JPH0719359U - Vibration suppressor for rolls in hot dip bath - Google Patents

Abstract

(57) [Summary] [Purpose] A roll in a plating bath, which is connected to a rotary drive motor outside the hot dip plating bath and is rotationally driven, is likely to generate rotational vibration due to pulsation of the peripheral velocity due to the drive system. This rotational vibration (which causes flapping vibration of the plated steel strip S derived from the plating bath and causes nonuniformity of the coating weight of the plating) is prevented. The [Configuration] arm 51, rotatably secured through a horizontal pin 52 on the roll support 20, to form a Replace that rotates in a vertical plane the horizontal pin 52 as a fulcrum, the leading end portion 51 ₁ of the arm Then, it is brought into contact with the shaft portion 12 of the roll 10 in the bath and a downward pressing force is applied to suppress the rotational vibration of the roll 10. The pressing force applied to the roll shaft portion 12 is adjusted by rotating the arm 51. Proximal end 51 ₂ of the arm includes an arm fixing device 54 for fixing the arm 51 at an arbitrary rotational angular position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for dipping a bath in a continuous hot dip galvanizing line, which is connected to a rotary drive system outside the bath, and suppresses vibration of the roll due to the drive system.

[0002]

[Prior art]

In the continuous hot dip galvanizing line, as shown in FIG. 5, the steel strip S to be plated descends from above the plating bath M and is introduced into the bath, and turns upward along the sink roll Rs in the bath. , Passes through the support rolls 10 and is discharged onto the bath. A gas wiping device Gw is installed directly above the bath, and the steel strip S is controlled by the wiping action of the pressurized gas flow ejected from its nozzle to control the amount of plated metal deposited on the steel strip surface and proceed to the next process. Be transferred. The support rolls 10 and 10 in the plating bath have the role of pressing the steel strip S from both sides to correct the warp deformation of the steel strip, and at the same time aligning the steel strip S with a predetermined pass line and leading it out onto the bath. is doing. Reference numeral 20 is a support for the support rolls 10, 10, the tip end 20 ₁ is immersed in the bath, and the base end 20 ₂ is located outside the bath and fixed in the space. Each of the support rolls 10 and 10 has a shaft 13 on the left and right sides surrounded by a bearing 13, and is held by a tip 20 ₁ (roll shaft supporting part) of a roll support 20 via the bearing 13.

As shown in FIG. 6, the support rolls 10 and 10, unlike the sink roll R _S (which is a non-driving roll), include rotary drive devices 30 and 30, respectively. The rotation drive device 30 is required because these rolls are rolls having a small diameter, unlike the sink roll R _S, and the winding angle of the steel strip S that comes into contact with the surface of the body is small. It is difficult to carry out stable rotational movement that matches the running of the steel strip only by the frictional force at the contact interface (when the steel strip slips due to the irregular rotation, the plating layer on the surface of the steel strip is flawed). Because. The rotary drive unit 30 is composed of a drive motor 31 outside the bath, a speed reducer 32, a universal joint 33, a spindle shaft 34, etc., and a universal joint 33 is provided between the rotary drive system outside the bath and the roll 10 in the bath. , Is connected to a cross-spin coupling 35 on the end surface of the roll shaft via a spindle shaft 34 that is inclined.

[0004]

[Problems to be solved by the device]

 As described above, since the spindle shaft 34 that transmits the rotational driving force of the drive motor 31 of the rotary drive device 30 to the roll 10 in the bath has an inclined posture from above the bath to during the bath, the speed is transmitted to the roll 10. Does not transmit at a constant velocity, causing pulsation in the angular velocity of the roll. The pulsation of this angular velocity causes the support roll to vibrate, and its rotational vibration causes flapping (corrugation vibration in the direction perpendicular to the plate surface) on the steel strip S at the rising portion of the plating bath. When flapping occurs on the steel strip S, the horizontal distance between the surface of the steel strip and the tip of the nozzle of the gas wiping device when passing through the gas wiping device Gw periodically changes in perspective (the perspective change is the surface of the steel strip). As a result, there is a periodic fluctuation in the strength of the wiping action of the pressurized gas flow that is applied to). When the strip of steel strips is so large that the surface of the strip of gas wiping equipment comes into contact with the surface of the strip, scratches may occur due to the contact and plating metal may adhere to the tip of the strip nozzle, causing problems such as nozzle clogging. It also causes it.

As a countermeasure, a one-way clutch that transmits a driving load only in a specific direction and a fluid transmission device such as a fluid coupling or a torque converter are provided between the roll and the drive motor, and the roll is operated at a line speed (steel strip). In a rotational motion state that is synchronized with the running speed), the one-way clutch idles, and when pulsation with the drive motor occurs and the line speed does not match, the one-way clutch transmits the drive load. There has been proposed a device which prevents the pulsation of the angular velocity of the roll and the flapping of the steel strip (Japanese Patent Laid-Open No. 5-70919, etc.). However, the method of absorbing and adjusting the load fluctuation of the roll in the bath by incorporating such a fluid transmission device requires high equipment cost, and when the load fluctuation of the roll in the bath occurs, the roll is adjusted during the load adjustment. There is a drawback that the rotation becomes unstable. Therefore, the present invention is intended to provide a vibration suppressing device which is relatively inexpensive and which can effectively suppress the rotational vibration of the roll by a simple operation.

[0006]

[Means for Solving the Problems]

This invention is carried through the bearing 13 to the roll shaft bearing portion 20 ₁ of the roll support member 20 which is fixed in space by immersing the roll shaft bearing portion 20 ₁ of the front end in the plating bath, and Yokugai is coupled to a rotary drive motor via an inclined arranged spindle shaft in the bath from a rotating device for preventing vibration bath roll 10 of a continuous hot-dip plating line, the proximal portion 51 ₂ is located in Yokugai and the arm 51 tip 51 ₁ reaches the upper surface of the shaft portion 12 of the bath roll 10, and fixed to the through horizontal pins 52 roll support 20 in rotation the self standing, and the fulcrum horizontal pin 52 By rotating the arm 51, the arm tip 51 ₁ is brought into contact with the shaft 12 of the bath roll to form a lever for exerting downward pressure, and the arm 51 is attached to the arm base end 51 _2. Arm fixing device 54 for fixing at an arbitrary rotation angle position It is characterized by having.

[0007]

[Action]

The arm 51 is rotated about the horizontal pin 52 as a fulcrum, its tip 51 ₁ (roll shaft retainer) is pressed against the roll shaft 12, and further downward pressing force is applied, whereby the roll vibration is caused. Is suppressed by the pressing force. Pressing force against the roll shaft 12 required for vibration suppression can be controlled as desired by adjusting the rotation angle of the arm 51, by fixing the base end portion 51 ₂ of the arm 51 in its rotational angular position, the roll axis The pressing force on the portion 12 is maintained stable during the line operation. Even when the shaft diameter of the roll shaft 12 changes, the pressing force required to suppress the rotational vibration of the roll is applied by the simple rotation operation of the arm 51 regardless of the size of the shaft diameter. Can be made.

[0008]

The present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a view of the roll shaft portion of FIG. 1 viewed from the front side of a steel strip. FIG. 3 is a plan view showing an arrangement state of the arms 51 with respect to the left and right shafts of each roll. In the drawings, the configuration other than the point that the roll vibration suppressing device 50 is provided is the same as that of the conventional one shown in FIGS. 5 and 6, and is the same member as that of FIGS. 5 and 6. Are given the same reference numerals. As shown in FIG. 1, the arm 51 is fixed to the roll supporting body 20 carrying the left and right shafts 12 of each roll 10 via a horizontal pin 52, and is a rotatable rod having the horizontal pin 52 as a fulcrum. Is forming. The tip portion 51 ₁ of the arm 51 is located on the shaft portion 12 of the support roll 10 in order to exert a downward pressing force on the shaft portion 12, and the base end portion 51 ₂ extends on the bath. Further, the base end portion 51 ₂ of the arm 51, arm fixing device 54 for fixing the arm 51 at a predetermined rotational angular position is provided. As shown in FIG. 3, the arm 51, the arm fixing device 54, and the like are arranged corresponding to the left and right shaft portions 12 of each roll 10, and the arm 51, the horizontal pin 52, and the arm fixing device 54. The roll vibration suppressing device 50 is configured by the above.

The arm fixing device 54 on the base end side of the arm 51 in FIG.₁, The screw rod 54₁Nut 54 screwed onto_Four, 54_FourEtc., each screw rod 54 ₁ Lower end 54 of₂Is pin 54₃Rotatably by the base end 20 of the roll support 20.₂Have been laid up. Arm base end 51₂The screw rod 54₁Through-hole 51 with a hole diameter larger than the diameter of₃Is provided, and the through hole 51₃Screw rod 54₁The nut 54_Four, 54_FourArm base end 51₂Is sandwiched from above and below. Arm tip 51₁The rotation operation of the arm 51 for adjusting the pressing force on the roll shaft portion 12 of the₂The nut 54 of the arm fixing device 54 that holds the_Four, 54_FourLoosen the arm base end 51₂With the operation lever 53 attached to the arm base end 51₂By displacing upward or downward by the required amount.

FIG. 4 shows an adjusting operation of the rotation angle position of the arm 51. The nuts 54 ₄ and 54 ₄ of the arm fixing device 54 are loosened, and the arm base end 51 ₂ is moved upward along the screw rod 54 ₁ by the operating lever 53 (with this, the screw rod 54 ₁ is supported by the pin 54 ₃ as a fulcrum). when the the tilting) is, the arm 51 is rotated (counterclockwise direction) and arm tip portions as a fulcrum horizontal pin 52 (the roll axis pressing portion) 51 ₁ is displaced downward. On the contrary, if the arm base end 51 ₂ is pushed down along the screw rod 54 ₁ , the arm tip (roll shaft retainer) 51 ₁ is displaced upward by the rotation (clockwise direction) of the arm 51. To do. By displacing the arm tip portion 51 ₁ upward or downward by a desired amount and tightening the arm base end portion 51 ₂ from above and below with the nuts 54 ₄ and 54 ₄ , the arm tip portion 51 ₁ is moved to that position. Fixed. By the turning operation of the arm 51, the downward pressing force on the shaft portion 12 of the bath roll 10 is controlled, and the pressing force is stably maintained.

If the shaft diameter of the roll shaft 12 decreases as the plating line operation continues, the pressing force at the tip of the arm decreases, but in that case, the arm rotation position causes the arm fixing position. Readjustment may be performed at appropriate times to maintain the pressing force required to prevent vibration. The same applies when the rolls are replaced with different shaft diameters. In addition, as shown in FIG. 1, the support rolls 10 are usually arranged with their roll axes centered up and down by an appropriate amount, and the upper rolls are fixed in order to make the steel strip S match the pass line. In contrast to being fixed in position, the lower roll 10 is installed so as to move forward and backward in the horizontal direction with respect to the plate surface of the steel strip S because it is necessary to control the rolling force necessary for straightening the deformation of the steel strip. In the process, the advance / retreat drive control is performed at appropriate times. The change in position of the roll axis due to advances retreat driving of the rolls, the pressing force of the arm tip portion 51 ₁ is changed, together with its advancing drive control, the adjustment of the rotational operation and the arm fixed position of the arm By doing so, the required pressing force on the roll shaft portion 12 can be maintained.

Needless to say, the arm 51 needs to have corrosion resistance to the hot dip bath and rigidity to withstand the action of the pressing force to the roll shaft portion 12, but there is no difficulty in selecting its material type, for example, The same heat resistant steel as the roll support 20 (JIS G4311 SU H309 etc.) may be applied.

[0013]

[Effect of device]

 The device of the present invention surely suppresses the rotational vibration of the roll in the plating bath by a simple rotation operation of the arm, and prevents flapping of the steel strip to be plated, the deterioration of the plating quality and troubles in the plating operation. be able to. The equipment structure is simple, the equipment cost is low, it can be easily applied to the existing plating bath, and it is highly practical.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vibration suppressing device of the present invention.

FIG. 2 is a side view showing a roll shaft portion of FIG.

FIG. 3 is a plan view showing an arrangement of the vibration prevention device of FIG.

FIG. 4 is an operation explanatory view of the rotation vibration preventing device.

FIG. 5 is a front view showing a plating bath, a roll in the bath, and a roll supporting device of a continuous hot dip galvanizing apparatus.

FIG. 6 is an elevational view showing a roll in a plating bath and a roll rotation driving device.

[Explanation of symbols]

10: Support roll, 11: Roll body,
12: Roll shaft portion 13: Bearing, 20: Roll support member, 20 ₁ : Roll shaft supporting portion, 20 ₂ : Base end portion, 30: Roll rotation drive device, 31: Drive motor, 32: Reducer, 3
3: Universal joint, 34: Spindle shaft, 35: Coupling in bath, 50: Roll vibration preventing device, 51: Arm, 51 ₁ : Arm tip part (roll shaft pressing part), 51 ₂ : Arm base end part,
51 ₃ : screw rod insertion hole, 52: horizontal pin,
53: operating lever, 54: arm fixing device,
54 ₁ : screw rod, 54 ₂ : lower end of screw rod, 54
₃ : Pin, 54 ₄ : Nut, M: Hot dip bath,
S: Steel strip to be plated, R _S : Sink roll,
Gw: Gas wiping device,

Claims (1)

[Scope of utility model registration request] 1. A supported through a bearing 13 to the roll shaft bearing portion 20 ₁ of the front end of the roll shaft bearing portion 20 _first roll support 20 which is fixed in space by immersion in a plating bath, and Yokugai Is a device for preventing rotational vibration of the in-bath roll 10 of the continuous hot dip galvanizing line connected to the rotary driving device of the base end part 51 ₂ is located outside the bath, and the tip part 51 ₁ is the shaft of the in-bath roll 10. The arm 51 reaching the upper surface of the portion 12 is rotatably fixed to the roll support body 20 via a horizontal pin 52, and the arm tip portion 51 ₁ is rolled in the bath by a rotating operation using the horizontal pin 52 as a fulcrum. A lever for abutting against the shaft portion 12 of the arm for exerting downward pressure force is formed.
1 to _2, the vibration suppression apparatus of the roll in the molten coating bath, characterized in that an arm fixing device 54 for fixing the arm 51 at an arbitrary rotational angular position.