Cantilever milling machine and method for processing anchoring plane of suspension bridge by using same

Abstract

The application discloses a cantilever milling machine and a method for processing the anchoring plane of a suspension bridge by using the same. The cantilever milling machine comprises a milling machine body composed of a base, a column, a cross beam, a ram and a milling head. In the structure of the milling machine body, the base is of an elongated structure, the bottom of the column is assembled on the base in a linear transverse movement structure, the ram is assembled on one side of the column in a linear vertical movement structure, the cross beam is assembled on the ram in a linear transverse movement structure, and the milling head is fixed at one end of the cross beam with a milling cutter downward. A plurality of groups of magnetic force fixing components are connected to the bottom of the base on both sides of the length direction of the base in a spaced arrangement structure along the length direction. Each group of the magnetic force fixing components is connected to the bottom of the base in a detachable structure, the connection height of each group of the magnetic force fixing components on the bottom of the base is adjustable, and the base is fixed on a work platform by the magnetic force of each group of the magnetic force fixing components. The application makes the use and application environment of the cantilever milling machine more flexible, and realizes the lossless fixing without drilling and welding on the work platform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining, in particular to a small and portable cantilever milling machine and a processing method for milling the anchoring plane-grid of a suspension bridge by using the milling machine. BACKGROUND

[0002] The milling machine is a machine tool device for high-precision milling of workpieces by using a milling cutter, which can obtain a high-precision milling plane on the workpiece. Common milling machines are gantry milling machines with large structures and heavy weights, which can only be used in fixed machine shops and are not suitable for flexible moving to the construction site for use.

[0003] In the construction, especially in the construction of suspension bridges, the milling machining for repairing the plane of the workpiece anchored in the foundation structure is often involved, which is most obvious in the grid top surface repair operation of the suspension bridge construction.

[0004] In the suspension bridge structure, the cable saddle on the tower body bears various huge dynamic and static loads transmitted by the main cable, and the cable saddle is the core load-bearing component in the suspension bridge structure. The shaped structure of the cable saddle on the tower body is mainly composed of a saddle body, an upper bearing plate, a frictional motion pair, a lower bearing plate, a grid and the like from top to bottom, the saddle body is fixedly connected with the upper bearing plate, the lower bearing plate is fixed on the top surface of the grid, the frictional motion pair is between the upper bearing plate and the lower bearing plate, and the grid is cast on the top of the tower body at the construction site. The top surface of the grid serves as the mounting surface of the lower bearing plate, and the flatness design requirement thereof is within 0.5 mm.

[0005] When leaving the factory, the flatness of the processed grid top surface meets the design technical requirement. During the installation at the site, due to the extrusion force of the hardened concrete on the grid component, the grid is prone to deformation, which causes the flatness of the top surface to be poor and exceed the design technical requirement (i.e. ≥0.5 mm), and this phenomenon is most obvious in the large-size grid anchored by the large-span suspension bridge. The deformation of the flatness of the top surface of the anchored grid will inevitably affect the installation accuracy of the lower bearing plate, and the exceeding of the design technical requirement is not allowed in the construction.

[0006] Currently, for the anchoring deformation of small-size grating, it is usually controlled by the shoring pad leveling before anchoring. Although this method is beneficial to the deformation control of the flatness of the grating top surface, the technical effect is relatively limited, and the flatness deformation of the grating top surface always exists, which is within the controllable range and does not affect the installation accuracy of the lower bearing plate on the grating top surface. However, for large-size grating, due to the large structure and force surface, the grouting deformation is also greatly increased. Therefore, it is difficult to control the anchoring deformation of the grating by relying on the shoring pad leveling before anchoring, which also significantly increases the technical difficulty of shoring pad leveling control. For the anchoring deformation of large-size grating, there is currently no effective technical means. If the traditional manual polishing or manual scraping is used to handle it, not only the operation efficiency is low and the labor intensity of workers is large, but also the quality is difficult to control, and it is difficult to achieve the design technical requirements of flatness and accuracy. The most feasible way is to use a milling machine that can achieve high-precision planar milling to repair the grating top surface at the anchoring site. However, in common milling machines, there is no portable planar milling equipment that can be used for repairing the grating top surface.

[0007] The cantilever type milling machine is a type of milling machine, which has the technical characteristics of small structure, light weight and easy to carry compared with the gantry type milling machine, such as the technology disclosed in the Chinese patent document entitled "Single-column beam moving type numerical control boring and milling machine" (publication number CN 201744851 U, publication date February 16, 2011) and the like. However, the base of such cantilever type milling machine needs to be drilled and fixed on the operation platform (installation foundation); however, the grating top surface anchored on site of the suspension bridge is not allowed to be mechanically processed beyond the design requirements, including drilling anchor bolt holes and welding anchor joints, due to the design technical requirements. Therefore, the existing cantilever type milling machine cannot be used for repairing the flatness of the grating top surface anchored on site of the suspension bridge.

[0008] In addition, the applicant has previously disclosed a machine tool that can be fixed on the operation platform without drilling and welding, which is detailed in the Chinese patent document entitled "A detachable and portable special equipment for planar processing" (publication number CN216370328 U, publication date April 26, 2022). In this technology, a fixed component connected with wheels and magnets is connected below the base, which is fixed on the operation platform by the magnets and moves and rotates by the wheels. However, due to the operation characteristics of the machine tool and its own gravity, the wheels are not suitable to be formed as universal wheels with adjustable direction, which makes the stability of the machine tool on the operation platform poor and has safety hazards. If directional wheels are selected, the machine tool can be kept stable on the operation platform, but the directional wheels can only adjust the translation position of the machine tool on the operation platform, and the rotation displacement adjustment is difficult to achieve, which usually needs to be completed by lifting, which is very inconvenient to operate.

[0009] In view of the technical requirement of high-precision planar milling processing for the good grid top surface flatness of the suspension bridge field anchoring, it is necessary to develop a cantilever milling machine with small structure volume, light weight, easy to carry, non-drilling lossless fixing, and flexible and convenient displacement adjustment. SUMMARY

[0010] The technical purpose of the present application is to provide a cantilever milling machine with small structure volume, light weight, easy to carry, non-drilling lossless fixing, and flexible and convenient displacement adjustment, and a method for processing the suspension bridge anchoring plane using the cantilever milling machine.

[0011] The technical purpose of the present application is achieved by the following technical scheme, a cantilever milling machine, comprising a milling machine body composed of a base, a column, a cross beam, a ram and a milling head;

[0012] In the milling machine body structure, the base is an elongated structure, the bottom of the column is assembled on the base in a linear transverse movement structure, the ram is assembled on one side of the column in a linear vertical movement structure, the cross beam is assembled on the ram in a linear transverse movement structure, and the milling head is fixed at one end of the cross beam with the milling cutter facing down.

[0013] A plurality of groups of magnetic fixing components are connected to the bottom of the base on both sides of the length direction of the base in a spaced arrangement structure along the length direction; the base is fixed on the work platform by the attraction of each group of magnetic fixing components;

[0014] Each group of magnetic fixing components is connected to the bottom of the base in a detachable structure, and the connection height of each group of magnetic fixing components on the bottom of the base is adjustable through the wedge and the tensioning screw.

[0015] A rotary bearing is connected to the center of the base, the base is fixedly connected with the outer ring / inner ring of the rotary bearing, and the inner ring bottom end / outer ring bottom end of the rotary bearing protrudes from the bottom surface of the base.

[0016] When the workpiece is milled, the base is supported and fixed on the work platform by each group of magnetic fixing components, and the bottom end of the rotary bearing is separated from the work platform.

[0017] When the work platform is rotated and adjusted, the support and fixation of the base by each group of magnetic fixing components is released, the inner ring bottom end / outer ring bottom end of the rotary bearing is seated on the work platform, and the base can rotate on the work platform with the inner ring / outer ring of the rotary bearing as the center.

[0018] The technical measures are based on a cantilever milling machine with small structure volume, light weight and easy portability. A plurality of detachable magnetic fixing assemblies are connected at the bottom of the base, and a rotary bearing is connected at the center of the base. The magnetic fixing assemblies fix the cantilever milling machine on a work platform made of metal without drilling or welding, thereby realizing non-destructive fixing without drilling or welding. The base contacts the work platform through the rotary bearing, so that the cantilever milling machine can rotate at any angle in the circumferential direction on the work platform, and the complex and cumbersome lifting rotation is avoided. In this way, the fixed position of the cantilever milling machine on the work platform and the position adjustment are flexible and convenient, which greatly improves the flexibility of the cantilever milling machine in different work positions of the same workpiece, makes the cantilever milling machine portable and applicable to the technical requirements of temporary milling at the construction site, and effectively meets the technical requirements of planar milling equipment at the construction site, especially the anchoring construction site of the suspension bridge.

[0019] In the above technical measures, the magnetic fixing assembly cooperates with the rotary bearing. The magnetic fixing assembly supports the cantilever milling machine, and the rotary bearing adjusts the rotation position of the cantilever milling machine. The magnetic fixing assembly supports the cantilever milling machine, and the rotary bearing adjusts the rotation position of the cantilever milling machine. They effectively compatible with each other and have low interference, and do not affect the normal milling processing of the cantilever milling machine on the work platform.

[0020] As one of the preferred schemes, the bottom of the base is used as a set position for connecting the corresponding magnetic fixing assembly, and a positioning groove with a connected corresponding edge is formed in the upwardly recessed structure;

[0021] A waist-shaped pull rod hole is formed in the base at the top of the positioning groove, and the waist-shaped direction of the pull rod hole is formed along the length direction of the base;

[0022] The magnetic fixing assembly mainly consists of a magnetic chuck, a wedge block and a tensioning screw. The tensioning screw is fixed on the top side of the magnetic chuck and extends upward. The wedge block is arranged on the top side of the magnetic chuck.

[0023] The magnetic chuck is connected with the tensioning screw on the top side and is worn in the corresponding pull rod hole in the base. The magnetic chuck and the wedge block are accommodated in the corresponding positioning groove. The extension segment of the tensioning screw on the top side of the base is connected with a locking nut. The height of the magnetic chuck in the positioning groove relative to the downward protrusion of the bottom side of the base is adjusted by the wedge block.

[0024] The technical measures make the connection position of the magnetic fixing assembly at the bottom of the base more stable, and the support height adjustment of the base is more reliable, especially when cooperating with the rotary bearing, it is easy to disassemble from the bottom of the base to reduce the adverse effect on the support stability of the cantilever milling machine, that is, the cooperation structure between the magnetic fixing assembly and the base can ensure the smooth falling of the base on the operation platform when the base falls back, prevent tilting and have good stability effect.

[0025] Further, the wedge block of the magnetic fixing assembly is composed of a lower wedge block, an upper wedge block and a height adjustment screw;

[0026] The lower wedge block is fixedly connected to the top side of the magnetic chuck one, and the lower wedge block is threadedly connected to the bottom end of the tensioning screw one, the outer edge of the lower wedge block has an upwardly protruding positioning boss, and the positioning boss is provided with a screw waist type hole two communicating the inner and outer sides, and the waist type direction of the screw waist type hole two is formed along the height direction of the positioning boss;

[0027] The upper wedge block is provided with a screw waist type hole one sleeving the tensioning screw one, the upper wedge block is sleeved on the outer periphery of the tensioning screw one through the screw waist type hole one and is located on the top side of the lower wedge block, and the upper wedge block cooperates with the lower wedge block in a bevel structure, and the waist type direction of the screw waist type hole one is directed to the direction of the positioning boss on the lower wedge block;

[0028] The height adjustment screw transversely passes through the screw waist type hole two on the lower wedge block and is threadedly connected with the upper wedge block, and the rotation of the height adjustment screw in the screw waist type hole two causes the sliding of the upper wedge block on the bevel of the lower wedge block.

[0029] The technical measures are aimed at the magnetic chuck of the magnetic fixing assembly, and the adjustable wedge block around the tensioning screw is formed through the assembly structure between the tensioning screw and the base, which has good assembly stability between the magnetic chuck and the base and does not have the risk of displacement and disengagement, reliably supports the base, and can realize accurate lifting / descending adjustment through the height adjustment screw, meeting the technical requirements of high-precision machining of the cantilever milling machine.

[0030] As one of the preferred schemes, the two ends of each side of the base length direction are respectively formed with a pad block groove communicating with the corresponding edge in an upwardly recessed structure, and the pad block groove is located outside the positioning groove on the side;

[0031] When the base is leveled on the operation platform, the wedge-shaped structure height adjustment wedge block assembly between the base and the operation platform is embedded in the corresponding pad block groove.

[0032] The technical measures can smoothly level the base on the work platform to meet the technical requirement of high-precision processing of the cantilever milling machine.

[0033] Further, each side of the base in the length direction is provided with a plurality of screw holes arranged at intervals along the length direction; the screw holes on the same side are arranged at intervals outside and inside the positioning groove on the side.

[0034] When the base is leveled on the work platform, a fine adjustment screw is threadedly arranged in the corresponding screw hole, and the bottom end of the fine adjustment screw serves as an abutment against the work platform during the screwing up / down process.

[0035] The technical measures, on the one hand, cooperate with the height adjustment pad assembly to accurately level the support height of the base on the work platform; on the other hand, the technical measures are directed to the elongated structure of the base and the support rigidity of the base after lightening, form multi-point stable support to prevent the deflection of the base after being stressed, and ensure the support accuracy and stability of the base on the work platform.

[0036] As one of the preferred solutions, the milling machine further comprises a plurality of sets of hydraulic displacement mechanisms which cooperate with the base in a detachable manner.

[0037] Each set of hydraulic displacement mechanisms mainly consists of a hydraulic jack, a roller and a hydraulic pump, the bottom end of the hydraulic jack is connected with the roller, and the hydraulic pump serves to pressurize / depressurize the hydraulic jack.

[0038] When translating on the work platform, the support and fixation of the base are released, the hydraulic jacks of each set of hydraulic displacement mechanisms are distributed between the work platform and the base, the rollers at the bottom of the hydraulic jacks are seated on the work platform, the top of the hydraulic jacks lifts the base so that the bottom surface of the base is separated from the work platform, and the rotation direction of the rollers of each set of hydraulic displacement mechanisms follows the translation direction.

[0039] The technical measures do not affect the rotatability and support stability of the base, and timely add traveling wheels to the cantilever milling machine through detachable hydraulic displacement mechanisms, so as to facilitate flexible walking and translation of the cantilever milling machine on the work platform, and further enhance the portability.

[0040] Further, when the hydraulic jack of the hydraulic displacement mechanism lifts the base, the hydraulic jack is embedded in the corresponding positioning groove at the bottom of the base. The technical measures facilitate flexible and easy assembly / disassembly of the hydraulic displacement mechanism at the bottom of the base, and do not affect the support stability of the base on the work platform.

[0041] A method for processing the anchoring plane of a suspension bridge by using the cantilever milling machine as described above, the anchoring plane of the suspension bridge being the grid top surface for anchoring and saddle installation at the construction site of the suspension bridge, the method for milling the anchoring grid top surface comprises the following process steps:

[0042] Step 1. The cantilever milling machine is hoisted to the preset reference position of the anchored grid top surface, and the grid top surface is used as the working platform of the cantilever milling machine;

[0043] The base of the cantilever milling machine is leveled on the grid top surface by adjusting the wedge block assembly and the fine adjustment screw, so that the bottom end of the slewing bearing on the base is lifted off the grid top surface;

[0044] The base of the cantilever milling machine is magnetically fixed on the grid top surface by the magnetic fixing assembly;

[0045] Step 2. Start the cantilever milling machine and mill the current milling area set on the grid top surface;

[0046] Step 3. After completing the milling of the current milling area in step 2, the magnetic fixing assembly, the wedge block assembly and the fine adjustment screw are removed, and the base is lowered on the grid top surface, so that the bottom end of the inner / outer ring of the slewing bearing is seated on the grid top surface;

[0047] Step 4. The base is rotated on the grid top surface at the selected next milling area with the inner / outer ring of the slewing bearing as the center;

[0048] After rotation, the base of the cantilever milling machine is lifted and translated on the grid top surface by the hydraulic displacement mechanism to the new preset reference position;

[0049] Step 5. Remove the hydraulic displacement mechanism in step 4;

[0050] Repeat step 1 to level and fix the base of the cantilever milling machine on the grid top surface;

[0051] Repeat step 2 to mill the current milling area set on the grid top surface;

[0052] Repeat steps 3 to 5 until all the milling areas on the grid top surface are processed, and then remove the cantilever milling machine from the grid top surface.

[0053] As one of the preferred solutions, the current milling area in steps 2 and 5 is measured by the highest point of the detected plane data;

[0054] The processing allowance, feed amount and movement trajectory of the cantilever milling machine are set according to the measured height difference.

[0055] As one of the preferred solutions, in step 1, when the base of the cantilever milling machine is fixed on the top surface of the grid, a back pressing plate assembly is additionally arranged to press and fix the top side of the base from the back;

[0056] The back pressing plate assembly mainly comprises a magnetic chuck II, a supporting pad, a pressing plate and a tensioning screw II;

[0057] The tensioning screw II is fixed on the top side of the magnetic chuck II and extends upward;

[0058] The supporting pad is arranged on the top side of the magnetic chuck II and is located on the outer side of the tensioning screw II;

[0059] The pressing plate is provided with a waist-shaped screw hole along the length direction, one end of the pressing plate is located on the top side of the supporting pad, the other end is located on the top side of the base, and the tensioning screw II passes through the screw hole of the pressing plate and is locked by a locking nut II.

[0060] The above technical measures are aimed at the particularity of the deformation of the grid anchoring in the construction site of the suspension bridge. The above light and portable cantilever milling machine is used to repair the flatness of the top surface of the grid in the construction site, so as to reliably improve the flatness of the anchored grid top surface, eliminate the adverse effects of the force on the flatness of the grid top surface during the anchoring process, and ensure that the anchored grid top surface has high-precision flatness and meets the technical requirements of the cable saddle installation. Compared with the traditional manual flatness repair method, the method has high efficiency, low labor intensity, high precision, and will not damage the anchored grid, and has good reliability.

[0061] The above technical measures can reliably reduce the anchoring technical difficulty of the large-size grid anchored by the large-span suspension bridge, and also help to reliably reduce the installation technical difficulty of the cable saddle on the top of the grid and improve the installation precision.

[0062] The beneficial technical effects of the present application are: the above technical measures are based on the small structure, light weight and portable cantilever milling machine, which realizes the non-destructive fixing of the cantilever milling machine on the working platform without drilling and welding, and also realizes the light, flexible and efficient displacement adjustment of the cantilever milling machine on the working platform, greatly improves the flexibility of the cantilever milling machine in different working positions of the same workpiece, makes the cantilever milling machine portable and portable, reliably meets the technical requirements of the construction site, especially the suspension bridge anchoring construction site, and effectively meets the technical requirements of the construction site, especially the suspension bridge anchoring construction site.

[0063] The technical measures can reliably improve the flatness of the anchored grating top surface, eliminate the adverse effects of the force on the flatness of the grating top surface during the anchoring process, and reliably reduce the anchoring technical difficulty of the large-size grating anchored by the large-span suspension bridge. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 It is a structural schematic diagram of the cantilever milling machine.

[0065] Figure 2 It is a structural schematic diagram of the cantilever milling machine. Figure 1 It is a structural schematic diagram of the cantilever milling machine.

[0066] Figure 3 It is a structural schematic diagram of the cantilever milling machine. Figure 1 It is a structural schematic diagram of the cantilever milling machine. Figure 2 It is a structural schematic diagram of the cantilever milling machine.

[0067] Figure 4 It is a structural schematic diagram of the cantilever milling machine. Figure 2 It is a structural schematic diagram of the cantilever milling machine.

[0068] Figure 5 It is another structural schematic diagram of the cantilever milling machine.

[0069] Figure 6 It is a schematic diagram of the planar milling of the grating of the suspension bridge by the cantilever milling machine.

[0070] Code meaning in the figure: 1 - base; 11 - horizontal linear displacement guide rail one; 12 - horizontal ball screw one; 13 - rotary bearing; 131 - outer ring; 132 - inner ring; 14 - positioning groove; 15 - lifting cavity; 16 - pad groove; 17 - screw hole; 18 - fine adjustment screw; 19 - pull rod hole; 2 - column; 21 - vertical linear guide rail; 22 - vertical ball screw; 3 - cross beam; 31 - horizontal linear guide rail two; 32 - horizontal ball screw two; 4 - ram; 5 - milling head; 51 - gearbox; 52 - main shaft; 53 - milling cutter; 6 - magnetic fixing assembly; 61 - magnetic chuck one; 62 - lower wedge; 621 - screw waist type hole two; 63 - upper wedge; 631 - screw waist type hole one; 64 - height adjustment pull rod; 65 - tension screw one; 66 - locking nut one; 7 - height adjustment wedge assembly; 8 - back pressing plate assembly; 81 - magnetic chuck two; 82 - connecting steel plate; 83 - supporting pad; 84 - pressing plate; 85 - tension screw two; 86 - locking nut two; 9 - hydraulic displacement mechanism; 91 - roller; 92 - hydraulic jack; 93 - hydraulic pump; 10 - grating. DETAILED DESCRIPTION

[0071] The present application relates to the technical field of machining, in particular to a small and portable cantilever milling machine and a method for milling the anchoring plane-grid of a suspension bridge using the milling machine. The main technical solution of the present application will be described in detail in the following embodiments. The embodiment 1 is illustrated in the attached drawings of the specification, i.e. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The technical solution of the cantilever milling machine of the present application is clearly and specifically explained. The embodiment 7 is illustrated in the attached drawings of the specification, i.e. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The technical solution of the method for milling the top surface of the anchoring plane-grid of a suspension bridge using the cantilever milling machine of the present application is clearly and specifically explained. The main structure of other embodiments can be referred to the drawings of the embodiment 1 or the embodiment 7.

[0072] It should be noted that the drawings of the present application are schematic and some unnecessary details are simplified to avoid obscuring the technical solution of the present application which contributes to the prior art.

[0073] Embodiment 1

[0074] As shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The cantilever milling machine of the present application comprises a milling machine body composed of a base 1, a column 2, a beam 3, a ram 4 and a milling head 5.

[0075] Specifically, the base 1 is an elongated structure with a width dimension much smaller than a length dimension. At the top of both sides of the length direction of the base 1, a horizontal linear guide rail one 11 is fixed respectively, and between the two horizontal linear guide rails one 11, the base 1 is arranged with a rotatable horizontal ball screw one 12, one end of the horizontal ball screw one 12 is connected with a servo motor, and the two horizontal linear guide rails one 11 and the horizontal ball screw one 12 in the middle are arranged in parallel. At the bottom center of the base 1, a rotary bearing 13 is connected, the base 1 and the outer ring 131 of the rotary bearing 13 form fixed connection, the inner ring 132 of the rotary bearing 13 can rotate freely relative to the outer ring 131 and the base 1, the inner ring 132 of the rotary bearing 13 protrudes downward from the bottom surface of the base 1, when the base 1 needs to be seated on the work platform, it is seated through the inner ring 132 of the rotary bearing 13. At the bottom of both sides of the length direction of the base 1, two positioning grooves 14, four lifting cavities 15 and two pad grooves 16 are arranged in a spaced structure along the length direction. The two positioning grooves 14 on the same side are arranged in a substantially symmetrical structure on the left and right sides of the rotary bearing 13 with the rotary bearing 13 as the distance center, each positioning groove 14 is formed in an upwardly recessed structure and communicates with the edge on the same side, that is, an upwardly recessed structure is formed at the edge; A pull rod hole 19 of a waist type structure is provided on the base 1 at the top of the positioning groove 14, and the waist type direction of the pull rod hole 19 is formed along the length direction of the base 1. The two pad grooves 16 on the same side are arranged in a substantially symmetrical structure near the two ends of the base 1, that is, the pad groove 16 at each end is arranged on the outer side of the positioning groove 14. Two of the four lifting cavities 15 on the same side are distributed between the adjacent pad groove 16 and positioning groove 14, and the other two are distributed between the two positioning grooves 14, and the lifting cavity 15 between the two positioning grooves 14 is substantially arranged on the outer side of the rotary bearing 13; Each lifting cavity 15 is formed in a recessed structure on the side on the same side, and a screw hole 17 is provided on the base 1 at the bottom side of the lifting cavity 15. The positioning grooves 14, the lifting cavities 15 and the pad grooves 16 on both sides of the length direction of the base 1 are substantially symmetrical structures along the width direction.

[0076] The bottom of the column 2 is assembled on the two horizontal linear guides 11 on the top of the base 1 in a sliding structure, and is screwed with the horizontal ball screw 12 on the base 1. In the rotating movement of the horizontal ball screw 12, the column 2 moves linearly along the horizontal linear guides 11 on the base 1. The column 2 is fixed with vertical linear guides 21 on both sides along the height direction on the side surface of the base 1 in width direction, and the rotatable vertical ball screw 22 is arranged between the two vertical linear guides 21 on the column 2, the upper end of the vertical ball screw 22 is connected with a servo motor, and the two vertical linear guides 21 and the vertical ball screw 22 in the middle are arranged in parallel. The side of the column 2 opposite to the vertical linear guides 21 and the vertical ball screw 22 is used for connecting the control system part, including the frequency conversion motor controller, the servo motor controller and the like.

[0077] The side of the ram 4 is assembled on the two vertical linear guides 21 on the side of the column 2 in a sliding structure, and is screwed with the vertical ball screw 22 on the column 2. In the rotating movement of the vertical ball screw 22, the ram 4 moves linearly along the vertical linear guides 21 on the column 2.

[0078] The side surface of the beam 3 is fixed with horizontal linear guides 31 on both sides in length direction, and the rotatable horizontal ball screw 32 is arranged between the two horizontal linear guides 31 on the beam 3, one end of the horizontal ball screw 32 is connected with a servo motor, and the two horizontal linear guides 31 and the horizontal ball screw 32 in the middle are arranged in parallel. The horizontal ball screw 32 of the beam 3 is screwed with the side surface of the ram 4 opposite to the column 2, and in the rotating movement of the horizontal ball screw 32, the beam 3 moves linearly along the horizontal linear guides 31 on the ram 4.

[0079] The milling head 5 is mainly composed of a gearbox 51, a main shaft 52 and a milling cutter 53. The gearbox 51 is fixed on one end of the beam 3 away from the servo motor connected with the beam 3. The input end of the gearbox 51 is connected with the frequency conversion motor. The main shaft 52 is connected with the output end of the gearbox 51 and extends downward. The milling cutter 53 is connected with the bottom end of the main shaft 52, and the milling cutter 53 faces downward.

[0080] The above-mentioned base 1, column 2, beam 3, ram 4 and milling head 5 constitute a cantilever type milling machine main structure, the position adjustment along the Cartesian coordinate system X, Y and Z axes is realized by the action of the corresponding servo motor controlled by the servo motor controller; and the planar milling machining of the workpiece is realized by the action of the frequency conversion motor on the gearbox controlled by the frequency conversion motor controller.

[0081] On the basis of the above structure, the magnetic force fixing assembly 6 is connected in each positioning slot 14 of the base 1, i.e. four groups of magnetic force fixing assemblies 6 are arranged at intervals in the four positioning slots 14 of the base 1. Each group of magnetic force fixing assemblies 6 is connected in a detachable structure at the bottom of the base 1, and the connection height of each group of magnetic force fixing assemblies 6 at the bottom of the base 1 is adjustable through the wedge and the tensioning screw 65. The base 1 is fixed on the operation platform by the suction of each group of magnetic force fixing assemblies 6.

[0082] More specifically, the magnetic force fixing assembly 6 mainly consists of the magnetic force suction disc 61, the wedge, and the tensioning screw 65. The lower wedge 62 in the wedge is fixedly connected to the top side of the magnetic force suction disc 61, and the bottom end of the tensioning screw 65 is fixed in a threaded structure to the top side of the magnetic force suction disc 61 and extends upward. The magnetic force suction disc 61 is fitted in the pull rod through hole 19 of the corresponding positioning slot 14 of the above-mentioned base 1 through the tensioning screw 65 connected to the top side, the magnetic force suction disc 61 and the wedge are accommodated in the corresponding positioning slot 14, and the bottom side of the magnetic force suction disc 61 is used for magnetic suction on the operation platform and as a fixed end. The extended section of the tensioning screw 65 at the top side of the base 1 is connected with the locking nut 66, and under the action of the wedge, the relative position of the locking nut 66 on the tensioning screw 65 is adjustable and serves as a movable connection end. The locking nut 66 cooperates with the tensioning screw 65 and the wedge to limit and fix the base connected with the fixed end-magnetic force suction disc 61. Therefore, the downward protruding height of the magnetic force suction disc 61 in the positioning slot 14 relative to the bottom side of the base 1 is adjusted by the wedge and the locking nut 66.

[0083] Based on the above specific structure of the magnetic force fixing assembly 6 and the matching structure with the base 1, the wedge block of the magnetic force fixing assembly 6 is composed of the lower wedge block 62, the upper wedge block 63 and the height adjusting screw 64. The lower wedge block 62 is fixedly connected at the top side of the magnetic force chuck one 61, serves as the basis for connecting the tensioning screw one 65 on the magnetic force chuck one 61, and also serves as the basis for the sliding adjustment of the upper wedge block 63. The lower wedge block 62 is threadedly connected at the top side of the magnetic force chuck one 65 with the bottom end of the tensioning screw one 65. The outer edge of the lower wedge block 62 has a positioning boss upwardly protruding and formed, and the positioning boss is provided with a screw waist type hole two 621 communicating with the inner and outer sides. The waist type direction of the screw waist type hole two 621 is formed along the height direction of the positioning boss. The upper wedge block 63 is provided with a screw waist type hole one 631 sleeving the tensioning screw one 65. The upper wedge block 63 is sleeved on the outer periphery of the tensioning screw one 65 through the screw waist type hole one 631 and is seated at the top side of the lower wedge block 62. The upper wedge block 63 is matched with the lower wedge block 62 in a bevel structure. The waist type direction of the screw waist type hole one 631 is directed to the direction of the positioning boss on the lower wedge block 62. The height adjusting screw 64 transversely passes through (loosely matches) the screw waist type hole two 621 on the lower wedge block 62, is threadedly connected with the upper wedge block 63 and extends into the screw waist type hole one 631. The rotating action of the height adjusting screw 64 in the screw waist type hole two 621 acts on the upper wedge block 63 to generate a linear displacement action, so that the upper wedge block 63 generates a sliding action of bevel rising / bevel falling on the lower wedge block 62. The screw waist type hole two 621 is adapted to the relative position of the height adjusting screw 64 when the upper wedge block 63 rises / falls. In this way, the wedge block structure matched in a specific manner is formed at the top side of the magnetic force chuck one 61.

[0084] When the rising cantilever milling machine is leveled on the operation platform, the height adjusting wedge block assembly 7 with the wedge structure between the base 1 and the operation platform is embedded in the corresponding pad block groove 16. At the same time, the fine adjustment screw 18 with the bottom end abutting against the operation platform (the adjustable range is within 2 mm) is threadedly embedded in the screw hole 17 corresponding to the lifting cavity 15. The threaded rising / falling of the fine adjustment screw 18 in the screw hole 17 forces the fine adjustment screw 18 to generate different relative heights on the operation platform to realize accurate and fine adjustment. In order to prevent the fine adjustment screw 18 from being loose in the screw hole 17, the lock nut is threadedly connected on the fine adjustment screw 18 in the lifting cavity 15.

[0085] The cantilever milling machine with the above structure supports and fixes the base 1 on the operation platform through the mutual cooperation of the height adjusting pad block assembly 7 embedded in the pad block groove 16, the fine adjustment screw 18 connected in the screw hole 17 and the magnetic force fixing assembly 6 connected in the positioning groove 14 when the workpiece is milled. At this time, the bottom end of the rotary bearing 13 at the bottom of the base 1 is separated from the operation platform.

[0086] The cantilever milling machine with the above structure is supported and fixed on the base 1, and the height adjusting pad assembly 7 embedded in the pad groove 16, the fine adjustment screw 18 connected in the screw hole 17, and the magnetic force fixing assembly 6 connected in the positioning groove 14 are disassembled, so that the base 1 falls back on the work platform. The base 1 is seated on the work platform through the bottom end of the inner ring 132 of the rotary bearing 13, and the bottom surface of the base 1 is still gap-fitted with the work platform. The base 1 can rotate around the inner ring 132 of the rotary bearing 13 as the center on the work platform, so that the cantilever milling machine can be flexibly rotated and adjusted on the work platform.

[0087] In order to facilitate the flexible translation of the cantilever milling machine, four groups of hydraulic displacement mechanisms 9 are further included, which are detachably fitted with the base 1. Each group of hydraulic displacement mechanisms 9 mainly consists of a hydraulic jack 92, a roller 91 and a hydraulic pump 93. The bottom end of the hydraulic jack 92 is connected with the roller 91, and the hydraulic pump 93 is used to pressurize / depressurize the hydraulic jack 92. The hydraulic pump 93 can be an electric pump or a manual pump. When the cantilever milling machine needs to be translated on the work platform, the height adjusting pad assembly 7 embedded in the pad groove 16, the fine adjustment screw 18 connected in the screw hole 17, and the magnetic force fixing assembly 6 connected in the positioning groove 14 are disassembled. The hydraulic jacks 92 of each group of hydraulic displacement mechanisms 9 are distributed in the corresponding positioning grooves 14 at the bottom of the base 1 and between the work platform and the base 1. The rollers 91 at the bottom of the hydraulic jacks 92 are seated on the work platform, and the rotation directions of the rollers 91 of each group of hydraulic displacement mechanisms 9 follow the translation direction. The top of the hydraulic jack 92 lifts the base 1 under the action of the hydraulic pump 93, so that the bottom surface of the base 1 is separated from the work platform, and the bottom end of the rotary bearing 13 is also separated from the work platform. The cantilever milling machine can be pushed to realize the translation adjustment on the work platform.

[0088] Embodiment 2

[0089] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0090] The wedge block of the magnetic force fixing assembly is composed of wedge block assemblies arranged alone on the outer side of the tension screw.

[0091] This embodiment can realize the height adjustment and fixing of the magnetic force fixing assembly, but the stability is poor, and it is not the preferred option.

[0092] Embodiment 3

[0093] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0094] The base is formed by a structural member with good bending stiffness, and the fine adjustment screw on the base and the lifting cavity and the screw hole on the base are removed.

[0095] This embodiment can realize leveling support of the cantilever milling machine on the work platform by adjusting the wedge block assembly and the magnetic fixing assembly, but the increase of the base stiffness will inevitably affect the weight and portability.

[0096] Embodiment 4

[0097] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0098] Remove the wedge block assembly for leveling the cantilever milling machine and the wedge block slot on the base.

[0099] This embodiment needs to realize leveling support of the cantilever milling machine on the work platform by cooperating the magnetic fixing assembly and the fine adjustment screw, but the fine adjustment screw is not conducive to rough adjustment in a large size range, which will increase the operation amount of leveling operation and reduce the leveling efficiency.

[0100] Embodiment 5

[0101] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0102] The screw hole on the base is directly penetrated through the top and bottom sides of the base, and the lifting cavity structure is cancelled.

[0103] Embodiment 6

[0104] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0105] The base is fixedly connected with the inner ring of the slewing bearing, and movably connected with the outer ring of the slewing bearing in a rolling manner or directly kept a distance fit, and the outer ring bottom end of the slewing bearing is protruded downward from the bottom surface of the base.

[0106] When rotating and adjusting on the work platform, the base is seated on the work platform through the outer ring bottom end of the slewing bearing.

[0107] Embodiment 7

[0108] This embodiment adopts the cantilever milling machine of Embodiment 1, and adopts a milling operation method for milling the anchoring plane of the suspension bridge, i.e. the top surface of the grid for anchoring and installing the saddle at the construction site of the suspension bridge, and the grid structure is as shown in Figure 6 The specific process steps include:

[0109] Step 1. According to the technical requirement of the need for planar milling due to the out-of-gauge deformation of the anchored grid top surface, the cantilever milling machine is lifted and moved to the preset reference position (the left side of the A area) of the anchored grid 10 top surface, and the top surface of the grid 10 is used as the work platform of the cantilever milling machine;

[0110] The base 1 is rotated through the slewing bearing 13, so that the length direction of the base 1 is basically parallel to the length direction of the A area;

[0111] By adjusting the wedge block assembly 7 and the fine adjustment screw 18, the base 1 of the cantilever milling machine is leveled on the top surface of the grid 10, and the bottom end of the slewing bearing 13 on the base 1 is lifted off the top surface of the grid 10;

[0112] The base 1 of the cantilever milling machine is magnetically fixed on the top surface of the grid 10 by the magnetic fixing assembly 6;

[0113] To ensure the reliability of the cantilever milling machine, the back pressing plate assembly 8 is used to press and fix the base 1 from the top side. The back pressing plate assembly 8 mainly consists of a magnetic chuck two 81, a support pad 83, a pressing plate 84, and a tensioning screw two 85. The bottom side of the magnetic chuck two 81 is fixed to the top surface of the grid 10 beside the base 1 (without interfering with the current processing area). The tensioning screw two 85 is fixed to the top side of the magnetic chuck two 81 through the connecting steel plate 82 and extends upward. The support pad 83 is arranged on the top side of the magnetic chuck two 81 (i.e., on the top side of the connecting steel plate 82). Compared with the position of the base 1, the support pad 83 is on the outside of the tensioning screw two 85. The pressing plate 84 has a waist-shaped screw hole along the length direction. The outer end of the pressing plate 84 is seated on the top side of the support pad 83, and the inner end is seated on the top side of the base 1. The tensioning screw two 85 passes through the screw hole of the pressing plate 84 and is locked by a locking nut two 86. Generally, the height of the support pad 83 is slightly higher than that of the leveled base 1, forming a downward tensioning.

[0114] Step 2. Start the cantilever milling machine and perform planar milling on the current milling area-A set on the top surface of the grid 10.

[0115] During processing, the tool is set according to the highest point of the detected plane data of the current milling area-A, and the processing allowance, the amount of feed, and the motion trail of the cantilever milling machine are set according to the determined height difference.

[0116] Step 3. After completing the processing of the area-A in step 2, release the fixation and leveling of the base 1 by the magnetic fixing assembly 6, the wedge block assembly 7, the fine adjustment screw 18, and the back pressing plate assembly 8, and lower the base 1 on the top surface of the grid 10, so that the bottom end of the inner ring 132 of the slewing bearing 13 is seated on the top surface of the grid 10.

[0117] Step 4. Rotate the base 1 on the top surface of the grid 10 around the inner ring 132 of the slewing bearing 13 as the center to the selected next milling area-B.

[0118] After rotation, the length direction of the base 1 is basically parallel to the length direction of the area-B.

[0119] Lift the base 1 of the cantilever milling machine on the top surface of the grid 10 by the hydraulic displacement mechanism 9, and translate it to the new preset reference position-B beside the area by the hydraulic displacement mechanism 9.

[0120] Step 5. Remove the hydraulic displacement mechanism 9 of step 4;

[0121] Repeat step 1 to level and fix the cantilever milling machine base 1 on the top surface of the grid 10;

[0122] Repeat step 2 to perform the planar milling processing on the newly set current milling area-B of the top surface of the grid 10;

[0123] Repeat steps 3 to 5 until all the milling areas-C, D, E, F, G, H, I, J of the top surface of the grid 10 are sequentially processed, and then remove the cantilever milling machine from the top surface of the grid 10.

[0124] Example 8

[0125] The other contents of the present example are the same as those of example 7, except that:

[0126] Remove the back plate assembly.

[0127] The above examples are only used to illustrate the present application, but not to limit it.

[0128] Although the present application has been described in detail with reference to the above examples, it should be understood by those skilled in the art that modifications can be made to the above examples, or equivalent replacements can be made to some technical features, such as the cantilever milling machine of the present application can be used for other workpieces which are not convenient to enter the workshop and need to be planarly milled on the construction site, etc., and the wedge groove, positioning groove and lifting cavity on the base are of other numbers, etc.; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the present application.

Claims

1. A cantilever milling machine, comprising a milling machine body consisting of a base (1), a column (2), a crossbeam (3), a slide (4), and a milling head (5); In the main structure of the milling machine, the base (1) is a slender structure, the bottom of the column (2) is mounted on the base (1) with a linear lateral movement structure, the slide (4) is mounted on one side of the column (2) with a linear vertical movement structure, the crossbeam (3) is mounted on the slide (4) with a linear lateral movement structure, and the milling head (5) is fixed at one end of the crossbeam (3) with the milling cutter (53) facing downwards; At the bottom of both sides of the base (1) along the length direction, there are multiple sets of magnetic fixing components (6) arranged at intervals. The base (1) is attracted and fixed to the working platform by each set of magnetic fixing components (6). Its features are: Each set of magnetic fixing components (6) is detachably connected to the bottom of the base (1), and the connection height of each set of magnetic fixing components (6) at the bottom of the base (1) is adjustable by wedges and tension screws (65). A rotary bearing (13) is connected to the center of the base (1). The base (1) is fixedly connected to the outer ring (131) / inner ring (132) of the rotary bearing (13). The bottom end of the inner ring (132) / bottom end of the outer ring (131) of the rotary bearing (13) protrudes from the bottom surface of the base (1). When the workpiece is milled, the base (1) is supported and fixed on the work platform by each set of magnetic fixing components (6), and the bottom end of the rotary bearing (13) is detached from the work platform. When rotating and adjusting on the work platform, the support and fixation of each set of magnetic fixing components (6) on the base (1) are released. The bottom end of the inner ring (132) / bottom end of the outer ring (131) of the slewing bearing (13) is located on the work platform. The base (1) can rotate on the work platform with the inner ring (132) / outer ring (131) of the slewing bearing (13) as the center.

2. The cantilever milling machine according to claim 1, characterized in that: The bottom of the base (1) is used as a set position for connecting the corresponding magnetic fixing component (6), and a positioning groove (14) with the corresponding edge is formed in an upward concave structure. The base (1) at the top of the positioning groove (14) has a waist-shaped pull rod through hole (19), and the waist-shaped direction of the pull rod through hole (19) is formed along the length direction of the base (1). The magnetic fixing assembly (6) mainly consists of a magnetic chuck (61), a wedge, and a tensioning screw (65). The tensioning screw (65) is fixed to the top side of the magnetic chuck (61) and extends upward. The wedge is arranged on the top side of the magnetic chuck (61). The magnetic chuck (61) is inserted into the corresponding pull rod through hole (19) on the base (1) via a tensioning screw (65) connected to the top side. The magnetic chuck (61) and the wedge are housed in the corresponding positioning groove (14). A locking nut (66) is connected to the extension of the tensioning screw (65) at the top side of the base (1). The downward protrusion height of the magnetic chuck (61) relative to the bottom side of the base (1) in the positioning groove (14) is adjusted by the wedge.

3. The cantilever milling machine according to claim 2, characterized in that: The wedge of the magnetic fixing assembly (6) is composed of a lower wedge (62), an upper wedge (63) and a height adjustment screw (64); The lower wedge (62) is fixedly connected to the top side of the magnetic chuck (61), and the lower wedge (62) is threadedly connected to the bottom end of the tensioning screw (65). The outer edge of the lower wedge (62) has an upwardly protruding positioning boss. The positioning boss has a screw waist-shaped through hole (621) connecting the inner and outer sides. The waist-shaped direction of the screw waist-shaped through hole (621) is formed along the height direction of the positioning boss. The upper wedge (63) has a screw waist-shaped through hole (631) for mounting the tensioning screw (65). The upper wedge (63) is mounted on the outer periphery of the tensioning screw (65) through the screw waist-shaped through hole (631) and is located on the top side of the lower wedge (62). The upper wedge (63) cooperates with the lower wedge (62) with a beveled structure. The waist-shaped direction of the screw waist-shaped through hole (631) is towards the direction of the positioning boss on the lower wedge (62). The height adjustment screw (64) passes laterally through the screw waist-shaped through hole (621) on the lower wedge (62) and is connected to the upper wedge (63) by a threaded structure. The rotation of the height adjustment screw (64) in the screw waist-shaped through hole (621) causes the upper wedge (63) to slide on the lower wedge (62) with the slope rising / falling.

4. The cantilever milling machine according to claim 1 or 2, characterized in that: At each end of the base (1) along its length, there are pad grooves (16) formed with an upward concave structure that connect to the corresponding edges. The pad grooves (16) are located outside the positioning grooves (14) on the same side. When the base (1) is leveled on the work platform, a wedge-shaped structure height adjustment wedge assembly (7) is installed in the corresponding pad slot (16) between the base (1) and the work platform.

5. The cantilever milling machine according to claim 4, characterized in that: On each side of the base (1) along the length direction, a plurality of screw holes (17) are provided in a spaced arrangement. These screw holes (17) on the same side are spaced on the outer and inner sides of the positioning groove (14) on that side. When the base (1) is leveled on the work platform, a fine adjustment screw (18) is threaded through the corresponding screw hole (17). The bottom end of the fine adjustment screw (18) is used to abut against the work platform during the screw raising / lowering process.

6. The cantilever milling machine according to claim 1, characterized in that: The milling machine also includes multiple sets of hydraulic displacement mechanisms (9), which are detachably coupled to the base (1); Each hydraulic displacement mechanism (9) is mainly composed of a hydraulic jack (92), a roller (91) and a hydraulic pump (93). The bottom end of the hydraulic jack (92) is connected to the roller (91), and the hydraulic pump (93) is used to pressurize / depressurize the hydraulic jack (92). When the platform is moved horizontally, the support and fixation of the base (1) are released. The hydraulic jacks (92) of each hydraulic displacement mechanism (9) are distributed between the platform and the base (1). The rollers (91) at the bottom of the hydraulic jacks (92) are located on the platform. The top of the hydraulic jacks (92) lifts the base (1) so that the bottom surface of the base (1) is separated from the platform. The rollers (91) of each hydraulic displacement mechanism (9) rotate in the same direction as the horizontal movement.

7. The cantilever milling machine according to claim 6, characterized in that: When the hydraulic jack (92) of the hydraulic displacement mechanism (9) lifts the base (1), the hydraulic jack (92) is embedded in the corresponding positioning groove (14) at the bottom of the base (1).

8. A method for machining the anchorage plane of a suspension bridge using a cantilever milling machine according to any one of claims 1 to 7, wherein the anchorage plane is the top surface of a grid used for cable saddle installation at the suspension bridge construction site, characterized in that... The method for milling the top surface of the anchored grid includes the following process steps: Step 1. Lift the cantilever milling machine to the preset reference position on the anchored top surface of the grid, and use the top surface of the grid as the working platform of the cantilever milling machine; By adjusting the wedge block assembly and the fine-tuning screw, the base of the cantilever milling machine is leveled on the top surface of the grid, so that the bottom end of the rotary bearing on the base is removed from the top surface of the grid. The base of the cantilever milling machine is magnetically fixed to the top surface of the grid using a magnetic fixing assembly; Step 2. Start the cantilever milling machine and perform planar milling on the currently milled area set on the top surface of the grid; Step 3. After completing the current milling part in Step 2, release the magnetic fixing component, the height adjustment wedge component and the fine adjustment screw from fixing and leveling the cantilever milling machine base, so that the base is lowered on the top surface of the grid, and the bottom end of the inner ring / outer ring of the rotary bearing sits on the top surface of the grid. Step 4. Using the inner / outer ring where the slewing bearing is located as the center, rotate the base on the top surface of the grating to the selected next milling section; After rotating into position, the cantilever milling machine base is lifted off the top surface of the grid by a hydraulic displacement mechanism, and then translated to a new preset reference position by a hydraulic displacement mechanism on the top surface of the grid. Step 5. Remove the hydraulic displacement mechanism from Step 4; Repeat step 1 to level and fix the cantilever milling machine base on the top surface of the grid; Repeat step 2. Perform planar milling on the newly defined area to be milled on the top surface of the grating; Repeat steps 3 to 5 until all parts of the top surface of the grating to be milled are finished. Then lift and remove the cantilever milling machine from the top surface of the grating.

9. The method for machining the anchorage plane of a suspension bridge using a cantilever milling machine according to claim 8, characterized in that: In steps 2 and 5, planar milling is performed on the current part to be milled by setting the tool at the highest point of the detected planar data of the current part to be milled. The machining allowance, number of feeds, and motion trajectory of the cantilever milling machine are set based on the measured height difference.

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