JPH0733970U - Roller driving device in plating bath - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the bending of the spindle that transmits the driving force to the roll in the bath in the drive device for the roll in the molten metal plating bath. [Structure] A spring 19 which is displaceable in the axial direction when an excessive axial compression force B is applied to the transmission shaft 7 portion directly connected to the spindle 1 is incorporated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for driving a roll in a plating bath used in a continuous hot-dip galvanizing line or the like, and more specifically to a device for preventing bending of a spindle that transmits a driving force from the outside of the bath to the roll in the bath.

[0002]

[Prior art]

 As shown in FIG. 1, the in-bath roll drive of a plating apparatus that has been widely used in a continuous hot-dip galvanizing line is a method of transmitting a rotational force from outside the plating bath 2 to a in-bath roll 3 via a spindle 1 as shown in FIG. It is used. As a driving device 10 for the in-bath roll 3, a slidable shaft joint for facilitating connection between the spindle 1 and the in-bath roll 3 when the motor 4, the transmission 5, and the in-bath roll 3 are installed in the line outside the plating bath 2 6, a power transmission shaft 7, a universal joint 8 and the like are installed. Further, one end of the spindle 1 is connected to the universal joint 8 and the other end immersed in the plating bath is connected to the in-bath roll 3 via a roll coupling 9. Connected. The connection between the roll coupling 9 and the spindle 1 is such that two or more pins attached to the tip of the spindle are fitted in grooves corresponding to the two or more pins provided in the length direction of the roll coupling, that is, the bath. The structure is such that it can slide freely in the axial direction of the middle roll and can reliably transmit the rotational force. The slide of the spindle 1 is such that a slide base 13 rotatably supporting a transmission shaft 7 on a fixed frame 14 is driven by an air motor 11 to drive a screw shaft 12 to slide.

By the way, the plating roll, particularly the bath roll, the bath roll support member, the spindle and the like are installed in a hot molten zinc bath. Therefore, since a considerably large thermal expansion occurs, the connection between the roll coupling and the spindle is installed beforehand in consideration of the expansion margin of the roll. In addition, the axial fixation (thrust) of the roll in the bath is set to be quite loose, and the member wears in proportion to the plating work time. Therefore, the amount of displacement in the roll axial direction (due to thermal expansion) The elongation and wear of the thrust receiving member) are large.

As described above, the amount of displacement in the roll axis direction (due to elongation and backlash) contains many uncertain elements, and during the plating operation, the spindle is displaced more than expected and a compressive load is applied to the spindle. May occur. If excessive spindle compression load is applied to the spindle, the spindle will bend. As described above, the degree of engagement between the roll coupling and the spindle tip varies from moment to moment, and therefore, the roll coupling and the spindle tip often come into contact with each other during the plating operation. At this time, axial compression force is generated in the spindle, which causes a problem that the spindle is bent.

On the other hand, as the bearing for the in-bath roll is installed in the molten zinc bath, a slide bearing has been used conventionally because of the necessity of withstanding high temperature and corrosion. Due to the structure of this slide bearing, the fit between the roll shaft and the bearing is loose and there is a gap of several mm. It is well known that the clearance between these bearings increases in proportion to the plating work time.

Since the bending of the spindle and the backlash of the roll bearing are combined, the roll in the bath is forced to rotate while changing its rotational center position, so that the strip drawn from the plating bath causes periodic vibration, This causes a periodical change in the distance between the wiping nozzle and the strip at the wiping point, resulting in non-uniform zinc adhesion.

[0007]

[Problems to be solved by the device]

 Thus, there is a problem that the spindle is bent due to the axial compressive load applied to the spindle. When the spindle is bent, the bearing of the bath roll that is about to be driven uses a sliding bearing that has play (skimmer). Therefore, the rotation of the bath roll becomes unstable because it is rotationally driven with play. As a result, the strip drawn from the plating bath is vibrated, and the spacing between the wiping nozzle and the strip periodically changes at the wiping point on the plating bath, resulting in an uneven wiping force. As a result, there is a problem in that the amount of plating applied becomes uneven.

An object of the present invention is to propose a driving device for a roll in a plating bath, which prevents the bending of the spindle, which makes it possible to reduce such problems.

[0009]

[Means for Solving the Problems]

 The present invention relates to a device for driving a roll in a plating bath of a continuous molten metal plating line, in which a power transmission shaft 7 for transmitting a rotational force is penetrated from a drive unit 10 outside the plating bath to a spindle 1 for driving the roll 3 in the plating bath. A spring 19 as a cushion member is mounted between a pedestal 17 fixed to the slide base 13 and a ring 18 attached to the power transmission shaft 7 on the side of the universal joint 8 from this pedestal in a non-contact manner. Between the ring 18 and the stepped portion 21 provided on the power transmission shaft 7 on the universal joint side, the axial force applied to the power transmission shaft from the universal joint side is acted on the spring 19 via the ring 18. This is a roll driving device in a plating bath, which is equipped with a bearing 20 capable of performing this.

[0010]

[Action]

 In the present invention, a cushion (spring) that is displaceable in the direction of the axial force when an excessive axial compressive force is applied to the transmission shaft directly connected to the spindle is incorporated into the spindle, so that an axial force above a predetermined level is applied to the spindle. When actuated, the spring compresses, so that an excessive axial compressive load is not applied to the spindle, and the spindle does not have a problem such as bending.

[0011]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 2, the shaft compression force absorbing device 16 of the present invention is incorporated between the power transmission shaft 7 support bearing 15 on the slide base 13. The pedestal 17 is fixed to the slide base 13 by penetrating the power transmission shaft 7. A ring 18 is attached to the universal joint 8 side of the pedestal 17 so as not to contact the power transmission shaft 7. A spring 19 as a cushion member is attached between the two. A bearing that is rotatable between the ring 18 and the stepped portion 21 provided on the power transmission shaft 7 and that can exert a shaft compression force acting from the side of the universal joint 8 on the spring 19 via the ring 18 ( (Thrust bearing is used here) 20 is attached.

If a force (axial compression force) A in the direction of the arrow in the drawing acts on the spindle 1, the force is applied to the power transmission shaft 7 via the universal joint 8 in the direction of the arrow B. Then, a force in the direction of arrow B is applied to the spring 19 via the bearing 20 and the ring 18, and the spring 19 is compressed and deformed according to the applied load. Since the pedestal 17 is fixed to the slide base 13, its position is maintained, and the power transmission shaft 7 slides leftward in the drawing by the compression deformation amount of the spring 19, and its displacement is caused by the slide type shaft coupling 6. Be absorbed.

The strength of the spring 19 needs to be almost not compressed when the spindle 1 is fitted into the roll coupling 9, and when the spindle 1 is subjected to an excessive axial compression force, the spring 19 is compressed and excessive compression force is applied. Must be selected so that it can absorb.

[0014]

[Effect of device]

 The following effects can be obtained by using the roll driving device in the plating bath of the present invention. (1) Since the spindle does not bend, vibration does not occur in the strip rising from the plating bath, so stable wiping at the wiping point is possible and stable production of high-quality plated products is possible. it can. (2) Since the spindle does not bend, the cost and time for replacing the spindle can be saved, which improves productivity and reduces maintenance costs.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional typical roll driving device in a plating bath.

FIG. 2 is an explanatory view of a roll driving device in a plating bath incorporating the present invention.

[Explanation of symbols]

 1 spindle 2 plating bath 3 bath roll 4 motor 5 transmission 6 slide type shaft coupling 7 power transmission shaft 8 universal joint 9 roll coupling 10 drive device 11 air motor 12 screw shaft 13 slide base 14 fixed frame 15 bearing 16 shaft compression force Absorber 17 Stand 18 Ring 19 Spring 20 Bearing 21 Stepped part

Claims (1)

[Scope of utility model registration request] 1. A drive device for a roll in a plating bath of a continuous molten metal plating line penetrates a power transmission shaft 7 for transmitting a rotational force from a drive unit 10 outside the plating bath to a spindle 1 for driving a roll 3 in the plating bath. Then, a spring 19 as a cushion member is mounted between a frame 17 fixed to the slide base 13 and a ring 18 attached to the power transmission shaft 7 on the side of the universal joint 8 from this frame in a non-contact manner. Between the ring 18 and the stepped portion 21 provided on the power transmission shaft 7 on the universal joint side, and the axial force applied to the power transmission shaft from the universal joint side is applied to the spring 19 via the ring 18. A drive device for a roll in a plating bath, which is equipped with a bearing 20 that can be used.