KR102332085B1 - Cylinder device for hot runner system - Google Patents

Abstract

The present invention includes a cylinder housing having an outlet through which high-pressure air flows in and out, a piston that moves up and down by the high-pressure air in the cylinder, and a valve pin that is coupled to the piston and moves up and down according to the movement of the piston. In the cylinder device of the hot runner system, the cylinder housing includes a body forming an accommodation space in which the piston is accommodated, a cylinder top cover and a cylinder bottom cover, wherein the cylinder device is located on the cylinder top cover, It provides a cylinder device of the hot runner system, characterized in that it further comprises a contact device for sensing when the raised piston comes into contact with the cylinder upper cover.

Description

Hot runner system and its cylinder device {CYLINDER DEVICE FOR HOT RUNNER SYSTEM}

The present invention relates to a hot runner system for injecting a molten resin into a cavity and a cylinder device thereof.

The hot-runner system heats the sprue and the runner, which serve as a flow path for the molten resin to fill the cavity in the mold for injection molding plastic products, so that it is always in a molten state. It is a system for continuous injection of products by maintaining

There are several types of hot runner systems depending on the method of sealing the gate of the nozzle, but among them, the valve type can produce plastic products by selectively opening and closing the gate using a valve pin that moves by pneumatic or hydraulic pressure.

1 is a view showing a conventional valve-type hot runner system.

As shown in FIG. 1 , the valve-type hot runner system uses high-pressure air as an operating pressure to move the valve pin 130 coupled to the piston 120 up and down.

The valve type hot runner system is largely composed of a cylinder device 100 that drives the valve pin 130 to move upward or downward using a piston 120 , and a nozzle according to the lifting operation of the valve pin 130 . The gate 211 of the 210 may include a valve device 200 that opens and closes.

Specifically, in the cylinder device 100, high-pressure air flows in and out from the outside through the air inflow channels 101 and 102, and the high-pressure air flows in or out through an air inlet formed in the cylinder housing, whereby the cylinder housing The piston 120 accommodated in the inner accommodation space to move up and down can be moved up and down in the cylinder by the high-pressure air.

The valve pin 130 coupled to the lower portion of the piston 120 is elevated in association with the elevating movement of the piston 120 , and thus the valve pin 130 penetrates the front end of the nozzle 210 . The outlet of the molten resin can be selectively opened and closed. The resin supplied from the manifold may be provided to the cavity through the resin channel 1 provided around the valve pin 130 provided in the nozzle 210 .

However, the conventional valve-type hot runner system has a problem that the movement of the valve pin cannot be known from the outside, and there is no solution to control the abnormal movement. is in demand.

US 10-1336279 B1 US 10-2019-0036728 A1

An object of the present invention is to provide a hot runner system and a cylinder device thereof that can sense the movement of a piston or a valve pin coupled thereto, and can confirm this.

In order to solve the above problems, the present invention provides a cylinder housing having an outlet through which high-pressure air flows in and out, a piston that is raised and lowered by the high-pressure air in the cylinder, and is coupled to the piston and moves up and down according to the movement of the piston. In the cylinder device of a hot runner system including a valve pin to It provides a cylinder device of a hot runner system, which is located on the upper cover, further comprising a contact device for sensing when the raised piston comes into contact with the cylinder upper cover.

According to an embodiment, the cylinder device may further include an insulator positioned at one side of the contact device to insulate between the piston accommodating space and the contact device.

According to an embodiment, the cylinder device further comprises a contact cover for blocking and supporting the retraction of the cylinder device when the piston rises, wherein the contact cover includes a screw thread and the screw thread formed on an outer circumferential surface to ascend and descend according to rotation adjustment. It is located at the upper end of the, it may include a position control knob formed to be gripped protruding so as to rotate the screw thread.

According to an embodiment, the insulator may be fixedly attached to the contact cover so as to move according to the elevation of the contact cover.

According to an embodiment, the contact device may include a power supply unit having a wirelessly rechargeable battery, a pressure sensor sensing the pressure applied by the piston, and a communication unit transmitting a detection result of the pressure sensor to an external piston controller. can

According to an embodiment, the external piston controller may adjust the reference offset upward or downward using the detection result of the pressure sensor.

According to an embodiment, when the pressure sensed by the contact device is lower than a preset normal pressure range, the external piston controller may include the reference offset such that the pressure sensed by the contact device falls within the normal pressure range. , and conversely, when the pressure sensed by the contact device is higher than a preset normal pressure range, the reference offset may be adjusted downward so that the pressure sensed by the contact device falls within the normal pressure range.

In addition, the present invention includes a valve device including the nozzle that opens and closes a gate formed at the tip of the nozzle according to the elevation of the cylinder device and the valve pin, and the resin supplied from the outside according to the opening and closing of the gate is a mold. Provides a hot runner system that is supplied to or shut off from.

The hot runner system and the cylinder device thereof according to the present invention can sense the movement of the piston or the valve pin coupled thereto, and can be confirmed through an external terminal or the like.

In addition, according to an embodiment of the present invention, the contact device for detecting the movement of the piston or the valve pin can be adjusted by simply rotating the position control knob.

In addition, according to an embodiment of the present invention, when the piston rises to the highest point but does not reach the uppermost position in the cylinder housing, or when the piston descends to the lowest point but does not reach the lowermost position in the cylinder housing, this is automatically adjusted can

1 is a view showing a conventional hot runner system.
2 is a view showing a hot runner system including a cylinder device according to an embodiment of the present invention.
3 is a block diagram of a contact device according to an embodiment of the present invention.
Figure 4 is a diagram showing the movement of the piston according to an embodiment of the present invention in a graph.
5 is a view showing a process of adjusting the reference offset by the piston controller according to an embodiment of the present invention.
6 is a view showing a contact cover according to another embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms.

The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

2 is a view showing a hot runner system including a cylinder device according to an embodiment of the present invention.

As shown in FIG. 2 , the cylinder device 100 of the hot runner system according to an embodiment of the present invention is located on the cylinder upper cover 111 , and the raised piston 120 is placed on the cylinder upper cover 111 . It may include a contact device 150 for sensing the contact.

Accordingly, the hot runner system and the cylinder device thereof according to an embodiment of the present invention can detect the movement of the piston 120 accommodated in the cylinder housing to be liftable or the valve pin 130 coupled to the lower portion thereof. .

The cylinder housing may have an outlet through which high-pressure air flows in and out through the air inlet and outlet channels 101 and 102 in order to elevate the piston 120 and the valve pin 130 coupled thereto.

High-pressure air may be used as the operating pressure for elevating the piston 120 accommodated in the cylinder housing, but it may also be hydraulic pressure other than this. By using the same sealing member, the air inlet channels 101 and 102 can be installed at the outlets, and the body for providing an accommodation space inside the cylinder housing, the cylinder upper cover 111 and the cylinder lower cover 112 are in contact. A sealing member may also be interposed in the portion.

The contact device 150 according to an embodiment of the present invention is located in the cylinder upper cover 111, and can sense the contact with the piston 120 that rises (or retreats).

Specifically, the contact device 150 according to an embodiment of the present invention, as shown in FIG. 3 , a power supply unit 153 having a wirelessly rechargeable battery, and a pressure sensor for sensing the pressure applied by the piston 120 . It may include a 152 and a communication unit 154 for transmitting the detection result of the pressure sensor 152 to the external piston controller (10).

The contact device 150 may include a power supply unit 153 having a battery that can be charged by an external commercial power source, and the power supply unit 153 may supply driving power to each component included in the contact device 150 . .

At this time, since the contact device 150 is provided in the cylinder upper cover 111 as shown in FIG. 2 , it is preferable to use a wireless method to supply power to the battery.

In addition, the contact device 150 controls each component by executing various driving programs or control programs stored in the storage device (not shown), and the control unit 151 as a means for performing the overall function of the contact device 150 . ), and the control unit 151 may transmit the detection result sensed by the pressure sensor 152 to the external piston controller 10 through the communication unit 154 .

In addition, as described above, the communication unit 154 is for transmitting and receiving data by connecting the contact device 150 to communicate with the external piston controller 10, and WLAN for wireless communication with the piston controller 10 (Wireless LAN), WiFi (Wireless Fidelity) Direct, DLNA (Digital Living Network Alliance), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), etc. may be a communication module, or Bluetooth (Bluetooth ^TM , Radio Frequency Identification (RFID), Infrared Data Association; IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), etc. communication) module.

Here, the piston controller 10 refers to a device for generating a control command for controlling the movement to raise or lower the piston 10, for example, by injecting or discharging high-pressure air into the cylinder housing to the piston ( 120) can be controlled.

In addition, the pressure sensor 152 includes an element that measures the pressure and converts the measurement result into an electrical signal and outputs it, and can sense the pressure applied from the outside.

The contact device 150 including the pressure sensor 152 may detect when the piston 120 according to an embodiment of the present invention moves backward and rises and directly or indirectly contacts the contact device 150 .

The communication unit 154 may transmit the detection result of the pressure sensor 152 to an external terminal, and the user may check the position or movement of the piston 120 or the valve pin 130 through the external terminal.

A contact cover 160 may be provided on the upper portion of the contact device 150 so as not to be pushed by the movement of the piston 120 so as to measure or sense the pressure caused by the upwardly moving piston 120 . That is, the contact cover 160 blocks or supports the movement so that the contact device 150 does not retreat or rise when the piston 120 rises, and the contact device 150 applies the pressure to the upward movement of the piston 120 . can be measured accurately.

On the other hand, the insulator 140 may be provided on one side of the contact device 150 , that is, on the lower side facing the piston 120 .

The insulator 140 blocks electricity and/or heat from passing between the contact device 150 and the piston receiving space in the cylinder housing, and is preferably an electrical and/or thermal insulator, but is applied from the piston 120 It is preferable that it is made of a material that can transmit the pressure to the contact device 150 .

For example, the insulator 140 may be a graphite material having a predetermined stiffness, but is not limited thereto.

Accordingly, the insulator 140 transmits the impact applied through the piston 120 to the contact device 150 as well as the contact device 150 including a circuit blocks the inflow of external heat, thereby It is possible to prevent the contact device 150 from malfunctioning, or to prevent the electric power stored in the power supply unit 153 built in the contact device 150 from leaking to the outside.

On the other hand, Figure 6 is a view showing a contact cover according to another embodiment of the present invention.

As shown in Figure 6, the contact cover 160 according to another embodiment of the present invention is located at the upper end of the screw thread 163 formed on the outer peripheral surface so as to rise and fall according to the rotation adjustment, the screw thread 163, It is provided to rotate the screw thread 163 and may include a protruding position adjustment knob 161 .

A through hole may be provided in the cylinder upper cover 111 so that the contact cover 160 having a screw thread 163 can be inserted and installed, and a thread corresponding to the screw thread 163 is formed on the inner circumferential surface of the through hole. The contact cover 160 can be raised and lowered according to the rotation adjustment of the adjustment knob 161 .

As a result, the insulator 140 fixedly attached to the contact cover 160 can rise and fall in conjunction with the insulator 140 according to the rise and fall according to the rotation control of the position control knob 161, and accordingly The height of the insulator 140 and the contact device 150 provided on its upper side may be adjusted.

For this purpose, as shown in FIG. 6 , the insulator 140 has a shape surrounding the contact device 150 from the lower side, and it is preferable to block the contact device 150 from passing through external electricity and/or heat. do.

If the rising height of the piston 120 is not normal, even though the piston 120 has moved upward to the top end, if it does not reach the position of the insulator 140 and the contact device 150 where the inner upper end of the cylinder housing is located, the user It may be misjudged that the piston 120 has not moved to the uppermost stage through the terminal.

Accordingly, the user can easily adjust the height of the lower end of the insulator 140 and the contact device 150 by adjusting the position adjustment knob 161 , and eventually the height of the contact device 150 that detects the height of the uppermost end of the piston 120 . is fine-tuned by the user as needed, thereby reducing the possibility of such a misjudgment.

On the other hand, it is a diagram showing the movement of the piston according to an embodiment of the present invention in a graph, Figure 5 is a view showing a process of adjusting the reference offset by the piston controller according to an embodiment of the present invention.

When the initial position of the piston 120 is normal, the piston 120 moving up and down in the cylinder housing by the high-pressure air supplied from the outside rises to open the gate 211 or closes the gate 211 . When descending to do so, it can be represented as shown in Fig. 4 (a).

However, the initial position of the piston 120 may be pushed up or down by various factors, etc., for example, when the initial position of the piston 120 is biased downward, according to a control command generated from the piston controller 10, the piston ( Although the gate 211 may not be completely opened despite moving 120 to the uppermost stage, on the contrary, when the initial position of the piston 120 is biased upward, the piston according to the control command generated from the piston controller 10 Even though the 120 is moved to the bottom, the gate 211 may not be completely closed.

That is, the external piston controller 10 uses the detection result of the contact device 150 (or the pressure sensor 152 ) according to the position control command of the piston 120 , and there is an error in the initial position of the piston 120 . It can be judged that there is Specifically, when the piston 120 is moved to the uppermost end, the contact device 150 does not detect the contact of the piston 120 or when the measured pressure is lower than the normal pressure range, the initial position of the piston 120 is lower It can be determined that the piston is pushed in the direction It can be judged that it has been pushed.

In this case, the piston controller 10, as shown in FIG. 5(b), sets the reference offset indicating the initial position of the piston 120 according to the pushing direction corresponding to the pushing degree of (+) or (-). It is preferable to set a predetermined value and automatically adjust the reference offset by applying the reference offset when generating the position control command of the piston 120 .

That is, when the detection result of the contact device 150 (or the pressure sensor 152) is lower than the preset normal pressure range, the piston controller 10 sends the contact device 150 (or the pressure sensor 152) to the contact device 150 (or the pressure sensor 152). The reference offset can be adjusted upward so that the pressure sensed by the pressure falls within the preset normal pressure range, and on the contrary, when the detection result of the contact device 150 (or the pressure sensor 152) is higher than the preset normal pressure range, The reference offset may be adjusted downward so that the pressure sensed by the contact device 150 (or the pressure sensor 152 ) falls within a preset normal pressure range.

As above, preferred embodiments of the present invention have been described in detail with reference to the drawings. The description of the present invention is for illustrative purposes, and those of ordinary skill in the art to which the present invention pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is indicated by the claims to be described later rather than the above detailed description, and all changes or modifications derived from the meaning, scope, and equivalent concept of the claims are included in the scope of the present invention. should be interpreted

1: resin channel 10: piston controller
100: cylinder device 101, 102: air inlet channel
111: cylinder upper cover 112: cylinder lower cover
120: piston 130: valve pin
140: insulator 150: contact device
151: control unit 152: pressure sensor
153: power unit 154: communication unit
160: contact cover 161: position control knob
162: thread 200: valve device
210: nozzle 211: gate

Claims (8)

a cylinder housing having an outlet through which high-pressure air flows in and out;
a piston ascending and descending by the high-pressure air in the cylinder; and
a valve pin coupled to the piston and ascending and descending according to the movement of the piston;
In the cylinder device of the hot runner system comprising a,
The cylinder housing includes a body forming an accommodating space in which the piston is accommodated, a cylinder upper cover and a cylinder lower cover,
The cylinder device is
A contact device located on the upper cylinder cover and detecting the contact of the raised piston - The contact device includes a power supply unit having a wirelessly rechargeable battery, a pressure sensor for sensing the pressure applied by the piston, and the detection of the pressure sensor - Including a communication unit that transmits the result to an external piston controller;
an insulator positioned at one side of the contact device to insulate between the piston accommodating space and the contact device; and
A contact cover comprising a screw thread formed on the outer circumferential surface of the through hole provided in the cylinder upper cover and a position knob knob formed to protrude to be gripped so that the screw thread can be rotated along the screw thread to elevate the contact device further including;
The external piston controller,
The cylinder device of the hot runner system, characterized in that by using the detection result of the pressure sensor, the reference offset indicating the initial position of the piston is adjusted upward or downward. delete delete The method of claim 1,
The insulator is
The cylinder device of a hot runner system, characterized in that it is fixedly attached to the contact cover so as to move according to the elevation of the contact cover. delete delete The method of claim 1,
The external piston controller,
When the pressure sensed by the contact device is lower than a preset normal pressure range, the reference offset is upwardly adjusted so that the pressure sensed by the contact device falls within the normal pressure range, and vice versa When the pressure is higher than a preset normal pressure range, the cylinder device of the hot runner system, characterized in that the downward adjustment of the reference offset so that the pressure sensed by the contact device falls within the normal pressure range. A cylinder device according to any one of claims 1 to 7; and
a valve device including the nozzle which opens and closes a gate formed at the tip of the nozzle according to the elevation of the valve pin;
Including, a hot runner system in which the resin supplied from the outside is supplied or blocked to the mold according to the opening and closing of the gate.

Images