KR102381355B1 - Cylinder system with adjustable height of valve pin - Google Patents

Abstract

The present invention relates to a cylinder system with an adjustable height of a valve pin without disassembly. The cylinder system with an adjustable height of a valve pin without disassembly according to an embodiment of the present invention comprises: a housing having a flow path therein so that molten resin injected from the outside can flow through a gate into which molten resin is injected, formed on an upper part of a manifold having a nozzle formed on a lower part thereof, and having a hollow part therein; a piston formed in the hollow part, provided with an upper end of a valve pin at an inner center part, and reciprocating up and down by a working fluid introduced into the hollow part; a cylinder cover spaced apart from an upper part of the housing and having an opening formed in the center; and a middle cover for height adjustment, in which an upper center part is fastened to the opening in a screw manner, and a lower outer part is fixed to the upper surface of the housing to elevate and lower the housing through a rotational drive.

Description

Cylinder system with adjustable height of valve pin without disassembling {CYLINDER SYSTEM WITH ADJUSTABLE HEIGHT OF VALVE PIN}

The present invention relates to a cylinder for a hot runner system. More particularly, it relates to a cylinder for moving a valve pin for filling a cavity by injecting a molten resin into an injection mold.

In general, an injection mold refers to an apparatus for mass-producing plastic products by injecting and filling a molten resin (hereinafter, 'molten resin') into a cavity configured therein.

A hot runner system is one of injection that supplies molten resin to the injection mold during injection molding. Refers to a system for high-pressure injection into the

For example, in such a hot runner system, the molten resin can be stably supplied to the injection mold side through several points in a molten state during injection molding, so that precision molding can be performed even when the temperature of the molten resin is low or the injection pressure is low.

Here, in the hot runner system, a flow channel through which the molten resin flows is formed inside the manifold to uniformly supply the molten resin to the cavity side of the mold through the flow path, and a nozzle for discharging the molten resin. and a valve pin and a cylinder driving the valve pin.

On the other hand, the valve pin of the hot runner system interlocks with a piston configured inside the cylinder to move up and down within the nozzle, thereby injecting molten resin into the injection mold to fill the cavity.

Here, the valve pin of the hot runner system may have different heights depending on the assembly tolerance of the cylinder. can

As an example, if the heights of the valve pins composed of at least two or more in the hot runner system are different in order to cope with the multi-gate of the injection mold, there may be a deviation in the injection amount of the molten resin, which results in deterioration of the molding quality. Since it acts as a factor that induces

In other words, in order to uniformly inject molten resin into the multi-gate of the injection mold to form a high-quality molded product, it is a priority to adjust the height of the valve pin so that the height of the valve pin does not differ from each other. .

However, the cylinder of the hot runner system according to the prior art is a configuration in which the height of the valve pin can be adjusted only by disassembling the cylinder cover exposed to the outside. Considering that, effective height adjustment has not been reached.

For example, even if the cylinder cover is disassembled and the height of the valve pin is uniformly adjusted, there may be a difference in the height of the valve pin depending on tolerances generated in the process of reassembling the cylinder cover. The height of the valve pin is different.

In addition, disassembling and assembling the cylinder cover for adjusting the height of the valve pin may cause oil leakage due to the characteristics of the cylinder driven by hydraulic pressure or pneumatic pressure, and may be a factor in shortening the life of the parts in the long term.

Republic of Korea Patent Publication No. 10-1336279

An object of the present invention is to provide a cylinder system in which the height of the valve pin can be adjusted without disassembly, so that the height of the valve pin can be easily adjusted without disassembling the cylinder cover through structural improvement.

In order to achieve the above task,

The cylinder system capable of adjusting the height of the valve pin without disassembling according to an embodiment of the present invention has a flow channel inside so that the molten resin injected from the outside can flow through the gate into which the molten resin is injected. and a housing (Housing) configured on the upper part of a manifold (Manifold) having a nozzle (Nozzle) at the lower part, and having a hollow part therein;

a piston configured in the hollow portion, having an upper end of a valve pin in the inner center portion, and reciprocating up and down by the working fluid introduced into the hollow portion;

a cylinder cover configured to be spaced apart from the upper portion of the housing and having an opening formed in the center thereof; and

A middle cover for adjusting the height of the upper center part is fastened to the opening in a screw type, and the outer part of the lower part is fixed to the upper surface of the housing and elevating the housing through rotational driving;

may include

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembly according to an embodiment of the present invention, the pin disk is configured in the inner space of the piston to prevent the valve pin from being separated from the piston (Pin Disk); and

a screw holder fastened to the upper part of the piston in a screw method to fix the upper end of the valve pin;

may further include.

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembling according to an embodiment of the present invention, the cylinder cover is first accommodated in the lower portion to accommodate the bolt head for mutually fastening the intermediate cover for height adjustment and the housing. space can be configured.

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembling according to an embodiment of the present invention, the cylinder cover has one or more bolt fastening holes so that the height-adjusted intermediate cover for adjusting the height can be fixed with a headless bolt. can be configured.

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembling according to an embodiment of the present invention, the intermediate cover for height adjustment has a second accommodation space on the upper surface of which the lower end of the tanning bolt faces, and the second A protrusion may be configured in the lower portion of the cylinder cover to correspond to the receiving space.

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembling according to an embodiment of the present invention, a polygonal fastening space can be configured in the upper center of the intermediate cover for height adjustment to enable rotational driving through a hexagon wrench. there is.

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembly according to an embodiment of the present invention, the cylinder cover is configured with scales arranged along the circumference on the surface, and a reference display is provided at the upper center of the intermediate cover for height adjustment. can be configured.

In addition, in the cylinder system capable of adjusting the height of the valve pin without disassembly according to an embodiment of the present invention, a CPS pin guide bush configured on the upper portion of the manifold to guide the elevation of the valve pin; and

a CPS ring configured on the outside of the CPS pin guide bush;

may further include.

These solutions will become more apparent from the detailed description for carrying out the following invention based on the accompanying drawings.

Prior to this, the terms or words used in the present specification and claims should not be construed in their ordinary and dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it is possible.

According to an embodiment of the present invention, it is possible to easily adjust the height of the valve pin from the outside of the mold without disassembling the cylinder cover, thereby easily solving the problem of different heights between the valve pins in the hot runner system. there is.

In addition, according to an embodiment of the present invention, it is possible to effectively improve the reliability of a hot runner system to which the maintenance convenience and durability thereof are improved by improving the structure of the cylinder system.

1 is a cross-sectional view showing an internal structure of a cylinder system capable of adjusting the height of a valve pin without disassembly according to an embodiment of the present invention;
Figure 2 is a perspective view showing a cylinder system capable of adjusting the height of the valve pin without disassembly according to an embodiment of the present invention.
3 and 4 are cross-sectional views showing enlarged main parts of a cylinder system capable of adjusting the height of a valve pin without disassembly according to an embodiment of the present invention.
5 is a perspective view showing an enlarged main part of a cylinder system capable of adjusting the height of a valve pin without disassembly according to an embodiment of the present invention of FIG. 5 .
6 is a plan view showing a cylinder system in which the height of the valve pin can be adjusted without disassembly according to FIG. 5 when viewed from above.

The specific aspects and specific technical features of the present invention will become more apparent from the following detailed description and embodiments in conjunction with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When a component is described as being “connected”, “coupled” or “connected” to another component, the component may be directly connected to or connected to the other component, but another component is between each component. It should be understood that elements may also be “connected,” “coupled,” or “connected.”

Hereinafter, an embodiment of the present invention will be described in detail based on the accompanying drawings.

1 to 2, in the cylinder system (hereinafter referred to as 'cylinder system') capable of adjusting the height of the valve pin without disassembly according to an embodiment of the present invention, the molten resin is discharged from the outside through the gate. On the other hand, the molten resin is uniformly distributed through the flow path 1a, which is a kind of passage through which the molten resin flows, and is configured on the upper part of the manifold 1 to supply it to the nozzle 2 at the bottom, and the valve pin 4 is operated by hydraulic or pneumatic pressure. It moves up and down in the nozzle (2).

To this end, the cylinder system 3 is configured on the upper part of the manifold 1, the housing 10 provided with a hollow part 11 into which the working fluid flows, and the hollow part 11 is accommodated and configured. A piston 20 having a valve pin 4 provided at the lower portion and reciprocating up and down by hydraulic or pneumatic pressure by the working fluid flowing into the hollow part 11 through the fluid transfer line 101 of the mold 100 and It includes a cylinder cover 30 which is configured to be spaced apart from the upper portion of the housing 10 and has an opening 31 formed in the center thereof.

In addition, the upper center part 51 is fastened to the opening 31 of the cylinder cover 30 by a screw method, and the outer part of the lower end is fastened and fixed to the upper surface of the housing 10 by a bolt method, and the housing ( 10) includes an intermediate cover 50 for height adjustment for elevating.

Here, the cylinder cover 30 is a first in the lower part to accommodate the height adjustment intermediate cover 50 and the bolt head for coupling the housing 10 to each other protrude from the upper surface of the height adjustment intermediate cover 50. The accommodation space 34 may be configured.

In addition to this, a pin disk 22 configured in the inner space 21 of the piston 20 to prevent the valve pin 4 from being separated from the piston 20 and a screw method on the upper part of the piston 20 It may further include a screw holder 23 for fixing the upper end of the valve pin (4) through the fastening. The screw holder 23 may be referred to as a set screw.

Furthermore, two bolt fastening holes 32 in the drawing are configured in the cylinder cover 30 so that the height-adjusted intermediate cover 50 for adjusting the height can be fixed with the headless bolt 32a, that is, a headless bolt. The middle cover 50 for height adjustment of the second accommodating space 52 in which the lower end of the tanning bolt 32a is accommodated may be configured.

According to FIG. 3 , that is, by screwing the hairless bolt 32a into the bolt fastening hole 32 and lowering the lower end to face the second receiving space 52 and fixing it, the height adjustment intermediate cover 50 of loosening can be prevented.

Returning to the manifold 1 again, the manifold 1 includes an external heater to easily maintain the molten state of the molten resin flowing along the flow path 1a as well as the flow path 1a. Components may be configured. Therefore, it should be clarified in advance that the configuration of the manifold 1 is not necessarily limited to the drawings.

In addition, in a hot runner system, the manifold 1 is generally disposed below the mold 100 , and the cylinder system 3 is configured in the mold 100 .

Here, in the hot runner system, a CPS pin guide bush (not shown) guiding the elevation of the valve pin 4 between the manifold 1 and the mold 100 and a CPS ring (not shown) installed outside thereof are interposed. can be configured.

The housing 10 is a kind of parent body constituting the cylinder system 3, is formed in a cylindrical cross-section, and is provided in the piston 20 and the inner center of the piston 20 through the hollow part 11 formed therein. It is configured so that the working fluid for reciprocating the piston 20 is introduced while accommodating the valve pin 4 reciprocally up and down.

Referring to FIG. 1 , a plurality of holes are machined on the side or below of the housing 10 in a gun-drilling manner so that the hollow part 11 and the fluid transfer line 101 communicate with each other. The reciprocating motion of the piston 20 may be made by hydraulic or pneumatic pressure.

The housing 10 has, for example, an O-ring between the housing 10 and the piston 20 and between the piston 20 and the screw holder 23 to prevent leakage of the working fluid. can be configured. In addition, the O-ring may be configured at various points where the leakage of the working fluid is expected, and may be configured as a single or a double.

The piston 20 accommodated in the hollow portion 11 of the housing 10 vertically reciprocates by hydraulic or pneumatic pressure to elevate the valve pin 4 provided in the inner center portion.

For example, the piston 20 and the valve pin 4 are a fastening structure, and constitute an annular pin disk 22 in the inner space 21 of the piston 20 so that the upper part of the valve pin 4 is caught and interrupted. By doing so, the separation of the valve pin 4 from the piston 20 is prevented, and the screw holder 23 is coupled to the upper center in a screw manner to fix the upper end of the valve pin 4 It can be configured there is.

However, this is an example for explaining the coupling structure of the piston 20 and the valve pin 4, and the structure for providing the valve pin 4 to the piston 20 is not necessarily limited thereto. make it clear

The upper part of the valve pin 4 that moves up and down in conjunction with the piston 20 is fastened to the piston 20, while the lower part is located in the nozzle 2 configured in the lower part of the manifold 1, and the molten resin is will eject

Here, the nozzle 2 is configured on the opposite side of the cylinder system 3, that is, under the manifold 1, and is filled by injecting molten resin into the cavity side of the injection mold.

Therefore, according to an embodiment of the present invention, the molten resin injected into the manifold 1 is supplied to the nozzle 2 while flowing along the flow path 1a formed inside the manifold 1, and the cylinder system ( By elevating the valve pin 4 through 3) and filling the cavity side of the injection mold, it is possible to mass-produce the molded product.

Hereinafter, the assembly method of the cylinder system 3 according to an embodiment of the present invention will be described in detail as follows.

For example, the assembly sequence of the cylinder system 3 according to an embodiment of the present invention is a valve in the upper portion of the pin disk 22 in a state in which the pin disk 22 is built in the inner space 21 of the piston 20 . By lowering the pin (4), the upper end of the valve pin (4) is interrupted, and the screw holder (23) is screwed onto the upper portion of the piston (20) to fix the valve pin (4).

Thereafter, in a state in which the piston 20 is assembled into the hollow part 11 of the housing 10 and built in, the intermediate cover 50 for height adjustment is bolted to the upper part of the housing 10 to be assembled.

In addition, the cylinder cover 30 is assembled on the upper part of the intermediate cover 50 for adjusting the height to constitute the cylinder system 3, and the cylinder system 3 is formed as a plate, an upper plate or an upper fixed plate. It is assembled in the interpretable mold 100 .

However, this is only an example of an assembly method for easy understanding of the cylinder system 3 according to an embodiment of the present invention, and may be easily implemented in other methods.

Therefore, it is stated in advance that the assembly order is not limited to the cylinder system 3 according to an embodiment of the present invention.

On the other hand, the valve pin 4 according to an embodiment of the present invention may have different heights depending on the assembly tolerance with the piston 20 or the tolerance occurring during the assembly of the cylinder system 3 , for example, the manifold If the heights of the valve pins 4 are different from each other under the configuration in which the cylinder system 3 and the nozzles 2 are provided in multiple in (1), a deviation may occur in the injection amount of the molten resin injected into the injection mold.

As an example, if there is a deviation in the injection amount of the molten resin, it acts as a factor causing deterioration of molding quality as a result, so it is necessary to adjust the height of the valve pin 4 to operate.

According to FIG. 4 , a gap G for height adjustment is formed between the housing 10 and the mold 100 according to an embodiment of the present invention through rotation of the intermediate cover 50 for height adjustment.

In other words, the height adjustment gap (G) may be interpreted as being formed between the cylinder cover 30 and the intermediate cover 50 for height adjustment. And by narrowing or widening the gap (G) for height adjustment through rotation of the intermediate cover for height adjustment (50), the height of the valve pin (4) is adjusted.

That is, for example, the cylinder cover 30 is fixed to the upper portion of the mold 100 constituting the hot runner system. And the housing 10 is installed to be lifted and lowered inside the mold 100 at a distance from the cylinder cover 30, and the cylinder cover 30 and the intermediate cover 50 for adjusting the height are fastened with a screw method. The intermediate cover 50 for height adjustment and the housing 10 are fastened by a bolt method.

5, the height adjustment intermediate cover 50 has a polygonal fastening space 50a implemented in a hexagonal shape so that the housing 10 can be raised and lowered through rotational driving in the form of a groove in the upper center part 51 The rotation driving is performed by inserting the hexagon wrench (L) into the fastening space (50a) and rotating it.

Here, a second accommodating space 52 is formed on the upper surface of the intermediate cover 50 for height adjustment so as to prevent the intermediate cover 50 for height adjustment from being arbitrarily driven by rotation, and is configured in the cylinder cover 30. A bolt fastening hole 32 to which the headless bolt 32a is screwed is configured.

That is, when the height adjustment of the valve pin 4 is completed by lowering the housing 10 through the rotational driving of the intermediate cover 50 for height adjustment, the headless bolt 32a is screwed into the bolt fastening hole 32. Thus, by accommodating the lower end of the second accommodating space 52 to prevent loosening of the intermediate cover 50 for height adjustment, the reliability related to the height adjustment of the valve pin 4 is improved.

According to FIG. 4 , when the height adjustment of the valve pin 4 is completed by a method of raising the housing 10 through rotation of the intermediate cover 50 for height adjustment, the cylinder corresponds to the second accommodation space 52 . By inserting the protrusion 33 configured in the lower part of the cover 30 into the second accommodating space 52, for example, to fit it tightly, the loosening phenomenon of the intermediate cover 50 for height adjustment together with the tanning bolt 32a is effectively prevented. can be prevented

According to FIG. 6, the cylinder cover 30 may be configured such that a scale 50b is arranged along the circumference on the surface, and a triangular reference display part 53 is configured on the intermediate cover 50 for height adjustment. Since the height of the pin 4 can be adjusted, there is ease of operation in terms of convenience.

For example, the scale 50b can raise and lower the valve pin 4 by 0.05 mm per square, and when the intermediate cover 50 for height adjustment is rotated 360°, the valve pin 4 is raised and lowered by about 1.0 mm.

Therefore, according to an embodiment of the present invention, the height of the valve pin 4 can be easily adjusted only by rotating and driving the intermediate cover 50 for height adjustment from the outside of the cylinder cover 30 without disassembling the cylinder system 3 . If possible, for example, when the height adjustment of the valve pin 4 is necessary in the process of supplying the molten resin through the hot runner system, the height of the valve pin 4 from the outside of the mold 100 without disassembling the cylinder system 3 can be easily adjusted, maintenance of the cylinder system 3 is easy and durability is improved, so that, for example, the replacement cycle of internal parts and the like can be extended.

Although the present invention has been described in detail through one embodiment, this is for describing the present invention in detail, and the cylinder system capable of adjusting the height of the valve pin without disassembling according to the present invention is not limited thereto. And, terms such as "include", "compose", or "have" described above mean that the corresponding component may be embedded unless otherwise stated, so excluding other components is It should be construed as being able to further include other components instead of it, and all terms including technical or scientific terms are generally understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise defined. has the same meaning as being

In addition, the above description is merely illustrative of the technical idea of the present invention, and various modifications and variations are possible by those of ordinary skill in the art to which the present invention pertains without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: Manifold 1a: Euro
2: Nozzle 3: Cylinder system
4: valve pin 10: housing
11: hollow part 20: piston
21: inner space 22: pin disk
23: screw holder 30: cylinder cover
31: opening 32: bolted hole
32a: headless bolt 33: protrusion
34: first accommodation space 50: middle cover for height adjustment
50a: fastening space 50b: scale
51: upper center 52: second accommodation space
53: standard display part 100: mold
101: fluid transfer line G: height adjustment gap
L: hexagon wrench

Claims (5)

a housing having a flow path configured therein so that the molten resin injected from the outside can flow through a gate into which the molten resin is injected, and configured in the upper part of the manifold including the nozzle at the bottom, the housing having a hollow inside;
a piston configured in the hollow portion, the upper end of the valve pin being provided in the inner center portion, and reciprocating up and down by the working fluid introduced into the hollow portion;
a cylinder cover configured to be spaced apart from the upper portion of the housing and having an opening in the center thereof; and
It includes a; an intermediate cover for height adjustment in which the upper center part is fastened to the opening in a screw method, and the outer part of the lower part is fixed to the upper surface of the housing and elevates the housing through rotational driving.
The cylinder cover is configured with one or more bolt fastening holes so that the height-adjusted intermediate cover for adjusting the height can be fixed with a headless bolt,
The intermediate cover for height adjustment has a second accommodating space on the upper surface where the lower end of the tanning bolt faces, and a protrusion corresponding to the second accommodating space is configured on the lower part of the cylinder cover, and the height of the valve pin can be adjusted without disassembly. .
The method according to claim 1,
a pin disk configured in the inner space of the piston to prevent the valve pin from being separated from the piston; and
a screw holder fastened to the upper part of the piston by a screw method to fix the upper end of the valve pin;
A cylinder system capable of adjusting the height of the valve pin without further disassembly.
delete delete The method according to claim 1,
The intermediate cover for adjusting the height is a cylinder system capable of adjusting the height of the valve pin without disassembling, the polygonal fastening space is configured in the upper center to enable rotation through a hexagon wrench.

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