CN201178009Y - Equipment for the production of composite insulators - Google Patents

Abstract

The utility model relates to a molding device used in the production of composite insulators for high-voltage equipment, which aims to solve the problems of low precision, time-consuming operation and worker safety in manual loading and demoulding operations. The utility model proposes a device for producing composite insulators, which includes a mold with first and second mold parts, which are arranged to be movable relative to each other and arranged to accommodate a mandrel and a mold made of insulating material. The sheath is applied to the mandrel, the apparatus further comprising retainer means for retaining the mandrel during opening and closing of the mould, and the retainer means is arranged to retain the mandrel relative to the second mold part during the first opening phase Fixing, keeping the mandrel fixed relative to the first mold part during the second opening stage. The utility model solves the above-mentioned problems existing in manual loading and/or using a manually controlled lifting device for loading and demoulding operations.

Description

Equipment for the production of composite insulators

technical field

The utility model relates to a molding device used when producing composite insulators for high-voltage equipment, and more particularly relates to a device for producing composite insulators.

Background technique

Compared to traditional insulators made purely of ceramic or glass, composite insulators are composed of two different material components.

A composite electrical insulator is known which comprises an elongated solid or hollow mandrel made of fiber reinforced plastic (FRP), a sheath covering the mandrel substantially throughout its length, and a plurality of Skirts protruding and spaced from each other in the longitudinal direction of the mandrel. The sheath and skirt are integrally formed by injection molding or transfer molding a suitable polymeric material with electrical insulation properties such as silicone rubber, ethylene propylene copolymer (EPM), ethylene propylene diene copolymer (EDPM), polyurethane, etc. on the mandrel. The mandrel has a longitudinal end provided with an abutment which is integral with the sheath and on which a metal fitting can be fixedly mounted. This kind of composite insulator has actually been put into practical application, especially in any use environment that can embody various functional advantages of the composite insulator.

To manufacture composite insulators, a mold assembly typically used includes upper and lower mold halves which, when closed, define a mold cavity. The mold cavity has an inner surface corresponding to the outer shape of the sheath, skirt and seat to be formed on the mandrel. Thus, with the mandrel placed in the mold cavity, a polymeric material is injected or introduced into the mold cavity and cured therein to form the sheath, skirt and seat integral with the mandrel. The mold must close tightly to prevent burrs from forming along the parting lines of the mold halves.

A problem in the current production of large composite electrical insulators is the loading and demolding operations. For large parts to be integrated in the molding process, it is the state of the art to load manually and/or use manually controlled lifting devices for the loading and demolding operations. Problems in these methods are low accuracy, time-consuming operation, and worker safety issues.

Utility model content

The utility model provides an apparatus for producing composite insulators comprising mandrels and sheaths made of polymer insulating material for high voltage applications, said apparatus comprising first and second mold parts and the first and second mold parts are arranged to be movable relative to each other and to accommodate a mandrel and to apply a sheath of insulating material to the mandrel, wherein the apparatus comprises a Holder means that hold and guide the mandrel during closing and opening of the mould, and that are arranged to keep the mandrel stationary relative to the second mold part during the first opening phase, and in the second Keeping the mandrel fixed relative to the first mold part during the second opening phase.

The equipment for producing composite insulators of the present invention can control the movement and position of pipe parts in and out of the mold during the injection molding process of composite insulators for both vertical and horizontal pressing. The utility model can also be used for similar pressing and injection molding processes of other products and materials.

The die is attached to the platen of the press, and the movement and force of the platen provides the movement and force of the die. The holder device controls the position of the mandrel holder during mold closing, molding and demolding. When opening the molds (demoulding), the insulator is first removed (separated or demolded) from one mold during a first opening stage and then demolded from the other mold during a second opening stage. The arms are separated from each other during the second opening stage and prior to release from the second mould.

The utility model solves the problem of manual loading and/or using a manually controlled lifting device for loading and demoulding operations. The utility model controls the movement of the pipe when it enters the mold and is demolded after curing. Describe device and principle of the present utility model below by accompanying drawing.

The length of the insulator produced by the equipment described in the utility model can reach 1 meter to 4 meters or longer. High voltage in this application means 72 kV or higher.

Description of drawings

The drawings constitute a part of this specification and include exemplary embodiments of the invention, which may be embodied in different forms.

Figure 1 schematically shows the position of the mold and hollow mandrel or mandrel before the injection molding process begins.

Figure 2 schematically shows the position of the mold and hollow mandrel or mandrel during the injection molding process.

Figure 3 schematically shows the position of the mold and the hollow mandrel or mandrel after the injection molding process has ended and the demolding process has begun.

Figure 4 schematically shows the position of the mold and the hollow mandrel or mandrel after the injection molding process is complete and the demolding process is complete.

Fig. 5 is a technical diagram showing the invention and the arrangement of the components during the injection molding process.

Figure 6 is a technical diagram showing the invention and the arrangement of the components after the injection molding process and after the insulator has been demoulded.

Fig. 7 is a technical drawing showing a part of the apparatus (mandrel holder device).

Detailed ways

A detailed description of the preferred embodiments is provided below. However, it should be understood that the present invention may be embodied in different forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but as a basis for the claims and as a representative basis for teaching one skilled in the art to practice the invention in any suitable manner. specific systems, structures or approaches.

Figure 1 schematically shows the position of the first and second mold parts 1, 2 (also called mold halves) and the hollow mandrel or mandrel 3 making up the mould, before the injection molding process begins. Both ends of the mandrel 3 are fixed by mandrel holders 5 . The mandrel 3 may be a hollow mandrel for large insulators, and it may also be a solid body for eg suspension insulators. The mandrel holder 5 has the function of holding and controlling the position of the mandrel 3 during loading into the mold and during and after the demolding cycle. Two means or first arms 6 are connected on each side to one of the mandrel holders 5 and thus have a position relative to the first mold part 1 . The first mold part 1 is freely movable in a linear movement between the two fixed end positions A and B independently of the mandrel holder 5 with high precision. When closing and opening the first and second mold parts 1, 2, the movement of the first arm is limited by a linear guide between positions A and B and the movement of the first arm 6 is limited by a mechanical stop on the first arm 6. Limitation of the movable member 10. In FIG. 1 , the platen 8 of the press is indicated by a dotted box. The first and second mold parts 1, 2 are connected to the platen 8 and any movement of the first and second mold parts 1, 2 is due to the momentum of the platen 8 of the press, i.e. the movement of the platen 8 of the press Movement of the first and second mold parts 1, 2 is caused. The first mold part 1 is movable on the first arm 6 and a mechanical stop 10 limits the movement of the first mold part 1 on the first arm 6 .

The mandrel holder 5 is provided on each side with a plate and a central shaft, which also fulfills several functions for manipulating the assembly during operations other than pressing. The mandrel holder 5 has integrated heating means and is provided with a shaft for manipulation to precisely fix the mandrel 3 . The shaft is connected to the first arm 6 in such a way that the mandrel 3 is axially fixed.

Two further devices or second arms 4 can be connected and detached from the first arm 6 . When the second arm 4 is separated from the first arm 6 , the mandrel holder 5 is free to move in a linear movement independently of the second mold part 2 .

The first and second arms guide the mandrel 3 for loading the mold and for demoulding, and the force required for moving the mold is provided by the platen 8 of the press during molding and demoulding. Thus, the first arm 6, the second arm 4 and the mandrel holder 5 constitute a holder arrangement for holding and guiding the mandrel (3) during closing and opening of the first and second mold parts 1, 2 .

Figure 2 schematically shows the position of the first and second mold parts 1, 2 and the hollow/solid mandrel or mandrel 3 during the injection molding process. The second arm 4 is connected and fixed to the first arm 6 at 7 and the first mold part 1 is moved to position B. The volume between the mandrel and the mold is filled with cured polymer insulation. The mandrel holder ( 5 ) is provided integrally with a heating device to cure the polymer insulating material molded on the mandrel 3 . The force required to hold the first and second mold parts 1 , 2 together during the forming process is provided by the pressure plate 8 .

Figure 3 schematically shows the position of the first and second mold parts 1, 2 and the hollow mandrel or mandrel 3 after the injection molding process and at the end of the first opening phase. During the first opening stage, the press plate moves away, but the retainer arrangement prevents the mandrel from being ejected from the second mold part. The first mold part 1 is moved horizontally to release the insulator from the first mold part. The first mold part 1 is moved to position A on the first arm 6 until it reaches the mechanical stop 10, which ends the first phase of the opening or demoulding process. Figure 3 shows the skirt and seat 9 formed on the mandrel by the forming process. In other words, the first arm 6 and the second arm 4 are arranged to be connected during said first opening phase, when the second arm 4 is connected to the first arm 6 the position of the mandrel holder 5 is relative to the second Mold part 2 is fixed.

Figure 4 schematically shows the position of the first and second mold parts 1, 2 and the hollow mandrel or mandrel 3 after the end of the second opening phase and after demolding of the insulator from the two mold parts has been achieved. The second opening phase starts when the second arm 4 is separated from the first arm, ie the first arm 6 and the second arm 4 are arranged to be separated during said second opening phase. During the second opening phase, the second mold part 2 is moved horizontally away from the hollow mandrel 3 with the molded sheath covering the mandrel. The composite insulator can now be removed from the mandrel holder 5 and a new hollow mandrel can be placed between the platens so that the process can start again. In FIG. 4 the skirt and seat 9 formed on the mandrel by the forming process are shown.

The steps in the process of producing large composite insulators are:

1. Fix the mandrel 3 in place between the mold parts and connect to the mandrel holder 5 which is connected to the first arm 6 on both sides.

2. When the mandrel holder 5 is moved (by moving the platen of the press) for the closing operation, the tube assembly is loaded first into the mold section associated with the second arm 4 and then into the mold section associated with the first arm 6 in the mold section. During this operation, the position of the mandrel is guided by first arms 6, one on each side of the mold part.

3. The mandrel holder 5 attached to the tube assembly has an integral heating device which transfers heat to the flanges located on the tube assembly and thus speeds up the curing cycle.

4. After the curing cycle is over, the mold starts to be opened by a pushing motion. During the first opening phase, the mandrel is fixed to the second mold part 2 and will remain inside the second mold part 2 until the first mold part 1 moves along the first arm 6 and reaches the right end at the mechanical stop 10 position a. In the second opening stage, the first arm 6 and the second arm 4 are separated (at 7 ) and further movement of the press releases the tube assembly from the second mold part 2 .

5. After the demoulding (and second opening stage) is complete, the tube assembly (coated with injection molding material) is placed in a fixed position between the mold parts, making it easy to further automate manipulation.

Many different embodiments of the utility model are conceivable. In one embodiment, the mandrel holder 5 may be fixed and the arms are each detached from the mandrel holder 5 and move independently to demold the insulator. In another embodiment, the second mold part 1 is fixed. First, the first mold part 1 is moved along the first arm 6 to demould the insulator. Then, the second arm 4 is detached from the mandrel holder 5 and the first arm continues to move away, thereby releasing the insulator from the second mold part 2 . The figure shows the mold sections moving in the horizontal direction, but another embodiment of the invention rotates the mold 90 degrees so that the mold sections move in the vertical direction. In other words, the movement of the first and second mold parts 1 , 2 of the invention relative to each other can be either vertical or horizontal.

Figures 5 and 6 show technical drawings of parts bearing the same reference numerals as in the preceding figures. It will be appreciated that the second arm 4 in Figure 6 is detached from the first arm 6 and turned 90 degrees so that they point into the drawing. In FIG. 5 the first arm 6 is held in position A by the linear guide and in FIG. 6 the first arm 6 is held in position B by the linear guide.

Figure 7 shows a technical drawing of the mandrel holder 5 part of the device. The second arm 4 is connected to the first arm 6 at 7 . A hollow mandrel or mold insert is attached to a flange at the lower part of the mandrel holder 5 . On the other side of the apparatus there is a similar mandrel holder 5 and together these two holder arrangements hold the hollow mandrel in the correct position during closing of the first and second mold parts 1 , 2 . The means for separating the first arm 6 and the second arm 4 at 7 can be seen in FIG. 7 .

Claims (8)

1. equipment that is used to produce composite insulator, described composite insulator comprises plug and the sheath of being made by the insulating material of polymer that is used for high-voltage applications, described equipment comprises have first and second mould parts mould of (1,2), and described first and second mould parts are arranged to relative to each other to move and to be arranged to hold plug (3) and the sheath that insulating material is made are applied on the plug (3)

It is characterized in that,

Described equipment comprises the keeper device that is used in the closure of described mould and keeps and guide described plug (3) during opening, and described keeper device keeps described plug fixing with respect to second mould part (2) during being arranged in first opening stage, and keeps described plug fixing with respect to first mould part (1) during second opening stage.

2. the equipment that is used to produce composite insulator as claimed in claim 1 is characterized in that, described keeper device comprises the first arm (6), second arm (4) and plug keeper (5).

3. the equipment that is used to produce composite insulator as claimed in claim 2 is characterized in that, described the first arm (6) is arranged to and will be connected during described first opening stage with described second arm (4).

4. the equipment that is used to produce composite insulator as claimed in claim 2 is characterized in that, described the first arm (6) is arranged to and will be separated during described second opening stage with described second arm (4).

5. as each described equipment that is used to produce composite insulator in the claim 2 to 4, it is characterized in that, when described second arm (4) was connected to described the first arm (6), the position of described plug keeper (5) was fixing with respect to described second mould part (2).

6. as each described equipment that is used to produce composite insulator in the claim 1 to 4, it is characterized in that, described first and second mould parts (1,2) are connected to the pressing plate (8) of forcing press, and cause moving of described first and second mould parts (1,2) by the described pressing plate (8) of described forcing press mobile.

7. as each described equipment that is used to produce composite insulator in the claim 1 to 4, it is characterized in that described plug keeper (5) solidifies with the insulating material of polymer that heater is provided with integratedly will be molded on the described plug (3).

8. as each described equipment that is used to produce composite insulator in the claim 1 to 4, it is characterized in that relative to each other mobile of described first and second mould parts (1,2) is vertical or level.

Images