CN116475536A - Welding structure and process for taking out broken screw on manhole body of ball mill - Google Patents
Welding structure and process for taking out broken screw on manhole body of ball mill Download PDFInfo
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- CN116475536A CN116475536A CN202310511767.XA CN202310511767A CN116475536A CN 116475536 A CN116475536 A CN 116475536A CN 202310511767 A CN202310511767 A CN 202310511767A CN 116475536 A CN116475536 A CN 116475536A
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- shaped inner
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- 238000003466 welding Methods 0.000 title claims abstract description 246
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000010410 layer Substances 0.000 claims description 50
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000002932 luster Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 239000010937 tungsten Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 230000037452 priming Effects 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a welding structure and a welding process for taking out broken screw rods on a manhole body of a ball mill, wherein the ball mill comprises a ball mill cylinder body, a manhole is formed in the ball mill cylinder body, a plurality of threaded holes are formed in the edges of the manhole, screw teeth are arranged on the inner sides of the threaded holes, and a plurality of broken screw rods with tops lower than the orifices of the threaded holes are connected on the inner sides of the threaded holes in a threaded manner; the welding structure comprises a T-shaped inner sleeve, a screw extension welding piece and a matched nut; the T-shaped inner sleeve is arranged in the threaded hole, the bottom of the T-shaped inner sleeve is in abutting contact with the top of the broken screw rod, and the matched screw cap is arranged on the top of the T-shaped inner sleeve; the screw extension welding piece is arranged in the inner holes of the T-shaped inner sleeve and the matched screw cap, is formed by welding wires, and the bottom and the outer side of the screw extension welding piece are respectively welded and fixed with the top of the broken bolt rod and the inner sides of the T-shaped inner sleeve and the matched screw cap. The invention can rapidly take out broken screw rods on the manhole body of the ball mill, save the running time of equipment, reduce purchasing cost, reduce long-time shutdown loss and provide guarantee for reasonable assembly of the ball mill.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding structure and a welding process for taking out broken screw rods on a manhole body of a ball mill.
Background
The ball mill is a key device for crushing materials after being crushed, and is also a core device for enterprise mineral separation, for example, a MQY4675 type ball mill, the barrel material of the ball mill is Q345, the dead weight of the ball mill is about 300T, and main components of the type ball mill body are as follows: journals, end caps, barrels, etc. As shown in fig. 1, the ball mill body comprises a ball mill cylinder 3, manholes are symmetrically designed on the ball mill cylinder 3, and workers can enter and exit the inside of the cylinder through the manholes and observe the running condition inside for a long time; screw holes 9 are symmetrically formed in the barrel body at the edge of the manhole, in order to prevent water seepage and seepage phenomena from occurring at the manhole in the production process, a manhole cover plate 7 is usually and fixedly connected with a barrel body 3 through a locking screw 8 and the screw holes 9, because a wear-resistant layer is arranged on the inner wall of the barrel body 3, the locking screw 8 is usually not connected through the barrel body, but is arranged on the barrel body 3, and due to the fact that ore grinding media and ore in the barrel body are lifted to a certain height by a barrel lining plate under the action of centrifugal force and friction force and then fall off the barrel wall freely or are thrown off, the ore is crushed under the action of impact and grinding, the broken screw 4 is higher than the barrel body due to the long-term full-load heavy-load operation, a part of the broken screw is higher than the barrel body, a new screw can be taken out and replaced by a mechanical tool, and the broken screw is arranged in the barrel body (shown in fig. 4) and cannot be taken out by the mechanical tool directly. If the broken screw is not taken out in time and the new locking screw is replaced, the manhole cover plate covers the opening of the cylinder body, so that the water seepage and material seepage situation can occur, and the production rhythm is seriously influenced. If the conventional methods of cutting, pulling by a mechanical tool, knocking by a hammer, drilling and the like are adopted for the broken screw rod in the barrel wall, the body cannot be taken out without being damaged, and then the potential safety hazard is brought to the normal production of the ball mill.
Disclosure of Invention
Aiming at the problem that broken screws in threaded holes at ball mill manholes are difficult to take out in the prior art, the invention provides a welding structure and a welding process for taking out broken screws on a ball mill manhole body, which can rapidly implement and complete the taking out of broken screws on the ball mill manhole body, save the running time of equipment, reduce the purchasing cost and reduce the long-time shutdown loss, and provide guarantee for reasonable production of the ball mill.
The technical scheme for solving the technical problems is as follows:
the invention relates to a welding structure for taking out broken screw rods on a manhole body of a ball mill, which comprises a ball mill cylinder, wherein the ball mill cylinder is provided with a manhole, the edge of the manhole is provided with a plurality of threaded holes, screw teeth are arranged on the inner sides of the threaded holes, and a plurality of broken screw rods with tops lower than the orifice of the threaded holes are in threaded connection with the inner sides of the threaded holes; the welding structure comprises a T-shaped inner sleeve, a screw extension welding piece and a matched nut; the T-shaped inner sleeve is arranged in the threaded hole, the bottom of the T-shaped inner sleeve is in abutting contact with the top of the broken screw rod, and the top of the T-shaped inner sleeve is provided with the matched screw cap; the screw extension welding piece is arranged in the inner holes of the T-shaped inner sleeve and the matched screw cap, is formed by welding wires, and the bottom and the outer side of the screw extension welding piece are respectively welded and fixed with the top of the broken bolt rod and the inner sides of the T-shaped inner sleeve and the matched screw cap.
Further, the T-shaped inner sleeve is formed by machining a steel pipe, the outer diameter of the T-shaped inner sleeve is smaller than the diameter of the broken screw, and the wall thickness of the T-shaped inner sleeve is 1.5-2 mm.
Further, the matched nut is formed by machining round steel.
Further, the inner diameter of the T-shaped inner sleeve is the same as that of the matched nut.
The invention relates to a welding process for taking out broken screw rods on a manhole body of a ball mill, which comprises a ball mill cylinder, wherein a manhole is formed on the ball mill cylinder, a plurality of threaded holes for installing a manhole cover plate through locking screw rods are formed on the edge of the manhole, screw teeth are arranged on the inner side of the threaded holes and are connected with the locking screw rods, and a plurality of locking screw rods are broken to form broken screw rods with tops lower than the orifice of the threaded holes, and the welding process is characterized in that: cleaning dirt on the top of the broken screw rod, polishing to expose metallic luster, recovering thread teeth of a threaded hole above the broken screw rod, installing a T-shaped inner sleeve in the threaded hole, welding a screw rod extension welding piece, enabling the outer side and the bottom of the screw rod extension welding piece to be fused with the T-shaped inner sleeve and the top of the broken screw rod respectively, arranging a matched nut on the top surface of the T-shaped inner sleeve, continuing to weld the screw rod extension welding piece, enabling the outer side of the screw rod extension welding piece to be firmly welded with the matched nut, locking the matched nut under the condition of not damaging a body by using a conventional adjustable wrench, and rotating the screw rod extension welding piece in the anticlockwise direction along with the T-shaped inner sleeve and the broken screw rod to be taken out from the threaded hole.
Further, the broken screw extraction mode is specifically as follows:
step one, preparing before welding:
1.1 -welding equipment: digital control inversion type manual direct current argon arc welder, wherein ER50-6 welding wires are adopted as welding materials;
1.2 A) welding position: performing flat welding;
1.3 -pre-weld requirements: greasy dirt, an oxide layer and moisture cannot exist in the welding position area, and metallic luster needs to be exposed;
1.4 And welding technical requirements: the overlaying layer is fused with the protective wire tooth inner sleeve and the bottom layer;
1.5 A weldment material): 8.8-stage high-strength screws;
1.6 -auxiliary facilities): sample plate, magnifying glass, face mask, glove, slag removing hammer, chisel, file, wire brush, sand paper, steel ruler, level bar, movable wrench, straight grinder, angle grinder, wire pliers, hacksaw blade, labor protection article;
1.7 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
step two, implementing operation:
2.1 Rotating the position with the broken screw to a horizontal position through a ball mill cylinder, removing water, oil stains and other stains at the position of the broken screw by using oxygen-acetylene flame, polishing and derusting through a abrasive cloth or a grinding grinder, cleaning the top of the broken screw by adopting an angle grinder, recovering screw teeth at the upper part of a threaded hole by adopting a manual mechanical tool after the upper surface of the broken screw is polished smoothly and the upper surface is transparent, installing a T-shaped inner sleeve matched with the threaded hole, ensuring that the bottom of the T-shaped inner sleeve is in contact with the top of the broken screw, and performing welding of screw extension welding pieces by using a digital control inversion type manual direct current argon arc welder;
2.2 When the bottom layer is welded, the welding sequence starts from the junction of the T-shaped inner sleeve and the top of the broken screw rod, the welding is sequentially operated from outside to inside in a circular shape, the welding part is preheated for 3-5 seconds at the beginning of the welding part after the electric arc is ignited, a molten pool is formed, the wire feeding is started, and the welding method is small crescent, because the welding wire gun is welded in the threaded hole, the horizontal included angle between the welding wire and the surface of the welding part is 70-90 degrees, and the horizontal included angle between the welding wire and the welding part is 80-95 degrees; after the welding of the bottom layer is finished and no welding defect is detected, performing surfacing, wherein the welding sequence is consistent with that of the bottom layer, the surfacing layer is required to fuse a T-shaped inner sleeve and control the interlayer temperature, so that the outer side of a T-shaped inner sleeve body cannot be melted to protect wire teeth, no welding defect can be generated among all layers of the surfacing layer, after the welding of the surfacing layer is prolonged out of a threaded hole, the horizontal included angle between a welding wire and the surface of a weldment is 20-35 degrees, the horizontal included angle between a welding gun and the weldment is 70-85 degrees, and the welding wire is uniformly fed, so that the integrally welded screw rod is prolonged to be cylindrical and firmly connected with the inner side of the T-shaped inner sleeve;
2.3 When the top of the screw extension welding piece to be welded is close to the top of the T-shaped inner sleeve, an angle grinder is used for grinding the outer side of the surfacing layer, then a matched screw cap is arranged on the top surface of the T-shaped inner sleeve, so that the matched screw cap corresponds to the T-shaped inner sleeve, then the welding of the screw extension welding piece is continued, the bottom layer is welded and fused with the cylindrical upper surface of the welded screw extension welding piece, the surfacing layer is fused with the inner side of the matched screw cap, the welding method, the welding sequence and the welding angle are equal to the bottom layer, so that the screw extension welding piece formed by final welding is fixedly connected with the top of the broken screw rod and the inner side of the T-shaped inner sleeve and the matched screw cap respectively;
2.4 And (3) cooling after all welding is finished, locking the matched screw cap by adopting a conventional adjustable wrench under the condition of not damaging the body, and then rotating the screw rod anticlockwise to extend the welding part, taking out the welding part together with the T-shaped inner sleeve and the broken screw rod, and delivering the welding part to use.
Further, the welding equipment is a manual direct current argon arc welder with model HT400D or HT500D digital control inversion type.
Further, during backing layer welding, an ER50-6 welding wire with the diameter of 2.0mm is adopted as the welding wire, the welding current is 90-130A, the arc voltage is 24+/-1V, and the diameter of a tungsten electrode rod is 2.0mm; during the welding of the overlay welding layer, the ER50-6 welding wire with the diameter of 3.0mm is adopted as the welding wire, the welding current is 140-160A, the arc voltage is 26+/-1V, and the diameter of the tungsten electrode rod is 2.5mm.
Compared with the prior art, the welding structure for taking out broken screw rods on the manhole body of the ball mill and the matched welding process are easy to implement, stable in welding quality and low in investment cost, the broken screw rods in threaded holes can be easily taken out under the condition that the body of the ball mill cylinder is not damaged, the actual requirements of the site are met, the working efficiency is high, the long-time shutdown loss is effectively reduced, and a powerful guarantee is provided for reasonable production of the ball mill.
Drawings
FIG. 1 is a schematic illustration of the attachment of a manhole cover plate to a bowl mill bowl in accordance with the present invention;
FIG. 2 is a schematic view of a broken screw in a threaded bore according to the present invention;
FIG. 3 is a schematic view of a welding structure according to the present invention;
FIG. 4 is a schematic view of a screw extension weld of the present invention;
in the figure: 1. a matched screw cap; 2. extending the welding piece by the screw; 3. a ball mill cylinder; 4. breaking the screw rod; 5. a T-shaped inner sleeve; 6. a thread; 7. a manhole cover plate; 8. locking the screw rod; 9. and (3) a threaded hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in the specification and claims of the present published patent application, "upper", "lower", "left", "right", "front", "rear", etc. are used only to indicate relative positional relationships, which change when the absolute position of the object to be described changes; the terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Example 1:
as shown in fig. 1 to 3, the welding structure for taking out broken screw rods on a manhole body of a ball mill comprises a ball mill cylinder 3, wherein a manhole is formed on the ball mill cylinder 3, a plurality of threaded holes 9 are formed on the edge of the manhole, screw teeth 6 for installing locking screw rods 8 are arranged on the inner side of the threaded holes 9, and a manhole cover plate 7 is installed on the ball mill cylinder 3 through the locking screw rods 8. After the ball mill runs for a long time, a plurality of locking screws 8 are broken to form broken screws 4 with the top lower than the orifice of the threaded hole 9, the broken screws 4 are connected with the inner side of the threaded hole 9 in a threaded manner, and in order to facilitate the taking out of the broken screws 4, a welding structure is designed, and the structure comprises a T-shaped inner sleeve 5, a screw extension welding piece 2 and a matched nut 1; the T-shaped inner sleeve 5 is arranged in the threaded hole 9, the bottom of the T-shaped inner sleeve is in abutting contact with the top of the broken screw rod 4, and the top of the T-shaped inner sleeve is provided with the matched screw cap 1; the screw extension welding piece 2 is arranged in the inner holes of the T-shaped inner sleeve 5 and the matched screw cap 1, is formed by welding a welding wire by manual argon arc welding, and is welded and fixed with the top of the broken bolt rod 4 and the inner sides of the T-shaped inner sleeve 5 and the matched screw cap 1 respectively at the bottom and the outer sides.
During application, stains on the top of the broken screw 4 are cleaned up, the broken screw is polished to expose metallic luster, threads 6 of a threaded hole 9 above the broken screw 4 are restored, then a T-shaped inner sleeve 5 is installed in the threaded hole 9, a welding screw extension welding piece 2 is welded, the outer side and the bottom of the screw extension welding piece 2 are respectively fused with the T-shaped inner sleeve 5 and the top of the broken screw 4, a matched nut 1 is arranged on the top surface of the T-shaped inner sleeve 5, then the welding screw extension welding piece 2 is continuously welded, the outer side of the screw extension welding piece 2 is firmly welded with the matched nut 1, the matched nut 1 is locked under the condition that a body is not damaged by a conventional adjustable wrench, and the screw extension welding piece 2, the T-shaped inner sleeve 5 and the broken screw 4 are rotated anticlockwise to be taken out from the threaded hole 9.
In this embodiment, the T-shaped inner sleeve 5 is machined by a steel pipe, the outer diameter of the T-shaped inner sleeve is smaller than the diameter of the broken screw 4, the wall thickness of the T-shaped inner sleeve is 1.5-2 mm, the T-shaped inner sleeve is internally attached to the outer side of the thread 6 to prevent the thread 6 from being damaged during welding, and the T-shaped inner sleeve 5 is vertically arranged on the upper surface of the broken screw 4 and is welded together with the screw extension welding piece 2 in a surfacing welding manner during welding.
In this embodiment, supporting nut 1 adopts round steel machining to form, and supporting nut 1 internal diameter is greater than screw rod extension weldment 2 external diameter, can satisfy the welding and install on screw rod extension weldment 2, and supporting nut 1 outside shape is 6 square, and arbitrary two planes satisfy conventional adjustable spanner and insert, convenient to detach.
In this embodiment, the T-shaped inner sleeve 5 has the same inner diameter as the mating nut 1, so as to be welded with the screw extension welding member 2.
Example 2:
as shown in fig. 1-4, according to the welding process for taking out broken screw rods on a manhole body of a ball mill, corresponding to the welding structure described in embodiment 1, the ball mill comprises a ball mill cylinder 3, a manhole is formed on the ball mill cylinder 3, a plurality of threaded holes 9 for installing a manhole cover plate 7 through locking screw rods 8 are formed on the edge of the manhole, screw teeth 6 are arranged on the inner side of the threaded holes 9 and are connected with the locking screw rods 8, and a plurality of locking screw rods 8 are broken to form broken screw rods 4 with tops lower than the orifice of the threaded holes 9; cleaning dirt on the top of the broken screw 4, polishing to expose metallic luster, recovering the thread 6 of the threaded hole 9 above the broken screw 4, installing a T-shaped inner sleeve 5 in the threaded hole 9, welding the screw extension welding piece 2, enabling the outer side and the bottom of the screw extension welding piece 2 to be fused with the top of the T-shaped inner sleeve 5 and the top of the broken screw 4 respectively, arranging a matched nut 1 on the top surface of the T-shaped inner sleeve 5, continuously welding the screw extension welding piece 2, enabling the outer side of the screw extension welding piece 2 to be firmly welded with the matched nut 1, locking the matched nut 1 under the condition of not damaging a body by using a conventional adjustable wrench, and then rotating the screw extension welding piece 2 in the anticlockwise direction along with the T-shaped inner sleeve 5 and the broken screw 4 to be taken out from the threaded hole 9.
The method comprises the following specific steps:
step one, preparing before welding:
1.1 -welding equipment: model HT400D or HT500D digital control inversion type manual DC argon arc welder, wherein the welding material is ER50-6 welding wire;
1.2 A) welding position: performing flat welding;
1.3 -pre-weld requirements: greasy dirt, an oxide layer and moisture cannot exist in the welding position area, and metallic luster needs to be exposed;
1.4 And welding technical requirements: the overlaying layer is fused with the protective wire tooth inner sleeve and the bottom layer;
1.5 A weldment material): 8.8-stage high-strength screws;
1.6 -auxiliary facilities): templates, magnifier, face mask, glove, scarfing hammer, chisel, file, wire brush, sand paper, steel ruler, level bar, movable wrench, straight grinder, angle grinder, wire pliers, hacksaw blade, labor protection articles (work clothes, shoes, caps, flat mirror);
1.7 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
manual argon tungsten-arc welding technological parameter
| Welding rod model | Welding layer | Diameter/mm of welding rod | Welding current A | Arc voltage/v | Diameter of tungsten electrode rod |
| ER50-6 | Priming layer | φ2.0mm | 90-130 | 24±1 | φ2.0mm |
| ER50-6 | Build-up welding layer | φ3.0mm | 140-160 | 26±1 | φ2.5mm |
Step two, implementing operation:
2.1 Rotating the position where the broken screw 4 exists to a horizontal position through a ball mill cylinder 3, removing water, oil stains and other stains at the position of the broken screw 4 by using oxygen-acetylene flame, polishing and derusting by using a abrasive cloth or a grinding grinder, cleaning the top of the broken screw 4 by using an angle grinder, recovering the thread 6 at the upper part of a threaded hole 9 by using a manual mechanical tool after the upper surface of the broken screw 4 is polished to be smooth and transparent, installing a T-shaped inner sleeve 5 matched with the threaded hole 9, ensuring that the bottom of the T-shaped inner sleeve 5 is in contact with the top of the broken screw 4, and then performing welding of a screw extension welding piece 2 by using a digital control inversion type manual direct current argon arc welding machine;
2.2 When the bottom layer is welded, the welding sequence starts from the junction between the T-shaped inner sleeve 5 and the top of the broken screw 4, the welding sequence is sequentially operated from outside to inside in a circular shape (the welding sequence of the welding lines 1'-4' shown in figures 3 and 4), the welding part is preheated for 3-5 seconds after the electric arc is ignited, a molten pool is formed, the wire feeding is started, the welding method is small crescent, and the welding wire gun is welded in the threaded hole 9, so that the horizontal included angle between the welding wire and the surface of the welding part is 70-90 degrees, and the horizontal included angle between the welding gun and the welding part is 80-95 degrees; after the bottom layer is welded and no welding defect is detected, surfacing is carried out, the welding sequence is consistent with that of the bottom layer (as shown as a welding seam 5 'to 16' in fig. 3), the surfacing layer is required to be fused with a T-shaped inner sleeve 5, the interlayer temperature is controlled, the outer side of a body of the T-shaped inner sleeve 5 cannot be fused to protect a wire tooth 6, no welding defect can be generated between the layers of the surfacing layer, after the welding of the surfacing layer is prolonged to the outside of a threaded hole 9, namely, when a welding gun and the like can operate outside the threaded hole, the horizontal included angle between the welding wire and the surface of a welding piece is 20-35 degrees, the horizontal included angle between the welding gun and the welding piece is 70-85 degrees, the welding wire is ensured to be fed uniformly, so that a screw rod integrally welded extends the welding piece 2 to be cylindrical and is firmly connected with the inner side of the T-shaped inner sleeve 5;
2.3 When the top of the screw extension welding piece 2 to be welded is close to the top of the T-shaped inner sleeve 5, an angle grinder is adopted to grind the outer side of the surfacing layer, then the matched screw cap 1 is arranged on the top surface of the T-shaped inner sleeve 5, so that the matched screw cap 1 corresponds to the T-shaped inner sleeve 5, then the welding of the screw extension welding piece 2 (such as welding seams 17 'to 24' in fig. 3) is continued, the bottom layer is welded and fused with the cylindrical upper surface of the welded screw extension welding piece 2, the surfacing layer is fused and fused with the inner side of the matched screw cap 1, and the welding method, the welding sequence and the welding angle are equal to the bottom layer, so that the screw extension welding piece 2 formed by final welding is fixedly connected with the top of the broken screw bolt rod 4 and the inner side of the T-shaped inner sleeve 5 and the matched screw cap 1 respectively;
2.4 And (3) cooling after all welding is finished, finally locking the matched nut 1 by adopting a conventional adjustable wrench under the condition of not damaging the body, and then rotating the screw rod counterclockwise to extend the welding part 2, taking out the welding part together with the T-shaped inner sleeve 5 and the broken screw rod 4, and delivering the welding part to use.
Claims (8)
1. The utility model provides a broken screw rod takes out welded structure on ball mill manhole body, the ball mill includes ball mill barrel (3), has seted up the manhole on ball mill barrel (3) and has seted up a plurality of screw holes (9) at the manhole border, and screw hole (9) inboard sets up screw tooth (6), and a plurality of tops are less than screw hole (9) orificess broken screw rod (4) threaded connection is inboard at screw hole (9), its characterized in that: the welding structure comprises a T-shaped inner sleeve (5), a screw extension welding piece (2) and a matched screw cap (1); the T-shaped inner sleeve (5) is arranged in the threaded hole (9), the bottom of the T-shaped inner sleeve is in abutting contact with the top of the broken screw rod (4), and the matched screw cap (1) is arranged at the top of the T-shaped inner sleeve; the screw extension welding piece (2) is arranged in the inner holes of the T-shaped inner sleeve (5) and the matched screw cap (1), is formed by welding wires, and the bottom and the outer side of the screw extension welding piece are respectively welded and fixed with the top of the broken bolt rod (4) and the inner sides of the T-shaped inner sleeve (5) and the matched screw cap (1).
2. The welded structure for taking out broken screws on a manhole body of a ball mill according to claim 1, wherein: the T-shaped inner sleeve (5) is formed by machining a steel pipe, the outer diameter of the T-shaped inner sleeve is smaller than the diameter of the broken screw rod (4), and the wall thickness of the T-shaped inner sleeve is 1.5-2 mm.
3. The welded structure for taking out broken screws on a manhole body of a ball mill according to claim 1, wherein: the matched screw cap (1) is formed by machining round steel.
4. The welded structure for taking out broken screws on a manhole body of a ball mill according to claim 1, wherein: the inner diameter of the T-shaped inner sleeve (5) is the same as that of the matched nut (1).
5. The utility model provides a welding process that broken screw rod was taken out on ball mill manhole body, the ball mill includes ball mill barrel (3), has seted up the manhole on ball mill barrel (3) and has seted up a plurality of screw holes (9) that are used for installing manhole apron (7) through locking screw (8) at the manhole border, and screw hole (9) inboard sets up screw tooth (6) and is connected with locking screw (8), and a plurality of locking screw (8) fracture forms broken screw rod (4) that the top is less than screw hole (9) drill way, its characterized in that: cleaning dirt on the top of a broken screw rod (4), polishing to expose metallic luster, recovering a thread (6) of a threaded hole (9) above the broken screw rod (4), installing a T-shaped inner sleeve (5) in the threaded hole (9), welding a screw rod extension welding piece (2), enabling the outer side and the bottom of the screw rod extension welding piece (2) to be fused with the top of the T-shaped inner sleeve (5) and the top of the broken screw rod (4) respectively, arranging a matched nut (1) on the top surface of the T-shaped inner sleeve (5), continuing to weld the screw rod extension welding piece (2) and enabling the outer side of the screw rod extension welding piece (2) to be firmly welded with the matched nut (1), locking the matched nut (1) by using a conventional adjustable wrench under the condition of not damaging a body, and taking out the screw rod extension welding piece (2) together with the T-shaped inner sleeve (5) and the broken screw rod (4) from the threaded hole (9).
6. The welding process for taking out broken screws on a manhole body of a ball mill according to claim 5, wherein the welding process comprises the following steps: the taking-out mode of the broken screw rod (4) is specifically as follows:
step one, preparing before welding:
1.1 -welding equipment: digital control inversion type manual direct current argon arc welder, wherein ER50-6 welding wires are adopted as welding materials;
1.2 A) welding position: performing flat welding;
1.3 -pre-weld requirements: greasy dirt, an oxide layer and moisture cannot exist in the welding position area, and metallic luster needs to be exposed;
1.4 And welding technical requirements: the overlaying layer is fused with the protective wire tooth inner sleeve and the bottom layer;
1.5 A weldment material): 8.8-stage high-strength screws;
1.6 -auxiliary facilities): sample plate, magnifying glass, face mask, glove, slag removing hammer, chisel, file, wire brush, sand paper, steel ruler, level bar, movable wrench, straight grinder, angle grinder, wire pliers, hacksaw blade, labor protection article;
1.7 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
step two, implementing operation:
2.1 Rotating the position where the broken screw (4) exists to a horizontal position through a ball mill cylinder (3), removing water, oil stains and other stains at the position of the broken screw (4) by using oxygen-acetylene flame, polishing and derusting through a abrasive cloth or a grinding grinder, cleaning the top of the broken screw (4) by adopting an angle grinder, recovering a thread (6) at the upper part of a threaded hole (9) by adopting a manual mechanical tool after the upper surface of the broken screw (4) is polished flat and transparent, installing a T-shaped inner sleeve (5) matched with the threaded hole (9), ensuring that the bottom of the T-shaped inner sleeve (5) is propped against the top of the broken screw (4), and then performing welding of a screw extension welding piece (2) through a digital control inversion type manual direct current argon arc welding machine;
2.2 When the bottom layer is welded, the welding sequence starts from the junction of the T-shaped inner sleeve (5) and the top of the broken screw rod (4), the welding is sequentially operated from outside to inside in a circular shape, the welding part is preheated for 3-5 seconds after the electric arc is ignited, a molten pool is formed, wire feeding is started, the welding method is small crescent, and the welding wire is welded in the threaded hole (9), so that the horizontal included angle between the welding wire and the surface of the welding part is 70-90 degrees, and the horizontal included angle between the welding wire and the welding part is 80-95 degrees; after the welding of the bottom layer is finished and no welding defect is detected, performing surfacing, wherein the welding sequence is consistent with that of the bottom layer, the surfacing layer is required to be fused with the T-shaped inner sleeve (5) and control the interlayer temperature, so that the outer side of the T-shaped inner sleeve (5) body cannot be fused to protect the screw thread (6), no welding defect can be generated between the layers of the surfacing layer, after the welding of the surfacing layer is prolonged to the outside of the threaded hole (9), the horizontal included angle between the welding wire and the surface of a weldment is 20-35 degrees, the horizontal included angle between the welding gun and the weldment is 70-85 degrees, and the welding wire is ensured to be fed uniformly, so that the integrally welded screw extension weldment (2) is cylindrical and is firmly connected with the inner side of the T-shaped inner sleeve (5);
2.3 When the top of the screw extension welding piece (2) to be welded is close to the top of the T-shaped inner sleeve (5), an angle grinder is used for grinding the outer side of the surfacing layer, then the matched screw cap (1) is arranged on the top surface of the T-shaped inner sleeve (5) so that the matched screw cap (1) corresponds to the T-shaped inner sleeve (5), then the welding of the screw extension welding piece (2) is continued, the bottom layer is welded and fused with the welded cylindrical upper surface of the screw extension welding piece (2), the inner side of the matched screw cap (1) is fused and fused with the surfacing layer, the welding method, the welding sequence and the welding angle are equal to the bottom layer, and the screw extension welding piece (2) formed by final welding is fixedly connected with the top of the broken bolt rod (4) and the inner side of the T-shaped inner sleeve (5) and the matched screw cap (1);
2.4 And (3) cooling after all welding is finished, locking the matched screw cap (1) by adopting a conventional adjustable wrench under the condition of not damaging the body, and then taking out the welding part (2) together with the T-shaped inner sleeve (5) and the broken screw (4) by rotating the screw in the anticlockwise direction for delivery.
7. The welding process for taking out broken screws on a manhole body of a ball mill according to claim 6, wherein: the welding equipment is a manual direct current argon arc welder with model HT400D or HT500D digital control inversion type.
8. The welding process for taking out broken screws on a manhole body of a ball mill according to claim 6, wherein: when the priming layer is welded, the welding wire adopts ER50-6 welding wire with the diameter of 2.0mm, the welding current is 90-130A, the arc voltage is 24+/-1V, and the diameter of the tungsten electrode rod is 2.0mm; during the welding of the overlay welding layer, the ER50-6 welding wire with the diameter of 3.0mm is adopted as the welding wire, the welding current is 140-160A, the arc voltage is 26+/-1V, and the diameter of the tungsten electrode rod is 2.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310511767.XA CN116475536A (en) | 2023-05-08 | 2023-05-08 | Welding structure and process for taking out broken screw on manhole body of ball mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310511767.XA CN116475536A (en) | 2023-05-08 | 2023-05-08 | Welding structure and process for taking out broken screw on manhole body of ball mill |
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| Publication Number | Publication Date |
|---|---|
| CN116475536A true CN116475536A (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310511767.XA Pending CN116475536A (en) | 2023-05-08 | 2023-05-08 | Welding structure and process for taking out broken screw on manhole body of ball mill |
Country Status (1)
| Country | Link |
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| CN (1) | CN116475536A (en) |
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- 2023-05-08 CN CN202310511767.XA patent/CN116475536A/en active Pending
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