A kind of bucket wheel excavator door type slewing bearing beam factory trial installation auxiliary tool and method

Abstract

The application discloses a kind of bucket wheel excavator door type rotation bearing beam factory in-house test installation auxiliary tool and method, including pitch hinge hole coaxial tool and rotation center coaxial tool;Pitch hinge hole coaxial tool includes horizontal center shaft, side clamping flange, side baffle, and middle column one and middle column two are fixed in the both ends of horizontal center shaft by side clamping flange and side baffle, ensure that the coaxial degree of material taking arm pitch hinge hole meets the requirements of drawing;Rotation center coaxial tool includes vertical center shaft, top clamping flange, top baffle, support base, top is fixed on vertical center shaft by top clamping flange and top baffle, bottom is fixed together by support base, and the coaxial degree of rotation shaft of material discharge arm to rotation center meets the requirements of drawing is guaranteed.The application can efficiently make product assembly precision meet the requirements of drawing, and also can support and connect each component, improve the overall stability of product, reduce the safety risk in production process.

Description

Technical Field

[0001] This invention belongs to the field of mechanical engineering equipment technology, and in particular relates to a trial assembly tool and method for a gantry-type slewing beam of a bucket wheel excavator. Background Technology

[0002] Bucket wheel excavators are mining equipment used in large open-pit mines with soft or medium-hard ore deposits due to their high excavation efficiency and wide operating range. They are mainly used for soil stripping, ore extraction, ore handling, and loading operations. The gantry-type slewing load-bearing beam, as the core load-bearing component responsible for a series of complex actions including excavation, lifting, and unloading, consists of five parts: a top crossbeam, two middle columns, a load-bearing beam slewing base, and a tail box girder. Its dimensions are 28×18×14.4m. Its complex structure presents significant challenges in controlling welding deformation and requires high precision in on-site assembly. The on-site weld gap must be ≤6mm, misalignment ≤4mm, coaxiality of the boom tilting hinge hole ≤2mm, coaxiality of the discharge boom rotation axis relative to the slewing center ≤2.8mm, and the flatness and centerline error of the assembled top crossbeam, load-bearing beam slewing base, and tail box girder must all be ≤1.5mm.

[0003] To ensure the aforementioned precision during final assembly on-site, after manufacturing each component in the factory, the five major components need to be trial-assembled according to the drawings. This trial assembly is used to identify and correct any issues arising from the fit between components. Previously, during trial assembly, the load-bearing beam slewing base was first leveled on a platform according to the drawings, and then the tail box girder, middle column one, middle column two, and top crossbeam were assembled sequentially using overhead cranes and jacks. Temporary process clamps were welded between the components for fixation. However, because the components were assembled with rough dimensions during trial assembly, the dimensional tolerances differed significantly from the two coaxiality tolerances required. Therefore, to ensure the coaxiality met the requirements, repeated trial assembly of the top crossbeam, middle column one, middle column two, and load-bearing beam slewing base was necessary, involving welding and removing temporary clamps, which was time-consuming and labor-intensive. Furthermore, due to the large size of the component, the trial assembly involved extensive work at height, posing a significant safety risk. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an auxiliary tool and method for in-factory trial assembly of a gantry-type slewing bearing beam for bucket wheel excavators, solving the problems of low efficiency, high cost, and significant safety hazards in in-factory trial assembly of gantry-type slewing bearing beams for bucket wheel excavators.

[0005] The present invention is implemented as follows: a trial assembly auxiliary tool for a gantry-type slewing bearing beam of a bucket wheel excavator, including a pitching hinge hole coaxial tooling installed between the first and second middle columns, and a slewing center coaxial tooling installed between the top crossbeam and the slewing base of the bearing beam.

[0006] The pitch hinge hole coaxial tooling includes a transverse central shaft, a side clamping flange, and a side baffle. The transverse central shaft has a stop at both ends. The transverse central shaft is fixed at one end stop by engaging the lug of the central column 1 with the inner clamping flange 1, the outer clamping flange 1, and the side baffle 1. The transverse central shaft is fixed at the other end stop by engaging the lug of the central column 2 with the inner clamping flange 2, the outer clamping flange 2, and the side baffle 2.

[0007] The coaxial tooling for the rotary center includes a vertical central shaft, a top clamping flange, a top baffle, and a support base. The vertical central shaft has two stops at the top and one stop at the bottom. The vertical central shaft abuts against the lug of the top crossbeam at the lower top stop. The vertical central shaft is fixed at the upper top stop by the top clamping flange, the top baffle, and the lug of the top crossbeam. The vertical central shaft is connected to the support base at the bottom stop. The support base is installed on the rotary base of the load-bearing beam.

[0008] In the above technical solution, preferably, the transverse central axis is made of steel pipe, and the component is symmetrical about the center along the length direction.

[0009] In the above technical solution, preferably, one side of the inner clamping flange abuts against one end stop of the transverse central shaft, and the other side engages with one side of the lug of the central column; the side baffle is fixed on one end face of the transverse central shaft, and engages the outer clamping flange between the transverse central shaft and the other side of the lug of the central column.

[0010] One side of the inner clamping flange 2 abuts against the stop at the other end of the transverse central axis, and the other side engages with the lug of the middle column 2; the side baffle 2 is fixed on the end face of the other end of the transverse central axis, engaging the outer clamping flange 2 between the transverse central axis and the other side of the lug of the middle column 2.

[0011] In the above technical solution, preferably, the inner clamping flange one, the outer clamping flange one, the transverse central shaft one, and the central column one are all clearance fits, and the tolerances are all less than 0.8mm;

[0012] The inner clamping flange 2, the outer clamping flange 2, the transverse central shaft, and the middle column 2 are all clearance fits, with tolerances less than 0.8mm.

[0013] In the above technical solution, preferably, the side baffle one and the side baffle two are respectively engraved with a cross center line, which is used as a measurement reference during trial assembly.

[0014] In the above technical solution, preferably, the vertical central axis is welded together from steel pipes of different diameters;

[0015] The vertical center shaft is provided with a fixed support plate at the bottom stop of the top. The fixed support plate abuts against one side of the lug of the top crossbeam. The top baffle is fixed on the top surface of the vertical center shaft, and the top clamping flange is engaged between the vertical center shaft and the other side of the lug of the top crossbeam.

[0016] The vertical center shaft has a fixed baffle at the bottom stop, and the bottom of the vertical center shaft is embedded in the support base and is connected and fixed to the support base through the fixed baffle.

[0017] In the above technical solution, preferably, the top clamping flange, the vertical center shaft, and the top crossbeam are all clearance fit, with a tolerance of less than 0.8mm.

[0018] In the above technical solution, preferably, the upper and lower outer surfaces of the vertical central shaft are respectively provided with machined reference surfaces, which are used as measurement references during trial assembly.

[0019] In the above technical solution, preferably, the support base is formed by welding a panel and a stiffening plate located below the panel; the center of the panel is provided with a through hole one that mates with the vertical central axis, the panel around the through hole is provided with an internally threaded countersunk hole four, and the outer edge of the panel is provided with a machined surface and a through hole two that mates with the rotating base of the bearing beam.

[0020] Another object of the present invention is to provide a method for trial assembly of a gantry-type slewing beam for a bucket wheel excavator in a factory, comprising the following steps:

[0021] 1) Assemble the trial assembly platform so that its dimensions are larger than the outer contour of the support point after the connection between the load-bearing beam slewing base and the tail box girder, and adjust it so that the flatness of the trial assembly platform is ≤1.5mm;

[0022] 2) Mark a cross center line along the length and width direction on the upper surface of the bearing beam slewing base with the center of rotation as the reference point. Use it as the measurement reference during trial assembly. Then hoist it to the trial assembly platform, support the bearing beam slewing base with shims, and adjust its flatness with jacks. Measure the flatness of the machined surfaces of the two large flanges inside the center of rotation relative to the trial assembly platform by a level instrument. The flatness of both surfaces is ≤1.5mm.

[0023] 3) Connect the first and second middle columns together using the pitch hinge hole coaxial fixture in the above-mentioned trial assembly auxiliary tool, and weld two process tie rods on the side of the first and second middle columns away from the pitch hinge hole coaxial fixture.

[0024] 4) Hoist the two assembled central columns to the top of the rotating base of the bearing beam for trial assembly. Using the center lines of the crosses on side baffles one and two, and the center line of the crosses on the rotating base of the bearing beam as references, use a steel wire and a level to measure and ensure that the central axis of the coaxial tooling for the pitch hinge holes is horizontal relative to the machining surfaces of the two large flanges inside the rotating center of the bearing beam rotating base, and the horizontal distance from the center line of the crosses on the rotating base of the bearing beam is 1150±1.5mm. At the same time, re-measure the coaxiality of the pitch hinge holes of central columns one and two, the flatness of the machining surfaces of the two large flanges inside the rotating center of the bearing beam rotating base relative to the trial assembly platform, and other dimensions on the drawings until the requirements are met. After adjustment, weld temporary process connection plates around the weld seam on site for fixation, and weld process tie rods between central columns one and two and the rotating base of the bearing beam.

[0025] 5) Securely assemble the coaxial jig of the rotation center in the above-mentioned trial assembly fixture with the rotating base of the bearing beam, and together with the first and second central columns, perform a trial assembly of the top crossbeam based on the foundation. First, install the top crossbeam onto the coaxial jig of the rotation center to ensure coaxiality. Then, using the reference plane at the bottom of the vertical central axis and the cross center line on the rotating base of the bearing beam as references, use a steel wire and a level to measure and make corresponding adjustments until the requirements are met. At the same time, re-measure the dimensions on other drawings to ensure they meet the requirements. After adjustment, weld temporary process connection plates around the weld seam on site for fixation.

[0026] 6) Mark the center line of the outer contour in the width direction on the upper and lower surfaces of the tail box girder as the measurement benchmark during trial assembly. Then hoist it to the trial assembly platform and use adjustable shims to support and adjust its flatness so that the deviation between its center line and the cross center line on the slewing base of the bearing beam is ≤1.5mm. At the same time, re-measure other dimensions on the drawings until the requirements are met. After adjustment, weld temporary process connection plates around the weld seam on site for fixation.

[0027] 7) After all assembly is completed, the overall dimensions are remeasured. If they are qualified, the on-site positioning components are welded in, and after inspection, they are disassembled.

[0028] The advantages and positive effects of this invention are:

[0029] The auxiliary tool and method for in-factory trial assembly of the gantry slewing bearing beam of the bucket wheel excavator of the present invention can not only enable the rapid installation and positioning of each component during the in-factory trial assembly of the gantry slewing bearing beam of the bucket wheel excavator, ensuring that the product assembly accuracy meets the drawing requirements, improving production efficiency while reducing the labor intensity of personnel, but also play a supporting and connecting role for each component, thereby improving the overall stability of the product and reducing safety risks in the production process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the installation of the trial assembly aid of the present invention during operation;

[0031] Figure 2 This is a cross-sectional view of the pitch hinge hole coaxial tooling in the trial assembly auxiliary tooling of the present invention;

[0032] Figure 3 This is a cross-sectional view of the coaxial tooling with a rotating center in the trial assembly tooling of the present invention;

[0033] Figure 4 This is a bottom view of the support base in the coaxial tooling of the rotary center of the present invention.

[0034] In the diagram: 1. Coaxial tooling for pitch hinge hole; 1-1. Transverse center shaft; 1-21. Inner clamping flange one; 1-22. Inner clamping flange two; 1-31. Outer clamping flange one; 1-32. Outer clamping flange two; 1-41. Side baffle one; 1-42. Side baffle two; 1-51. Fastener one; 1-52. Fastener two;

[0035] 2. Coaxial tooling for the rotation center; 2-1. Vertical central shaft; 2-11. Fixed support plate; 2-12. Fixed baffle; 2-2. Top clamping flange; 2-3. Top baffle; 2-4. Support base; 2-4-1. Panel; 2-4-2. Rib plate; 2-51. Fastener three; 2-52. Fastener four; 2-53. Fastener five;

[0036] 3. Top crossbeam; 4. Middle column one; 5. Middle column two; 6. Load-bearing beam slewing base; 7. Tail box girder. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0038] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "a," "b," "c," "d," "e," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "joining," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Please see Figures 1-4 An embodiment of the present invention provides a trial assembly tool for a gantry-type slewing load-bearing beam of a bucket wheel excavator, comprising: a pitch hinge hole coaxial tool 1 and a slewing center coaxial tool 2. The pitch hinge hole coaxial tool 1 is installed between the middle column 1 4 and the middle column 2 5, and the slewing center coaxial tool 2 is installed between the top crossbeam 3 and the load-bearing beam slewing base 6.

[0041] The coaxial tooling 1 for the pitch hinge hole includes a transverse central shaft 1-1, side clamping flanges, and side baffles. Both ends of the transverse central shaft 1-1 are provided with stops. At one end of the stop, the transverse central shaft 1-1 is fixed to the lug of the central column 4 by the inner clamping flange 1-21, the outer clamping flange 1-31, and the side baffle 1-41. At the other end of the stop, the transverse central shaft 1-1 is fixed to the lug of the central column 5 by the inner clamping flange 2-22, the outer clamping flange 2-32, and the side baffle 2-42. The central columns 4 and 5 are installed and fixed at both ends of the transverse central shaft 1-1, thereby ensuring that the coaxiality of the pitch hinge hole of the material handling arm meets the drawing requirements.

[0042] The coaxial fixture for the rotating center includes a vertical central shaft 2-1, a top clamping flange 2-2, a top baffle 2-3, and a support base 2-4. The vertical central shaft 2-1 has two stops at its top and one stop at its bottom. The vertical central shaft 2-1 abuts against the lug of the top crossbeam 3 at its lower top stop. The vertical central shaft 2-1 is fixed to the lug of the top crossbeam 3 at its upper top stop via the top clamping flange 2-2 and the top baffle 2-3. The vertical central shaft 2-1 is connected to the support base 2-4 at its bottom stop. The support base 2-4 is mounted on the rotating base 6 of the load-bearing beam. The top crossbeam 3 and the rotating base 6 of the load-bearing beam are fixed to both ends of the vertical central shaft 2-1, thereby ensuring that the coaxiality of the discharge arm's rotating shaft with respect to the rotating center meets the drawing requirements.

[0043] During factory trial assembly, this auxiliary tool not only ensures that the product assembly accuracy meets the drawing requirements, but also provides support and connection for each component, thereby improving the overall stability of the product and reducing safety risks during the production process.

[0044] In a preferred embodiment, the coaxial tooling for the pitch hinge hole includes a transverse central shaft 1-1, an inner clamping flange 1-21, an outer clamping flange 1-31, an inner clamping flange 2-22, an outer clamping flange 2-32, a side baffle 1-41, a side baffle 2-42, a fastener 1-51, and a fastener 2-52. During operation, the inner clamping flange 1-21, the outer clamping flange 1-31, the inner clamping flange 2-22, the outer clamping flange 2-32, the side baffle 1-41, the side baffle 2-42, the fastener 1-51, and the fastener 2-52 are used to install and fix the central column 4 and the central column 5 at both ends of the transverse central shaft 1-1, thereby ensuring that the coaxiality of the pitch hinge hole of the material handling arm meets the drawing requirements.

[0045] The transverse central shaft 1-1 is made of steel pipe and is symmetrical about the center along its length. The two ends of the transverse central shaft 1-1 are respectively provided with stop mouths to fix it to the central column 1 4, the central column 2 5 and the side clamping flange. The end faces of both ends are respectively provided with internal thread countersunk hole 1 and internal thread countersunk hole 2 for connecting with the side baffle by bolts.

[0046] One side of the inner clamping flange 1-21 abuts against one end stop of the transverse central shaft 1-1, and the other side engages with one side of the lug of the central column 4; the side baffle 1-41 is fixed to one end face of the transverse central shaft 1-1, engaging the outer clamping flange 1-31 between the transverse central shaft 1-1 and the other side of the lug of the central column 4. Specifically, an internally threaded countersunk hole is provided on one end face of the transverse central shaft 1-1, and the side baffle 1-41 is connected and fixed to the transverse central shaft 1-1 by fastener 1-51.

[0047] One side of the inner clamping flange 1-22 abuts against the stop at the other end of the transverse central shaft 1-1, and the other side engages with the lug of the central column 5. The side baffle 1-42 is fixed to the end face of the other end of the transverse central shaft 1-1, engaging the outer clamping flange 1-32 between the transverse central shaft 1-1 and the other side of the lug of the central column 5. Specifically, an internally threaded countersunk hole 2 is provided on the end face of the other end of the transverse central shaft 1-1, and the side baffle 1-42 is connected and fixed to the transverse central shaft 1-1 by fastener 1-52.

[0048] In a preferred embodiment, the inner clamping flange 1-21 and the outer clamping flange 1-31 are all clearance fits with the transverse central shaft 1-1 and the central column 4, with tolerances less than 0.8 mm; the inner clamping flange 2-22 and the outer clamping flange 2-32 are all clearance fits with the transverse central shaft 1-1 and the central column 2-5, with tolerances less than 0.8 mm.

[0049] In a preferred embodiment, the side baffle 1-41 and the side baffle 2-42 are respectively engraved with cross center lines, which are used as measurement references during trial assembly.

[0050] In a preferred embodiment, the coaxial tooling 2 of the rotary center comprises a vertical central shaft 2-1, a top clamping flange 2-2, a top baffle 2-3, a fixed support plate 2-11, a fixed baffle 2-12, a support base 2-4, fasteners three 2-51, four 2-52, and five 2-53. During operation, the top beam 3 is fixedly mounted on the vertical central shaft 2-1 via the fixed support plate 2-11, the top clamping flange 2-2, the top baffle 2-3, and the three fasteners 2-51. The bottom connects and fixes the vertical central shaft 2-1 to the rotating base 6 of the bearing beam via the fixed baffle 2-12, the support base 2-4, the four fasteners 2-52, and the five fasteners, thereby ensuring that the coaxiality of the discharge arm's rotating shaft with respect to the rotary center meets the drawing requirements.

[0051] The vertical center shaft 2-1 is welded together from steel pipes of different diameters, with the upper part using small-diameter steel pipes and the lower part using large-diameter steel pipes. The top of the vertical center shaft 2-1 has two stops and the bottom has one stop. A fixed support plate 2-11 is welded to the lower stop of the top of the vertical center shaft 2-1, and a fixed baffle 2-12 is welded to the bottom stop of the vertical center shaft 2-1. The fixed support plate 2-11 and the fixed baffle 2-12 are steel plates of different diameters welded onto the vertical center shaft 2-1. The bottom fixed baffle 2-12 is used to engage and fix with the support base 2-4. The top surface of the vertical center shaft 2-1 has an internally threaded countersunk hole three, which is used to engage with the top baffle 2-3 by bolts.

[0052] The fixed support plate 2-11 abuts against one side of the lug of the top crossbeam 3, and the top baffle 2-3 is fixed on the top surface of the vertical center shaft 2-1. The top clamping flange 2-2 is engaged between the vertical center shaft 2-1 and the other side of the lug of the top crossbeam 3. Specifically, the top surface of the vertical center shaft 2-1 is provided with an internal thread countersunk hole three, and the top baffle 2-3 is connected and fixed to the vertical center shaft 2-1 by fastener three 2-51.

[0053] The bottom of the vertical central shaft 2-1 is embedded in the support base 2-4 and is connected and fixed to the support base 2-4 by a fixing baffle 2-12. Specifically, the support base 2-4 has an internally threaded countersunk hole four on its inner top surface, and the fixing baffle 2-12 is connected and fixed to the support base 2-4 by fastener four 2-52.

[0054] The top clamping flange 2-2, the vertical center shaft 2-1, and the top crossbeam 33 are all clearance fits, with tolerances less than 0.8mm.

[0055] The upper and lower outer surfaces of the vertical center shaft 2-1 are respectively provided with machined reference surfaces, which are used as measurement references during trial assembly. Specifically, two rings can be machined on the outer blank surface of the vertical center shaft, and a steel wire can be used to measure the verticality of the vertical center shaft during use.

[0056] In a preferred embodiment, the support base 2-4 is formed by welding together a panel 2-4-1 and a cross-shaped rib plate 2-4-2 located below the panel 2-4-1. The panel 2-4-1 has a through hole at its center that mates with the vertical central axis 2-1. Four internally threaded countersunk holes are provided around the through hole on the panel 2-4-1. The outer edge of the panel 2-4-1 has a machined surface and a second through hole for installation with the rotating base 6 of the supporting beam. Specifically, the panel 2-4-1 is connected and fixed to the rotating base 6 of the supporting beam using fasteners 2-53.

[0057] The fasteners 1-51, 2-52, 3-51, 4-52, and 5-53 mentioned above all use bolts and spring washers.

[0058] The method for in-plant trial assembly of the gantry slewing beam of a bucket wheel excavator based on the above-mentioned trial assembly auxiliary equipment includes the following steps:

[0059] 1) Assemble the trial assembly platform. Connect multiple platforms together to form the trial assembly platform. Make the dimensions of the trial assembly platform larger than the outer contour of the support point after the connection of the load-bearing beam slewing base 6 and the tail box beam 7, and adjust it so that the flatness of the trial assembly platform is ≤1.5mm.

[0060] 2) On the upper surface of the bearing beam slewing base 6, with the center of rotation as the base point, engrave a cross center line along the length and width direction to be used as the measurement reference during trial assembly. Then, hoist it to the trial assembly platform, support the bearing beam slewing base 6 with 8 shims, and adjust its flatness with 4 jacks. Measure with a level to ensure that the flatness of the machined surfaces of the upper and lower large flanges inside the center of rotation relative to the trial assembly platform is ≤1.5mm.

[0061] 3) Connect the middle column 1 and the middle column 2 5 together using the pitch hinge hole coaxial tooling 1 in the above-mentioned trial assembly auxiliary tooling, and weld two process tie rods on the side of the middle column 1 and the middle column 2 5 away from the pitch hinge hole coaxial tooling 1 to strengthen the fixation of the middle column 1 and the middle column 2 5.

[0062] 4) Hoist the two assembled central columns to the top of the rotating base 6 of the bearing beam for trial assembly. Using the cross center lines on side baffle 1-41 and side baffle 2-42, and the cross center line on the rotating base 6 of the bearing beam as references, use a steel wire and a level to measure and ensure that the central axis of the coaxial tooling 1 for the pitch hinge hole is horizontal relative to the machining surfaces of the two large flanges inside the rotation center of the rotating base 6 of the bearing beam, and the horizontal distance between it and the cross center line on the rotating base 6 of the bearing beam is 1150±1. 5mm; at the same time, re-measure the coaxiality of the pitch hinge holes of the first and second central columns 4 and 5, the flatness of the upper and lower large flange machining surfaces inside the rotation center of the bearing beam slewing base 6 relative to the trial assembly platform, and other dimensions on the drawings. If necessary, the on-site weld bevels need to be adjusted until they meet the relevant requirements such as gap and misalignment. After adjustment, weld temporary process connection plates around the on-site welds for fixation, and weld process tie rods between the first and second central columns 4 and the bearing beam slewing base 6 to enhance safety and stability.

[0063] 5) Securely assemble the coaxial rotating center fixture 2 of the above-mentioned trial assembly auxiliary equipment with the rotating base 6 of the bearing beam, and together with the central column 4 and the central column 5, perform a trial assembly of the top crossbeam 3 based on the foundation. First, install the top crossbeam 3 onto the coaxial rotating center fixture 2 to ensure coaxiality, and then perform a trial assembly of the top crossbeam 3. Using the reference plane on the vertical center axis 2-1 and the cross center line on the rotating base 6 of the bearing beam as references, use a steel wire and a level to measure and ensure that the verticality of the vertical center axis 2-1 and the horizontal distance between the center of the transverse center axis 1-1 and the center of the vertical center axis 2-1 are 1150±1.5mm. At the same time, re-measure other dimensions on the drawings to ensure that they meet the requirements. If necessary, the weld bevel on site needs to be adjusted until the relevant requirements such as gap and misalignment are met. After adjustment, weld temporary process connection plates around the weld on site for fixation.

[0064] 6) Mark the center line of the outer contour in the width direction on the upper and lower surfaces of the tail box girder 7 as the measurement benchmark during trial assembly. Then hoist it to the trial assembly platform and use 4 adjustable shims to support and adjust its flatness so that the deviation between its center line and the cross center line on the rotating base 6 of the bearing beam is ≤1.5mm. At the same time, re-measure other dimensions on the drawings. If necessary, the weld bevel on site should be adjusted until the relevant requirements such as gap and misalignment are met. After adjustment, weld temporary process connection plates around the weld on site for fixation.

[0065] 7) After all assembly is completed, the overall dimensions are remeasured. If they are qualified, the on-site positioning components are welded in, and after inspection, they are disassembled.

[0066] The auxiliary tool and method for in-factory trial assembly of the gantry slewing bearing beam of the bucket wheel excavator of the present invention can not only enable the rapid installation and positioning of each component during the in-factory trial assembly of the gantry slewing bearing beam of the bucket wheel excavator, ensuring that the product assembly accuracy meets the drawing requirements, improving production efficiency while reducing the labor intensity of personnel, but also play a supporting and connecting role for each component, thereby improving the overall stability of the product and reducing safety risks in the production process.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A trial assembly fixture for a gantry-type slewing beam of a bucket wheel excavator, characterized in that: This includes a coaxial tooling for the pitch hinge hole installed between the first and second central columns, and a coaxial tooling for the rotation center installed between the top crossbeam and the rotating base of the load-bearing beam. The pitch hinge hole coaxial tooling includes a transverse central shaft, a side clamping flange, and a side baffle. The transverse central shaft has a stop at each end. The transverse central shaft is fixed at one end stop by engaging the lug of the central column 1 with the inner clamping flange 1, the outer clamping flange 1, and the side baffle 1. The transverse central shaft is fixed at the other end stop by engaging the lug of the central column 2 with the inner clamping flange 2, the outer clamping flange 2, and the side baffle 2. The coaxial tooling for the rotary center includes a vertical central shaft, a top clamping flange, a top baffle, and a support base. The vertical central shaft has two stops at the top and one stop at the bottom. The vertical central shaft abuts against the lug of the top crossbeam at the lower top stop. The vertical central shaft is fixed at the upper top stop by the top clamping flange, the top baffle, and the lug of the top crossbeam. The vertical central shaft is connected to the support base at the bottom stop. The support base is installed on the rotary base of the load-bearing beam.

2. The auxiliary tool for factory trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The transverse central axis is made of steel pipe and is symmetrical about the center along its length.

3. The auxiliary tool for trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: One side of the inner clamping flange abuts against one end of the transverse central shaft, and the other side engages with one side of the lug of the central column; the side baffle is fixed on one end face of the transverse central shaft, and engages the outer clamping flange between the transverse central shaft and the other side of the lug of the central column. One side of the inner clamping flange 2 abuts against the stop at the other end of the transverse central axis, and the other side engages with the lug of the middle column 2; the side baffle 2 is fixed on the end face of the other end of the transverse central axis, engaging the outer clamping flange 2 between the transverse central axis and the other side of the lug of the middle column 2.

4. The auxiliary tool for trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The inner clamping flange 1, the outer clamping flange 1, the transverse central shaft, and the central column 1 are all clearance fits, with tolerances less than 0.8mm. The inner clamping flange 2, the outer clamping flange 2, the transverse central shaft, and the middle column 2 are all clearance fits, with tolerances less than 0.8mm.

5. The auxiliary tool for trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The side baffle one and side baffle two are respectively engraved with a cross center line, which is used as a measurement reference during trial assembly.

6. The auxiliary tool for trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The vertical central axis is welded together from steel pipes of different diameters; The vertical center shaft is provided with a fixed support plate at the bottom stop of the top. The fixed support plate abuts against one side of the lug of the top crossbeam. The top baffle is fixed on the top surface of the vertical center shaft, and the top clamping flange is engaged between the vertical center shaft and the other side of the lug of the top crossbeam. The vertical center shaft has a fixed baffle at the bottom stop, and the bottom of the vertical center shaft is embedded in the support base and is connected and fixed to the support base through the fixed baffle.

7. The auxiliary tool for factory trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The top clamping flange, the vertical center shaft, and the top crossbeam are all clearance fits, with tolerances less than 0.8mm.

8. The auxiliary tool for trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The upper and lower outer surfaces of the vertical central shaft are respectively provided with machined reference surfaces, which are used as measurement references during trial assembly.

9. The auxiliary tool for trial assembly of the gantry-type slewing bearing beam for bucket wheel excavators according to claim 1, characterized in that: The support base is formed by welding together a panel and a stiffening plate located below the panel; the panel has a through hole 1 in the center that mates with the vertical central axis, and internal thread countersunk holes 4 are provided on the panel around the through hole. The outer edge of the panel has a machined surface and a through hole 2 that mates with the rotating base of the bearing beam.

10. A method for trial assembly in a factory of a gantry-type slewing beam for a bucket wheel excavator, characterized in that: The trial assembly method is implemented based on the trial assembly aids described in any one of claims 1-9, and includes the following steps: 1) Assemble the trial assembly platform so that its dimensions are larger than the outer contour of the support point after the connection between the load-bearing beam slewing base and the tail box girder, and adjust it so that the flatness of the trial assembly platform is ≤1.5mm; 2) Mark a cross center line along the length and width direction on the upper surface of the bearing beam slewing base with the center of rotation as the reference point. Use it as the measurement reference during trial assembly. Then hoist it to the trial assembly platform, support the bearing beam slewing base with shims, and adjust its flatness with jacks. Measure the flatness of the machined surfaces of the two large flanges inside the center of rotation relative to the trial assembly platform by a level instrument. The flatness of both surfaces is ≤1.5mm. 3) Connect the first and second middle columns together using the pitch hinge hole coaxial fixture in the above-mentioned trial assembly auxiliary tool, and weld two process tie rods on the side of the first and second middle columns away from the pitch hinge hole coaxial fixture. 4) Hoist the two assembled central columns to the top of the rotating base of the bearing beam for trial assembly. Using the center lines of the crosses on side baffles one and two, and the center line of the crosses on the rotating base of the bearing beam as references, use a steel wire and a level to measure and ensure that the central axis of the coaxial tooling for the pitch hinge holes is horizontal relative to the machining surfaces of the two large flanges inside the rotating center of the bearing beam, and the horizontal distance from the center line of the crosses on the rotating base of the bearing beam is 1150±1.5mm. At the same time, re-measure the coaxiality of the pitch hinge holes of central columns one and two, the flatness of the machining surfaces of the two large flanges inside the rotating center of the bearing beam relative to the trial assembly platform, and other dimensions on the drawings until the requirements are met. After adjustment, weld temporary process connection plates around the weld seam on site for fixation, and weld process tie rods between central columns one and two and the rotating base of the bearing beam. 5) Securely assemble the coaxial jig of the rotation center in the above-mentioned trial assembly fixture with the rotating base of the bearing beam, and together with the first and second central columns, perform a trial assembly of the top crossbeam based on the foundation. First, install the top crossbeam onto the coaxial jig of the rotation center to ensure coaxiality. Then, using the reference plane at the bottom of the vertical central axis and the cross center line on the rotating base of the bearing beam as references, use a steel wire and a level to measure and make corresponding adjustments until the requirements are met. At the same time, re-measure the dimensions on other drawings to ensure they meet the requirements. After adjustment, weld temporary process connection plates around the weld seam on site for fixation. 6) Mark the center line of the outer contour in the width direction on the upper and lower surfaces of the tail box girder as the measurement benchmark during trial assembly. Then hoist it to the trial assembly platform and use adjustable shims to support and adjust its flatness so that the deviation between its center line and the cross center line on the slewing base of the bearing beam is ≤1.5mm. At the same time, re-measure other dimensions on the drawings until the requirements are met. After adjustment, weld temporary process connection plates around the weld seam on site for fixation. 7) After all assembly is completed, the overall dimensions are remeasured. If they are qualified, the on-site positioning components are welded in, and after inspection, they are disassembled.

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