CN217596253U

CN217596253U - Online surfacing auxiliary heating device for stepped hole of rolling mill pressing mechanism

Info

Publication number: CN217596253U
Application number: CN202221211113.2U
Authority: CN
Inventors: 周伟文; 熊佑发; 侯莉庆; 张利明; 董长富
Original assignee: Maanshan Iron and Steel Co Ltd
Current assignee: Maanshan Iron and Steel Co Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-10-18
Anticipated expiration: 2032-05-18

Abstract

The utility model provides a be applied to rolling mill of steel smelting rolling mill technical field and press mechanism shoulder hole on-line build-up welding auxiliary heating device, rolling mill press mechanism shoulder hole on-line build-up welding auxiliary heating device's heating cage I (1) including heating cage frame I (3), a plurality of couples of outer lane welding I (4) of heating cage frame I (3), hang track heating plate I (5) on couple I (4), heating cage II (2) including heating cage frame II (6), a plurality of couples of outer lane welding II (7) of heating cage frame II (6), hang track heating plate II (8) on couple II (7). Rolling mill press mechanism shoulder hole build-up welding auxiliary heating device on line, simple structure when the online build-up welding of shoulder hole is restoreed, can overcome the big heat-conduction of weldment volume weight and the radiating defect of heat radiation, reliably realize on-the-spot heating, accuse temperature, heat preservation, satisfy build-up welding process requirement.

Description

Online surfacing auxiliary heating device for stepped hole of rolling mill pressing mechanism

Technical Field

The utility model belongs to the technical field of the steel smelting rolling mill, more specifically say, relate to a rolling mill presses mechanism shoulder hole on-line build-up welding auxiliary heating device on.

Background

The universal rolling mill is important production equipment of an H-shaped steel production line, a pressing screw rod pair of a pressing mechanism of the pressing mechanism consists of a copper nut, a pressing screw rod and a transmission turbine box, the copper nuts on a transmission side and an operation side are respectively installed in stepped holes of housing bases on the transmission side and the operation side of the rolling mill, and the stepped holes are located at the bottom of the rolling mill, so that heavy load work is carried out in severe environment for a long time, the nut stepped holes on the housing are abraded in different degrees in the aspects of diameter and depth due to abrasion and corrosion, the size is unqualified, the copper nuts are deflected after being installed, the copper nuts are displaced in the housing installation holes in the rolling process to cause crushing deformation of the copper nuts, and faults occur repeatedly to influence production.

In consideration of the strength of the rolling mill, additive surfacing is required when reaming and repairing are not suitable. And (4) ensuring that MT and PT penetration flaw detection has no crack and no pore defect, and then machining by a line machine to recover the dimension and precision of the drawing. The main material increase part of the drawing size of the stepped hole is an upper stepped hole. The rolling mill housing body is made of cast steel ZG20SiMn, and the material has better weldability. The main problems with welding are, however: (1) the occurrence of weld cracks is liable to occur. Thermal cracking is almost impossible to occur, but cold cracking is not negligible. The requirements for cold cracking are the concentration of hydrogen and the presence of a hardened structure, which requires heat treatment after welding to relieve the weld stress. And (2) tearing the layer. The phenomenon mainly comes from factors of welding Z-direction restraint force and heat affected zone hardening, and the Z-direction restraint force is reduced in the welding process, and preheating and welding heat input control can be selected. (3) embrittlement of heat-affected zone: embrittlement of a hot spot: the cooling rate of austenite is too fast in the region above 1100 ℃, and partial widmanstatten is generated to cause the sharp reduction of toughness. Thermal strain embrittlement: the body material is easy to generate notch sensitivity due to higher solid-melt N, so the influence of thermal strain embrittlement can be effectively eliminated after welding for 6 hours at 550-600 ℃.

In summary, the key of the on-line repair is preheating before welding, heat control during welding, and stress-relief heat-preservation treatment after welding. Because the total weight of the single housing of the rolling mill is 62.5 tons, the single housing is difficult to disassemble on site, the single housing must be subjected to on-site surfacing, the volume and the weight are large, and the heating mode can reach the temperature required by the welding process or not and the heat preservation duration and the effect can meet the requirements or not because the heat conduction and the heat radiation are effective in the heating process. Whether the on-site environment is safe and reliable or not, how to ensure that the relevant influence on the rolling mill body and the periphery is small in the heating process, particularly whether the influence on the rolling mill foundation and foundation bolts is small or not is the main consideration in process formulation. At present, on-line surfacing repair of a mill housing is carried out aiming at plane repair of the side face of the bottom of a mill housing window in many documents, but large-area welding is carried out on a step hole at the bottom of a mill, residual stress concentration after welding of the step hole is avoided, the requirements on heating and temperature control are high, and the heat preservation time is long. The welding process with the auxiliary heating device also needs to ensure the machinability after welding, and no relevant record exists.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: aiming at the defects of the prior art, the auxiliary heating device for online overlaying welding of the stepped hole of the rolling mill pressing mechanism is simple in structure, can overcome the defects of large volume and weight of a weldment, large heat conduction and heat radiation when the stepped hole is subjected to online overlaying welding repair, reliably realizes field heating, temperature control and heat preservation, and meets the requirements of an overlaying welding process.

To solve the technical problem, the utility model discloses the technical scheme who takes does:

the utility model relates to a rolling mill is pressed mechanism shoulder hole on-line build-up welding auxiliary heating device on, including heating cage I and heating cage II, heating cage I is including heating cage frame I, and I outer lane welding of heating cage frame a plurality of couples I, and I upward hanging track heating plate I of couple, heating cage II are including heating cage frame II, and II outer lane welding of heating cage frame a plurality of couples II, and II upward hanging track heating plate II of couple.

And an inner ring of a heating cage frame I of the heating cage I is provided with an asbestos blanket layer I.

And an asbestos blanket layer II is arranged on the inner ring of the heating cage frame II of the heating cage II.

Heating cage frame I include that upper portion circle I and lower part circle I, upper portion circle I and lower part circle between I welding multichannel connecting rod I, I outside from the top down of every connecting rod sets up a plurality of couples I according to the clearance.

Heating cage frame II include upper portion circle II and lower part circle II, weld multichannel connecting rod II between upper portion circle II and the lower part circle II, II outside from the top down of every connecting rod set up a plurality of couples II according to the clearance.

I outer lane suit multichannel track heating plate I of connecting rod of heating cage frame I, multichannel connecting rod I is located and sets up track heating plate I one on couple I of same height.

II outer lane suits multichannel track heating plate II of connecting rod of heating cage frame II, multichannel connecting rod II is located and sets up track heating plate II one on couple II of co-altitude.

The rolling mill pressing mechanism stepped hole on-line surfacing auxiliary heating device further comprises an upper asbestos blanket layer.

The rolling mill pressing mechanism stepped hole on-line surfacing auxiliary heating device further comprises a lower asbestos blanket layer.

The heating suspension cage I and the heating suspension cage II are arranged into structures capable of being placed in a stepped hole of a rolling mill pressing mechanism; when the heating cage I and the heating cage II are placed in the stepped hole of the rolling mill pressing mechanism; heating cage I sets up to be located the structure of II top positions on the heating cage, and II bottoms on the heating cage set up lower part asbestos blanket layer, and I upper portion on the heating cage sets up upper portion asbestos blanket layer.

Adopt the technical scheme of the utility model, theory of operation and beneficial effect are as follows:

rolling mill press mechanism shoulder hole on-line build-up welding auxiliary heating device, press mechanism shoulder hole on-line build-up welding auxiliary heating when needs to the rolling mill, the auxiliary heating device that the mechanism shoulder hole corresponds is pressed to the preparation and rolling mill, auxiliary heating device comprises two upper and lower cages, lower part cage diameter size is less than upper portion cage diameter size. To heating cage I, couple I is used for hanging track heating plate I, and the centre is filled the heat preservation of asbestos blanket. For the heating suspension cage II, the hook II is used for hanging a track heating sheet, and the middle of the heating suspension cage II is filled with an asbestos blanket for heat preservation. The current of each track heating plate externally connected with a power box is adjustable. When heating, two large and small suspension cages are respectively suspended into the stepped hole, the outer vertical surface of the heating cage heats the inner wall of the stepped hole to be welded through the heating sheet suspended on the heating cage, and the upper hole and the lower hole of the stepped hole are covered and blocked by asbestos plates. The outside of the stepped hole is also covered with an asbestos blanket. After the preheating to the set temperature, the auxiliary equipment and the suspension cage at the upper hole are removed, the suspension cage at the lower hole keeps the heating state, and meanwhile, the upper hole carries out the deposition welding operation. In order to ensure the interlayer temperature in the welding process and ensure that the temperature of the welding part is not reduced in a heat transfer mode, the upper part of the welding part can also be covered with an upper asbestos blanket layer if necessary. Therefore, the requirement of online heating of the stepped hole of the rolling mill pressing mechanism is effectively met, and the convenience of field operation is effectively improved. Rolling mill press mechanism shoulder hole on-line build-up welding auxiliary heating device, simple structure when shoulder hole on-line build-up welding is restoreed, can overcome the big heat-conduction of weldment volume weight and heat radiation radiating defect, reliably realize on-the-spot heating, accuse temperature, keep warm, satisfy build-up welding process requirement.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic structural view of a cage of the on-line overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism of the present invention;

fig. 2 is a schematic structural view of the online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism of the present invention when the online overlaying auxiliary heating device is placed in the stepped hole of the rolling mill pressing mechanism;

in the drawings, the symbols are respectively: 1. heating the suspension cage I; 2. heating the suspension cage II; 3. heating the suspension cage frame I; 4. a hook I; 5. a track heating plate I; 6. heating the suspension cage frame II; 7. a hook II is hooked; 8. a track heating plate II; 9. a asbestos blanket layer I; 10. a asbestos blanket layer II; 11. an upper ring I; 12. a lower ring I; 13. a connecting rod I; 14. an upper ring II; 15. a lower ring II; 16. a connecting rod II; 17. an upper asbestos blanket layer; 18. a lower asbestos blanket layer; 19. the rolling mill presses the mechanism shoulder hole on.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes, structures, mutual positions and connection relations of the components, the functions and operation principles of the components, and the like:

as shown in attached figure 1 and attached figure 2, the utility model relates to a rolling mill is pressed mechanism shoulder hole and is built up welding auxiliary heating device on line, including heating cage I1 and heating cage II 2, heating cage I1 is including heating cage frame I3, and I3 outer lane welding of heating cage frame a plurality of couples I4, hangs track heating plate I5 on the couple I4, and heating cage II 2 is including heating cage frame II 6, and II 6 outer lane welding of heating cage frame a plurality of couples II 7, hangs track heating plate II 8 on the couple II 7. The structure provides an improved technical scheme aiming at the defects in the prior art. When the step hole of the rolling mill pressing mechanism needs to be subjected to on-line surfacing auxiliary heating, an auxiliary heating device corresponding to the step hole of the rolling mill pressing mechanism is manufactured, the auxiliary heating device consists of an upper suspension cage and a lower suspension cage, and the diameter of the lower suspension cage is smaller than that of the upper suspension cage. To heating cage I1, couple I is used for hanging track heating plate I, and the centre is filled the heat preservation of asbestos blanket. For the heating suspension cage II 2, the hook II is used for hanging a track heating plate, and the middle of the heating suspension cage is filled with an asbestos blanket for heat preservation. The power of each track heating plate is 10KW, and the current of the external power box is adjustable. When heating, two large and small suspension cages are respectively suspended into the stepped hole, the outer vertical surface of the heating cage heats the inner wall of the stepped hole to be welded through the heating sheet suspended on the heating cage, and the upper hole and the lower hole of the stepped hole are covered and blocked by asbestos plates. The outside of the stepped hole is also covered with an asbestos blanket. After the preheating to the set temperature, the auxiliary equipment and the suspension cage at the upper hole are removed, the suspension cage at the lower hole keeps the heating state, and meanwhile, the upper hole carries out the deposition welding operation. In order to ensure the interlayer temperature and the temperature of the welding part not to be reduced in the welding process by a heat transfer mode, the upper asbestos blanket layer can be covered on the welding part if necessary. Therefore, the requirement of online heating of the stepped hole of the rolling mill pressing mechanism is effectively met. Rolling mill press mechanism shoulder hole build-up welding auxiliary heating device on line, simple structure when the online build-up welding of shoulder hole is restoreed, can overcome the big heat-conduction of weldment volume weight and the radiating defect of heat radiation, reliably realize on-the-spot heating, accuse temperature, heat preservation, satisfy build-up welding process requirement.

The inner ring of the heating suspension cage frame I3 of the heating suspension cage I1 is provided with a asbestos blanket layer I9. Above-mentioned structure, the setting of asbestos blanket layer I9 plays the heat preservation effect, avoids the heat to run off too fast.

And an asbestos blanket layer II 10 is arranged on the inner ring of the heating cage frame II 6 of the heating cage II 2. Above-mentioned structure, the setting of asbestos blanket II 10 plays the heat preservation effect, avoids the heat to run off at the excessive speed.

Heating cage frame I3 include that upper portion circle I11 and lower part circle I12, upper portion circle I11 and lower part circle weld multichannel connecting rod I13 between I12, every I13 outside from the top down of connecting rod sets up a plurality of couples I4 according to the clearance. On every couple I4 respectively the hook heating plate I, and along I a week of cage, set up a plurality of heating plates I, form heating plate subassembly I, along I from the top down of cage, can set up many rings of heating plate subassemblies I, realize that the heating covers comprehensively.

Heating cage frame II 6 include upper portion circle II 14 and lower part circle II 15, weld multichannel connecting rod II 16 between upper portion circle II 14 and the lower part circle II 15, every II 16 outsides of connecting rod from the top down according to a plurality of couples II 7 of clearance setting. Hook heating plate II respectively on every couple II 7, and along II a week of cage, set up a plurality of heating plates II, form heating plate subassembly II, and along II from the top down of cage, can set up many rings of heating plate subassembly II, realize that the heating covers comprehensively.

Heating cage frame I3's connecting rod I13 outer lane suit multichannel track heating plate I5, multichannel connecting rod I13 is located and sets up one track heating plate I5 on I4 of couple of co-altitude. The structure can be used as another embodiment, each heating sheet assembly I can be connected together and arranged around the suspension cage I, and the heating effect is further improved.

II 16 outer lane suits multichannel track heating plate II 8 of connecting rod of heating cage frame II 6, multichannel connecting rod II 16 is located and sets up track heating plate II 8 on II 7 of couple of co-altitude. The structure can be used as another embodiment, each heating plate assembly II can be connected together and arranged around the suspension cage II, and the heating effect is further improved.

The rolling mill pressing mechanism stepped hole on-line surfacing auxiliary heating device further comprises an upper asbestos blanket layer 17. The on-line overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism further comprises a lower asbestos blanket layer 18. With the structure, the upper asbestos blanket layer 17 and the lower asbestos blanket layer 18 effectively play a role in heat preservation. When the online surfacing auxiliary heating of the stepped hole of the rolling mill pressing mechanism is carried out, the heating suspension cage I1 and the heating suspension cage II 2 are set to be structures which can be placed in the stepped hole 19 of the rolling mill pressing mechanism; when the heating suspension cage I1 and the heating suspension cage II 2 are placed in the stepped hole 19 of the pressing mechanism of the rolling mill; heating cage I1 sets up to be located the structure of heating cage II 2 top position, and heating cage II 2 bottom sets up lower part asbestos blanket layer 18, and heating cage I1 upper portion sets up upper portion asbestos blanket layer 17. Therefore, the requirement of subsequent on-line surfacing operation is effectively met.

Rolling mill press mechanism shoulder hole on-line build-up welding auxiliary heating device, press mechanism shoulder hole on-line build-up welding auxiliary heating when needs to the rolling mill, the auxiliary heating device that the mechanism shoulder hole corresponds is pressed to the preparation and rolling mill, auxiliary heating device comprises two upper and lower cages, lower part cage diameter size is less than upper portion cage diameter size. To heating cage I, couple I is used for hanging track heating plate I, and the centre is filled the heat preservation of asbestos blanket. For the heating suspension cage II, the hook II is used for hanging a track heating sheet, and the middle of the heating suspension cage II is filled with an asbestos blanket for heat preservation. The current of each track heating plate externally connected with a power box is adjustable. When heating, two large and small suspension cages are respectively suspended into the stepped hole, the outer vertical surface of the heating cage heats the inner wall of the stepped hole to be welded through the heating sheet suspended on the heating cage, and the upper hole and the lower hole of the stepped hole are covered and blocked by asbestos plates. The outside of the stepped hole is also covered with an asbestos blanket. After the preheating to the set temperature, the auxiliary equipment and the suspension cage at the upper hole are removed, the suspension cage at the lower hole is continuously kept in a heating state, and meanwhile, the upper hole is subjected to fusion welding operation. In order to ensure the interlayer temperature and the temperature of the welding part not to be reduced in the welding process by a heat transfer mode, the upper asbestos blanket layer can be covered on the welding part if necessary. Therefore, the requirement of online heating of the stepped hole of the pressing mechanism of the rolling mill is effectively met, and the convenience of field operation is effectively improved. Rolling mill press mechanism shoulder hole on-line build-up welding auxiliary heating device, simple structure when shoulder hole on-line build-up welding is restoreed, can overcome the big heat-conduction of weldment volume weight and heat radiation radiating defect, reliably realize on-the-spot heating, accuse temperature, keep warm, satisfy build-up welding process requirement.

The present invention has been described in detail with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and the present invention can be implemented in various ways without modification, and the present invention is not limited by the above embodiments.

Claims

1. The utility model provides a rolling mill is pressed mechanism shoulder hole on-line surfacing auxiliary heating device which characterized in that: including heating cage I (1) and heating cage II (2), heating cage I (1) is including heating cage frame I (3), heating cage frame I (3) outer lane welding a plurality of couples I (4), hang track heating plate I (5) on couple I (4), heating cage II (2) is including heating cage frame II (6), heating cage frame II (6) outer lane welding a plurality of couples II (7), hang track heating plate II (8) on couple II (7).

2. The rolling mill press-on mechanism stepped hole on-line surfacing auxiliary heating device according to claim 1, characterized in that: and an asbestos blanket layer I (9) is arranged at the inner ring of the heating suspension cage frame I (3) of the heating suspension cage I (1).

3. The online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism according to claim 1, characterized in that: and an asbestos blanket layer II (10) is arranged on the inner ring of the heating cage frame II (6) of the heating cage II (2).

4. The online overlaying auxiliary heating device for the stepped holes of the rolling mill pressing mechanism according to claim 1 or 2, characterized in that: heating cage frame I (3) including upper portion circle I (11) and lower part circle I (12), weld multichannel connecting rod I (13) between upper portion circle I (11) and lower part circle I (12), every I (13) outside from the top down of connecting rod sets up a plurality of couples I (4) according to the clearance.

5. The online overlaying auxiliary heating device for the stepped holes of the rolling mill pressing mechanism according to claim 1 or 3, characterized in that: heating cage frame II (6) including upper portion circle II (14) and lower part circle II (15), upper portion circle II (14) and lower part circle II (15) between the welding multichannel connecting rod II (16), every channel connecting rod II (16) outside from the top down according to clearance setting a plurality of couples II (7).

6. The online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism according to claim 4, wherein the device comprises: connecting rod I (13) outer lane suit multichannel track heating plate I (5) of heating cage frame I (3), multichannel connecting rod I (13) are located and set up one track heating plate I (5) on same high couple I (4).

7. The online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism according to claim 5, wherein the device comprises: connecting rod II (16) outer lane suit multichannel track heating plate II (8) of heating cage frame II (6), multichannel connecting rod II (16) are located and set up one track heating plate II (8) on same high couple II (7).

8. The online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism according to claim 1, characterized in that: the online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism further comprises an upper asbestos blanket layer (17).

9. The online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism according to claim 8, wherein: the online overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism further comprises a lower asbestos blanket layer (18).

10. The on-line overlaying auxiliary heating device for the stepped hole of the rolling mill pressing mechanism according to claim 9, wherein: the heating suspension cage I (1) and the heating suspension cage II (2) are arranged into structures which can be placed in a stepped hole (19) of a rolling mill pressing mechanism; when the heating cage I (1) and the heating cage II (2) are placed in the stepped hole (19) of the rolling mill pressing mechanism; heating cage I (1) sets up to be located the structure of heating cage II (2) top position, and heating cage II (2) bottom sets up lower part asbestos blanket layer (18), and heating cage I (1) upper portion sets up upper portion asbestos blanket layer (17).