KR100860139B1 - Hot runner valve system for injection molding - Google Patents

Abstract

The present invention discloses a hot runner valve device for an injection molding machine.

The present invention is a hollow tubular member which is opened up and down, and is defined as a cylinder housing having a rotational restriction rib protruding from which an air channel for supplying and discharging working pressure is formed on one side of an inner circumferential surface thereof, and a hollow member installed inside the cylinder housing. Upper and lower flanges and upper and lower flanges contacting the inner wall surface of the housing at upper and lower intervals so as to rotate forward and reverse by the operating pressure supplied through the reverse air channel to form a space in which the operating pressure stays. A vertically connected flange is provided with a barrier wall selectively contacting both sides of the rotary limiting rib and a guide protrusion rotator protruding from one side of the inner circumferential surface thereof, and a lift pin fitted to the inside of the rotator. The lifting member is a lifting shaft including a lifting shaft in which a spiral lifting guide spiral groove is inserted into the outer peripheral surface of the guide projection In this configuration, the rotator rotates in the forward and reverse directions by the operating pressure selectively supplied through the forward and reverse air channels, thereby elevating the lifting shaft and the valve pin connected thereto. Vibration characteristics can be improved, which provides an advantage of reducing component damage.

Hot Runner, Manifold, Nozzle, Valve Pin, Pneumatic

Description

Hot runner valve system for injection molding

1 is a cross-sectional view showing an injection molding machine valve device for a multi-cavity mold according to the prior art;

Figure 2 is a cross-sectional view for explaining the lowering operation of the valve pin in the valve device according to the invention,

3 is a plan sectional view for explaining an operation state of the driving means in FIG.

Figure 4 is a cross-sectional view for explaining the lifting operation of the valve pin in the valve device according to the invention,

5 is a plan sectional view for explaining an operation state of the driving means in FIG.

Figure 6 is an exploded perspective view showing the main configuration of the valve device according to the present invention,

7 is a partial cutaway perspective view showing the assembled state of FIG.

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

1: Valve device 3: Manifold

3p: Resin Channel 5: Nozzle

5p: resin flow 5h: coil heater

7 valve pin 10 drive means

11 cylinder housing 11a top cover
11b: main body 11c: lower cover

13: Rotator 13a, 13b: Upper and lower flange

13d: barrier 13f: guide protrusion

15: lifting shaft 15a: lifting guide spiral groove

15h: Flow preventing horizontal groove a1, a2: Air channel

b1, b2: bearing c1, c2: working pressure residence space

p1, p2: Packing ring

The present invention relates to a hot runner valve device for an injection molding machine, and more particularly, to improve the structure of the driving means for providing lifting force to the valve pin by using hydraulic pressure and pneumatic pressure to minimize the impact force generated when generating the lifting force. The present invention relates to a hot runner valve device for an injection molding machine capable of extending the life and increasing the reliability of the operation.

In general, a hot runner valve device for an injection molding machine is a device that receives resin from an injection molding machine that melts resin and injects the resin into a cavity of the mold. The hot runner valve device is configured to open and close a gate by a lifting operation of a valve pin. Depending on the number of molded articles, a relatively large number is formed into a manifold type receiving resin through a manifold, and a single type receiving resin from a cylinder when producing a single product.

1 illustrates a configuration of a valve device for elevating a valve pin by using high pressure air as a working pressure according to the prior art, wherein the valve device is a manifold valve device applied to a multi-cavity mold.

As shown in the related art, a hot runner valve device for a conventional injection molding machine is largely composed of a driving means 100 and a valve device 200, and typically uses high pressure air as a driving source for the lifting operation of the valve pin 210.

That is, the driving means 100 has a plurality of air channels (110, 120), which are pipes for supplying and discharging high-pressure air from the outside, are formed through a plurality of air channels (110, 120) The piston 140 in the cylinder 130 is elevated by the high pressure air or fluid introduced into the structure. 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 formed with a resin channel 230 with a predetermined gap around the valve pin 210, the both ends of the resin channel 230 is the resin of the gate of the nozzle and the manifold 300 Each structure is connected to the channel 310.

Hot runner valve device for injection molding machine configured as described above when the high pressure working pressure is selectively supplied through the air channel (110,120), the piston 140 makes the lifting or lowering, 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 into the cylinder 130 through the corresponding air channels (110, 120), At this time, in conjunction with the piston 140, the valve pin 210 opens and closes the gate of the nozzle.

However, the conventional hot runner valve device for an injection molding machine configured as described above has a problem in that the piston 140 is lifted and collides with the inner upper and lower walls of the cylinder 130, resulting in adverse effects on the entire valve device. .

That is, the impact force generated when the piston 140 is raised and lowered primarily acts directly on the cylinder 130 and the piston 140 to cause deformation and breakage of these components.

In particular, the cylinder 130 has a gas tight structure to block the leakage of the operating pressure is provided in the form of a combination of several members to install the piston therein, the impact force with the piston 140 is repeatedly applied When fatigue accumulates, the bonding between the members is greatly degraded, resulting in poor airtightness, which results in leakage of working pressure, which is a problem in that the reliability of the operation is greatly reduced.

In addition, the impact force transmitted to the piston 140 is transmitted as it is to the valve pin 210 coupled in a form extending perpendicularly thereto, the valve pin 210 at this time the front end surface of the mold and the selective operation during the downward movement As a result, the secondary impact with the mold is caused by the impact force.

Therefore, such a collision not only causes deformation of the valve pin 210 but also damages the expensive mold, thereby causing a serious problem of economic loss.

The present invention has been made to solve the above problems, an object of the present invention is to provide a lifting force of the valve pin through the rotational movement by receiving the operating pressure to configure the driving means to the vibration caused by the impact and damage to the parts It is an object of the present invention to provide a hot runner valve device for an injection molding machine.

Another object of the present invention is to provide a hot runner valve device for an injection molding machine, which can increase the reliability of the operation by suppressing the flow of the valve pin in the vertical direction in the lifted position.

The hot runner valve device for an injection molding machine according to the present invention for realizing the above object is provided with a manifold having a branched resin channel for injecting a water support material into a cavity of a mold, and installed on one side of the manifold. Drive means for generating the lifting force by receiving the pressure and the valve is installed on the other side of the manifold to form a resin flow path connected to the resin channel and in the inner center connected to one end of the drive means to open and close the gate In a hot runner valve device for an injection molding machine composed of a nozzle having a pin, the driving means is a hollow tubular member which is opened up and down and rotates with an air channel for supplying and discharging the working pressure on one side of the inner circumferential surface thereof. A cylinder housing protruding the restricting rib; Upper and lower spaces which are installed inside the cylinder housing and are spaced up and down as a hollow member which is rotated forward and backward by the operating pressure and whose outer peripheral surface is in contact with the inner wall of the housing to form a space where the operating pressure stays. A rotator comprising a flange, a barrier wall in surface contact with the rotary limiting rib by vertically connecting these upper and lower flanges, and a guide protrusion protruding from one side of the inner circumferential surface; It is characterized in that it comprises an elevating shaft formed with a spiral elevating guide spiral groove is inserted into the rotator so that the elevable member and the lower end thereof is a elevating member to which the valve pin is connected, the guide projection is inserted into the outer circumferential surface.

As a preferable feature of the present invention, the cylinder housing has a container shape of which the lower part is open, and a through hole through which one end of the lifting shaft is inserted is formed in the center of the upper surface, and an inner circumferential surface is provided with a bearing for rotationally supporting the upper outer circumferential surface of the rotator. The upper cover and a tubular member integrally coupled to the lower side of the upper cover, the main body having a larger inner diameter than the upper cover, and integrally coupled to the lower side of the main body, the inner peripheral surface has a lower outer peripheral surface of the rotator The lower cover is provided with a bearing for supporting the rotation.

As another preferable feature of the present invention, a packing ring is provided between the inner circumferential surface of the cylinder housing and the outer circumferential surface of the upper and lower flanges of the rotator.

As another preferred feature of the present invention, the lifting shaft includes a flow preventing horizontal groove extending in the horizontal direction at the upper and lower ends of the lifting guide spiral groove so that the flow in the vertical direction is suppressed when the guide protrusion is entered. It is to be configured.

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 conform to the technical idea of the present invention on the basis of 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, a preferred embodiment of a hot runner valve device for an injection molding machine according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing the lowering operation of the valve pin in the valve device according to the present invention, Figure 3 is a plan sectional view for explaining the operating state of the drive means in FIG. 4 is a cross-sectional view illustrating the operation of raising the valve pin in the valve device according to the present invention, and FIG. 5 is a plan cross-sectional view illustrating an operation state of the driving means in FIG. 4.

Finally, Figure 6 is an exploded perspective view showing the main configuration of the valve device according to the present invention, Figure 7 is a partially cut perspective view showing the assembled state of FIG.

As shown in the figure, the hot runner valve device 1 for an injection molding machine of the present invention is largely installed inside the manifold 3 and the nozzle 5 and the nozzle 5 to open and close the gate. It consists of a valve pin 7 and a drive means 10 for transmitting a lifting force to the valve pin 7.

Manifold (3) is a plate member made of metal, a resin supply port (not shown) for receiving the resin is formed on one side, the inside is for moving the supplied support material in a molten state The resin channel 3p is formed to branch.

In addition, a heater wire (not shown), which is a heating element that generates heat at a predetermined temperature by power supply, is prevented on the upper and lower surfaces of the manifold 3 to prevent the resin moving along the resin channel 3p from solidifying. It is a structure that is buried.

As shown in the drawings, the manifold 3 configured as described above has a driving means 30 for elevating the valve pin 25 upwards and a plurality of nozzles for supplying resin to the lower side. 5) is mounted by a known technique as a structure for mounting, detailed description thereof will be omitted.

The nozzle 5 is a member having a tubular shape with an empty inside, and a resin flow passage 5p connected to the resin channel 3p of the manifold 3 is formed at an inner center thereof, and the resin flow passage 5p is a nozzle. It is connected to the resin discharge port formed at the tip of (5), that is, the gate (unsigned). Here, the gate is tapered to reduce the diameter while proceeding downward as a member in contact with one end of a mold (not shown) for molding an injection molded product. Such a gate may be integrally formed with the nozzle 5 or may be processed by a separate member to be combined with a screw fastening structure.

In addition, the nozzle 5 has a configuration in which a coil heater 5h in the form of a wire is wound in order to prevent the resin passing through the resin flow passage 5p on its outer circumferential surface from being solidified. In this case, the coil heater 5h is Like the heater wire of the manifold described above, power is supplied from the outside to generate heat at a predetermined temperature.

The nozzle 5 configured as described above has a valve pin 7 of a length member having a smaller diameter than the inner diameter of the resin flow passage 5p formed at the center thereof, and the resin around the valve pin 7 at this time To allow the flow. In addition, one end of the valve pin 7 is connected to the driving means 10 installed on the upper side of the manifold 3 to receive a lifting force to open and close the gate of the nozzle 5.

In addition, since the nozzle 5 and the valve pin 7 of the above structures may be implemented by a well-known structure, detailed description is abbreviate | omitted.

The drive means 10 is a device for providing lifting force to the valve pin 7 installed inside the nozzle 5, the cylinder housing 11 forming an outer body, and the interior of the cylinder housing 11 It is composed of a rotator 13 is installed in the rotator 13 is rotated a predetermined angle in the forward or reverse direction by receiving the operating pressure of the high-pressure air and the lifting shaft 15 is installed in the rotator 13 and selectively lifted.

The cylinder housing 11 is a member having a hollow tubular shape with open upper and lower surfaces, and a pair of air channels a1 and a2 are predetermined so as to receive an operating pressure of high-pressure air therein. It is formed at intervals, one side of the inner circumferential surface of the rotation limiting rib (11b ') having a predetermined thickness is formed, the rotation limiting rib (11b') at this time is a rotator having a blocking wall (13d) to be described later ( 13) to limit the rotation.

That is, the cylinder housing 11 is formed with one inlet and outlet of air channels a1 and a2 on one side of the outer surface in order to receive the working pressure, and the inner limiting surface of the cylinder housing 11 has a rotary limiting rib to discharge the supplied working pressure in opposite directions. 11b '), the other side entrance and exit ports of the air channels a1 and a2 are respectively formed.

Since the rotator 13 and the valve pin 7 and the like are configured in the cylinder housing 11 having such a configuration, it is preferable that the cylinder housing 11 is constituted by various members for good assembly.

As an example, the cylinder housing 11 in the present invention proposes that the upper cover 11a, the main body 31, and the lower cover 11c are provided in a stack-coupled form. That is, the upper cover 11a is provided in a container shape with an open lower portion, and the upper surface center forms a through hole (unsigned) of a predetermined size so that the upper end of the lifting shaft 15 is fitted. The lifting shaft 15 protrudes upwardly through the through hole of the upper cover 11a during the upward movement.

The upper cover 11a of this configuration is provided with an upper bearing b1 for rotationally supporting the upper outer circumferential surface of the rotator 13 on the inner circumferential surface, and the upper bearing b1 at this time may be proposed in various forms. Sliding bearings are preferably used.

In addition, the main body 11b is a member having a hollow tubular shape with open upper and lower surfaces, and is formed to have a larger inner diameter, that is, an expanded inner diameter than the inner diameter of the upper cover 11a.

And the lower cover (11c) is a tubular member that is located on the lower side of the main body (11b) is configured to be coupled, the inner circumferential surface is provided with a lower bearing (b2) similar to the upper cover (11a), the lower bearing ( b2) rotates and supports the lower outer circumferential surface of the rotator 13.

Although not illustrated, the cylinder housing 11 configured as described above may be integrally formed by the upper cover 11a, the main body 11b, and the lower cover 11c being coupled to each other in a screwing structure.

The rotator 13 is a rotating member installed in the above-mentioned cylinder housing 11 to selectively rotate in the forward or reverse direction by the operating pressure.

The rotator 13 has upper and lower flanges 13a and 13b formed on the outer circumferential surface at predetermined intervals, and the upper and lower flanges 13a and 13b have a plate member having a predetermined thickness. As a result, the space c in which the working pressure stays is formed by being provided to contact the inner wall surface of the cylinder housing 11 described above. In addition, the upper and lower flanges 13a and 13b are vertically connected to the blocking wall 13d, wherein the blocking wall 13d is selectively in surface contact with both side surfaces of the above-mentioned rotational restriction rib 11b '. As a result, the rotation of the rotator 13 is stopped.

That is, the upper and lower flanges 13a and 13b are spaced apart from each other at predetermined intervals, and the working pressure staying space c, which is a closed space by contacting the inner circumferential surface of the cylinder housing 11 with the inner wall surface, is formed. On one side of the closed space, a rotation limiting rib 11b 'protruding from one side of the inner wall of the cylinder housing 11 is located. At this time, the rotary limiting rib (11b ') is formed in the air channel (a1, a2) in the direction opposite to each other on the working pressure retention space (c), as shown in the figure, each of these air channels ( The rotator 13 is rotated in the forward and reverse directions by the operating pressure flowing into the staying space c selectively through a1 and a2.

Here, supplying the working pressure into the cylinder housing 11 through the air channels a1 and a2 or converting the working pressure filled in the cylinder housing 11 to be exhausted is similar to a known technique. Therefore, detailed description is omitted.

Meanwhile, a guide protrusion 13f having a predetermined diameter is integrally formed on one side of the inner circumferential surface of the rotator 13, and the guide protrusion 13f at this time is predetermined along the outer circumferential surface of the lifting shaft 15 to be described later. Lifting induction is formed in a spiral while having an inclination angle is inserted into the spiral groove (15a) to perform the lifting induction of the lifting shaft (15).

The rotator 13 configured as described above is provided on the other side when the working pressure is supplied to the inside of the staying space c through the air channel a1 on one side in a state rotatably provided in the cylinder housing 11 described above. The air channel a2 is kept open so that atmospheric pressure is applied.

Therefore, the rotator 13 is divided into two spaces by the rotation limiting rib 11b 'and the blocking wall 13d. As a result, the rotator 13 is selectively selected through one air channel a1 and the other air channel a2. The operating pressure supplied is to make the forward or reverse rotation.

The lifting shaft 15 is a tubular member that is slideably fitted into the rotator 13 as described above, and the lower end thereof is connected to each other by screwing so that the lower end is integrally connected with the upper end of the valve pin 7. Or it may be connected by welding or fitting structure, which may be carried out by a known technique, so detailed description thereof will be omitted.

Meanwhile, the elevating shaft 15 has a spiral elevating guide spiral groove 15a having a predetermined inclination angle on an outer circumferential surface thereof, and the elevating guide spiral groove 15a is at one side of the inner circumferential surface of the rotator 13. The protruding guide protrusion 13f is a portion to which the slide is fitted.

When the working pressure is supplied to the above-mentioned staying space c by this configuration, the rotator 13 generates guide force 13f formed on one side of its inner circumferential surface by generating a rotational force to rotate in one direction. The elevating oil also moves along the spiral groove 15a, and as a result, the elevating shaft 15 is moved up or down.

On the other hand, the lifting shaft 15 in the present invention is formed at the top and bottom end of the lifting guide spiral groove (15a) is formed with a horizontal flow preventing horizontal groove (15h), such a flow preventing horizontal groove ( 15h) is to allow the valve pin 7 to be suppressed from flowing in the vertical direction in a completely raised or lowered state.

That is, the flow preventing horizontal groove (15h) is a groove extending in the horizontal direction at the uppermost end and the lowermost end of the elevating guide spiral groove (15a) having an inclination angle, respectively, the guide projection (13f) It is prevented from flowing in the vertical direction in the state.

Therefore, the lifting shaft 15 is suppressed in the vertical direction by the guide projection 13f and the flow preventing horizontal groove 15h at the maximum rising and falling positions, which results in the valve pin 7 being gated. It is stably prevented from flowing in the vertical direction by an external force in an open or closed state.

Reference numerals p1 and p2 denote well-known packing rings that are airtight members provided between the inner circumferential surface of the cylinder housing 11 and the outer circumferential surfaces of the upper and lower flanges 13a and 13b of the rotator 13. As shown in the drawing, the packing rings p1 and p2 are provided on the inner circumferential surface of the cylinder housing 11 and the outer circumferential surfaces of the upper and lower flanges 13a and 13b of the rotator 13, respectively. A groove (unsigned) to be fitted is formed to increase the positional stability of the packing rings p1 and p2.

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

First, the opening operation of the nozzle 5 will be described with reference to FIGS. 2 and 3.

As shown in the figure, in the state in which the valve pin 7 descends to shield the gate of the nozzle 5, one of the air channels (a1, a2) formed in the cylinder housing 11 (hereinafter, For convenience of explanation, the working pressure is supplied to the inside of the cylinder housing 11 through the 'forward air channel a1', and the other air channel (hereinafter referred to as 'forward air channel a2') is provided. Rotation of the rotator 13 in a clockwise direction so that internal air or working pressure can be exhausted to the outside, that is, atmospheric pressure is applied.

That is, the operating pressure supplied through the forward air channel a1 is located on the left side of the stay space c divided into two by the rotation limiting rib 11b 'and the blocking wall 13d. It is supplied to a space (hereinafter referred to as 'positive stay space c1' for convenience of description), and the reverse air channel a2 is in a state in which atmospheric pressure is applied, that is, a state in which the pipe is open, so that the rotator 13 is supplied with an operating pressure. Positive retention space (c1) located on the side of the direction is expanded to rotate the rotator 13 in the clockwise direction.

Subsequently, as the rotator 13 rotates in a clockwise direction, the lifting shaft 15 provided with a slide fitting on the inner circumferential surface thereof moves up and down, wherein the lifting shaft 15 has a lifting induction spiral groove 15a formed on the outer circumferential surface thereof. Since the guide projection 13f of the rotator 13 slides into the structure of the rotator 13, the lifting shaft 15 is moved up and down by rotating the rotator 13 clockwise as a result. As the valve pin 7 connected to the lower end of the 15 moves up in unison, the gate of the nozzle 5 is opened.

Next, the shielding operation of the nozzle 5 will be described with reference to FIGS. 4 and 5.

As shown in the figure, in the state in which the lifting shaft 15 moves upward together with the valve pin 7, the operating pressure is supplied to the reverse air channel a2 of the air channels a1 and a2, and at the same time, the forward air When the channel a1 is switched to the open state, the operating pressure is supplied to the staying space located on the right side of the staying space c (hereinafter referred to as 'reverse stay space c2' for convenience of description). The rotator 13 rotates counterclockwise by the expansion of the reverse residence space c2.

Accordingly, the lifting shaft 15 provided on the inner circumferential surface of the rotator 13 moves downward, and the valve pin connected thereto also descends by integrally closing the gate of the nozzle 5.

On the other hand, the lifting shaft 15 is a flow preventing horizontal groove (15h) is formed in the horizontal direction along the outer circumferential surface at the upper and lower ends of the elevating induction spiral groove (15a), the flow preventing horizontal groove ( 15h) prevents flow in the vertical direction in the state where the guide protrusion 13f of the rotator 13, which is the rotating member, enters, thereby consequently operating pressure when the valve pin 7 is raised or lowered. Even if it is released, it is prevented from flowing in the vertical direction.

Finally, the present invention is not limited to the described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Therefore, such modifications or variations will have to belong to the claims of the present invention.

The hot runner valve device for the injection molding machine configured and operated as described above, because the rotator rotates in the forward and reverse directions by an operating pressure selectively supplied through the forward and reverse air channels, thereby elevating the lifting shaft and the valve pin connected thereto. Compared with the conventional one, it is possible to improve vibration characteristics due to impact, thereby providing an advantage of reducing component damage.

In addition, the lifting shaft in the flow preventing horizontal groove formed horizontally extending at the upper and lower ends of the elevating induction spiral groove, the flow in the vertical direction is suppressed when the guide projection of the rotator is entered to improve the sense of theft and stability of the lifting operation of the valve pin. This guarantees an industrially beneficial effect of significantly increasing the reliability of the device.

Claims (4)

A manifold with branched resin channels for injecting water support into the cavity of the mold, drive means for generating lifting force by supplying working pressure to one side of the manifold, and on the other side of the manifold In the hot runner valve device for an injection molding machine comprising a nozzle having a valve pin for forming a resin flow path connected to the resin channel and connected to one end of the driving means in the inner center thereof to open and close the gate by being linked up and down, The driving means includes a cylinder housing having a rotational restriction rib protruding as a hollow tubular member which is opened up and down and has a pair of air channels for supplying and discharging the working pressure on one side of the inner circumferential surface thereof; A hollow member installed inside the cylinder housing and spaced up and down as a hollow member which is rotated forward and backward by the operating pressure, and having an outer circumferential surface contacting the inner wall surface of the cylinder housing to form a space where the operating pressure stays. A rotator comprising a lower flange, a barrier wall in surface contact with the rotary limiting rib by vertically connecting these upper and lower flanges, and a guide protrusion protruding from one side of the inner circumferential surface; An elevating shaft having a helical elevating guide spiral groove having a guide protrusion inserted into an outer circumferential surface thereof as an elevating member having an elevable fitting fitted into the rotator and having a lower end thereof connected to a valve pin; Hot runner valve device for injection molding machine comprising a. The method of claim 1, wherein the cylinder housing, An upper cover having a container shape having an open lower portion and having a through hole through which one end of the lifting shaft is inserted in the center of the upper surface, and an inner circumferential surface provided with a bearing for rotationally supporting the upper outer circumferential surface of the rotator; A main body having a larger inner diameter than the upper cover with a tubular member integrally coupled to a lower side of the upper cover; A lower cover which is integrally coupled to the lower side of the main body, and has an inner circumferential surface provided with a bearing for rotationally supporting the lower outer circumferential surface of the rotator; Hot runner valve device for injection molding machine, characterized in that consisting of. 2. The hot runner valve apparatus for injection molding machine according to claim 1, wherein a packing ring is provided between the inner circumferential surface of the cylinder housing and the outer circumferential surface of the upper and lower flanges of the rotator. According to claim 1, The lifting shaft is configured to include a flow preventing horizontal groove extending in the horizontal direction at each end of the upper and lower ends of the elevating induction spiral groove to suppress the flow in the vertical direction when the guide projection is entered. Hot runner valve device for injection molding machine, characterized in that.

Images