Stator segment machining clamping device and clamping method

Abstract

The invention discloses a stator segment machining clamping device and a clamping method, comprising a plurality of milling supports which are mounted on a gantry milling workbench through bolts, a plurality of concave cavities evenly opened on the outer surface of the stator segment, a plurality of evenly distributed transverse plates are arranged in the concave cavities, and two ends of the transverse plates are fixedly connected to the side walls of the concave cavities; a plurality of pairs of top heads, a plurality of pairs of nut seats, a plurality of supporting bolts, two adjustment frames and at least four first positioning holes are arranged on the milling supports; each pair of top heads supports the inner wall of the concave cavity, each pair of nut seats supports the transverse plates, the adjustment frames support the side walls of the concave cavity, and the first positioning holes realize positioning installation; thus, the stator segment can be supported, fixed and accurately positioned, and the central symmetry of the stator segment is ensured; at the same time, the tooling does not adopt vertical clamping, which can avoid secondary flipping processing, reduce labor intensity and improve work efficiency.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine stator segment machining tooling, and more particularly to a stator segment machining clamping device and a clamping method. Background Art

[0002] The stator is an important core component of wind power generation equipment. Previously, the wind power field mostly used whole steel structures or cast iron parts. With the continuous expansion of offshore direct-drive high-power wind turbines, it has now expanded to more than 10MW. The diameter of the stator base is getting larger and larger. Its integral stator structure is no longer suitable for the needs of production, transportation and maintenance. It is necessary to adopt a petal structure, and at the same time, the weight of the parts must be controlled, that is, the parts are welded into components, tempered and machined; the characteristics of steel structural parts are poor workpiece rigidity and large clamping deformation, which brings great difficulties to the control of the entire machining size and precision, and it is necessary to grasp and regulate this; the existing technology processes the stator segment vertically, so the required processing machine tool specifications are large, the machine tool price is expensive, and the processing cost is high; at the same time, when processing the top of the stator segment, it is necessary to turn the workpiece over, which has a greater risk of turning the workpiece over, and the secondary clamping brings a long correction time. At the same time, the correction error will affect the dimensional accuracy and position accuracy of the workpiece, and the central symmetry of each petal is difficult to guarantee. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention provides a stator segment machining clamping device.

[0004] A stator segment machining clamping device comprises a gantry milling worktable, a milling support is detachably mounted on the upper surface of the gantry milling worktable, and the stator segment is mounted on the milling support; a plurality of concave cavities are evenly opened on the outer surface of the stator segment, a plurality of evenly distributed long holes and cross plates are arranged in the concave cavities, and the two ends of the cross plates are fixedly connected to the side walls of the concave cavities; a plurality of groups of top heads, a plurality of nut seats, a plurality of supporting bolts and four first positioning holes are arranged on the milling support; the top heads are evenly and symmetrically detachably connected to the front and rear sides of the milling support, the top heads are in contact with the inner wall of the concave cavities, and a fastening bolt is also arranged between each group of top heads, the fastening bolts are connected to the milling support through a pressure plate, and the bottom surface of the pressure plate is in contact with the outer wall of the concave cavities; the supporting bolts are evenly and symmetrically connected to the left and right sides of the milling support, and the supporting bolts are in contact with the bottom surfaces of the left and right ends of the stator segment; the nut seats are evenly and symmetrically connected to the milling support by bolts; the adjusting frame is symmetrically connected to the midpoints of the front and rear ends of the milling support by bolts; the first positioning holes are symmetrically opened at the four end corners of the milling support.

[0005] According to a preferred embodiment of the present invention, the nut seats are symmetrically distributed on both sides of the cross plate, and the nut seats include a support block, a clamping plate and a clamping bolt. The support block is detachably connected to the milling support through bolts, the support block passes through a long hole, the clamping plate and the top of the support block are fixedly connected, and the clamping bolt passes through the clamping plate and contacts the cross plate.

[0006] According to a preferred embodiment of the present invention, the adjustment frame includes a second base plate, two connecting blocks and two adjusting bolts. The connecting blocks are fixedly connected to the left and right ends of the bottom of the base plate respectively. The two adjusting bolts pass through the connecting blocks and contact the side walls of the concave cavity.

[0007] According to a preferred solution of the present invention, a second positioning hole corresponding to the first positioning hole is opened on the stator segment, and the second positioning hole and the first positioning hole are connected by a positioning pin.

[0008] According to a preferred embodiment of the present invention, the top head includes a top cover and a connecting rod, one end of the connecting rod is threaded and connected to the milling support, and the other end is integrally connected with a spherical body, and the top cover covers the spherical body and can rotate.

[0009] According to a preferred solution of the present invention, the milling support is mounted on the gantry milling workbench by bolts, and the top of the milling support is in an upwardly arched arc shape.

[0010] The clamping method using the above-mentioned stator segment machining clamping device includes the following steps: a. Install the milling support on the gantry milling worktable; b. Hang the stator segment horizontally on the milling support; c. Adjust the stator segment by adjusting the bolts, the head and the supporting bolts, and then insert the locating pin into the second locating hole and the first locating hole corresponding to the stator segment and the milling support; d. Press the pressure plate and screw in the pressure plate and the milling support at the same time with the fastening bolts to clamp the stator segment; e. Withdraw the locating pin, and the stator segment enters the processing state.

[0011] The beneficial effects of the present invention are as follows: the stator segment is installed on the milling support, and the support and fixation of the stator segment are ensured by the top head, nut seat, supporting bolt and adjusting frame on the milling support, which can effectively prevent the processing deformation of the stator segment and improve the processing accuracy of the stator segment; then, after the first positioning hole and the second positioning hole are connected by the positioning pin, it is checked whether the precise positioning conditions for the fastening support of the stator segment are met; at the same time, the tooling does not adopt vertical clamping, which can avoid secondary turning processing, reduce labor intensity and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0013] Figure 1 It is a top view of the present invention:

[0014] Figure 2 is a front view of the present invention;

[0015] Figure 3 yes Figure 1 A-direction sectional view;

[0016] Figure 4 is the front view of the adjustment frame;

[0017] Figure 5 It is the front view of the nut seat;

[0018] Among them: gantry milling table 1, positioning pin 2, stator segment 3, nut seat 4, concave cavity 5, second positioning hole 6, pressure plate 7, milling support 8, fastening bolt 9, head 10, supporting bolt 11, clamping bolt 12, adjusting bolt 13, bottom plate 14, connecting block 15, supporting block 16, cross plate 17. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0020] In the description of the invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the invention.

[0021] In the description of the invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components, and a fixed connection can be welding, gluing, etc. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1-5 As shown, a stator segment machining clamping device includes a gantry milling worktable 1, on the upper surface of which a milling support 8 is detachably mounted by bolts, and the stator segment 3 is mounted on the milling support 8; the top of the milling support 8 is an upwardly arched arc shape to prevent the arc deformation of the stator segment 3 during machining, and the stator is assembled around a circle by a plurality of stator segments 3, thereby ensuring the machining accuracy of each stator segment 3 and the central symmetry between each stator segment 3, thereby ensuring the overall accuracy of the stator after assembly.

[0023] A plurality of concave cavities 5 are evenly formed on the outer surface of the stator segment 3 . A plurality of evenly distributed long holes and a transverse plate 17 are provided in the concave cavities 5 . Both ends of the transverse plate 17 are fixedly connected to the side walls of the concave cavities 5 .

[0024] The milling support 8 is provided with a plurality of groups of plugs 10, a plurality of nut seats 4, a plurality of supporting bolts 11 and four first positioning holes; the plugs 10 and the supporting bolts 11 are provided to ensure radial fixed support of the stator segment 3, improve the radial support and fixing effect of the stator segment 3, prevent radial deformation during processing, and ensure the central symmetry of the stator segment 3; the nut seats 4 are provided to ensure longitudinal fixed support of the stator segment 3 to prevent longitudinal displacement of the stator segment 3 during processing; the adjustment frame is provided to ensure transverse fixed support of the stator segment 3 to prevent transverse displacement of the stator segment 3; at the same time, the first positioning holes symmetrically opened at each end corner of the milling support 8 and the second positioning holes 6 opened on the stator segment 3 and corresponding to the first positioning holes, when the positioning pin 2 can pass through the first positioning hole and the second positioning hole 6, the overall installation and positioning reaches the processing conditions, and the stator segment 3 can be processed.

[0025] The plugs 10 are evenly and symmetrically detachably connected to the front and rear sides of the milling support 8, the plugs 10 are in contact with the inner wall of the cavity 5, and each group of plugs 10 is also provided with fastening bolts 9, which are connected to the milling support 8 through the pressure plate 7, and the bottom surface of the pressure plate 7 is in contact with the outer wall of the cavity 5; the plug 10 includes a top cover and a connecting rod, one end surface of the connecting rod is threaded and connected to the milling support 8, and the other end is integrally connected with a spherical body, and the top cover covers the spherical body and can rotate; the plug 10 can be adjusted up and down on the milling support 8 through the thread and the spherical angle of the spherical body can be adjusted to achieve effective support of the stator segment 3 by the top cover; at the same time, by adjusting the fastening bolts 9, the pressure plate 7 is fully in contact with the outer wall of the stator segment 3, and the mutual support of the plug 10 and the pressure plate 7 improves the supporting and fastening effect, prevents radial displacement or deformation of the stator segment 3 during processing, and thus ensures the central symmetry of the stator segment 3.

[0026] The supporting bolts 11 are evenly and symmetrically connected to the left and right sides of the milling support 8, and the supporting bolts 11 are in contact with the bottom surfaces of the left and right ends of the stator segment 3; the left and right ends of the stator segment 3 are supported and adjusted by the supporting bolts 11 so that the two ends of the stator segment 3 are at the same height to prevent processing deformation and facilitate positioning.

[0027] The nut seats 4 are evenly and symmetrically connected to the milling support 8 by bolts; the nut seats 4 are symmetrically distributed on both sides of the cross plate 17, the nut seats 4 include a support block 16, a clamping plate and a clamping bolt 12, the support block 16 is detachably connected to the milling support 8 by bolts, the support block 16 passes through the long hole, the clamping plate and the top of the support block 16 are fixedly connected, the clamping bolt 12 passes through the clamping plate and contacts the cross plate 17; the nut seats 4 are symmetrically arranged, and together play a fixing and clamping role on the stator segment 3, and the two clamping bolts 12 respectively support the cross plate 17, which can prevent the stator segment 3 from being offset in the longitudinal direction, improve support and fixation, and facilitate processing.

[0028] The adjustment frame is symmetrically connected at the midpoints of the front and rear ends of the milling support 8 by bolts; the adjustment frame includes a base plate 14, two connecting blocks 15 and two adjusting bolts 13, the connecting blocks 15 are respectively fixedly connected to the left and right ends of the bottom of the base plate 14, and the two adjusting bolts 13 are respectively passed through the connecting blocks 15 and contact the side walls of the concave cavity 5; by arranging the adjustment frame at the center of the front and rear sides of the milling support 8, the side walls of the concave cavity 55 of the stator segment 3 are supported and fixed by the adjusting bolts 13 at both ends of the adjustment frame, which can directly support and fix the stator segment 3 in the lateral direction, thereby preventing the stator segment 3 from lateral displacement and affecting the processing accuracy.

[0029] The clamping method using the above-mentioned stator segment machining clamping device is as follows: first place the milling support at a suitable position on the CNC gantry milling worktable, calibrate the milling support with a dial indicator and then fix it → hoist the stator segment horizontally to a suitable position on the milling support → adjust the stator segment by adjusting the bolts, the top head, and the supporting bolts to ensure that the locating pin can be smoothly inserted into the second locating hole of the stator segment and the first locating hole of the milling support → press the pressure plate, and screw in the pressure plate and the milling support with the fastening bolts at the same time to clamp the stator segment → withdraw the locating pin, and the stator segment enters the processing state.

[0030] The above is based on the present invention as an inspiration. Through the above description, relevant staff can make various changes and modifications without departing from the technical idea of ​​this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stator segment machining clamping device, characterized in that: The invention comprises a gantry milling table (1), wherein a milling support (8) is detachably mounted on the upper surface of the gantry milling table (1), and a stator segment (3) is mounted on the milling support (8); a plurality of concave cavities (5) are evenly formed on the outer surface of the stator segment (3), wherein a plurality of evenly distributed long holes and a transverse plate (17) are provided in the concave cavities (5), and the two ends of the transverse plate (17) are fixedly connected to the side walls of the concave cavities (5); the milling support (8) is provided with a plurality of groups of plugs (10), a plurality of nut seats (4), a plurality of supporting bolts (11) and four first positioning holes; the plugs (10) are evenly and symmetrically detachably connected to the front and rear sides of the milling support (8), and the plugs (10) are connected to the front and rear sides of the milling support (8). ) and the inner wall of the cavity (5), each group of heads (10) is further provided with a fastening bolt (9), the fastening bolt (9) is connected to the milling support (8) through the pressure plate (7), the bottom surface of the pressure plate (7) and the outer wall of the cavity (5) are in contact; the supporting bolts (11) are evenly and symmetrically connected to the left and right sides of the milling support (8), the supporting bolts (11) and the bottom surfaces of the left and right ends of the stator segment (3) are in contact; the nut seat (4) is evenly and symmetrically connected to the milling support (8) through bolts; the adjustment frame is symmetrically connected to the midpoints of the front and rear ends of the milling support (8) through bolts; the first positioning holes are symmetrically opened at the four end corners of the milling support (8); The nut seat (4) is symmetrically distributed on both sides of the transverse plate (17). The nut seat (4) includes a support block (16), a clamping plate and a clamping bolt (12). The support block (16) is detachably connected to the milling support (8) through a bolt. The support block (16) passes through the long hole. The clamping plate and the top of the support block (16) are fixedly connected. The clamping bolt (12) passes through the clamping plate and contacts the transverse plate (17). The adjustment frame includes a base plate (14), two connecting blocks (15) and two adjusting bolts (13). The connecting blocks (15) are respectively fixedly connected to the left and right ends of the bottom of the base plate (14). The two adjusting bolts (13) respectively pass through the connecting blocks (15) and contact the side walls of the concave cavity (5).

2. A stator segment machining clamping device according to claim 1, characterized in that: A second positioning hole (6) corresponding to the first positioning hole is formed on the stator segment (3); the second positioning hole (6) and the first positioning hole are connected via a positioning pin (2).

3. The stator segment machining clamping device according to claim 1, characterized in that: The top head (10) comprises a top cover and a connecting rod. The surface of one end of the connecting rod is threaded and connected to the milling support (8). The other end is integrally connected to a spherical body. The top cover covers the spherical body and can rotate.

4. A stator segment machining clamping device according to claim 1, characterized in that: The milling support (8) is mounted on the gantry milling worktable (1) by means of bolts, and the top of the milling support (8) is in the shape of an upwardly arched arc.

5. A clamping method using the stator segment machining clamping device according to any one of claims 1 to 4, comprising the following steps: a. Install the milling support (8) on the gantry milling worktable (1); b. Hang the stator segment (3) horizontally on the milling support (8); c. Adjust the stator segment (3) by adjusting the bolt (13), the head (10) and the support bolt (11), and then insert the positioning pin (2) into the second positioning hole (6) and the first positioning hole corresponding to the stator segment (3) and the milling support (8); d. Press the pressure plate (7) and screw the pressure plate (7) and the milling support (8) with the tightening bolt (9) to clamp and fix the stator segment (3); e. Remove the positioning pin (2), and the stator segment (3) enters the processing state.

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