WO2022154274A1

WO2022154274A1 - Polymer insulator injection mold and polymer insulator molding method using same

Info

Publication number: WO2022154274A1
Application number: PCT/KR2021/018778
Authority: WO
Inventors: 박춘현; 김규열
Original assignee: 주식회사 에이치엠
Priority date: 2021-01-14
Filing date: 2021-12-10
Publication date: 2022-07-21
Also published as: KR102429126B1; KR20220102727A

Abstract

The present invention relates to a polymer insulator injection mold and a polymer insulator molding method using same, the mold being capable of alleviating the core eccentricity of a polymer insulator and improving the productivity thereof through double injection. The present invention relates to the polymer insulator injection mold comprising an upper mold and a lower mold, wherein the upper mold and the lower mold include: reinforcing injected-object molding parts engaging with each other to mold, on a portion of a core accommodated therein, a reinforcing injected-object for reinforcing the diameter of the core; and housing molding parts which engage with each other to provide an accommodation space of a primarily molded core having the reinforcing injected-object, and which are for molding an insulated housing to encompass both a plurality of shed shapes and the accommodated primarily molded core, and an overflow line through which injected insulating materials communicate with each other is further included between the reinforcing injected-object molding part and the housing molding part.

Description

Polymer insulator injection mold and polymer insulator molding method using same

The present invention relates to a polymer insulator injection mold capable of improving the core eccentricity and productivity of the polymer insulator, and a molding method of the polymer insulator using the same.

In general, the polymer insulator is composed of a rod (rod) formed of fiberglass reinforced plastic (hereinafter referred to as 'FRP'), and has a structure surrounding the outer surface of the core with a polymer for insulating performance.

That is, a polymer for imparting insulation to the FRP rod for mechanical strength is injection-molded to ensure mechanical fixation as well as electrical stability when constructing power transmission and distribution lines.

On the other hand, the polymer insulator having the above function is made through a polymer insulator injection mold, and after the FRP rod is disposed inside the mold, silicon is injected into the cavity through the sprue, the runner and the gate and is molded.

At this time, the FRP rod disposed inside the mold is positioned at the center of the cavity without a support structure in a state in which both ends are fixed during molding.

Therefore, when excessive injection pressure is applied to the FRP rod, the silicone is crosslinked and molded without maintaining the straightness of the FRP rod, which may cause eccentricity of the FRP rod in the final product, a polymer insulator. have.

In addition, when a relatively long polymer insulator is formed, the frequency of occurrence of eccentricity problems in FRP rods is higher.

On the other hand, Republic of Korea Patent Registration No. 10-0140354 "Injection Mold of Polymer Insulator" discloses a technique for preventing the eccentricity of the FRP rod as described above.

1 is a view showing an injection mold of a polymer insulator according to the prior art, it is configured to support the FRP rod (5) using the support rod (10).

In detail, in the injection mold according to the prior art, the FRP rod 5 to which the bracket 2 is coupled to the end is disposed in the central part of the inner cavity 4 of the core mold 6 using the fixing part 3, and the hydraulic supply pipe (12) and the hydraulic cylinder (8) is used to extend the length of the support bar (10) is configured so that the lower part of the FRP bar (5) can be supported like the “A” part.

The support rod 10 may be respectively formed at a plurality of positions as shown in FIG. 1 , and for this purpose, a hydraulic cylinder 8 and a hydraulic pressure supply pipe 12 are further provided separately at each position.

On the other hand, when the rubber material is injected through the sprue 1 and the gate 13 in a state in which the FRP rod 5 is supported as described above, the support rod 10 directly supports the FRP rod 5, and thus the subsequent crosslinking is performed. And the straightness of the polymer insulator that has been molded can be maintained.

However, in the prior art as described above, as the support rod 10 for supporting the FRP rod 5 and hydraulic equipment for driving the support rod 10 are more required, the mold structure becomes complicated.

In addition, when the mold structure becomes complicated, it takes a lot of time to prepare for molding, so there is a problem in that productivity can be reduced during mass production.

It is an object of the present invention to provide a molding method of a polymer insulator in which the decrease in straightness can be prevented through double injection of the core.

Another object of the present invention is to provide a polymer insulator injection mold for the above molding method.

Another object of the present invention is to provide a polymer insulator injection mold capable of performing primary injection for reinforcing the core and secondary injection molding for forming an insulating housing on the primary injected core.

In the polymer insulator injection mold according to the present invention, an upper mold and a lower mold are molded to form a cavity, wherein the cavity is a reinforcing injection molding part for molding a reinforcing injection for reinforcing a core diameter in a part of a core accommodated therein; A housing molding unit for forming an insulating housing that provides a receiving space for the primary molding core in which the reinforcement injection is formed, and surrounds all of the reinforcement injection molding and the rest of the core together with a plurality of shed shapes in the received primary molding core. Separated, the reinforcing injection molding part and the housing molding part are arranged to be connected to form a pair, and a plurality of pairs of the reinforcement injection molding part and the housing molding part are provided.

In another aspect, the present invention relates to a polymer insulator injection mold comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are molded to each other to form a reinforcing injection molding that reinforces the core diameter in a portion of the core accommodated therein. A housing for molding an insulating housing to provide a reinforcing injection molding part and a primary molding core formed by molding the reinforcement injection molding with each other, and enclosing all of the primary molding core accommodated together with a plurality of shed shapes. A molding part is included, and an overflow line through which the injected insulating material communicates with each other is further included between the reinforcement injection molding part and the housing molding part.

The reinforcing injection molding part is characterized in that it is formed to have a length within a separation distance formed by a plurality of sheds formed in the housing molding part.

The housing molding part is characterized in that a gradient for preventing chewing of the parting line of the reinforcing injection formed on the primary molding core is formed.

The gradient is characterized in that the upper mold and the lower mold and the housing molding portion and each circumscribed two circles are determined as a point in contact with each other.

The upper mold is characterized in that one or more ejectors for assisting in separating the mold by using the elasticity of the spring are further provided.

The reinforcing injection molding part is characterized in that the inner space is formed to include a shed shape that is larger than the diameter of the reinforcement injection molding.

The overflow line is characterized in that it guides the insulating material overflowed by being injected into the housing molding part to the reinforcement injection molding part.

In another aspect, the polymer insulator molding method according to the present invention uses a polymer insulator injection mold in which a cavity formed by mixing an upper mold and a lower mold is divided into a reinforcement injection molding part and a housing molding part, and the reinforcement injection mold is formed by the lower mold A molding preparation step of arranging a core for forming a reinforcing injection product in a molding unit, and disposing a primary molding core having a reinforcement injection product formed therein in a housing molding unit formed by the lower mold, wherein the core and the primary molding core are disposed Insulation covering the primary molding core with a plurality of shed shapes by injecting an insulating material into the housing molding part formed by the upper mold and the lower mold through the molding step of molding the upper mold to the lower mold and the molding step The insulating material injected in the housing molding step and the insulating housing molding step overflows and is transferred to the reinforcing injection molding unit, and the reinforcing injection molding step in which the transferred insulating material is molded into the reinforcement injection molding part is included.

The polymer insulator injection mold according to the present invention molds a reinforcing injection molding so that a partial diameter of the core can be reinforced to prevent bending of the core, and an insulating housing is formed on the primary molding core on which the reinforcement injection is molded.

Accordingly, since the portion where the reinforcing injection is formed during the molding of the insulating housing can support the core in the molding space, the bending of the core is prevented, thereby preventing the deterioration of the straightness of the polymer insulator.

In addition, as the reinforcement injection molding part for molding the reinforcing injection molding part and the housing molding part for molding the insulation housing are connected to each other by an overflow line, the insulating material injected into the insulation housing overflows into the reinforcement injection molding part, and the reinforcement injection molding part overflows. Molding and molding of the insulating housing may be performed together.

That is, in the polymer insulator injection mold according to the present invention, the reinforcing injection product and the insulating housing are molded together in one mold, and the polymer insulator that has been manufactured is stored separately during demolding. In addition, the primary molding core on which the reinforcing injection is molded can be rearranged into the housing molding part of the mold, and a core for molding the reinforcing injection product is additionally disposed in the reinforcement injection molding part so that the molding operation can be performed continuously.

In addition, it has the advantage of improving the productivity of the polymer insulator while preventing the bending of the core as the molding operation as described above is made in plurality.

1 is a view showing an injection mold of a polymer insulator according to the prior art.

2 is a photograph showing an embodiment of an upper mold and a lower mold constituting a polymer insulator injection mold according to the present invention.

3 is a view for showing a silicone injection path of the polymer insulator injection mold according to the present invention.

4 is a view showing an embodiment of an overflow line connecting the housing molding part and the reinforcement injection molding part, which are the main parts of the present invention.

5 is a photograph showing a state in which an insulating housing and a reinforcing injection molded product are simultaneously molded using a polymer insulator injection mold according to the present invention.

6 is a photograph showing a state in which another embodiment of the reinforcement injection according to the present invention is arranged in a housing molding unit.

7 is a view for explaining the gradient of the molding part of the housing for preventing parting failure during molding of the reinforcement injection.

8 is a view showing an embodiment of an ejector for demolding a polymer insulator injection mold according to the present invention.

9 is a view for explaining the operation structure of the ejector shown in FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components in each drawing, the same components are denoted by the same reference numerals as much as possible even though they are indicated in different drawings. described. In addition, in the description of the embodiment, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the description is simplified or omitted, and a certain element is located on one side of another element. When it is described as “comprised”, “connected”, or “formed” with another component, the component may be provided or connected directly to one side of the other component, or may be formed of the mentioned configuration. , it should be understood that, between each component, another component may be “comprised” or “connected” or “formed” together with another component.

The polymer insulator injection mold according to the present invention is configured such that an upper mold and a lower mold are molded together to form a cavity, and a part of the step-by-step manufacturing process of the polymer insulator can be performed together in the cavity.

In detail, FIG. 2 is a photograph showing an embodiment of an upper mold and a lower mold constituting a polymer insulator injection mold according to the present invention, and FIG. 3 shows an insulating material injection path of the polymer insulator injection mold according to the present invention. A drawing is shown for

Referring to these drawings, in the upper mold 200 and the lower mold 400 according to the present invention, a reinforcing injection molding part ( 600) is formed.

In detail, the reinforcing injection molding part 600 is formed along the

core receiving parts

210 and 410 where the core is disposed, and in consideration of the length of the core, it is located at a position where deformation due to the injection pressure and weight of the insulating material is expected. can be formed.

In this embodiment to be described below, the reinforcement injection molding part 600 is formed in the central portion of the

core receiving parts

210 and 410, but when the length of the core increases, the formation position and number of the reinforcement injection molding part 600 is variable. can be In addition, the core on which the reinforcing injection is formed is divided into primary molded cores below for convenience of description.

On the other hand, one side of the reinforced injection molding part 600 is connected to the reinforcement injection molding part 600 and the overflow flow path 540 to form a pair of housing molding parts 800 are formed.

In addition, an ejector installation part 240 is further formed in the housing molding part 800 on the upper mold 200 side, so that an ejector to be described below may be installed. The description of the ejector and the formation position of the ejector installation part will be described in more detail with reference to other drawings below.

The housing molding part 800 provides an accommodation space for the primary molding core in which the reinforcing injection is formed by forming the upper mold 200 and the lower mold 400 together, and is accommodated together with a plurality of shed shapes. The insulating housing is molded to cover all the primary molded cores.

That is, in the molding space according to the present invention, the reinforcing injection molding part 600 for molding the primary molding core and the housing molding part 800 for forming the insulating housing are connected to each other to form a pair. In addition, as they are connected to each other through the overflow flow path 540 , molding of the reinforcing injection molding and molding of the insulating housing may be performed together when the insulating material is injected once.

In addition, the reinforcing injection molding part 600 and the housing molding part 800, which are paired as described above, are formed in a plurality of pairs so that a plurality of them can be molded at a time by one injection of an insulating material.

To this end, an injection path of an insulating material is separately injected through a plurality of branch passages in the injection mold of the polymer insulator according to the present invention.

Referring to FIG. 3 , the injection of the insulation material for forming the reinforcing injection material and the insulation housing is started through the main inlet 510 .

The insulating material injected into the main inlet 510 is again transferred to the divided area through the main input passage 520 , and the main input passage 520 guides the insulating material to each pair of housing forming parts 800 again. It is transferred to the area divided by the branch flow path 530 for

In the branch flow path 530 , the insulating material is transferred to the inlet 300 connected to each pair of the housing forming part 800 , and the insulating material supplied through the inlet 300 is first filled in the housing forming part 800 . .

On the other hand, the housing forming unit 800 is provided with a shed forming unit 820 for forming the above-described plurality of shed shapes, and an overflow flow path 540 is provided at one side of the shed forming unit 820 . The insulating material that overflows while filling the shed molding part 820 into the reinforcement injection molding part 600 is transferred.

4 is a view showing an embodiment of an overflow line connecting the housing molding part and the reinforcing injection molding part, which are the main parts of the present invention.

For reference, the housing forming part 800 includes a core forming part 840 in which the primary forming core is accommodated and a plurality of shed forming parts 820 protruding in a shed shape to the outside of the core forming part 840 . ), and one side of the shed molding part 820 closest to the reinforcement injection molding part 600 among the plurality of shed molding parts 820 is connected to the overflow flow path 540 .

Here, the overflow flow path 540 may be configured to be connected to the upper and lower ends of the reinforced injection molding part 600 , respectively, so that the inflow of the insulating material can be made more smoothly.

On the other hand, the reinforced injection molding part 600 is formed to have a length within a separation distance formed by the plurality of shed molding parts 820 .

That is, the reinforcing injection product is formed to a length that can be positioned inside the core molding part 840 between the two shed molding parts 820 . In addition, the reinforcing injection product formed as described above is formed in a band shape in consideration of the overall length of the core, and as the core load is distributed and supported at the corresponding position, the bending phenomenon of the core can be prevented.

5 is a photograph showing an insulating housing and a reinforcing injection molded together using a polymer insulator injection mold according to the present invention.

When the insulating material is injected into the reinforcement injection molding part 600 and the housing molding part 800, as shown in FIG. 5, the primary molding core 710 on which the reinforcement injection molding 720 is formed, and a plurality of sheds 40 ), a polymer insulator with an insulating housing containing the formed insulator is formed together.

Then, the polymer insulator formed as described above is separated from the lower mold 400 for post-processing, and the primary molding core 710 is rearranged into a pair of housing molding parts 800 .

And, the molding of the primary molding core 710 and the polymer insulator while repeating the process of arranging the core for the reinforcement injection molding again in the reinforcement injection molding part 600 that is emptied as the primary molding core 710 is rearranged It can be done in succession together.

On the other hand, the reinforcement injection may be formed in a form that further includes a shed (shed) shape at both ends.

6 is a photograph showing a state in which another embodiment of the reinforcing injection product according to the present invention is arranged in the housing molding part, and in FIG. 7 , for explaining the gradient of the housing molding part for preventing parting failure during molding of the reinforcement injection product The drawing is shown.

Referring to these drawings, in this embodiment, the reinforcing injection formed on the outer surface of the core includes a band body 722 for reinforcing the core diameter and a band shed 724 formed at both ends of the band body 722 .

In addition, the band body 722 is formed with a diameter (Db) smaller than the inner diameter (Dh) of the upper mold core forming part 842 and the lower mold core forming part 844, and the core forming part 842 of each mold. , 844), a gradient is further formed to prevent defects in the part where the parting line is formed.

In detail, when the diameter (Db) of the band body 722 corresponds to the inner diameter (Dh) of the upper mold core forming part 842 and the lower mold core forming part 844, the outer surface of the molded band body 722 has A chewing defect of the insulating material may occur along the parting line.

Therefore, in the polymer insulator injection mold according to the present invention, as described above, the diameter Db of the band body 722 is reduced, the band shed 724 is formed at both ends, and a gradient is formed around the parting line.

The gradient may be formed by connecting points where two circles (C) circumscribed to the upper mold core forming part 842 and the lower mold core forming part 844 are in contact with each other, and the shape of the gradient is shown in FIG. It can be confirmed more specifically through the schematic diagram shown in (b).

On the other hand, the band shed 724 prevents excessive insulating material from flowing into the core forming part when the insulating material is injected, and the flow of the insulating material transferred to the reinforced injection molding part 600 through the overflow flow path 540 . to improve

That is, the band shed 724 is disposed on the core forming part and the shed forming part 820 as shown in FIG. 6 to prevent the flow of the insulating material flowing into the band body 722 . In addition, a predetermined gap G is formed between the shed forming part 820 and the band shed 724 so that the insulating material that has not flowed into the band body 722 flows through the gap G through the overflow flow path 540 . can be transported more easily.

In addition, by controlling the flow of the insulating material as described above, it is possible to reduce the waste of the insulating material overflowing to the outside of the molding space, thereby reducing the time required for cleaning the mold after molding.

Meanwhile, FIG. 8 is a view showing an example of an ejector for demolding a polymer insulator injection mold according to the present invention, and FIG. 9 is a view for explaining an operation structure of the ejector shown in FIG. 8 .

Referring to these drawings, when crosslinking and molding are completed after the injection of the insulating material, demolding is performed, and for this purpose, the upper mold 200 according to the present invention is further provided with an ejector 900 .

The ejector 900 may be individually mounted to the ejector installation unit 240 (refer to FIG. 2 ) formed in the upper mold 200 as described above.

In detail, the ejector installation unit 240 is formed in a form in which a portion of the receiving space of the primary forming core 710 (refer to FIG. 5 ) formed by the upper mold core forming unit 842 is removed, and a portion of the removed receiving space is removed. The silver ejector 900 is configured to selectively connect the removed portion while being installed.

In more detail, the ejector 900 includes an ejector body (not referenced) installed in the upper mold 200 , a contact portion 920 protruding downward from the bottom of the upper mold 200 , and the contact portion 920 . It is configured to include a buffer unit 940 to assist the mold opening and closing force during selective length change and demolding.

To this end, the contact portion 920 is formed in a shape corresponding to the outer surface of the insulator core 50 of the molded polymer insulator, and such a shape may correspond to the upper mold core molding portion 842 .

In addition, the buffer part 940 is an elastic body provided inside the contact part 920 , and when the upper mold 200 and the lower mold 400 are molded, the contact part 920 comes in contact with the insulator core 50 , and the upper mold mold (200) It is elastically compressed while being drawn into the inside.

On the other hand, when the crosslinking and molding of the insulating material is completed and demolding is made, the upper mold 200 is easier to remove from the molded polymer insulator by assisting the mold opening force while the elastically compressed buffer 940 is elastically restored as described above. can be separable.

Hereinafter, a method for molding a polymer insulator using a polymer insulator injection mold formed as described above will be described, and in order to clarify the gist of the present invention, a core preheating process or an adhesive application process for molding a polymer insulator will be described. Detailed description will be omitted.

In the method for molding a polymer insulator according to the present invention, first, a molding preparation step of arranging the core in the reinforced injection molding part 600 and the primary molding core 710 in the housing molding part 800 is performed. do.

When the molding preparation step is completed, a molding step of molding the lower mold 400 and the upper mold 200 in which the core and the primary molding core 710 are disposed, and an insulating material is injected into the molding space inside the molded mold Insulation housing forming step is performed.

In the insulating housing forming step, the insulating material is injected into the housing forming part 800 and the reinforcement injection molding part 600 formed by the upper mold 200 and the lower mold 400, and the main inlet 510 is used. The injected insulating material is filled through the plurality of branch passages 530 and the injection hole 300 .

On the other hand, in the molding method according to the present invention, while the insulating housing molding step is made, the reinforcement injection molding step is performed together.

In detail, the reinforcing injection molding step is performed by introducing an insulating material into the reinforced injection molding unit 600 through the overflow flow path 540 while the insulating material is filled in the housing molding unit 800, thereby The molding of the insulating housing and the molding of the reinforcing injection may be performed together when the insulating material is injected once.

Claims

The upper mold and the lower mold are molded to form a cavity, but the cavity is

A reinforcing injection molding part for molding a reinforcing injection material for reinforcing the core diameter in a part of the core accommodated therein;

A housing molding unit for forming an insulating housing that provides a receiving space for the primary molding core in which the reinforcement injection product is formed, and surrounds all of the reinforcement injection molding material and the rest of the core together with a plurality of shed shapes in the received primary molding core separated by ;

Polymer insulator injection mold, characterized in that the reinforcing injection molding part and the housing molding part are arranged to be connected to each other to form a pair, and a plurality of pairs of the reinforcement injection molding part and the housing molding part are provided.
In the polymer insulator injection mold consisting of an upper mold and a lower mold, the upper mold and the lower mold include:

A reinforcing injection molding part for molding a reinforcing injection molding for reinforcing the core diameter in a part of the core accommodated therein by molding with each other;

A housing molding part for molding an insulating housing to surround all of the primary molding core accommodated together with a plurality of shed shapes is provided to provide a receiving space for the primary molding core in which the reinforcing injection is formed by molding with each other;

An overflow line through which the injected insulating material communicates with each other is further included between the reinforcing injection molding part and the housing molding part.
3. The method according to claim 1 or 2,

The reinforced injection molding part is a polymer insulator injection mold, characterized in that it is formed to have a length within a distance formed by a plurality of sheds formed in the housing molding part.
3. The method according to claim 1 or 2,

Polymer insulator injection mold, characterized in that the gradient for preventing chewing of the parting line of the reinforcing injection formed on the primary molding core is formed in the housing molding part.
5. The method of claim 4,

The gradient is a polymer insulator injection mold, characterized in that the upper mold and the lower mold and the housing molding portion and each circumscribed two circles are determined to be in contact with each other.
3. The method of claim 1 or 2,

Polymer insulator injection mold, characterized in that the upper mold is further provided with one or more ejectors for assisting mold separation by using the elasticity of the spring
3. The method according to claim 1 or 2,

Polymer insulator injection mold, characterized in that the inner space is formed so that the reinforced injection molding part includes a shed shape that is larger than the diameter of the reinforcement injection molding.
3. The method of claim 2,

The overflow line is a polymer insulator injection mold, characterized in that it guides the insulating material overflowed by being injected into the housing molding part to the reinforcement injection molding part.
A cavity for forming a reinforcing injection molding part formed by the lower mold is placed using a polymer insulator injection mold in which the cavity formed by combining the upper mold and the lower mold is divided into a reinforcement injection molding part and a housing molding part, and , a molding preparation step of arranging a primary molding core having a reinforced injection product formed therein in the housing molding portion formed by the lower mold;

a molding step of molding the upper mold to the lower mold in which the core and the primary molding core are disposed;

an insulating housing forming step in which an insulating material is injected into the housing forming part formed by the upper mold and the lower mold through the forming step to surround the primary forming core together with a plurality of shed shapes; and

Polymer insulator molding method, characterized in that it includes; the insulating material injected in the insulating housing molding step overflows and is transferred to the reinforcing injection molding part, and the transferred insulating material forms a reinforcement injection molding step.