Positioning fixture

Abstract

The application provides a positioning tool for positioning a main cylinder and a branch cylinder which is obliquely arranged on the main cylinder. The positioning tool comprises a support base, a support surface arranged on the top of the support base, a plurality of positioning holes arranged on the support surface, the centers of the positioning holes being concentric and being distributed along the circumferential direction, a sliding table arranged on the support base and capable of moving relative to the support base, the sliding table moving along the radial direction, a positioning block corresponding to the sliding table, the positioning block being arranged on the end of the sliding table close to the positioning hole and being used for abutting against the sliding table, a mounting frame obliquely arranged on the sliding table and capable of moving together with the sliding table, and a mounting plate arranged on the mounting frame, the included angle between the mounting plate and the support surface being consistent with the included angle between the main cylinder and the branch cylinder, so that the mounting plate is used for abutting against and detachably connecting with the flange end surface of the branch cylinder. The main cylinder is positioned by the positioning holes arranged in the concentric mode, the mounting plate is precisely matched with the mounting angle of the branch cylinder in the oblique arrangement mode, and the positioning precision of the main cylinder and the branch cylinder is improved.

Description

Technical Field

[0001] This invention relates to the field of tooling equipment technology, and in particular to a positioning tooling. Background Technology

[0002] In the wind power sector, a combined load-bearing structure consisting of a main cylinder and multiple inclined support cylinders is commonly used. Currently, the assembly and positioning of the main cylinder and inclined support cylinders largely relies on manual marking or simple tooling for positioning. Because there is a fixed inclination angle between the support cylinder and the main cylinder, and the radial assembly positions of the support cylinders vary depending on the specifications of the wind turbine cylinder structure, existing positioning methods struggle to simultaneously guarantee the accuracy between the main cylinder and the support cylinders. This easily leads to problems such as deviations in the cylinder angle, reducing the assembly efficiency of the main cylinder and support cylinders, resulting in poor assembly consistency and high rework rates. Summary of the Invention

[0003] The purpose of this invention is to provide a positioning fixture to solve the problem of poor positioning accuracy in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a positioning fixture for positioning a main cylinder and a support cylinder inclinedly disposed on the main cylinder, characterized in that the positioning fixture comprises:

[0005] A support base has a support surface on its top; the support surface has multiple positioning holes, the centers of which are concentric and are spaced apart along the circumference, for positioning the flange at the end of the main cylinder. A slide table is disposed on the support base and is movable relative to the support base; the slide table moves radially along a circle enclosed by a plurality of positioning holes; A positioning block is provided corresponding to the slide table; the positioning block is located at the end of the slide table near the positioning hole and is used to abut against the slide table; The mounting bracket is inclinedly set on the slide and can move together with the slide; the mounting bracket is provided with a mounting plate, the angle between the mounting plate and the support surface is the same as the angle between the main cylinder and the support cylinder, so as to fit and detachably connect with the flange end face on the support cylinder.

[0006] In one embodiment, the support base is provided with a hollow housing, the top of the housing is provided with a radially extending groove, the slide table is slidably engaged with the groove, and the positioning block is disposed at the end of the housing facing the positioning hole.

[0007] In one embodiment, a driving mechanism is provided between the slide and the support base. The driving mechanism includes a lead screw and a nut screwed onto the lead screw. The lead screw is at least partially disposed within the housing, and the nut is connected and fixed to the slide.

[0008] In one embodiment, the support base has multiple sets of positioning holes with different diameters. Each set of positioning holes includes at least three positioning holes that are spaced apart and symmetrically arranged. The diameters of the positioning holes in each set of positioning holes are the same.

[0009] In one embodiment, the mounting plate is arc-shaped, the central angle of the mounting plate is not less than 180°, and the mounting plate is provided with a plurality of mounting holes, which are spaced apart circumferentially, and the mounting holes are used for bolting to the flange of the support cylinder.

[0010] In one embodiment, the mounting frame includes two parallel and spaced mounting beams and a plurality of connecting beams disposed between the two mounting beams. The mounting beams include an inclined portion and an extension portion. The bottom of the extension portion is horizontal. The extension portion is connected and fixed to the slide table. The included angle between the inclined portion and the supporting surface is consistent with the included angle between the main cylinder and the support cylinder. The mounting plate is disposed parallel to the inclined portion.

[0011] In one embodiment, the support base is provided with a raising platform, the cross-section of the raising platform is fan-shaped, the center of the circle formed by the raising platform and the plurality of positioning holes coincides, the positioning block and the slide are disposed on the raising platform, and the slide moves relative to the raising platform to realize movement relative to the support base.

[0012] In one embodiment, the booster platform includes a top plate and a plurality of side plates disposed at the bottom of the top plate. The side plates are fixed to the support base. The top plate is fan-shaped. The plurality of side plates are spaced apart circumferentially along the top plate, and each side plate extends radially along the top plate.

[0013] In one embodiment, the top of the positioning block extends upward beyond the bottom of the slide; The slide includes two parallel sliding plates and a connecting plate connecting the two sliding plates. The sliding plates extend outward beyond the connecting plate. The lower part of the connecting plate facing the positioning hole has a relief surface that slopes downward away from the positioning hole to avoid the positioning block.

[0014] In one embodiment, the support base includes a support frame and a plurality of legs spaced apart circumferentially along the support frame. The support frame includes a frame and a support plate disposed on the top of the frame. The upper surface of the support plate forms the support surface, and the positioning hole is formed on the support plate. The support base includes a plurality of lifting lugs disposed on the top of the support frame, and the plurality of lifting lugs are spaced apart along the circumference of the support frame.

[0015] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: The positioning fixture in this invention includes a support base, a slide, a positioning block, and a mounting bracket. The main cylinder is positioned using positioning holes arranged in a common circle. Radial adjustment of the slide, combined with the positioning block, achieves precise position control. The inclined mounting plate accurately matches the installation angle of the support cylinder, effectively reducing assembly errors and significantly improving the positioning accuracy between the main cylinder and the support cylinder. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the main cylinder and the supporting cylinder.

[0017] Figure 2 This is a schematic diagram of the positioning fixture in this invention.

[0018] Figure 3 This is a structural schematic diagram of the positioning tooling from another perspective in this invention.

[0019] Figure 4 This is a partial structural diagram of the positioning tooling in this invention.

[0020] Figure 5 yes Figure 4 A top-down view.

[0021] Figure 6 This is a partial structural diagram of the positioning tooling in this invention.

[0022] Figure 7 yes Figure 6 Front view of the middle structure excluding the shell.

[0023] Figure 8 This is a structural diagram of the main cylinder, the support cylinder, and the positioning fixture.

[0024] Figure 9 This is a structural schematic diagram of the main cylinder, the support cylinder, and the positioning fixture from another perspective.

[0025] The annotations in the attached figures are explained as follows: 11. Main cylinder; 12. Support cylinder; 5. Positioning fixture; 51. Support base; 511. Support frame; 5115. Support plate; 512. Support leg; 513. First positioning hole; 514. Second positioning hole; 515. Lifting lug; 52. Slide table; 521. Slide plate; 522. Connecting plate; 53. Positioning block; 54. Mounting bracket; 545. Inclined part; 546. Extension part; 55. Mounting plate; 56. Housing; 57. Drive mechanism; 58. Elevating platform; 581. Top plate; 582. Side plate. Detailed Implementation

[0026] Although the invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the invention and is not intended to limit the invention to what is described herein.

[0027] Therefore, a feature pointed out in this specification is used to illustrate one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. While certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0028] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of the invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0029] It should be noted that, for reference Figure 1 Offshore wind turbine composite cylindrical foundations mainly consist of a main cylinder and supporting cylinders. The main cylinder is a vertically arranged, large-diameter pressure-bearing cylinder, serving as the core load-bearing structure. It primarily bears the vertical loads, horizontal shear forces, and overturning moments transmitted by the upper tower, nacelle, and blades. The main cylinder has annular flanges at its ends, with multiple sets of circumferentially distributed bolt positioning holes for assembly of the overall structure. The supporting cylinders are inclined, tubular support members spaced circumferentially along the main cylinder. Both ends of the supporting cylinders are connected and fixed to the main cylinder and the lower foundation structure via flanges, effectively improving the overall structural rigidity and anti-overturning performance, reducing the slenderness ratio of the main cylinder, and resisting the impact of complex loads such as wind, waves, and currents at sea.

[0030] Among them, the positioning accuracy between the main cylinder and the supporting cylinder is crucial. The positional deviation between the two will affect the stress distribution, connection strength and geometry of the overall structure. If the accuracy is not up to standard, it will easily cause uneven load transfer, reduce the structural stability and service life.

[0031] Therefore, this application provides a positioning fixture for positioning the main cylinder and the support cylinder inclinedly disposed on the main cylinder, thereby improving the positioning accuracy between the two.

[0032] Combination Figure 2 and Figure 3 The positioning fixture 5 includes a support base 51, a slide table 52, a positioning block 53, and a mounting bracket 54. The support base 51 has a support surface on its top. Multiple positioning holes are provided on the support surface, with their centers concentric and spaced apart along the circumference, for positioning the flange at the end of the main cylinder 11. The slide table 52 is mounted on the support base 51 and can move relative to it. The slide table 52 moves radially along the circle formed by the multiple positioning holes. The positioning block 53 is correspondingly positioned on the slide table 52. The positioning block 53 is located at the end of the slide table 52 near the positioning hole and abuts against the slide table 52. The mounting bracket 54 is inclinedly mounted on the slide table 52 and can move with it. The mounting bracket 54 has a mounting plate 55, the angle between the mounting plate 55 and the support surface being the same as the angle between the main cylinder 11 and the support cylinder 12, for contact with and detachable connection to the flange end face on the support cylinder 12. The main cylinder 11 is positioned by means of positioning holes arranged in a circle. The radial adjustment of the slide table 52, combined with the positioning block 53, achieves precise position control. The inclined mounting plate 55 can accurately match the installation angle of the support cylinder 12, effectively reducing assembly errors and significantly improving the positioning accuracy of the main cylinder 11 and the support cylinder 12.

[0033] See Figure 4 The support base 51 includes a support frame 511 and a plurality of legs 512 spaced apart circumferentially along the support frame 511. Exemplarily, the support base 51 in this embodiment has a square cross-section. There are four legs 512, arranged at the four corners.

[0034] Specifically, the support frame 511 includes a frame and a support plate 5115 disposed on top of the frame, the upper surface of which forms a support surface. The frame includes two longitudinal beams and two transverse beams, the longitudinal beams extending longitudinally and the transverse beams extending transversely, the longitudinal beams and transverse beams connecting to form a square structure. To improve the overall structural strength, a reinforcing assembly is also provided at the bottom of the support plate 5115. The reinforcing assembly includes a transverse reinforcing transverse beam and a longitudinal reinforcing beam, the reinforcing transverse beam and the reinforcing longitudinal beam intersecting to form a cross shape, and are respectively fixed to the longitudinal beams and transverse beams of the frame.

[0035] The support base 51 includes multiple lifting lugs 515 disposed on the top of the support frame 511 to facilitate lifting the support base 51. The multiple lifting lugs 515 are spaced apart circumferentially along the support frame 511. Therefore, the force is evenly distributed during lifting and transportation, preventing tilting and swaying during the lifting process and improving operational safety and stability. In this embodiment, there are four lifting lugs 515, arranged at the four corners.

[0036] Multiple positioning holes are concentric and spaced apart along the circumference, used to position the flanges at the ends of the main cylinder 11. The positioning holes are formed on the support plate 5115. The positioning holes penetrate the upper and lower parts of the support plate 5115. The positioning holes align with the holes on the flanges and are locked in place by simultaneously inserting positioning pins.

[0037] Preferably, the support base 51 has multiple sets of positioning holes with different diameters. Each set of positioning holes includes at least three positioning holes that are spaced apart and symmetrically arranged. The diameters of the positioning holes in each set of positioning holes are the same.

[0038] By setting multiple sets of positioning holes with different apertures, this positioning fixture 5 can be compatible with flanges of different sizes of main cylinder 11, making it applicable to a wider range of scenarios. Each set of positioning holes is symmetrically distributed, ensuring reliable positioning reference and effectively preventing assembly misalignment.

[0039] For example, see Figure 5 In this embodiment, there are two sets of positioning holes, defined as the first positioning hole set and the second positioning hole set, respectively. The first positioning hole set includes three first positioning holes 513, which are symmetrically arranged about the center. The second positioning hole set includes four second positioning holes 514, which are symmetrically arranged about the transverse centerline. Specifically, in this embodiment, the first positioning holes 513 and the second positioning holes 514 are arranged at intervals along the circumference, and the spacing is not uniform. The length direction of the support base 51 is defined as longitudinal, and the width direction as transverse.

[0040] The two sets of positioning holes adopt a three-hole centrally symmetrical layout and a four-hole laterally symmetrical layout, respectively, which can be adapted to two different hole types and specifications of the main cylinder 11 flange, thus enhancing its versatility. The symmetrical hole positions ensure uniform force distribution and reliable limiting, effectively guaranteeing the flange positioning accuracy and assembly stability.

[0041] The support base 51 is provided with a hollow shell 56. The top of the shell 56 is provided with a radially extending groove. The slide table 52 slides in conjunction with the groove, so that the slide table 52 can move relative to the support base 51.

[0042] In this embodiment, the cross-section of the housing 56 is square. Specifically, the housing 56 is a cuboid structure.

[0043] The slide 52 is positioned above the housing 56 and is movable relative to the housing 56. Figure 6 and Figure 7 The slide 52 includes two parallel sliding plates 521 and a connecting plate 522 connecting the two sliding plates 521. The sliding plates 521 extend outward beyond the connecting plate 522. The surfaces of the sliding plates 521 are horizontal, and the surfaces of the connecting plate 522 are vertical.

[0044] The lower part of the end of the connecting plate 522 facing the positioning hole is preferably provided with a relief surface that slopes from top to bottom away from the positioning hole to avoid the positioning block 53.

[0045] A drive mechanism 57 is provided between the slide table 52 and the support base 51 to drive the slide table 52 to move. Specifically, the drive mechanism 57 includes a lead screw and a nut screwed onto the lead screw. The lead screw is at least partially disposed within the housing 56, and the nut is connected and fixed to the slide table 52. The lead screw portion is housed within the housing 56, which can protect the transmission structure.

[0046] When the slide 52 is moved, the lead screw is rotated, and the rotational motion of the lead screw is converted into the linear motion of the nut through the threaded transmission between the lead screw and the nut. Since the nut is fixedly connected to the slide 52, it drives the slide 52 to make linear displacement along the support base 51, thereby completing the adjustment of the position of the slide 52. This transmission method is convenient to operate and provides precise displacement control, which can meet the fine-tuning needs of different installation positions of the support cylinder 12. The self-locking function can stabilize the posture of the slide 52 and avoid positional movement during assembly operations, and the protective design of the housing 56 is also suitable for complex on-site working conditions.

[0047] The drive mechanism 57 also includes a handwheel disposed outside the housing 56 and connected to the lead screw, so as to facilitate the rotation of the lead screw.

[0048] Preferably, the support base 51 is provided with a raising platform 58 to raise the overall height of the mounting bracket 54 so that its height matches the flange of the support cylinder 12. The cross-section of the raising platform 58 is fan-shaped, and the center of the circle formed by the raising platform 58 and the multiple positioning holes coincides. The positioning block 53 and the slide 52 are both mounted on the surface of the raising platform 58. The slide 52 moves relative to the raising platform 58, thereby realizing the position adjustment relative to the support base 51. Specifically, in this embodiment, the housing 56 is disposed on the raising platform 58, and the slide 52 is disposed above the housing 56.

[0049] Specifically, the riser platform 58 includes a top plate 581 and multiple side plates 582 disposed at the bottom of the top plate 581. The side plates 582 are fixed to the support base 51. The top plate 581 is fan-shaped, and the multiple side plates 582 are spaced apart circumferentially along the top plate 581, with each side plate 582 extending radially along the top plate 581. The multiple side plates 582 evenly distribute the load, preventing warping or settlement of the top plate 581, ensuring that the motion reference of the slide table 52 remains unchanged, and thus ensuring the positioning accuracy of the main cylinder 11 and the support cylinder 12.

[0050] The housing 56 is screwed to the riser platform 58. Specifically, the top plate 581 has multiple sets of mounting holes, each set including multiple mounting holes spaced radially apart. Adaptively, the bottom of the housing 56 has through holes that match the mounting holes.

[0051] Mounting bracket 54 includes two parallel and spaced-apart mounting beams and multiple connecting beams disposed between the two mounting beams. Each mounting beam includes an inclined portion 545 and an extension portion 546. The bottom of the extension portion 546 is horizontal. The extension portion 546 is connected and fixed to the slide table 52. The angle between the inclined portion 545 and the supporting surface is the same as the angle between the main cylinder 11 and the support cylinder 12. Specifically, the extension portion 546 is connected and fixed to the slide plate 521 on the top of the slide table 52.

[0052] Mounting plate 55 is positioned at the inclined portion 545 away from the extension portion 546. Specifically, mounting plate 55 is arc-shaped, with a central angle of not less than 180°. Mounting plate 55 has multiple mounting holes spaced circumferentially for bolting to the flange of support cylinder 12. The arc-shaped surface of mounting plate 55 adapts to the flange shape, providing a large contact area and distributing assembly loads. The circumferential distribution of multiple mounting holes ensures balanced tightening force.

[0053] The mounting plate 55 is set parallel to the inclined part 545 to ensure that the installation posture is consistent with the design requirements, avoid angular deviation from the structure, and ensure assembly quality.

[0054] A reinforcing rib is also provided between the mounting plate 55 and the mounting bracket 54. The reinforcing rib is located on the outside of the mounting beam.

[0055] The positioning block 53 is located at the end of the housing 56 facing the positioning hole. The positioning block 53 is used to restrict the movement of the slide table 52 to ensure that the slide table 52 stops at the preset position, and to ensure that the relative position and assembly angle of the support cylinder 12 and the main cylinder 11 meet the design requirements, thereby effectively improving the overall positioning accuracy and assembly consistency.

[0056] The top of the positioning block 53 extends upward beyond the bottom of the slide table 52, therefore, the slide table 52 is provided with a clearance surface to avoid the positioning block 53.

[0057] In this embodiment, there are two slides 52, mounting brackets 54, mounting plates 55 and positioning blocks 53, which can simultaneously position one main cylinder 11 and two branch cylinders 12.

[0058] Specifically, the structure on the raising platform 58 is equipped with two sets, which are adapted to the two cylinders 12.

[0059] The positioning fixture 5 positions the main cylinder 11 and the support cylinder 12 as follows: S1. Hoist the main cylinder 11 onto the support surface and position the main cylinder 11.

[0060] Specifically, during hoisting, the flange at the end of the main cylinder 11 is aligned with the support surface of the support base 51. Then, the positioning holes on the support plate 5115 are aligned with the holes on the flange, and a positioning pin is inserted to lock the support plate 5115 and the flange on the main cylinder 11, thereby achieving circumferential and radial positioning of the flange of the main cylinder 11.

[0061] S2. Transport the support cylinder 12 and connect the support cylinder 12 to the mounting plate 55.

[0062] Specifically, the flange of the support cylinder 12 is attached to the mounting plate 55, and the two are locked and fixed by bolts passing through the mounting holes on the mounting plate 55 and the holes on the flange of the support cylinder 12.

[0063] S3. Drive the slide 52 to move until the slide 52 abuts against the positioning block 53.

[0064] Specifically, rotating the handwheel drives the lead screw, causing the slide table 52 to move radially towards the main cylinder 11, simultaneously moving the mounting plate 55 and the flange of the support cylinder 12 in the same direction. After the slide table 52 abuts against the positioning block 53, the flange of the support cylinder 12 reaches the preset precise assembly position.

[0065] Positioning fixture 5 completes the positioning of the main cylinder 11 and the support cylinder 12 as follows: Figure 8 and Figure 9 As shown.

[0066] S4. Position welding the connection between the support cylinder 12 and the main cylinder 11.

[0067] After welding is completed, remove the bolts connecting the flange of the support cylinder 12 and the mounting plate 55, turn the handwheel in the opposite direction to drive the slide table 52 to reset and move backward, so that the flange of the support cylinder 12 is removed from the assembly station, and the single assembly operation is completed.

[0068] In summary, this positioning fixture has the following advantages and positive effects: This positioning fixture uses a common circular positioning hole as the positioning reference for the main cylinder, employs a lead screw and nut mechanism to achieve precise slide table feeding, and uses positioning blocks for mechanical limiting, resulting in small positioning errors and good consistency. The inclined arc-shaped mounting plate precisely matches the installation posture of the support cylinder, ensuring that the included angle between the two meets the design requirements. The entire fixture has a unified reference and high structural strength, can maintain positioning accuracy over a long period of time, simplifies on-site assembly and adjustment work, and significantly improves the accuracy between the main cylinder and the support cylinder.

[0069] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A positioning fixture for positioning a main cylinder and a support cylinder inclinedly disposed on the main cylinder, characterized in that, The positioning fixture includes: A support base has a support surface on its top; the support surface has multiple positioning holes, the centers of which are concentric and are spaced apart along the circumference, for positioning the flange at the end of the main cylinder. A slide table is disposed on the support base and is movable relative to the support base; the slide table moves radially along a circle enclosed by a plurality of positioning holes; A positioning block is provided corresponding to the slide table; the positioning block is located at the end of the slide table near the positioning hole and is used to abut against the slide table. The mounting bracket is inclinedly set on the slide and can move together with the slide; the mounting bracket is provided with a mounting plate, the angle between the mounting plate and the support surface is the same as the angle between the main cylinder and the support cylinder, so as to fit and detachably connect with the flange end face on the support cylinder.

2. The positioning fixture according to claim 1, characterized in that, The support base is provided with a hollow shell, and a radially extending groove is opened on the top of the shell. The slide table slides in conjunction with the groove, and the positioning block is disposed at the end of the shell facing the positioning hole.

3. The positioning fixture according to claim 2, characterized in that, A driving mechanism is provided between the slide and the support base. The driving mechanism includes a lead screw and a nut screwed onto the lead screw. The lead screw is at least partially disposed inside the housing, and the nut is connected and fixed to the slide.

4. The positioning fixture according to claim 1, characterized in that, The support base has multiple sets of positioning holes with different diameters. Each set of positioning holes includes at least three positioning holes that are spaced apart and symmetrically arranged. The diameter of the positioning holes in each set of positioning holes is the same.

5. The positioning fixture according to claim 1, characterized in that, The mounting plate is arc-shaped, with a central angle of not less than 180°. The mounting plate is provided with multiple mounting holes, which are spaced apart circumferentially. The mounting holes are used for bolting to the flange of the support cylinder.

6. The positioning fixture according to claim 1, characterized in that, The mounting frame includes two parallel and spaced mounting beams and multiple connecting beams between the two mounting beams. Each mounting beam includes an inclined portion and an extension portion. The bottom of the extension portion is horizontal. The extension portion is connected and fixed to the slide table. The angle between the inclined portion and the support surface is the same as the angle between the main cylinder and the support cylinder. The mounting plate is arranged parallel to the inclined portion.

7. The positioning fixture according to claim 1, characterized in that, The support base is provided with a raising platform. The cross-section of the raising platform is fan-shaped. The center of the circle formed by the raising platform and the plurality of positioning holes coincides with the center of the circle. The positioning block and the slide are disposed on the raising platform. The slide moves relative to the raising platform to realize movement relative to the support base.

8. The positioning fixture according to claim 7, characterized in that, The raised platform includes a top plate and multiple side plates disposed at the bottom of the top plate. The side plates are fixed to the support base. The top plate is fan-shaped. The multiple side plates are spaced apart circumferentially along the top plate, and each side plate extends radially along the top plate.

9. The positioning fixture according to claim 1, characterized in that, The top of the positioning block extends upward beyond the bottom of the slide table; The slide includes two parallel sliding plates and a connecting plate connecting the two sliding plates. The sliding plates extend outward beyond the connecting plate. The lower part of the connecting plate facing the positioning hole has a relief surface that slopes downward away from the positioning hole to avoid the positioning block.

10. The positioning fixture according to claim 1, characterized in that, The support base includes a support frame and a plurality of legs spaced apart circumferentially along the support frame. The support frame includes a frame and a support plate disposed on the top of the frame. The upper surface of the support plate forms the support surface, and the positioning hole is formed on the support plate. The support base includes a plurality of lifting lugs disposed on the top of the support frame, and the plurality of lifting lugs are spaced apart along the circumference of the support frame.

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