JPH04145231A - Power transmission device for driving bathing roll in continuous hot-dipping device - Google Patents

Abstract

PURPOSE:To suppress vibration by using a second universal joint connected to a bathing roll as a tripod type constant velocity joint provided with three rollers, and a guide portion, whose inner diameter is increased toward the tip at the opening end of a tripod insertion hole. CONSTITUTION:A second universal joint is composed of a housing 50 and a tripod 51, and connected to a roll shaft 52 and a driving shaft 27. A tripod insertion hole 59 is formed on a left end face of the housing 50. Also, roller fitting grooves 61 having substantially semi-circular shape in the sections thereof are formed, and a pair of orbit surfaces are formed in the vicinity of each of the grooves 61. A tapered portion 63 whose inner diameter is increased toward the left end is formed on a left end opening of the insertion hole 59, while a tapered portion 64 is formed around the grooves 61, thereby a guide portion 80 is comprised. The tripod is easily inserted even in case displacement or phase difference in a rotational direction exists between a bathing roll and an intermediate shaft, and chattering vibration is suppressed low.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention applies to bath rolls such as snap rolls and zinc rolls installed during the plating process of continuous hot-dip plating equipment that coats metal strip steel with zinc, tin, etc. The present invention relates to a power transmission device that transmits driving force.

Conventional technology The snap roll installed during the plating process of continuous hot-dip plating equipment suppresses the flapping of the plated steel strip and squeezes out the hot-dip plated material to achieve a stable coating weight. The roll is driven at a constant speed so that the outer circumferential speed of the roll is the same or a few percent lower than the speed.

As a power transmission device for driving such a snap roll,
It is common to use two universal joints (1) and (2) as shown in FIG.

In the apparatus shown in Fig. 7, the rotational driving force of the electric motor (4) installed outside the plating tank (3) is transmitted through the reducer (5) outside the tank (3) and the first universal joint (1). Intermediate shaft (6)
and further placed in the plating bath (A).
It is transmitted to the snap roll (7) via the universal joint (2).

An example of two universal joints (1) (2) is shown in FIG.

This universal joint is comprised of a cylindrical member (8) attached to one of two shafts and a joint head (9) attached to the other. For example, two cutout grooves (lO
) are formed at equal intervals in the circumferential direction. For example, two radial bins (11) are provided on the joint head (9) at equal intervals in the circumferential direction. The two pins (11) of the coupling head (9) are then fitted into the two cutout grooves (10) of the cylindrical member (8). The cylindrical member (8) of the first universal joint (1) is connected to the intermediate shaft (6), and the joint head (9) is connected to the output shaft of the reducer (5). The cylindrical member (8) of the second universal joint (2) is connected to the intermediate shaft (6), and the joint head (9) is connected to the roll shaft of the snap roll (7). And reducer (
5) and the intermediate shaft (6) are the snap rolls (7) between the joint head (9) of the first universal joint (1) and the cylindrical member (8).
) and the intermediate shaft (6) are respectively attached and detached between the joint head (9) of the second universal joint (2) and the cylindrical member (8).

In such a bottle-type universal joint, if the input shaft and output shaft are arranged at an angle (not arranged in a straight line), the angular velocity of the output shaft will change even if the input shaft rotates at a constant angular velocity. varies. In other words, the bottle-type universal joint alone has inconstant velocity and does not have constant velocity.

In the continuous hot-dip plating apparatus as described above, it is necessary to rotate the snap roll (7) at a constant speed.
Two pin-type universal joints (1) and (2) are used to cancel the inconsistency of each universal joint (1) and (2) to create a snap roll (
7) are assembled with their phases matched in order to rotate at a constant speed.

Problems to be Solved by the Invention However, it is impossible to supply oil to the universal joint in a hot-dip galvanizing bath, and the bath temperature in a hot-dip galvanizing bath is as high as approximately 450°C or higher. External lubrication is not possible. Therefore, the bottle (11) of the universal joint (2) in the bath and the notched groove (1
The sliding parts such as 0) wear out much faster than the sliding parts of the universal joint (1) outside the bath. Such wear can be caused by rattling of the universal joint (2) itself or between the two universal joints (
1) The phase difference between Become.

On the other hand, the second universal joint (2) in the plating bath is required to be easy to assemble. In other words, the snap roll (7) in the plating bath and the intermediate shaft (6) are attached and detached at the second universal joint (2) as described above, but due to the roll exchange method and the equipment, The joint (2) is attached and detached during plating. Therefore, even if there is a misalignment error or rotational phase error between the snap roll (7) and the intermediate shaft (6), it is necessary to be able to easily assemble the universal joint (2). In a bottle type universal joint such as
It is difficult to assemble this when it is placed in a bath.

An object of the present invention is to provide a power transmission device for driving rolls in a bath of a continuous hot-dip plating apparatus that solves all of the above problems.

Means for Solving the Problems A power transmission device for driving a submerged roll of a continuous hot-dip plating apparatus according to the present invention includes a first universal joint located outside the base and a second universal joint located inside the base.
In a power transmission device for driving a bath roll of a continuous hot-dip plating apparatus, the universal joint is connected to the bath roll by an intermediate shaft, the first universal joint is connected to the drive device, and the second universal joint is connected to the bath roll. , the first universal joint is a constant velocity universal joint, and the second universal joint is
A housing with three roller fitting grooves formed around a tripod insertion hole formed on an end face, and three rollers that are inserted into the tripod insertion hole of the housing and fit into the roller fitting grooves of the housing on the outer periphery. This is a tripod-type constant velocity constant velocity joint consisting of a tripod with a cylindrical shape, and is characterized in that a guide portion whose inner diameter increases toward the tip is provided at the open end of the tripod insertion hole of the housing. be.

Since the two universal joints, one outside the bath and the other in the bath, are constant velocity universal joints, there is a risk of wear and tear on the components of the universal joint in the bath.
Even if erosion progresses and a phase difference occurs between the two universal joints, uniform velocity is not lost, and angular velocity fluctuations and chatter vibrations are kept extremely small.

The second universal joint placed in the bath is a tripod type constant velocity universal joint, and the opening end of the tripod insertion hole in the housing is provided with a guide portion whose inner diameter increases toward the tip. Even if there is a misalignment error or rotational phase error between the middle roll and the intermediate shaft, the tripod can be easily inserted into the tripod insertion hole of the housing, and the three rollers of the tripod can be inserted into the roller fitting grooves of the housing. It can be fitted. In addition, tripod type constant velocity universal joints have a larger contact area than bottle type universal joints, and while bottle type universal joints only have sliding contact, tripod type constant velocity universal joints also have rolling contact and have a long lifespan. will improve.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6.

Figures 1 and 2 show a power transmission device (23) for driving a snap roll (21) and a zinc roll (22) installed in a plating bath (A) of a plating tank (20) of a continuous hot-dip plating apparatus. (24) is shown. 2 rolls (2
1) (22) are arranged horizontally and in parallel in the plating bath (A) at predetermined intervals in the vertical and horizontal directions. Note that these rolls (21N22) and their arrangement are well known, so a detailed explanation will be omitted.

Since the two power transmission devices (23) and (24) are the same, the power transmission device (23) of the snap roll (21) will be described below. In addition, zinc roll (22
) about the power transmission device (24) of the snap roll (
The same parts as the power transmission device (23) in 21) are given the same reference numerals.

As shown in FIGS. 1 and 2, a first universal joint (25) placed outside the bath (20) and a second universal joint (26) placed in the plating bath (A) are located in the middle. They are connected by a shaft (27). The first universal joint (25) is connected to the tank (2
The drive device (29) installed on the stand (28) outside the
) is connected to. The second universal joint (26) is connected to a snap roll (21) in the plating bath (A). The drive device (29) is placed on the left side in FIGS. 1 and 2, and the snap roll (21) is placed on the right side in the same figures.

In the following description, the left and right sides of FIG. 1 and FIG. 2 are referred to as left and right.

The drive device (29) is configured as follows, for example.

On the stand (28), an electric motor (30) and a reducer (31
), a first bearing (32), a hydraulic cylinder (33), and a bearing guide (34) are installed in this order from the left. A first drive shaft (35) connected to the output shaft of the speed reducer (31) is supported by the first bearing (32) so that it rotates but does not move in the axial direction. Then, the rotation of the motor (30) is reduced by the reducer (31) and the first drive shaft (
35). On the bearing guide (34), the second
A bearing (36) is mounted so as to be movable in the left and right direction. A second drive shaft (37) is supported by the second bearing (36) so that it can rotate but not move in the axial direction. The right end portion of the first drive shaft (35) and the left end portion of the second drive shaft (37) are arranged so that they do not rotate relative to each other but can move in the axial direction, for example, by a slide joint such as a spline. is connected to. Second drive shaft (3
The right end portion of 7) is connected to the first universal joint (25). The rotation of the first drive shaft (35) is transmitted to the snap roll (21) via the second drive shaft (37), the first universal joint (25), the intermediate shaft (27), and the second universal joint (26).
). The second bearing (36) is connected to a hydraulic cylinder (
33), which allows the guide (34)
You can move the top left and right. In this way, the second bearing (36
) moves left and right, the second drive shaft (37) and the first
The universal joint (25) also moves left and right. Note that normally, the second bearing (36) is stopped at the right end portion on the guide (34).

As the first universal joint (25), a suitable constant velocity universal joint, such as a double cardan type constant velocity universal joint as described in Japanese Utility Model Application Publication No. 59-4824, is used.

A suitable platform (38) between the drive (29) and the tank (20)
A support device (39) is provided above the intermediate shaft (27) for supporting the intermediate shaft (27) during roll replacement or the like.

This support device (39) is connected to the tank (20) of the intermediate shaft (27).
Hydraulic jack (40) located under the external part of the
, an elevating member (41) that is raised and lowered by this, and an intermediate shaft (2) that is horizontally arranged at the upper end of the elevating member (41).
7) and a support member (42) that supports the. Note that normally, the elevating member (41) is lowered, and the supporting member (42) is spaced downward from the intermediate shaft (27).

A tripod type constant velocity universal joint is used for the second universal joint (26).

As shown in detail in Figures 3 to 6, the second universal joint (2
6) is composed of a cylindrical housing (50) and a ring-shaped tripod (51).

A circular connection hole (53) for connecting the housing (50) to the end of the roll shaft (52) of the snap roll (21) is formed in the right end surface of the housing (50). Housing (50
) is formed with a tapered hole (54) that extends diametrically through the housing (50) and is perpendicular to the connecting hole (53). Housing on the small diameter side of the tapered hole (54) (
50) is slightly removed to form a flat surface (55) perpendicular to the tapered hole (54). Roll axis (5
2) is inserted into the connecting hole (53), and the taper pin (
56) to the housing (50).

The tapered pin (56) is connected to the tapered hole (54) of the housing (50) and the tapered hole (54) formed in the roll shaft (52).
7). A male thread (56a) is formed at the small diameter end of the taper pin (56), and the flat surface (56a)
5) Attach the nut (58) to the male threaded part (56a) that protrudes from the
The taper pin (56) is fixed by being screwed into place.

A circular tripod insertion hole (59) is formed on the left end surface of the housing (50), and is separated from the connection hole (53) by an intermediate wall (60). Around the insertion hole (59), three roller fitting grooves (61) having a substantially semicircular cross section extending in the axial direction and reaching the opening end of the hole (59) are formed at equal intervals in the circumferential direction. and these grooves (61)
The bottom surface (61a) of the insertion hole (59) matches the bottom surface (59a) of the insertion hole (59). A pair of raceway surfaces (62) are formed at two locations in the circumferential direction near the insertion hole (59) of each groove (61). The axis of these pair of raceway surfaces (62) is the insertion hole (5).
It forms part of a cylindrical surface parallel to the axis of the groove (61) and having a slightly smaller radius than the groove (61). A tapered portion 63) whose inner diameter becomes larger toward the left end is formed at the left open end of the insertion hole (59), and a tapered portion (63) whose inner diameter becomes larger toward the left end is formed around the groove (61). 64
) are formed so as to be continuous with the tapered portion (63), and these form a guide portion (80).

The tip cylindrical part (
65) is formed, and a tip spherical part (66) centered at one point on the axis is formed at the tip, and between these,
A tapered guide portion (67) is formed whose outer diameter becomes smaller toward the tip. Tripod (51
) is formed on the left side of the tip cylinder part (65), there is formed a tapered part (68) whose outer diameter becomes smaller as it goes to the left, and further to the left of that, a small diameter intermediate cylinder part (69) and a large diameter proximal cylinder part (68) are formed. A portion (70) is formed. A circular connection hole (71) for connecting the base end cylindrical part (70) to the end of the intermediate shaft (27) is formed in the left end surface of the base end columnar part (70). Proximal cylindrical part (
A tapered hole (72) is formed in the center of the tube (70), which is perpendicular to the connecting hole (71) and diametrically penetrates the proximal columnar portion (70). The outer periphery of the proximal cylindrical portion (70) on the small diameter side of the tapered hole (72) is slightly removed to form a flat surface (73) orthogonal to the tapered hole (72). Intermediate shaft (2
7) is inserted into the connecting hole (71), and as before, the tapered hole (72) of the proximal cylindrical portion (70) and the intermediate shaft (27)
The tapered bin (74) passed through the tapered hole (74) formed in the
75) and is connected to the tripod (51) by a nut (76) screwed into its male threaded portion (75a).

There are flat surfaces (77) parallel to the axis at three locations that equally divide the outer circumference of the tip cylindrical portion (65) of the tripod (51) in the circumferential direction.
is formed. A radially extending roller shaft (trunnion) (78) is screwed to the center of each flat surface (77), and a roller (79) is attached to each shaft (78). A flange (78a) is formed at the tip of the shaft (78) to prevent roller removal, and the roller (79) is connected to the flat surface (77) of the tripod (51) and the flange (78) of the shaft (78).
8a), and is attached to rotate and hang while moving in the axial direction.

The outer circumferential surface (79a) of the roller (79) forms part of a spherical surface centered at one point on the axis. Note that the axis (
78) is attached to the tripod (51) after attaching the roller (79).

The radius of the tip cylindrical portion (65) of the tripod (51) is smaller than the radius of the insertion hole (59) of the housing (50).

Furthermore, the radius of the outer peripheral surface of the roller (79) is
50) is equal to or slightly smaller than the radius of the pair of raceway surfaces (62). The right side portion of the tripod (51) protrudes to the right side from the rightmost portion of these rollers (79).

In the assembled state of the second universal joint (26), the portion of the tripod (51) on the right side of the tapered portion (68) is inserted into the insertion hole (59) of the housing (50).

Further, the roller shaft (78) is fitted into the roller fitting groove (61>) of the housing (5o) with a gap, and the roller (79) is sandwiched between the pair of raceway surfaces (62).

When the inclination of the tripod (51) with respect to the housing (50) changes, the inclination of the roller (79) with respect to the raceway surface (62) also changes, but the roller (79)
8) by moving in the axial direction of the roller (79).
The outer peripheral surface (79a) of is always in contact with the raceway surface (62). Although FIG. 3 shows a state in which the housing (5o) and the tripod (51) are arranged on a straight line, in reality, as shown in FIGS. 5 and 6, the intermediate shaft (27
) are arranged in an inclined manner, so the housing (50) and the tripod (51) are also arranged at a certain angle.

The roll shaft (52) and the intermediate shaft (27) are attached and detached between the housing (50) of the second universal joint (2B) and the tripod (51). From the connected state as shown in Figure 1 to the intermediate shaft (
27) from the roll shaft (52), the supporting device (
39) while supporting the intermediate shaft (27), the second bearing (36) is moved to the left by the hydraulic cylinder (33). As a result, the intermediate shaft (27) is pulled to the left, and the tripod (51) is separated from the housing (5o). When connecting the intermediate shaft (27) to the roll shaft (52), the second bearing (36) is moved to the right by the hydraulic cylinder (33) while the intermediate shaft (27) is supported by the support device (39). . This pushes the intermediate shaft (27) to the right and connects the tripod (51) to the housing (5o).

The outer diameter of the spherical tip portion (66) at the right end of the guide portion (67) of the tripod (51) is smaller than the outer diameter of the cylindrical tip portion (65). ) is smaller than the inner diameter of the housing (5
The inner diameter of the left end of the tapered part (63) of the guide part (80) of No. 0) is larger than the inner diameter of the insertion hole (59). Furthermore, the guide portion (8) is also provided around the roller fitting groove (61).
0) is formed.

Therefore, the tip of the tripod (51) can be easily inserted into the open end of the insertion hole (59) of the housing (50) even if the housing (5o) and the tripod (51) are not aligned accurately. You can do it, and then just use the tripod (
51) into the insertion hole (59), the housing (50) and tripod (51) can be automatically aligned, and the tripod (51) can be easily inserted into the insertion hole (59). The roller (79) can be fitted between the raceway surfaces (62) of the roller fitting groove (61). Also, since the tip of the tripod (51) protrudes to the left side of the roller (79), insert the tripod (51) into the insertion hole (59).
Even if the tripod (51) is inserted too far, the tip of the tripod (51) will first hit the insertion hole (59) of the housing (1) or the bottom surface (59a) (61a) of the groove (61), and the roller (79) is prevented from hitting these bottom surfaces (59a) (61a) and being damaged.

To prevent corrosion by the plating bath (A), each part of the second universal joint (26) is made of stainless steel metal, a ceramic material such as Co-based or W-based sprayed on the metal surface, or stainless steel. It is preferable to use steel-based materials, ceramics, etc. Also, between the roller shaft (78) and the roller (79) and between the roller (79) and the housing (5
0) and the raceway surface (62) by providing an appropriate clearance,
It is desirable that even if foreign matter gets caught in the plating bath (A) between these, it can be easily discharged.

In the above power transmission device (23) (24), since both the universal joints (25> and (28>) are constant velocity universal joints, the second universal joint (26) in the plating bath (A) is particularly susceptible to wear and tear. Erosion occurs and two universal joints (25) (2B)
Even if a phase difference occurs between them, uniformity of velocity is not lost and angular velocity fluctuations do not occur. Therefore, smooth rotation can be maintained for a long period of time.

In addition, in the case of a tripod type constant velocity universal joint, the roller (79)
makes surface sliding contact with the roller shaft (78), and makes linear rolling contact and micro-sliding contact with the raceway surface (62) of the housing (50), so that the life span is improved. While the lifespan of conventional bottle-type universal joints is about 10 days to one month, it can be expected to have a long lifespan of several months, which is more than three times that.

Effects of the Invention According to the power transmission device for driving a roll in a bath in a continuous hot-dip plating apparatus of the present invention, as described above, the uniform velocity of the roll in a bath is not lost, and angular velocity fluctuations and chatter vibrations are extremely small. Therefore, it is possible to suppress the vibration of the plating bath and the metal strip to an extremely low level, and to manufacture products of high quality. Furthermore, the second universal joint placed in the air can be easily assembled, and its lifespan is also improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a power transmission device for driving rolls in a bath of a continuous hot-dip plating apparatus showing an embodiment of the present invention, Fig. 2 is a plan view of the same, and Fig. 3 is a longitudinal cross-section of the second swivel wire. 4 is a sectional view taken along the line ■-■ in FIG. 3, FIG. 5 is a sectional view of the second universal joint showing one state in use, and FIG. 6 shows another state in use. A sectional view of the second universal joint, FIG. 7 is a partially cutaway side view of a power transmission device for driving rolls in a bath of a continuous hot-dip plating apparatus showing a conventional example, and FIG. 8 is an exploded perspective view of the universal joint shown in FIG. 7. It is. (20)...Plating tank, (21)...Snap roll, (22)...Zin roll, (23) (24)
...power transmission device, (25) ...first universal joint, (
26)...Second universal joint, (27)...Intermediate shaft, (
29)...Drive device, (50)...Housing, (
51)...Tripod, (59)...Tripod insertion hole, (61)...Roller fitting groove, (79)...
Roller, (80)...Guide part, (A)...Plating bath. Patent applicant: Sumitomo Metal Industries, Ltd. Figure 7 Figure 8

Claims (1)

[Claims] A first universal joint placed outside the bath and a second universal joint placed inside the bath.
In a power transmission device for driving a bath roll of a continuous hot-dip plating apparatus, the universal joint is connected to the bath roll by an intermediate shaft, the first universal joint is connected to the drive device, and the second universal joint is connected to the bath roll. , the first universal joint is a constant velocity universal joint, and the second universal joint is
A housing with three roller fitting grooves formed around a tripod insertion hole formed on an end face, and three rollers that are inserted into the tripod insertion hole of the housing and fit into the roller fitting grooves of the housing on the outer periphery. It is a tripod-type constant velocity universal joint consisting of tripods with continuous hot-dip plating, characterized in that the opening end of the tripod insertion hole of the housing is provided with a guide part whose inner diameter increases toward the tip. Power transmission device for driving rolls in the bath of the equipment.