In-plant trial assembly assistive device for portal slewing bearing beam of bucket-wheel excavator

Abstract

The utility model discloses an in-plant trial assembly assistive device for a door-shaped rotary bearing beam of a bucket-wheel excavator. The in-plant trial assembly assistive device comprises a pitching reaming coaxial tool and a rotary center coaxial tool. The pitching reaming coaxial tool comprises a transverse center shaft, a side clamping flange and a side baffle, a first middle stand column and a second middle stand column are fixed to the two ends of the transverse center shaft through the side clamping flange and the side baffle, and it is guaranteed that the pitching reaming coaxiality of the material taking arm meets the drawing requirement; the rotation center coaxial tool comprises a vertical center shaft, a top clamping flange, a top baffle and a supporting base, the top of the rotation center coaxial tool fixes a top cross beam to the vertical center shaft through the top clamping flange and the top baffle, and the bottom of the rotation center coaxial tool fixes the vertical center shaft and a bearing beam rotation base together through the supporting base. And the coaxiality of the rotating shaft of the discharging arm to the rotation center meets the drawing requirements. According to the utility model, the product assembly precision can efficiently meet the drawing requirement, each part can be supported and connected, the overall stability of the product is improved, and the safety risk in the production process is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical engineering equipment, and in particular relates to an in-factory trial assembly auxiliary tool for a door-type rotary bearing beam of a bucket wheel excavator. Background Art

[0002] Bucket wheel excavator is a mining equipment. It is used in large open-pit mining of soft or medium hardness due to its high excavation efficiency and wide operating range. It is mainly used for soil stripping, ore mining, ore handling and loading operations. The portal slewing bearing beam is the core bearing component that completes a series of complex actions such as excavation, lifting and unloading. It consists of five parts: top crossbeam, middle column one, middle column two, bearing beam slewing base, tail box beam, etc.; the overall dimensions are 28×18×14.4m. Its structure is complex, welding deformation control is difficult, and the on-site assembly accuracy requirements are high. The on-site weld joint gap is ≤6mm, the misalignment is ≤4mm, the coaxiality of the pitch reaming hole of the material taking arm is ≤2mm, and the coaxiality of the rotating axis of the discharge arm to the rotation center is ≤2.8mm. The flatness and centerline errors of the top crossbeam, bearing beam slewing base, and tail box beam after assembly are ≤1.5mm.

[0003] In order to ensure the above accuracy during on-site assembly, after the manufacture of each component is completed in the factory, the above five major components need to be trial-assembled according to the drawings, and various problems existing in the matching between components need to be found out through trial assembly and corrected. In the past, during trial assembly, the load-bearing beam slewing base was first leveled on the platform according to the drawings, and then the tail box beam, middle column 1, middle column 2, and top crossbeam were assembled with it in sequence with the help of tools such as overhead crane and jack, and the components were fixed by welding temporary process pallets. However, since the blank size is matched between the components during trial assembly, the dimensional tolerance is larger than the two coaxiality tolerances required above. Therefore, in order to ensure that the coaxiality meets the requirements, it is necessary to repeatedly test-assemble the top crossbeam, middle column 1, middle column 2 and load-bearing beam slewing base, install and weld, and remove the temporary fixing pallets, which is time-consuming and laborious; in addition, due to the large size of the part, there are a lot of high-altitude operations during the trial assembly, which is very likely to cause safety accidents. Utility Model Content

[0004] The utility model solves the problems existing in the prior art and provides an auxiliary tool for in-factory trial assembly of a gantry type rotary bearing beam of a bucket wheel excavator, which solves the problems of low efficiency, high cost and great safety hazards in in-factory trial assembly of a gantry type rotary bearing beam of a bucket wheel excavator.

[0005] The utility model is realized by providing a factory test assembly auxiliary tool for a gantry type rotating load-bearing beam of a bucket wheel excavator, comprising a pitch reaming coaxial tool installed between a middle column 1 and a middle column 2, and a rotating center coaxial tool installed between a top cross beam and a rotating base of the load-bearing beam;

[0006] The pitch reaming coaxial tooling comprises a transverse central axis, a side clamping flange, and a side baffle plate. Both ends of the transverse central axis are provided with stoppers respectively. The transverse central axis is fixed at the stopper at one end by means of an inner clamping flange 1, an outer clamping flange 1, and a side baffle plate 1, and is clamped and fixed with a lug of a middle column 1. The transverse central axis is fixed at the stopper at the other end by means of an inner clamping flange 2, an outer clamping flange 2, and a side baffle plate 2, and is clamped and fixed with a lug of a middle column 2.

[0007] The rotating center coaxial tooling includes a vertical center axis, a top clamping flange, a top baffle, and a support base. The top of the vertical center axis is provided with two stoppers, and the bottom is provided with a stopper. The vertical center axis abuts against the lug of the top cross beam at the top lower stopper. The vertical center axis is fixed at the top upper stopper by the top clamping flange, the top baffle and the lug of the top cross beam. The vertical center axis is connected to the support base at the bottom stopper, and the support base is installed on the rotating base of the load-bearing beam.

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

[0009] In the above technical solution, preferably, one side of the inner clamping flange abuts against the stopper at one end of the transverse central axis, and the other side is engaged with one side of the lug of the middle column; the side baffle plate is fixed on the end face of one end of the transverse central axis, and the outer clamping flange is engaged between the transverse central axis and the other side of the lug of the middle column;

[0010] One side of the inner clamping flange is in contact with the stop at the other end of the transverse center axis, and the other side is engaged with one side of the lug of the middle column. The side baffle plate is fixed on the end face of the other end of the transverse center axis, and the outer clamping flange is engaged between the transverse center axis and the other side of the lug of the middle column.

[0011] In the above technical solution, preferably, the inner clamping flange 1, the outer clamping flange 1, the transverse central axis and the middle column 1 are all clearance fits, and the tolerance is less than 0.8mm;

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

[0013] In the above technical solution, preferably, a cross center line is engraved on the side baffle plate 1 and the side baffle plate 2 respectively, which is used as a measurement reference during trial assembly.

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

[0015] The vertical central axis is provided with a fixed support plate at the lower stop of the top, the fixed support plate abuts against one side of the lug of the top cross beam, the top baffle is fixed on the top surface of the vertical central axis, and the top clamping flange is clamped between the vertical central axis and the other side of the lug of the top cross beam;

[0016] The vertical central axis is provided with a fixed baffle at the bottom stop, the bottom of the vertical central axis 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 is clearance-fitted with the vertical center axis and the top cross beam, and the tolerance is less than 0.8 mm.

[0018] In the above technical solution, preferably, the upper and lower outer surfaces of the vertical central axis 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 rib plate located below the panel; a through hole one cooperating with the vertical center axis is provided in the center of the panel, four internal threaded countersunk holes are provided on the panel around the through hole, and a processed surface and through hole two cooperating with the installation of the rotating base of the load-bearing beam are provided on the outer edge of the panel.

[0020] The advantages and positive effects of the utility model are:

[0021] The utility model of the in-factory trial assembly auxiliary tool for the gantry type slewing load-bearing beam of a bucket wheel excavator can not only enable the rapid installation and positioning of various components during the in-factory trial assembly of the gantry type slewing load-bearing beam of the bucket wheel excavator, thereby ensuring that the product assembly accuracy meets the requirements of the drawings, thereby improving production efficiency and reducing the labor intensity of personnel, but also can support and connect various components, thereby improving the overall stability of the product and reducing safety risks in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the installation of the test assembly auxiliary tool of the utility model when it is working;

[0023] Figure 2 It is a cross-sectional view of a pitch reaming coaxial tooling in a trial assembly auxiliary tool of the utility model;

[0024] Figure 3 It is a cross-sectional view of the coaxial tooling of the rotation center in the trial assembly auxiliary tool of the utility model;

[0025] Figure 4 It is a bottom view of the support base in the rotary center coaxial tooling of the utility model.

[0026] In the figure: 1, coaxial tooling for pitch reaming; 1-1, transverse center axis; 1-21, inner clamping flange 1; 1-22, inner clamping flange 2; 1-31, outer clamping flange 1; 1-32, outer clamping flange 2; 1-41, side baffle 1; 1-42, side baffle 2; 1-51, fastener 1; 1-52, fastener 2;

[0027] 2. Rotation center coaxial tooling; 2-1. Vertical center axis; 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;

[0028] 3. Top cross beam; 4. Middle column one; 5. Middle column two; 6. Load-bearing beam slewing base; 7. Tail box beam. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "two", "three", "four", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "connection", "installation" and "fitting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1 to Figure 4An embodiment of the utility model provides an in-factory trial assembly auxiliary tool for a gantry slewing bearing beam of a bucket wheel excavator, comprising: a pitch reaming coaxial tool 1 and a slewing center coaxial tool 2, wherein the pitch reaming coaxial tool 1 is installed between a middle column 1 4 and a middle column 2 5, and the slewing center coaxial tool 2 is installed between a top cross beam 3 and a slewing base 6 of the bearing beam.

[0033] The pitch reaming coaxial tooling 1 comprises a transverse central axis 1-1, a side clamping flange, and a side baffle. The two ends of the transverse central axis 1-1 are provided with stoppers, respectively. The transverse central axis 1-1 is fixed at one end stopper by means of an inner clamping flange 1-21, an outer clamping flange 1-31, and a side baffle 1-41, and is fixed at the other end stopper by means of an inner clamping flange 2 1-22, an outer clamping flange 2 1-32, and a side baffle 2 1-42, and is fixed at the other end stopper by means of an inner clamping flange 2 1-22, an outer clamping flange 2 1-32, and a side baffle 2 1-42, and is fixed at the middle column 2 5. The middle column 1 4 and the middle column 2 5 are fixed at the two ends of the transverse central axis 1-1, thereby ensuring that the coaxiality of the pitch reaming of the material taking arm meets the requirements of the drawing.

[0034] The revolving center coaxial tooling includes a vertical central axis 2-1, a top clamping flange 2-2, a top baffle 2-3, and a support base 2-4. The top of the vertical central axis 2-1 is provided with two stoppers and the bottom is provided with one stopper. The vertical central axis 2-1 abuts against the lug of the top cross beam 3 at the top lower stopper. The vertical central axis 2-1 is fixed at the top upper stopper through the top clamping flange 2-2 and the top baffle 2-3 and the lug of the top cross beam 3. The vertical central axis 2-1 is connected to the support base 2-4 at the bottom stopper, and the support base 2-4 is installed on the bearing beam revolving base 6. The top cross beam 3 and the bearing beam revolving base 6 are installed and fixed at both ends of the vertical central axis 2-1, so as to ensure that the coaxiality of the rotating axis of the discharge arm to the revolving center meets the requirements of the drawings.

[0035] During factory trial assembly, this auxiliary tool can not only ensure that the product assembly accuracy meets the requirements of the drawings, but also support and connect the various components, thereby improving the overall stability of the product and reducing safety risks in the production process.

[0036] As a preferred embodiment, the pitch reaming coaxial tooling includes a transverse central axis 1-1, an inner clamping flange 1-21, an outer clamping flange 1-31, an inner clamping flange 2 1-22, an outer clamping flange 2 1-32, a side baffle 1-41, a side baffle 2 1-42, a fastener 1-51 and a fastener 2 1-52. During operation, the middle column 1-4 and the middle column 2-5 are fixedly mounted at both ends of the transverse central axis 1-1 by the inner clamping flange 1-21, the outer clamping flange 1-31, the inner clamping flange 2 1-22, the outer clamping flange 2 1-32, the side baffle 1-41, the side baffle 2 1-42, the fastener 1-51 and the fastener 2 1-52, so as to ensure that the coaxiality of the pitch reaming of the material taking arm meets the requirements of the drawing.

[0037] The transverse central axis 1-1 is made of steel pipe, which is symmetrical along the length direction; stoppers are respectively arranged at both ends of the transverse central axis 1-1 to fix it with the middle column 1 4, the middle column 2 5 and the side clamping flange; internal threaded countersunk hole 1 and internal threaded countersunk hole 2 are respectively arranged on the end faces of both ends for being bolted together with the side baffle.

[0038] One side of the inner clamping flange 1-21 abuts against the stopper at one end of the transverse central axis 1-1, and the other side is engaged with one side of the lug of the middle column 4; the side baffle 1-41 is fixed on the end face of one end of the transverse central axis 1-1, and the outer clamping flange 1-31 is engaged between the transverse central axis 1-1 and the other side of the lug of the middle column 4. Specifically, an internal threaded countersunk hole 1 is provided on the end face of one end of the transverse central axis 1-1, and the side baffle 1-41 is connected and fixed to the transverse central axis 1-1 through a fastener 1-51.

[0039] One side of the inner clamping flange 1-22 abuts against the stopper at the other end of the transverse central axis 1-1, and the other side is engaged with one side of the lug of the middle column 5; the side baffle 1-42 is fixed on the other end face of the transverse central axis 1-1, and the outer clamping flange 1-32 is engaged between the transverse central axis 1-1 and the other side of the lug of the middle column 5. Specifically, an internal threaded countersunk hole 2 is provided on the other end face of the transverse central axis 1-1, and the side baffle 1-42 is connected and fixed to the transverse central axis 1-1 through a fastener 1-52.

[0040] As a preferred embodiment, the inner clamping flange 1-21, the outer clamping flange 1-31, the transverse center axis 1-1 and the middle column 4 are all clearance fits, and the tolerances are all less than 0.8mm; the inner clamping flange 1-22, the outer clamping flange 1-32, the transverse center axis 1-1 and the middle column 5 are all clearance fits, and the tolerances are all less than 0.8mm.

[0041] As a preferred embodiment, the side baffle 1 1 - 41 and the side baffle 2 1 - 42 are respectively engraved with a cross center line, which is used as a measurement reference during trial assembly.

[0042] As a preferred embodiment, the rotation center coaxial tooling 2 comprises a vertical center axis 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, a fastener three 2-51, a fastener four 2-52 and a fastener five 2-53. When working, the top crossbeam 3 is fixed on the vertical center axis 2-1 through the fixed support plate 2-11, the top clamping flange 2-2, the top baffle 2-3 and the fastener three 2-51, and the bottom is connected and fixed with the vertical center axis 2-1 and the bearing beam rotation base 6 through the fixed baffle 2-12, the support base 2-4, the fastener four 2-52 and the fastener five, so as to ensure that the coaxiality of the discharge arm rotation axis to the rotation center meets the requirements of the drawings.

[0043] The vertical center axis 2-1 is welded by steel pipes of different diameters, with small diameter steel pipes being used at the upper part and large diameter steel pipes being used at the lower part; two stoppers are arranged at the top of the vertical center axis 2-1 and one stopper is arranged at the bottom; a fixed support plate 2-11 is welded at the lower stopper on the top of the vertical center axis 2-1, and a fixed baffle 2-12 is welded at the bottom stopper on the vertical center axis 2-1; the fixed support plate 2-11 and the fixed baffle 2-12 are steel plates of different diameters welded on the vertical center axis 2-1, and the fixed baffle 2-12 at the bottom is used to be fixed together with the support base 2-4; three internal threaded countersunk holes are arranged on the top surface of the vertical center axis 2-1, which are used to be fixed together with the top baffle 2-3 by bolts.

[0044] The fixed support plate 2-11 abuts against one side of the lug of the top cross beam 3, and the top baffle plate 2-3 is fixed on the top end surface of the vertical center axis 2-1, and the top clamping flange 2-2 is clamped between the vertical center axis 2-1 and the other side of the lug of the top cross beam 3; specifically, an internal threaded countersunk hole three is provided on the top end surface of the vertical center axis 2-1, and the top baffle plate 2-3 is connected and fixed to the vertical center axis 2-1 by a fastener three 2-51.

[0045] The bottom of the vertical central axis 2-1 is embedded in the support base 2-4 and is connected and fixed to the support base 2-4 through a fixed baffle 2-12. Specifically, an internal threaded countersunk hole 4 is provided on the top surface of the inner side of the support base 2-4, and the fixed baffle 2-12 is connected and fixed to the support base 2-4 through a fastener 4 2-52.

[0046] The top clamping flange 2-2 is clearance-fitted with the vertical center axis 2-1 and the top crossbeam 33, and the tolerance is less than 0.8 mm.

[0047] The upper and lower outer surfaces of the vertical central axis 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 central axis, and steel wires are hung on them to measure the verticality of the vertical central axis.

[0048] As a preferred embodiment, the support base 2-4 is formed by welding a panel 2-4-1 and a cross rib plate 2-4-2 located below the panel 2-4-1; a through hole 1 is provided in the center of the panel 2-4-1 to match the vertical center axis 2-1, and internal threaded countersunk holes 4 are provided on the panel 2-4-1 around the through hole, and a processing surface and a through hole 2 are provided on the outer edge of the panel 2-4-1 to match the bearing beam swivel base 6. Specifically, the panel 2-4-1 is connected and fixed to the bearing beam swivel base 6 by a fastener 5 2-53.

[0049] The above-mentioned fastener 1-51, fastener 2-52, fastener 3-51, fastener 4-52, and fastener 5-53 all use bolts and spring washers.

[0050] The method for in-factory trial installation of a portal-type rotary bearing beam of a bucket wheel excavator based on the above trial installation auxiliary tool comprises the following steps:

[0051] 1) Assemble the test platform. Connect multiple platforms together to form the test platform. Make the size of the test platform larger than the outer contour of the support point after the bearing beam slewing base 6 and the tail box beam 7 are connected. Adjust the test platform so that the flatness is ≤1.5mm;

[0052] 2) On the upper surface of the load beam slewing base 6, a cross centerline is engraved along the length and width direction with the slewing center as the base point, which is used as the measurement reference during the test assembly. Then, it is hoisted to the test assembly platform, and the load beam slewing base 6 is supported by 8 shims, and its flatness is adjusted by 4 jacks. The flatness of the machined surfaces of the upper and lower large flanges inside the slewing center relative to the test assembly platform is measured by a level meter to be ≤1.5mm;

[0053] 3) Use the pitch reaming coaxial tooling 1 in the above-mentioned trial assembly auxiliary tool to connect the middle column 1 4 and the middle column 2 5 together, and weld two process tie bars on the sides of the middle column 1 4 and the middle column 2 5 away from the pitch reaming coaxial tooling 1 to strengthen and fix the middle column 1 4 and the middle column 2 5;

[0054] 4) Lift the assembled two middle columns to the top of the load beam slewing base 6 for trial installation. Take the cross center line on the side baffle 1-41 and the side baffle 2-1-42 and the cross center line on the load beam slewing base 6 as the reference, use steel wire and level to measure, ensure that the center axis of the pitch reaming coaxial tooling 1 is horizontal with respect to the upper and lower large flange processing surfaces inside the slewing center of the load beam slewing base 6, and the horizontal distance with the cross center line on the load beam slewing base 6 is 1150±1. 5mm; at the same time, re-measure the coaxiality of the pitch reaming holes of the middle column 1 4 and the middle column 2 5, the flatness of the upper and lower large flange processing surfaces inside the rotation center of the load-bearing beam rotating base 6 relative to the test installation platform, and other drawing dimensions. If necessary, the on-site welding grooves need to be trimmed until the gap and misalignment requirements are met; after adjustment, a temporary process connection plate is welded around the on-site weld to fix it, and process tie bars are welded between the middle column 1 4, the middle column 2 5 and the load-bearing beam rotating base 6 to enhance safety and stability;

[0055] 5) Assemble the coaxial tooling 2 of the slewing center in the above-mentioned test assembly auxiliary tool and the slewing base 6 of the load-bearing beam firmly, and test the top cross beam 3 together with the middle column 1 4 and the middle column 2 5 as the basis. First, install the top cross beam 3 on the coaxial tooling 2 of the slewing center to ensure the coaxiality, and then test the top cross beam 3. Take the reference plane on the vertical center axis 2-1 and the cross center line on the slewing base 6 of the load-bearing beam as the reference, use steel wire and level to measure, ensure the verticality of the vertical center axis 2-1 and the horizontal distance between the center of the horizontal center axis 1-1 and the center of the vertical center axis 2-1 is 1150±1.5mm, and re-measure other drawing dimensions to meet the requirements. If necessary, the on-site weld groove needs to be trimmed until it meets the relevant requirements such as gap and misalignment; after adjustment, weld a temporary process connection plate around the on-site weld to fix it;

[0056] 6) The center line of the outer contour in the width direction is engraved on the upper and lower surfaces of the tail box beam 7, which is used as the measurement reference during the trial assembly. After that, it is hoisted to the trial assembly platform and its flatness is adjusted with 4 adjustable shims so that the deviation between its center line and the cross center line on the load-bearing beam slewing base 6 is ≤1.5mm; at the same time, other drawing dimensions are re-measured, and if necessary, the on-site weld groove is trimmed until the gap and misalignment requirements are met; after adjustment, a temporary process connection plate is welded around the on-site weld to fix it;

[0057] 7) After all the assemblies are completed, the overall dimensions will be re-measured. If qualified, the on-site positioning components will be welded and disassembled after passing the inspection.

[0058] The utility model of the in-factory trial assembly auxiliary tool for the gantry type slewing load-bearing beam of a bucket wheel excavator can not only enable the rapid installation and positioning of various components during the in-factory trial assembly of the gantry type slewing load-bearing beam of the bucket wheel excavator, thereby ensuring that the product assembly accuracy meets the requirements of the drawings, thereby improving production efficiency and reducing the labor intensity of personnel, but also can support and connect various components, thereby improving the overall stability of the product and reducing safety risks in the production process.

[0059] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A factory test-assembly auxiliary tool for a gantry-type rotary bearing beam of a bucket wheel excavator, characterized in that: It includes a pitch reaming coaxial tool installed between the middle column 1 and the middle column 2, and a slewing center coaxial tool installed between the top crossbeam and the slewing base of the load-bearing beam; The pitch reaming coaxial tooling comprises a transverse central axis, a side clamping flange, and a side baffle plate. Both ends of the transverse central axis are provided with stoppers respectively. The transverse central axis is fixed at the stopper at one end by means of an inner clamping flange 1, an outer clamping flange 1, and a side baffle plate 1, and is clamped and fixed with a lug of a middle column 1. The transverse central axis is fixed at the stopper at the other end by means of an inner clamping flange 2, an outer clamping flange 2, and a side baffle plate 2, and is clamped and fixed with a lug of a middle column 2. The rotating center coaxial tooling includes a vertical center axis, a top clamping flange, a top baffle, and a support base. The top of the vertical center axis is provided with two stoppers, and the bottom is provided with a stopper. The vertical center axis abuts against the lug of the top cross beam at the top lower stopper. The vertical center axis is fixed at the top upper stopper by the top clamping flange, the top baffle and the lug of the top cross beam. The vertical center axis is connected to the support base at the bottom stopper, and the support base is installed on the rotating base of the load-bearing beam.

2. The in-factory test assembly auxiliary tool for the portal-type rotary load-bearing beam of a bucket wheel excavator according to claim 1 is characterized in that: The transverse central axis is made of a steel pipe, and is bilaterally symmetrical along the length direction.

3. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1 is characterized in that: One side of the inner clamping flange abuts against the stopper at one end of the transverse central axis, and the other side is engaged with one side of the lug of the middle column; the side baffle plate is fixed on the end surface of one end of the transverse central axis, and the outer clamping flange is engaged between the transverse central axis and the other side of the lug of the middle column; One side of the inner clamping flange is in contact with the stop at the other end of the transverse center axis, and the other side is engaged with one side of the lug of the middle column. The side baffle plate is fixed on the end face of the other end of the transverse center axis, and the outer clamping flange is engaged between the transverse center axis and the other side of the lug of the middle column.

4. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1 is characterized in that: The inner clamping flange 1, the outer clamping flange 1, the transverse central axis and the middle column 1 are all clearance-fitted, and the tolerance is less than 0.8mm; The inner clamping flange 2, the outer clamping flange 2, the transverse central axis and the middle column 2 are all clearance-fitted, and the tolerances are all less than 0.8 mm.

5. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1 is characterized in that: The side baffle plate 1 and the side baffle plate 2 are respectively engraved with a cross center line, which is used as a measurement reference during trial assembly.

6. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1, characterized in that: The vertical central axis is welded from steel pipes of different diameters; The vertical central axis is provided with a fixed support plate at the lower stop of the top, the fixed support plate abuts against one side of the lug of the top cross beam, the top baffle is fixed on the top surface of the vertical central axis, and the top clamping flange is clamped between the vertical central axis and the other side of the lug of the top cross beam; The vertical central axis is provided with a fixed baffle at the bottom stop, the bottom of the vertical central axis is embedded in the support base, and is connected and fixed to the support base through the fixed baffle.

7. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1 is characterized in that: The top clamping flange is clearance-fitted with the vertical center axis and the top crossbeam, and the tolerance is less than 0.8 mm.

8. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1, characterized in that: The upper and lower outer surfaces of the vertical central axis are respectively provided with machined reference surfaces, which are used as measurement references during trial assembly.

9. The in-factory test assembly auxiliary tool for the portal type rotary load-bearing beam of a bucket wheel excavator according to claim 1, characterized in that: The support base is formed by welding a panel and a rib plate located below the panel; a through hole one cooperating with the vertical center axis is provided in the center of the panel, four internal threaded countersunk holes are provided on the panel around the through hole, and a processed surface and through hole two cooperating with the installation of the rotating base of the load-bearing beam are provided on the outer edge of the panel.

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