KR101163866B1 - Hotrunner system - Google Patents

Abstract

The present invention discloses a hot runner valve device for an injection molding machine. The present invention is coupled to the manifold and the nozzle and the other side of the manifold and the rotor is rotated by the interaction with the stator and screwed to the inner peripheral surface of the rotor has a vertical displacement, one end is connected to the valve pin and coupler In the hot runner valve device for an injection molding machine comprising a motor having a lifting screw shaft to be, wherein the lifting screw shaft is projected by a blow pin at one end, the coupler is suppressed the rotation of the blow pin when the lifting screw shaft is rotated by the lifting screw The stop pin is configured to protrude from the axis to have a vertical displacement. The present invention configured as described above, when the rotor of the forward and reverse motors to rotate in the no load state in order to move to the relative position in the state in which the valve pin is raised or lowered, the lifting screw shaft screwed thereto is rotated by one rotation One end (hit pin) strikes one side (stop pin) of the coupler to which the valve pin is connected to generate a collision force, and at the same time suppresses the rotation of the lifting screw shaft. It is possible to overcome the frictional resistance caused by the supporting element such as the bushing to support and the frictional resistance when it is fitted into the outlet, so as to ensure the reliability of the stable lifting operation.

Description

Hot runner valve device for injection molding machine {Hotrunner system}

The present invention relates to a hot runner valve device for an electric injection molding machine for elevating a valve pin using an electric motor, and more particularly, to increase the reliability of the operation by simplifying the structure so that the lifting operation of the valve pin can be accurately performed. The present invention relates to a hot runner valve device for an injection molding machine.

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 molding space, that is, the cavity formed by the upper and lower molds that are product forming molds. The injection molding machine is configured to open and close the gate, that is, the outlet by the lifting and lowering operation of the valve pin, and in the case of molding several pieces at once according to the quantity of the molded products, the manifold type receiving the resin through the manifold is In the case of single product production, a single type is used.

1 is a schematic cross-sectional view of a hot runner system for an injection molding machine for lifting and lowering a valve pin using a high-pressure air as a working 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 is, an outlet, which forms the front end of the nozzle 220 by being lifted and linked 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 outlet 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 outlet of the nozzle is opened or blocked, so that the resin supplied through the manifold 300 is supplied into the mold or blocked through the outlet.

In summary, the valve gate (outlet) device for the injection molding machine operating the air pressure according to the prior art is to supply the high pressure air selectively into the cylinder 130 through the corresponding air channels (110, 120) to lift the piston (140) In this case, in conjunction with the piston 140, the valve pin 210 opens and closes the outlet (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, the injection amount of each nozzle occurs as a result, 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) has been registered a valve device for operating the valve pin in the vertical direction by the power source. Looking at the configuration of these valve apparatus roughly, it is composed of a nozzle and a driving means largely, the nozzle is a general valve structure in which a resin flow path for receiving the resin therein is injected into the mold through the outlet provided in the tip portion Take In addition, the drive means is used a forward and reverse motor or solenoid actuator for raising and lowering the valve pin by the power supply.

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 source 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 present applicant has a disadvantage in that it is difficult to economically mass-produce because it is structurally complicated because it is necessary to apply a cooling structure to cool the motor, as well as to provide a speed reducer in the case of the forward and backward motors in the various valve device that has been filed.

On the other hand, in the case of the actuator using the solenoid principle, the structure can be relatively simplified, but there is a disadvantage in that smooth driving is not performed at the time when the valve pin moves to the relative position in the open or closed state.

This is not just a solenoid actuator. In almost all hot runner systems, the valve pin is fitted to the outlet when the outlet (gate) is shut off and the other end is fitted to the bushing to support linear movement. When the valve pin is raised to open the outlet in such a state, it is possible to overcome the stop resistance applied to the valve pin (the frictional resistance caused by the supporting element such as the bushing supporting the valve pin and the frictional resistance when it is fitted to the outlet). It needs enough power, that is, large power.

That is, in most hot runner systems, a drive source with an output higher than the rated output is applied to overcome the frictional resistance initially acted upon moving to the relative position in the raised or lowered state of the valve pin and to allow the lowering or raising operation to be executed. There is a situation.

Therefore, there is not only a closed end which increases the manufacturing cost as a high output drive source (hydraulic pneumatic cylinder, forward / reverse motor, actuator) is required, but also a mold for forming a compact and precise injection molding as the volume increases. There was a problem that the degree of freedom of application is greatly limited.

The present invention was created in order to solve the problems of the prior art as described above, the object of the present invention is to apply the impact by the impact on the valve pin side during the initial operation when the valve pin is moved to the relative position in the raised or lowered state The present invention provides a hot runner valve device for an injection molding machine that overcomes the stop resistance and enables accurate lifting operation to be achieved.

Hot runner valve device for an injection molding machine according to an embodiment of the present invention for realizing the above object is provided with a valve pin coupled to one side of the manifold to receive the resin and in the inner center to open and close the gate by the lifting operation It is coupled to the nozzle and the other side of the manifold, the rotor is rotated by the interaction with the stator under the power supply and the screw is fastened to the inner peripheral surface of the rotor to have a vertical displacement, one end is connected to the valve pin and coupler In the hot runner valve device for an injection molding machine comprising a motor having a lifting screw shaft to be, wherein the lifting screw shaft is projected by a blow pin at one end, the coupler is suppressed the rotation of the blow pin when the lifting screw shaft is rotated by the lifting screw It is characterized in that the stop pin is formed to protrude so that the axis has a vertical displacement.

As a preferable feature of the present invention, the lifting screw shaft is provided with upper and lower rolling members of the ball shape for rolling contact respectively on the upper and lower surfaces. In addition, the coupler of the present invention is that the respective slide fitting groove is formed so that each end of the lifting screw shaft and the valve pin in a direction orthogonal to the lifting direction.

As another preferred feature of the present invention, the coupler has a through-hole vertically penetrated by one end of the elevating screw shaft being inserted into the center thereof, and a lower side of the coupler is fitted in a lateral direction which is a direction perpendicular to the elevating direction. A main coupler having a slide fastening groove provided with a step in a direction facing each other so as to be possible; A gap maintaining bearing in which the outer circumferential surface of the outer ring is fitted into the slide fastening groove, and one end of the elevating screw shaft is fitted into the inner circumferential surface of the inner ring; The groove is inserted into the slide fastening groove and is constrained in the up and down direction, and a space groove for forming a gap with a lower surface of the elevating screw shaft coupled to and supported by the gap retaining bearing is formed at the upper center and the valve in the lateral direction. One end of the pin is configured to include a sub-coupler is formed a pin fastening slide groove is fitted.

The hot runner valve device for an injection molding machine according to another embodiment of the present invention is a hot runner valve device for an injection molding machine in which a valve pin is lifted by a driving force of a motor, and is coupled to one side of a manifold to receive resin and to receive an inner center. It includes a nozzle having a valve pin for opening and closing the gate by the lifting operation; The lifting screw which is coupled to the other side of the manifold and is supplied with power and rotated by interaction with the stator and the other end is screwed to the inner circumferential surface of the rotor to have a vertical displacement, and a blow pin protrudes at one end thereof. Axles; A coupler to which a stop pin selectively colliding with the hitting pin protrudes into an inner space in which one end of the elevating screw shaft is inserted and received, and one end of the valve pin is connected to one side thereof; It is characterized in that it comprises a bracket that is provided with a displacement to the vertical direction while being coupled to prevent the mutual rotation as an element for fixing the coupler to the motor.

As a preferable feature of the present invention, the lifting screw shaft is formed in a position opposite to the threaded portion and the screw portion is fastened to the rotor, one side is open and a skirt in which the striking pin is projected at an eccentric position in the axis to one side of the inner circumference And a bearing provided in an outer circumferential surface of the skirt portion and an inner space of the coupler.

In another preferred aspect of the present invention, the coupler is formed in the inner space into which the skirt is inserted so that the stop pins collide with the hitting pin during rotation of the lifting screw shaft is formed so that the extended end of the valve pin can be fitted Pin fastening slide groove is formed on one side.

Hot runner valve device for injection molding machine according to the present invention, if the rotor of the forward and reverse motor to rotate in the no load state in order to move to the relative position in the state in which the valve pin is raised or lowered, the lifting screw shaft is screwed to this After one rotation interlocking, one end (hit pin) hits one side (stop pin) of the coupler to which the valve pin is connected to generate a collision force, and at the same time suppresses the rotation of the elevating screw shaft, and consequently receives the valve pin from the stop state. In addition to overcoming the stop resistance (frictional resistance due to supporting elements such as bushings that support the valve pins and frictional resistance when they are inserted into the outlet), it is possible to have a vertical displacement to ensure stable lifting operation of the valve pins. That has a useful effect.

In addition, since the structure can be simplified, it can be applied to a compact mold for molding small and precision parts, and can increase the degree of freedom in designing the mold according to the nozzle position.

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 this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best describe their own invention. Based on the principle that the present invention should be interpreted in a sense consistent with the technical spirit of the present invention.

1 is a cross-sectional view schematically showing a hot runner valve device for an injection molding machine using a pneumatic pressure according to the prior art,
2 and 3 are cross-sectional views for explaining the falling and the rising state of the valve pin in the hot runner valve device for injection molding machine according to the first embodiment of the present invention,
4 and 5 are cutaway perspective views illustrating the main components of FIGS. 2 and 3;
6 and 7 are perspective views for explaining the coupling relationship between the lifting screw shaft and the coupler according to the present invention;
8 is a cutaway perspective view showing a hot runner valve device for an injection molding machine according to a second embodiment of the present invention;
FIG. 9 is an exploded perspective view showing the main components of the hot runner valve device for an injection molding machine of FIG. 8; FIG.
10 and 11 are cross-sectional views illustrating the lowering and the rising state of the valve pin in the hot runner valve device for an injection molding machine according to the third embodiment of the present invention;
12 and 13 are cutaway perspective views illustrating the main components of FIGS. 10 and 11;
14 and 15 are exploded perspective views exploded in the main part configuration in the present embodiment,
16 to 18 are perspective views for explaining the coupling configuration of the elevating screw shaft and the coupler in the present embodiment,
19 is a plan view for explaining the striking process during the operation of the motor in the present embodiment.

Hereinafter, a hot runner valve device for an injection molding machine according to the present invention will be described with reference to the accompanying drawings. First, it should be noted that the same components or parts among the drawings are denoted by the same reference numerals as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Figure 2 is a cross-sectional view for explaining the lowering state of the valve pin in the injection molding machine hot runner valve apparatus according to the first embodiment of the present invention, Figure 3 is a valve pin in the injection molding machine hot runner valve apparatus according to the present invention It is sectional drawing for demonstrating a rising state.

4 is a cutaway perspective view for explaining the state of FIG. 2, and FIG. 5 is a cutaway perspective view for explaining the state of FIG. 3.

Finally, Figure 6 is an exploded perspective view showing the main components of the hot runner valve device for injection molding machine according to the present invention, Figure 7 is to explain the operation configuration of the main configuration of the hot runner valve device for injection molding machine according to the present invention For perspective view.

As shown therein, the hot runner valve device 1 for an injection molding machine of the present invention has a nozzle 10 for injecting resin into a cavity (molding space) of a mold (not shown), and the nozzle 10 is A manifold 20 having a resin flow passage 22 formed therein to guide the branch by receiving resin from an injection cylinder (not shown) by being connected and mounted, and installed at one side of the manifold 20 to supply power from the outside. And a forward / reverse motor 30 which lifts and lowers the valve pin 15 passing through the resin furnace 12 formed at the center of the nozzle 10, and controls the opening and closing of the gate of the nozzle 10, that is, the outlet. .

The manifold 20 is provided in a plate shape made of a metal material, and a resin flow passage 22 through which the liquid resin in the molten state is moved is branched therein. The heater 20h, which is a heating element, is embedded along the resin flow passage 22, and the heater 20h prevents the resin flowing along the resin flow passage 22 from solidifying. Play a role. Referring to the manifold 20 of this configuration, the forward and reverse motors 30, which are driving means for raising and lowering the valve pin 15 provided in the nozzle 10, are installed on the upper side, and downward. The nozzle 10 is provided to receive the resin via the resin flow passage 22 and to inject into the cavity of the mold (not shown). Since the manifold 20 of such a structure is implemented by a well-known technique, detailed description is abbreviate | omitted.

The nozzle 10 has a tubular body 11 having a hollow cylindrical shape, and the heater 10h, which is a heating element, is wound around the outer circumferential surface of the body 11. The nozzle 10 has a resin path 12 penetrating through the center of the body 11, and the end portion thereof is processed into a cone shape, and a gate (unsigned), that is, an outlet, for discharging the resin is formed. That is, the body 11 of the nozzle 10 has a resin channel 12 connected to the resin channel 21 of the manifold 20 described above as an inner center, and is formed at the center of the resin channel 12. The valve pin 33 is provided to be elevated. Here, the valve pin 15 is provided with a rod having a smaller diameter than the inner diameter of the resin furnace 12 so that the resin can flow around the upper end portion of the valve pin 15 passes through the manifold 20. By being connected to the reverse motor 30, the lift operation is performed to open and close the outlet. Since the nozzle 10 of such a configuration is also implemented by a known technique similarly to the manifold 20, a detailed description thereof will be omitted. However, in the nozzle 10 of the present invention, the valve pin 15 forms a head portion 15h having an enlarged diameter of the upper end portion, and the head portion 15h has a lower portion of the coupler 37 to be described later. It is assembled and connected to the fitting groove (37s ″) by slide fitting.

The forward / reverse motor 30 is fixedly installed on the upper side of the manifold 20 to generate a driving force for elevating the valve pin 15. The stator 32 and the rotor (receive power from the outside) As the rotor 33 rotates through the interaction of 33), the lifting screw shaft 35 in a state where the screw is screwed therein is interlocked and the lifting operation is performed. That is, the forward and reverse motors 30 are formed on an inner circumferential surface of the case 31 and the inner inner circumferential surface of the case 31 to form an outer body. The rotor 33 is formed of a tubular magnet in which a plurality of magnetic poles are alternately magnetized along the circumferential surface by forming an electromagnetic force by interaction by being disposed with a gap in the inner circumferential surface of the 32 and the rotor 33 Lift screw shaft 35 is screwed to the inner circumferential surface of the) and the coupler 37 which is an element for connecting the lift screw shaft 35 and the valve pin 15. Among the elements constituting the forward / reverse motor 30, the stator 32 and the rotor 33 are implemented by known techniques, and thus detailed description thereof will be omitted.

As shown in the drawing, the lifting screw shaft 35 has a threaded portion (unsigned) having a threaded line formed on its outer circumferential surface and is screwed with a spiral portion (unsigned) formed on the inner circumferential surface of the rotor 33, and the lower end thereof. The structure is connected to the upper end of the valve pin 15 through the coupler 37. The lifting screw shaft 35 can be rotated integrally in conjunction with the rotation of the rotor 33, but the rotation is suppressed after approximately one rotation by the structure of the blow pin (35a) and the stop pin (37a) to be described later This results in a vertical displacement. That is, the lifting screw shaft 35 starts to rotate in conjunction with the rotation of the rotor 33, the stop pin of the coupler 37, which will be described later by the blow pin 35a protruding on one side before turning one wheel. In contact with 37a, rotation is suppressed. Therefore, as the rotor 33 rotates while the lifting screw shaft 35 is suppressed from rotation, the lifting screw shaft 35 is positioned in a vertical direction, that is, the lifting operation is performed.

On the other hand, in the present invention, the lifting screw shaft 35 is provided with upper and lower rolling members (35b1, 35b2) of the ball (ball) for rolling contact respectively on the upper and lower surfaces. To this end, the present invention is the upper ball groove (35h1) is formed on the upper surface of the lifting screw shaft 35, the upper cloud member (35b1) is provided in the interior of the upper ball groove (35h1). At this time, the upper cloud member (35b1) is part of the upper fitting groove (37s') is provided so as to make a cloud contact to one side of the inner wall surface of the case (31). Further, the lifting screw shaft 35 has a lower fitting groove 37s ″ formed on a lower surface thereof, and a lower rolling member 35b2 serving as a concrete is housed inside the lower fitting groove 37s ″. At this time, the lower rolling member 35b2 is in contact with the upper fitting groove 37s ′ of the coupler 37 by being partially exposed from the lower fitting groove 37s ″.

The lifting screw shaft 35 having such a configuration is able to minimize frictional resistance with the counterpart parts because the upper and lower rolling members 35b1 and 35b2 provided at the upper and lower surfaces thereof are in rolling contact with each other.

The coupler 37, as shown in the figure, is provided with a cylindrical member, each end of the elevating screw shaft 35 and the valve pin 15 in a direction orthogonal to the lifting direction, that is, the side by sliding the fitting The slide fitting grooves 37s' and 37s ″ are respectively formed to be assembled. The coupler 37 is characterized by including a stop pin 37a as an element for receiving collision energy while suppressing rotation of the lifting screw shaft 35. That is, the stop pin 37a of the coupler 37 collides with the striking pin 35a of the lifting screw shaft 35 to generate collision energy and transfer it to the valve pin 15, resulting in the valve pin ( The stop resistance acting on 15) is eliminated. In the present invention, it is proposed that one stop pin 37a is formed on one side of the upper surface of the coupler 37, but two may be formed at intervals.

On the other hand, the coupler 37 in the present invention is preferably provided with a material having a low thermal conductivity so that the heat transmitted to the valve pin 15 can be prevented from being transferred to the lifting screw shaft (35). In addition, since the coupler 37 serves to connect the shaft and the shaft may be variously implemented by a known technique.

When the current is applied from the outside to the stator 32 made of the excitation coil from the outside, the electromagnetic force is generated between the rotor and the rotor 33 which is a magnet provided on the inner circumferential surface. As the rotor 33 rotates in the forward and reverse directions about the stator 32 by the electromagnetic force at this time, the lifting screw shaft 35 screwed to the inner circumferential surface of the rotor 33 is integrally formed. The rotation will begin.

At this time, the lifting screw shaft 35 is rotated by being caught by the stop pin (37a) at the time of making about one revolution in conjunction with the rotation of the rotor 33, so the lifting As the screw shaft 35 is prevented from rotating and the rotor 33 rotates, the lifting screw shaft 35 is moved up and down in a vertical direction, that is, in an up and down direction.

On the other hand, reference numeral 40 denotes a bushing connecting the forward and reverse motor 30 and the manifold 20, wherein the bushing 40 of the motor 30 and the manifold 20 Since the watertightness of the connecting portion is ensured by a known technique, detailed description thereof will be omitted.

Referring to the operation of the hot runner valve device for injection molding machine according to the present invention configured as described above are as follows.

2 and 4 show a state in which the valve pin 15 is lowered to block the gate of the nozzle 10, and when the power is applied to the forward / reverse motor 30 in this state, the rotor 33 is When the one-way rotation starts, the lifting screw shaft 35 connected to the inner circumferential surface of the rotor 33 by screwing also starts to rotate in conjunction with the rotor 33. Subsequently, before the lifting screw shaft 35 starts to rotate and reaches one rotation, the striking pin 35a provided on one side of the lifting screw shaft 35 contacts the stop pin 37a of the coupler 37, thereby preventing the rotation operation. Accordingly, the lifting screw shaft 35 is not rotated together with the rotor 33 so that the lifting screw shaft 35 has a vertical displacement in the upward direction by the screw fastening structure.

On the other hand, the collision energy is generated when the striking pin 35a of the lifting screw shaft 35 collides with the stop pin 37a when the valve pin 15 is lifted up, and the collision energy is the stop pin 37a. The valve pin 15 is delivered to the valve pin 15 as a result, and the valve pin 15 receives the collision energy caused by the collision of the striking pin 35a and the stop pin 37a to overcome the stop resistance and move upward. As shown in FIG. 3 and FIG. 5, the outlet of the nozzle 10 is opened to allow resin to be moved along the resin path 12 to be injected into the cavity of the mold.

3 and 5 illustrate a state in which the valve pin 15 moves upward to open the gate of the nozzle 10. In this state, power is applied to the forward / reverse motor 30 so that the rotor 33 may be rotated. When the reverse rotation starts, the lifting screw shaft 35 connected to the inner circumferential surface of the rotor 33 by screwing is also linked to the rotor 33 to start the reverse rotation.

Subsequently, before the lifting screw shaft 35 starts to rotate and reaches one rotation, the striking pin 35a provided on one side of the lifting screw shaft 35 contacts the stop pin 37a of the coupler 37, thereby preventing the rotation operation. Accordingly, the lifting screw shaft 35 is not rotated together with the rotor 33 and has a vertical displacement in the downward direction.

On the other hand, during the lowering operation of the valve pin 15, collision energy is generated when the striking pin 35a of the lifting screw shaft 35 collides with the stop pin 37a, and this collision energy is a stop pin 37a. The valve pin 15 is transmitted through the valve pin 15, and as a result, the valve pin 15 receives the collision energy caused by the collision of the striking pin 35a and the stop pin 37a to overcome the stop resistance and move downward. As shown in FIG. 2 and FIG. 4, the outlet of the nozzle 10 is shielded to prevent the resin moving along the resin path 12 from being injected into the cavity of the mold.

As described above, in the present invention, in the state in which the valve pin 15 is moved up or down, the resin is filled in the resin furnace 12 and receives a stop resistance due to contact with each component. At the time when the rotation of the rotor 33 is interlocked, the impact pin 35a collides with the stop pin 37a to generate collision energy, and the collision energy is converted into the valve pin 15. To stop the elimination of the stop resistance. In addition, the lifting screw shaft 35 has a rolling member (35b1, 35b2) to minimize the frictional resistance with the target member in contact with the upper and lower surfaces.

8 is a cutaway perspective view showing another embodiment of the hot runner valve device for an injection molding machine according to the second embodiment of the present invention, Figure 9 is an exploded perspective view showing the main configuration of the present embodiment.

As shown in this figure, the main components of the hot runner valve device for an injection molding machine in the present embodiment are the same. Therefore, in the following description of the configuration of the hot runner valve device for an injection molding machine according to the present embodiment will be omitted for the same parts as in the above-described embodiment. Referring to the drawings, the hot runner valve device 1 for an injection molding machine according to the present embodiment is a lifting screw shaft 35 having a screw part 35s screwed to a motor by performing a rotational motion in a forward / reverse direction. The technical feature of the present invention is to provide a coupler 38 that prevents damage due to friction while reducing the rotational load by preventing the lower surface from rubbing with other components. That is, the coupler 38 in this embodiment is largely comprised of the main coupler 38a, the clearance bearing 38b, and the sub coupler 38c.

The main coupler 38a is provided on the inner circumferential surface of the cooling block 50 so as not to rotate so as not to flow in the rotational direction. Here, the cooling block 50 is for cooling the heat generated by the motor 30 is provided in a tubular shape of the center empty and the cooling water line 51 is circulated to flow the cooling water supplied from the outside into the inside Is formed. Meanwhile, the cooling block 50 according to the present invention forms a groove (not shown) having a shape corresponding to the flow preventing groove 38ah ′ having a semicircular groove shape on the outer surface of the main coupler 38a. In addition, a flow preventing pin 38f is inserted into the cylindrical groove to prevent the cooling block 50 and the coupler 37 from flowing in mutual rotation directions.

In addition, the main coupler 38a has a through hole 38ah formed in a vertical direction, and the through hole 38ah is a hole through which one end of the lifting screw shaft 35 is inserted. Since the lower end of the elevating screw shaft 35 is provided to have an expanded diameter, when assembled, the lower end of the elevating screw shaft 35 is inserted into the upper side from the lower side of the main coupler 38a, and the lower end of the elevating screw shaft 35 is expanded in the upper direction. Is prevented.

In addition, the main coupler 38a is a slide fastening groove 38as to allow the gap retaining bearing 38b and the sub coupler 38c, which will be described later, to be laterally orthogonal to the lower side in a direction orthogonal to the lifting direction. Is formed. At this time, both sides of the slide fastening groove (38as) is formed with a step (38as') in a direction facing each other.

The clearance bearing 38b is a ball bearing having an inner ring and an outer ring. The gap retaining bearing 38b is fixed to the outer circumferential surface of the outer ring by fitting inside the slide fastening groove 38as, and one end of the elevating screw shaft 35 is fitted to the inner circumferential surface of the inner ring.

On the other hand, the gap retaining bearing 38b is prevented from being separated by a snap ring (sr), for this purpose, the lifting screw shaft 35 is prevented from being separated in the assembly direction in the state where the gap retaining bearing 38b is assembled. A snap ring groove (unsigned) into which the snap ring sr is fitted is formed.

The sub coupler 38c is slide-fitted into the slide fastening groove 38as of the main coupler 38a to be constrained to prevent flow in up and down directions, and is coupled to and supported by the gap retaining bearing 38b at the upper center thereof. A gap groove 38cs for forming a gap with a lower surface of the lifting screw shaft 35 is formed, and both sides of the gap groove 38cs and the step 38as' of the slide fastening groove 38as are provided. A rail portion 38ca is assembled to fit. In addition, the sub-coupler 38c has a pinned slide groove 38cd in which the head 15h of the valve pin 15 slides in a lateral direction that is perpendicular to the lifting direction.

The sub coupler 38c having such a configuration is coupled to the main coupler 38a together with the gap retaining bearing 38b in a state where the upper part thereof is assembled by slide fitting into the slide fastening groove 38as of the main coupler 38a. As the lower surface of the fixed elevating screw shaft 35 is not in contact, surface damage due to frictional contact is prevented without causing a rotational load due to friction during rotation of the elevating screw shaft 35.

The assembling state of the coupler 37 of the present embodiment configured as described above will be described with reference to FIG. 7 as follows.

The main coupler 38a constituting the coupler 37 in this embodiment is assembled in a structure in which rotation is prevented inside the cooling block 50. In addition, one end of the elevating screw shaft 35 is inserted into the through hole 38ah vertically penetrating the center thereof, and the elevating screw shaft 35 at this time has a gap maintaining bearing composed of inner and outer rings at one lower end thereof. 38b is fitted.

The rail fastening groove 38as provided at the lower portion of the main coupler 38a is slide-fitted to the rail portion 38ca of the sub coupler 38c, and a pin fastening slide groove is formed on the upper surface of the sub coupler 38c. The lower surface of the elevating screw shaft 35 is formed with a gap g formed on one surface of the pin fastening slide groove 38cd of the sub-coupler 38c. That is, the lifting screw shaft 35 has its lower end rotated and supported by the slide fastening groove 38as of the main coupler 38a by the gap retaining bearing 38b, and the lower surface thereof has a gap between the sub coupler 38c and the gap ( g).

The hot runner valve device 1 for an injection molding machine having the coupler 37 composed of the main coupler 38a, the gap retaining bearing 38b, and the sub coupler 38c having such a configuration is a valve according to the embodiment described above. Since the valve pin is raised and lowered by the same action as the device, a detailed description thereof will be omitted.

10 is a cross-sectional view showing a valve pin is lowered, that is, a gate closed state in the hot runner valve device for an injection molding machine according to a third embodiment of the present invention, Figure 11 is a state in which the valve pin is raised to open the gate It is sectional drawing shown. 12 and 13 are perspective views showing the main parts of FIGS. 10 and 11, respectively.

14 and 15 are exploded perspective views illustrating the assembling configuration of the motor, the lifting screw shaft and the coupler, and FIGS. 16 to 18 are perspective views illustrating the coupling structure of the lifting screw shaft and the coupler in the present embodiment. 19 is a plan view for explaining a striking process during motor operation in the present embodiment.

As shown in this figure, the hot runner valve device for an injection molding machine in this embodiment is similar to the configuration of the first embodiment described above. Therefore, in the following description of the configuration of the hot runner valve device for an injection molding machine according to the present embodiment, the same parts as those in the above-described embodiment will be omitted, and the same reference numerals are used for the same working components. Grant.

Referring to the drawings, the hot runner valve device 1 for an injection molding machine according to the present embodiment is a lifting screw shaft 35 having a screw part 35s screwed to a motor by performing rotational motion in a forward and reverse direction. And a coupling structure of the coupler 39 into which a part of the elevating screw shaft 35 is inserted, thereby simplifying the structure.

As shown in the drawing, the elevating screw shaft 35 has a threaded portion 35s formed with a screw thread on an upper outer circumferential surface thereof, and a spiral portion formed on an inner circumferential surface of the rotor 33 that is an element constituting the motor 30. And a screw), and a lower end thereof is connected to the upper end of the valve pin 15 through the coupler 39. The lifting screw shaft 35 may be integrally rotated in conjunction with the rotation of the rotor 33, but less than approximately one rotation by the structure of the hitting pin 35a and the stop pin 39a to be described later. The rotation is suppressed at, resulting in vertical displacement. That is, the lifting screw shaft 35 starts to rotate in conjunction with the rotation of the rotor 33, the stop pin of the coupler 39, which will be described later by the hitting pin 35a protruding on one side before turning one wheel. The rotation is limited by contact with (39a), and as a result, the lifting screw shaft 35 is rotated as the rotor 33 is rotated while the lifting screw shaft 35 is suppressed from rotating. Positional displacement in the vertical direction, that is, the lifting operation is to be made.

This configuration is similar to that of the embodiment described above. However, the elevating screw shaft 35 in the present embodiment is formed with a skirt portion 35u having a lower surface open while the lower end thereof is extended in a cylindrical shape, and a bearing br is fitted on the outer circumferential surface of the skirt portion 35u. do. At this time, the bearing br is an element that enables the relative rolling motion of the outer surface of the skirt portion 35u and the inner surface of the coupler 39 to be described later. That is, the lifting screw shaft 35 in the present embodiment, as shown in the figure, is screwed to the rotor 33 of the motor 30 to form a screw thread on the upper outer peripheral surface based on the drawing to receive the rotational driving force One threaded portion 35s is provided, and below the threaded portion 35s, a skirt portion 35u with a lower surface opened is formed.

At this time, the skirt portion (35u) is provided with a bearing (br) on the outer circumferential surface, the present invention proposes a structure in which the first and second bearings (b1, b2) are fitted at the upper and lower sides of the skirt portion (35u), respectively. It was.

In more detail, the skirt portion 35u has upper and lower bearing fitting portions 35ub1 and 35ub2 so that each of the first and second bearings b1 and b2 may be fitted at upper and lower sides thereof. The protrusion 35up is provided between the upper and lower bearing fitting portions 35ub1 and 35ub2. In addition, the upper bearing fitting portion 35ub1 is fitted with a second snap ring s2 at a position in contact with an upper surface of the first bearing b1 so that the upper bearing fitting portion 35ub1 is not separated upward when the first bearing b1 is fitted. The second snap ring groove 35sh is formed, and the lower surface of the first bearing b1 is limited in contact with the protrusion 35up by moving downward. And the second bearing (b2) is limited to the upper flow by the upper surface is in contact with the protrusion 35up, the lower surface is in contact with the bottom surface of the coupler 39 to be described later the flow is limited.

On the other hand, in the lifting screw shaft 35, the skirt portion (35u) is formed integrally projecting the striking pin (35a) on the inner circumferential surface, the striking pin (35a) at this time is the stop pin of the coupler 39 to be described later ( Contact force 39a) to generate a collision force.

The coupler 39 is provided with a cylindrical member having an open top surface, and the stop pin 39a protrudes from the bottom surface so as to collide with the striking pin 35a formed on the skirt portion 35u of the lifting screw shaft 35. Is formed.

In addition, the coupler 39 is formed with a first snap ring groove 39sh into which the first snap ring s1 is fitted into the upper inner circumferential surface, wherein the first snap ring s1 is an inner space 39uh of the coupler 39. In contact with the upper edge of the first bearing (b1) fitted to the upper outer peripheral surface of the skirt portion (35u) to prevent the separation in the state in which the skirt portion (35u) of the elevating screw shaft 35 is fitted in the prevent.

On the other hand, the bottom surface of the coupler 39 is provided so that the bottom portion of the second bearing (b2) is in contact with the second bearing (b2) contact, that is, the bottom edge portion protrudes, the stop pin ( 39a) is formed to protrude at a position that does not interfere with the second bearing b2.

In addition, the coupler 39 has a pinned slide groove 39cd in which the head portion (unsigned) of the valve pin 15 slides in a horizontal direction that is perpendicular to a vertical direction in a lifting direction. do.

On the other hand, the coupler 39 in the present embodiment is formed of a material having a low thermal conductivity so that the heat transmitted to the valve pin 15 can be prevented from being transferred to the lifting screw shaft 35 and the motor 30 side. desirable.

The coupler 39 of this configuration eliminates the stop resistance acting on the valve pin 15 by generating collision energy before the lifting screw shaft 35 is about one rotation when the motor 30 is driven.

The coupler 39 generates a collision energy by hitting the stop pin (35a) formed on the bottom surface side hitting the pin 35a of the elevating screw shaft (35), resulting in the transfer to the valve pin (15) The stop resistance acting on the valve pin 15 is removed.

On the other hand, the coupler 39 is fixed to the motor 30 by a bracket (ca) having a through hole formed in the center, the bracket (ca) at this time as shown in the drawing and the lifting screw shaft 35 and It enables the lifting operation of the coupler 39 and prevents the motor from being separated from the motor 30.

That is, the coupler 39 has a flange portion 39f having an upper portion extended outward based on the drawing, and a semi-circular flange pin groove 39h is formed at the edge side of the flange portion 39f. The pin groove 39h corresponds to the bracket pin groove c1h formed on the inner circumferential surface of the annular first bracket c1 constituting the bracket ca, thereby preventing rotation of the pin groove 39h.

In detail, the bracket ca may have a ring-shaped first bracket c1 coupled to and fixed to one side of the motor 30, and the first bracket c1 in a state where the coupler 39 is fitted. It consists of a ring-shaped second bracket (c2) coupled integrally with. Here, the first bracket c1 has a semicircular bracket pin groove c1h corresponding to the semicircular flange pin groove 39h formed in the flange portion 39f of the coupler 39 on the inner circumferential surface thereof, and these flange pin grooves ( The coupler 39 is prevented from flowing in the rotational direction by the fitting pin p being fitted into the circular groove formed by 39h) and the bracket pin groove c1h.

On the other hand, the coupler 39 is a flange portion (39f) having an expanded diameter with respect to the body is assembled to the flange mounting step portion (c2p) of the second bracket (c2) the coupler 39 is a flange portion ( The upper surface of 39f) coincides with the upper surface of the second bracket c2. In addition, although not illustrated, the first bracket c1 and the second bracket c2 are fixed to the motor 30 through a screw member.

By this configuration, the coupler 39 is coupled to the first bracket c1 and the fixing pin p so that the rotation is prevented so that the skirt portion 35u of the elevating screw shaft 35 is inserted into the inner space 39uh. ) Has a structure that does not rotate rotationally integrally.

Accordingly, when the rotor 33 of the motor 30 rotates, the lifting screw shaft 35 screwed thereto is integrally interlocked to achieve rotation. At this time, the skirt portion 35u of the elevating screw shaft 35 is rotated inside the coupler 39, and the rotation is prevented while the impact pin 35a collides with the stop pin 39a of the coupler 39. While raising the coupler 39, the collision force is transmitted to the valve pin 15 through the coupler 39, the stop resistance acting on the valve pin 15 is removed.

On the other hand, reference numeral 40 denotes a bushing connecting the forward and reverse motor 30 and the manifold 20, wherein the bushing 40 of the motor 30 and the manifold 20 Since the watertightness of the connecting portion is ensured by a known technique, detailed description thereof will be omitted.

The present invention having the above configuration is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

1 valve device 10 nozzle 11 nozzle body
12: resin 15: valve pin 15h: head
20: manifold 22: resin flow path 30: motor
31 case 32 stator 33 rotor
34: bearing 35: lifting screw shaft 35a: striking pin
37: coupler 37a: stop pin 37s ′: upper fitting groove
37s ″: lower groove 40: bushing 38: coupler
39: coupler

Claims (7)

It is coupled to one side of the manifold 20 receives the resin and the inside of the nozzle 10 is provided with a valve pin 15 for opening and closing the gate by the lifting operation, and is coupled to the other side of the manifold 20 Rotor 33 is rotated by the interaction with the stator under the power supply and has a vertical displacement by screwing to the inner circumferential surface of the rotor 33, one end is connected to the valve pin 15 and the coupler 37 In the hot runner valve device for injection molding machine comprising a motor (30) having a lifting screw shaft (35),
The lifting screw shaft 35 has a striking pin 35a protruding from one end thereof, and the coupler 37 suppresses the rotation of the striking pin 35a when the lifting screw shaft 35 is rotated, thereby raising the lifting screw shaft 35. Hot runner valve device for injection molding machine, characterized in that the stop pin (37a) is protruded to have a vertical displacement.
2. The hot runner valve device for injection molding machine according to claim 1, wherein the elevating screw shaft (35) is provided with upper and lower rolling members (35b1, 35b2) in the form of balls for upper and lower surfaces respectively. .
The slide fitting groove of claim 1, wherein the coupler 37 slides one end of each of the lifting screw shaft 35 and the valve pin 15 in a direction perpendicular to the lifting direction. A hot runner valve device for an injection molding machine, characterized in that (37s', 37s ″) is formed.
The method of claim 1, wherein the coupler,
A through hole 38ah in which one end of the elevating screw shaft 35 is inserted in the center is vertically penetrated, and the lower side is stepped in a direction facing each other so as to slide in a lateral direction orthogonal to the elevating direction. A main coupler 38a having a slide coupling groove 38as provided with a 38as';
A gap retaining bearing 38b in which an outer circumferential surface of an outer ring is fitted into the slide fastening groove 38as, and one end of an elevating screw shaft 35 is fitted into an inner circumferential surface of the inner ring;
A space groove for clearance that forms a gap with a lower surface of the elevating screw shaft 35 that is slide-fitted into the slide fastening groove 38as and is constrained in the up and down direction and coupled to the gap retaining bearing 38b at an upper center thereof. A sub-coupler 38c having a 38c formed therein and having a pinned slide groove 38cd at which one end of the valve pin 15 slides downward in a lateral direction;
Hot runner valve device for injection molding machine comprising a.
In the hot runner valve device for injection molding machine in which the valve pin is raised and lowered by the driving force of the motor,
A nozzle 10 coupled to one side of the manifold 20 to receive the resin and having a valve pin 15 at the inner center thereof to open and close the gate by a lifting operation;
The rotor 33 is coupled to the other side of the manifold 20 receives the power supply and is rotated by the interaction with the stator and the other end is screwed to the inner peripheral surface of the rotor 33 to have a vertical displacement It includes a lifting screw shaft 35 is a blow pin (35a) protruding;
A stopper 39a which selectively collides with the striking pin 35a protrudes into an inner space in which one end of the elevating screw shaft 35 is inserted, and a coupler 39 having one end of the valve pin 15 connected to one side thereof. )Wow;
A bracket (ca) provided with a component for fixing the coupler (39) to the motor (30) so as to be mutually prevented from rotation and fitted in a vertical direction;
Hot runner valve device for injection molding machine comprising a.
The method of claim 5, wherein the lifting screw shaft 35,
A screw portion 35s fastened to the rotor 33 and a skirt portion 35u having one side open and an impact pin 35a protruding at an eccentric position from one axis to an inner circumferential surface thereof are formed at positions opposite to the screw portion 35s. And a bearing (br) provided in the outer circumferential surface of the skirt portion (35u) and the inner space of the coupler (39).
The stopper 39a of claim 6, wherein the coupler 39 protrudes from the impact pin 35a when the lifting screw shaft 35 is rotated in an internal space into which the skirt portion 35u is inserted. And, the hot runner valve device for injection molding machine, characterized in that the pinned slide groove (39cd) is formed on one side so that the extended end of the valve pin (15) can be fitted.

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