Tooling and method for replacing slewing support of bucket wheel excavator

Abstract

The present invention relates to the technical field of bucket wheel stacker reclaimers in bulk material loading and unloading systems, and specifically to a tool and method for replacing a slewing support of a bucket wheel machine. The tool comprises a jacking device and a lead screw, wherein the bottom of the jacking device is fixed to the upper part of a portal frame, and the jacking device lifts a slewing platform; a support is installed at the bottom of the lead screw, and the support is fixed to the upper part of the portal frame, and the lead screw passes through the slewing platform, and the lead screw is threadedly connected to an upper adjusting nut and a lower adjusting nut respectively with the slewing platform as the boundary. The present invention does not require the equipment to be dismantled to achieve the purpose of replacing the slewing bearing, which saves replacement time and cost, and is safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of bucket wheel stacker reclaimers in bulk material loading and unloading systems, and in particular to a tool and method for replacing a slewing support of a bucket wheel machine. Background Art

[0002] Bucket wheel stacker-reclaimer is a large-scale loading and unloading equipment with high efficiency and continuous operation. It is suitable for stacking and retrieving materials in bulk material storage yards in industries such as ports, large and medium-sized thermal power plants and metallurgical enterprises.

[0003] The slewing device is an important component of the bucket wheel stacker and reclaimer. The slewing device is mainly composed of a motor, a reducer, a coupling, a slewing bearing, etc. Among them, the slewing bearing is the most important part supporting the entire bucket wheel machine and the bucket wheel machine reloading, and plays a vital role. Therefore, the slewing bearing must be checked regularly and must be replaced if it is worn.

[0004] The conventional way to replace the slewing bearing of a bucket wheel excavator is to remove all the components on the upper part of the slewing steel structure (mainly including the bucket wheel device, cantilever beam, cantilever tie rod, counterweight arm, counterweight tie rod, pitch steel structure, counterweight, etc.) before replacing it. The disadvantages of this replacement method are long replacement cycle, high cost and low safety factor. Summary of the invention

[0005] In view of the defects of the prior art, the present invention provides a tooling and method for replacing the slewing support of a bucket wheel excavator, which does not require dismantling of the equipment to achieve the purpose of replacing the slewing bearing, thereby saving replacement time and cost and being safe and reliable.

[0006] In order to achieve the above-mentioned purpose, the technical solution proposed in one aspect of the present invention is a tooling for replacing the slewing support of a bucket wheel excavator, wherein the slewing support is a slewing bearing, and the tooling includes a lifting device and a screw, wherein the bottom of the lifting device is fixed to the upper part of the portal frame, and the lifting device lifts the slewing platform; a support is installed at the bottom of the screw, and the support is fixed to the upper part of the portal frame, and the screw passes through the slewing platform, and the upper adjusting nut and the lower adjusting nut are respectively threadedly connected on the screw with the slewing platform as the boundary.

[0007] Furthermore, the tooling for replacing the slewing support of the bucket wheel excavator also includes a guide device, which includes an upper guide member and a lower guide member slidably connected thereto, the top of the upper guide member is fixed to the bottom of the slewing platform, and the bottom of the lower guide member is fixed to the upper part of the portal frame.

[0008] Furthermore, the upper guide member is a guide sleeve, and the lower guide member is a guide column that cooperates with the guide sleeve.

[0009] Preferably, the lifting device is a mechanical jack.

[0010] Furthermore, four lifting devices are provided and are respectively fixed at the four corners of the gate frame.

[0011] Furthermore, four screws are provided and fixed at the four corners of the door frame respectively, and the screws are provided close to the jacking device.

[0012] On the other hand, the present invention provides a method for replacing a slewing support of a bucket wheel excavator, the specific steps of which include:

[0013] Step 1: Rotate the bucket wheel machine cantilever beam to a suitable position to support the rotating bucket wheel machine cantilever beam;

[0014] Step 2: Remove the fixing bolts of the outer ring of the slewing bearing in sequence, and loosen the fixing bolts of the inner ring of the slewing bearing;

[0015] Step 3: Place the lead screw with the support on the upper part of the gate frame, weld it firmly, and remove the inner ring fixing bolts;

[0016] Step 4: Use four mechanical jacks to lift and separate the slewing platform and the slewing bearing at the four corners of the portal frame; during the lifting process, the four mechanical jacks have the same lifting height, and the mechanical jacks at the four corners lift in turn. The height of each lifting should be controlled within 2mm, and the lifting should stop when it is 200mm; lift the jack, and adjust the two nuts connected to the screw thread on the support at any time according to the lifting amount.

[0017] Step 6: Pull out the slewing bearing to make a slewing bearing slideway, and pull out the slewing bearing in parallel.

[0018] Furthermore, the step 3 also includes welding four guide devices at the four corners of the rotating platform and the door frame.

[0019] Furthermore, rotating the bucket wheel excavator cantilever beam to a suitable position in step 1 specifically refers to rotating the cantilever beam 90° to be perpendicular to the track direction.

[0020] Furthermore, in step 4, the mechanical jacks at the four corners are lifted in turn, specifically, the jack at a corner point of the portal frame is lifted by 2 mm, and the lead screw at the corner point is adjusted at the same time. First, the lower adjusting nut on the lead screw is adjusted to make it close to the lower plane of the rotating platform without any gap, and then the upper adjusting nut is adjusted, and then the jacks at other corner points are lifted clockwise in turn.

[0021] The beneficial effects of the present invention are as follows: it is not necessary to dismantle the equipment to achieve the purpose of replacing the slewing bearing, which saves replacement time and cost and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the tooling of the present invention;

[0023] Figure 2 It is a schematic diagram of the positions of various tooling on the plane of the door frame;

[0024] Figure 3 It is a schematic diagram of the structure of a bucket wheel excavator;

[0025] Figure 4 for Figure 3 A partial enlarged view of part A;

[0026] In the figure: 1. portal frame, 2. slewing platform, 3. lead screw, 4. support, 5. upper adjusting nut, 6. lower adjusting nut, 7. guide device, 7.1. upper guide member, 7.2. lower guide member, 8. mechanical jack, 9. cantilever beam, 10. cantilever pull rod, 11. counterweight pull rod, 12. slewing bearing, 13. slewing bearing sliding direction, 14. slewing bearing slideway. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the tooling for replacing the slewing support of a bucket wheel excavator comprises a lifting device and a screw 3, wherein the bottom of the lifting device is fixed to the upper part of a portal frame 1, and the lifting device lifts a slewing platform 2; a support 4 is installed at the bottom of the screw 3, and the support 4 is fixed to the upper part of the portal frame 1, and the screw 3 passes through the slewing platform 2, and an upper adjusting nut 5 and a lower adjusting nut 6 are respectively threadedly connected to the screw 3 with the slewing platform 2 as the boundary.

[0029] The tooling for replacing the slewing support of the bucket wheel excavator also includes a guide device 7, which includes an upper guide member 7.1 and a lower guide member 7.2 slidably connected thereto, the top of the upper guide member 7.1 is fixed to the bottom of the slewing platform 2, and the bottom of the lower guide member 7.2 is fixed to the upper part of the portal frame 1.

[0030] The upper guide member 7.1 is a guide sleeve, and the lower guide member 7.2 is a guide column that cooperates with the guide sleeve.

[0031] The lifting device is a mechanical jack 8.

[0032] The jacking devices are provided in four pieces and are respectively fixed at the four corners of the door frame 1 .

[0033] The lead screws 3 are provided in four numbers and are respectively fixed at the four corners of the door frame 1 , and the lead screws 3 are arranged close to the jacking device.

[0034] like Figure 2 As shown in the figure, the method for replacing the slewing support of a bucket wheel excavator is as follows:

[0035] Step 1: First, drive the bucket wheel excavator to the specified position, rotate the cantilever beam 9 90° to the right to be perpendicular to the track direction, place the cantilever beam 9 on the previously compacted material pile for compaction, check whether the cantilever tie rod 10 and the counterweight tie rod 11 are loose, and ensure that the two tie rods are not loose, then the support for the rotating bucket wheel excavator cantilever beam 9 is completed.

[0036] Step 2: Remove the fixing bolts between the outer ring of the slewing bearing and the lower door frame 1 in sequence, and loosen the fixing bolts between the inner ring of the slewing bearing and the slewing platform again (clean the dirt on the bolts in advance and spray them with loosening agent before removing them). It should be noted that the fixing bolts of the outer ring are removed, and the fixing bolts of the inner ring are loosened but not removed.

[0037] Step 3: Place the tooling on the door frame 1 and weld it firmly, and remove the inner ring fixing bolts. Specifically, four guide devices are welded at the four corners of the rotating platform 2 and the door frame 1 to guide and position the subsequent lifting and lowering processes. In addition, four lead screws 3 and supports 4 are fixed at the four corners of the rotating platform 2 and the door frame 1 to prevent tilting.

[0038] Step 4: Use four mechanical jacks 8 to lift and separate the slewing platform 2 and the slewing bearing 12 at the four corners of the portal frame 1. The specific process is that the mechanical jacks are set between the portal frame and the slewing platform, lift the slewing platform 2, and separate the slewing bearing 12 from the slewing platform 2.

[0039] Four mechanical jacks 8 jack up the rotary platform 2 in four directions. In the process of jacking up, unified command is given to make the jacking heights of the four mechanical jacks 8 consistent. During jacking up, the mechanical jacks 8 are jacked up one by one clockwise or counterclockwise, 2mm each time, and the heights of different mechanical jacks 8 should be controlled within 2mm. The jacking up stops when 200mm is lifted.

[0040] While lifting the mechanical jack 8, adjust the two adjusting nuts (upper adjusting nut 5 and lower adjusting nut 6) on the lead screw 3 on the mounting bracket beside each mechanical jack 8 at any time according to the lifting amount, so as to play a protective role of tensioning and supporting.

[0041] It should be noted that taking turns to jack up can avoid problems with one of the jacks during jacking, which may cause shaking and make the jacking more stable and safe.

[0042] Specifically, if Figure 2As shown, first lift the jack at position A by 2mm, and at the same time adjust the lead screw at position A, first adjust the lower adjustment nut on the lead screw to make it close to the steel plate plane without gap, and then adjust the upper adjustment nut. Then lift positions B, C, and D in turn.

[0043] Step 5: Make a slewing bearing slideway 14 where the slewing bearing needs to be pulled out, and pull the slewing bearing out in parallel. The slideway is made of a seamless steel pipe with a diameter of 108 mm. Use a fall chain to pull the slewing bearing outwards, and finally use a crane to lift the slewing bearing ring out.

[0044] It should be noted that between step 3 and step 4, that is, before the mechanical jack 8 is lifted, marking should be done, and during the lifting process, the lifting height should be measured at any time to ensure that the lifting height of each mechanical jack 8 is consistent; during the lifting, the lifting situation should be checked at any time to adjust the lifting height of the mechanical jack 8.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for replacing a slewing support of a bucket wheel excavator, characterized in that: A tooling for replacing the slewing support of a bucket wheel excavator is used, and the tooling for replacing the slewing support of the bucket wheel excavator includes a jacking device and a lead screw. The bottom of the jacking device is fixed to the upper part of the portal frame, and the jacking device jacks the slewing platform; a support is installed at the bottom of the lead screw, and the support is fixed to the upper part of the portal frame. The lead screw passes through the slewing platform, and the upper adjusting nut and the lower adjusting nut are respectively threadedly connected on the lead screw with the slewing platform as the boundary; four jacking devices are arranged, and they are respectively fixed at the four corners of the portal frame; four lead screws are arranged, and they are respectively fixed at the four corners of the portal frame, and the lead screws are arranged close to the jacking device; The specific steps include: Step 1: Rotate the bucket wheel machine cantilever beam to a suitable position to support the rotating bucket wheel machine cantilever beam; Step 2: Remove the fixing bolts of the outer ring of the slewing bearing in sequence, and loosen the fixing bolts of the inner ring of the slewing bearing; Step 3: Place the lead screw with the support on the upper part of the gate frame, weld it firmly, and remove the inner ring fixing bolts; Step 4: Use four mechanical jacks to lift and separate the slewing platform and the slewing bearing at the four corners of the portal frame; during the lifting process, the lifting heights of the four mechanical jacks are consistent, and the mechanical jacks at the four corners are lifted in turn during the lifting, and the height of each lifting should be controlled within 2mm, and the lifting should stop when it is 200mm; lift the jacks, and adjust the two nuts connected to the lead screw thread on the support at any time according to the lifting amount while lifting the jacks; the mechanical jacks at the four corners in step 4 are lifted in turn in particular, specifically lifting the jack at a corner point of the portal frame by 2mm, and adjusting the lead screw at the corner point at the same time, first adjusting the lower adjusting nut on the lead screw to make it close to the lower plane of the slewing platform without gap, and then adjusting the upper adjusting nut, and then lifting the jacks at other corner points clockwise in turn; Step 6: Remove the slew bearing and pull it out.

2. The method for replacing a slewing support of a bucket wheel excavator according to claim 1, characterized in that: The step 3 also includes welding four guide devices to the four corners of the rotary platform and the door frame.

3. The method for replacing a slewing support of a bucket wheel excavator according to claim 1, characterized in that: The step 6 specifically comprises making a slewing bearing slideway at the position where the slewing bearing is pulled out, and pulling the slewing bearing out in parallel.

4. The method for replacing a slewing support of a bucket wheel excavator according to claim 1, characterized in that: The tooling for replacing the bucket wheel excavator's slewing support also includes a guide device, which includes an upper guide member and a lower guide member slidably connected thereto, the top of the upper guide member is fixed to the bottom of the slewing platform, and the bottom of the lower guide member is fixed to the upper part of the portal frame.

5. The method for replacing a slewing support of a bucket wheel excavator according to claim 4, characterized in that: The upper guide member is a guide sleeve, and the lower guide member is a guide column that cooperates with the guide sleeve.

6. The method for replacing a slewing support of a bucket wheel excavator according to any one of claims 1, 4 and 5, characterized in that: The lifting device is a mechanical jack.

Images