A tooling for cutting risers in ultra-high voltage GIS cover plate castings

Abstract

This utility model discloses a riser cutting fixture for ultra-high voltage GIS cover plate castings, comprising: a working platform, a support platform, a rotating mechanism, and a parts fixture frame; the support platform is disposed below the working platform; the rotating mechanism is driven and connected to the working platform to drive the working platform to rotate; the parts fixture frame includes a lower fixture frame, an upper fixture frame, and multiple fixture frame columns connecting the lower fixture frame and the upper fixture frame; multiple rollers are provided between the support platform and the working platform to solve the problems of high labor intensity and low production efficiency in existing riser cutting.

Description

Technical Field

[0001] This utility model belongs to the field of riser removal technology and relates to a tooling for cutting risers in ultra-high voltage GIS cover plate castings. Background Technology

[0002] In the high-voltage switchgear industry, aluminum alloy cover plates are commonly used to seal aluminum alloy casting flange housings. Structurally, the aluminum alloy cover plate consists of a near-spherical shell connected to the flange, typically manufactured using low-pressure casting. To ensure the casting is free of significant shrinkage defects, multiple risers are evenly distributed on the flange surface of the cover plate during the casting process. For ultra-high-voltage GIS applications, the aluminum alloy cover plates used are larger, heavier, and more structurally complex. The low-pressure casting process currently used in their production is also more complex. During casting, the flange surface faces upwards, and the risers are evenly distributed on the flange surface, totaling eight risers. These risers serve to collect slag and provide feeding during the cover plate's filling and solidification processes.

[0003] For components, risers are redundant parts that need to be removed before heat treatment of the casting. Various methods can be used to remove risers, typically using saw blades or saw teeth for cutting, or turning. Currently, there are generally two methods for removing risers. One method involves fixing the component and then using a high-speed saw blade or saw teeth to cut off the riser. This method relies on simple bolt tightening, requiring many bolts and a long disassembly time. This method places the cover plate on a simple fixture, requiring manual adjustment after each cut, resulting in low overall efficiency for riser cutting. While robots can be used to handle the cover plate castings, the maximum diameter of UHV GIS cover plate castings exceeds 1 meter and the weight exceeds 90 kg, necessitating large robots and significant equipment investment. The other method involves fixing the component to a lathe or other rotating device, allowing it to rotate at high speed, and then removing the riser by turning. This method is suitable for rotating components that can rotate stably, and where the component size and weight cannot be too large. It requires specialized equipment, which is very expensive.

[0004] Chinese patent CN201710953907.3 installs an air extractor under the workbench to reduce the air pressure in the space beneath the casting. Atmospheric pressure is used to adhere the casting to the workbench, thus securing it. However, for large or irregularly shaped castings, the uneven surface makes achieving negative pressure adsorption difficult and requires a high-powered air extractor. Therefore, this solution has limitations and is only suitable for small, simple-shaped parts, not large cover-type parts. Patent CN202010204845.8 uses a chuck core and jaws to clamp and release aluminum alloy motor housings via an internal expansion mechanism. The jaws penetrate deep into the aluminum alloy motor housing, providing convenient, quick, and secure clamping, resulting in stable and reliable cutting and improved cutting accuracy. This solution also has limitations, requiring a specific casting shape, space, and position for jaw clamping. Furthermore, for large cover-type parts, the available clamping space is limited, and the reliability of the clamping mechanism needs further verification. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a tooling for cutting risers in UHV GIS cover plate castings, so as to solve the problems of high labor intensity and low production efficiency in existing riser cutting.

[0006] This utility model is achieved through the following technical solution: A tooling for cutting risers in ultra-high voltage GIS cover plate castings, comprising: Work platform, support platform, rotating mechanism and parts tooling rack; The support platform is located below the working platform; the rotating mechanism is connected to the working platform drive and is used to drive the working platform to rotate; The part fixture includes a lower fixture layer, an upper fixture layer, and multiple fixture columns connecting the lower fixture layer and the upper fixture layer; Multiple rollers are provided between the support platform and the working platform.

[0007] Preferably, the upper layer of the tooling frame is tightly connected to the cover plate casting through an upper-layer fastening mechanism; the lower layer of the tooling frame is connected to the work platform through a lower-layer fastening mechanism.

[0008] Preferably, the lower fastening mechanism includes multiple tooling fastening clips and a second bolt. The tooling fastening clips are locked by the second bolt so that the lower tooling is pressed and fixed to the working platform.

[0009] Preferably, the upper fastening mechanism includes multiple cover plate fastening clips and a first bolt, and the cover plate fastening clips are locked by the first bolt so that the cover plate casting is pressed and fixed on the upper layer of the tooling frame.

[0010] Preferably, at least four sets of both the lower and upper fastening mechanisms are provided and are evenly distributed.

[0011] Preferably, the wheel surface of the roller contacts the bottom surface of the work platform to provide auxiliary support and reduce frictional resistance when the work platform rotates.

[0012] Preferably, the support platform is equipped with support columns at its bottom; Preferably, the number of rollers is seven, and they are fixed to the support platform by roller fastening bolts.

[0013] Preferably, the rotating mechanism is a servo motor system, the output of which is connected to the working platform to provide a stable and controllable rotation speed.

[0014] Preferably, the working platform is a carbon steel plate with a thickness of more than 20mm, and has multiple threaded holes.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This utility model discloses a cutting fixture for risers of ultra-high voltage GIS cover plate castings. The solution adapts to the special structure of the cover plate casting by setting up a parts fixture frame including a lower layer, an upper layer, and columns. Combined with the lower and upper layer fastening mechanisms, it achieves reliable dual fixation between the workpiece and the fixture, and between the fixture and the working platform. This ensures that the enormous cutting force during the cutting process will not cause workpiece displacement, guaranteeing operational safety and cutting accuracy. The combination of the working platform, support platform, and rotating mechanism constitutes a stable reference and power system. The key lies in the multiple rollers installed between the support platform and the working platform. This solves the problem of frictional resistance and stability during the rotation of large, heavy-duty platforms. The rollers provide full-circumferential auxiliary support for the working platform, preventing it from jamming or deforming due to eccentric loads. Furthermore, by converting sliding friction into rolling friction, they greatly reduce rotational resistance, enabling the rotating mechanism to smoothly, effortlessly, and precisely drive workpieces weighing several tons for indexing rotation. Ultimately, this tooling system transforms the traditional cumbersome and dangerous operation, which relies on manual overhead crane hoisting, repetitive positioning, and manual cutting, into a seamless process where all riser removal can be completed with a single clamping, followed by controlled rotation and mechanized cutting. This fundamentally solves the problems of high labor intensity and low production efficiency mentioned in the background technology. This utility model has a reasonable solution, simple structure, and is easy to implement, fully leveraging the advantages of easy and controllable rotation during the cutting of cover plate-type parts.

[0016] Furthermore, this utility model includes a rotating mechanism, which facilitates controllable rotation of the parts during riser cutting, thus reducing labor intensity. Furthermore, this invention incorporates rollers, which provide rotational support and lubrication for the worktable. Furthermore, this utility model adopts a bolt fastening method, which realizes the fastening and quick disassembly of the cover plate casting. The fastening clamp fits tightly with the parts storage rack, which can ensure stability and reliability when fastening large parts. Furthermore, the tooling fixture used in this utility model can be used for heavy and large-sized UHV GIS cover plate castings, meeting the cutting requirements of complex structure cover plate risers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the riser cutting tooling structure for the UHV GIS cover plate casting of this utility model; Figure 2 This is a side view of the riser cutting fixture for the UHV GIS cover plate casting of this utility model. Figure 3 This is a front view structural schematic diagram of the riser cutting tool for ultra-high voltage GIS cover plate casting of this utility model; Figure 4 This is a schematic diagram of the left cross-sectional structure of the riser cutting tool for the ultra-high voltage GIS cover plate casting of this utility model; In the diagram: 1-Cover plate casting, 2-Riser, 3-Cover plate fastening buckle, 4-First bolt, 5-Roller, 6-Cutting equipment, 7-Working platform, 8-Lower layer of tooling rack, 9-Tooling rack column, 10-Upper layer of tooling rack, 11-Supporting platform, 12-Tooling rack fastening buckle, 13-Second bolt, 14-Rotating mechanism, 15-Roller fastening bolt, 16-Supporting column. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0020] Example 1 See Figures 1-4 This embodiment provides a cutting fixture for risers in UHV GIS cover plate castings, aiming to solve the problems of high labor intensity, poor safety, low efficiency, and unstable cutting quality in existing technologies for manually cutting risers. This fixture, through the integration of clamps, a rotating platform, and an auxiliary support system, achieves mechanized and automated cutting of risers in large cover plate castings.

[0021] like Figure 1 As shown, a cutting fixture for the riser of an ultra-high voltage GIS cover plate casting includes a parts fixture frame, a working platform 7, a support platform 11, and a rotating mechanism 14.

[0022] like Figure 4 As shown, the parts fixture rack consists of an upper layer 10 and a lower layer 8. The layer height is set according to the characteristics of the cover plate casting to ensure that the cover plate casting can be completely fitted into the parts fixture rack. Each layer is composed of a ring-shaped steel pipe. The upper layer 10 and the lower layer 8 are connected by eight columns. The upper layer 10 contacts the back of the flange of the cover plate casting, and the lower layer 8 contacts the work platform 7. The fastening mechanism ensures that the cover plate casting is tightly fitted to the upper layer 10 and the lower layer 8 is tightly fitted to the work platform 7. Fastening is achieved quickly with bolts. Four sets of fastening mechanisms are evenly distributed in each layer of the upper layer 10 and the lower layer 8. The upper fastening mechanism fixes the cover plate casting to the upper layer 10, and the lower fastening mechanism fixes the lower layer 8 to the work platform. The work platform 7 is a carbon steel plate with a thickness of more than 20mm, which can provide overall support for the parts tooling frame. The work platform 7 has multiple threaded holes for fastening, and the lower layer of the parts tooling frame can be tightly connected to the work platform through fastening fixtures.

[0023] like Figure 2As shown, the support platform 11, located below the working platform 7 and the rotating mechanism 14, is welded from steel pipes and provides stable support for the rotating mechanism 14 and the working platform. It has four supporting columns 16 at its bottom, responsible for supporting the entire fixture. Seven auxiliary metal rollers 5 are evenly distributed between the support platform 11 and the working platform 7. These auxiliary metal rollers 5 are tightly connected to the support platform 11 by bolts. During the rotation of the working platform 7, they assist in supporting the working platform and reduce frictional resistance through rolling.

[0024] Rotating mechanism 14: mainly a servo motor system, which uses a motor to drive the work platform to rotate, and the rotation speed is stable and controllable.

[0025] A controllable rotating mechanism 14 is fixed on the platform support mechanism 11, and seven rollers 5 are installed at the lower front end of the platform support mechanism; the rollers 5 are fixed to the support platform 11 by roller fastening bolts 15.

[0026] When installing the cover plate casting, the lower layer 8 of the tooling frame is secured to the working platform 7 by four tooling frame fasteners 12 and locked with the second bolt 13. The cover plate casting 1 is secured to the upper layer 10 of the tooling frame by four cover plate fasteners 3 and the first bolt 4. The rotating mechanism 14 drives the working platform 7, thereby driving the cover plate casting 1 and the riser 2 to rotate. At the same time, the roller 5 rolls together. After the cutting system 6 is started, it can be operated manually to achieve up and down movement.

[0027] like Figure 3 As shown, the working process of this utility model is as follows: 1. Use four tooling bracket fasteners 12 and the second bolts 13 to lock and fix the lower layer 8 of the tooling bracket onto the work platform 7; 2. Place the cover plate casting 1 on the upper layer 10 of the tooling frame and tighten it using the four cover plate fastening clips 3 and the first bolt 4; 3. Start the rotating mechanism 14 to make the cover plate casting 1 start to rotate, while the roller 5 rolls below to assist in the rotation. After the cover plate casting rotates a certain angle, it stops, so that one riser 2 is at the top. 4. The cutting system 6 is started and begins to move downwards, cutting off the riser 2 before rising back to its initial position; 5. Restart the rotating mechanism 14 to rotate the cover plate casting 1, placing the other riser 2 at the top, and repeat steps 3 and 4; 6. After all risers 2 have been cut, quickly unlock the cover plate fastening buckle 3 and the first bolt 4, and the cover plate casting 1 with the risers cut can be taken out, thus realizing the controllable cutting of the cover plate casting 1.

[0028] Repeat steps 2-6 to complete the cutting of the riser in the cover plate casting.

[0029] Because this utility model has a rotating mechanism, this design facilitates the controllable rotation of parts during riser cutting, which helps to reduce labor intensity. Because this utility model adds auxiliary rollers, it can achieve the effects of rotational support and rotational lubrication of the worktable; This utility model adopts a bolt fastening method to achieve fastening and quick disassembly of the cover plate parts. The fastening clamp fits tightly with the parts rack, which can ensure stability and reliability when fastening large parts. The tooling frame used in this utility model can be used for heavy and large-sized UHV GIS cover plate parts, meeting the cutting requirements of complex structure cover plate risers; This utility model has a reasonable solution, a simple structure, and is easy to implement, and can give full play to the advantages of easy and controllable rotation during the cutting process of cover plate-type parts.

[0030] Example 2 See Figures 1-4 This embodiment provides a cutting fixture for risers in UHV GIS cover plate castings, aiming to solve the problems of high labor intensity, poor safety, low efficiency, and unstable cutting quality in existing technologies for manually cutting risers. This fixture, through the integration of clamps, a rotating platform, and an auxiliary support system, achieves mechanized and automated cutting of risers in large cover plate castings.

[0031] The cutting fixture mainly includes a support platform 11, a rotating mechanism 14, a working platform 7, a parts fixture frame, and an auxiliary support system.

[0032] The support platform 11, serving as the foundation of the entire equipment, is welded from high-strength steel pipes. Four supporting columns 16 are located at its base to ensure the stability of the entire fixture on the ground. The core function of the support platform 11 is to support the upper rotating mechanism 14 and the working platform 7.

[0033] The rotating mechanism 14 is preferably a servo motor system, which is securely mounted at the center of the support platform 11 by bolts. The output shaft of the servo motor is coaxially connected to the upper working platform 7, and can receive commands from the control system to drive the working platform 7 to rotate 360 ​​degrees at a stable, precise and controllable speed.

[0034] The working platform 7 is a 25mm thick circular carbon steel plate, which has sufficient rigidity and strength to support the workpiece and tooling without deformation. The upper surface of the working platform 7 is machined with multiple threaded holes arranged in a ring array for connecting and fixing with the part tooling.

[0035] The fixture is a specialized clamp for directly mounting the cover plate casting 1. Its design height is determined based on the structural characteristics of the UHV GIS cover plate, ensuring that the casting can be securely embedded within it. The fixture mainly consists of three parts: The lower layer 8 of the tooling frame is a frame made of ring-shaped steel pipes, which is locked and fixed to the work platform 7 by four sets of lower layer fastening mechanisms (in this example, tooling frame fastening buckles 12 and second bolts 13).

[0036] Upper layer 10 of the tooling rack: A frame made of annular steel pipes, the dimensions of which match the profile of the flange back of the cover plate casting 1 to ensure sufficient contact surface.

[0037] Tooling frame uprights 9: There are 8 in total, which are vertically welded between the upper and lower frames to connect the two into a high-strength integral rigid structure.

[0038] The cover plate casting 1 is pressed and fixed on the upper layer 10 of the tooling frame by four sets of upper fastening mechanisms (in this example, cover plate fastening buckle 3 and first bolt 4).

[0039] The auxiliary support system consists of seven rollers 5. These rollers 5 are evenly mounted on an annular track on the upper surface of the support platform 11 by roller fastening bolts 15, with their rims in contact with the bottom surface of the working platform 7. When the working platform 7 is driven to rotate by the rotating mechanism 14, these rollers 5 roll accordingly, providing additional auxiliary support to the working platform 7 to prevent it from tilting due to eccentric loads. Furthermore, by replacing sliding friction with rolling friction, the rotational resistance is greatly reduced, allowing the servo motor to drive the load more smoothly and effortlessly.

[0040] The working process of this embodiment is as follows: Fixture fixing: The operator uses 4 sets of fixture brackets to fasten the buckles 12 and the second bolts 13 to securely lock the lower layer 8 of the fixture bracket to the predetermined position on the work platform 7.

[0041] Workpiece clamping: The cover plate casting 1 to be processed is hoisted into the fixture, so that the back of its flange rests on the upper layer 10 of the fixture frame. Then, using 4 sets of cover plate fastening clips 3 and the first bolt 4, force is applied evenly around the flange circumference to reliably lock the cover plate casting 1 onto the upper layer 10 of the fixture frame.

[0042] Rotational positioning: The servo motor of the rotating mechanism 14 is activated, driving the work platform 7 and the fixed cover plate casting 1 to rotate together, and the rollers 5 below roll smoothly. The control system rotates the workpiece to a specific angle (depending on the number of risers) and then stops, so that the first riser 2 to be cut stops precisely below the cutting equipment 6 (such as a band saw, circular saw or flame cutter).

[0043] Riser cutting: The cutting device 6 is controlled to feed downwards, smoothly removing the riser 2 located at the highest point. After completion, the cutting device 6 rises back to the initial position.

[0044] Repeat the operation: Restart the rotating mechanism 14 to rotate the next riser 2 to the cutting station and repeat the cutting process of step 4.

[0045] Workpiece unloading: After all risers 2 have been cut off in sequence, loosen and remove all cover plate fasteners 3 and first bolts 4, and the cover plate casting 1 with the riser cut completed can be lifted off the fixture to prepare for the processing of the next workpiece.

[0046] As can be seen from the above process, this utility model transforms the heavy and dangerous manual operation into a mechanized clamping-rotation-cutting cycle, which can be operated by a single person. This significantly reduces labor intensity and skill requirements, greatly improves operational safety and production efficiency, and at the same time ensures the consistency of the cutting position and improves the processing quality.

[0047] One preferred embodiment of the cutting process of the UHV GIS cover plate casting riser cutting fixture includes the following steps: When the fixture equipped with the cover plate casting riser cutting fixture is in operation, the cover plate-like parts are fastened to the worktable by fastening bolts. The cutting saw blade moves from top to bottom directly above the cover plate-like parts, removing the casting riser during the movement. By driving the rotating mechanism to rotate, the cover plate-like casting is rotated, rotating the remaining riser to the top. The cutting saw blade then moves from top to bottom again to remove the casting riser. This process is repeated to achieve complete removal of all risers on the cover plate-like parts. After the cover plate casting riser is removed, its gate is then removed manually, which is not described further in this patent.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. When a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0054] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. An EHV GIS cover plate casting riser cutting tooling, characterized in that, include: Work platform (7), support platform (11), rotating mechanism (14) and parts tooling rack; The support platform (11) is located below the working platform (7); the rotating mechanism (14) is driven to connect with the working platform (7) and is used to drive the working platform (7) to rotate; The part fixture includes a lower fixture (8), an upper fixture (10), and multiple fixture columns (9) connecting the lower fixture (8) and the upper fixture (10). Multiple rollers (5) are provided between the support platform (11) and the working platform (7).

2. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 1, characterized in that, The upper layer (10) of the tooling frame is tightly connected to the cover plate casting (1) through an upper fastening mechanism; the lower layer (8) of the tooling frame is connected to the work platform (7) through a lower fastening mechanism.

3. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 2, characterized in that, The lower fastening mechanism includes multiple tooling fastening buckles (12) and a second bolt (13). The tooling fastening buckles (12) are locked by the second bolt (13) so that the lower layer (8) of the tooling is pressed and fixed on the work platform (7).

4. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 2, characterized in that, The upper fastening mechanism includes multiple cover plate fastening buckles (3) and a first bolt (4). The cover plate fastening buckles (3) are locked by the first bolt (4) so ​​that the cover plate casting (1) is pressed and fixed on the upper layer (10) of the tooling frame.

5. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 2, characterized in that, Both the lower-level fastening mechanism and the upper-level fastening mechanism are provided in at least four sets, and are evenly distributed.

6. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 1, characterized in that, The wheel surface of the roller (5) contacts the bottom surface of the work platform (7) to assist in support and reduce the frictional resistance when the work platform (7) rotates.

7. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 1, characterized in that, The support platform (11) is provided with a support column (16) at its bottom.

8. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 1, characterized in that, The number of rollers (5) is seven, and they are fixed to the support platform (11) by roller fastening bolts (15).

9. The riser cutting tool for ultra-high voltage GIS cover plate castings according to claim 1, characterized in that, The rotating mechanism (14) is a servo motor system, the output of which is connected to the working platform (7) to provide a stable and controllable rotation speed.

10. A riser cutting tool for an ultra-high voltage GIS cover plate casting according to claim 1, characterized in that, The working platform (7) is a carbon steel plate with a thickness of more than 20 mm, and has multiple threaded holes.

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