Seat ring boring device

Abstract

The utility model provides a seat ring bore processingequipment relates to the technical field of machining equipment, include: main body, it includes the bed body, sets up on the slide of bed body, vertical installation on the vertical column of slide, and install vertical milling head in the vertical column front end, modularization auxiliary support device, it includes at least two sets of alternate use's support unit. The utility model has the beneficial effect: through the three point formula spot welding fixed after the support frame bottom arc surface and seat ring surface fit, cooperation adjustment pressure tight mechanism quick assembly and disassembly connection main body, can make main body and seat ring connection is used for the hole processing of local area, improves the effective cutting time proportion through the double position alternate use simultaneously, single seat ring processing period shortens to 36 hours from 72 hours, the efficiency is promoted, combines ISO50 main shaft, half closed loop servo drive and organ type protective cover, ensures the precision and reliability of long time continuous processing under the environment of strong vibration, more dust of power station site.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a device for boring holes in a seat ring. Background Technology

[0002] The turbine mounting ring is a key load-bearing component of the hydro-generator unit. The connection between the mounting ring and the top cover and bottom ring requires the mating hole plane to meet the surface roughness requirements of Ra3.2μm and the levelness requirements of less than 0.02mm. As the single unit capacity of hydropower stations increases, the size of the mounting ring can reach several meters, which exceeds the processing range of existing general-purpose machine tools.

[0003] Traditional processing methods require completion at the manufacturing plant, but large seat rings are difficult to transport and deform after on-site installation, necessitating secondary precision machining on-site. However, the limited space inside the power plant makes it impossible to install fixed large boring and milling equipment; manual scraping or processing with small hand tools is inefficient and difficult to guarantee accuracy. Therefore, there is an urgent need for a specialized processing equipment that is compact, easy to assemble and disassemble on-site, and has high positioning accuracy. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides a device for boring a seat ring.

[0005] An embodiment of this utility model provides a device for boring a seat ring, comprising: The main body includes a bed, a slide mounted on the bed, a column vertically mounted on the slide, and a vertical milling head mounted on the front end of the column; A modular auxiliary support device includes at least two sets of alternately used support units. Each support unit includes two support frames whose bottom contours match the curvature of the seat ring surface, a support plate assembly detachably connected to the support frame, and an adjustment and clamping mechanism disposed on the support frame. The support plate assembly is fixedly connected to the bed, and the adjustment and clamping mechanism is used to adjust the support frame laterally and horizontally, and to press and fix the support frame to the surface of the machined seat ring.

[0006] Furthermore, the modular auxiliary support device is configured in two sets, and the two modular auxiliary support devices are used alternately between continuous workstations. Each modular auxiliary support device uses two support frames and one support plate assembly to switch workstations.

[0007] Furthermore, the adjusting and pressing mechanism includes a side top adjusting unit, a horizontal adjusting unit, and a pressure plate fixing unit, wherein the pressure plate fixing unit is configured to temporarily fix the support frame and the seat ring by spot welding.

[0008] Furthermore, the main body adopts a three-axis linkage structure, which includes horizontal movement of the column relative to the slide in the X-axis direction; horizontal movement of the slide relative to the bed in the Y-axis direction; and vertical lifting and lowering movement of the vertical milling head relative to the column in the Z-axis direction.

[0009] Furthermore, the three-axis linkage structure is driven by AC servo motors through ball screw pairs and equipped with an encoder semi-closed-loop control system. The positioning accuracy of each axis is 0.04mm and the repeatability is 0.02mm.

[0010] Furthermore, the spindle taper of the vertical milling head has an ISO50 / 7:24 standard taper, and the spindle speed range is 10 to 600 r / min, driven by a 4kW AC variable frequency motor with stepless speed regulation.

[0011] Furthermore, the guide rails of the bed, the slide, and the column all adopt a centralized lubrication system with automatic lubrication pump oil supply, and the guide rails are protected by accordion-style protective covers.

[0012] Furthermore, it also includes a CNC system, which is equipped with an electrical control cabinet and a portable operating box, and each feed axis is equipped with a safety limit switch.

[0013] Furthermore, the bottom contour of the support frame matches the curvature of the seat ring surface, and the support plate assembly is quickly positioned and connected to the bed through locating pins and bolts.

[0014] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows: The seat ring boring processing device of this utility model is fixed by three-point spot welding after the bottom arc surface of the support frame is attached to the surface of the seat ring. With the help of the adjustment and clamping mechanism, the main body can be quickly disassembled and connected. The main body can be connected to the seat ring for hole processing in local areas. At the same time, the effective cutting time ratio is increased by alternating use of dual workstations. The processing cycle of a single seat ring is shortened from 72 hours to 36 hours, thus improving efficiency. Combined with the ISO50 spindle, semi-closed-loop servo drive and bellows-type protective cover, the accuracy and reliability of long-term continuous processing in the strong vibration and dusty environment of the power station site are ensured. Attached Figure Description

[0015] Figure 1 This is a front view of the main body of the machine tool for boring holes in the seat ring of this utility model; Figure 2 This is a side view of the main body of the machine tool for boring holes in the seat ring of this utility model; Figure 3 This is a top view of the modular auxiliary support device and the connection between the seat ring and the present invention's seat ring boring processing device; Figure 4This is a schematic diagram of the upper ring boring structure of an embodiment of the seat ring boring processing device of this utility model; Figure 5 This is a schematic diagram of the lower ring boring structure of an embodiment of the seat ring boring processing device of this utility model.

[0016] In the diagram: 1. Main unit; 11. Bed; 12. Slide; 13. Column; 14. Vertical milling head; 2. Modular auxiliary support device; 21. Support frame; 22. Support plate assembly; 23. Adjustment and clamping mechanism; 231. Side top adjustment unit; 232. Horizontal adjustment unit; 233. Pressure plate fixing unit; 3. Seat ring; 31. Guide vane; 4. Electrical control cabinet. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0018] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0019] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0021] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0022] It should be further noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Please refer to Figures 1 to 3 The present invention provides a device for boring a seat ring, which includes two main parts: a main body 1 and a modular auxiliary support device 2.

[0024] The main body 1 is a compact three-axis boring and milling unit, rigidly connected to the modular auxiliary support device 2. The modular auxiliary support device 2 is directly supported on the bearing ring 3 to be machined, and the whole machine is positioned through a multi-point adjustable fixing structure. This separate bearing structure effectively solves the problem of precision machining of large workpieces under conditions where there is no fixed foundation on site.

[0025] In this embodiment, the bed 11 is preferably integrally cast from HT300 high-strength cast iron, forming a clearance fit with the support plate assembly 22 to achieve positioning of the bed 11 and the support plate assembly 22.

[0026] Furthermore, the slide 12 is connected to the bed 11 via a heavy-duty roller linear guide pair. The guide pair includes a guide rail, a slider, and rolling elements. The guide rail is fixed on the machined surface of the bed 11, and the slider is connected to the bottom surface of the slide 12. The preload of the guide pair is achieved by adjusting the shims. The thickness of the shims is selected according to the actual assembly measurement value to ensure the preload of the guide pair.

[0027] The high rigidity and low friction characteristics of the roller guide pair not only ensure the positioning accuracy of 0.04mm on the Y-axis, but also increase the overturning stiffness of the slide 12 to ≥120N / μm when subjected to the eccentric cutting force of the vertical milling head 14, significantly reducing machining vibration marks.

[0028] Similarly, column 13 is vertically mounted on the vertical mounting surface of slide 12 via another set of roller linear guides, serving as the support base component for vertical milling head 14. The connection structure of column 13 is similar to that of slide 12 and bed 11 in terms of guide rail pre-tightening method, the difference being that a 0.02mm thick copper adjusting shim is added between the mounting reference surface of column 13 and the vertical mounting surface of slide to compensate for machining and assembly errors.

[0029] In this embodiment, the vertical milling head 14 adopts a rectangular ram structure, which is embedded in the U-shaped guide groove at the front end of the column 13 through a ball bearing linear guide pair. The slider of the guide pair is connected to the side wall of the ram, and the guide rail is adjustablely connected to the U-shaped groove of the column.

[0030] Because the electrical and hydraulic systems are centrally located on the dedicated machine, it only needs to be connected to an external power source to operate, making hoisting and adjustment very convenient.

[0031] The support plate assembly 22 is fixedly connected to the support frame 21 by bolts. Each support frame 21 has an arc-shaped pad welded to its bottom. The radius of curvature of the arc-shaped pad is consistent with the theoretical radius of the inner surface of the seat ring 3. The adjusting and pressing mechanism 23 includes a side top adjusting unit 231, a horizontal adjusting unit 232, and a pressure plate fixing unit 233. The pressure plate is connected to the support plate assembly 22 through the adjusting and pressing mechanism 23.

[0032] Please refer to Figure 3 During on-site installation, the support frame 21 is first fixed to the gap position of multiple guide vanes 31 of the seat ring 3 by means of clamps. The clamps are located between two holes to be bored, which does not affect the processing. The support frame 21 extends out of the ring plate of the seat ring 3. The support plate assembly 22 is laid on the extended part, and the main body 1 is installed on the support plate and the position is adjusted by adjusting the clamping mechanism 23. The holes in a local area of ​​the seat ring 3 are processed.

[0033] In one specific embodiment, the two support frames 21 utilize the gaps of the four guide vanes 31 to form a set of support units on the support plate assembly 22. When one set of support units is used for processing, the other set can be installed at the next work station to save preparation time.

[0034] like Figure 3 As shown, two sets of modular auxiliary support devices 2 are evenly distributed around the seat ring 3. When the main body 1 is processed at the first station, the support frame 21 of the continuous second station has been pre-adjusted and spot-welded, and its support plate assembly 22 is in a state of waiting to be installed. After the processing at the first station is completed, the adjusting clamping mechanism 23 is released, and the main body 1 is hoisted as a whole onto the support plate assembly 22 of the second station. It is then installed again by adjusting the clamping mechanism 23, and the processing at the second station can be started. At this time, the support plate assembly 22 of the first station is removed, and its support frame 21 is de-welded and moved to the third station for reinstallation.

[0035] This design, through continuous machining by the main machine and parallel preparation of auxiliary tools, improves the effective cutting time of the equipment compared to traditional methods.

[0036] In an optional embodiment, the electrical control cabinet 4 is preferably installed on the rear side of the column 13. The power cables between the electrical control cabinet 4 and the three-axis servo motor and the spindle frequency converter motor are all shielded cables and connected via quick-connect aviation plugs. The encoder signal cable is a twisted-pair shielded cable with independent routing. In the strong electromagnetic interference environment of the power station, the failure rate of the CNC system is reduced.

[0037] In addition, each feed axis is equipped with dual safety limit switches at its extreme positions. The hard limit switches are Schneider Electric XCM series mechanical limit switches, which are rigidly fixed to both ends of the guide rail by L-shaped brackets.

[0038] In this embodiment, the guide rail lubrication adopts an independent automatic lubrication pump, and the guide rail protection of the X, Y and Z axes all adopts accordion-style protective covers. One end of the protective cover is fixed to the stationary part, and the other end is clamped to the moving part.

[0039] Example 1: Please refer to Figure 4 Taking the machining of the φ160mm plane connecting the seat ring and top cover of the Tabera power station as an example, for machining the 120-M72 hole on the top cover of the seat ring 3, a support frame 21 needs to be installed at the bottom of the upper ring plate of the seat ring 3. The support frame 21 is fixed to the upper ring plate with a clamp and extends out of the ring plate. A support plate assembly 22 is laid on the extended part, and the support plate assembly 22 is fixed to the support frame 21 with bolts. Then, the main body 1 can be adjusted on the support plate assembly 22 to machine the hole in a local area. In order to ensure the stability and reliability of the equipment during the machining process, spot welding can be performed between the support frame 21 and the seat ring 3.

[0040] Example 2: Please refer to Figure 5 For the bottom ring of seat ring 3 with engagement hole 144-Φ52, a support frame 21 needs to be installed at the bottom of the lower ring plate of seat ring 3. The support frame 21 is fixed to the lower ring plate with clamps. Due to the small installation space of the lower ring plate, a triangular frame is used. The support ribs at the bottom of the lower ring plate are supported by set screws on the side to improve the rigidity of the support frame 21. The support frame 21 extends out of the ring plate, and a support plate assembly 22 is laid on the extended part. The support plate assembly 22 is fixed to the support frame 21 with bolts. Then, the main body 1 can be installed on the support plate and its position adjusted to process the holes in the local area.

[0041] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0042] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for boring holes in a seat ring, characterized in that, include: The main body (1) includes a bed (11), a slide (12) disposed on the bed (11), a column (13) vertically mounted on the slide (12), and a vertical milling head (14) mounted on the front end of the column (13). The modular auxiliary support device (2) includes at least two sets of alternately used support units. Each support unit includes two support frames (21) whose bottom contours match the surface curvature of the seat ring (3), a support plate assembly (22) detachably connected to the support frame (21), and an adjustment and pressing mechanism (23) disposed on the support frame (21). The support plate assembly (22) is fixedly connected to the bed (11), and the adjustment and pressing mechanism (23) is used to adjust the support frame (21) laterally and horizontally, and press the support frame (21) to the surface of the machined seat ring (3).

2. The device for boring a seat ring as described in claim 1, characterized in that: The modular auxiliary support device (2) is configured in two sets, and the two modular auxiliary support devices (2) are used alternately between continuous work stations. Each modular auxiliary support device (2) uses two support frames (21) and a support plate assembly (22) to switch work stations.

3. The device for boring a seat ring as described in claim 1, characterized in that: The adjusting and pressing mechanism (23) includes a side top adjusting unit (231), a horizontal adjusting unit (232) and a pressure plate fixing unit (233), wherein the pressure plate fixing unit (233) is configured to temporarily fix the support frame (21) and the seat ring (3) by spot welding.

4. The device for boring a seat ring as described in claim 1, characterized in that: The main body (1) adopts a three-axis linkage structure, which includes the horizontal movement of the column (13) relative to the slide (12) in the X-axis direction; the horizontal movement of the slide (12) relative to the bed (11) in the Y-axis direction; and the vertical lifting and lowering movement of the vertical milling head (14) relative to the column (13) in the Z-axis direction.

5. The device for boring a seat ring as described in claim 4, characterized in that: The three-axis linkage structure is driven by AC servo motors through ball screw pairs and equipped with an encoder semi-closed-loop control system. The positioning accuracy of each axis is 0.04mm and the repeatability is 0.02mm.

6. The device for boring a seat ring as described in claim 1, characterized in that: The spindle taper of the vertical milling head (14) is ISO50 / 7:24 standard taper, and the spindle speed range is 10 to 600 r / min. It is driven by a 4kW AC variable frequency motor with stepless speed regulation.

7. The device for boring a seat ring as described in claim 1, characterized in that: The guide rails of the bed (11), the slide (12) and the column (13) are all equipped with a centralized lubrication system with an automatic lubrication pump, and the guide rails are protected by a bellows-style protective cover.

8. The device for boring a seat ring as described in claim 1, characterized in that: It also includes a numerical control system, which is equipped with an electrical control cabinet (4) and a portable operation box, and each feed axis is equipped with a safety limit switch.

9. The device for boring a seat ring as described in claim 1, characterized in that: The bottom contour of the support frame (21) matches the curvature of the surface of the seat ring (3), and the support plate assembly (22) and the bed (11) are quickly positioned and connected by positioning pins and bolts.

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