Welding auxiliary structure for guaranteeing coaxiality of different-diameter extra-long pipe parts

Abstract

An auxiliary welding structure for guaranteeing coaxiality of different-diameter extra-long pipe parts comprises a bearing support and hollow shaft sleeves, a welding part is composed of shaft necks, two hollow shafts and flanges, the outer diameter of each hollow shaft sleeve is matched with the inner diameter of the corresponding hollow shaft, each hollow shaft sleeve is arranged in the corresponding two adjacent hollow shafts in a sleeved mode, and after the shaft necks, the two hollow shafts and the flanges are assembled, the two hollow shafts are connected in a sleeved mode. And bearing brackets are respectively arranged at the joint of the shaft neck and the two hollow shafts and at the bottom of the flange. Compared with the prior art, the special-diameter extra-long pipe part machining and manufacturing method has the advantages that the special-diameter extra-long pipe part machining and manufacturing method capable of meeting the coaxiality requirement solves the machining problem that the coaxiality requirement of the two ends of an extra-long pipe part with different diameters is high, and the coaxiality requirement of welded parts after welding is met.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical manufacturing, and particularly relates to a welding auxiliary structure for ensuring the coaxiality of a special-shaped long pipe-like part. Background Art

[0002] The hollow shaft of the ф2400 classifier in the Waitoushan Iron Mine of a certain steel plant consists of three parts. The middle part is a ф600 hollow shaft with a length of 13860 mm. The left side of the hollow shaft is fitted and welded with a shaft neck with a length of 1396 mm, and the right side is fitted and welded with a flange with a length of 270 mm. Technically, it is required that the inner hole size and end face of the flange be machined after being assembled with the 13860-mm hollow shaft in the middle part. The coaxiality deviation between the center of the inner hole of the flange and the center of the other shaft neck is less than 2 mm over the full length of 14990 mm (the actual full length after removing the mating part is 14990 mm). According to the normal process, secondary machining allowances need to be reserved for the inner hole, end face and shaft neck of the flange. After welding, the whole is aligned on the machine tool to machine the inner hole of the flange, the outer circle of the shaft neck and the full length. However, the maximum machining length of the horizontal lathe in the machining company is 12 meters, and it does not have such machining capacity. Content of the Utility Model

[0003] The purpose of the utility model is to provide a welding auxiliary structure for ensuring the coaxiality of a special-shaped long pipe-like part, solve the machining problem of high coaxiality requirements at both ends of a special-shaped long unequal-diameter pipe-like part, and ensure the coaxiality requirements of the welded part after welding.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A welding auxiliary structure for ensuring the coaxiality of a special-shaped long pipe-like part includes a bearing bracket and a hollow shaft sleeve. The welded part is composed of a shaft neck, two sections of hollow shafts and a flange. The outer diameter of the hollow shaft sleeve matches the inner diameter of the hollow shaft, and the hollow shaft sleeve is sleeved in two adjacent hollow shafts. After the shaft neck, two sections of hollow shafts and the flange are assembled, bearing brackets are respectively supported at the connection of the shaft neck, two hollow shafts and the bottom of the flange.

[0006] The bearing bracket includes a base, a bracket, a bearing and an adjusting bolt. The bracket is fixed on the base. A groove is provided at the center of the upper end of the bracket, and bearings are installed on both sides of the groove. The adjusting bolt is screwed on the base.

[0007] The length of the hollow shaft sleeve is 300 - 400 mm.

[0008] The shaft neck, hollow shaft and flange have different diameters respectively.

[0009] The overall length of the welded part exceeds 12 m.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] A welding auxiliary structure for ensuring the coaxiality of a special-shaped long pipe part solves the processing problem of high coaxiality requirements at both ends of a special-shaped long unequal-diameter pipe part and ensures the coaxiality requirements of the welded part after welding.

[0012] The utility model can be used for the processing and manufacturing of pipe parts with a length of 30 meters or more and high coaxiality requirements at both ends. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of a welding auxiliary structure for ensuring the coaxiality of a special-shaped long pipe part of the utility model.

[0014] Figure 2 It is Figure 1 The view in the direction of A-A of

[0015] Figure 3 It is Figure 1 The view in the direction of B-B of

[0016] Figure 4 It is Figure 1 The view in the direction of C-C of

[0017] In the figure: 1 - journal, 2 - hollow shaft, 3 - flange, 4 - hollow shaft sleeve, 5 - bearing bracket, 6 - bearing, 7 - bracket, 8 - base, 9 - height-adjusting bolt. Detailed Embodiment

[0018] The following further describes the embodiments of the utility model with reference to the drawings:

[0019] See Figures 1-4 , the embodiment is to process and manufacture a hollow shaft of a classifier with a full length of 14990 mm. The shaft is composed of three parts, and the middle part is a hollow shaft 2 with a diameter of ф600 and a length of 13860 mm.

[0020] A processing and manufacturing method for ensuring the coaxiality requirements of a special-shaped long pipe part includes the following method steps:

[0021] 1) The welded parts include a journal 1, a hollow shaft 2, and a flange 3. First, the journal 1 and the flange 3 are processed separately, and the hollow shaft 2 is processed into two pipe fittings of the same length.

[0022] The middle part of the hollow shaft 2 is processed into two hollow shafts with a length of 6.93 meters. The coaxiality deviation at both ends of the two hollow shafts with a length of 6.93 meters is ensured to be within 0.5 mm by a 12-meter horizontal lathe.

[0023] Secondary machining allowances need to be reserved for the inner hole, end face of the flange 3 and the journal 1.

[0024] 2) Three bearing brackets 5 are manufactured. First, the journal 1 is welded to one of the hollow shafts 2 by using the bearing bracket 5 , and then the flange 3 is welded to the other hollow shaft 2 by using the bearing bracket 5 .

[0025] 3) Make a hollow sleeve 4 whose outer diameter matches the inner diameter of the hollow shaft 2, put the hollow sleeve 4 inside the two hollow shafts 2 to assemble the two hollow shafts 2 together, and respectively set up three bearing brackets 5 on the journal 1, the connection between the two hollow shafts 2 and the bottom of the flange 3.

[0026] 4) Adjust the horizontal height of the bearing brackets 5 at both ends and measure with a spirit level to make both ends of the hollow shaft 2 in a horizontal position.

[0027] 5) Adjust the horizontal height of the intermediate bearing bracket 5 and measure with a spirit level to ensure that the center deviation of the hollow shaft neck end and flange end is within 1 mm, and spot weld the butt joint of the hollow shaft 2 on both sides in a horizontal position.

[0028] 6) Rotate the hollow shaft 2 by 90°, adjust the horizontal height of the intermediate bearing bracket 5, check that the center deviation of the hollow shaft neck end and the flange end is within 1mm, and spot weld the two sides of the hollow shaft joint in the horizontal position.

[0029] 7) Rotate the hollow shaft 2 by 45°, and use the same method to adjust the center deviation of the journal end and the flange end within 1mm, and spot weld on both sides of the horizontal position of the butt joint of the hollow shaft 2; rotate the hollow shaft 2 by 90° again, adjust the horizontal height of the intermediate bearing bracket 5, detect the center deviation of the journal end and the flange end of the hollow shaft within 1mm, and spot weld on both sides of the horizontal position of the butt joint of the hollow shaft 2. At this time, the center deviation of the journal end and the flange end of the entire hollow shaft 2 can be within 1mm within the circumference of 360°.

[0030] 8) The butt joint of hollow shaft 2 is fully welded and welded symmetrically. Inspection is performed while welding to eliminate welding stress and ensure that the coaxiality deviation at both ends is within 1mm.

[0031] Control deformation during welding to ensure that the coaxiality deviation of the inner holes at both ends of the 13860mm hollow shaft 2 is less than 1mm. Use an oil caliper and a straight ruler to detect the deviation of the flange inner hole, and allow the swing amplitude of the middle part of the hollow shaft to be less than 10mm.

[0032] The fitting tolerance between the two hollow shafts and the hollow shaft sleeves is required to be within 0.3 mm, the fitting tolerance between the journal and the hollow shaft is required to be within 0.1 mm, and the fitting tolerance between the flange and the hollow shaft is required to be within 0.1 mm.

[0033] A welding auxiliary structure for a machining method to ensure the coaxiality of a special-shaped and extra-long pipe-like part, including a bearing bracket 5 and a hollow shaft sleeve 4. The welded part consists of a shaft neck 1, a two-section hollow shaft 2, and a flange 3. The outer diameter of the hollow shaft sleeve 4 matches the inner diameter of the hollow shaft 2 and is sleeved inside two adjacent hollow shafts 2. After the shaft neck 1, the two-section hollow shaft 2, and the flange 3 are assembled, bearing brackets 5 are respectively supported at the connection of the shaft neck 1 and the two hollow shafts 2 and at the bottom of the flange 3.

[0034] The bearing bracket 5 includes a base 8, a bracket 7, a bearing 6, and an adjusting bolt 9. The bracket 7 is fixed on the base 8. A groove is provided at the central part of the upper end of the bracket 7, and bearings 6 are installed on both sides of the groove. The adjusting bolt 9 is screwed on the base 8.

[0035] The bearing bracket 5 can meet the need for rotary welding of the hollow shaft 2. At the same time, the bearing bracket 5 can adjust the horizontal height to meet the alignment requirement. Three threaded holes are drilled on the bottom plate of the bearing bracket 5 to install the adjusting bolt 9 to adjust the horizontal height of the hollow shaft 5. A total of three bearing brackets 5 need to be designed and manufactured. One bearing bracket 5 supports the outer circle of the flange 3, one bearing bracket 5 supports the outer circle of the shaft neck 1, and the other bearing bracket 5 supports the middle docking part of the 13860mm hollow shaft 2. The hollow shaft 2 can be rotated arbitrarily on the bearing bracket 5 for horizontal alignment and welding at any point on the circumference.

[0036] The length of the hollow shaft sleeve 4 is 300 - 400mm.

[0037] The overall length of the welded part exceeds 12m.

[0038] The shaft neck 1, the hollow shaft 2, and the flange 3 have different diameters respectively.

[0039] For the coaxiality requirement of the welded part, it is necessary to ensure that the coaxiality deviation of the inner holes at both ends is less than 1mm. A high-precision measuring level (with a 0.5mm scale line clearly visible within 1 km) is used for measurement control. The deformation amount is measured while welding, and welding correction is carried out at any time to control the deviation at both ends not to exceed 1mm.

[0040] The whole must be rotated at any time to ensure the needs of measurement and welding.

[0041] Vibrate while welding (using a vibration stress reliever) to detect the stress value and eliminate the welding stress.

[0042] To ensure that the deviation at both ends does not exceed 1mm, a high-precision measuring level must be used, and the measurement control is carried out based on the inner hole of the flange and the outer circle of the shaft neck.

[0043] After inspection after welding, the coaxiality deviation at both ends of the welded part with a total length of 14990 mm is 0.9 mm, fully meeting the requirements of the drawing. Due to the influence of welding, the cylindricity of the inner hole of the flange exceeds the tolerance by 0.2 mm within a 20-mm-wide circumference. Since a second machining allowance is reserved for the inner hole of the flange, it is machined a second time on a boring machine to ensure the tolerance requirements of the inner hole of the flange.

Claims

1. A welding auxiliary structure for ensuring the coaxiality of different diameter extra-long pipe parts, characterized in that: It includes a bearing bracket and a hollow shaft sleeve. The welded part consists of a shaft neck, two hollow shafts and a flange. The outer diameter of the hollow shaft sleeve matches the inner diameter of the hollow shaft and is sleeved in two adjacent hollow shafts. After the shaft neck, the two hollow shafts and the flange are assembled, the bearing bracket is respectively supported at the shaft neck, the connection between the two hollow shafts and the bottom of the flange.

2. The welding auxiliary structure for ensuring the coaxiality of different-diameter extra-long pipe parts according to claim 1 is characterized in that: The bearing bracket comprises a base, a bracket, a bearing and a height adjustment bolt. The bracket is fixed on the base. A groove is provided at the center of the upper end of the bracket. Bearings are installed on both sides of the groove. The height adjustment bolt is screwed to the base.

3. The welding auxiliary structure for ensuring coaxiality of different diameter extra-long pipe parts according to claim 1 is characterized in that: The hollow shaft sleeve is 300-400 mm long.

4. The welding auxiliary structure for ensuring coaxiality of different diameter extra-long pipe parts according to claim 1 is characterized in that: The journal, hollow shaft and flange are of different diameters.

5. The welding auxiliary structure for ensuring coaxiality of different diameter extra-long pipe parts according to claim 1 is characterized in that: The overall length of the weldment exceeds 12 m.

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