An assembly method for a slewing device of a crane

Abstract

An assembly method for a slewing device of a crane, the slewing device comprising a turntable main structure, a turntable A-frame, a turntable flange, a base flange, a base and a segmented slewing bearing; the assembly method comprising the following steps: 1. Connect the turntable main structure and the turntable flange; 2. Set up a leveling tooling to adjust the turntable flange to be parallel to the horizontal plane; 3. Machine the mounting surface of the turntable flange so that its flatness geometric tolerance meets the installation requirements; 4. Assemble the segmented slewing bearing onto the turntable flange; 5. Flip the turntable main structure, the turntable flange and the segmented slewing bearing as a whole, and weld the turntable A-frame onto the turntable flange; 6. Connect the base flange and the base; 7. Assemble the turntable main structure, the turntable A-frame, the turntable flange and the segmented slewing bearing as a whole onto the base flange to complete the assembly work. This design not only saves manpower and material resources, but also can improve production efficiency.

Description

Technical Field

[0001] The present invention relates to a slewing device, belonging to the field of hoisting machinery, and particularly to an assembly method for a crane slewing device. Background Art

[0002] In recent years, with the booming of the offshore wind power market, large wind power installation cranes are key equipment for offshore construction platforms, and the safe working load is at least over 1200 tons, that is, the safe working load capacity of the crane is getting larger and larger. The slewing bearing is an important load-bearing component in the crane. While bearing the working load of the whole machine, it also needs to participate in realizing the overall slewing of the crane; due to factors such as domestic road transportation and large forging manufacturing, the load capacity of the integral slewing bearing is difficult to meet the bearing requirements of the crane, and the segmented slewing bearing has become an inevitable choice for large cranes.

[0003] In the invention patent with the application number 201710501941.7 and the name of an installation tooling and installation method for a slewing bearing, an installation tooling and installation method for a slewing bearing are disclosed. The installation tooling has a hoisting member and multiple guide rods. Multiple support rods extend radially outward along the middle of the hoisting shaft. One end of each support rod far from the hoisting shaft is provided with a connecting plate, and multiple through holes are provided on each connecting plate; during installation, the through holes need to be aligned and the installation rods need to be inserted into the installation holes. After installation, this hoisting member needs to be disassembled to install the slewing bearing in place. During this process, manual assistance is required to align the through holes, and this installation workpiece can only adapt to this slewing bearing, resulting in certain material waste;

[0004] Although the crane slewing device can meet the transportation requirements through disassembly, after being transported to the crane assembly site, the slewing device needs to be reassembled into a whole again. The on-site reassembly includes two important processes: assembly and hoisting installation. There are also the following defects in the on-site assembly process of the crane slewing device:

[0005] The assembly of the crane slewing device requires a special assembly tooling, and also requires a large number of auxiliary toolings and auxiliary workers; after being assembled into a whole, a special hoisting tooling is needed for hoisting again. After the installation process, the assembly tooling and the hoisting tooling also need to be disassembled, and the assembly tooling and the hoisting tooling can basically not be reused, resulting in a large waste of manpower and material resources and affecting production efficiency.

[0006] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The object of the present invention is to overcome the defects and problems in the prior art that there is a large waste of manpower and material resources in the assembly of the crane slewing device and it affects the production efficiency, and to provide an assembly method of a crane slewing device that saves manpower and material resources and improves the production efficiency.

[0008] To achieve the above object, the technical solution of the present invention is: an assembly method of a crane slewing device, the slewing device includes a turntable main structure, a turntable herringbone frame, a turntable flange, a base flange, a base and a segmented slewing bearing;

[0009] The segmented slewing bearing includes a race ring and a seat ring, the race ring includes a race ring A surface and a race ring B surface that are parallel to each other, and the seat ring includes a seat ring A surface and a seat ring B surface that are parallel to each other;

[0010] The race ring includes a plurality of arc-shaped race ring segments that are connected end to end in sequence, and the seat ring includes a plurality of arc-shaped seat ring segments that are connected end to end in sequence;

[0011] The assembly method includes the following steps:

[0012] Step 1: Connect the turntable main structure and the turntable flange. After connection, the turntable A surface in the turntable main structure is in contact with the turntable flange A surface in the turntable flange;

[0013] Step 2: A convex block is provided on one side below the turntable B surface in the turntable main structure, and a leveling tooling is provided on the other side below the turntable B surface. Taking the convex block as a fulcrum, by adjusting the height of the leveling tooling, the angle between the turntable flange B surface in the turntable flange and the horizontal plane is adjusted until the turntable flange B surface is parallel to the horizontal plane;

[0014] Step 3: Machine the turntable flange B surface until its flatness geometric tolerance meets the installation requirements;

[0015] Step 4: Place the arc-shaped race ring segments on the turntable flange B surface to assemble into a race ring. At this time, the race ring A surface is in contact with the turntable flange B surface; then assemble the arc-shaped seat ring segments on the race ring. At this time, the seat ring B surface and the race ring B surface are on the same horizontal plane and the height difference between the seat ring A surface and the race ring A surface meets the requirements; finally, connect the segmented slewing bearing and the turntable flange;

[0016] Step 5: Flip the turntable main structure, the turntable flange and the segmented slewing bearing as a whole by [X] degrees. After flipping, the bearing B surface in the segmented slewing bearing faces downward, and then connect the turntable herringbone frame on the turntable B surface;

[0017] Step 6: Connect the base flange and the base. After connection, the base flange B surface in the base flange is in contact with the base A surface in the base;

[0018] Step 7: Assemble the main turntable structure, the turntable herringbone frame, the turntable flange, the segmented slewing bearing and the base flange. At this time, the B surface of the bearing is in contact with the A surface of the base flange of the base flange, and then connect the segmented slewing bearing with the base flange to complete the assembly of the slewing device.

[0019] The main turntable structure includes a turntable A surface and a turntable B surface that are parallel to each other. The turntable flange includes a turntable flange A surface and a turntable flange B surface that are parallel to each other; the segmented slewing bearing includes a bearing A surface and a bearing B surface that are parallel to each other; the base flange includes a base flange A surface and a base flange B surface that are parallel to each other; the base includes a base A surface and a base B surface that are parallel to each other;

[0020] In the above Step 7, the assembled state of the slewing device means that: the turntable A surface is in contact with the turntable flange A surface, the turntable flange B surface is in contact with the bearing A surface, the bearing B surface is in contact with the base flange A surface, and the base flange B surface is in contact with the base A surface.

[0021] A number of ring perforations are circumferentially arranged along the axis of the ring. A number of turntable flange perforations are arranged on the turntable flange to match the number of ring perforations;

[0022] A first bolt is inserted through the ring perforation and the turntable flange perforation. Tighten the first bolt, which is the connection between the segmented slewing bearing and the turntable flange in the above Step 4.

[0023] A number of seat ring perforations are circumferentially arranged along the axis of the seat ring. A number of base flange perforations are arranged on the base flange to match the number of seat ring perforations;

[0024] A second bolt is inserted through the seat ring perforation and the base flange perforation. Tighten the second bolt, which is the connection between the segmented slewing bearing and the base flange in the above Step 7.

[0025] One end of the segmented arc-shaped ring forms a lower stop interface, and the other end forms an upper stop interface; a threaded counterbore is formed on the lower stop interface, and a threaded through hole is formed on the upper stop interface. The threaded counterbore and the threaded through hole are connected by a third bolt; adjacent lower stop interfaces and upper stop interfaces overlap each other to form a ring-shaped ring.

[0026] External gear teeth are arranged on the outer arc surface of the seat ring. A slewing reducer is arranged on the main turntable structure. The slewing reducer includes a slewing gear, a cantilever arm, and a gear shaft. The lower part of the cantilever arm is connected with a slewing gear through a gear shaft, and the slewing gear is coupled with the external gear teeth;

[0027] The upper tooth surface of the slewing gear is parallel to the cantilever surface of the cantilever beam and is spaced apart by a certain distance to form a spacing difference H; the surface A of the ferrule is parallel to the surface A of the seat ring and has a height difference H with a certain height difference, and the spacing difference H is consistent with the height difference H.

[0028] Both the spacing difference H1 and the height difference H are: 100 mm to 150 mm.

[0029] In the second step, the leveling tooling is: cushion blocks, sleepers or hydraulic lifting devices.

[0030] In the third step, the installation requirement of the B surface of the turntable flange is: the flatness geometric tolerance ≤ 0.5 mm.

[0031] The locking target of the first bolt in the fourth step and the second bolt in the seventh step is: apply the corresponding torque according to the bolt specification.

[0032] In the seventh step, the assembly of the segmented slewing bearing and the base flange means: hoisting the main structure of the turntable, the turntable herringbone frame, the turntable flange and the segmented slewing bearing as a whole onto the base flange, so that the B surface of the bearing is in contact with the A surface of the base flange and the B surface of the bearing is parallel to the A surface of the base flange.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. In the assembly method of a crane slewing device of the present invention, the main structure of the turntable and the turntable flange of the crane itself are used as assembly tooling, and the flatness geometric tolerance of the installation surface of the turntable flange is processed to the flatness requirement required for forming. Subsequently, the segmented slewing bearing is installed on the turntable flange, and then the whole is turned over, the herringbone frame is welded and then docked with the base flange, thereby completing the installation; during this installation process, since the flatness of the turntable flange can meet the installation requirements of the segmented slewing bearing after processing, it matches the segmented slewing bearing after processing, and there is no need to level or adjust repeatedly during installation, and the installation can be completed quickly, and there is no need for additional splicing tooling and hoisting tooling, improving the production efficiency. Therefore, the present invention not only saves manpower and material resources, but also improves the production efficiency.

[0035] 2. In an assembly method of a crane slewing device of the present invention, the turntable flange surface B is processed until its flatness and position tolerance meet the installation requirements. This surface is the installation surface of the segmented slewing bearing, and the flatness of this surface directly affects the slewing effect of the segmented slewing bearing. In application, first, the turntable flange surface B is facing upward, which is convenient for processing. After the processing is completed, this surface also serves as an installation tool, and no additional customized installation tool is required. After the segmented slewing bearing is installed, the turntable main structure, turntable flange and segmented slewing bearing are flipped, and then the turntable herringbone frame is connected to the turntable surface B, and the overall hoisting is connected to the base flange. This whole serves as a hoisting tool, and no additional customized hoisting tool is required, which saves manpower and material resources. In addition, the assembly process is the installation process, and there is no need for cumbersome steps to disassemble the tool, which improves production efficiency. Therefore, the present invention not only saves manpower and material resources, but also improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention.

[0037] Figure 2 It is an exploded structural diagram of the present invention.

[0038] Figure 3 It is a schematic diagram of the relative positions of the turntable main structure, turntable flange and segmented slewing bearing in steps 1 to 4 of the present invention.

[0039] Figure 4 It is a structural schematic diagram of the segmented slewing bearing in the present invention.

[0040] Figure 5 It is a structural schematic diagram of the ferrule in the present invention.

[0041] Figure 6 It is a schematic diagram of the relative positions of the slewing reducer and the segmented slewing bearing in the present invention.

[0042] Figure 7 The present invention Figure 6 An enlarged schematic diagram of a local Y.

[0043] Figure 8 The present invention Figure 6 A magnified schematic diagram of the local Z.

[0044] Figure 9 It is a top view of the seat ring and the ferrule in the present invention.

[0045] Figure 10 The present invention Figure 2 An enlarged schematic diagram of local A.

[0046] In the figure: Turntable main structure 1, turntable A surface 101, turntable B surface 102, leveling tooling 103, bump 104, turntable herringbone frame 2, turntable flange 3, turntable flange A surface 301, turntable flange B surface 302, turntable flange perforation 303, base flange 4, base flange A surface 401, base flange B surface 402, base flange perforation 403, base 5, base A surface 501, base B surface 502, slewing reducer 6, slewing gear 61, upper tooth surface 62, cantilever 63, cantilever surface 64, gear shaft 65, segmented slewing bearing 7, bearing A surface 701, bearing B surface 702, first bolt 703, second bolt 704, outer ring 705, inner ring 706, outer ring perforation 707, inner ring perforation 708, external gear teeth 709, arc-shaped outer ring segment 710, lower stop interface 711, upper stop interface 712, threaded counterbore 713, threaded through-hole 714, groove 715, outer ring A surface 716, outer ring B surface 717, inner ring A surface 718, inner ring B surface 719, third bolt 720, arc-shaped inner ring segment 721. Detailed implementation mode

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0048] See Figure 1 — Figure 10 , an assembly method for a crane slewing device, the slewing device comprising a turntable main structure 1, a turntable herringbone frame 2, a turntable flange 3, a base flange 4, a base 5 and a segmented slewing bearing 7;

[0049] The segmented slewing bearing 7 comprises an outer ring 705 and an inner ring 706, the outer ring 705 comprises an outer ring A surface 716 and an outer ring B surface 717 that are parallel to each other, and the inner ring 706 comprises an inner ring A surface 718 and an inner ring B surface 719 that are parallel to each other;

[0050] The outer ring 705 comprises a plurality of arc-shaped outer ring segments 710 connected end to end in sequence, and the inner ring 706 comprises a plurality of arc-shaped inner ring segments 721 connected end to end in sequence;

[0051] The assembly method comprises the following steps:

[0052] Step 1: Connect the turntable main structure 1 and the turntable flange 3. After connection, the turntable A surface 101 in the turntable main structure 1 is in contact with the turntable flange A surface 301 in the turntable flange 3;

[0053] Step 2: A convex block 104 is provided on one side below the B surface 102 of the turntable in the main structure 1 of the turntable, and a leveling tool 103 is provided on the other side below the B surface 102 of the turntable. Taking the convex block 104 as a fulcrum, by adjusting the height of the leveling tool 103, the included angle between the B surface 302 of the turntable flange in the turntable flange 3 and the horizontal plane is adjusted until the B surface 302 of the turntable flange is parallel to the horizontal plane;

[0054] Step 3: Machine the B surface 302 of the turntable flange until the form and position tolerance of its flatness meets the installation requirements;

[0055] Step 4: Place the segmented arc-shaped ring 710 on the B surface 302 of the turntable flange and assemble it into a ring 705. At this time, the A surface 716 of the ring is in contact with the B surface 302 of the turntable flange; then assemble the segmented arc-shaped seat ring 721 on the ring 705. At this time, the B surface 719 of the seat ring and the B surface 717 of the ring are on the same horizontal plane and the height difference between the A surface 718 of the seat ring and the A surface 716 of the ring meets the requirements; finally, connect the segmented slewing bearing 7 to the turntable flange 3;

[0056] Step 5: Flip the main structure 1 of the turntable, the turntable flange 3 and the segmented slewing bearing 7 as a whole by 180 degrees. After flipping, the bearing B surface 702 in the segmented slewing bearing 7 faces downward, and then connect the turntable herringbone frame 2 to the B surface 102 of the turntable;

[0057] Step 6: Connect the base flange 4 to the base 5. After connection, the B surface 402 of the base flange in the base flange 4 is in contact with the A surface 501 of the base in the base 5;

[0058] Step 7: Assemble the main structure 1 of the turntable, the turntable herringbone frame 2, the turntable flange 3, the segmented slewing bearing 7 and the base flange 4. At this time, the bearing B surface 702 is in contact with the A surface 401 of the base flange of the base flange 4, and then connect the segmented slewing bearing 7 to the base flange 4 to complete the assembly of the slewing device.

[0059] The main structure 1 of the turntable includes a turntable A surface 101 and a turntable B surface 102 that are parallel to each other. The turntable flange 3 includes a turntable flange A surface 301 and a turntable flange B surface 302 that are parallel to each other; the segmented slewing bearing 7 includes a bearing A surface 701 and a bearing B surface 702 that are parallel to each other; the base flange 4 includes a base flange A surface 401 and a base flange B surface 402 that are parallel to each other; the base 5 includes a base A surface 501 and a base B surface 502 that are parallel to each other;

[0060] In Step 7, the assembled state of the slewing device means that: the A surface 101 of the turntable is in contact with the A surface 301 of the turntable flange, the B surface 302 of the turntable flange is in contact with the A surface 701 of the support, the B surface 702 of the support is in contact with the A surface 401 of the base flange, and the B surface 402 of the base flange is in contact with the A surface 501 of the base.

[0061] A plurality of raceway perforations 707 are circumferentially arranged along the axis of the raceway 705, and a plurality of turntable flange perforations 303 are arranged on the turntable flange 3 to match the plurality of raceway perforations 707;

[0062] A first bolt 703 is inserted through the raceway perforation 707 and the turntable flange perforation 303. After tightening the first bolt 703, it is the connection between the segmented slewing bearing 7 and the turntable flange 3 in Step 4.

[0063] A plurality of seat ring perforations 708 are circumferentially arranged along the axis of the seat ring 706, and a plurality of base flange perforations 403 are arranged on the base flange 4 to match the plurality of seat ring perforations 708;

[0064] A second bolt 704 is inserted through the seat ring perforation 708 and the base flange perforation 403. After tightening the second bolt 704, it is the connection between the segmented slewing bearing 7 and the base flange 4 in Step 7.

[0065] One end of the arc-shaped raceway segment 710 forms a lower stop interface 711, and the other end forms an upper stop interface 712; a threaded counterbore 713 is formed on the lower stop interface 711, a threaded through hole 714 is formed on the upper stop interface 712, and the threaded counterbore 713 and the threaded through hole 714 are connected by a third bolt 720; adjacent lower stop interfaces 711 and upper stop interfaces 712 overlap each other to form a ring-shaped raceway 705.

[0066] External gear teeth 709 are arranged on the outer arc surface of the seat ring 706, a slewing reducer 6 is arranged on the main structure 1 of the turntable, the slewing reducer 6 includes a slewing gear 61, a cantilever 63, and a gear shaft 65. The lower part of the cantilever 63 is connected with a slewing gear 61 through a gear shaft 65, and the slewing gear 61 is coupled with the external gear teeth 709;

[0067] The upper tooth surface 62 of the slewing gear 61 and the cantilever surface 64 of the cantilever 63 are parallel to each other and have a spacing difference H1 at a certain distance; the A surface 716 of the raceway and the A surface 718 of the seat ring are parallel to each other and have a height difference H at a certain height, and the spacing difference H1 is consistent with the height difference H.

[0068] Both the spacing difference H1 and the height difference H are: 100 mm to 150 mm.

[0069] In the second step, the leveling tooling 103 is: a cushion block, a sleeper or a hydraulic lifting device.

[0070] In the third step, the installation requirement for the B surface 302 of the turntable flange is: the flatness geometric tolerance ≤ 0.5 mm.

[0071] The tightening target of the first bolt 703 in the fourth step and the second bolt 704 in the seventh step is: apply the corresponding torque according to the bolt specification.

[0072] In the seventh step, the assembly of the segmented slewing bearing 7 and the base flange 4 means: hoisting the turntable main structure 1, the turntable lattice boom 2, the turntable flange 3 and the segmented slewing bearing 7 as a whole onto the base flange 4, so that the bearing B surface 702 is in contact with the base flange A surface 401 and the bearing B surface 702 is parallel to the base flange A surface.

[0073] The principle of the present invention is described as follows:

[0074] In an assembly method of a crane slewing device, the bearing A surface 701 of the segmented slewing bearing must face downward, that is, toward the turntable flange. Before flipping, the ring A surface 716 and the seat ring A surface 718 face downward and are parallel to each other and form a height difference H, and the height difference H is below, and the ring B surface 717 and the seat ring B surface 719 are on the same horizontal line; after flipping, the ring A surface 716 and the seat ring A surface 718 face upward, and the height difference H is above, so that the height difference H can be consistent with H1 and will not affect the load transfer between the slewing gear 61 and the external teeth 709.

[0075] Embodiment 1:

[0076] See Figure 1 — Figure 10 , an assembly method of a crane slewing device, the slewing device includes a turntable main structure 1, a turntable lattice boom 2, a turntable flange 3, a base flange 4, a base 5 and a segmented slewing bearing 7; the segmented slewing bearing 7 includes a ring 705 and a seat ring 706, the ring 705 includes a ring A surface 716 and a ring B surface 717 that are parallel to each other, the seat ring 706 includes a seat ring A surface 718 and a seat ring B surface 719 that are parallel to each other; the ring 705 includes a plurality of arc-shaped ring segments 710 connected end to end in sequence, and the seat ring 706 includes a plurality of arc-shaped seat ring segments 721 connected end to end in sequence;

[0077] The assembly method includes the following steps:

[0078] Step 1: Connect the turntable main structure 1 and the turntable flange 3. After connection, the turntable A surface 101 in the turntable main structure 1 is in contact with the turntable flange A surface 301 in the turntable flange 3. The preferred connection method is welding;

[0079] Step 2: A convex block 104 is provided on one side below the B surface 102 of the turntable in the main turntable structure 1, and a leveling tool 103 is provided on the other side below the B surface 102 of the turntable. Taking the convex block 104 as a fulcrum, by adjusting the height of the leveling tool 103, the included angle between the B surface 302 of the turntable flange in the turntable flange 3 and the horizontal plane is adjusted until the B surface 302 of the turntable flange is parallel to the horizontal plane. Preferably, the leveling tool 103 is a sleeper;

[0080] Step 3: Machine the B surface 302 of the turntable flange until its flatness geometric tolerance meets the installation requirements. Preferably, the flatness geometric tolerance is ≤0.5 mm;

[0081] Step 4: Place the segmented arc-shaped ring 710 on the B surface 302 of the turntable flange and assemble it into a ring 705. At this time, the A surface 716 of the ring is in contact with the B surface 302 of the turntable flange; then assemble the segmented arc-shaped seat ring 721 on the ring 705. At this time, the B surface 719 of the seat ring and the B surface 717 of the ring are on the same horizontal plane and the height difference between the A surface 718 of the seat ring and the A surface 716 of the ring meets the requirements; finally, connect the segmented slewing bearing 7 to the turntable flange 3;

[0082] Step 5: Flip the main turntable structure 1, the turntable flange 3 and the segmented slewing bearing 7 as a whole by 180 degrees. After flipping, the bearing B surface 702 in the segmented slewing bearing 7 faces downward, and then connect the turntable herringbone frame 2 to the B surface 102 of the turntable. Preferably, the connection method is welding;

[0083] Step 6: Connect the base flange 4 to the base 5. After connection, the B surface 402 of the base flange in the base flange 4 is in contact with the A surface 501 of the base in the base 5;

[0084] Step 7: Assemble the main turntable structure 1, the turntable herringbone frame 2, the turntable flange 3, the segmented slewing bearing 7 and the base flange 4. At this time, the bearing B surface 702 is in contact with the A surface 401 of the base flange of the base flange 4, and then connect the segmented slewing bearing 7 to the base flange 4 to complete the assembly of the slewing device.

[0085] Example 2:

[0086] The basic content is the same as that of Example 1, the difference is:

[0087] A plurality of raceway perforations 707 are circumferentially arranged along the axis of the raceway 705, and a plurality of turntable flange perforations 303 are arranged on the turntable flange 3 to match the plurality of raceway perforations 707; a first bolt 703 is inserted through the raceway perforations 707 and the turntable flange perforations 303, and the first bolt 703 is tightened to complete the connection between the segmented slewing bearing 7 and the turntable flange 3 in step four; a plurality of seat ring perforations 708 are circumferentially arranged along the axis of the seat ring 706, and a plurality of base flange perforations 403 are arranged on the base flange 4 to match the plurality of seat ring perforations 708; a second bolt 704 is inserted through the seat ring perforations 708 and the base flange perforations 403, and the second bolt 704 is tightened to complete the connection between the segmented slewing bearing 7 and the base flange 4 in step seven; one end of the arc-shaped raceway segment 710 forms a lower stop interface 711, and the other end forms an upper stop interface 712; a threaded counterbore 713 is formed on the lower stop interface 711, and a threaded through hole 714 is formed on the upper stop interface 712, and the threaded counterbore 713 and the threaded through hole 714 are connected by a third bolt 720; adjacent lower stop interfaces 711 and upper stop interfaces 712 are overlapped with each other to form a ring-shaped raceway 705.

[0088] In application, the assembly method includes the following steps:

[0089] Step one: Weld the turntable flange 3 to the turntable main structure. At this time, the turntable A surface 101 in the turntable main structure 1 is in contact with the turntable flange A surface 301 in the turntable flange 3.

[0090] Step two: A convex block 104 is arranged on one side below the turntable B surface 102 in the turntable main structure 1. The convex block 104 is the self-structure of the turntable main structure 1 and is used as a fulcrum. A leveling tool 103 is arranged on the other side below the turntable B surface 102. Preferably, the leveling tool 103 is a sleeper. By increasing or decreasing the height of the sleeper, the angle between the turntable flange B surface 302 in the turntable flange 3 and the horizontal plane is adjusted until the turntable flange B surface 302 is parallel to the horizontal plane.

[0091] Step three: Process the turntable flange B surface 302. Preferably, the processing method is grinding, and the flatness geometric tolerance is processed to be ≤0.5 mm.

[0092] Step 4: Place the segmented arc-shaped ring 710 on the B surface 302 of the turntable flange. Lap the lower stop interface 711 with the upper stop interface 712. Then, insert the third bolt 720 through the threaded through-hole 714 and the threaded counterbore 713 and lock it by applying torque according to the bolt specification to assemble the ring 705. A groove 715 is formed on the outer arc surface of the ring 705. At this time, the A surface 716 of the ring is in contact with the B surface 302 of the turntable flange. Then, assemble the segmented arc-shaped seat ring 721 on the outer arc surface of the ring 705. Part of the seat ring 706 is snapped into the groove 715. At this time, the B surface 719 of the seat ring and the B surface 717 of the ring are on the same horizontal plane, and the height difference between the A surface 718 of the seat ring and the A surface 716 of the ring is 100 mm to 150 mm. Finally, insert the first bolt 703 through the ring through-hole 707 and the turntable flange through-hole 303 and lock it by applying torque according to the bolt specification to complete the connection between the segmented slewing bearing 7 and the turntable flange 3;

[0093] Step 5: Use the turntable main structure 1, the turntable flange 3, and the segmented slewing bearing 7 as a hoisting tooling and turn it over by a crane. After turning it over by 180 degrees, at this time, the bearing B surface 702 in the segmented slewing bearing 7 faces downward. Then, weld the turntable herringbone frame 2 on the B surface 102 of the turntable;

[0094] Step 6: Weld the base 5 to the base flange 4. At this time, the base flange B surface 402 in the base flange 4 is in contact with the base A surface 501 in the base 5;

[0095] Step 7: Use the turntable main structure 1, the turntable herringbone frame 2, the turntable flange 3, and the segmented slewing bearing 7 as a hoisting tooling and hoist it to the base flange A surface 401 by a crane. At this time, the bearing B surface 702 is in contact with the base flange A surface 401 of the base flange 4. Then, insert the second bolt 704 through the seat ring through-hole 708 and the base flange through-hole 403 and lock it by applying torque according to the bolt specification to complete the assembly of the slewing device.

[0096] Example 3:

[0097] The basic content is the same as that of Example 2, except that:

[0098] An external gear 709 is provided on the outer arc surface of the seat ring 706. A slewing reducer 6 is provided on the main structure 1 of the turntable. The slewing reducer 6 includes a slewing gear 61, a cantilever 63, and a gear shaft 65. The slewing gear 61 is connected below the cantilever 63 through the gear shaft 65, and the slewing gear 61 is coupled with the external gear 709. The upper tooth surface 62 of the slewing gear 61 and the cantilever surface 64 of the cantilever 63 are parallel to each other and are spaced apart by a certain distance to form a spacing difference H1. The A surface 716 of the collar and the A surface 718 of the seat ring are parallel to each other and differ by a certain height to form a height difference H, and the spacing difference H1 is consistent with the height difference H.

[0099] In application, controlling the height difference between the A surface 716 of the collar and the A surface 718 of the seat ring of the segmented slewing bearing 7 is to ensure that the spacing difference between the upper tooth surface 62 of the slewing gear 61 and the cantilever surface 64 of the cantilever 63 is kept consistent, avoiding the influence on the load transfer between the slewing gear 61 of the slewing reducer 6 and the external gear 709 due to an excessive installation distance. According to this installation step, this problem can be directly avoided, saving the debugging time and improving the assembly efficiency.

[0100] The above description is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modification or change made by those of ordinary skill in the art according to the disclosure of the present invention shall be included in the protection scope recorded in the claims.

Claims

1. An assembly method for a slewing device of a crane, characterized in that: The slewing device includes a turntable main structure (1), a turntable herringbone frame (2), a turntable flange (3), a base flange (4), a base (5) and a segmented slewing bearing (7); The segmented slewing bearing (7) includes a ring (705) and a race ring (706). The ring (705) includes a ring A surface (716) and a ring B surface (717) that are parallel to each other. The race ring (706) includes a race ring A surface (718) and a race ring B surface (719) that are parallel to each other; The ring (705) includes a number of arc ring segments (710) connected end to end in sequence. The race ring (706) includes a number of arc race ring segments (721) connected end to end in sequence; The assembly method includes the following steps: Step 1: Connect the turntable main structure (1) and the turntable flange (3). After connection, the turntable A surface (101) in the turntable main structure (1) is in contact with the turntable flange A surface (301) in the turntable flange (3); Step 2: A convex block (104) is provided on one side below the turntable B surface (102) of the turntable main structure (1), and a leveling tooling (103) is provided on the other side below the turntable B surface (102). Taking the convex block (104) as a fulcrum, by adjusting the height of the leveling tooling (103), the angle between the turntable flange B surface (302) in the turntable flange (3) and the horizontal plane is adjusted until the turntable flange B surface (302) is parallel to the horizontal plane; Step 3: Machine the turntable flange B surface (302) until its flatness geometric tolerance meets the installation requirements; Step 4: Place the arc ring segments (710) on the turntable flange B surface (302) and assemble them into a ring (705). At this time, the ring A surface (716) is in contact with the turntable flange B surface (302); then assemble the arc race ring segments (721) on the ring (705). At this time, the race ring B surface (719) and the ring B surface (717) are on the same horizontal plane and the height difference between the race ring A surface (718) and the ring A surface (716) meets the requirements; finally, connect the segmented slewing bearing (7) and the turntable flange (3); Step 5: Flip the turntable main structure (1), the turntable flange (3) and the segmented slewing bearing (7) as a whole by 180 degrees. After flipping, the bearing B surface (702) in the segmented slewing bearing (7) faces downward, and then connect the turntable herringbone frame (2) on the turntable B surface (102); Step 6: Connect the base flange (4) and the base (5). After connection, the base flange B surface (402) in the base flange (4) is in contact with the base A surface (501) in the base (5); Step 7: Assemble the turntable main structure (1), the turntable herringbone frame (2), the turntable flange (3), the segmented slewing bearing (7) and the base flange (4). At this time, the bearing B surface (702) is in contact with the base flange A surface (401) of the base flange (4), and then connect the segmented slewing bearing (7) and the base flange (4) to complete the assembly of the slewing device.

2. The assembly method of a crane slewing device according to claim 1, wherein: The main structure of the turntable (1) includes a turntable A surface (101) and a turntable B surface (102) that are parallel to each other. The turntable flange (3) includes a turntable flange A surface (301) and a turntable flange B surface (302) that are parallel to each other; the segmented slewing bearing (7) includes a bearing A surface (701) and a bearing B surface (702) that are parallel to each other; the base flange (4) includes a base flange A surface (401) and a base flange B surface (402) that are parallel to each other; the base (5) includes a base A surface (501) and a base B surface (502) that are parallel to each other; In the seventh step, the assembled state of the slewing device refers to: the turntable A surface (101) is in contact with the turntable flange A surface (301), the turntable flange B surface (302) is in contact with the bearing A surface (701), the bearing B surface (702) is in contact with the base flange A surface (401), and the base flange B surface (402) is in contact with the base A surface (501).

3. The assembly method of a crane slewing device according to claim 1, characterized in that: A plurality of ring perforations (707) are circumferentially arranged along the axis of the ring (705), and a plurality of turntable flange perforations (303) are arranged on the turntable flange (3) to match the plurality of ring perforations (707); A first bolt (703) is inserted into the ring perforation (707) and the turntable flange perforation (303), and the first bolt (703) is tightened to complete the connection between the segmented slewing bearing (7) and the turntable flange (3) in the fourth step; A plurality of seat ring perforations (708) are circumferentially arranged along the axis of the seat ring (706), and a plurality of base flange perforations (403) are arranged on the base flange (4) to match the plurality of seat ring perforations (708); A second bolt (704) is inserted into the seat ring perforation (708) and the base flange perforation (403), and the second bolt (704) is tightened to complete the connection between the segmented slewing bearing (7) and the base flange (4) in the seventh step; 4. The assembly method of a crane slewing device according to claim 1, characterized in that: One end of the arc-shaped ring segment (710) forms a lower stop interface (711), and the other end forms an upper stop interface (712); a threaded counterbore (713) is formed on the lower stop interface (711), a threaded through hole (714) is formed on the upper stop interface (712), and the threaded counterbore (713) and the threaded through hole (714) are connected by a third bolt (720); adjacent lower stop interfaces (711) and upper stop interfaces (712) overlap each other to form a ring-shaped ring (705).

5. The assembly method of a crane slewing device according to claim 1, characterized in that: An external gear (709) is provided on the outer arc surface of the seat ring (706). A slewing reducer (6) is provided on the main structure (1) of the turntable. The slewing reducer (6) includes a slewing gear (61), a cantilever arm (63), and a gear shaft (65). The slewing gear (61) is connected below the cantilever arm (63) through the gear shaft (65), and the slewing gear (61) is coupled with the external gear (709). The upper tooth surface (62) of the slewing gear (61) is parallel to the cantilever surface (64) of the cantilever arm (63) and a spacing difference (H1) is formed at a certain distance therebetween. The ring A surface (716) is parallel to the seat ring A surface (718) and a height difference (H) is formed at a certain height difference therebetween. The spacing difference (H1) is consistent with the height difference (H).

6. The assembling method of a crane slewing device according to claim 5, wherein: Both the spacing difference (H1) and the height difference (H) are: 100 mm to 150 mm.

7. The assembling method of a crane slewing device according to claim 1, wherein: In the second step, the leveling tooling (103) is: a cushion block, a sleeper or a hydraulic lifting device.

8. The assembling method of a crane slewing device according to claim 1, wherein: In the third step, the installation requirement of the turntable flange B surface (302) is: the flatness geometric tolerance ≤ 0.5 mm.

9. The assembling method of a crane slewing device according to claim 1, wherein: The tightening target of the first bolt (703) in the fourth step and the second bolt (704) in the seventh step is: applying a corresponding torque according to the bolt specification.

10. A method for assembling a slewing device of a crane according to claim 1, characterized in that: In the seventh step, the assembly of the segmented slewing bearing (7) and the base flange (4) means: hoisting the main structure (1) of the turntable, the turntable herringbone frame (2), the turntable flange (3) and the segmented slewing bearing (7) as a whole onto the base flange (4), so that the bearing B surface (702) is in contact with the base flange A surface (401) and the bearing B surface (702) is parallel to the base flange A surface.

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