided on the drying barrel (5), and the second temperature sensor (16) Be connected with control mechanism (15). 4. The waste heat recovery system of an injection molding machine according to claim 1, 2 or 3, characterized in that an auxiliary heating device (17) is provided in the confluence mechanism (9), and the auxiliary heating device ( 17) Connect with the control mechanism (15), and the control mechanism (15) is connected with the valve (13) on the third pipeline (12). 5. The waste heat recovery system of injection molding machine according to claim 4, characterized in that, the output end of the third pipeline (12) is connected to the input end or output end of the confluence mechanism (9). 6. The waste heat recovery system of an injection molding machine according to claim 4, characterized in that, the output end of the third pipeline (12) is connected to the input end of the second pipeline (22). 7. The waste heat recovery system of injection molding machine according to claim 5, characterized in that, the heat collecting device (2) is provided with an insulating layer. 8. The waste heat recovery system of an injection molding machine according to claim 7, characterized in that a display (18) is connected to the control mechanism (15). 9. The waste heat recovery system of the injection molding machine according to claim 8, characterized in that, the waste heat collection pipeline (3) includes several independently circumferentially distributed round-trip pipelines ( 19), the input end of the round-trip pipeline (19) is connected to the first pipeline (4) through the first pipeline branch (20). 10. The waste heat recovery system of injection molding machine according to claim 9, characterized in that, the output end of the back and forth pipeline (19) communicates with the second pipeline (22) through the second pipeline branch (21) connect.