Rest bar fixing method and fixing device

Abstract

To ensure reliable fixation by simplifying fixation of a rest bar.SOLUTION: Holding parts 1a on both sides of a back surface of a rolling mill 1 are provided with holding grooves 1a1 where horizontal cross sections long in a vertical direction have T-shapes and their rest part 2 sides are open. Bolt through-holes are opened in a flange part 2a of the rest bar arranged opposite both holding parts. Hydraulic cylinders 3 fitted to the flange parts are provided with pistons which are housed rotatably in the bodies 3a and rods which are driven by the pistons and are movable back and forth to the holding parts. Bolts are connected to ends of the rods, T-shaped engaging parts that can engage the holding grooves are fitted to the ends of the bolts, and handles 5 which project from the bodies backward and are removable from / attached to projection ends are provided at the rear end parts of the rods.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and device for fixing a rest bar attached to a rolling mill. [Background technology]

[0002] A conventional rest bar for mounting on a rolling mill is disclosed in Japanese Patent Application Laid-Open No. 2009-255099. The disclosed rest bar is held by a holder on the rolling mill side, and the holder is detachably attached to the rolling mill with bolts. The rest bar is then fixed via the holder by a clamp cylinder that hydraulically presses the rest bar toward the rolling mill. A spring is incorporated in the clamp cylinder, and this spring biases the clamp cylinder rod in a direction that presses the tip of the rod against the rest bar. The spring force allows the rest bar to be fixed to the rolling mill even when the hydraulic pressure of the clamp cylinder is cut off. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-255099 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional example has the advantage that the rest bar can be reliably fixed, but as an improvement method, it has been desired to simplify the fixing method and fixing device of the rest bar. SUMMARY OF THE INVENTION An object of the present invention is to simplify the fixing of the rest bar and to enable a secure fixing. [Means for solving the problem]

[0005] The method of fixing a rest bar according to the present invention is characterized in that hydraulic cylinders are attached to the flanges at both ends of the rest bar in advance, the rest bar is then positioned on at least one side, either the front or rear, of the rolling mill, and the two flanges are aligned so as to face the retaining grooves of the retaining parts provided at a distance from each other on the one side, the hydraulic cylinder is then advanced to insert the bolt connected to the tip of the rod and the T-shaped fitting of the bolt into the retaining groove, the rod of the hydraulic cylinder is then rotated 90 degrees around the axis of the rod, and the T-shaped fitting housed in the retaining groove is rotated 90 degrees to fit into the deepest part of the retaining groove, and the rod is then moved backward by the hydraulic pressure of the hydraulic cylinder so that the T-shaped fitting in the fitted state is tightly attached to the inner surface of the opening side of the retaining groove. A first feature of the rest bar fixing device according to the present invention is that it comprises holding portions provided at intervals on at least one side, either the front or rear side, of the rolling mill, bolt through holes opened in flange portions at both ends of the rest bar arranged on one side of the rolling mill, and a hydraulic cylinder attached to the flange portion of the rest bar. Each of the holding parts is provided with a holding groove that is long in the vertical direction and has a T-shaped horizontal cross section, opening toward the rest bar. Each of the hydraulic cylinders is provided with a piston that can move back and forth within the body toward the rest bar, and a rod that moves with the piston. A bolt is connected to the tip of the rod, and a T-shaped fitting that can fit into the holding groove is attached to the tip of the bolt. The rear side of the rod protrudes from the body, and a rotation operating means can be detachably attached to the protruding end. The bolt, together with the T-shaped fitting, can be inserted into and passed through the bolt through-hole toward each of the holding parts, and the T-shaped fitting can be detachably attached to the holding groove. The rotation force of the rod can be transmitted to the bolt via the piston by rotating the rotation operating means. A second feature of the rest bar fixing device of the present invention is that, based on the first feature, the rod consists of a front rod and a rear rod sandwiching a piston, the front rod is capable of following the piston and has a bolt connected to its tip, and either a handle or a wrench, which serves as a rotation operating means, can be attached and detached to the rear end of the rear rod. [Effects of the Invention]

[0006] According to the present invention, by simply providing a retaining groove in the retaining section on one side of the rolling mill and placing a hydraulic cylinder opposite the flange section of the rest bar, the rest bar can be securely fixed to the rolling mill simply by operating the hydraulic cylinder rod back and forth using hydraulic force and by using clamping force, thereby simplifying the work of installing and fixing the rest bar and enabling safer work. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of a rolling mill showing a state in which a rest bar in a fixing device according to the present invention is being attached. [Figure 2] FIG. 2 is a right side view of FIG. [Figure 3] FIG. 10 is an enlarged front view showing a state in which a hydraulic cylinder is attached to the rest bar of the fixing device according to the present invention. [Figure 4] FIG. 4 is a plan view of FIG. 3, showing a part of the hydraulic cylinder in cross section. [Figure 5] FIG. 4 is a right side view of FIG. 3. [Figure 6] 1A and 1B are enlarged views showing the holding part of the rolling mill, in which (a) is a front view, (b) is a side view with some parts omitted, and (c) is a horizontal cross-sectional view of (a). [Figure 7] FIG. 2 is an enlarged side view showing a hydraulic cylinder in the fixing device according to the present invention. [Figure 8] 8A and 8B are enlarged views showing the bolt of the hydraulic cylinder in the fixing device according to the present invention, where FIG. 8A is a cross-sectional view taken along line VIII-VIII in FIG. 7, and FIG. 8B is a view showing the bolt shown in FIG. 8A rotated 90 degrees. [Figure 9] These are enlarged horizontal cross-sectional views showing the operation of the hydraulic cylinder in stages during the installation process of the rest bar, where (a) shows the state in which the bolt of the hydraulic cylinder is facing the retaining groove of the retaining part, and (b) shows the state in which the bolt of the hydraulic cylinder and the T-shaped fitting part are inserted into the retaining groove of the retaining part. [Figure 10] These are enlarged horizontal cross-sectional views showing the operation of the hydraulic cylinder in stages during the process of fixing the rest bar, where (a) shows the state in which the handle is rotated 90 degrees counterclockwise from the state in which the bolt and T-shaped fitting part of the hydraulic cylinder are inserted into the retaining groove of the retaining part, and (b) shows the state in which the hydraulic pressure of the hydraulic cylinder has caused the bolt to retract through the rod, bringing the T-shaped fitting part into tight contact with the inner opening surface of the retaining groove. DETAILED DESCRIPTION OF THE INVENTION

[0008] A method and device for fixing a rest bar according to the present invention will be described with reference to the drawings. First, the rest bar fixing device will be described. 1 and 2, the fixing devices M are attached to both the front and rear sides of the rolling mill 1 through which the rolled material enters and passes. Since the fixing devices M on both the front and rear sides have the same configuration, only the fixing device attached to the rear side of the rolling mill 1 will be described, and a description of the configuration of the fixing device on the front side will be omitted. In Figures 1 to 5, the fixing device M includes a holding portion 1a provided at a distance from the rear surface of the rolling mill 1, bolt through holes 2a1 opened in flange portions 2a at both ends of a rest bar 2 arranged on the rear side of the rolling mill, and a hydraulic cylinder 3 having a rod 3c that can be advanced and retreated toward the rest bar side.

[0009] As shown in Figures 1, 2 and 6, each holding portion 1a in the rolling mill 1 is provided with a holding groove 1a1 that is long in the vertical direction and has a T-shaped horizontal cross section. In the horizontal cross section of each holding groove 1a1, the side facing the rest bar 2 (left side in Figure 6(A)) is open, and the inner part of the groove is wide.

[0010] As shown in Figures 1 and 2, the rest bar 2 is attached to the back of the rolling mill 1, and bolt through holes 2a1 are drilled in the flange portions 2a on both ends (Figures 2 and 4). In the example shown in Figure 2, the bolt through holes 2a1 on both sides are provided in two rows, one above the other. In addition, a guide mounting portion 7 is provided on the front side of the rest bar 2. A guide is mounted on the guide mounting portion 7 to guide the rolled material entering and passing through the rolling mill 1 to the rolling rolls (not shown).

[0011] In the hydraulic cylinder 3 shown in FIG. 7, a body 3a, a piston 3b, and a rod 3c constitute its main parts. The piston 3b is housed in the body 3a and is capable of moving forward and backward toward the rest bar 2. The rod 3c consists of a front rod 3c1 and a rear rod 3c2, with the piston 3b sandwiched between them. A bolt 4 that protrudes toward the rest bar 2 is coaxially connected to the front rod 3c1, and a T-shaped fitting portion 4a that can fit into the retaining groove 1a1 is attached to the tip of the bolt. The T-shaped fitting portion 4a is formed long and extends along the opening of the vertically long retaining groove 1a1, as shown in Figure 8(A). When the bolt 4 is rotated 90 degrees in the direction of the arrow in Figure 8(A) (counterclockwise), the T-shaped fitting portion 4a also rotates 90 degrees, as shown in Figure 8(B), intersecting the opening of the retaining groove 1a1, indicated by the chain line, and fitting into the inner part of the retaining groove. The rear end of the front rod 3c1 is screwed into the piston 3b. The tip of the rear rod 3c2 (the end of the front rod 3c1) is screwed into the piston 3b. The rear end of the rear rod 3c2 protrudes rearward (left side in Figure 7) from the body 3a, and a detachable handle 5 is provided at the protruding end. The bolt 4 can be inserted into the bolt through-hole 2a1 of the flange portion 2a of the rest bar 2 together with the T-shaped fitting portion 4a toward each holding portion 1a and pass through this hole. In the example shown in Figure 7, the orientation of the body of the handle 5 is set parallel to that of the T-shaped fitting 4a, which is long vertically. Therefore, the rotation direction and angle of the body of the handle 5 are the same as those of the T-shaped fitting 4a. Therefore, the rotation direction and angle of the body of the handle 5 can be recognized, and those of the T-shaped fitting 4a can be recognized, and the handle serves as a guide for the operation of the T-shaped fitting. The rotational force of the rear rod 3c2 can be transmitted to the front rod 3c1 through the rotation of the handle 5. The T-shaped fitting portion 4a can be attached to and detached from each of the holding grooves 1a1. When the rest bar 2 is assembled into the rolling mill 1, the hydraulic cylinder 3 is attached to the flange portion 2a of the rest bar in advance. Regarding installation, the hydraulic cylinder 3 is placed on the back of both flange portions 2a of the rest bar 2, and then the bolts 4 and T-shaped fitting portions 4a are passed through the bolt through holes 2a1 in the flange portions so that they protrude forward of the flange portions. The four corners of the hydraulic cylinder body 3a are then inserted forward from the rear of the body using the mounting bolts 6, which are then screwed into the flange portions of the rest bar to attach and secure the hydraulic cylinder to the rest bar.

[0012] The relationship between the holding portion 1a, the rest bar 2, and the hydraulic cylinder 3 will be described with reference to FIGS. The rest bar 2 is provided horizontally on the rear side of the rolling mill 1, and flange portions 2a at both ends thereof face the respective holding portions 1a. The hydraulic cylinders 3 face each of the holding portions 1a via the rest bars 2 and also face the bolt through holes 2a1 in the flange portions 2a on both ends of the rest bars. As described above, the hydraulic cylinders 3 are attached to both flange portions 2a of the rest bar 2.

[0013] Next, a method for fixing the rest bar will be described. As shown in FIGS. 3 to 5, hydraulic cylinders 3 are fixedly attached to flange portions 2a at both ends of rest bar 2 with mounting bolts 6 in advance. First, the rest bar 2 is lifted up by a crane and placed on the back side of the rolling mill 1. Then, both flange portions 2a of the rest bar are positioned to face the holding grooves 1a1 of the holding portions 1a of the rolling mill 1. Next, as shown in Figure 9(A), the hydraulic cylinder 3 is advanced in the direction of the arrow, and the bolt 4, which is located at the tip side of the rod 3c (Figure 7) and passes through the bolt through-hole 2a1 opened in the flange portion 2a, and the T-shaped fitting portion 4a at its tip are inserted into the holding groove 1a1 {Figure 9(B)}. Next, the handle 5 at the rear end of the rear rod 3c2 of the hydraulic cylinder 3 is rotated 90 degrees counterclockwise. If the handle 5 is not already attached, attach the attached end of the handle to the rear end of the rear rod 3c2 and then rotate the handle 90 degrees counterclockwise. As shown in Figure 10(A), the rotational force generated by the rotation of the handle 5 is transmitted from the rear rod 3c2 to the front rod 3c1 via the piston 3b. The T-shaped fitting 4a housed in the inner portion of the retaining groove 1a1 is then rotated 90 degrees via the bolt 4, and is fitted into the wide inner portion of the retaining groove. Finally, as shown in Figure 10(B), the hydraulic pressure of the hydraulic cylinder 3 retracts the front rod 3c1 and the bolt 4, causing the T-shaped fitting 4a, which is in the fitted state, to come into close contact with the inner surface of the opening side of the retaining groove 1a1. As a result, the rest bar 2 attached to the rear of the rolling mill 1 is fixed.

[0014] In the example of FIG. 2, the fixing devices M are provided on both sides of the rolling mill 1, but they do not necessarily have to be on both sides and may be on one side. In FIG. 1, the hydraulic cylinders 3 are arranged in two rows, one above the other, on both flange portions 2a of the rest bar 2, but the number of hydraulic cylinders arranged does not need to be multiple; one on each flange portion may be sufficient. Furthermore, the hydraulic cylinder 3 is not limited to the configuration shown in the figure, as long as the rotational force of the handle 5 is transmitted through the rod 3c to the T-shaped fitting portion 4a of the bolt 4 at the tip of the rod 3c. For example, the rear rod 3c2 may be rotatably inserted into the piston 3b, and its tip may be inserted and coupled to the front rod 3c1 screwed into the piston, thereby integrating the front and rear rods. The handle 5 may be attached to the rear end of the rod 3c of the hydraulic cylinder 3 in advance, or may be attached at the time of operation and then rotated. In the illustrated example, a handle 5 is used as the rotation operation means, but it is not limited to a handle and may be a wrench or a rod that can be attached to the rear end of the rod 3c in a penetrating state.

[0015] In the present invention, the rest bar 2, which has already been fitted with the hydraulic cylinder 3, is lifted and placed on both the front and rear sides of the rolling mill 1, the bolt 4 of the hydraulic cylinder's rod 3c is aligned with the holding groove 1a1 of the holding part 1a, the hydraulic cylinder is then advanced to insert the bolt and T-shaped fitting 4a into the holding groove of the holding part, and then the handle 5 is turned 90 degrees to rotate the T-shaped fitting 90 degrees together with the bolt of the hydraulic cylinder so that the T-shaped fitting is fitted into the holding groove, and then the rod is retracted by hydraulic force to bring the T-shaped fitting into tight contact with the inner surface of the opening of the holding groove, thereby enabling the rest bar to be securely fixed, the fixing operation to be performed without requiring many people, the work of fixing the rest bar can be simplified, and safer work can be performed. [Explanation of symbols]

[0016] 1. Rolling mill 1a Holding part 1a1 Retaining groove 2. Rest Bar 2a Flange 2a1 Bolt through hole 3 hydraulic cylinders 3a Body 3b Piston 3c Rod 3c1 Front rod 3c2 Rear rod 4 bolts 4a T-type fitting part 5. Handle (rotation operation means) 6 Mounting bolts

Claims

1. a hydraulic cylinder attached to flanges at both ends of the rest bar, the rest bar then being positioned on at least one of the front or rear sides of the rolling mill with the flanges facing the retaining grooves of retaining parts provided at a distance from each other on the one side; the hydraulic cylinder then being advanced to insert the bolt connected to the rod tip and the T-shaped fitting of the bolt into the retaining groove; the rod of the hydraulic cylinder then being rotated 90 degrees around the axis of the rod, causing the T-shaped fitting housed in the retaining groove to be rotated 90 degrees and fitted into the inner part of the retaining groove; and the rod then being retracted by the hydraulic pressure of the hydraulic cylinder, causing the T-shaped fitting in the fitted state to be tightly attached to the inner surface of the opening side of the retaining groove.

2. The rolling mill includes holding sections provided at least on one side of the front or rear of the rolling mill with a gap therebetween, bolt through holes formed in flanges at both ends of a rest bar disposed on one side of the rolling mill, and a hydraulic cylinder attached to the flanges of the rest bar, Each of the holding portions is provided with a holding groove that is long in the vertical direction and has a T-shaped cross section in the horizontal direction, and that is open vertically on the side of the rest bar, Each of the hydraulic cylinders has a piston that can move back and forth within the body toward the rest bar, and a rod that follows the piston. The rod has a bolt connected to its tip, and a T-shaped fitting portion that can fit into the holding groove is attached to the tip of the bolt, and protrudes from the body on the rear side, with a rotation operation means that can be attached and detached to the protruding end. The bolt can be inserted into and penetrate the bolt through-hole together with the T-shaped fitting portion toward each of the holding portions, The T-shaped fitting portion is formed long along the opening of the holding groove that is long in the vertical direction, After being inserted into the holding structure, the retaining member rotates to intersect with the opening of the holding groove, and then retreats while remaining in the intersecting state, thereby being removably fitted into the holding groove; The rotation force of the rod can be transmitted to the bolt via the piston through the rotation operation of the rotation operation means. A rest bar fixing device characterized by the above.

3. A rest bar fixing device as described in claim 2, characterized in that the rod consists of a front rod and a rear rod sandwiching a piston, the front rod is capable of following the piston and has a bolt connected to its tip, and either a handle or a wrench, which is a rotation operating means, can be attached and detached to the rear end of the rear rod.

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