A kind of self-adapting preforming device for the main shaft wall thickness of load tap changer core

Abstract

The utility model discloses a kind of on-load tap changer core main shaft wall thickness self-adapting preforming device, including sleeve, adjusting assembly, support plate, support rod, fixed plate, core rod, mould outer mould and glass fibre bundle, sleeve is hollow cylindrical and adopts nylon material, adjusting assembly contains adjusting plate, adjusting support, guide pillar, spring and adjusting screw, adjusting plate, adjusting support and so on metal component are stainless steel material, guide pillar is equipped with four groups with spring and is distributed along the circumferential symmetry of adjusting plate, adjusting screw is connected in adjusting support and abuts the adjusting plate with cooperation screw thread, form self-adapting+manual double regulation structure, can ensure sleeve and core rod, mould outer mould coaxial according to glass fibre bundle extrusion force, support rod connects support plate and fixed plate and constitutes frame, and rib plate is equipped at junction, the device can guarantee that insulation main shaft wall thickness is uniform, improve product insulation level and pass rate, reduce the economic loss and social negative influence caused by product defect.

Description

Technical Field

[0001] This utility model belongs to the technical field of precision preforming equipment for glass fiber reinforced composite materials, specifically relating to a preforming device for adaptive wall thickness of on-load tap changer core spindle. Background Technology

[0002] The core-insulated spindle is a type of round tubular insulating component. During the pultrusion molding process, uneven wall thickness and air gaps can easily occur inside the product. The core spindle is made by continuously curing alkali-free glass fiber through a mold after being impregnated with epoxy resin. During the continuous extrusion process, the volume expansion of the glass fiber after impregnation causes wear on the mold surface, which in turn affects the spindle's dimensions. This leads to uneven contact pressure at the core spindle contacts, resulting in abnormal discharge phenomena, which in turn causes insulation breakdown and short circuits. In minor cases, this can cause substation power outages and power outages on the lines supplied by the substation. In severe cases, it can cause substation transformer fires, power outages on the lines supplied by the substation, and transformers to be returned to the factory for repair, resulting in serious economic losses and negative social impacts.

[0003] The insulating spindle of the current composite on-load tap changer core is pre-formed using a wall thickness adaptive pre-forming device. The device uses stainless steel for the adjusting plate, adjusting bracket, support rod, return spring, mold fixing plate, high-strength bolts for positioning guide posts, and nylon for the sleeve. The assembled device continuously and uniformly extrudes the glue-impregnated glass fiber bundles into the product shape through the sleeve, extruding excess glue and discharging the fiber bundles. This ensures the fiber bundles pass through the mold according to design requirements, protecting the mold surface from dimensional deviations due to wear. However, as the glue-impregnated glass fiber bundles continuously pass through the sleeve, the glue content and concentration can affect the glue content of each fiber, causing uneven glue distribution. This can lead to vertical and horizontal displacement of the fiber bundles as they pass through the sleeve. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide an adaptive preforming device for composite on-load tap changer core insulation spindle pultrusion, which can solve the defects of glass fiber bundle wear on the mold and uneven product wall thickness during on-load tap changer core insulation spindle pultrusion.

[0005] This utility model is achieved through the following technical solution: An adaptive preforming device for the spindle wall thickness of an on-load tap changer includes a sleeve, an adjusting assembly, a support plate, support rods, a fixing plate, a mandrel, an outer mold, and a fiberglass bundle. The sleeve is a hollow cylinder. The adjusting assembly includes an adjusting plate, an adjusting bracket, guide posts, and springs. The sleeve is mounted on the adjusting plate. The support plate is mounted at the bottom of the adjusting bracket. The adjusting plate is arranged around the adjusting plate. One end of the guide post is threaded onto the adjusting bracket, and the other end extends into a pre-set guide hole in the adjusting plate. The springs are fitted onto the guide posts. The support rods are respectively located at the four corners of the bottom of the support plate. The fixing plate is connected to the support rods, forming a rectangular frame. The mandrel passes through the sleeve and the outer mold. The mandrel, sleeve, and outer mold are coaxially arranged. The sleeve is made of nylon. The adjusting plate, adjusting bracket, guide posts, and support rods of the adjusting assembly are all made of stainless steel. Four sets of guide posts and springs are symmetrically distributed along the circumference of the adjusting plate, forming an adaptive adjustment structure for automatically adjusting when the fiberglass bundle is compressed. The sleeve is coaxial with the mandrel and the outer mold; the support rod is provided with stiffening ribs at the connection between it and the support plate and the fixing plate; the adjustment assembly also includes an adjustment screw; the adjustment screw is threaded onto the adjustment bracket, and the end of the adjustment screw abuts against the outer wall of the adjustment plate, used to manually adjust the sleeve to maintain coaxiality with the mandrel and the outer mold when the glass fiber bundle is compressed; the mandrel is made of 304 stainless steel, and its surface is provided with a chrome-plated wear-resistant layer with a thickness of 0.05-0.1mm; the guide post and the adjustment plate are pre-guided. The holes are fitted with a clearance of 0.02-0.05mm, and the inner wall of the guide hole is coated with grease. The adjusting screw is a socket head cap screw with a thread specification of M8-M12. A circular wear-resistant rubber pad is fixed to the abutting end of the adjusting screw and the adjusting plate. The diameter of the rubber pad is 2-3mm larger than the diameter of the adjusting screw. The stiffening plate is an isosceles right triangle structure with a thickness consistent with the wall thickness of the support rod. The two right-angled sides of the stiffening plate are welded and fixed to the side wall of the support rod, the support plate, and the surface of the fixing plate, respectively.

[0006] The beneficial effects of this utility model are: 1. The sleeve is made of nylon and the adjustment components are made of stainless steel. They are corrosion-resistant, acid and alkali-resistant, and wear-resistant, and can be used continuously multiple times, effectively reducing the wear and tear costs of the device. 2. The adaptive adjustment structure is formed by four sets of symmetrically distributed guide posts and springs, which can adaptively adjust the centering position of the sleeve according to the extrusion pressure of the glass fiber bundle. It can also be manually adjusted by screws, which solves the displacement problem caused by uneven glue content of the glass fiber bundle, ensures uniform wall thickness of the insulating spindle, and improves the insulation level of the product. 3. The sleeve can be directly replaced, which can quickly adapt to the production of mandrels of different specifications. The structure is simple and the operation is convenient, which effectively improves the efficiency of production conversion. 4. The device can reduce the wear of the impregnated glass fiber bundles on the mold surface, avoid deviations in the spindle's external dimensions, significantly improve the pass rate of insulated spindles in continuous production, and reduce economic losses and negative social impacts caused by product defects. Attached Figure Description

[0007] The present invention will now be described in further detail with reference to the accompanying drawings.

[0008] Figure 1 This is the main structural view of this utility model.

[0009] Figure 2 This is a side view of the structure of this utility model.

[0010] Figure 3 This is a cross-sectional view of the working state of this utility model.

[0011] The figure shows: 1-sleeve; 2-adjusting plate; 3-adjusting bracket; 31-adjusting screw; 32-guide post; 33-spring; 4-support plate; 5-support rod; 6-fixing plate; 7-core rod; 8-outer mold; 9-fiberglass bundle. Detailed Implementation

[0012] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0013] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0014] In the description of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0015] like Figures 1-3 The device shown is a pre-forming device for adaptive wall thickness of on-load tap changer core spindle, comprising a sleeve 1, an adjustment assembly, a support plate 4, a support rod 5, a fixing plate 6, a core rod 7, an outer mold 8, and a fiberglass bundle 9.

[0016] The sleeve 1 is a hollow cylinder; the sleeve 1 is made of nylon material.

[0017] The adjustment assembly includes an adjustment plate 2, an adjustment bracket 3, a guide post 32, and a spring 33; the sleeve 1 is mounted on the adjustment plate 2; the support plate 4 is mounted on the bottom of the adjustment bracket 3; the adjustment plate 2 is arranged around the adjustment plate 2; one end of the guide post 32 is threaded onto the adjustment bracket 3, and the other end extends into a pre-set guide hole in the adjustment plate 2; the spring 33 is fitted onto the guide post 32; the adjustment plate 2, adjustment bracket 3, guide post 32, and support rod 5 of the adjustment assembly are all made of stainless steel; four sets of guide posts 32 and springs 33 are arranged and symmetrically distributed along the circumference of the adjustment plate 2, forming an adaptive adjustment structure, used to adaptively adjust the sleeve 1 when the extrusion pressure of the glass fiber bundle 9 is relative to the mandrel 7 and the mold. On the coaxial line of the outer mold 8; the adjustment assembly also includes an adjustment screw 31; the adjustment screw 31 is threadedly connected to the adjustment bracket 3, and the end of the adjustment screw 31 abuts against the outer wall of the adjustment plate 2, used to manually adjust the sleeve 1 when the extrusion pressure of the glass fiber bundle 9 is on the coaxial line of the mandrel 7 and the outer mold 8; the guide post 32 and the preset guide hole of the adjustment plate 2 are in clearance fit, the fit clearance is 0.02-0.05mm, and the inner wall of the guide hole is provided with a grease coating; the adjustment screw 31 is an internal hexagonal head screw with a thread specification of M8-M12, and a circular wear-resistant rubber pad is fixedly provided at the abutting end of the adjustment screw 31 and the adjustment plate 2, the diameter of the rubber pad being 2-3mm larger than the rod diameter of the adjustment screw 31.

[0018] The support rods 5 are respectively set at the four corners of the bottom of the support plate 4; the support rods 5 are provided with stiffening plates 51 at the connection between the support rods 5 and the support plate 4 and the fixing plate 6; the stiffening plates 51 are isosceles right triangles with the same thickness as the wall thickness of the support rods 5, and the two right-angled sides of the stiffening plates 51 are welded and fixed to the side wall of the support rods 5, the support plate 4 and the surface of the fixing plate 6 respectively.

[0019] The fixing plate 6 is connected to the support rod 5 to form a rectangular frame; The mandrel 7 passes through the sleeve 1 and the outer mold 8; the mandrel 7, sleeve 1 and outer mold 8 are coaxially arranged; the mandrel 7 is made of 304 stainless steel and its surface is provided with a chrome-plated wear-resistant layer with a thickness of 0.05-0.1mm; the mandrel 7, sleeve 1 and outer mold 8 are all clearance fit. Work steps: The fixing plate 6 on the device is aligned with the outer mold 8, so that the sleeve 1 and the outer mold 8 are coaxially set. Then, the mandrel 7 is inserted into the sleeve 1 and passes through into the outer mold 8. The mandrel 7 and the sleeve 1 are fitted with a clearance fit, so that the glass fiber bundle 9 impregnated with glue is continuously and evenly squeezed from the outer wall of the mandrel 7 through the sleeve 1 in the shape of the product. This ensures that the volume of the glass fiber bundle passes through the mold according to the design requirements, protecting the mold surface from dimensional deviations due to wear. When the glass fiber bundle 9 impregnated with glue passes through the sleeve 1 continuously, the glue content and concentration of the glue will affect the uniformity of glue content in each glass fiber. At this time, the glass fiber bundle 9 passing through the sleeve 1 will exhibit vertical and horizontal displacement. Adjust the guide post in the assembly. When the force in a certain direction is too large, the spring 33 in the corresponding direction is compressed, and the spring force in the opposite direction of the offset of the adjusting plate 2 is applied, so that the sleeve 1 is always kept on the designed axis. When the force of the offset is greater than the spring force, and the adjusting plate 2 cannot be adjusted by the automatic adjustment component, the adjusting plate 2 is adjusted by rotating the adjusting screw 31 on the side of the offset, so that the sleeve 1 on the adjusting plate 2 is coaxial with the mandrel 7 and the outer mold 8, thereby ensuring that the glass fiber bundle 9 in the gap between the mandrel 7 and the outer mold 8 is evenly distributed, and the wall thickness of the main shaft after curing by the mold is uniform, thus improving the insulation level of the insulating main shaft.

[0020] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A pre-forming device for adaptive wall thickness of on-load tap changer spindle, characterized in that: The system includes a sleeve (1), an adjusting assembly, a support plate (4), a support rod (5), a fixing plate (6), a mandrel (7), an outer mold (8), and a fiberglass bundle (9); the sleeve (1) is a hollow cylinder; the adjusting assembly includes an adjusting plate (2), an adjusting bracket (3), a guide post (32), and a spring (33); the sleeve (1) is mounted on the adjusting plate (2); the support plate (4) is mounted at the bottom of the adjusting bracket (3); the adjusting bracket (3) is positioned on the adjusting plate (2). The guide post (32) is threaded at one end and inserted into the guide hole of the adjustment plate (2) at the other end. The spring (33) is fitted on the guide post (32). The support rods (5) are respectively set at the four corners of the bottom of the support plate (4). The fixing plate (6) is connected to the support rods (5) to form a rectangular frame. The mandrel (7) passes through the sleeve (1) and the outer mold (8). The mandrel (7), sleeve (1) and outer mold (8) are coaxially arranged.

2. The adaptive preforming device for the spindle wall thickness of an on-load tap changer core according to claim 1, characterized in that: The sleeve (1) is made of nylon.

3. The adaptive preforming device for the spindle wall thickness of an on-load tap changer core according to claim 1, characterized in that: The adjustment plate (2), adjustment bracket (3), guide column (32) and support rod (5) of the adjustment assembly are all made of stainless steel.

4. The adaptive preforming device for the spindle wall thickness of an on-load tap changer core according to claim 1, characterized in that: The guide post (32) and spring (33) are arranged in four sets and are symmetrically distributed along the circumference of the adjustment plate (2) to form an adaptive adjustment structure. When the glass fiber bundle (9) is under pressure, the sleeve (1) is automatically adjusted to keep the mandrel (7) and the outer mold (8) coaxial.

5. The adaptive preforming device for the spindle wall thickness of an on-load tap changer core according to claim 1, characterized in that: The support rod (5) is provided with a stiffening plate (51) at the connection between it and the support plate (4) and the fixing plate (6).

6. The adaptive preforming device for the spindle wall thickness of an on-load tap changer core according to claim 1, characterized in that: The adjustment assembly also includes an adjustment screw (31); the adjustment screw (31) is threaded onto the adjustment bracket (3), and the end of the adjustment screw (31) abuts against the outer wall of the adjustment plate (2) for manually adjusting the sleeve (1) to remain coaxial with the mandrel (7) and the outer mold (8) when the glass fiber bundle (9) is compressed.

7. The preforming device for adaptive wall thickness of on-load tap changer spindle as described in claim 1, characterized in that: The core rod (7) is made of 304 stainless steel and has a chrome-plated wear-resistant layer with a thickness of 0.05-0.1mm on its surface.

8. A pre-forming device for adaptive wall thickness of on-load tap changer spindle as described in claim 1 or 4, characterized in that: The guide post (32) and the preset guide hole of the adjustment plate (2) are in clearance fit, with a fit gap of 0.02-0.05mm, and the inner wall of the guide hole is provided with a grease coating.

9. A pre-forming device for adaptive wall thickness of on-load tap changer spindle as described in claim 6, characterized in that: The adjusting screw (31) is an internal hexagonal head screw with a thread specification of M8-M12. A circular wear-resistant rubber pad is fixed at the abutting end of the adjusting screw (31) and the adjusting plate (2). The diameter of the rubber pad is 2-3 mm larger than the rod diameter of the adjusting screw (31).

10. A pre-forming device for adaptive wall thickness of on-load tap changer spindle as described in claim 5, characterized in that: The stiffener (51) is an isosceles right triangle structure with a thickness consistent with the wall thickness of the support rod (5). The two right-angled sides of the stiffener (51) are welded and fixed to the side wall of the support rod (5), the support plate (4), and the fixing plate (6), respectively.

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