A tooling for machining the inner holes of large-diameter segmented circular headers.

Abstract

This utility model discloses a tooling for machining the inner holes of a large-diameter segmented circular header. It includes an arc plate, fixing components, and positioning components. The arc plate is rolled from steel plate, and its inner wall conforms to the outer wall of the circular header. Multiple fixing components are symmetrically arranged in pairs on both sides of the arc plate to fix the positions of the two sides of the circular header. The positioning components are located at the ends of the arc plate, corresponding to an external hoisting mechanism, to fix the positions of the two ends of the circular header. This utility model provides a natural radial reference by using the arc plate, achieving rapid initial positioning. The fixing components on both sides of the arc plate act as clamps, ensuring the accuracy of the drilling position. Simultaneously, the positioning components at the ends ensure the accuracy of the axial dimensions. This tooling solves the clamping and positioning problems of machining 90° directional holes on the inner side of a segmented circular header using a drilling machine, and has a simple structure, is easy to operate, and has low manufacturing costs.

Description

Technical Field

[0001] This utility model relates to the field of header drilling technology, specifically to a tooling for machining the inner holes of large-diameter segmented circular headers. Background Technology

[0002] In power plant boiler manufacturing, the circular headers in cyclone separators are relatively large, with a median diameter of approximately 9 meters, and are typically constructed using a segmented, spliced ​​structure. Multiple holes are distributed around the top surface and the inner and outer 90° circumference of the circular header. The holes on the inner 90° direction are generally machined using a drilling machine, requiring the circular header to be upright with the holes aligned with the drill bit. Due to the large size and heavy weight of the circular header, clamping and positioning during upright installation is difficult, leading to machining difficulties, low efficiency, and safety hazards. Current technology lacks specialized tooling for machining the inner holes of such large-diameter, segmented circular headers; therefore, a dedicated tooling with a simple structure, convenient operation, and accurate positioning is urgently needed. Utility Model Content

[0003] The purpose of this invention is to provide a tooling for machining the inner holes of large-diameter segmented circular headers, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides a tooling for processing the inner side holes of a large-diameter segmented circular header, which includes an arc plate, a fixing component, and a positioning component. The arc plate is made of rolled steel plate and its inner wall is adapted to the outer wall of the circular header. There are multiple fixing components, which are symmetrically arranged in pairs on both sides of the arc plate and are used to fix the position of the two sides of the circular header. The positioning component is located at the end of the arc plate and corresponds to the external hoisting mechanism to fix the position of the two ends of the circular header.

[0005] Furthermore, the fixing assembly includes a nut, a bolt, and a washer. The nut is fixedly mounted on the arc plate, the threaded end of the bolt is threadedly connected to the nut, and the washer is installed between the circular header and the bolt.

[0006] Furthermore, the fixing assembly also includes a washer, the nut is connected to the arc plate through the washer, the washer has a mounting hole, and the inner wall of the mounting hole is threadedly connected to the threaded end of the bolt.

[0007] Furthermore, the gasket is made of asbestos.

[0008] Furthermore, the positioning component includes a baffle that is longitudinally mounted at the end of the arcuate plate.

[0009] Furthermore, the positioning component also includes a positioning block, which is installed between the baffle and the circular header and contacts the end faces of the baffle and the circular header.

[0010] Furthermore, the baffle is slidably connected to and detachably connected to the arc plate.

[0011] Furthermore, it also includes multiple support plates, which are fixedly installed at intervals on the inner side of the arc plate. The top of each support plate has an arc-shaped groove adapted to the circular header, and a set of fixing components is provided at both ends of the top of the support plate.

[0012] Furthermore, the support plate is provided with stiffening plates on both sides of its bottom, and the stiffening plates connect the arc plate and the support plate.

[0013] The beneficial effects of this utility model are as follows: By setting up an arc plate, this utility model provides a natural radial reference, achieving rapid initial positioning. The fixing components on both sides of the arc plate not only serve a clamping function but also have a circumferential fine-tuning function, ensuring the accuracy of the drilling position. Simultaneously, the positioning components at the ends ensure the accuracy of the axial dimensions. This fixture solves the clamping and positioning problem of 90° directional holes inside segmented circular headers in drilling machines, and it has a simple structure, is easy to operate, and has low manufacturing costs. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0015] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of AA.

[0016] The components include: 1. Arc plate; 2. Fixing component; 3. Positioning component; 4. Support plate; 5. Rib plate; 6. Lifting mechanism.

[0017] 21. Nut; 22. Bolt; 23. Washer; 24. Washer plate; 31. Baffle; 32. Positioning block; 61. Limiting plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0021] like Figures 1-2 As shown, this utility model discloses a tooling for processing the inner side holes of a large-diameter segmented circular header. It includes an arc plate, a fixing component, and a positioning component. The arc plate is made of rolled steel plate, and its inner wall is adapted to the outer wall of the circular header. There are multiple fixing components, which are symmetrically arranged in pairs on both sides of the arc plate and are used to fix the positions of the two sides of the circular header. The positioning component is set at the end of the arc plate and corresponds to the external hoisting mechanism to fix the positions of the two ends of the circular header.

[0022] Since the arc plate is rolled from steel plate according to the outer diameter of the circular header, this matching arc achieves preliminary and natural radial positioning of the circular header, ensuring that the center of the circular header coincides with the center of the tooling arc. The positioning component acts on the end of the circular header, cooperating with the external hoisting mechanism to determine the axial position of the circular header in the tooling, preventing it from moving along the axial direction.

[0023] The fixing components act symmetrically on both sides of the circular header (radial clamping), forming a three-point positioning system (one clamp at each end) together with the positioning components. This eliminates the possibility of movement of the circular header within the tooling and achieves precise axial and circumferential positioning.

[0024] In this embodiment, a hoisting mechanism is installed at the first end of the arc plate, and a positioning component is located at the second end of the arc plate. The positioning component can be a liftable or pluggable positioning pin, which fixes both ends of the circular header between the hoisting mechanism and the positioning component. Furthermore, the circular header is clamped from both sides by fixing components symmetrically arranged on both sides of the arc plate. This not only prevents the circular header from rolling or rotating within the arc plate, but more importantly, by adjusting the tightness of the screws on both sides, the circumferential angle of the circular header within the fixture can be finely adjusted, ensuring that the inner 90° hole to be machined can be precisely adjusted to be directly opposite the drill bit. In this embodiment, the fixing component can use standard horizontal, vertical, or C-shaped quick clamps (such as elbow clamps or clamping clamps) available on the market, which can be quickly opened and closed by operating the handle. After machining one hole, the operator can control the hoisting mechanism to move the arc plate, allowing the arc plate to move left, right, or tilt, thereby moving the entire fixture so that the next hole to be machined is moved below the drill bit and perpendicular to it. The mobility of the tooling allows for very rapid hole position changes without the need for repeated hoisting and adjustment of the workpiece itself.

[0025] This invention provides a natural radial reference by using an arc plate, enabling rapid initial positioning. The fixing components on both sides of the arc plate not only clamp the hole but also provide circumferential fine-tuning, ensuring the accuracy of the drilling position. Simultaneously, the positioning components at the ends guarantee the accuracy of the axial dimensions. This fixture solves the clamping and positioning problems of drilling 90° holes inside segmented circular headers on a drilling machine, and is simple in structure, easy to operate, and has low manufacturing costs.

[0026] In one embodiment, the fixing assembly includes a nut, a bolt, and a washer. The nut is fixedly mounted on the arc plate, the threaded end of the bolt is threadedly connected to the nut, and the washer is installed between the circular header and the bolt.

[0027] Since the nut is pre-fixed on the arc plate, the operator uses a wrench to rotate the bolt, which gradually extends towards the top of the circular header (the threaded end of the bolt) through the threaded engagement with the nut. At the same time, a washer is placed between the threaded end of the bolt and the circular header, and the top of the bolt is finally pressed against the outer wall of the circular header by the washer.

[0028] By symmetrically tightening multiple sets of bolts on both sides of the arc plate, a uniform, centripetal clamping force is formed, firmly "holding" the circular header within the fixture. The operator can easily and precisely control the bolt extension using a wrench, thereby achieving fine and controllable micro-adjustments to the circumferential position of the clamped circular header, enabling high-precision drilling. The shims increase the contact area between the bolt head and the circular header body, dispersing the clamping force and preventing the bolt head from directly pressing against the header body, thus avoiding localized plastic deformation or scratches.

[0029] In one embodiment, the fixing assembly further includes a washer. The nut is connected to the arc plate via a washer, the washer having mounting holes whose inner walls are threaded to the threaded end of the bolt. The washer (typically a steel plate of a certain thickness and area) is welded or otherwise fixed to the arc plate. The nut is welded to this washer. When the bolt is tightened, the enormous clamping force acts first on the washer, then is distributed by the washer to a larger area, and then transmitted to the main body of the arc plate, preventing the arc plate from being locally bent, deformed, or even torn.

[0030] In one embodiment, the gasket is made of asbestos. This provides better protection for the finished outer surface of the round header, preventing indentations or scratches.

[0031] In one embodiment, the positioning component includes a baffle plate longitudinally mounted at the end of the arc-shaped plate. In this embodiment, when the circular header is hoisted and placed into the arc-shaped plate, the operator will tightly fit one end face of it against the inner side of the baffle plate, while the other end face is clamped by a hoisting mechanism. For example, the clamping end of the hoisting mechanism is provided with a limiting plate. When the clamping end of the hoisting mechanism is installed at the second end of the arc-shaped plate, the limiting plate fits against the end face of the circular header and pushes the circular header towards the first end of the arc-shaped plate until the circular header fits tightly against the baffle plate, thus clamping the circular header between the baffle plate and the limiting plate on the hoisting mechanism.

[0032] In one embodiment, the positioning component further includes a positioning block, which is installed between the baffle and the circular header and contacts the end faces of both the baffle and the circular header. In another embodiment, the baffle and the circular header are welded together, i.e., the baffle and the circular header are fixedly connected.

[0033] For circular headers of different lengths or end face structures, if the limiting plate cannot clamp the circular header even when moved to the innermost end, it can be adapted by replacing the positioning blocks with positioning blocks of different sizes or shapes without modifying the main structure of the tooling. Furthermore, as wear-prone parts, the positioning blocks can be quickly and individually replaced after wear, resulting in low cost and high efficiency.

[0034] In one embodiment, the baffle is slidably and detachably connected to the arc plate. Specifically, in this embodiment, a guide rail, groove, or T-slot can be provided at the end of the arc plate, allowing the baffle to move smoothly along the arc plate within a certain travel range. Once in the desired position, the baffle is locked in a specific position within the groove using a mechanism such as a positioning bolt, pin, or quick-clamp. When needed, these connecting parts can be loosened, allowing the baffle to slide or be completely removed.

[0035] In one embodiment, the fixture further includes multiple support plates, which are fixedly installed at intervals on the inner side of the arc-shaped plate. The top of each support plate has an arc-shaped groove adapted to the circular header, and both ends of the top of the support plate are equipped with a set of fixing components. The arc-shaped plate and the multiple spaced support plates together constitute the main load-bearing and stress-bearing skeleton of the fixture. They distribute the concentrated load to multiple points, making the fixture a highly rigid, deformation-resistant, and robust platform, ensuring the stability of the fixture under heavy loads and cutting forces, thereby directly guaranteeing machining accuracy. In this embodiment, a pad is installed on the support plate, and a nut is installed on the pad.

[0036] In one embodiment, stiffening ribs are provided on both sides of the bottom of the support plate, connecting the arc plate and the support plate. The stiffening ribs on both sides of the bottom of the support plate form a stable triangular support structure between the support plate and the arc plate. The triangular structure has extremely high mechanical stability, greatly enhancing the rigidity of the connection point, resisting bending and torsional deformation, and ensuring that the tooling maintains its original shape under heavy loads.

[0037] The usage process of this utility model embodiment is as follows:

[0038] In this embodiment, an arc-shaped plate is provided, with multiple support plates spaced apart on the inner side of the arc-shaped plate. Each support plate has stiffeners on both sides. A pad is welded to both ends of the top of each support plate, and a nut is welded to the inner side of the pad. A baffle is provided at the first end of the arc-shaped plate.

[0039] The circular header is placed inside the fixture, its weight supported by the arc-shaped groove on the top of the support plate, completing the initial positioning. The first end of the arc plate is supported by a baffle. When the clamping end of the lifting mechanism is installed at the second end of the arc plate, the limiting plate abuts against the end face of the circular header, pushing the circular header towards the first end of the arc plate until the circular header and the baffle are tightly fitted, thus clamping the circular header between the baffle and the limiting plate on the lifting mechanism, completing the axial limiting of the circular header. In Embodiment 1, when the baffle is fixed, a positioning block can be placed between the baffle and the circular header to accommodate headers of different sizes. In Embodiment 2, when the baffle is slidable, it can be directly slid to a suitable position and then detachably connected to the arc plate.

[0040] Rotate the bolt to engage with the nut thread. Simultaneously, place a washer between the bolt thread end and the circular header. The bolt thread end contacts the washer, thus tightening the circular header and fixing both sides of it. The washer and pad effectively transmit and distribute the clamping force. After machining one hole, the operator can use the lifting mechanism to move the arc plate. For example, lifting the arc plate a second time allows the operator to move its position and angle, enabling left-right or tilting movement, thereby moving the entire fixture to position the next hole to be machined below the drill bit and perpendicular to it. The fixture's mobility allows for very rapid hole position changes without the need for repeated lifting and adjustment of the workpiece itself. Because the fixture has an arc-shaped surface, it facilitates adjusting the hole position and movement. Supported by a central support plate, the header is positioned by screws on both sides after clamping.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tooling for machining the inner holes of a large-diameter segmented circular header, characterized in that: It includes an arc plate, a fixing component, and a positioning component. The arc plate is made of rolled steel plate and its inner wall is adapted to the outer wall of the circular header. There are multiple fixing components, which are symmetrically arranged in pairs on both sides of the arc plate and are used to fix the position of the two sides of the circular header. The positioning component is located at the end of the arc plate and corresponds to the external hoisting mechanism to fix the position of the two ends of the circular header.

2. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 1, characterized in that: The fixing assembly includes a nut, a bolt, and a washer. The nut is fixedly mounted on the arc plate, the threaded end of the bolt is threadedly connected to the nut, and the washer is installed between the circular header and the bolt.

3. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 2, characterized in that: The fixing assembly also includes a pad, the nut is connected to the arc plate through the washer, the washer has a mounting hole, and the inner wall of the mounting hole is threaded to the threaded end of the bolt.

4. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 2, characterized in that: The gasket is made of asbestos.

5. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 1, characterized in that: The positioning component includes a baffle that is longitudinally mounted at the end of the arc plate.

6. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 5, characterized in that: The positioning component further includes a positioning block, which is installed between the baffle and the circular header and contacts the end faces of the baffle and the circular header.

7. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 5, characterized in that: The baffle is slidably connected to the arc plate and is detachably connected.

8. The tooling for machining the inner holes of a large-diameter segmented circular header according to claim 1, characterized in that: It also includes multiple support plates, which are fixedly installed at intervals on the inner side of the arc plate. The top of each support plate has an arc-shaped groove adapted to the circular header, and a set of fixing components is provided at both ends of the top of the support plate.

9. A tooling for machining the inner hole of a large-diameter segmented circular header according to claim 8, characterized in that: The support plate has stiffening ribs on both sides of its bottom, and the stiffening ribs connect the arc plate and the support plate.

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