Insulator with large and small spiral inner umbrella skirts and manufacturing method

Abstract

The invention discloses an insulator with large and small spiral inner umbrella skirts and a manufacturing method thereof, and the manufacturing method comprises the steps: S1, fixing a lower mold core on a mold machine table, and enabling the lower mold core to be located between a first outer mold and a second outer mold; s2, the lower mold core is sleeved with an inner umbrella skirt mold, a multi-spiral umbrella skirt structure at least comprising a large umbrella skirt and a small umbrella skirt is formed on the outer surface of the inner umbrella skirt mold, and the lead angles of the large umbrella skirt and the small umbrella skirt are consistent; s2, the first outer mold and the second outer mold are assembled to form a cavity according to the shape of the inner umbrella skirt mold; s3, resin is poured into the cavity, and an insulator is formed; s4, after cooling and curing, the first outer mold and the second outer mold are separated, and the inner umbrella skirt mold and the insulator are taken out together from the lower mold core; and S5, spirally taking out the inner umbrella skirt mold from the insulator to obtain the insulator. The forming method is simple and can be suitable for a traditional pouring mold, so that the insulator mold is low in cost, easy to operate, short in time and high in labor efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of insulator preparation, and in particular to an insulator with large and small spiral inner sheds and a manufacturing method thereof. Background Art

[0002] In the prior art, insulators of medium and high voltage air switches and inflatable cabinet switches, such as sealed poles, support insulators, bushing contact boxes and other insulating sheds are mostly composed of multiple shed blocks. After the insulator is formed, each block needs to be manually loosened and taken out from the inside and outside of the insulator one by one. During the manufacturing process, since the mold assembly requires matching gaps, the casting process requires fixing multiple sheds in fixed positions, and there are often large gaps between the blocks. The mold needs to be fixed with magnets during assembly. After the insulator comes out, there are often burrs and flash, and the molding quality is poor. At the same time, the demolding process requires knocking, and the insulator is often at risk of bumping.

[0003] In addition, since the shed pieces need to be removed horizontally, when the shed is too large, it is often difficult to pull it out or to remove it due to its length. Therefore, the internal shed of a larger shed is designed to be extremely small. Summary of the invention

[0004] One of the purposes of the present invention is to provide a method for manufacturing an insulator with large and small spiral inner shed skirts, which is used to form an inner shed skirt with a multi-spiral shed skirt structure inside the insulator.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for manufacturing an insulator with large and small spiral inner shed skirts, comprising:

[0007] S1, fixing the lower mold core on the mold machine, wherein the lower mold core is located between the outer mold 1 and the outer mold 2;

[0008] S2, sleeve an inner shed mold on the lower mold core, the outer surface of the inner shed mold is formed with a multi-spiral shed structure including at least a large shed and a small shed, and the spiral angle of the large shed is consistent with that of the small shed;

[0009] S2, combining the outer mold 1 with the outer mold 2 to form a cavity with the outer shape of the inner umbrella skirt mold;

[0010] S3, pouring resin into the cavity to form an insulator;

[0011] S4, after cooling and solidification, the outer mold 1 and the outer mold 2 are separated, and the inner shed mold and the insulator are taken out from the lower mold core;

[0012] S5. Take out the inner shed mold from the insulator spiral to obtain the insulator.

[0013] Furthermore, the lower mold core and the inner umbrella skirt mold are positioned through a tapered shaft.

[0014] Furthermore, the inner shed mold is formed by splicing an upper mold and a lower mold. When the inner shed mold is spirally taken out from the insulator, the lower mold is spirally separated and then the upper mold is spirally separated.

[0015] Further, a first magnetic block is provided at the bottom of the upper mold, and a second magnetic block is provided at the top of the lower mold. When the inner umbrella skirt mold is sleeved on the lower mold core, the lower mold is sleeved first, and then the upper mold is sleeved, and the upper mold is rotated to magnetically position the first magnetic block and the second magnetic block;

[0016] A first step portion is formed at the bottom of the upper mold, and a second step portion is formed at the bottom of the lower mold;

[0017] When separating the lower mold, the inner shed mold and the insulator are sleeved on the first expansion shaft, the first expansion shaft is started to hold the second step portion, and the insulator is rotated in the opposite direction to separate the insulator from the lower mold;

[0018] When separating the upper die, the upper die and the insulator are sleeved on the second expansion shaft, the second expansion shaft is pneumatically clamped to the first step portion, and the insulator is rotated in the opposite direction to separate the insulator from the upper die.

[0019] A second object of the present invention is to provide an insulator with large and small spiral inner shed skirts, wherein an inner shed skirt having a multi-spiral shed skirt structure is formed inside the insulator.

[0020] To achieve the above object, the present invention adopts the following technical solutions:

[0021] An insulator is formed by the above-mentioned method, comprising an inner shed, wherein the inner shed is a multi-spiral shed structure comprising at least a large shed and a small shed, and the spiral pitch angles of the large shed and the small shed are consistent.

[0022] Furthermore, the distance between the skirt ends of the large umbrella skirt and the small umbrella skirt is greater than 15 mm.

[0023] Furthermore, the distance from the skirt end of the small umbrella skirt to its root is greater than 10 mm.

[0024] Furthermore, the pitch of the multi-spiral umbrella skirt structure is greater than 30 mm.

[0025] Furthermore, the inclination angle of the upper umbrella skirt surface of the large umbrella skirt and the small umbrella skirt is 8-16 degrees, and the end portions of the large umbrella skirt and the small umbrella skirt are rounded transition.

[0026] Furthermore, the inclination angle of the lower umbrella skirt surface of the large umbrella skirt and the small umbrella skirt is less than 3°.

[0027] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0028] 1. The manufacturing method of the present invention is simple and can be applied to traditional casting molds, so that the insulator mold has low cost, simple operation, short time and high labor efficiency. At the same time, based on the molding method, a multi-helix structure can be easily formed inside the shed, which not only further improves the electrical performance compared with the single-helix shed, but also improves the demoulding efficiency;

[0029] 2. After demoulding, the insulator of the present invention has basically no defects such as sharp corners, burrs and flash, and does not need to be further processed, and can flow directly into the next process.

[0030] 3. Through the manufacturing method of the present invention, a more optimized insulator structure design can be achieved, and the distance between the skirt ends of the large shed and the small shed is greater than 15 mm, which is beneficial to improving the creepage distance; the inclination angle of the upper shed surface of the large shed and the small shed is 8-16°, and the inclination angle of the lower shed surface is less than 3°, which is beneficial to the dripping of water vapor, fog, dirt, etc. in the operating environment, is more suitable for the design of lightning and voltage creepage, and is suitable for the environmental pollution level of higher-level insulators. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of an insulator of the present invention;

[0032] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0033] Figure 3 is a flow chart of a method for preparing an insulator of the present invention;

[0034] Figure 4 It is a schematic diagram of the inner umbrella skirt mold of the present invention;

[0035] Figure 5 It is a cross-sectional schematic diagram of the inner umbrella skirt mold of the present invention;

[0036] Figure 6 It is a schematic diagram of the inner umbrella skirt mold sleeve of the present invention being arranged behind the lower mold core;

[0037] Figure 7 It is a schematic diagram of the outer mold 1 and the outer mold 2 after the mold is closed;

[0038] Figure 8 It is a schematic diagram of the inner shed mold and the insulator being separated from the outer mold 1 and the outer mold 2 of the present invention;

[0039] Fig. 9 It is another schematic diagram of the inner umbrella skirt mold of the present invention;

[0040] Fig.10 It is a schematic diagram of the lower mold separation of the present invention;

[0041] Fig.11 It is a schematic diagram of upper mold separation of the present invention.

[0042] Description of reference numerals:

[0043] 100, insulator; 110, body; 120, inner shed; 121, large shed; 122, small shed;

[0044] 200, lower mold core; 300, inner umbrella skirt mold; 310, upper mold; 311, first magnetic block; 312, first step portion; 320, lower mold; 321, second magnetic block; 322, second step portion; 410, outer mold one; 420, outer mold two; 610, first expansion axis; 620, second expansion axis. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, it should be noted that:

[0046] The terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0047] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0048] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0049] Example 1

[0050] Please refer to Figure 1 and Figure 2As shown, the present invention discloses an insulator with large and small spiral inner shed skirts, which includes a body 110 and an inner shed skirt 120 formed in the inner cavity wall of the body 110. The inner shed skirt 120 is a multi-spiral shed skirt structure including at least a large shed skirt 121 and a small shed skirt 122. The spiral pitch angles of the large shed skirt 121 and the small shed skirt 122 are consistent.

[0051] That is, the multi-spiral umbrella skirt structure can be a double-spiral umbrella skirt structure including only a large umbrella skirt 121 and a small umbrella skirt 122, and the large umbrella skirt 121 and the small umbrella skirt 122 are arranged in an alternating combination, or a triple-spiral umbrella skirt structure including a large umbrella skirt 121, a middle umbrella skirt and a small umbrella skirt 122 or more. The rotation direction of the multi-spiral umbrella skirt structure can be left-handed or right-handed, which is not specifically limited in the present invention. The multi-spiral umbrella skirt structure can adopt an equidistant pitch, that is, the distance between adjacent large umbrella skirts 121 is equal to the distance between adjacent small umbrella skirts 122; or an unequal pitch can be adopted, that is, the distance between adjacent large umbrella skirts 121 and the distance between adjacent small umbrella skirts 122 are not equal, and the large and small umbrella circles have their own tracks. The design process ensures that there is no interference between the umbrella skirts and the lift angle remains consistent.

[0052] Please refer to Figure 2 As shown, in a preferred embodiment, the distance B1 between the skirt ends of the large shed 121 and the small shed 122 is greater than 15 mm, so that the large shed 121 and the small shed 122 cooperate with each other, improve the surface creepage distance, improve the extended surface distance between the high and low voltage of the insulator, and improve the creepage ratio of the insulator 100. By adopting this high-jump and low-jump shape, the insulator 100 can have a stronger surface creepage resistance under lightning and flashover conditions, and improve the electrical bearing capacity of power frequency, lightning impulse, etc. More preferably, the distance B2 from the skirt end of the small shed 122 to its root is greater than 10 mm, and is set to 12 mm in this embodiment.

[0053] More preferably, the pitch L of the multi-spiral shed structure is greater than 30 mm. In this embodiment, the pitch L of the multi-spiral shed structure is 40 mm. At this time, the distance L1 between the large shed 121 and the small shed 122 is 20 mm.

[0054] In a preferred embodiment, the upper umbrella skirt surface of the large umbrella skirt 121 and the small umbrella skirt 122 is designed with a large oblique angle to meet the requirements of creepage. Here, the inclination angle α of the upper umbrella skirt surface of the large umbrella skirt 121 and the small umbrella skirt 122 is preferably 8-16°. The ends of the large umbrella skirt 121 and the small umbrella skirt 122 are transitioned through the rounded corner R, which is conducive to the dripping of water vapor, fog, dirt, etc. in the operating environment. The lower umbrella skirt surface of the large umbrella skirt 121 and the small umbrella skirt 122 is designed with a small angle, zero angle or negative angle to prevent water vapor and dirt from covering, and its inclination angle is less than 3°. Among them, the small angle is from the end of the lower umbrella skirt surface to its root to be inclined downward, the zero angle is from the end of the lower umbrella skirt surface to its root to be horizontal, and the negative angle is from the end of the lower umbrella skirt surface to its root to be inclined upward. In this embodiment, it is a zero angle design.

[0055] The insulator 100 with the above-mentioned structural design meets the pollution condition standard of the high-voltage insulator 100 specified in GB / T 2682.1-2000.

[0056] Example 2

[0057] Please refer to Figure 3 As shown, the present invention also discloses a method for manufacturing an insulator with large and small spiral inner sheds, which is used to form the insulator 100 as described in Example 1.

[0058] It includes:

[0059] S1, fix the lower mold core 200 on the mold machine, and the lower mold core 200 is located between the outer mold 1 410 and the outer mold 2 420;

[0060] S2. An inner shed mold 300 is set on the lower mold core 200. The outer surface of the inner shed mold 300 is formed with a multi-spiral shed structure including at least a large shed 121 and a small shed 122. The spiral angles of the large shed 121 and the small shed 122 are consistent. For the structure of the inner shed mold 300, please refer to Figure 4 and Figure 5 As shown, Figure 4 In the figure, C is the spiral starting point of the large shed, and D is the spiral starting point of the small shed. Please refer to the structure of the inner shed mold 300 and the lower mold core 200 after assembly. Figure 6 As shown;

[0061] S3, the outer mold 1 410 and the outer mold 2 420 are molded together to form a cavity with the inner skirt mold 300. Please refer to the structure after the mold is molded. Figure 7 shown.

[0062] S4, pouring resin into the cavity to form the insulator 100;

[0063] S5. After cooling and solidification, separate the outer mold 1 410 and the outer mold 2 420, and take out the inner shed mold 300 and the insulator 100 from the lower mold core 200. Please refer to the structure after taking out. Figure 8 As shown;

[0064] S6. Screw the inner shed mold 300 out of the insulator 100 to obtain the insulator 100.

[0065] The inner shed mold 300 is an internal hollow structure, which is sleeved on the lower mold core 200 when in use, which can reduce the mass of the inner shed mold 300 and facilitate the operation of the operator. In this embodiment, the lower mold core 200 and the inner shed mold 300 are positioned and sleeved by a tapered shaft, and the taper is 2-4°.

[0066] The large shed 121 and the small shed 122 formed on the outer surface of the inner shed mold 300 are the inner shed 120 of the molded insulator 100 .

[0067] Therefore, the present invention changes the traditional method of forming the inner umbrella skirt by splicing blocks. The demolding direction of the inner umbrella skirt mold 300 is changed from horizontal demolding to vertical demolding. There is no need for hammering as in traditional operations, and direct spiral demolding is sufficient. After demolding, the insulator has basically no defects such as sharp corners, burrs and flash, and no further processing is required, and it can directly flow into the next process.

[0068] In addition, the double helix structure has double the lead compared to the single helix structure, which can further improve the demoulding efficiency.

[0069] Since the insulator 100 shrinks during the curing process, for an insulator structure with a large specification or a long stroke, the holding force between the insulator 100 and the inner shed mold 300 may be large, making it difficult to separate them manually, and they need to be separated by special equipment, and the outer surface of the insulator 100 or the inner surface of the insulator is easily damaged. Therefore, the present invention proposes a more preferred molding method, please refer to Fig. 9 As shown, the inner shed mold 300 used in S2 is formed by splicing an upper mold 310 and a lower mold 320. When the inner shed mold 300 is spirally removed from the insulator, the lower mold 320 is spirally separated and then the upper mold 310 is spirally separated.

[0070] In a specific splicing mechanism, a pair of first magnetic blocks 311 are provided at the bottom of the upper mold 310, and a pair of second magnetic blocks 321 are provided at the top of the lower mold 320. When the inner umbrella skirt mold 300 is sleeved on the lower mold core 200, the lower mold 320 is sleeved first, and then the upper mold 310 is sleeved, and the upper mold 310 is rotated to magnetically position the first magnetic block 311 and the second magnetic block 321.

[0071] A first step portion 312 is formed at the bottom of the upper mold 310, a second step portion 322 is formed at the bottom of the lower mold 320, a first expansion axis 610 corresponding to the first step portion 312 is provided on the table of the first demolding tool, and a second expansion axis 620 corresponding to the second step portion 322 is provided on the table of the second demolding tool, so that:

[0072] When the lower mold 320 is separated, the inner shed mold 300 and the insulator are sleeved on the first expansion shaft 610, the first expansion shaft 610 is started to hold the second step portion 322 tightly, and the insulator 100 is rotated in the opposite direction manually or with the help of a tool, and after overcoming the suction force of the magnetic positioning, the insulator is separated from the lower mold 320;

[0073] When separating the upper mold 310, the upper mold 310 and the insulator are sleeved on the second expansion shaft 620, the pneumatic second expansion shaft 620 holds the first step portion 312, and the insulator is rotated in the opposite direction manually or with the help of a tool to separate the insulator from the upper mold 310 to obtain the insulator.

[0074] In this embodiment, the first expansion shaft 610 and the second expansion shaft 620 may be pneumatic expansion shafts.

[0075] In this way, through the secondary demoulding, the demoulding force required for a single time is small, and the demoulding can be completed manually, which is convenient for the operation.

[0076] When setting the parting surface between the upper mold 310 and the lower mold 320, the parting height is not the middle of the inner umbrella skirt mold 300, but is calculated based on the spiral lines of the upper mold 310 and the lower mold 320, so that the final spiral line lengths of the upper mold 310 and the lower mold 320 are similar, which is convenient for demolding.

[0077] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for manufacturing an insulator with large and small spiral inner shed skirts, characterized in that: include: S1, fixing the lower mold core on the mold machine, wherein the lower mold core is located between the outer mold 1 and the outer mold 2; S2, sleeve an inner shed mold on the lower mold core, the outer surface of the inner shed mold is formed with a multi-spiral shed structure including at least a large shed and a small shed, and the spiral angle of the large shed is consistent with that of the small shed; S2, combining the outer mold 1 with the outer mold 2 to form a cavity with the outer shape of the inner umbrella skirt mold; S3, pouring resin into the cavity to form an insulator; S4, after cooling and solidification, the outer mold 1 and the outer mold 2 are separated, and the inner shed mold and the insulator are taken out from the lower mold core; S5. Take out the inner shed mold from the insulator spiral to obtain the insulator.

2. The method for manufacturing an insulator with large and small spiral inner sheds as claimed in claim 1, characterized in that: The lower mold core and the inner umbrella skirt mold are positioned through a tapered shaft.

3. The method for manufacturing an insulator with large and small spiral inner shed skirts as claimed in claim 2, characterized in that: The inner shed mold is formed by splicing an upper mold and a lower mold. When the inner shed mold is spirally taken out from the insulator, the lower mold is spirally separated and then the upper mold is spirally separated.

4. The method for manufacturing an insulator with large and small spiral inner sheds as claimed in claim 3, characterized in that: A first magnetic block is provided at the bottom of the upper mold, and a second magnetic block is provided at the top of the lower mold. When the inner umbrella skirt mold is sleeved on the lower mold core, the lower mold is sleeved first, and then the upper mold is sleeved, and the upper mold is rotated to magnetically position the first magnetic block and the second magnetic block; A first step portion is formed at the bottom of the upper mold, and a second step portion is formed at the bottom of the lower mold; When separating the lower mold, the inner shed mold and the insulator are sleeved on the first expansion shaft, the first expansion shaft is started to hold the second step portion, and the insulator is rotated in the opposite direction to separate the insulator from the lower mold; When separating the upper die, the upper die and the insulator are sleeved on the second expansion shaft, the second expansion shaft is pneumatically clamped to the first step portion, and the insulator is rotated in the opposite direction to separate the insulator from the upper die.

5. An insulator with large and small spiral inner shed skirts, characterized in that: The method according to any one of claims 1 to 4 is used to manufacture the inner umbrella skirt, which is a multi-spiral umbrella skirt structure including at least a large umbrella skirt and a small umbrella skirt, and the spiral angles of the large umbrella skirt and the small umbrella skirt are consistent.

6. The insulator with large and small spiral inner shed skirts as claimed in claim 5, characterized in that: The distance between the skirt ends of the large umbrella skirt and the small umbrella skirt is greater than 15 mm.

7. The insulator with large and small spiral inner shed skirts as claimed in claim 6, characterized in that: The distance from the skirt end to the root of the small umbrella skirt is greater than 10 mm.

8. The insulator with large and small spiral inner shed skirts as claimed in claim 5, characterized in that: The pitch of the multi-spiral umbrella skirt structure is greater than 30 mm.

9. The insulator with large and small spiral inner shed skirts as claimed in claim 5, characterized in that: The inclination angle of the upper umbrella skirt surface of the large umbrella skirt and the small umbrella skirt is 8-16 degrees, and the end portions of the large umbrella skirt and the small umbrella skirt have rounded transitions.

10. The insulator with large and small spiral inner shed skirts as claimed in claim 5, characterized in that: The inclination angle of the lower umbrella skirt surface of the large umbrella skirt and the small umbrella skirt is less than 3°.

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