KR100676728B1 - Electric valve system for injection molding - Google Patents

Abstract

An electric valve system for injection molding is provided to enable a worker to adjust an opening and closing degree of a valve pin within a short time. An electric valve system for injection molding includes a nozzle(20) coupled with a manifold(10) to receive resin and having a valve pin so as to open and close a gate through ascending and descending operations, a clamping plate(50) provided in the upper side of the manifold and having a cold water pipe(51) to circulate cold water, a forward and reverse motor(31) having a rotor(33) provided in the upper side of the clamping plate to rotate by electric power and an elevating screw shaft(35) coupled with an inner circumference of the rotor to be connected to the valve pin by a coupler, an elevating plate(42a) spaced apart from the motor to be elevated, a detector fixed to a side of the elevating plate to detect the elevating screw shaft to control the motor, and an adjusting post(41) coupled with a screw hole formed at a side of the elevating plate by threads so as to move the elevating plate in the vertical direction.

Description

Electric valve system for injection molding

1 is a cross-sectional view showing an injection molding machine valve device using a hydraulic pressure according to the prior art,

Figure 2 is a cross-sectional view showing a valve device for electric injection molding machine according to an embodiment of the present invention,

3 is a cross-sectional view showing a blocked state of the nozzle in the electric injection molding machine valve device of FIG.

Figure 4 is a perspective view for explaining the configuration of the sensing means in the electric injection molding machine valve device of FIG.

<Explanation of symbols for the main parts of the drawings>

10: manifold 20: nozzle 25: valve pin

30: drive means 31: forward and reverse motor 32: stator

33: Rotor 34: Rotating Shaft 35: Lifting Screw Shaft

36 detection unit 37 coupler 40 detection means

41: adjustment post 41a: knob 41b: screw portion

42 detector 42a lifting plate 43 guide pin

50: clamping plate 51: cooling water pipe

The present invention relates to a valve apparatus for an electric injection molding machine which lifts and lowers a valve using an electric motor, and more particularly, an electric motor that can precisely and variably adjust the opening and closing amount of a valve by simply operating the operator. An injection molding machine valve device.

In general, an injection molding machine for molding a plastic product injects a water support material into a manifold from a mold cylinder in which resin is melted, and the injected resin is distributed evenly along a resin channel branched in the manifold to be coupled to the bottom of the manifold. It is a device that is supplied to each of the at least one nozzle and injected into the cavity of the mold, which is a product forming mold.

The injection molding machine is configured to open and close the gate by the lifting and lowering operation of the valve pin, and in the case of molding several pieces at a time according to the quantity of molded products, a manifold type that receives resin through a manifold is used, and a single product is produced. Single type is used when

1 is a cross-sectional view showing a multi-cavity injection molding machine valve device for elevating the valve pin by using a high-pressure air as the operating pressure according to the prior art. As shown in the related art, the conventional multi-cavity injection molding machine valve device is composed of a driving unit 100 and the valve device 200 and uses high pressure air as a driving source for the lifting operation of the valve pin 210.

That is, the driving unit 100 is formed with a plurality of air channels (110, 120) which is a pipe for supplying and discharging air of high pressure from the outside, and selectively through the plurality of air channels (110, 120) The piston 140 in the cylinder 130 moves up and down by the high pressure air flowing in. At this time, the lower end of the piston 130 has a structure in which the valve pin 210 is connected and interlocked. In addition, the valve pin 210 is configured to selectively block or open a gate that forms the front end of the nozzle 220 by being elevated in conjunction with the piston 130.

On the other hand, the valve device 200 includes a nozzle 220 to which the heater is wound to prevent the solidification of the resin by forming an outer body, the valve pin 210 in the nozzle 220 in the vertical direction It is a structure that is installed to achieve lifting. Here, the nozzle 220 is a resin channel 230 is formed with a predetermined gap around the valve pin 210, both ends of the resin channel 230, the gate of the nozzle and the resin channel of the manifold 300 Each structure is connected to the 310.

In the injection molding machine valve device for the multi-cavity mold configured as described above, when a high-pressure operating pressure is selectively supplied through the air channels 110 and 120, the piston 140 moves up or down, and at the same time, the valve pin 210 is interlocked. Lifting operation is performed integrally. Therefore, as the piston 140 is elevated, the gate of the nozzle is opened or shut off, and as a result, the resin supplied through the manifold 300 is supplied into the mold or blocked through the gate.

In summary, the valve gate device for the injection molding machine to operate the air pressure according to the prior art to raise the piston 140 by selectively supplying the high pressure air through the corresponding air channels (110, 120) into the cylinder (130). In this case, in conjunction with the piston 140, the valve pin 210 opens and closes the gate of the nozzle.

However, since the valve device according to the related art configured as described above uses high pressure air as an operation source for elevating the valve pin, it is necessary to adopt an airtight structure to prevent air leakage and a large pneumatic device for supplying the working pressure. As it requires a compressor, the structure is complicated by its volume, which is not only limited to the installation space but also has a disadvantage of extremely poor maintenance and management. In addition, when applied to a multi-cavity mold having a plurality of nozzles, due to the dimensional dispersion of each nozzle, a deviation occurs in the injection amount of each nozzle, there was a problem that it is difficult to mass-produce a molded article having a uniform quality.

In order to solve such a problem, the applicant has applied for utility model registration No. 2002-09883 (Registration No. 0280604, registration decision), Utility Model Registration Application No. 2002-09884 (Registration No. 0280605, Registration Maintenance Decision), utility Application for registration of utility model No. 2002-09885 (registration No. 0280606, registration maintenance decision), application for utility model registration No. 2002-19175 (registration No. 0290456, registration maintenance decision), application for utility model registration No. 2003-0034932 (registration) No. 0341515 registration maintenance decision, Utility Model Registration Application No. 2003-0038360 (Registration No. 0344137 registration maintenance decision), etc. has proposed a valve device for operating the valve pin in the vertical direction by the power source.

Looking at the configuration of these valve device roughly, it consists of a valve body and a drive means largely, the valve body is a resin flow path for injecting the resin into the mold through the gate provided at the front end is formed Take the general valve structure. As the driving means, a forward / reverse motor or an actuator for raising and lowering the valve pin by power supply is used.

In this way, the applicant's prior application of the valve device is possible to reduce the overall size of the valve device by the structure of employing a forward / reverse motor or an actuator driven by a power supply as a drive source, thereby increasing the degree of freedom in mold design. In addition, the movement amount of the valve pin can be controlled quickly and precisely.

However, the prior application of the present applicant, the valve device is configured to configure the motor or actuator independently for each nozzle to control the lifting and lowering of the valve pin for opening and closing the nozzle, at this time, because the operating characteristics are different for each drive source There is a disadvantage that it is difficult to match the nozzle opening and closing time of the same.

In order to improve this, the method of controlling the operation time of the valve pin by varying the voltage of each driving source, etc. is implemented. However, since an expensive variable voltage circuit must be additionally installed, the manufacturing cost is increased.

In addition, the control of the valve pin through the variable voltage circuit is difficult and precise control is difficult. As a result, it takes a lot of time for setting work for initial operation of the device or setting after restarting the device after parts replacement. There was a problem causing a decrease in productivity.

The present invention has been made to solve the above problems, an object of the present invention is to improve the workability at the time of setting the device by allowing the operator to variably control the opening and closing amount of the valve pin within a short time with a simple operation To provide an electric injection molding machine valve device that can increase the.

Electric injection molding machine valve device according to the present invention for realizing the above object is coupled to the manifold is supplied with a resin and the nozzle in the inner center is provided with a valve pin for opening and closing the gate by the lifting operation, and the manifold It is provided on the upper side and the clamping plate is provided with a coolant pipe circulating the coolant therein, and the rotor provided on the upper side of the clamping plate rotated by the power supply and screwed to the inner peripheral surface of the rotor has a vertical displacement In the electric injection molding machine valve device comprising a forward and reverse motor having a lifting screw shaft, one end of which is connected to the valve pin by a coupler,

A plate-shaped elevating plate provided on an upper side of the forward / reverse motor so as to be elevated at intervals; A detector which is fixed to one side of the upper surface of the elevating plate and detects when the elevating screw shaft protrudes upward of the forward / reverse motor to control the driving of the forward / reverse motor; One end is screwed into the screw hole formed on one side of the elevating plate is characterized in that it comprises a control post for moving the elevating plate in the vertical direction in accordance with the operator's rotation operation force.

As a preferable feature of the present invention, the forward and reverse motors are configured to be wrapped by a hollow hollow case, and the case is configured to be fixedly coupled to an upper surface of the clamping plate.

As another desirable feature of the present invention, the detector is configured to be height-adjusted by each control post or provided as a pair, provided in pairs at intervals of up and down so as to control the rising position and the falling position of the valve pin independently. The drive is further configured to drive the forward and reverse motors by a set value based on the detection time.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are consistent with the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It must be interpreted as meaning and concept.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the electric injection molding machine valve device according to the present invention will be described in detail.

Figure 2 is a cross-sectional view showing the electric injection molding machine valve device according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a blocked state of the nozzle in the electric injection molding machine valve device of FIG.

And, Figure 4 is a partial perspective view of the main portion for explaining the configuration of the sensing means in the electric injection molding machine valve device of FIG.

As shown in the present invention, the electric injection molding machine valve device of the present invention greatly opens and closes the valve pin 25 at the end of the driving means 30 for elevating the manifold 10, the nozzle 20, and the valve pin 25. And detecting means 40 for detecting and controlling the driving means.

The manifold 10 has a substantially metal plate shape and is formed in a branched shape of the resin channel 10a through which the water support material in the molten state is moved, and moves along the resin channel 10a on the upper and lower surfaces thereof. In order to prevent the resin from solidifying, it is a structure in which a wire type heater wire (not shown) that receives power supply and generates heat is embedded.

The manifold 10 has a structure in which a clamping plate 50, which is a kind of cooling panel, is provided on an upper side thereof, and a cooling water pipe 51 through which coolant is supplied and circulated is provided inside the clamping plate 50.

On the other hand, the upper side of the clamping plate 50 is provided with a drive means 30 for providing a lift drive force for lifting the valve pin 25, the lower side of the manifold 10 is supplied with resin to the mold The nozzle 20 for injecting is provided.

The nozzle 20 is provided in a hollow tubular shape, and a heater wire h, which is a heating element, is wound around the outer circumferential surface thereof to prevent the resin from solidifying, and the resin channel 10a of the manifold 10 is located at the inner center thereof. The resin channel 20a is formed to be connected to the resin channel 20a. The resin channel 20a is connected to a resin outlet that forms the front end of the nozzle 20, that is, a gate (unsigned) to communicate with the outside. In this case, the gate is provided in contact with one end of a mold for molding an injection molded product.

The nozzle 20 is provided with a valve pin 25 of the length member having a smaller diameter than the inner diameter of the resin channel (20a) formed in the center of the nozzle 20, the valve pin 25 at this time when the nozzle is lowered The exit of 20, that is, the gate, is blocked.

On the other hand, the valve pin 25 is to open and close the gate by the lifting operation, the upper end portion of the lifting screw shaft 35 of the drive means 30 through the manifold 10 and the clamping plate 50 for this purpose It is a structure that is connected to.

The driving means 30 is fixedly installed above the clamping plate 50 to generate a driving force for elevating the valve pin 25. The forward / reverse motor 31 substantially generates the driving force by power supply. And a coupler 37 which connects the lifting screw shaft 35 and the valve pin 25 of the forward and reverse motors 31 and integrally interlocks therewith.

Here, the forward and reverse motors 31 are stator 32 made of an excitation coil and are arranged with a gap in the inner circumferential surface of the stator 32 to form electromagnetic force by interaction, and thus a plurality of magnetic poles along the circumferential surface. The rotor 33 made of this alternately magnetized tubular magnet and a hollow rotary shaft 34 fitted to the inner circumferential surface of the rotor 33 to rotate integrally with each other and the rotary shaft 34 One end is screwed to the inner circumferential surface and both ends are constituted by the lifting screw shaft 35 of the length member protruding to the outside of the forward and reverse motor (31).

In this case, the lifting screw shaft 35 has a structure in which a lower end thereof is connected to the upper end of the valve pin 25 through the coupler 37, and the lifting screw shaft 35 is not rotated when the rotating shaft 34 rotates. One end may be assembled to the forward and reverse motors 31 in a square structure so that it can be lifted up or down, or the coupler 37 and a space in which the coupler 37 is accommodated may be formed in a square structure.

In addition, the coupler 37 is a connecting member for connecting the valve pin 25 and the lifting screw shaft 35, and is provided integrally with the lifting screw shaft 35 as in the present invention, or provided separately processed. It is preferable to form a material having a low thermal conductivity so that heat on the valve pin 25 can be prevented from being transferred to the elevating screw shaft 35. Since the coupler 37 serves to connect the shaft and the shaft may be variously implemented by known techniques.

When the current is applied to the stator 32 made of the excitation coil from the outside, the forward and reverse motors 31 configured as described above generate an electromagnetic force between the rotor 33, which is a magnet provided on the inner circumferential surface with a gap therebetween. As the rotor 33 rotates in the forward and reverse directions about the stator 32 by the electromagnetic force at this time, the rotation shaft 34 coupled to the inner circumferential surface of the rotor 33 rotates integrally. Is achieved. Therefore, the elevating screw shaft 35 screwed to the inner circumferential surface of the rotary shaft 34 is provided with a structure that prevents rotation, resulting in a linear movement in the vertical direction under the rotational force of the rotary shaft 34. .

The structure of the electric injection molding machine valve device configured as described above is similar to the conventional structure. However, the present invention is to enable the operator to easily control the opening and closing time of the valve pin 25 through a simple structure, for this purpose it is characterized in that the detection means 40 additional configuration.

The detecting means 40 is a plate-shaped member, which is fixed to a pair of elevating plates 42a and 42a ', which are moved in a vertical direction by the operator's operating force, and each of the elevating plates 42a and 42a'. Detectors 42 and 42 'for detecting the up / down displacement positions of the elevating screw shaft 35 and intermittently driving the forward and reverse motors 31 and the respective lifting plates under substantially operator's operation force. And adjustment posts 41 and 41 'for moving up and down 42a and 42a'.

In more detail, first, the forward and reverse motors 31 are configured to be wrapped in a case 30a, and the case 30a at this time is provided in a hollow tubular shape as shown in the drawing. The case (30a) has a long groove (s) is formed in the vertical direction so that the wire (w) connected to the detectors 42, 42 'on the upper side can be connected from the outside, the reason that the long groove (s) is formed This is because the detectors 42 and 42 'are also elevated in accordance with the height adjustment of the elevating plates 42a and 42a'.

On the other hand, the case (30a) is provided to have a size that the upper space is formed in a state in which the forward and reverse motor 31 is accommodated therein, the detection means 40 is configured in this space. That is, the upper center of the forward and reverse motor 31 is provided with the upper portion of the elevating screw shaft 35 protrudes, the control post 41, at regular intervals around the elevating screw shaft 35 41 ') are installed vertically in pairs.

As shown in the drawing, the adjustment posts 41 and 41 'are rotatably provided on the upper surface of the forward / reverse motor 31 and the upper end protrudes upward through the upper surface of the case 30a. to be. The adjusting posts 41 and 41 'are provided with threaded portions 41b and 41b' having a thread on the lower circumferential surface based on a flange (unsigned) having a diameter extending in the middle portion, and an operator is easy on the upper circumferential surface. The knobs 41a and 41a 'having the notches are formed to be easily operated.

The control posts 41 and 41 'configured as described above are configured to elevate the plate-shaped lifting plates 42a and 42a', and the lifting plates 42a and 42a 'are the control posts 41 and 41 described above. A screw hole (unsigned) of a spiral groove is formed on the inner circumferential surface of the hole penetrated to one side so as to be screwed to the threaded portions 41b and 41b of the '). In addition, a hole having a predetermined size (unsigned) is formed at one side for stable ascension and the guide pin 43 is provided vertically while the lower end is fixed to the upper side of the forward / reverse motor 31. It is a structure that passes. One of the elevating plates 42a and 42a 'is positioned on the upper side and the other on the lower side so as to detect respective positions during the up and down displacement of the elevating screw shaft 35.

Here, each of the detectors 42 and 42 'is coupled to and fixed to one side of the upper surface of the elevating plates 42a and 42a', and the detectors 42 and 42 'are raised and lowered by the elevating screw shaft 35. It detects the top end of each time and serves to control the driving of the forward and reverse motors 31.

Meanwhile, in order to increase the detection efficiency of the detectors 42 and 42 ', a detector 36 having an expanded diameter may be additionally configured at the upper end of the lifting screw shaft 35 as shown in the drawing.

As shown in FIGS. 2 and 3, the detecting means 40 configured as described above includes a detector 42 that detects the uppermost end of the lifting screw shaft 35 when the lifting screw shaft 35 rises, and the lifting screw shaft 35 when the lifting screw shaft 35 is lowered. The opening and closing position of the valve pin 25 interlocked with the elevating screw shaft 35 can be confirmed through the detector 42 ′ which detects the uppermost end, and when the maximum raising position of the valve pin 25 is to be changed. When lifting and lowering the elevating plate 42a located on the upper side and changing the maximum lowering position of the valve pin 25, the elevating plate 42a 'located on the lower side is raised and lowered. At this time, each of the elevating plate (42a, 42a ') is carried out by adjusting by using the respective adjustment post (41, 41').

Meanwhile, in the present invention, the position of the valve pin is controlled by detecting a lift point of the lift screw shaft by configuring a plurality of detectors, but the present invention is not limited thereto, and can be implemented by configuring only one detector. In the case of using the detector, the controller may be additionally installed and controlled by driving the forward and reverse motors for a preset time based on the detection time of the detector.

Referring to the operation of the electric injection molding machine valve device of the present invention configured as described above are as follows.

Referring to the opening and closing operation of the nozzle 20, when the power for forward rotation is supplied to the forward and reverse motor 31 in the state that the gate of the nozzle 20 is open as shown in FIG. 2, the forward and reverse motor 31 The rotating shaft 34 is rotated in one direction, and the lifting screw shaft 35 screwed to the rotating shaft 34 is moved in conjunction with the downward. Accordingly, the valve pin 25 connected to the lifting screw shaft 35 and the coupler 37 also moves downward to block the gate as shown in FIG. 3.

In addition, when the power supply for reverse rotation is supplied to the forward / reverse motor 31 in a state where the gate is blocked as described above, that is, the valve pin 25 is lowered, the forward / reverse motor 31 is rotated. The shaft 34 rotates in the reverse direction, and as a result, the lifting screw shaft 35 screwed to the rotary shaft 34 moves upward in conjunction with the shaft 34. Therefore, the valve pin 25 connected to the lifting screw shaft 35 and the coupler 37 moves upward to achieve a gate open state as shown in FIG. 2.

When adjusting the gate opening and closing position of the valve pin 25 in the operation process as described above it can be easily carried out by using the detection means (40).

Hereinafter, a case in which the maximum raising position of the valve pin 25 is raised will be described with reference to FIGS. 2 and 3.

First, when the adjustment post 41 is rotated in one direction, the elevating plate 42a screwed thereto is raised, and as a result, the position of the detector 42 is moved upward compared to the conventional elevating screw shaft 35 and the coupler 37. The valve pin 25 is connected to the maximum upward position is moved up compared to the conventional.

On the contrary, when the control post 41 is rotated in the reverse direction, the lifting plate 42a is lowered in association with the control post 41, and as a result, the maximum opening position of the valve pin 25 is moved downward compared to the conventional one, thereby reducing the maximum opening amount of the gate.

In addition, the case where the maximum downward position of the valve pin 25 is explained, first, the adjustment post 41 'is rotated in one direction. Then, the elevating plate 42a 'screwed to the adjusting post 41' is raised, and as a result, the position of the detector 42 'is moved upward compared to the conventional, the elevating screw shaft 35 and the coupler 37. The valve pin 25 connected by) is moved upward in position in the lowered state.

On the contrary, when the control post 41 'is rotated in the reverse direction, the lifting plate 42a' is lowered in association with the control post 41 ', and as a result, the maximum downward position of the valve pin 25 is downwardly moved.

Through this process, the position of the opening / closing amount of the valve pin 25 can be controlled by the detecting means 40 for detecting the lifting height of the lifting screw shaft 35, thereby enabling rapid and accurate control.

In particular, it is not only economical because there is no need to use an expensive encoder and a stepping motor equipped with a controller for controlling the same, and because the encoder detects and controls the rotational speed of the motor, it is difficult to accurately detect the present invention. The lifting means of the valve pin 25 can be easily and quickly controlled by the operator through the detecting means 40 which adds the lifting screw shaft 35 to the widely used low-cost motor and detects the displacement in the vertical direction. Will be.

On the other hand, the present invention is not limited to the described embodiments, it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

The electric injection molding machine valve device constructed and operated as described above detects the lift position of the lift screw shaft which interlocks with the valve pin and intercepts the gate opening / closing time of the valve pin, thus enabling precise control and the operator rotating the control post. It is possible to confirm the opening and closing time of the gate in real time only with a simple operation to make it possible to improve the workability and to mass-produce high-quality mass molded products.

In particular, when the lifting screw shaft has a displacement in the vertical direction, the position is detected and the driving of the forward and reverse motors is interrupted. Therefore, the valve pin can be precisely controlled even when the rotation speed of the motor is irregular, thus ensuring high reliability. In addition, it is possible to use a motor that is generally widely used, so there is a very useful effect in the industry that can be economically performed.

Claims (3)

Clamping plate that is coupled to the manifold and supplied with a resin, and a nozzle having a valve pin for opening and closing the gate by an elevating operation at the inner center thereof, and a cooling water pipe provided with an upper side of the manifold to circulate the cooling water therein. And a forward and reverse shaft provided on the upper side of the clamping plate and having a vertical displacement by being screwed to the inner circumferential surface of the rotor with a power supply, and having a lifting screw shaft having one end connected to the valve pin by a coupler. In the electric injection molding machine valve device comprising a motor, A plate-shaped elevating plate provided on an upper side of the forward / reverse motor so as to be elevated at intervals; A detector which is fixed to one side of the upper surface of the elevating plate and detects when the elevating screw shaft protrudes upward of the forward / reverse motor to control the driving of the forward / reverse motor; An adjustment post for moving the lifting plate in a vertical direction by receiving a rotational manipulation force of an operator by screwing one end into a screw hole formed at one side of the lifting plate; Electric injection molding machine valve device, characterized in that comprising a. The electric injection molding machine valve apparatus as claimed in claim 1, wherein the forward and reverse motors are configured to be surrounded by a hollow hollow case, and the case is coupled to and fixed to an upper surface of the clamping plate. According to claim 1 or claim 2, wherein the detector is configured to be height-adjusted by each control post while being provided in pairs at up and down intervals to independently control the rising position and the falling position of the valve pin, or a single The electric injection molding machine valve device, characterized in that the configuration for further driving the forward and reverse motor by the set value on the basis of the detection time.

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