CN218575226U - Surface strengthening surfacing device for eccentric shaft of rolling mill - Google Patents

Abstract

The utility model discloses a surface strengthening surfacing device for an eccentric mandrel of a rolling mill, which comprises a structural part fixing tool, an upper semicircular movable clamping plate and a heating tool; the fixed frock of structure includes the bottom plate, bottom plate upper surface center department is provided with fixed round platform, its upper surface is the fixed four supports that are provided with in slant inboard top all around, two fixed link that are provided with in support top of every one side, the fixed semicircle is fixed to be provided with between two link one sides leans on the frame, can dismantle between the opposite side and be provided with first semicircle movable clamp plate, the fixed frame that leans on of last semicircle and the inboard corresponding half slot of having seted up of last semicircle movable clamp plate, wherein be provided with down the fixed frame that leans on of semicircle between the middle part of two supports of one side, the fixed frame inboard of leaning on of lower semicircle has seted up the half slot. The utility model discloses not only the investment cost is low, and field operation maintains conveniently, and repair time is short, and partial core axle can effectively satisfy rolling operation to use after the build-up welding is restoreed moreover.

Description

Surface strengthening surfacing device for eccentric shaft of rolling mill

Technical Field

The utility model belongs to the field of machinery, a rolling mill eccentric core axle surface strengthening build-up welding device is related to.

Background

At present, the ring production process of various specifications of steel enterprises is that a qualified raw material steel ingot is cut into required length by sections through a machine tool, the cut steel ingot is heated to reach the process temperature by a heating annular furnace, is clamped to a hydraulic press for upsetting and punching through a movable manipulator, and is clamped to punch through a fixed manipulator and then is sent to a ring rolling mill for rolling and forming. The ring roughing mill mainly comprises a vertical rotary eccentric shaft, an upper inclined roller shaft and a lower inclined roller shaft which can horizontally move, a holding roller and the like, wherein the vertical rotary eccentric shaft and the holding roller mainly control the wall thickness and the diameter of a ring, the upper inclined roller shaft and the lower inclined roller shaft which can horizontally move control the axial height of the ring, the vertical rotary eccentric shaft is irregular (such as the eccentric shaft 2 in figure 2), a vertical hoisting notch 22 is arranged at the top, and the rest is an irregular shaft body, the shaft body mainly comprises a body, a transition layer is arranged outside the body, and a wear-resistant alloy surface layer is arranged outside the transition layer. For the worn eccentric shaft, if new spare parts are continuously replaced, a large amount of purchase cost is needed, and if the eccentric shaft is off-line transported to a manufacturer for repair, the repair period is long, the orderly production is influenced, and the eccentric shaft cannot meet the requirements of heavy production task and time tightening of a hoop production line and continuous development of new products; if the worn eccentric shaft is repaired by welding, the following difficulties mainly exist: 1. the shape of the eccentric shaft of the rolling mill is irregular, and the eccentric shaft cannot be placed or rotatably welded through a normal tool; 2. in the welding process, the welding defects such as abrasion and falling of the surface of a eccentric shaft of a ring roughing mill of a ring rolling mill are overcome by strictly controlling key process parameters such as welding line energy, fusion ratio, preheating, postheating, interlayer temperature, metallurgical bonding of a base metal, a transition layer and a welding bead of a base layer adjacent to a hard alloy, filling thickness and the like during welding construction. In addition, the eccentric shaft surface of the ring roughing mill after welding repair also needs to meet the following requirements: 1. the local part is ground manually and machined integrally, and the running size is reached through the inspection of a conforming sample plate; 2. the metallurgically bonded welding layer meets the requirement of periodic use; 3. the repaired eccentric shaft can ensure the running rolling quality.

SUMMERY OF THE UTILITY MODEL

To the problem that exists in the background art, the utility model provides a rolling mill inclined to one side dabber surface strengthening build-up welding device and repair technology, not only the investment cost is low, and field operation maintains conveniently, and repair time is short, and inclined to one side dabber can effectively satisfy rolling operation and use after the build-up welding is restoreed moreover.

The utility model provides a technical problem's technical scheme as follows:

the utility model relates to a surface strengthening surfacing device for an eccentric mandrel of a rolling mill, which comprises a structural part fixing tool, an upper semicircular movable clamping plate and a heating tool; the fixed frock of structure includes the bottom plate, bottom plate upper surface center department is provided with fixed round platform, its upper surface is the fixed four supports that are provided with in slant inboard top all around, two fixed link that are provided with in support top of every one side, the fixed semicircle is fixed to be provided with between two link one sides leans on the frame, can dismantle between the opposite side and be provided with first semicircle movable clamp plate, the fixed frame that leans on of last semicircle and the inboard corresponding half slot of having seted up of last semicircle movable clamp plate, wherein be provided with down the fixed frame that leans on of semicircle between the middle part of two supports of one side, the fixed frame inboard of leaning on of lower semicircle has seted up the half slot.

Furthermore, a ladder stand is fixedly arranged between the end part of the same side of the two connecting frames and the bottom plate.

Further, a handrail is arranged on the outer side of the crawling ladder.

Furthermore, a supporting plate is arranged between the bottom of the lower semicircular fixing leaning frame and the upper surface of the bottom plate.

Furthermore, a rotating shaft is arranged on one connecting frame connected with the upper semicircular movable clamping plate, a fixed hole is formed in the other connecting frame, through holes matched with the rotating shaft and the fixed hole are respectively formed in the positions, corresponding to the rotating shaft and the fixed hole, of the upper semicircular movable clamping plate, a through hole at one end of the upper semicircular movable clamping plate is sleeved on the rotating shaft and can rotate by taking the rotating shaft as the center of a circle, and the other side of the upper semicircular movable clamping plate penetrates through the through hole at the side through hole through a movable pin to be connected and fixed with the fixed hole.

Further, the heating tool comprises a plurality of annular branch pipes which are arranged at equal intervals from top to bottom and communicated through a plurality of communicating pipes, a fuel gas inlet pipe is connected to one of the annular branch pipes, and a plurality of burners are uniformly arranged on the circumference of the inner side of each annular branch pipe.

The utility model relates to a repair technology of a surface strengthening surfacing device of a rolling mill eccentric mandrel based on the technical proposal, a vertical lifting notch is arranged at the top of the eccentric mandrel, the upper part is a wear or shedding surface, firstly, an integral frame of a structural part fixing tool is processed and manufactured according to the specification of the eccentric mandrel, then, a round platform is welded and fixed on a bottom plate, a lower semicircle fixing leaning frame is welded and fixed through the position of the fixed round platform and the position of the eccentric mandrel when being vertically placed, then, a semicircle fixing leaning frame, a rotating shaft and a fixed hole are welded and installed on two connecting frames according to the position of the eccentric mandrel when being vertically placed, and a semicircle movable clamping plate is installed outside the rotating shaft, then weld installation cat ladder and handrail again, adopt wire rope at last through the perpendicular handling slotted hole of eccentric spindle with clear up the eccentric spindle of wearing and tearing or shedding face hoist and transport to the inside of the fixed frock of structure, the tip inserts in the fixed round platform under the eccentric spindle, the intermediate position is fixed through the fixed backing frame of semicircle down, upper portion is near in the fixed backing frame semicircular groove of semicircle, rotate the movable splint of semicircle again and press from both sides tight eccentric spindle upper portion and lock it with the link through removable pin 4, install the wearing and tearing or the shedding face position on eccentric spindle surface with the heating frock again at last, then can carry out the heating welding and repair, concrete technology is as follows:

s1, preparation before welding:

1.1 And welding equipment: digitally controlling the inverse manual shielded metal arc welding and argon arc welding and using a direct current welding machine; the surface layer of the wear-resistant alloy is welded by a D256 welding rod; the welding of the transition layer adopts HS1Cr18Ni9Ti welding wires, and the purity of argon is more than or equal to 99.999 percent;

1.2 A heating device: heating the tool;

1.3 Auxiliary facilities): an angle grinder, a file, a hand hammer, a flat shovel, a mask, a sample plate, a thermodetector, a magnifier and heat-insulating cotton;

1.4 Raw materials of weldments): the wear-resistant alloy comprises a body 40CrNiMoA, transition layer stainless steel HS1Cr18Ni9Ti and an outer wear-resistant alloy surface layer;

1.5 And surfacing before welding requires: removing various defects on the surface of the eccentric shaft needing surfacing by machining, and confirming that cracks are removed by adopting dye penetrant inspection;

1.6 Host), welding position: vertically overlaying;

1.7 And welding requirements: all welding layers must be free of any welding defects and fused to the base material;

1.8 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;

s2, welding implementation:

2.1 Uniformly preheating a worn or falling surface to a set temperature from outside to inside by adopting a gas heating mode through a heating tool, and then sequentially welding a transition layer and a surface surfacing layer;

2.2 In normal welding, the interlayer temperature of the welding seam is strictly controlled not to be lower than the preheating temperature no matter in the transition layer or the surface overlaying layer; the transition layer is symmetrically welded in sections, the transition layer is divided into a plurality of symmetrical areas to be welded along the circumference, and each symmetrical area to be welded is synchronously welded vertically; the surface overlaying layer adopts overlaying from bottom to top in a circle;

2.3 After the whole abrasion of the surface of the eccentric shaft or the whole surfacing of the shedding surface is finished, performing heat treatment on a welding area from outside to inside for 6 hours at 400-550 ℃ by using a heating tool to eliminate welding stress, slowly cooling to 250 ℃, then integrally covering by using heat-insulating cotton, and cooling to room temperature;

2.4 Hoisting the eccentric shaft away from the structural part fixing tool, detecting and detecting defects, confirming that the eccentric shaft has no defects, machining a welding seam of eccentric shaft wear surface overlaying welding, comparing by adopting a sample plate manufactured firstly, and recovering the use tolerance size.

Further, the direct current welding machine for digital control of the inverse manual shielded metal arc welding and argon arc welding is HT400D or HT 500D.

Further, the pre-heating set temperature before welding is 200-350 ℃, and the whole temperature rises uniformly at 50 ℃/h.

Furthermore, when the transition layer is welded, the welding wire is HS1Cr18Ni9Ti welding wire with the diameter of 2.5mm, the welding current is 100-120A, the arc voltage is 23 +/-1V, and the welding speed is 7 +/-1 cm/min; when the surface overlaying layer is welded, a D256 welding rod with the diameter of 3.2mm is adopted as the welding rod, the welding current is 90-130A, the arc voltage is 22 +/-1V, and the welding speed is 15 +/-1 cm/min.

Compared with the prior art, the surface strengthening surfacing device for the eccentric shaft of the rolling mill has the advantages of simple and reasonable structure, convenient manufacture and low investment cost, is matched with the repair process, can effectively reduce the local temperature difference stress by wholly and uniformly preheating before welding, improves the internal structure, prevents or reduces the hardening structure, and avoids the welding defects such as microcracks and the like generated inside the base material due to uneven high-temperature heating of the welding seam fused by a transition layer, a surface surfacing layer and the base material; the utility model discloses the transition layer adopts the vertical welding of segmentation symmetry, and the surfacing layer adopts from the bottom to the circle build-up welding, can effectively reduce stress and deformation when the whole build-up welding, and the welding wire adopts straight line fortune silk method, and the welding rod adopts oblique circle shape fortune strip method, and surface build-up welding layer upper portion is higher than the body in addition, more is favorable to sufficient surplus processing; the utility model discloses a postweld heat treatment can effectively eliminate welding stress.

Drawings

FIG. 1 is a schematic structural view of a surface strengthening surfacing device for an eccentric shaft of a rolling mill according to the present invention;

FIG. 2 is a schematic view of the explosion structure of the eccentric shaft surface strengthening surfacing device of the rolling mill of the present invention;

fig. 3 is a schematic view of the middle heating tool of the present invention;

fig. 4 is a schematic welding view (vertical plane) of the eccentric shaft of the present invention;

fig. 5 is a schematic welding view (plane) of the eccentric shaft of the present invention;

in FIGS. 1-3: 1. a structural member fixing tool; 11. a base plate; 12. a support; 13. fixing the circular truncated cone; 14. the lower semicircle is fixed with the leaning frame; 15. climbing a ladder; 16. a handrail; 17. a connecting frame; 18. the upper semicircle is fixed with the leaning frame; 19. a rotating shaft; 110. a fixing hole; 2. a eccentric shaft; 21. a worn or shed surface; 22. a vertical handling notch; 3. an upper semicircular movable splint; 4. a movable pin; 5. a heating device; 51. a gas inlet pipe; 52. an annular branch pipe; 53. a communicating pipe; 54. and (4) burning the burner.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal", and the like used in the specification and claims of the present disclosure are used only to indicate relative positional relationships, and when the absolute position of an object to be described is changed, the relative positional relationships are also changed accordingly. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The parts of the present invention not described in detail are the known techniques of those skilled in the art.

Example 1:

as shown in fig. 1-3, the surface strengthening surfacing welding device for the eccentric mandrel of the rolling mill of the present invention comprises a structural member fixing tool 1, an upper semicircular movable clamping plate 3 and a heating tool 5; the utility model discloses a rolling mill, including bottom plate 11, 11 upper surface centers of bottom plate department is provided with fixed round platform 13, fixed round platform 13 centers department sets up and is used for the fixed orifices of 2 bottoms of inclined to one side dabber with 2 bottom looks adaptations of inclined to one side dabber, 11 upper surface of bottom plate is fixed all around four supports 12 of slant inboard top, it is provided with link 17 to fix respectively between 12 tops of two supports of front side and rear side, two link 17 are fixed with semicircle fixed leaning on frame 18 with fixed being provided with between the same side, can dismantle between the two opposite sides and be provided with semicircle movable clamp plate 3, the semicircle groove has been seted up to last semicircle fixed leaning on frame 18 and last semicircle movable clamp plate 3 inboard correspondence, wherein be provided with down semicircle fixed leaning on frame 14 between the middle part of two supports 12 of one side, semicircle fixed leaning on frame 14 inboard has been seted up the semicircle groove down. In this embodiment, the semicircular grooves correspondingly formed in the inner sides of the upper semicircular fixed leaning frame 18 and the upper semicircular movable clamping plate 3, and the semicircular grooves correspondingly formed in the inner sides of the lower semicircular fixed leaning frame 14 are respectively matched with the outer side circumferences of the corresponding parts of the eccentric shaft 2, when the eccentric shaft 2 is hoisted to the inner side of the structural member fixing tool 1 through the vertical hoisting notch 22, the bottom end of the eccentric shaft is inserted into the fixed circular truncated cone 13, the lower part of the eccentric shaft is close to the semicircular groove of the lower semicircular fixed leaning frame 14, the upper part of the eccentric shaft is arranged in the semicircular groove correspondingly formed in the inner sides of the upper semicircular fixed leaning frame 18 and the upper semicircular movable clamping plate 3 for fixing, and the wear or the shedding surface 21 on the upper part of the eccentric shaft 2 is subjected to heat welding, heat treatment and the like through the heating tool 5.

In this embodiment, the heating tool 5 includes a plurality of annular branch pipes 52 that are arranged at an even interval from top to bottom and are communicated through a plurality of communicating pipes 53, wherein one of the annular branch pipes 52 is connected with a gas inlet pipe 51, and a plurality of burners 54 are evenly installed on the inner circumference of each annular branch pipe 52. The heating tool 5 is manufactured according to the outer diameter size of the abrasion or falling surface 21 of the eccentric shaft 2, when the heating tool 5 is used for performing pre-welding preheating and post-welding heat treatment on the position of the abrasion or falling surface 21 of the eccentric shaft 2, the heating tool 5 can be sleeved on the abrasion or falling surface 21, then coal gas is connected and ignited at a burner, and heating can be performed.

In this embodiment, a ladder stand 15 is fixedly arranged between the same side end of each of the two connecting frames 17 and the bottom plate 11, so that an operator can conveniently go up and down; in addition, handrails 16 may be provided outside the ladder 15 to ensure the safety of the worker.

In this embodiment, a supporting plate 111 may be further disposed between the bottom of the lower semicircular fixing leaning frame 14 and the upper surface of the bottom plate 11, so as to improve the stability of the whole device.

In this embodiment, in order to fix the upper portion of the eccentric shaft 2 through the semicircular groove corresponding to the upper semicircular fixing leaning frame 18 and the upper semicircular movable clamp plate 3, one connecting frame 17 connected to the upper semicircular movable clamp plate 3 is provided with a rotating shaft 19, the other connecting frame 17 is provided with a fixing hole 110, the upper semicircular movable clamp plate 3 is provided with through holes respectively corresponding to the rotating shaft 19 and the fixing hole 110, the through hole at one end of the upper semicircular movable clamp plate is sleeved on the rotating shaft 19 and can rotate by taking the rotating shaft 19 as a circle center, and the other side of the upper semicircular movable clamp plate passes through the through hole at the side through the movable pin 4 to be connected and fixed with the fixing hole 110.

In this embodiment, fixed frock of structure 1 can adopt 80mm steel sheet and 50mm square steel machining and welding to form, fixed round platform 13 is made and is welded on fixed frock of structure 1 through phi 400mm round steel ingot, each leans on the frame to form through machining through the 40mm steel sheet, the cat ladder adopts 40mm square tube cutting welding to form, first semicircle movable clamp plate adopts 30mm steel sheet machining to form, heating frock 5 adopts phi 20mm pipe preparation to form, the used material of whole device is common material, easily draw materials, the preparation is convenient, the investment cost is low.

Example 2:

as shown in fig. 1 to 5, the utility model relates to a based on embodiment 1 the repair technology of the rolling mill eccentric mandrel surface strengthening surfacing welding device, 2 tops of eccentric mandrel are provided with perpendicular handling notch 22, upper portion is wearing and tearing or shedding face 21, at first make the whole frame of the fixed frock 1 of structure according to the specification processing of eccentric mandrel 2, then welded fastening round platform 13 on bottom plate 11, semicircle fixed backup frame 14 under the position welded fastening when placing perpendicularly through fixed round platform 13 position and eccentric mandrel 2, again according to the position when placing perpendicularly of eccentric mandrel 2 on two link frames 17 welding installation semicircle fixed backup frame 18, pivot 19 and set up fixed orifices 110, and install semicircle movable clamp plate 3 in the pivot 19 outside, then welding installation cat ladder 15 and handrail 16 again, adopt wire rope will have cleared up the eccentric mandrel 2 of wearing and tearing or shedding face 21 through the perpendicular slotted hole 22 of eccentric mandrel 2 at last time to the fixed frock 1 inside, the tip inserts in the fixed round platform 13 under the eccentric mandrel 2, the intermediate position is fixed through semicircle fixed backup frame 14 down, close to the fixed backup frame 18 on the upper portion of fixed mandrel 2 will close to the fixed backup frame of the upper portion, it can carry out the fixed frock 2 of heating and the fixed frock 2 of semicircular pin is installed again, it is through the fixed frock 2 of heating, it is installed on the semicircular mandrel 2 again, then the fixed frock 2 of the fixed frock 2, it can be through the heating, it is as follows the fixed frock 2, the heating is more than the fixed frock 2, the fixed frock 2 of semicircular pin 21, the fixed frock 2, it is installed on the last semicircular pin, the semicircular pin is installed, the semicircular pin is as follows:

s1, preparation before welding:

1.1 And welding equipment: HT400D or HT500D digital control inverse manual welding rod arc welding and argon arc welding are combined by using a direct current welding machine; the surface layer of the wear-resistant alloy is welded by a D256-4 welding rod; the welding of the transition layer adopts HS1Cr18Ni9Ti welding wires, and the purity of argon is more than or equal to 99.999 percent;

1.2 A heating device: heating the tool 5;

1.3 Auxiliary facilities): angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;

1.4 And) welding part materials: the wear-resistant alloy comprises a body 40CrNiMoA, transition layer stainless steel HS1Cr18Ni9Ti and an outer wear-resistant alloy surface layer;

1.5 And surfacing before welding requires: removing various defects on the surface of the eccentric shaft needing surfacing by machining, and confirming that cracks are removed completely by adopting dye penetrant inspection;

1.6 Host), welding position: vertical surfacing;

1.7 And welding requirements: all welding layers must be free of any welding defects and fused to the base material;

1.8 And welding process parameters: formulating welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;

welding process parameters

S2, welding implementation:

the welding process route is as follows: machining and cleaning a worn or fallen surface of a eccentric shaft 2, installing a structural part fixing tool 1 and placing and fixing the eccentric shaft 2, preheating the worn or fallen surface 21 position from outside to inside by adopting gas through a heating tool 5, carrying out sectional symmetrical welding on a transition layer, confirming a welding seam defect, carrying out surface welding, carrying out surfacing from bottom to top, confirming the welding seam defect, carrying out surfacing acceptance inspection, carrying out postweld heat treatment, covering slow cooling with heat preservation cotton, machining, detecting and accepting, and carrying out delivery and use. The method specifically comprises the following steps:

2.1 Uniformly preheating the worn or falling surface 21 from outside to inside to a set temperature of 200-350 ℃ by a heating tool 5 in a gas heating mode, detecting the temperature of a heating position by a thermodetector, trying to uniformly and integrally preheat the worn or falling surface by raising the temperature by 50 ℃/h, and totally covering the whole preheating part, so that the local temperature difference stress can be reduced, the internal structure is improved, hardening structures are prevented or reduced, the welding defects of microcracks and the like generated in the substrate due to the non-uniform high-temperature heating of a transition layer, a surface overlaying layer and a welding seam fused with the substrate are avoided, and the transition layer and the surface overlaying layer are sequentially welded after the preheating temperature is reached;

2.2 In normal welding, the interlayer temperature of the welding seam is strictly controlled not to be lower than the preheating temperature no matter in the transition layer or the surface overlaying layer; as shown in fig. 4 and 5, the welding method includes that a shaft body at a welding repair position is a, a transition weld overlay is B, a surface weld overlay is C, a transition layer is welded symmetrically in a segmented manner, and the transition layer is divided into a plurality of symmetrical regions to be welded along the circumference, as shown in fig. 5, symmetrical data are represented: 1-2, 3-4, 5-6 and 7-8, wherein each symmetrical area to be welded is synchronously welded vertically, 1-2 in the figure 5 is synchronously welded, and then 3-4, 5-6 and 7-8 are sequentially and synchronously welded; the surface overlaying layer adopts overlaying from bottom to top (as the adjacent end to end in the figure 5); therefore, stress and deformation during integral surfacing are reduced, a linear wire conveying method is adopted for welding wires, an inclined circular strip conveying method is adopted for welding rods, and the upper part of a surfacing layer on the surface is higher than the body, so that sufficient allowance processing is facilitated;

2.3 After the surface of the eccentric shaft 2 is wholly abraded or the shedding surface 21 is completely overlaid, the welding area is subjected to heat treatment at 400-550 ℃ for 6 hours from outside to inside by using a heating tool 5 to eliminate welding stress, and after the temperature is slowly cooled to 250 ℃, the eccentric shaft is wholly covered by heat-insulating cotton and then cooled to room temperature;

2.4 The eccentric shaft 2 is lifted and separated from the structural part fixing tool 1, no defect is confirmed through detection and flaw detection, a welding seam of eccentric shaft wear surface overlaying welding is machined, a sample plate manufactured firstly is adopted for comparison, and the use tolerance size is recovered.

Claims (6)

1. The utility model provides a rolling mill off-center axle surface intensification build-up welding device which characterized in that: the device comprises a structural part fixing tool (1), an upper semicircular movable clamping plate (3) and a heating tool (5); the fixed frock of structure (1) includes bottom plate (11), bottom plate (11) upper surface center department is provided with fixed round platform (13), the inboard top of slant is fixed all around its upper surface and is provided with four supports (12), two supports (12) top of every one side are fixed and are provided with link (17), fixed semicircle fixed leaning on frame (18) of being provided with between two link (17) one sides, can dismantle between the opposite side and be provided with semicircle movable clamp plate (3), the semicircle groove has been seted up to last semicircle fixed leaning on frame (18) and last semicircle movable clamp plate (3) inboard correspondence, wherein be provided with down semicircle fixed leaning on frame (14) between the middle part of two supports (12) of one side, the semicircle groove has been seted up to semicircle fixed leaning on frame (14) inboard down.

2. The surface strengthening surfacing device for the eccentric shaft of the rolling mill according to claim 1, characterized in that: a ladder (15) is fixedly arranged between the same side end part of the two connecting frames (17) and the bottom plate (11).

3. The rolling mill eccentric shaft surface strengthening surfacing device according to claim 2, characterized in that: a handrail (16) is arranged on the outer side of the ladder (15).

4. The surface strengthening surfacing device for the eccentric shaft of the rolling mill according to claim 1, characterized in that: and a supporting plate (111) is arranged between the bottom of the lower semicircular fixing leaning frame (14) and the upper surface of the bottom plate (11).

5. The surface strengthening surfacing device for the eccentric shaft of the rolling mill according to claim 1, characterized in that: a rotating shaft (19) is arranged on one connecting frame (17) connected with the upper semicircular movable clamping plate (3), a fixed hole (110) is formed in the other connecting frame (17), through holes matched with each other are formed in the positions, corresponding to the rotating shaft (19) and the fixed hole (110), of the upper semicircular movable clamping plate (3) respectively, the through hole of one end of the upper semicircular movable clamping plate is sleeved on the rotating shaft (19) and can rotate around the rotating shaft (19), and the other end of the upper semicircular movable clamping plate penetrates through the side through hole through a movable pin (4) to be connected and fixed with the fixed hole (110).

6. The rolling mill eccentric shaft surface strengthening surfacing device according to claim 1, characterized in that: heating frock (5) include from top to bottom even interval set up and through a plurality of annular branch pipes (52) of a plurality of communicating pipes (53) intercommunication, be connected with gas on one of them annular branch pipe (52) and insert pipe (51), a plurality of nozzles (54) are evenly installed to each annular branch pipe (52) inboard circumference.

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