JP7458539B2 - Bellows adjustment method and bellows adjustment device - Google Patents

Description

Embodiments of the present invention relate to a bellows adjustment method and a bellows adjustment device.

In the domestic power substation business, we expect to see an increase in investment in renewal work for aged equipment delivered during the power system expansion period and in new and expanded equipment as connections to distributed power supply systems increase. Currently, the mainstream of new 500kV gas insulated switchgear (GIS: Gas Insulated Switchgear) is the integrated on-base type, but due to transportation restrictions, the attachable and detachable busbars between lines are sent separately. The compression and expansion work of the bellows (or bellows) is carried out manually by workers on site.

To install the attachment/detachment device, first, the unit, which was shipped separately, is compressed in the bellows part in a simple dust-proof area and the internal conductor is assembled, and then lifted using heavy equipment and attached to the main bus bar. After the connecting conductor is attached, the bellows is expanded to complete the bus connection between the lines. The compression work and expansion work of the bellows are performed using stud bolts for compression work and expansion work provided in the attachment/detachment device. Currently, the entire bellows is compressed and expanded uniformly in the compression and expansion directions by turning nuts inserted through the stud bolts (4 pieces) and in contact with the flanges. In this case, four nuts are turned synchronously by four workers to uniformly compress and expand the bellows.

Japanese Patent Application Publication No. 2000-115970

In the conventional construction method, the resistance of the nut in contact with the flange is large during the compression and expansion work of the bellows, and the work is time-consuming and exhausting for the worker. To turn the bolt during bellows compression and expansion work, the larger the diameter, the higher the strength of the bellows, and the compression and expansion work requires a great deal of strength and physical strength, and is carried out by changing workers. are doing.

Further, electric tools and hydraulic tools cannot be used on nuts inserted into stud bolts. Furthermore, box wrenches cannot be used; only spanners can be used.

In addition, the friction of the nuts that come into contact with the flanges is high, making it difficult for four workers to rotate them in sync. The bellows are compressed and expanded by tightening and loosening the nuts inserted into the stud bolts, and since the entire bellows needs to be compressed and expanded uniformly, four workers are required at the same time. The man-hours required per line are 12 people in total, consisting of eight people (four people/day x two days) for compressing the bellows and four people (four people/day x one day) for expanding the bellows.

A normal gas insulated switchgear is equipped with A and B busbars. In the case of two circuits, each bus is provided with a bellows at one location between the two circuits, so the gas-insulated switchgear is equipped with bellows at two locations in total on the first and second buses. Furthermore, in the case of 5 circuits, bellows are provided at 4 locations between the 5 circuits on each bus, so the gas insulated switchgear is equipped with bellows at a total of 8 locations on the first and second buses. In addition to the attachment/detachment device, bellows are also used to adjust the dimensions of the busbar to the bushing. Since the gas insulated switchgear is equipped with many bellows, adjusting the bellows is a burdensome task for workers installing modern equipment. Because gas-insulated switchgear requires insulation, it does not like dust and moisture, so work may be interrupted not only on rainy days, but also on cloudy days when rain is predicted.As this work takes time, it is difficult to assemble the attachment/detachment device. This was not possible and was causing a hindrance to the construction work.

It can be assumed that placing a bearing between the bellows flange and the expansion operation nut would reduce friction and improve workability, but the bearing cannot be removed after the equipment is installed.

The problem to be solved by the present invention is to facilitate the operation of rotating a nut when a force (thrust) is acting in the axial direction of the nut to be rotated, especially the operation of compressing or expanding the bellows by the operator. That's true.

The bellows adjustment method according to the embodiment includes: a bellows, a pair of opposing flanges provided on both sides of the bellows, a plurality of stud bolts erected from one flange and penetrating the other flange, and these plurality of studs. Each bolt has an inner nut and an outer nut provided on the inside and outside of the other flange to fix the position of the other flange with respect to each stud bolt, and the other flange is moved with respect to each stud bolt. The bellows is compressed/expanded. The bellows adjustment method includes (1) preparing a thrust bearing that can be connected and separated in the circumferential direction and has an annular shape when connected; and (2) selecting the (3) selecting a stud bolt for compressing/expanding a smaller number of the bellows than a plurality of stud bolts; and (3) compressing or expanding the inner nut and outer nut of the selected stud bolt, and the bellows. (4) loosening one of the inner or outer nuts on the selected stud bolt in response to the compression or expansion of the bellows; (5) tightening the nut on the thrust bearing side of the selected stud bolt to move the other flange; and (6) fixing the position of the other flange by tightening the remaining inner nuts and outer nuts of the selected and non-selected stud bolts after the movement; The method includes the steps of once loosening the nut and separating the thrust bearing from the stud bolt, and (7) tightening the once loosened nut.

FIG. 4 is a perspective view showing a state in which the bolt thrust bearing according to the embodiment is used. FIG. 2 is a perspective view showing each component of a thrust bearing for a bolt according to an embodiment. FIG. 2 is a perspective view showing a state in which a retainer is housed in a housing washer of a bolt thrust bearing according to an embodiment. FIG. 1 is a top view showing the configuration of a gas-insulated switchgear to which a bolt thrust bearing according to an embodiment is applied. FIG. 5 is a sectional view taken along line II of the gas-insulated switchgear shown in FIG. 4. The figure which shows the flange of the bellows in the gas insulated switchgear to which the thrust bearing for bolts which concerns on embodiment is applied. FIG. 3 is a schematic diagram showing the steps of bellows expansion work in the installation work of a gas-insulated switchgear to which the bolt thrust bearing according to the embodiment is applied. FIG. 3 is a schematic diagram showing a process of compressing a bellows in installation work of a gas-insulated switchgear to which a bolt thrust bearing according to an embodiment is applied.

Hereinafter, embodiments of a bellows adjustment method and a bellows adjustment device will be described in detail with reference to the drawings.

Figure 1 is a perspective view showing the use of a bolt thrust bearing according to an embodiment.

FIG. 1 shows a bolt thrust bearing (hereinafter simply referred to as a "bearing") 10 and a bolt (for example, a stud bolt V) according to an embodiment. The bearing 10 shown in FIG. 1 is shown after the respective parts are connected, that is, in a used state. The bearing 10 includes a shaft washer 1, a housing washer 2, and a retainer 3 (shown in FIG. 2) as parts. The shaft washer 1 is rotatable about the Z-axis with respect to the housing washer 2 due to the function of the retainer 3. Note that the insertion direction of the stud bolt V is defined as the Z-axis direction, and the orthogonal directions thereof are defined as the X-axis direction and the Y-axis direction, which are orthogonal to each other.

FIGS. 2A and 2B are perspective views showing each component of the bearing 10. FIG.

As shown in FIGS. 2(A) and 2(B), the bearing 10 includes k (k=2, 3,...) shaft elements (for example, two shaft elements 11, 12) and m (m= 2, 3, ...) housing elements (for example, two housing elements 21, 22) and n (n=2, 3, ...) cage elements (for example, two cage elements 31, 32). In addition, if the number of each element is three or more, it will take time to connect the elements and connect the parts in order to manufacture the bearing 10 on the stud bolt V (shown in Fig. 1), which will be described later. The number of elements is preferably two (half-split, two-split). Hereinafter, unless otherwise specified, an example will be described in which the number of each element is two (k=m=n=2).

Further, the bearing of the bearing 10 is not limited to a single type thrust ball bearing, but may be a double type thrust ball bearing.

The two shaft elements 11 and 12 together form the shaft washer 1. The two shaft elements 11 and 12 are provided with a shaft connection portion that connects them to each other in a detachable manner. For example, the shaft connecting portion is formed on the contact surface of the two shaft elements 11, 12, and is a concavo-convex portion P11, P12 that meshes with each other. The two shaft elements 11, 12 are connected by engaging the uneven portions P11, P12.

Additionally or alternatively, the two shaft elements 11, 12 each have a through hole Q11, Q12 that extends through the two shaft elements 11, 12, and a bolt and a nut that pass through the through holes Q11, Q12. and is provided as a shaft connection part. Then, the two shaft elements 11, 12 are connected by inserting a bolt through one opening of the through holes Q11, Q12, and screwing a nut onto the bolt protruding from the other opening. The two shaft elements 11 and 12 each include shaft receiving elements R11 and R12 on the coupling side with the housing washer 2. The shaft receiving portion elements R11 and R12 together form a shaft receiving portion R.

The two housing elements 21 and 22 together form a housing washer 2. The two housing elements 21 and 22 are provided with a housing connecting portion that connects them to each other in a detachable manner. For example, the housing washer 2 is formed on the contact surfaces of the two housing elements 21 and 22, and has concave and convex portions P21 and P22 that engage with each other. The two housing elements 21 and 22 are connected by engaging the uneven portions P21 and P22.

Additionally or alternatively, the two housing elements 21, 22 each have a through hole Q21, Q22 that extends through the two housing elements 21, 22, and a bolt and nut that pass through the through holes Q21, Q22. and is provided as a housing connection part. Then, the two housing elements 21, 22 are connected by inserting a bolt through one opening of the through holes Q21, Q22, and screwing a nut onto the bolt protruding from the other opening. The two housing elements 21 and 22 each include shaft elements S21 and S22 that engage with the shaft receiving portion R on the coupling side with the shaft washer 1. Shaft elements S21 and S22 form a shaft S together.

The two retainer elements 31, 32 together form a retainer 3 that holds multiple rolling elements (e.g., rollers or balls) B. The two retainer elements 31, 32 can be accommodated in the housing race 2 formed by the two housing elements 21, 22.

FIG. 3 is a perspective view showing a state in which the cage 3 is housed in the housing washer 2. As shown in FIG. As shown in FIG. 3, when the retainer 3 is housed in the housing washer 2, the retainer 3 is rotatable about the Z axis relative to the housing washer 2 due to the rotation of the plurality of rolling elements B. . Further, with the cage 3 housed in the housing washer 2, the shaft S of the housing washer 2 protrudes from the cage 3 in the Z-axis direction. The protruding portion of the shaft S of the housing washer 2 is rotatably engaged with the shaft receiving portion R (shown in FIG. 2(B)) of the shaft washer 1 when the shaft washer 1 is coupled to the housing washer 2. match.

Next, an example to which the bearing 10 is applied will be described.

FIG. 4 shows a gas insulated switchgear 50 to which the bearing 10 is applied. The gas insulated switchgear 50 includes flanges F, G and a connection tank 53 interposed between a pair of busbar tanks 51, 52 in which a main circuit busbar is built. The connection tank 53 is made of bellows and has a built-in connection busbar that connects the main circuit busbars.

As shown in Fig. 5, both ends of the connection tank 53 interposed between the bus tanks 51, 52 of the gas-insulated switchgear 50 (shown in Fig. 4) are fixed so as not to expand or contract by tightening nuts on flanges F, G through which stud bolts V are inserted. A pair of connection bus conductors 51C, 52C that constitute the connection bus are built into the connection tank 53, and a total of three pairs of connection bus conductors 51C, 52C for each phase are arranged in the depth direction of the paper.

The connection bus conductor 51C is fixed to the draw-out conductor 51B drawn from the main circuit bus of the bus tank 51 by tightening the fixing bolt 62. The connection bus conductor 52C is fixed to the draw-out conductor 52B drawn from the main circuit bus of the bus tank 52 by tightening the fixing bolt 63. The draw-out conductors 51B and 52B are supported by an insulating spacer 54 for gas separation.

Contacts 65 are provided on the inner diameter surfaces on both sides of the contactor 64 and are tightened by bellows joints H (shown in FIG. 6B, for example, ring springs) and are divided into a plurality of parts in the circumferential direction. A pair of connection bus conductors 51C and 52C are bridged via 65. Thereby, good electrical contact between the pair of connection bus conductors 51C and 52C is maintained.

Next, a description will be given of a bellows adjustment method performed by attaching the bearing 10 to a stud bolt V that passes through a flange F of the bellows and a nut. FIG. 6(A) is a front view showing the flange F of the gas insulated switchgear 50. FIG. 6(B) is a side view showing the flange F of the gas insulated switchgear 50.

As shown in FIG. 6(A), the flange F has eight stud bolts V (shown in FIGS. 6 to 8) screwed onto the outer circumference T with the flange axis as the center O. A through hole F1 is provided. In addition, in the flange F of FIG. 6(A), only the eight through holes F1 through which the stud bolts V are inserted are shown, and illustration of other components is omitted. For example, as another configuration, the flange F includes a plurality of through holes for fastening bolts for fastening the flange F and the end cover.

Next, an expansion method among the bellows adjustment methods performed by attaching the bearing 10 to a stud bolt V inserted between the flange F of the bellows and a nut will be explained using FIGS. 6 and 7. FIG. 7 is a schematic diagram showing the process of bellows expansion work in the installation work of the gas insulated switchgear 50. In addition, in FIG. 7, only the upper side of the flange F shown in FIG. 6(B) is shown.

As shown in FIG. 6(B), the flange F is inserted through eight stud bolts V (4 stud bolts x 2 in the depth direction of the paper), and has nuts on both sides (for example, inner and outer double nuts Ni, No. ) is fixed. In this state, the flange F is not subjected to any pressure in the left-right direction in the paper of FIG. 6(B).

When an operator attempts to expand the bellows by turning the double nut Ni from the state shown in FIG. 6(B), that is, to move the flange F outward (to the left in the paper plane of FIG. 6(B)), the flange F becomes the bellows. Since pressure is applied to the inside (to the right in the paper) by the joint H, it takes effort to turn the double nut Ni. Therefore, in order to assist the work of turning the double nut Ni, it is considered that a thrust bearing is installed in the gap between the flange F and the double nut Ni (the gap Ui shown in FIGS. 7(A) and 7(B)).

On the other hand, a double nut Ni and a flange F are respectively arranged on both sides of the gap in which the bearing 10 is to be mounted in the first stud bolt V1. Therefore, in the case of a normal thrust bearing, the double nut Ni cannot be removed from the stud bolt V, and the thrust bearing cannot be installed in the gap. This is because in a normal thrust bearing, the shaft washer, housing washer, and retainer are closed in the circumferential direction. However, with the bearing 10, each element before connection can be fitted into the corresponding gap of the stud bolt V and connected, and if the parts with connected elements are connected, it functions as a normal thrust bearing. You can also do it.

Therefore, for four stud bolts V (preferably four stud bolts V facing each other) out of the eight stud bolts V, the operator places the element before connection into the gap between the flange F and the double nut Ni. The bearings 10 are manufactured on the stud bolts V by fitting the parts into each part and joining the parts thus produced (see FIG. 7(E)). Hereinafter, the stud bolt V to which the bearing 10 is mounted is referred to as a first stud bolt V1, and the stud bolt V to which the bearing 10 is not mounted is referred to as a second stud bolt V2.

A method for manufacturing the bearing 10 on the first stud bolt V1 will be specifically explained using FIGS. 7(A) to (E). Note that FIGS. 7(B) to (D) show the area U shown in FIG. 7(A). The operator loosens the double nuts Ni and No that are in contact with both the inner and outer sides of the flange F from the state shown in FIG. 6(B) (see FIG. 7(A)). The operator fits the housing element 21 of the bearing 10 into the gap Ui of the first stud bolt V1, and also fits the housing element 22 of the bearing 10 into the gap Ui of the first stud bolt V1 (see FIG. 7(B)). . Then, the operator connects the housing element 21 and the housing element 22 to produce the housing washer 2 (see FIG. 7(C)). For example, the housing elements 21 and 22 are bolted together for connection.

Subsequently, the operator accommodates the retainer elements 31 and 32 of the bearing 10 in the housing washer 2 (see FIG. 7(C)). With the retainer elements 31 and 32 housed, the shaft S of the housing washer 2 projects to the left in the drawing. Note that the state in which the retainer elements 31 and 32 are accommodated in the housing washer 2 is as shown in FIG.

Subsequently, the operator fits the shaft elements 11 and 12 of the bearing 10 into the gaps Ui of the first stud bolts V1 (see FIG. 7(D)). Then, the operator connects the shaft element 11 and the shaft element 12 to produce the shaft washer 1. For example, bolts are tightened between the shaft elements 11 and 12 in order to connect them.

Next, the operator engages the shaft receiving part R of the connected shaft washer 1 with the shaft S of the connected housing washer 2, thereby connecting the shaft washer 1 and the housing washer 2. , are rotatably coupled via a retainer 3. In this way, the bearing 10 is manufactured on the stud bolt V (see bearing 10 shown in FIG. 7(E)). The external appearance of the bearing 10 after the parts are joined, that is, in a used state, is as shown in FIG.

As explained in FIGS. 7(B) to (E), between the double nut Ni on the first stud bolt V1 and the flange F, parts are created by connecting each divided element, and the parts are joined. By doing so, the bearing 10 in a used state can be manufactured. Note that the shaft washer 1 and the housing washer 2, which are parts, need only be engaged so that they can rotate relative to each other by the shaft receiving part R and the shaft S, and are free in the Z-axis direction. It can be attached and detached.

Next, the operator turns and tightens the compression nut Na of the inner double nut Ni inserted through the first stud bolt V1. That is, the flange F is moved away from the flange G, and the bellows is expanded to a predetermined length (see FIG. 7(F)). At this time, the housing washer 2 rotates relative to the shaft washer 1 in accordance with the rotation of the compression nut Na, while the shaft washer 1 suppresses the pressure received from the flange F in the right direction in the drawing. Therefore, in the work of expanding the bellows of the connection tank 53, the worker can turn the compression nut Na while being assisted by the bearing 10 after connection, and therefore can easily tighten the compression nut Na. can.

Next to FIG. 7(F), the operator tightens the double nut Ni inserted through the second stud bolt V2 to temporarily fix the flange F at the expanded position (see FIG. 7(G)). The operator loosens the compression nut Na of the double nut Ni inserted into the first stud bolt V1. Then, the operator disconnects the parts of the bearing 10 and disconnects the elements. Note that to release the combination of parts and the connection of elements, it is sufficient to release the combination of parts and release the connection of elements as explained in FIGS. 7(B) to (D). Subsequently, the bearing 10 whose components have been uncoupled and whose elements have been uncoupled is removed from the first stud bolt V1 (see FIG. 7(H)).

A double nut Ni and a flange F are arranged on both sides of the first stud bolt V1 at the position where the bearing 10 is mounted (see FIG. 7(G)). Therefore, in the case of a normal thrust bearing, the double nut Ni cannot be removed from the first stud bolt V1, and the thrust bearing cannot be removed. However, if the bearing 10 is used, the bearing 10 can be removed from the first stud bolt V1 after the parts are uncoupled and the elements are uncoupled.

Next to FIG. 7(H), the operator tightens the double nut Ni (Na and Nb) inserted into the first stud bolt V1 to fix the flange F in the expanded position (see FIG. 7(I)). ). That is, the bellows can be expanded by turning the double nut Ni and moving the flange F outward via the coupled bearing 10.

As explained in Figures 6 and 7, even if the stud bolt V between the flange F and the double nut Ni is closed during the bellows expansion work, the bearing 10 that functions in the same way as a normal thrust bearing can be attached to the stud bolt V, so the double nut Ni can be turned with a small force to move the flange F. Therefore, the workload of the worker who turns the double nut Ni during the bellows expansion work can be significantly reduced.

Next, the compression method among the bellows adjustment methods will be explained using FIGS. 6 and 8. FIG. 8 is a schematic diagram showing the process of compressing the bellows in the installation work of the gas insulated switchgear 50. In addition, in FIG. 8, only the upper side of the flange F shown in FIG. 6(B) is shown.

When the operator turns the double nut No. to compress the bellows from the state shown in FIG. 6(B), in other words, to move the flange F inward (rightward in the paper of FIG. 6(B)), the flange F becomes the bellows. Since pressure is applied to the outside (to the left in the paper) by the joint H, it takes a lot of effort to turn the double nut No. Therefore, in order to assist the work of turning the double nut No., it is considered that a thrust bearing is installed in the gap between the flange F and the double nut No. (the gap Wo shown in FIGS. 8A and 8B).

On the other hand, a double nut No. and a flange F are arranged on both sides of the gap of the first stud bolt V1 in which the bearing 10 is to be mounted. Therefore, in the case of a normal thrust bearing, the thrust bearing cannot be installed in the gap unless the double nut No. is removed from the first stud bolt V1. This is because in a normal thrust bearing, the shaft washer, housing washer, and retainer are closed in the circumferential direction. However, with the bearing 10, each element before connection can be fitted into the gap of the first stud bolt V1 and connected, and if the parts with connected elements are connected, it is possible to connect the elements before connection. It can also function as

Therefore, the worker manufactures each part of the first stud bolt V1 by fitting the element before connection into the gap between the flange F and the double nut No., connects the manufactured parts, and then creates the first stud bolt V1. A bearing 10 is manufactured on V1 (see FIG. 8(E)).

A method for manufacturing the bearing 10 on the first stud bolt V will be specifically explained using FIGS. 8(A) to 8(E). Note that FIGS. 8(B) to (D) show the area U shown in FIG. 8(A). The operator loosens the double nuts Ni and No that are in contact with both the inner and outer sides of the flange F from the state shown in FIG. 6(B) (see FIG. 8(A)). Then, the operator fits the housing element 21 of the bearing 10 into the gap Wo of the first stud bolt V1, and also fits the housing element 22 of the bearing 10 into the gap Wo of the first stud bolt V1 (FIG. 8(B)). reference). Then, the operator connects the housing element 21 and the housing element 22 to produce the housing washer 2 (see FIG. 8(C)). For example, the housing elements 21 and 22 are bolted together for connection.

Subsequently, the operator accommodates the retainer elements 31 and 32 of the bearing 10 in the housing washer 2 (see FIG. 8(C)). With the retainer elements 31 and 32 housed, the shaft S of the housing washer 2 projects to the right in the drawing. Note that the state in which the retainer elements 31 and 32 are housed in the housing washer 2 is as shown in FIG.

Subsequently, the operator fits the shaft elements 11 and 12 of the bearing 10 into the gap Wo of the first stud bolt V1 (see FIG. 8(D)). Then, the operator connects the shaft element 11 and the shaft element 12 to produce the shaft washer 1. For example, bolts are tightened between the shaft elements 11 and 12 in order to connect them.

Then, the worker engages the shaft receiving portion R of the connected shaft race 1 with the shaft S of the connected housing race 2, thereby connecting the shaft race 1 and the housing race 2 so that they can rotate via the retainer 3. In this way, the bearing 10 is made on the stud bolt V (see the bearing 10 shown in Figure 8 (E)). After the parts are connected, that is, the external shape of the bearing 10 in use is as shown in Figure 1.

As explained in Figures 8(B) to (E), each divided element is connected between the double nut No. on the first stud bolt V1 and the flange F to create parts, and the parts are then joined to create the bearing 10 in a usable state. The connection between the shaft washer 1 and the housing washer 2 components only needs to be such that they can rotate relatively by the shaft receiving portion R and the shaft S, and they can be freely detached in the Z-axis direction.

Subsequently, the operator turns and tightens the compression nut Na of the outer double nut No. inserted through the first stud bolt V1. That is, the flange F is moved toward the flange G, and the bellows is shortened to a predetermined length (see FIG. 8(F)). At this time, the housing washer 2 rotates relative to the shaft washer 1 in accordance with the rotation of the compression nut Na, while the shaft washer 1 suppresses the pressure received from the flange F in the left direction in the drawing. Therefore, in the work of compressing the bellows of the connection tank 53, the worker can turn the compression nut Na while being assisted by the bearing 10 after connection, so the worker can easily tighten the compression nut Na. can.

After FIG. 8(F), the worker tightens the double nut No inserted on the second stud bolt V2 to temporarily fix the flange F in the compressed position (see FIG. 8(G)). The worker loosens the compression nut Na of the double nut Ni inserted on the first stud bolt V1. The worker then releases the connection of the components of the bearing 10 and releases the connection of the elements. Note that the release of the connection of the components and the release of the connection of the elements can be achieved by releasing the connection of the components and the connection of the elements as described in FIG. 8(B) to (D). Next, the bearing 10 with the connection of the components and the connection of the elements released is removed from the first stud bolt V1 (see FIG. 8(H)).

A double nut No. and a flange F are arranged on both sides of the position on the first stud bolt V1 where the bearing 10 is attached (see FIG. 8(G)). For this reason, in the case of a normal thrust bearing, the thrust bearing cannot be removed unless the double nut No. is removed from the first stud bolt V1. However, in the case of the bearing 10, the bearing 10 can be removed from the first stud bolt V1 after the parts are uncoupled and the elements are disconnected.

Next to FIG. 8(H), the operator tightens the double nut No. inserted through the first stud bolt V1 to fix the flange F in the compressed position (see FIG. 8(I)). That is, the bellows can be compressed by turning the double nut No. and moving the flange F inward via the coupled bearing 10.

As described in FIG. 6 and FIG. 8, even if the stud bolt V between the flange F and the double nut No. is closed during the bellows compression work, the bearing 10, which functions in the same way as a normal thrust bearing, can be attached to the stud bolt V, so that the double nut No. can be turned with a small force to move the flange F. Therefore, the workload of the worker who turns the double nut No. during the bellows compression work can be significantly reduced. Also, when the stud bolt V between the flange F and the double nut No. is closed during the bellows compression work, the bearing 10 can be attached between the flange F and the double nut No. without removing the double nut No. from the stud bolt V. Therefore, the workload of the worker who removes the double nut No. during the bellows compression work can be significantly reduced.

According to at least one embodiment described above, when a force is applied in the axial direction of the nut to be rotated, it is possible to facilitate the operation of rotating the nut, especially the operation of compressing or expanding the bellows by the operator. . Therefore, the number of man-hours required for compressing and expanding the bellows can be reduced.

Although several embodiments have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, changes, and combinations of embodiments can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

1... Shaft washer 2... Housing washer 3... Retainer 10... Bolt thrust bearings 11, 12... Two shaft elements 21, 22... Two housing elements 31, 32... Two holding elements F, G...Flange P11, P12, P21, P22...Uneven part Q12, Q12, Q21, Q22...Through hole R...Shaft receiving part R11, R12...Shaft receiving part element S...Shaft S21, S22...Shaft element V...Stud bolt Ni …Inner double nut No.…Outer double nut

Claims (4)

A bellows, a pair of opposing flanges provided on both sides of the bellows, a plurality of stud bolts erected from one flange and penetrating the other flange, each of these plurality of stud bolts inside the other flange. and an inner nut and an outer nut provided on the outside to fix the position of the other flange with respect to each stud bolt, and compress/expand the bellows by moving the other flange with respect to each stud bolt. A bellows adjustment method,
providing a thrust bearing that can be connected and separated in the circumferential direction and has an annular shape when connected;
Selecting, from among the plurality of stud bolts, fewer stud bolts than the number of the plurality of stud bolts for compressing/expanding the bellows;
loosening an inner nut and an outer nut on the selected stud bolt and one of the inner nut or outer nut on the non-selected stud bolt in response to compression or expansion of the bellows;
In response to compression or expansion of the bellows, attaching the thrust bearing in an annular manner to a stud bolt between one of an inner nut or an outer nut of the selected stud bolt and a flange of the other;
The thrust bearing side nut of the selected stud bolt is tightened to move the other flange, and after the movement, the remaining inner nuts and outer nuts of the selected and non-selected stud bolts are tightened to move the other flange. a step of fixing the position of the
once loosening a nut on the thrust bearing side of the selected stud bolt, and separating the thrust bearing from the stud bolt;
a step of tightening the once loosened nut;
Including bellows adjustment method. The thrust bearing is
a shaft washer that is made up of a plurality of shaft elements that are separable in the circumferential direction and are connected to form an annular shape;
a housing washer formed of a plurality of circumferentially separable housing elements connected together to form an annular shape;
an annular retainer that holds rolling elements and is made up of a plurality of retainer elements that can be separated in the circumferential direction, is housed in the housing washer and is interposed between the shaft washer and the housing washer;
The bellows adjustment method according to claim 1, comprising: bellows and
A pair of opposing flanges provided on both sides of the bellows;
a plurality of stud bolts erected from one flange and passing through the other flange;
an inner nut and an outer nut that are provided on the inside and outside of the other flange in each of the plurality of stud bolts and fix the position of the other flange with respect to each stud bolt;
When compressing/expanding the bellows, stud bolts for compressing/expanding the bellows are selected from among the plurality of stud bolts and are smaller than the number of the plurality of stud bolts;
The inner nut or the outer nut of the selected compression or expansion stud bolt and the other are connectable and separable in the circumferential direction, are connected to form an annular shape, and depending on the compression or expansion operation of the bellows, the inner nut or the outer nut of the selected compression or expansion stud bolt. a thrust bearing that is attached to a stud bolt between the flange of the bellows to assist in tightening the inner nut or the outer nut, and that is separated and detached from the stud bolt after the bellows is compressed or expanded;
A bellows adjustment device comprising: The thrust bearing is
a shaft washer that is made up of a plurality of shaft elements that are separable in the circumferential direction and are connected to form an annular shape;
a housing washer which is made up of a plurality of circumferentially separable housing elements connected together to form an annular shape;
an annular retainer that holds rolling elements and is made up of a plurality of retainer elements that can be separated in the circumferential direction, is housed in the housing washer and is interposed between the shaft washer and the housing washer;
The bellows adjustment device according to claim 3, comprising:

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