KR102485959B1 - System for preventing mold scale in injection process - Google Patents

Abstract

The present invention relates to an injection mold system, which includes an injection mold having a plurality of cooling passages and a cooling circulation unit supplying cooling water to the cooling passages of the injection mold, wherein the cooling circulation unit includes a heater and a temperature sensor. A cooling water tank for storing cooling water and a circulation line connected from the cooling water tank to the cooling passage of the injection mold to circulate, supply and recover cooling water, and a circulation line provided in the front of the cooling water tank to pump the cooling water toward the cooling passage of the injection mold A supply circulation pump and a scale prevention device provided in front of the circulation pump to remove scale from the cooling passage by supplying air to the cooling water flowing into the cooling passage of the injection mold along the circulation line, and the circulation pump and the scale prevention device In the meantime, an ion filter for removing ions that cause scale formation, such as metal ions, in the cooling water supplied to the cooling passage by bypassing to the rear circulation line of the cooling water tank is optionally installed to increase the flow rate by the injected air. The present invention relates to a system for preventing mold scale in an injection process, which can prevent or remove scale from occurring in a cooling passage of an injection mold, and can discharge a large amount of air due to superior air collection performance compared to conventional ones.

Description

System for preventing mold scale in injection process

The present invention relates to an injection mold system, and more specifically, it is possible to prevent or remove scale from the cooling passage of an injection mold by increasing the flow rate by injected air and using cavitation, It relates to a system for preventing mold scale in the injection process, which has excellent air collection performance and can discharge a large amount of air.

In other words, the injection mold device is a device for injection molding by injecting molten resin into the cavity of the injection mold and supplying cooling water through a cooling passage formed in the injection mold to cool the injection product.

In this injection process, since the injection speed and cooling speed of the molten resin are important factors that determine the quality of an injection product, it is very important to properly supply cooling water to each part of the injection mold.

When the cooling water is circulated into the cooling passage formed in the injection mold for a long time, mineral substances such as various metal elements and minerals dissolved in the cooling water are precipitated to form scale, which narrows the cooling passage and makes it difficult to supply sufficient cooling water. In the end, it may cause the defect of the injection product.

Therefore, the cooling passage of the injection mold needs to be descaled periodically.

On the other hand, in the past, scale was removed by flowing cooling water mixed with chemicals having strong acidity into the cooling passage.

However, this scale removal method has a risk of corroding the pipe by chemicals, and since wastewater containing chemicals is generated after scale removal, there is a burden of reprocessing the scale removal method.

Therefore, there is a need to develop a scale removal device capable of more economically and effectively removing scale in the cooling passage of an injection mold.

KR 10-2014-0120207 A

In order to solve the above problems, the present invention applies a venturi tube to an air nozzle to increase the flow rate by the injected air to prevent or remove scale in the cooling passage of the injection mold, and to separate the water in the air chamber. The purpose is to provide a system for preventing mold scale in the injection process that can discharge a large amount of air due to superior air collection performance by applying polling.

In order to achieve the above object, the present invention is an injection mold system including an injection mold having a plurality of cooling passages and a cooling circulation unit for supplying cooling water to the cooling passages of the injection mold, wherein the cooling circulation unit has a heater and a temperature sensor Including a cooling water tank for storing cooling water, a circulation line connected from the cooling water tank to the cooling passage of the injection mold to circulate, supply and recover cooling water, and a circulation line provided in the front circulation line of the cooling water tank to coolant toward the cooling passage of the injection mold A circulation pump for pumping and supplying, a scale prevention device provided in front of the circulation pump and supplying air to the cooling water flowing into the cooling passage of the injection mold along the circulation line to remove scale from the cooling passage, and the circulation pump and scale prevention A separate optional ion filter for removing ions that cause scale formation, such as metal ions, in the cooling water supplied to the cooling passage by bypassing the cooling water tank to the rear circulation line between the devices. Provides a system for preventing mold scale in the injection process.

Here, the scale prevention device includes an air tank for storing high-pressure air supplied from an air compressor provided in the factory, a pressure sensor for detecting high-pressure air pressure, a control valve for controlling the supply of high-pressure air, and circulation It includes an air nozzle connected to the line to supply high-pressure air to the cooling water, and the air compressor, the control valve, and the air nozzle are sequentially configured by pipe connection.

At this time, the air nozzle is hollow and has an installation space formed therein, and a nozzle body having an air injection hole through which high-pressure air of the control valve is introduced through one side of the circumference of the center and fastenings are provided at both ends of the nozzle body, respectively. It is installed in a hollow in the installation space of the pipe cap and the nozzle body connected to the pipe, and a plurality of nozzle holes are formed radially along the circumference, and the venturi effect on the passing coolant; the fluid presses in a part of the pipe It is characterized in that it includes a nozzle pipe body that implements a specific part designed to be limited to deform or a phenomenon in which the fluid pressure decreases when flowing through such a choke (choke-fluid flow control device).

On the other hand, in the circulation line connected to the rear of the cooling passage of the injection mold, an air chamber connected to the circulation line and having an inlet and an outlet through which cooling water flows in and out, and a plurality of air chambers accommodated in the air chamber to supply air contained in the cooling water. It is characterized in that it includes a polling for separation and an air vent (a hole through which air is discharged or introduced for ventilation or cooling) provided on the upper part of the air chamber to discharge air separated from the inside of the air chamber. do.

By providing the present invention configured as described above, the flow rate is increased by the injected air, and the introduced air bubbles and water droplets are mixed to form a turbulent flow and collide with the cooling passage of the injection mold to prevent or remove scale generation. It has excellent air collecting performance compared to the existing ones, so there is an effect of discharging a large amount of air.

1 is a conceptual diagram showing a system for preventing mold scale in an injection process according to the present invention.
Figure 2 is a configuration diagram showing an air nozzle applied to the system for preventing mold scale in the injection process according to the present invention.
Figure 3 is a configuration diagram showing an air chamber applied to the system for preventing mold scale in the injection process according to the present invention.
4 is an exemplary configuration diagram showing polling of an air chamber applied to a system for preventing mold scale in an injection process according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention.

As shown in FIG. 1, the system for preventing mold scale in the injection process of the present invention (hereinafter, the injection mold system) includes an injection mold 100 for injection molding an injection product and cooling formed in the injection mold 100. It may be configured to include a scale prevention device 240 for removing scale from the flow path 110 .

The injection mold 100 includes an upper mold and a lower mold disposed under the upper mold.

That is, the injection mold 100 is provided with a cooling passage 110 for circulating cooling water to adjust the temperature of the mold during the injection molding process, and a scale prevention device 240 for removing scale formed in the cooling passage 110. ) may be connected to the circulation line 220.

Meanwhile, in order to supply cooling water to the cooling passage 110 of the injection mold 100, the cooling circulation unit 200 should be included.

Here, the cooling circulation unit 200 includes a cooling water tank 210, a circulation pump 230, a scale prevention device 240, ions along a circulation line 220 connected to the cooling passage 110 of the injection mold 100. Filters 260 may be sequentially or selectively arranged to circulate and supply cooling water.

The cooling water tank 210 may store cooling water by including a heater 211 and a temperature sensor 213 .

The circulation line 220 is connected from the cooling water tank 210 to the cooling passage 110 of the injection mold 100 to circulate the cooling water to supply and recover it.

The circulation pump 230 is provided in the front circulation line 220 of the cooling water tank 210 to pump and supply cooling water to the cooling passage 110 side of the injection mold 100 .

The scale prevention device 240 is provided in front of the circulation pump 230 and supplies air to the cooling water flowing into the cooling passage 110 of the injection mold 100 along the circulation line 220 so that the cooling passage 110 It can be used to remove scale.

The cooling circulation unit 200 includes a circulation pump 230 for pumping cooling water to circulate the cooling water into the cooling passage 110, and an air nozzle 250 for supplying high-pressure air to the cooling water supplied from the circulation pump 230. ) and compressed air supplied to the air nozzle 250 may be supplied to the plurality of cooling passages 110 and recovered, and then returned to the cooling water tank 210 by the circulation pump 230.

In other words, the scale prevention device 240 includes a pressure sensor 245 for detecting high-pressure air pressure; a control valve 247 for controlling the supply of high-pressure air; An air nozzle 250 connected to the circulation line 220 to supply high-pressure air to the cooling water; Including, it is preferable that the pressure sensor 245, the control valve 247, and the air nozzle 250 are sequentially configured by pipe connection.

In addition, the cooling circulation unit 200 heats the cooling water inside the cooling water tank 210 storing the cooling water circulated to the cooling passage 110 so that the cooling water supplied to the cooling passage 110 can be maintained at a set temperature or higher. 211, an ion filter 260 for removing ions that cause scale formation, such as metal ions, in the cooling water supplied to the cooling passage 110, and an ion filter 260 for controlling air injected from the air nozzle 250 A control valve 247 can be made optional.

The ion filter 260 is bypass-connected to the rear circulation line 220 of the cooling water tank 210 between the circulation pump 230 and the scale prevention device 240, and metal ions are removed from the cooling water supplied to the cooling passage 110. As such, it is possible to remove ions that cause scale formation.

A bypass line 225 is connected between the supply conduit 221 of the circulation pump 230 and the return conduit 223 for recovering the cooling water returned to the cooling water tank 210 after passing through the cooling passage 110, An ion filter 260 may be provided in the bypass line 225 .

Therefore, some of the cooling water supplied through the supply pipe 221 of the circulation pump 230 is returned to the cooling water tank 210 through the bypass line 225, and in this process, the cooling water is filtered by the ion filter 260. ionic components can be removed from

On the other hand, the air nozzle 250 is hollow and has an installation space 253 formed therein, a nozzle body having an air injection hole 252 through which high-pressure air of the control valve 247 is introduced through one side of the central circumference. (251) and; a pipe cap 255 provided at both ends of the nozzle body 251 and connected to a pipe; It is installed hollow in the installation space 253 of the nozzle body 251, and a plurality of nozzle holes 258 are radially penetrated along the circumference, and the nozzle pipe body 257 that implements the Venturi effect on the passing cooling water can be configured to include

It is possible to design by applying two piping specifications per one lineup by changing the orifice to two lineups, and by applying 25A, 32A or 40A, 50A as specifications, each cooling channel (110) of the mold is applied according to design needs. The configuration of 10Φ ~ 12Φ based on the thickness of the fitting hose can also be applied as an option.

Referring to FIG. 2 , when cooling water flows from left to right, the flow rate may increase while passing through the Venturi section.

By injecting fine air generated by passing through a sintering furnace injection product or a pin hole into the cooling water with increased flow rate and mixing, the flow rate increase and turbulence may occur at the same time.

Cooling water containing fine air generated from the nozzle passes through the cooling passage 110 of the mold and hits the inner wall of the cooling passage 110 to prevent and remove scale formation.

The air nozzle 250 can be used for products such as a mold temperature controller using cooling water. The basic product corresponds to the main pipe and is a nozzle for each cooling passage 110 for 10 ~ 1 2Φ fittings in which an orifice and a venturi are integrated. of can be applied.

Of the coolant supplied from the circulation pump 230, the rest of the coolant that has not flowed into the bypass line 225 flows into the air nozzle 250, and at the same time as the coolant flows in, compressed air from the air compressor flows in. The air compressed by the air compressor is stored in the air tank, and as the control valve 247 is opened, it is sent to the air nozzle 250 and flows into the cooling water supplied from the circulation pump 230 to generate fine air in the cooling water. there is.

The air nozzle 250 may be configured in a form in which a nozzle for spraying air is coupled to a pipe through which cooling water flows.

A pressure sensor 245 is installed on the high-pressure air supply side to measure the supply pressure of the air supplied to the air nozzle 250 and provide pressure information to a controller (not shown).

Here, in the case of the nozzle hole 258, it is preferable that the through-form is formed in an inclined direction at an angle of 160 ° based on the reference line intersecting the center of the nozzle tube body 257.

That is, the nozzle hole 258 is formed along the circumference of the nozzle tube body 257 to penetrate in an oblique direction, and the high-pressure air injected into the nozzle tube body 257 through the nozzle hole 258 is a cyclone. While passing through the nozzle tube body 257, the flow rate can be rapidly increased.

According to FIG. 2, the connection relationship between the components of the scale prevention device 240 is shown by the control device (not shown), and the cooling water used to remove the scale of the injection mold 100 is set through the heater 211. The set temperature may be maintained by the heater 211 by preheating to the temperature and providing temperature information measured by the temperature sensor 213 to a control device (not shown).

When the cooling water in the cooling water tank 210 is preheated to the set temperature, the heater 211 is stopped using a control device (not shown) and the circulation pump 230 and the compressed air nozzle 250 are operated to start the scale removal operation. can do.

On the other hand, when the factory compressed air to be supplied drops to an abnormally low pressure, the pressure sensor 245 senses it and informs the compressed air pressure abnormality alarm.

In addition, the amount of air injected into the cooling water can be adjusted through the control valve 247, and when the control valve 247 is opened and closed to a predetermined set value by a control device (not shown), the coolant is discharged through the air nozzle 250. In the process of injecting air into the cooling water, fine air is generated in the cooling water, and the fine air can remove scale formed in the cooling passage 110 along with the cooling water.

In addition, when air is injected into the cooling water by the air nozzle 250, the fine air is mixed with the cooling water, and the flow in the passage changes from laminar flow to turbulent flow, and this turbulent flow plays a role in removing scale in the cooling passage 110. In addition, by reducing the flow resistance in the flow passage, not only induces fast flow in the cooling passage 110, but also maximizes the scale removal effect by generating cavitation in the flow.

Meanwhile, a water separator 270 may be further provided in the circulation line 220 connected to the rear of the cooling passage 110 of the injection mold 100.

That is, in order to reduce the burden, such as impact due to the water hammer phenomenon, in the cooling water circulation line 220 containing the high-pressure air from which the scale is removed along the cooling passage 110, the air separator 270 is installed to discharge the air Should be.

The air separator 270 includes an air chamber 271 and an air vent 275, and accommodates the coolant recovered through the inlet 272 and the outlet 273 of the air chamber 271 to enter the interior. It is possible to divide by the polling 274 provided in .

Here, the air chamber 271 is piped to the circulation line 220, has an inlet 272 and an outlet 273 through which cooling water comes in and out, and has a predetermined space therein to accommodate the cooling water.

At this time, the polling 274 is a circular single pipe, and a plurality of air separation pieces are formed inside the air chamber 271 to separate the air included in the cooling water.

The air vent 275 is provided on the upper part of the air chamber 271 to discharge air separated from the inside of the air chamber 271 .

At this time, the air vent 275 may have a level sensor 276 that opens and closes according to the air pressure level inside the air chamber 271 as an option.

According to FIG. 3, the fine air injected to prevent scale from sticking to the mold cooling passage 110 must be recovered and removed before being introduced into the circulation pump 230 to ensure durability of the circulation pump 230. .

In addition, a separate collection section is provided, and in the internal structure, fine air collides with walls and structures to form large drops, and is collected at the upper end of the collection section. When a certain amount of air is filled, the solenoid valve for venting is opened to open the inside A large flow air vent 275 is basically provided by discharging the collected air until the medium level reaches an appropriate level, so that a small amount of air is always vented to prepare for impact such as a water hammer.

The design of the separator 270 described above may be changed in structure to suit the purpose, and when an air space is created at the upper end, the solenoid valve may be opened by the level sensor 276 to release air.

That is, when the level is low, the solenoid valve is opened to release air, and when the level is high, the electromagnetic valve is closed, and the upper part of the air chamber 271 is opened to maintain the cleanliness of the inner polling 274, and expensive polling (274) can be used semi-permanently.

The terms and words used in the present specification and claims described above should not be construed as being limited to ordinary or dictionary meanings, and the present inventors appropriately use the concept of terms in order to describe their invention in the best way. It should be interpreted as a meaning and concept consistent with the technical spirit of the present invention based on the principle that it can be defined in the following way.

Therefore, the configurations shown in the drawings and embodiments described in this specification are only one of the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, so they can be replaced at the time of the present application. It should be understood that there may be many equivalents and variations.

1: injection mold system 100: injection mold
110: cooling passage 200: cooling circulation unit
210: coolant tank 211: heater
213: temperature sensor 220: circulation line
221: supply pipe 223: return pipe
230: circulation pump 240: scale prevention device
245: pressure sensor 247: control valve
250: air nozzle 251: nozzle body
252: air injection hole 253: installation space
255: pipe cap 257: nozzle tube
258: nozzle hole 260: ion filter
270: air separator 271: air chamber
272: entrance 273: exit
274: polling 275: air vent
276: level sensor

Claims (6)

an injection mold 100 having a plurality of cooling passages 110;
In the injection mold system 1 including a cooling circulation unit 200 for supplying cooling water to the cooling passage 110 of the injection mold 100,
The cooling circulation unit 200,
a cooling water tank 210 including a heater 211 and a temperature sensor 213 to store cooling water;
a circulation line 220 connected from the cooling water tank 210 to the cooling passage 110 of the injection mold 100 to circulate, supply and recover cooling water;
a circulation pump 230 provided in the front circulation line 220 of the cooling water tank 210 to pump and supply cooling water to the cooling passage 110 of the injection mold 100;
It is provided in front of the circulation pump 230 to prevent scale by supplying air to the cooling water flowing into the cooling passage 110 of the injection mold 100 along the circulation line 220 to remove the scale of the cooling passage 110. device 240;
Scale is formed like metal ions in the cooling water supplied to the cooling passage 110 by bypass connection between the circulation pump 230 and the scale prevention device 240 toward the rear circulation line 220 of the cooling water tank 210. It consists of an ion filter 260 for removing ions that cause
The scale prevention device 240,
a pressure sensor 245 that detects high-pressure air pressure;
a control valve 247 for controlling the supply of high-pressure air;
An air nozzle 250 connected to the circulation line 220 to supply high-pressure air to the cooling water;
Including, the pressure sensor 245, the control valve 247, and the air nozzle 250 are sequentially connected to the pipe,
The air nozzle 250,
A nozzle body 251 having an installation space 253 formed therein and having an air injection hole 252 through which the high-pressure air of the control valve 247 is introduced through one side of the circumference of the center;
Pipe caps 255 fastened to both ends of the nozzle body 251 and connected to pipes;
The nozzle tube body 257 is hollowly installed in the installation space 253 of the nozzle body 251, has a plurality of nozzle holes 258 penetrating in a radial direction along the circumference, and implements a venturi effect on the passing cooling water. made up of
The nozzle hole 258,
The high-pressure air injected into the nozzle tube body 257 becomes a cyclone and passes through the nozzle tube body 257 so that the flow rate increases rapidly based on the reference line crossing the center of the nozzle tube body 257. It is formed through the oblique direction along the circumference of the nozzle tube body 257 in an oblique direction at an angle of 160 °,
The circulation line 220 connected to the rear of the cooling passage 110 of the injection mold 100 is further provided with a water separator 270 for reducing the burden on the circulation line 220 due to the impact of the water hammer. A system for preventing mold scale in the injection process.
delete delete delete The method of claim 1,
The water separator 270,
an air chamber 271 connected to the circulation line 220 and having an inlet 272 and an outlet 273 through which cooling water flows in and out;
a polling unit 274 accommodated in the air chamber 271 to separate the air contained in the cooling water;
an air vent 275 provided on the upper part of the air chamber 271 to discharge air separated from the inside of the air chamber 271;
A system for preventing mold scale in the injection process, characterized in that it comprises a.
The method of claim 5,
In the air vent 275,
A system for preventing mold scale in the injection process, characterized in that the level sensor 276 that opens and closes according to the air pressure level inside the air chamber 271 as an option.

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