KR101246926B1 - Uniform feed apparatus for silicone injection molding - Google Patents

Abstract

PURPOSE: A continuous feeding apparatus for silicone injection molding is provided to supply a constant amount of liquefied silicone and hardener through a distribution side to a silicone injection molding equipment, wherein each of the silicon liquid and the hardener liquid is respectively supplied from separated cylinders to satisfy a fixed supply amount. CONSTITUTION: A continuous feeding apparatus for silicone injection molding includes a frame, a position sensor, a constant amount supply unit(40), and a check valve. The frame supports a push plate. The position sensor is installed on the frame, and detects whether the push plate reaches a predetermined position or not. The constant amount supply unit includes multiple hydraulic cylinders(45). The check valve enables a hardener liquid and a liquefied silicone raw material to be transferred in a one-way direction.

Description

Uniform feed apparatus for silicone injection molding

The present invention relates to a quantitative supply device for silicone injection molding, and more particularly, in the supply of a silicone liquid and a hardener liquid for molding a silicone product to a silicon injection apparatus, the mixing ratio cannot be maintained by the amount set by the difference in physical properties. The present invention relates to a quantitative supply device for silicon injection molding for supplying a quantitative supply of a liquid silicone raw material and a cured material to prevent a phenomenon.

In general, silicone has a heat resistance, cold resistance, electrical insulation, chemical safety, abrasion resistance, etc. based on a stable chemical structure that is incomparable with other resin materials, and thus is widely used in home appliances, medical devices, and industrial machines. Although the press molding method using a high temperature hardening material has been applied in manufacturing, the competitiveness of the product which requires the dimensional accuracy is lowered.

In order to solve this disadvantage, a method of mixing and using a liquid silicone material and a curing agent has been attempted. As related patents, Korean Patent Laid-Open Publication No. 2008-0066271 and Korean Patent Publication No. 1077881 have been tried. Known.

The former patent discloses a silicon mixing supply device configured to mix silicon stock solutions A and B in an accurate 1: 1 ratio to another device, comprising: a casing; Hydraulic suction means is configured in the upper end of the casing, the hydraulic portion, the hollow shaft and the suction plate; Lifting means which is configured at the lower end of the casing, the storage container seated on the fixed plate to be in close contact with the suction plate; It consists of discharge means etc. which are comprised in one side of the said casing, and consisted of the discharge pipe path which guides the discharge conveyance of several silicon stock solution. Accordingly, the effect of minimizing molding defects is expected by precise 1: 1 discharge amount control of the silicon stock solution.

According to the latter prior patent, the liquid silicone is directly added or mixed with the additive in the liquid silicone, so that curing time is shortened, workability is improved, productivity is increased, and the liquid silicone is conveyed and mixed in an airtight state and injected. It is possible to produce molded products with excellent physical properties by preventing contamination of raw materials by being supplied to molding equipment, and to produce small high-precision molded products.

However, according to the prior patent, it is difficult to mix two raw materials having different physical properties (viscosity, density, etc.) at an accurate ratio at all times regardless of the surrounding environment, and thus, there is a great possibility of frequent process defects and quality deterioration. In other words, if the liquid silicone and the curing agent are added at the correct ratio and do not maintain a constant mixing state, clogging occurs in the process of being pushed into the injection mold or the finished products stick to each other after injection, resulting in deterioration of quality and productivity.

1. Korean Laid-Open Patent Publication No. 2008-0066271 "Silicon Mixing Supply Device" (published date: July 16, 2008) 2. Korean Registered Patent Publication No. 10788788 "Liquid-silicon multi-component injection system" (published date: May 4, 2011)

An object of the present invention for improving the conventional problems as described above, in the supply of the silicone liquid and the hardener liquid for the molding of the silicone product to the silicon injection device, the phenomenon of not maintaining the mixing ratio by the amount set by the difference in physical properties It is to provide a quantitative supply device for silicon injection molding for supplying a quantitative supply of the liquid silicone raw material and the hardened material to prevent.

In order to achieve the above object, the present invention is a device for injection molding the injection of the curing liquid and the liquid silicon raw material into the mold in the injection molding machine: connected to send the curing liquid and the liquid silicon raw material to the injection machine, by a pump The inlet hole is formed so that the curing liquid and the liquid silicon raw material flows into the pressurized cylinder, respectively, and the outlet hole is formed so that the curing liquid and the liquid silicon raw material of the pressurized cylinder are discharged to the mixer. A lower plate having a T-shaped flow path connected thereto, and an ascending movement by the boss and ascending with the inflow of the hardening liquid and the liquid silicon raw material into the pressure cylinder so that the raw material on the pressure vessel filled with the curing liquid and the liquid silicone is simultaneously fed to the mixer. A frame supporting the push plate that moves and moves downward by the pressurizing operation of the plurality of hydraulic cylinders; A position sensor installed in the frame to detect the arrival of the set position of the push plate; A pressurizing tube installed on the lower plate to receive a curing liquid and a liquid silicon raw material, a top having a pusher pushed up the push plate and a lower end having a plunger accommodated in the pressurized tube, and a plurality of presses connected to the push plate to apply pressure to the push plate. A fixed quantity supply means 40 having a hydraulic cylinder; And the lower and lower ends formed in a conical shape are connected to the inlet and outlet holes of the curable liquid and the liquid silicon raw material, respectively, up and down by an air cylinder on the upstream and downstream holes formed at a spaced position, and the upstream and downstream bosses are downstream. And a check valve having a poppet having a structure for opening and closing the ball so that the curing liquid and the liquid silicon raw material are transferred in one direction.

In addition, according to the present invention, the frame is characterized by having an inlet hole and an outlet hole on the lower plate.

Further, according to the present invention, the position sensor is characterized by detecting the arrival of the set position of each push plate using a proximity switch or a limit switch.

In addition, according to the present invention, the fixed-quantity supply means is a pressure cylinder fixed to accommodate the raw material in the lower plate, the upper end is fixed to the push plate and the lower end of the plunger is accommodated in the pressure cylinder, the hydraulic cylinder connected to apply a pressing force to the push plate Characterized in having a.

At this time, the quantitative supply means is characterized in that it further comprises a check valve for opening and closing the flow path to the air cylinder on the inflow and outflow path of the raw material.

As described above, according to the present invention, in supplying the raw material of silicon to the silicon injection device, the silicone liquid and the hardener liquid having different physical properties are supplied to different cylinders, respectively, and the dispensing valve is formed in a state where the quantity is reached. Through this, there is an effect to supply a quantitative supply of the liquid silicone and the cured material to the silicon injection device.

1 is a configuration diagram showing the injection device according to the invention as a whole.
2 is a configuration diagram showing the main part of the apparatus according to the present invention from the front;
3 is a schematic view showing the main part of the apparatus according to the present invention in a side view;
4 is a block diagram showing a check valve applied to the apparatus according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an apparatus for injection molding injection of a liquid silicon raw material from the injection machine 15 into the mold 10. The liquid silicone raw material means a silicone liquid and a hardener liquid, but is not limited thereto, and an auxiliary component may be added according to process conditions. In a typical product, the ratio of the silicone liquid and the hardener liquid is maintained at 1: 1.

According to the present invention, the frame 20 which independently supports the plurality of push plates 25 so as to be movable up and down independently is connected to the raw material to the injection machine 15. The frame 20 is installed at a position adjacent to the mold 10 and the injection machine 15 and is piped through a hose. The frame 20 forms a hexahedral skeleton with the lower plate 21 and the upper plate 22, and supports the push plate 25 between the lower plate 21 and the upper plate 22. The push plate 25 presses the silicon raw material to the side of the mixer 12 attached to the injection machine 15. Of course, the push plate 25 to pressurize the silicone liquid and the push plate 25 to pressurize the hardener liquid is supported through a separate guide rail (not shown) to move independently.

At this time, the frame 20 is preferably provided with an inlet hole 23 and the outlet hole 27 on the lower plate (21). An inlet hole 23 is formed forward from the lower plate 21 of the frame 20 and an outlet hole 27 is formed backward. If the inlet hole 23 and the outlet hole 27 are provided on the same flow path, it is advantageous in that a separate pipe connection is omitted and the configuration is simplified. The silicon raw material is introduced into the inlet hole 23 by the pump 48 and is sent out to the mixer 12 through the outlet hole 27 by the pressing force of the push plate 25. Of course, the inlet hole 23 and the outlet hole 27 are formed to enter and exit the silicone liquid and to enter and exit the hardener liquid.

In addition, according to the present invention is a structure in which the position sensor 30 is installed in the frame 20 to detect the arrival of the set position of the push plate (25). As the silicon raw material flows into the inlet hole 23, the push plate 25 rises, and when the push plate 25 reaches the set position, the position sensor 30 generates a signal. Since the physical properties of the silicone liquid and the hardener liquid, in particular, the viscosity is different, even if the transfer to different pumps 48, the time difference due to the filling occurs. Since the difference in the physical properties may change depending on the surrounding environment (temperature), it is determined through the position sensor 30 that each push plate 25 reaches the set position.

At this time, the position sensor 30 detects the arrival of the set position of each push plate 25 using a proximity switch or a limit switch. Proximity switches or limit switches can be installed at the upstroke end of each push plate 25 to increase operational reliability with a simple configuration. When both the push plates 25 maintain the same height in accordance with the inflow of the silicone liquid and the hardener liquid, the conditions that are sent to the injection molding machine 15 are reached at a ratio of 1: 1.

In addition, according to the present invention is a structure that is provided so that the quantitative supply means 40 independently receives the amount of the raw material set on the frame 20 and simultaneously send out. The metering-feeding means 40 is simultaneously sent to the mixer 12 in a state in which the silicon liquid and the hardener liquid are filled at a ratio of 1: 1 so as to be uniformly mixed.

At this time, the quantitative supply means 40 is a pressure cylinder 41 is fixed to accommodate the raw material in the lower plate 21, the upper end is fixed to the push plate 25, the lower end of the plunger (accommodating in the pressure cylinder 41) ( 43), the hydraulic cylinder 45 is connected to the push plate 25 to apply a pressing force. The pressure cylinder 41 is a cylindrical structure for storing the silicone liquid and the hardener liquid filled by the pump 48, respectively, in the flow path between the inlet hole 23 and the outlet hole 27 of the lower plate 21 described above. Is connected to the T-shaped flow path 24. The plunger 43 connecting the pressure cylinder 41 and the push plate 25 performs the up and down movement in proportion to the filling amount of the silicone liquid and the hardener liquid. The hydraulic cylinder 45 is disposed on the frame 20 to the side of each pressing cylinder 41 and performs the downward movement of the push plate 25 to send the silicon raw material filled in the pressing cylinder 41.

On the other hand, the fixed-quantity supply means 40 is preferably provided with a check valve 50 for opening and closing the flow path to the air cylinder 53 on each of the inlet flow path and the delivery flow path of the hardener liquid and the silicon raw material liquid. The check valve 50 is respectively installed on the upstream side of the inlet hole 23 and the downstream side of the outlet hole 27 of the lower plate 21 to perform one-way transfer of silicon raw materials.

In FIG. 4, the upstream hole 51 and the downstream hole 52 of the check valve 50 are spaced up and down relative to the poppet 54 without being located on the same line. The lower end of the poppet 54 is conical and performs opening and closing of the upstream hole 51. In the poppet 54, a boss in close contact with the downstream hole 52 is formed above the conical lower end. When the poppet 54 is raised by the operation of the air cylinder 53, the upstream hole 51 and the downstream hole 52 communicate with each other to allow the flow of silicon raw materials. On the other hand, when the poppet 54 is lowered by the operation of the air cylinder 53, both the upstream hole 51 and the downstream hole 52 maintain the closed state.

In operation, the silicon liquid and the hardener liquid constituting the silicon raw material are introduced into the pressure cylinder 41 through the inlet hole 23 by the operation of the respective pumps 48, and the filling of one pressure cylinder 41 is completed. When the signal of the position sensor 30 is generated at the upstroke end of the push plate 25, the filling is stopped, and the filling of the other pressurization cylinder 41 is completed and is positioned at the upstroke end of the other push plate 25. When the signal from the sensor 30 is generated, the filling is stopped and the hydraulic cylinders 45 on both sides are operated at the same time to simultaneously feed the raw materials of the pressure cylinder 41 to the mixer 12 via the outlet hole 27. Of course, the raw material proceeds to the inlet hole 23, the pressure cylinder 41, the outlet hole 27 by the action of the check valve 50 described above.

As a modification of the present invention, when the configuration of pressing the silicone liquid and the hardener liquid at the same time with one push plate 25, the boss projecting to the set point without fixing the plunger 43 to the push plate 25 Push plate 25 is pushed up (not shown). The position sensor 30 is installed to detect the upstroke end through the boss of each plunger 43. Accordingly, as the filling of one pressurizing cylinder 41 proceeds due to the difference in viscosity of the raw materials, the push plate 25 is raised, and the filling of the other pressurizing cylinder 41 proceeds gradually to follow the push plate 25. When the completion of filling on both sides is confirmed through the position sensor 30, the hydraulic cylinders 45 on both sides are operated at the same time so that one push plate 25 descends and the raw material of the pressure cylinder 41 passes through the outlet hole 27. It feeds to the mixer 12 simultaneously.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: mold 15: injection machine
20: frame 21: bottom plate
22: top plate 23: entrance hole
25: push plate 27: exit hole
30: position sensor 40: fixed quantity supply means
41: pressure cylinder 43: plunger
45: hydraulic cylinder 48: pump
50: check valve 51: upstream hole 52: downstream hole
53: air cylinder 54: poppet

Claims (5)

In the apparatus for injection molding the curing liquid and the liquid silicon raw material from the injection machine 15 to the mold 10:
An inlet hole 23 connected to the injection machine 15 so as to send the cured liquid and the liquid silicon raw material, and formed by the pump 48 so that the cured liquid and the liquid silicon raw material are introduced into the pressure vessel 41, respectively; Outlet hole 27 formed so that the hardening liquid of the pressure cylinder 41 and the liquid silicon raw material are discharged to the mixer 12, and a flow path between the inlet hole 23 and the outlet hole 27 and the pressure cylinder 41. The lower plate 21 having a T-shaped flow channel 24 for connecting the pressure and the raw material on the pressurizing cylinder 41 which is upwardly moved by the boss and filled with the curing liquid and the liquid silicon, is simultaneously pressed to the mixer 12. A frame 20 supporting the push plate 25 which moves upward by the inflow of the hardening liquid and the liquid silicon raw material into the cylinder 41 and moves downward by the pressurizing operation of the plurality of hydraulic cylinders 45;
A position sensor 30 mounted to the frame 20 to detect the arrival of the set position of the push plate 25;
The pressurizing tube 41 installed to receive the curing liquid and the liquid silicon raw material in the lower plate 21, and the upper end push up the push plate 25 and the lower end of the plunger 43 housed in the pressurizing tube 41. A fixed quantity supply means (40) having a boss having a plurality of hydraulic cylinders (45) connected to apply a pressing force to the push plate (25); And
It is connected to the inlet hole 23 and the outlet hole 27 of the curable liquid and the liquid silicon raw material, respectively, and is formed in the air cylinder 53 on the upstream hole 51 and the downstream hole 52 formed at a spaced position. The lower end is formed in a conical shape by opening and closing the upstream hole 51, the boss portion has a poppet 54 of the structure to open and close the downstream hole 52 to check the curing liquid and the liquid silicon raw material to be transferred in one direction Valve 50; the injection molding device for silicon injection molding, characterized in that comprises a.
delete The method of claim 1,
The position sensor 30 detects the arrival of the set position of the push plate 25 by using a proximity switch or a limit switch. delete delete

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