Machining process and device for large-diameter rotary drum

Abstract

The invention relates to the technical field of rotary drum machining, in particular to a large-diameter rotary drum machining technology and device.The large-diameter rotary drum machining device comprises a rotary drum body and a hoisting assembly, and the hoisting assembly comprises a welding plate and a penetrating sleeve and further comprises a first flat plate, a second flat plate, a first radial plate, a second radial plate, a first rib plate and a second rib plate. The hoisting assembly, the first flat plate, the second flat plate, the first radial plate, the second radial plate, the first rib plate and the second rib plate are firstly welded on the drum body according to the process requirements, the welding seam is polished after welding, and then machining can be continued, so that better stability can be directly ensured during hoisting and machining of the drum, and the machining efficiency is improved. And the internal deformation of the rotary drum can be avoided, so that the problem of low internal structural rigidity of the rotary drum during processing in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of rotary drum processing technology, and in particular to a processing technology and apparatus for large-diameter rotary drums. Background Technology

[0002] Currently, the main materials used for the drum body are 304, 316, and duplex stainless steel, with stainless steel welding being the primary forming method and forging used to a small extent. Welded drums have a coarse grain structure in the heat-affected zone at the weld seam, which affects their mechanical properties and corrosion resistance. Forged drums, on the other hand, have a low yield, numerous processes, a long production cycle, and high costs.

[0003] Under current technology, there is already a lot of mature experience in processing drums with a diameter of <5 meters, a height of >1.5 meters, and a weight of >30 tons. However, there is a lack of processing equipment for large-diameter, 2-meter-high, and 57-ton heavy drums, which makes it easy for the internal structure to have low rigidity during hoisting or processing. Summary of the Invention

[0004] The purpose of this invention is to provide a processing technology and apparatus for large-diameter drums, aiming to solve the problem of low internal structural rigidity of drums during processing in the prior art.

[0005] To achieve the above objectives, the present invention provides a processing device for a large-diameter drum, including a drum body, two first outer edges and a second outer edge provided on the drum body, and a hoisting assembly welded to the drum body. The hoisting assembly includes a welding plate and a through sleeve. The welding plate is welded to the drum body, and the through sleeve is integrally formed with the welding plate.

[0006] A first plate and a second plate are provided on one side of the welding plate. The first plate and the second plate are respectively welded to the drum body and fixed to the welding plate.

[0007] The drum body is further provided with a first spoke, a second spoke, a first rib, and a second rib, which are arranged in a ring at intervals.

[0008] The drum body also includes a drum hub and an outer ring.

[0009] The drum body is also provided with a first small rib and a second small rib, which are arranged in a ring at intervals.

[0010] The number of the first small stiffener is 36, and the number of the second small stiffener is 48.

[0011] One of the processing techniques for a large-diameter rotary drum includes the following steps:

[0012] Prepare materials according to the drawings, and perform machining according to the welding drawings;

[0013] The hoisting components, first plate, second plate, first spoke, second spoke, first stiffener and second stiffener are welded onto the drum body according to the process requirements, and the weld is ground after welding.

[0014] The welded parts are subjected to ultrasonic testing, followed by stress relief through annealing, and finally surface cleaning through shot peening.

[0015] Apply primer, and the time interval between applying primer and shot peening should not exceed 4 hours;

[0016] After rough machining the inner hole and outer circle of the workpiece, ultrasonic testing is performed on the splicing weld.

[0017] The machine is precision-machined, and a processing line is marked out.

[0018] After drilling and tapping, the fitter deburrs.

[0019] Apply micaceous iron oxide epoxy intermediate paint (two-component) to the non-machined surface, with a thickness of 25-30μm, totaling 50-60μm with the primer;

[0020] Non-processed surface coating with acrylic polyurethane topcoat (two-component), thickness 50-60μm, two coats of wet-on-wet spraying, total thickness 80-120μm, topcoat color is RAL1003 signal yellow.

[0021] Inspection and warehousing.

[0022] After rough machining the inner hole and outer circle of the workpiece, ultrasonic testing is performed on the splicing weld, followed by magnetic particle testing of the splicing area, and then finish machining.

[0023] Among them, the wall thickness and wall thickness difference of the finished welded product are both greater than 5mm when grinding the weld.

[0024] This invention discloses a processing device for a large-diameter drum. During drum processing, the hoisting assembly, first plate, second plate, first spoke, second spoke, first stiffening plate, and second stiffening plate are welded onto the drum body according to process requirements. After welding, the weld seams are ground, and processing can continue. This structure directly ensures better stability during drum hoisting and processing, and avoids internal deformation of the drum, thereby solving the problem of low internal structural rigidity of the drum during processing in the prior art. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0026] Figure 1 This is a schematic diagram of the overall structure of the large-diameter drum processing device of the present invention.

[0027] Figure 2 This invention follows Figure 1 A cross-sectional view of MM.

[0028] Figure 3 This is a schematic diagram showing the location of the first small stiffener of the present invention.

[0029] Figure 4 This is a schematic diagram showing the location of the second small stiffener of the present invention.

[0030] Figure 5 This is the invention Figure 2 Enlarged view of point A in the middle.

[0031] Figure 6 This is a structural schematic diagram of the hoisting assembly of the present invention.

[0032] Figure 7 This is a flowchart of the processing technology for a large-diameter rotary drum.

[0033] In the diagram: 1-Lifting assembly, 101-Welding plate, 102-Passing sleeve, 12-First flat plate, 13-Second flat plate, 6-First spoke, 7-Second spoke, 8-First stiffener, 9-Second stiffener, 2-Drum hub, 3-Drum outer ring, 4-First outer edge, 5-Second outer edge, 10-First small stiffener, 11-Second small stiffener, 100-Drum body, 200-Primer spraying point. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0035] like Figures 1 to 6 As shown, where Figure 1 This is a schematic diagram of the overall structure of a large-diameter rotary drum processing device. Figure 2 It is along Figure 1 Cross-sectional view of MM, Figure 3 This is a schematic diagram showing the location of the first small stiffening plate 10. Figure 4 This is a schematic diagram showing the location of the second small stiffener 11. Figure 5 yes Figure 2 Enlarged view of point A in the middle. Figure 6This is a structural schematic diagram of the hoisting assembly 1. The present invention provides a processing device for a large-diameter drum: it includes a drum body 100 and a hoisting assembly 1. The hoisting assembly 1 includes a welding plate 101 and a through sleeve 102, and also includes a first flat plate 12, a second flat plate 13, a first spoke plate 6, a second spoke plate 7, a first stiffening plate 8, and a second stiffening plate 9. The aforementioned solution can solve the problem of low internal structural rigidity of the drum during processing in the prior art. It is understood that the aforementioned solution can ensure good internal rigidity of the drum during processing, guaranteeing the processing dimensions.

[0036] In this embodiment, the drum body 100 is provided with two first outer edges 4 and second outer edges 5.

[0037] The welding plate 101 is welded onto the drum body 100, and the through sleeve 102 is integrally formed with the welding plate 101. After the welding plate 101 is welded and fixed, the through sleeve 102 is installed. The through sleeve 102 is used to set the hoisting rope.

[0038] A first plate 12 and a second plate 13 are provided on one side of the welding plate 101. The first plate 12 and the second plate 13 are respectively welded to the drum body 100 and welded and fixed to the welding plate 101. The first plate 12 and the second plate 13 are used for reinforcement.

[0039] The drum body 100 is further provided with a first spoke 6, a second spoke 7, a first rib 8, and a second rib 9, which are arranged in a ring at intervals. The first spoke 6, the second spoke 7, the first rib 8, and the second rib 9 further form a reinforcing structure inside the drum body 100.

[0040] Secondly, the drum body 100 also has a drum hub 2 and a drum outer ring 3.

[0041] Then, the drum body 100 is further provided with a first small rib 10 and a second small rib 11, which are arranged in a ring at intervals. The ribs should be equally divided, with an outer chord error of no more than 4mm, and the internal ribs should be aligned, with the deviation of the ribs in the same direction not exceeding the plate thickness.

[0042] Finally, the number of the first small stiffening plate 10 is 36, and the number of the second small stiffening plate 11 is 48.

[0043] When using the large-diameter drum processing device of the present invention, during drum processing, the welding plate 101, the through sleeve 102, the first flat plate 12, the second flat plate 13, the first spoke plate 6, the second spoke plate 7, the first stiffening plate 8, and the second stiffening plate 9 are welded to the corresponding positions on the drum body 100 according to the process requirements. All plates must be flat and free of defects before welding. The bevel of all unmarked welds is 8×45°. The welding is required to be firm and free of sand inclusions, cracks, weld slag, and spatter. After welding, the weld seam is ground and then further processing can be carried out. Two coats of anti-rust primer are sprayed at the corresponding positions of the primer spraying points 200 on the inner cavity. After the drum is processed, the outer diameter is 7000±0.15. Rolling deviation should be left. Surface rolling treatment is performed. The surface hardness of the outer ring 3 of the drum is greater than 160HBS. This structure can directly ensure better stability during drum hoisting and processing, and can avoid internal deformation of the drum, thereby solving the problem of low internal structural rigidity of the drum during processing under the existing technology.

[0044] like Figure 7 As shown, where Figure 7 This is a flowchart of a processing technology for a large-diameter drum according to the present invention. The present invention provides a processing technology for a large-diameter drum, including the following steps:

[0045] S1: Prepare materials according to the drawings and perform machining according to the welding drawings;

[0046] S2: Weld the hoisting assembly 1, the first plate 12, the second plate 13, the first spoke 6, the second spoke 7, the first stiffener 8 and the second stiffener 9 onto the drum body 100 according to the process requirements, and grind the weld after welding.

[0047] S3: Ultrasonic testing is performed on the welded parts, followed by stress relief through annealing, and finally surface cleaning is carried out by shot peening.

[0048] S4: Apply primer, and the time interval between applying primer and shot peening shall not exceed 4 hours;

[0049] S5: After rough machining the inner hole and outer circle of the workpiece, perform ultrasonic testing on the splicing weld.

[0050] S7: Finish turning, and mark a processing line;

[0051] S8: Deburring by fitter after drilling and tapping;

[0052] S9: Apply micaceous iron oxide intermediate paint (two-component) to non-machined surfaces, with a thickness of 25-30μm, totaling 50-60μm with the primer;

[0053] S10: Non-processed surface coating acrylic polyurethane topcoat (two-component), thickness 50-60μm, topcoat applied in two wet-on-wet sprays, total thickness 80-120μm, topcoat color is RAL1003 signal yellow.

[0054] S11: Inspection and warehousing.

[0055] After rough machining the inner hole and outer circle of the workpiece, ultrasonic testing is performed on the splicing weld, followed by magnetic particle testing at the splicing joint (step S6), and then finish machining is performed.

[0056] Among them, the wall thickness and wall thickness difference of the finished welded product are both greater than 5mm when grinding the weld.

[0057] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A processing device for a large-diameter drum, comprising a drum body, wherein the drum body is provided with two first outer edges and a second outer edge, characterized in that: A hoisting assembly is welded onto the drum body. The hoisting assembly includes a welding plate and a through sleeve. The welding plate is welded onto the drum body, and the through sleeve is integrally formed with the welding plate. A first plate and a second plate are provided on one side of the welding plate. The first plate and the second plate are respectively welded to the drum body and fixed to the welding plate. The drum body is further provided with a first spoke, a second spoke, a first rib, and a second rib, which are arranged in a ring at intervals.

2. The processing apparatus for a large-diameter rotary drum as described in claim 1, characterized in that: The drum body also has a drum hub and an outer ring.

3. The processing apparatus for a large-diameter rotary drum as described in claim 1, characterized in that: The drum body is also provided with a first small rib and a second small rib, which are arranged in a ring at intervals.

4. The processing apparatus for a large-diameter rotary drum as described in claim 3, characterized in that: The number of the first small stiffener is 36, and the number of the second small stiffener is 48.

5. A processing technology for a large-diameter rotary drum, applicable to the processing apparatus for a large-diameter rotary drum as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Prepare materials according to the drawings, and perform machining according to the welding drawings; The hoisting components, first plate, second plate, first spoke, second spoke, first stiffener and second stiffener are welded onto the drum body according to the process requirements, and the weld is ground after welding. The welded parts are subjected to ultrasonic testing, followed by stress relief through annealing, and finally surface cleaning through shot peening. Apply primer, and the time interval between applying primer and shot peening should not exceed 4 hours; After rough machining the inner hole and outer circle of the workpiece, ultrasonic testing is performed on the splicing weld. The machine is precision-machined, and a processing line is marked out. After drilling and tapping, the fitter deburrs. Apply micaceous iron oxide epoxy intermediate paint (two-component) to the non-machined surface, with a thickness of 25-30μm, totaling 50-60μm with the primer; Non-processed surface coating with acrylic polyurethane topcoat (two-component), thickness 50-60μm, two coats of wet-on-wet spraying, total thickness 80-120μm, topcoat color is RAL1003 signal yellow. Inspection and warehousing.

6. The processing technology for a large-diameter drum as described in claim 5, characterized in that: After rough machining the inner hole and outer circle of the workpiece, ultrasonic testing is performed on the splicing weld, followed by magnetic particle testing of the splicing area, and then finish machining is performed.

7. The processing technology for a large-diameter drum as described in claim 5, characterized in that: When grinding the weld, the wall thickness and wall thickness difference of the finished weld are both greater than 5mm.

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