Method and device for manufacture of the electric plastic insulator

FIELD: chemical industry; methods and devices for manufacture of the electric plastic insulators.

SUBSTANCE: the invention is pertaining to the field of manufacture of the electric plastic insulators. The device for manufacture of electric plastic insulator contains the mould for manufacture of the insulating screens, which may be installed concentrically around the vertically located core or the hollow core. The mould has the field arranged below in the axial direction and fitting to the core around it or to the hollow core and the arranged above in an axial direction area, which is extending in radial direction with respect to the field arranged below in the axial direction and may be made according to the form of the being produced insulating screen. Between the end of the arranged below area in the axial direction and the upper end of the mould there is at least one injecting channel for injection of the liquid synthetic material under pressure. The method of manufacture of the electric plastic insulator is realized in several steps: a) the mold is installed in the preset axial position; b) form the a sealing coupling between the core and the mould; c)inject the liquid synthetic material under the heightened pressure with respect to the pressure of the environment; d) harden the synthetic material in the mould; e) remove the sealing joint; f) transfer the mould downwards on the preset spacing interval; h)repeat the steps b) - f) up to production of the required number of the insulating screens. The invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.

EFFECT: the invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.

12 cl, 3 dwg

 

The invention relates to a method and apparatus for manufacturing electric plastic insulator, containing situated in the center of the core or hollow core, in particular made of plastic reinforced with glass fibers, as well as several located coaxially around the core or hollow core insulating screens that are installed with the offset in the axial direction of the core or hollow core.

The method and corresponding device for manufacturing such a plastic insulator is known from the published description of the invention to accepted application DE 2044179. Here the open top of the mold is mounted coaxially around located in the center and positioned vertically core. Then the mould is filled by pouring liquid silicone mass. In respect of his hollow form has a contour that matches the required insulating screen. After curing silicone mass of the mold is moved in the axial downward direction, in particular on the value corresponding to the desired axial clearance between the two insulating screens. Thus are cast separate insulating screens.

Identified the disadvantage of this method is that the silicon mass, from which are cast insulating ek is Ana, should have relatively low viscosity, in particular equal to or lower than 25000 [MPa·]. In order to obtain a high-quality insulating surface of the insulating screens, you can enter only very limited in silicon mass fillers. This significantly increases the cost of raw materials and materials for the insulator.

Therefore, the basis of the invention is improved method and a corresponding device of the aforementioned type so that it is possible to use cheaper synthetic material, in particular silicone material with high viscosity, and in spite of this to ensure a high quality of cast insulating screens. Further, the method according to the invention should be implemented to reduce the time of manufacture of the insulator.

So the task of reducing the average filling out the form, in comparison with known methods of 60-80%.

The solution to this problem according to the invention is achieved by a method containing the following steps :

a) a First mold for casting insulating screens installed at a given axial position vertically core or hollow core. While inside the mold is core or hollow core coaxial with the hole provided for it is studied in the axial direction of the area of the mold; mold has, in addition, an open top region intended for forming an insulating screen.

b) Then between the core or hollow core on the one hand and the mold form with the other hand in at the bottom in the axial direction of the area of the mold creates a sealing connection. This is done, for example, by activating the seal.

C) After that, the liquid synthetic material under higher than ambient pressure pressure is injected into the axial region of the mold, which is located in the axial direction on the sealing connection and axially below the upper end of the mold. This is up until the mold with the specified volume is not filled with synthetic material.

g) Then synthetic material utverjdayut in a mold.

d) After curing the sealing connection between the core or hollow core and the mold form is again discarded. In particular, the seal in the mold is deactivated.

e) Then, the mold is moved relative to the core or hollow core in the axial downward direction by a given distance, which corresponds to the axial gap between the insulating screens.

f) Steps b)-e) is repeated until t is x then, until you made the required number of insulating screens.

According to an improved variant of the injection of the synthetic material is carried out under a pressure which corresponds at least 5 times the ambient pressure. In a mold an even temperature is maintained, in particular it is heated preferably at least in the curing step. This heating, in particular when using silicone as a synthetic material, is carried out to a temperature of at least 60°C.

Device for producing electric plastic insulator according to the invention is characterized by the fact that between the bottom end at the bottom in the axial direction of the area of the mold and the upper end of the mold is provided, at least one injection element or injection channel for injecting a liquid synthetic material under pressure.

When this injection element or injection channel is preferably adjacent in the axial direction of the area of the mold in which the core or hollow core in coaxial hole of the mold tightly to the mold. Cost of manufacturing may increase further due to the fact that the perimeter of the mold R is Vomero distributed multiple injection elements or injection channels, preferably four, six or eight.

Seal to isolate the mold from the core or hollow core is preferably under axial position of the injection elements or injection channels. Activation or deactivation of the seal is preferably manageable, this meant, in particular, pneumatic or hydraulic control. Finally, in an open top region of the mold elements are installed to maintain a uniform temperature, in particular a heating elementset new method is directed to the manufacture of insulating screen was carried out using a mold so that a synthetic material, in particular silicone material was injected under high pressure from the bottom to the open top of the mold. Thus, in contrast to the known method, the liquid synthetic material no longer is introduced from above into the open mold under pressure environment.

Thus obtained significant benefits.

First of all, you can use a cheaper source material. The material for forming or silicone material, you can add more additives that reduce the cost of raw materials in General.

Then you can handle liquid Sint the optical material, having a higher viscosity without reducing the quality of the surface insulating screens. By casting under pressure you can handle synthetic mass, a viscosity substantially above 25000 [MPa·s], at least up to 85000 [MP·]. Previously used material for moulding or silicone material had to be extremely low viscosity so that it was possible to produce high quality insulating screens.

Thus there is also the possibility of using the material for forming or silicone material with a shorter curing time, which reduces the time of manufacture of the plastic insulator and, therefore, increase the efficiency of the method.

Using the proposed method it is possible to make the insulating screens without any molding seam, and the material for forming or silicone material is applied directly to the Central core.

The drawing shows an embodiment of the invention.

Fig. 1 shows schematically a plastic insulator in section, Fig. 2 depicts a device for molding section, and the seal is not activated, Fig. 3 shows the same image as in Fig. 2, but with active seal.

In Fig. 1 visible electric plastic insulator 1. It is located in the center of the hollow of the heart condition is of IR 2, around which are coaxial insulating screens 3. While the 3 screens are installed respectively at a constant distance s from each other that corresponds to the path of travel below the mold 4 in the axial direction.

In Fig. 2 again visible located in the center of the hollow core 2 plastic insulator 1, the axis of which is installed vertically. For the manufacture of a separate insulating screens 3 is used mold 4. In the mold has a coaxial hole 5, which covers the hollow core 2.

In a mold 4 has at the bottom in the axial direction of region 6, which is predominantly axial hole 5 of the mold 4 is closely attached to a hollow core 2. Above the bottom region 6 in the axial direction is held open top area 7 of the mold 4. This area 7 form has its own cavity of the mold 4, which determines the shape of the molded insulating screen 3.

Using shown moving parts mold 4 is moved downward in the vertical position of the hollow core 2 (double arrow P in Fig. 3). Once made of insulating screen 3, the mold 4 is moved down in the axial direction shown in Fig. 1 the distance s. As can be seen in Fig. 2, during movement of the seal 13, which p is odnaznachno to create a solid sealing compound 8 (Fig. 3) between the mold form 4 and a hollow core 2, is deactivated.

If mold 4 reaches the desired axial position, preferably by creating a hydraulic or pneumatic pressure in the seal 13 it will be adjacent to a hollow core 2. Thus, there is a sealing compound 8 (Fig. 3). When this sealing compound 8 passes through located in the axial region 9, which is visible in Fig. 2 and Fig. 3.

Directly above passing in the axial direction by the region 9 of the sealing compound 8 is located in the axial region 10 is injection element or injection channel 12. This region 10 lies in the located in the axial region of the mold 4, which is adjacent basically tightly around to a hollow core 2. Liquid silicone mass, preferably fillers, is injected into the mold 4 through the injection element or injection channel 12. The mass may have a viscosity, at least up to 85000 [MPa·s], i.e. the value which is much higher coefficient of viscosity of 25000 [MPa·], discussed above as a limiting factor. Thus, it is possible to use so-called LSR-silicone (Liquid Silicon Rubber) (liquid silicone rubber), which was not possible in the known method the X.

While the injection of silicone material is carried out under pressure PE, which is significantly higher pressure Ro the environment. The injection pressure is at least 5 times the ambient pressure.

According to the invention it is important that the field point (point) injection 10, i.e. the axial point at which injection is an element or injection channel 12, is located between the lower end 15 is located in the bottom region 6 of the mold 4 and its upper end 11.

To accelerate the curing of the silicone material in the mold 4 against the wall cavities installed heating elements 14, which support temperature during curing, at least 60°C.

Around the perimeter of the mold 4, which is not visible in Fig. 1-3, are equidistant multiple injection elements or injection channels 12.

Preferably use four, six or eight of injection elements or injection channels 12. In a separate injection elements or injection channels 12 silicone material may be coaxially installed ring pipeline.

Rotation of the mold, as is known in the prior art, the method according to the invention is not required. Due to the lack of rotation forms silicone freely can the be passed in the injection elements or injection channels 12. Equally possible is simply electrical heating of the mold 4. Due activatable and deactivatable seal 13 may unimpeded movement of the mold 4 in the axial direction, because during this move, the seal 13 is not activated.

Tract filing silicone from its source to the injection(s) item(s) or injection(s) channel(s) 12 can be cooled in order to prevent it cure.

Over the mold form 4 may or may be installed one or more additional temperature elements 16. Such temperature control may be, in particular, an infrared lamp.

Instead of the described insulating screens 4 from silicone and synthetic materials they are, as is well known, can be composed of other, preferably synthetic resin, resistant to atmospheric effects.

The list of items

1 - electric plastic insulator

2 - core or hollow core

3 - insulating screens

4 - mold

5 - coaxial hole in a mold

6 - at the bottom in the axial direction of the region of the mold

7 - open top area of the mold

8 - o connection

9 - area sealing connection

10 - region point (point) injection

11 - the upper end of Itanos form

12 - injection channel

13 - seal

14 elements to maintain a uniform temperature

15 - the lower end of the mold

16 - (s) temperature(s) element(s)

R - double arrow

Ro - pressure environment

Re - injection pressure

s - the way you move in the axial direction

1. Device for producing electric plastic insulator containing a mold for the manufacture of insulating screens that can be installed concentrically around a vertical core or hollow core and is located in the axial region adjacent around the core or a hollow core and at the top in the axial direction of the region, which extends radially relative to the bottom in the axial direction and aligned with the shape of the produced insulating screen, characterized in that between the bottom end at the bottom in the axial direction of the region and the upper end of the mold is at least one injection channel for injection of liquid synthetic material under pressure.

2. The device according to claim 1, wherein the injection channel is transmitted in the axial direction of the area of the mold, the cat who swarm the core or hollow core in coaxial hole of the mold tightly to the mold.

3. The device according to claim 1 or 2, characterized in that the perimeter of the mold evenly distributed several injection channels, preferably four, six or eight of injection channels.

4. The device according to claim 1 or 2, characterized in that under axial position of the injection channel or injection channels is the seal for sealing the mold from the core or hollow core.

5. The device according to claim 4, characterized in that the seal made with the possibility managed activate or deactivate.

6. The device according to claim 5, wherein the seal is configured to activate, in particular inflation, pneumatically or hydraulically.

7. The device according to claim 1, characterized in that the open top area of the mold elements are to maintain a uniform temperature, in particular the heating elements.

8. The device according to claim 1, characterized in that above the mold form is located, or one or more additional temperature elements.

9. A method of manufacturing electric plastic insulator, containing situated in the center of the core or hollow core, in particular, of glass fiber reinforced plastics, as well as several installed coaxially around the core or hollow core is insulating screens, which are offset in the axial direction of the core or hollow core, which used the device according to claim 1, when this exercise stages: a) installation of the mold at a desired axial position around a vertical core or hollow core, b) create a sealing connection between the core or hollow core and the mold form in the bottom in the axial direction of the area of the mold, injecting a liquid synthetic material, in particular silicone material, under high compared to the pressure (pabout) ambient pressure (pe) located in the axial region of the mold, which is above the sealing compound in the axial direction and below the upper end of the mold in the axial direction, up until the mold is filled to a specified volume of synthetic material, g) curing the synthetic material in the mold, d) remove the sealing connection between the core or hollow core and the mold form, (e) moving the mold relative to the core or hollow core down in the axial direction for a specified distance (s), g) repeating steps b) - e) until until you made the required number of insulating screens.

10. the procedure according to claim 9, characterized in that the injection of synthetic material is carried out according to step C) item 9 under pressure (pe), which corresponds to at least 5-fold pressure (paboutenvironment.

11. The method according to claim 9, characterized in that the mold at least during step g) according to claim 9 maintain a uniform temperature, in particular fuel.

12. The method according to claim 11, characterized in that when using silicone as a synthetic material is carried out heating the mold, at least up to 60°C.



 

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