JP3411181B2 - Method and apparatus for joining materials to be rolled in continuous hot rolling equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method and joining apparatus for butt-joining rolling materials to each other in running in a continuous hot rolling facility for steel materials.

[0002]

2. Description of the Related Art In hot rolling equipment for steel materials and the like, a heated slab is made into a sheet bar of an intermediate plate thickness by a rough rolling machine, then rolled to a product plate thickness by a finishing rolling machine row, and run on a runout table. It consists of a continuous process of winding. However, from rough rolling to winding, it is performed for each slab, and troubles due to the threadability of the individual material front end, defective shape at the front and rear ends, and reduction in yield due to poor plate thickness accuracy, etc. There were various problems.

In recent years, continuous hot rolling in which a finishing rolling mill train is continuously threaded and divided in front of a coiler by butt-joining sheet bars after rough rolling (hereinafter referred to as rolled materials) The adoption of the law is expected to solve the above-mentioned conventional problems. To join rolled materials, cut and remove the crops at the trailing edge of the preceding rolled material and the leading edge of the trailing rolled material to adjust the shape of both end surfaces and then run at the same speed as the rolled material. The both ends are clamped by a clamp device mounted on the running joining device, but are joined together and welded.

At this time, the material to be rolled is carried while being supported by a large number of rollers forming a carrying table, so as a means for running the running joining device, Japanese Patent Publication No. 62-532.
Japanese Patent Laid-Open No. 42-42 discloses a method in which each roller is retracted from a position where the rolled material is conveyed to a position where it does not interfere with the device when passing the traveling joining device, and is returned to the position where the rolled material is conveyed after passing the device. There is.

By the way, the leading rolled material and the trailing rolled material from which the crops have been cut and removed often meander before being clamped by the clamp device of the traveling joining device. Further, there may be a case where the end faces of the preceding rolling material and the following rolling material after the cropping are not parallel to each other. Therefore, it is necessary to rotate the clamping device after clamping to correct the position of the cut end surface and to bring the end surfaces of both rolled materials into parallel with each other for butting.

According to the method disclosed in the above publication,
Since the rollers that interfere with each other when passing through the traveling joining device are sequentially retracted from the pass line of the material to be rolled, and after passing, the traveling joining device is made to travel while being gradually returned to the pass line, so that it is on the entrance side of the joining device. The trailing rolled material is always maintained on the pass line. For this reason, when the position of the cutting end face is corrected as described above, there is no portion that absorbs the correction movement amount around the tip of the trailing rolled material, so a large driving force is required to rotate the clamping device. It is necessary and it is difficult to correct the end face position. In addition, there is also a problem that there is no cushioning function corresponding to the fluctuation of the rolling speed of the preceding rolled material.

[0007] Therefore, the inventors of the present invention sequentially descend and retract each roller when passing the traveling joining device, maintain the retracted position after passing, and form a drooping loop on the trailing rolled material while traveling while trailing. Japanese Patent Application No. 7-1424 discloses a method of butt-joining a preceding rolled material by clamping the tip of the rolled material.
Proposed by No. 53. According to this method, due to the existence of the sagging loop, the clamp device can be freely rotated when the cutting surface position of the trailing rolled material is corrected, and the rolling speed fluctuation of the preceding rolled material can be sufficiently coped with. Become.

[0008]

In the method of the above application proposed by the present inventors, a problem occurs when the trailing rolled material tip portion is clamped by the traveling joining device. The situation is shown in FIG. First, as shown in FIG. 5 (a), with the traveling joining device 5 standing by at the standby position, the preceding rolled material 1 is passed through,
Based on the detection of the rear edge by the edge detector 10, the traveling joining apparatus starts traveling, and the movable transport rollers 3 of the interfering transport table are sequentially lowered.

Then, as shown in FIG. 5 (b), the leading end of the succeeding rolled material 2 is introduced into the running joining device 5. At this time, a loop is generated in the trailing rolled material 2 on the entrance side of the support roller 12 of the traveling joining device 5. Then, as shown in FIG. 5C, when the loop becomes large as the traveling joining device 5 travels, the leading end of the trailing rolled material 2 does not enter the entry side clamping device 6 or even if it can be clamped, a predetermined target position is reached. Therefore, there is a risk of defective joint in butt joint. Further, in a severe case, there is a possibility that the running joint device 5 may fall out.

The size and shape of these loops vary depending on the plate thickness, temperature, etc. of the succeeding rolled material 2. In the method of the above application, the pressing roller is provided above the supporting roller 12 of the traveling joining device 5, but the tip of the succeeding rolled material 2 may run over the pressing roller. As a measure against these problems, the running joining device 5 may be lengthened to widen the range of the support roller 12 on the entry side with respect to the entry side clamp device 6. However, the traveling joining device 5
In order to lengthen the length, it is necessary to expand the installation range of the movable conveying roller 3, which is expensive in terms of equipment, and cannot be applied to existing hot rolling equipment.

The present invention relates to a joining method and apparatus for butt-joining rolling materials to each other in running in a continuous hot rolling facility for steel materials, etc. Does not require a large force when abutting parallel to the trailing edge of the preceding rolled material, and it is also capable of responding to fluctuations in the rolling speed of the preceding rolled material. An object of the present invention is to reliably clamp the front end of the rolled material at a predetermined target position to eliminate the risk of troubles on the threaded plate and the risk of defective butt joints.

[0012]

The method of the present invention for achieving the above-mentioned object is to carry out the running joining while running a running joining device provided on an inlet side conveying table of a finishing rolling mill in a continuous hot rolling facility. In the method of clamping the rear end part of the preceding rolled material and the leading end part of the following rolled material in the device and butt-joining both rolled materials, when the traveling joining device passes, it interferes with the traveling joining device. When each transport roller is sequentially lowered to the retracted position and is maintained at the retracted position even after passing through the traveling joining device to form a loop on the trailing material to be rolled into the traveling joining device, the traveling joining device is used. At least until the leading end of the trailing rolled material is clamped, the trailing rolled material near the entry side of the traveling joining device is placed outside the entry side of the traveling joining device.
It is a method of joining rolled materials in a continuous hot rolling facility, characterized in that it is supported on a pass line by an auxiliary roller provided in the section .

Then, it is preferable to retract the auxiliary roller after the leading end portion of the trailing rolled material is clamped by the traveling joining device, and further, the auxiliary roller is provided in the traveling joining device and is taken in and out from the entrance side of the traveling joining device. It is preferable to support the succeeding rolled material by using the swing roller as an auxiliary roller.

Further, the apparatus of the present invention for achieving the above object is configured such that the traveling joining apparatus provided on the entrance side transport table of the finishing rolling mill in the continuous hot rolling equipment is run while the preceding joining apparatus is used by the traveling joining apparatus. A device for clamping the trailing end of a rolled material and the leading end of a trailing rolled material and butt-joining both rolled materials to each other, wherein the transport table interferes with the running joining device when passing through the running joining device. A roller elevating mechanism is provided that sequentially lowers each transport roller to the retracted position and maintains the retracted position even after passing through the traveling joining device. The traveling joining device includes a trailing end portion of the preceding rolled material and a trailing rolled material. Clamping device for clamping the tip of each of the above, a joining torch for butt-joining rolled materials, and at least until the tip of the trailing rolled material is clamped by the clamping device Run an auxiliary roller for supporting a row the rolled material after the traveling welding device entry side vicinity on the pass line is
A joining device for a material to be rolled in a continuous hot rolling facility, which is provided outside the entrance side of the row joining device .

Further, it is preferable to have a mechanism for retracting the auxiliary roller after the leading end portion of the trailing rolled material is clamped by the traveling joining device, and further, the auxiliary roller is
It is preferable that the swing roller is provided in the traveling joining device and is taken in and out from the entry side of the traveling joining device.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The method of the present invention will be described with reference to a specific example shown in FIG. Material such as heated slab (not shown)
Are roughly rolled one by one to a medium plate thickness by a rough rolling machine 14 to be a material to be rolled, and are made to travel from left to right on a pass line L indicated by a chain line, while cropping the front end portion and the rear end portion. Is cut and removed by the cutting machine 15. Then, while the traveling joining device 5 is traveling at the same speed as the material to be rolled, the preceding material 1 to be rolled is
The cutting surface at the trailing end and the cutting surface at the leading end of the trailing rolled material 2 are butt-joined and continuously rolled to the product sheet thickness by the finishing rolling mill train 16.

After the rough rolling, the leading rolled material (preceding rolled material 1) has its tip portion cut and removed by the cutting machine 15, and then introduced into the traveling joining device 5 and passed through the device 5. Then, it is introduced into the finish rolling mill train 16, and the rear end portion is cut and removed by the cutting machine 15 and then clamped and held by the delivery side clamping device 7 of the traveling joining device 5. At this time, the traveling joining device 5 starts traveling based on the detection of the trailing edge of the preceding rolled material 1 by the end detector 10 and causes the traveling to travel toward the finish rolling mill train 16 at the same speed as the preceding rolled material 1. ing.

For the next rolled material (subsequent rolled material 2), the crop at the tip is cut and removed by the cutting machine 15, the tip is introduced into the traveling joining device 5, and is clamped by the inlet side clamping device 6. Hold. Then, the entry side clamping device 6 is brought closer to the exit side clamping device 7 by the butt cylinder 8 so that the leading end surface of the trailing rolled material 2 is butted against the trailing end surface of the preceding rolled material 1 and welded by the joining torch 9. To do. During this period, the traveling joining device 5 is operated at the same speed as that of the materials 1 and 2 to be rolled to finish the rolling mill train 16
After the joining is completed, the clamping pressure of both clamp devices 6 and 7 is released, and the clamp devices 6 and 7 are returned to the retracted position on the rough rolling mill 14 side.

Thereafter, the succeeding rolled material 2 becomes the next preceding rolled material 1, and the crop at the rear end is cut by the cutting machine 15.
Then, the traveling joining device 5 is made to travel at the same speed as the preceding rolled material 1 and clamped and held by the delivery side clamping device 7. Then, regarding the leading end of the following rolled material 2,
Similarly to the above, the crop is cut and removed, and the front end face is butt-joined to the rear end face of the preceding rolled material 1. In this way, the rolled materials sent one after another are butt-joined. The material continuously rolled by the finishing rolling mill train 16 passes through a runout table (not shown) and is wound by a coiler (not shown). At this time, a cutting machine before the coiler divides each material unit such as a slab into product coils.

According to the method of the present invention, in such a joining method of the materials to be rolled in the continuous hot rolling equipment, the traveling joining device 5 provided on the entry side conveying table of the finishing rolling mill train 16 is used.
Transport roller 3 that interferes with traveling joining device 5 when passing through
Are sequentially lowered to the retreat position and maintained at the retreat position after passing the traveling joining device 5 to form a loop on the trailing rolled material 2 on the entrance side of the traveling joining device 5 at least after the traveling joining device 5. Until the front end of the rolled material 2 is clamped, the trailing rolled material 2 near the entry side of the traveling joining device 5 is supported by the auxiliary line 11 on the pass line L.

In the example of FIG. 1, the entrance side conveying table of the finishing rolling mill train 16 is composed of the movable conveying rollers 3 and the fixed conveying rollers 4, and the movable conveying rollers 3 are passed through the traveling joining device 5 as shown in the figure. It is designed to descend sequentially to the retracted position. The auxiliary roller 11 is a swing roller provided in the traveling joining device 5. FIG. 1 shows that the trailing rolled material 2 on the entrance side of the traveling joining device 5 has an auxiliary roller 11
Shows the state of being supported by the pass line L.

The movements of the rolled materials 1 and 2 and the traveling joining device 5 according to the method of the present invention will be described with reference to FIG. The traveling joining device 5 initially includes the movable transport roller 3 as shown in FIG.
2 (a), the vehicle is waiting at the entrance end of the sheet, and the edge detector 10 starts traveling based on the detection of the trailing edge of the preceding rolled material 1.
As described above, the tip of the succeeding rolled material 2 is introduced onto the support roller 12. Then, as shown in FIG. 2B, the auxiliary roller 11 is swung to move the succeeding rolled material 2 to the pass line L.
To support. The timing of swinging the auxiliary roller 11 is preferably early as long as it does not hit the end of the fixed transport roller 4.

Then, when the leading end of the succeeding rolled material 2 reaches the proper position in the inlet side clamp device 6, the inlet side clamp device 6 and the outlet side clamp device 7 are operated as shown in FIG. 2 (c). The preceding rolled material 1 and the following rolled material 2 are clamped, the entry side clamping device 6 is moved as shown in FIG.

After the materials 1 and 2 to be rolled are butt-joined in this way, the clamps of the inlet side clamping device 6 and the outlet side clamping device 7 are opened, and the traveling joining device 5 is moved to the inlet side end of the movable conveying roller 3. Back to the standby position. At this time,
Since the movable transport roller 3 is lowered to the retracted position,
The traveling joining device 5 can be passed as it is, and after passing through the device 5, the movable transport rollers 3 on the side of the finishing rolling mill train 16 are sequentially raised to the pass line L.

According to the method of the present invention, the trailing rolled material 2 is supported on the pass line L by the auxiliary roller 11 at least until the trailing rolled material 2 is clamped by the inlet side clamping device 6. The leading end of the trailing rolled material 2 is reliably clamped by the entry side clamping device 6, and there is no problem that the leading end falls off from the traveling joining device 5.
Further, since the workpiece is clamped at a predetermined target position, the problems of defective butting of the materials to be rolled and defective welding and joining due to improper clamping position can be solved.

After clamping, the auxiliary roller 1
1 is not retracted, a loop is formed in the trailing rolled material 2 on the entry side of the auxiliary roller 11, so that the trailing rolled material 2 at the trailing end of the preceding rolled material 1 as shown in FIG. It is easy to move the trailing rolled material 2 of the loop portion in the width direction as shown by the arrow when the tips of the two are abutted, and the entry side clamping device 6 can be freely rotated without requiring a large force. By doing so, both end faces can be made parallel and abutted. Further, this loop can sufficiently cope with the speed fluctuation of the preceding rolled material 1.

In the method of the present invention, the trailing rolled material 2 may be supported on the pass line L by the auxiliary roller 11 at least until the leading end of the trailing rolled material 2 is clamped by the inlet side clamping device 6. After clamping, it is preferable to retract the auxiliary roller 11 from the position indicated by the solid line in FIG. 1 to the position indicated by the broken line. This is because the retreat in this way prevents the temperature of the succeeding rolled material 2 in contact with the auxiliary roller 11 from decreasing. Therefore, if there is no fear that the temperature of the succeeding rolled material 2 will be lowered by providing the auxiliary roller 11 with a heating means or the like, it is not necessary to evacuate.

In the method of the present invention, the auxiliary roller 1
It is preferable to use the swing roller as described above as 1. However, in addition to this, the swing roller is moved in and out from the traveling joining device 5 side toward the fixed conveying roller 4 side or from the fixed conveying roller 4 side toward the traveling joining device 5 side. Possible extrusion rollers and the like can also be adopted.

Next, the apparatus of the present invention is a joining apparatus for joining rolled materials in a continuous hot rolling facility as shown in FIG. A roller elevating mechanism that sequentially lowers the transport roller 3 that interferes with the traveling joining device 5 to the retracted position during passing and maintains the retracted position after passing the traveling joining device 5 is provided. An inlet side clamping device 6 and an outlet side clamping device 7 for clamping the rear end of the material 1 and the leading end of the following rolled material 2 respectively, and a joining torch 9 for joining abutting portions of the materials to be rolled are provided, And, at least until the tip of the trailing rolled material 2 is clamped, the auxiliary roller 1 for supporting the trailing rolled material 2 near the entrance side of the traveling joining device 5 on the pass line L.
1 is provided.

In the apparatus of the present invention, the movable transport roller 3
Although not shown in the drawings, the elevating mechanism is not shown, but based on the detection result of the edge detector 10 or the position detection result of the traveling joining device 5 when joining the rolled materials to each other,
When descending in sequence and returning to the standby position after joining,
After passing through the traveling joining device 5, the mechanism may be such that it is sequentially raised to the pass line L.

The inlet side clamping device 6 and the outlet side clamping device 7 respectively control the rear end portion of the preceding rolled material 1 and the leading end portion of the following rolled material 2 at appropriate preset positions by a control mechanism (not shown). It may be a mechanism such as a cylinder for clamping. Further, at least the entrance side clamping device 6 is rotatable within the plate surface of the following rolled material 2 as shown in FIG. The welding torch 9 may be laser welding, arc welding, or the like.

In the apparatus of the present invention, at least until the leading end of the trailing rolled material 2 is clamped by the entry side clamping device 6, the trailing rolled material 2 is supported by the pass line L by the auxiliary roller 11. After clamping, the auxiliary roller 11
It is preferable to have a mechanism for retracting from the position indicated by the solid line in FIG. 1 to the position indicated by the broken line. As the retracting mechanism, a control mechanism or the like that moves the auxiliary roller 11 based on the operation of the entrance side clamping device 6 can be adopted. The reason for evacuating is as described in the above method of the present invention.

The auxiliary roller 11 is preferably a swing roller as shown in FIG. 4, for example. Figure 4
, The auxiliary roller 11 moves between the retracted position indicated by the solid line and the operating position indicated by the broken line between the swing roller rotating shaft 17
The mechanism is such that the cylinder 19 swings around the axis. The operating position is the trailing rolled material 2 and the pass line 12
Position to support.

The swing roller rotating shaft 17 and the cylinder 19 have a fixed portion rotatably supported by a pedestal 18 of the traveling joining device 5 by a pedestal side fixed shaft, and an operating portion on the arm of the swing roller and a swing roller side. It is rotatably supported by a fixed shaft 21. Then, when the operating part of the cylinder 19 is extended to the maximum, the auxiliary roller 11 is set to the operating position shown by the broken line, and when the operating part is contracted, it comes into contact with the stopper 22 and comes to the retracted position shown by the solid line. Set to.

Further, as the auxiliary roller 11, in addition to the swing roller as described above, from the running joining device 5 side to the fixed conveying roller 4 side or the fixed conveying roller 4 is used.
It is also possible to employ an extrusion type roller or the like that can be put in and taken out from the side toward the traveling joining device 5 side. When using the push-out type roller from the side of the traveling joining device 5, FIG.
A cylinder can be installed in the lower part of the gantry 18 and the auxiliary roller 11 can be moved in and out along the pass line 12 by the cylinder.

[0036]

【Example】

(Example of the present invention): In a continuous hot rolling facility as shown in Fig. 1, sheet bars (rolled materials) after rough rolling were butt-joined by the method of the present invention and the apparatus of the present invention. The target material is low carbon steel, and the strip width of the rolled material after rough rolling is 120
The thickness is 0 mm, the plate thickness is 35 mm, and the length is about 80 m. The front and rear crops of the material to be rolled were cut and removed by a cutting machine 15, and the running material to be welded 5 butt-joined the preceding rolled material 1 and the following rolled material 2.

When the trailing rolled material 2 is supported on the pass line L by the auxiliary roller 11, the length of the trailing rolled material 2 between the center of the entry side clamp device 6 and the auxiliary roller 11 is 4 m.
Then, the materials to be rolled were butted to each other by the procedure shown in FIG. 2, and the butted portions were joined by laser welding. As a result, no trouble occurred on the threaded plate, the joining result was good, and no trouble occurred due to poor joining.

(Comparative Example): In the continuous hot rolling equipment as shown in FIG. 1, with the auxiliary roller 11 of the traveling joining device 5 being fixed at the retracted position shown by the broken line, the same as in the above-mentioned example of the present invention. The materials to be rolled were butt-joined to each other.
That is, also in FIG. 2B, the auxiliary roller 11 is in the same state as in FIG.

As a result, the trailing rolled material 2 was bent on the support roller 12 on the entrance side of the traveling joining device 5. Therefore, in FIG. 2 (c), the clamping position of the leading end portion of the trailing rolled material 2 by the entrance side clamping device 6 deviates from the predetermined target position, and when the butting is performed as shown in FIG. A defect occurred in the welded joint.

[0040]

INDUSTRIAL APPLICABILITY The present invention relates to a joining method and apparatus for butt-joining rolling materials to each other in a continuous hot rolling facility for steel materials and the like, and at least a tip portion of a trailing rolling material. Until the clamping, the auxiliary roller provided on the entrance side of the traveling joining device supports the trailing rolled material on the pass line, so that the trailing rolled material is reliably introduced into the traveling joining device, and Since it is reliably clamped and is clamped at a position in a predetermined target range, the risk of joint failure in butt jointing of rolled materials can be eliminated. At the time of butt, both end surfaces can be easily made parallel by a loop on the running joining device entrance side, and it is possible to sufficiently cope with fluctuations in the rolling speed of the preceding rolled material.

Therefore, in the butt-joining of the rolled materials, the risk of troubles on the threaded plate is eliminated, and the weld-joining failure due to the butt-failure does not occur, and the joining portion in the finishing rolling mill train is broken. Is eliminated, stability of operation is improved, and productivity and product yield are improved.

[Brief description of drawings]

FIG. 1 is a front view of an example method and apparatus of the present invention.

FIG. 2 is an explanatory view showing an example of the method of the present invention, (a),
(B), (c), and (d) show the states of the material to be rolled and the traveling joining device in the method of the present invention, respectively.

FIG. 3 is a perspective view showing an operation of the method and apparatus of the present invention.

FIG. 4 is a front view showing an example of the device of the present invention.

FIG. 5 is an explanatory diagram showing an example of a conventional method, (a),
(B) and (c) respectively show the states of the material to be rolled and the running joining device in the conventional method.

[Explanation of symbols]

1 ... Leading rolled material 2 ... Trailing rolled material 3 ... Movable transport roller 4 ... Fixed transport roller 5 ... Travel joining device 6 ... Inlet side clamp device 7 ... Outlet side clamp device 8 ... Butt cylinder 9 ... Joining torch 10 ... Edge detector 11 ... Auxiliary roller 12 ... Support roller 13 ... Retracted position 14 ... Rough rolling mill 15 ... Cutting machine 16 ... Finishing rolling mill row 17 ... Swing roller rotating shaft 18 ... Frame 19 ... Cylinder 20 ... Frame side fixed shaft 21 ... Swing roller side fixed shaft 22 ... Stopper L ... Pass line

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-309403 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 1/00-1/46 B21B 15 / 00 B21B 39/00 B21B 39/12

Claims (6)

(57) [Claims] 1. A running joining device provided on an entrance side conveyance table of a finishing rolling mill in a continuous hot rolling facility is run, and at the running joining device, a trailing end portion of a preceding rolled material and a trailing rolled material are rolled. In a method of clamping the front end of a material and butt-joining both rolled materials, when passing through a traveling joining device, each transport roller that interferes with the traveling joining device is sequentially lowered to a retracted position, When forming a loop in the trailing rolled material on the entrance side of the traveling joining device while maintaining the retracted position even after passing, until at least the tip of the trailing rolled material is clamped by the traveling joining device. , The trailing rolled material near the entry side of the traveling joining device is outside the entry side of the traveling joining device.
A method for joining materials to be rolled in a continuous hot rolling facility, characterized in that the material is supported on a pass line by an auxiliary roller provided in the section . 2. The method for joining rolled materials in a continuous hot rolling facility according to claim 1, wherein after the leading end portion of the trailing rolled material is clamped by the traveling joining device, the auxiliary roller is retracted. . 3. The trailing material to be rolled is supported by a swing roller which is provided in the traveling joining device and which is taken in and out from the entry side of the traveling joining device, as an auxiliary roller. A method for joining rolled materials in a continuous hot rolling facility. 4. A traveling joining device provided on an entrance-side conveying table of a finishing rolling mill in a continuous hot rolling facility is made to travel, and at the traveling joining device, a trailing end portion of a preceding rolled material and a trailing rolled material are rolled. In a device for clamping the front end of a material and butt-joining both rolled materials, in the transport table, each transport roller that interferes with the traveling joining device when passing the traveling joining device is sequentially lowered to a retracted position, A roller elevating mechanism for maintaining the retracted position even after passing through the traveling joining device is provided,
The traveling joining device includes a clamping device that clamps the trailing end of the preceding rolled material and the leading end of the following rolled material,
A joining torch for butt-joining rolled materials is provided, and at least until the leading end of the trailing rolled material is clamped by the clamping device, the trailing rolled material near the entrance side of the traveling joining device A joining device for a material to be rolled in a continuous hot rolling facility, characterized in that an auxiliary roller for supporting the sheet on a pass line is provided outside the entrance side of the running joining device. 5. The material to be rolled in the continuous hot rolling facility according to claim 4, further comprising a mechanism for retracting the auxiliary roller after the leading end portion of the trailing material to be rolled is clamped by the traveling joining device. Joining equipment. 6. The continuous hot rolling equipment according to claim 4, wherein the auxiliary roller is a swing roller which is provided in the traveling joining apparatus and is put in and taken out from the entry side of the traveling joining apparatus. Equipment for joining rolled materials.