JPH05336641A - Guide rail type expansion absorber - Google Patents

Abstract

PURPOSE:To prevent the occurrence of trouble by coupling a plurality of link mechanisms, and so constituting the circular guide rail of a mobile frame as to perform the action of dividing it equally each geometrically similar to a pantagraph mechanism. CONSTITUTION:An elastic absorber for accommodating a cable where a plurality of off set parts in succession are formed is constituted by continuously coupling a plurality of link mechanisms in each of which a coupling frame 19 and mobile frames 13, 14, and 15 are coupled by a coupling bar 21. The coupling frame 19 is so formed as to engage with a straight-line guide rail 20 for shifting it axially, and the mobile frames 13, 14, and 15 with circular guide rails 16, 17, and 18 axially and laterally. And, the circular guide rails 16, 17, and 18 of the mobile frames 13, 14, and 15 are so constituted as to perform the action of dividing it equally each geometrically similar to a pantagraph mechanism. Hereby, the occurrence percentage of trouble or inferiority can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion and contraction absorbing device for laying a power cable or a communication cable on a bridge with an offset.

[0002]

2. Description of the Related Art Generally, when an axial movement is applied to a cable, the cable has an offset shape shown in FIG. 6 to absorb the movement, and absorbs the movement due to a change in curvature with respect to the movement in the width direction. Is done. That is, when an offset having a radius of curvature R ₁ is made in advance between the left movable side and the right fixed side of the cable 1 and the movable side is moved in the axial direction to form the cable 2 shown by the broken line, the curvature is The amount of movement is absorbed by changing the radius R ₁ to the radius of curvature R ₂ .

However, if the amount of movement in the axial direction becomes large, the change in curvature of the cable 2 after movement will not be uniform, and local deformation of the cable is likely to occur. Therefore, a method is adopted in which the curvature of the deformed cable 2 becomes constant by the expansion / contraction absorbing device using the link mechanism shown in FIG. That is, the expansion and contraction absorbing device includes fixed frames X and Z provided on the movable side and the fixed side, and a link mechanism 3 at the center thereof.
And a moving frame Y joined by 3. And
The cable 1 is fixed by forming an offset by the fixed cable cleats 5 and 5 in the fixed frames X and Z and the fixed cable cleat 5 in the central moving frame C, and is movable in the middle of the link mechanisms 3 and 3. The cable 1 is held by the cable cleats 6 and 6. When the fixed frame X on the movable side moves in the axial direction, the expansion and contraction absorbing device changes to the expansion and contraction absorbing device 4 as shown by the broken line, and the cable 1 accommodated therein is transformed into the cable 2 and the curvature of the offset portion. Radius is R ₁
To R ₂ by a link mechanism.

On the other hand, as a countermeasure when the movement in the width direction is limited and a predetermined movement amount cannot be absorbed, by connecting a plurality of expansion / contraction absorbing devices,
A possible method is to divide the absorption amount per location into equal parts to suppress the movement amount in the width direction. FIG. 8 shows a mechanism diagram when a plurality of pantograph mechanisms are connected and each pantograph unit absorbs the movement amount evenly. That is, the pantograph 7 is configured by combining actuating rods A ₁ and A ₃ that are bendable around the pivot a and actuating rods A ₂ and A ₄ that are bendable along the pivot b. This parallel crank mechanism pantograph mechanism A,
Three B and C are connected from the movable side on the left side to the fixed side on the right side. Now, when the movable side P point moves to the P'point and changes to the pantograph mechanism 8 as shown by the broken line, the A point moves to A ', the B point moves to B', and the C point moves to C '. The cable offset is absorbed. FIG. 9 shows an example of the expansion and contraction absorbing device when the link mechanism shown in FIG. 7 is applied to the pantograph of FIG. By using a link mechanism instead of the operating rod of the pantograph, it has the same function as the pantograph. The cable 10 is housed and installed in the pantograph type expansion / contraction absorber 9 with three offsets from the movable side to the fixed side.

[0005]

By the way, as a drawback of the expansion and contraction absorbing device using the above pantograph mechanism,
The mechanism becomes bulky, the weight of the device increases, and as a result, the force for driving the device increases. As the number of link parts increases, the cause of device failure increases. When installing the expansion / contraction absorbing device 11 in the bridge as shown in FIG. 10, in the case where the partition (diaphragm) 12 and the like are provided on the way,
The parallel crank part may hit this partition and may not function. There is a problem such as ".

The present invention has been made in view of the above circumstances, and an object thereof is to solve the drawbacks of the prior art and to provide an improved cable expansion and contraction absorbing device in which a plurality of link mechanisms are connected. ..

[0007]

SUMMARY OF THE INVENTION According to the present invention, an expansion and contraction absorbing device for accommodating a cable having a plurality of continuous offset portions has a plurality of link mechanisms in which a connecting frame and a movable frame are connected by a connecting rod. The movable frame and the movable frame are connected to each other, and the connecting frame is formed so as to engage with a linear guide rail that moves in the axial direction and the arc-shaped guide rail that moves in the axial direction and the width direction. A guide rail type expansion-contraction absorbing device, characterized in that the guide rail is configured to perform an operation of geometrically equally dividing it into a pantograph mechanism. Further, the movable frame of the expansion / contraction absorbing device is a guide rail type expanding / contracting absorbing device constructed by pivotally connecting guide shoes with a bush so that the movable frame can be easily moved along the arc-shaped guide rail.

[0008]

With the simplified structure of the guide rail type expansion and contraction absorbing device, the moving force accompanying the expansion and contraction absorption can be reduced, and a highly reliable device that does not cause a failure can be obtained. In particular, the movable frame that moves in the axial direction and the width direction can absorb the amount of movement that is evenly divided, and since the guide shoe of the movable frame is configured to be pivotally connected by a bush, There is no friction between the two and very smooth movement can be performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle of the present invention will be described below with reference to the drawings. In this example, it is an equal division expansion / contraction device when three link mechanisms are connected. FIG. 11 shows the mechanism of the even division telescopic device, which shows the state before and after the movement. That is,
As a member that evenly deforms the three link mechanisms from the movable side on the left side to the fixed side on the right side, three movable frames 13 in the middle,
Guide rails 16, 17 and 18 that allow 14 and 15 to draw a prescribed arc locus and a linear rail 20 that restricts the four connecting frames 19 only in the axial direction are required. Movable frame 1
Guide rails 16, 17, 18 for 3, 14, 15
In the pantograph mechanism shown in FIG. 8, the shapes of the vertices are vertices A, B and C when the movable side point P is moved only in the x direction.
It may be the same as the loci A to A ', BB to C', and C to C '. The loci of the vertices A, B, and C are geometrically determined by the following equations, where x is the amount of movement in the x direction, y is the amount of movement in the y direction, and R is the length of the connecting rod that constitutes the link mechanism 3. ..

Trajectories A to A'of vertex A: (x / 5) ² + y
² = R ² (guide rail 16)

Trajectory B to B'of vertex B: (x / 3) ² + y
² = R ² (guide rail 17)

Locus C to C'of vertex C: x ² + y
² = R ² (guide rail 18)

When a moving amount of 6 m is applied to the left connecting frame 19 in FIG. 11 in the axial direction, each link mechanism absorbs 2 m evenly, and if the length of the member 21 of the link portion is made constant. The amount of movement in the width direction is also uniform. Moreover, by changing the loci / dimensions of the arcuate gadrails 16, 17, and 18, it is possible to share the absorption of an arbitrary amount of expansion / contraction with each continuous expansion / contraction device.

Next, a specific embodiment of the present invention will be described. 1 is a plan view of the expansion and contraction absorbing device, FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1, FIG. 3 is a sectional view taken along the line BB ′ of FIG. 1, and FIG. 4 is a side view showing the structure of a linear rail portion. 5 is a side view showing the guide rail portion. That is, in the expansion-contraction absorbing device, the four connecting frames 19 are arranged at equal intervals from the left movable side, and these spaces are connected by the link members 21 of the same length via the three movable frames 13, 14, 15. Is configured.

As shown in FIG. 2, the connecting frame 19 has a rectangular box-like casing formed of upper and lower guide shoe fixing members 23a, left and right vertical frame members 31 and members 21 in the longitudinal direction. The vertical frame member 31 and the longitudinal member 21 of the fixing member 23a are fixed by a gusset plate 33. In the housing, three-phase power cables 10 are stacked in a bale, and two water cooling tubes are fixed and housed on both sides thereof by fixed cable cleats 5. Sliding members 24 are provided on both sides below the lower guide shoe fixing member 23a, and are formed so as to be engaged with the linear rails 20 and movable in the axial direction.

FIG. 4 is an enlarged view of the structure of the linear rail portion. A concave guide shoe 25 is attached to the lower side of the guide shoe fixing member 23a, and three sliding members 24 are inserted and fixed in the concave portion so as to reduce friction. Therefore, when the guide shoe 25 is engaged and moved across the linear rail 20, the connecting frame 19 has no friction and can move lightly and smoothly in the axial direction.

As shown in FIG. 3, the movable frames 13, 14 and 15 are rectangular parallelepipeds each composed of an upper and lower guide shoe fixing member 23b and a longitudinal member 21 fixed to left and right vertical frame members 32 by gusset plates 33. Form the housing of 3
The phase power cables are stacked in a bag, and two water cooling tubes are fixedly housed on both sides of the power cables by fixed cable cleats 5, respectively. The guide shoe fixing member 23b and the left and right longitudinal members 21 are pivotally connected by hinges 22, respectively. Below the lower guide shoe fixing member 23b, load rails 32 are provided on both sides to support the weights of the movable frames 13, 14, 15 respectively. A guide shoe 25 is provided at the center of the movable frame 13, 14 and 15 so that the movable frames 13, 14 and 15 move along an arc locus by engaging the arc-shaped guide rails 16, 17 and 18, respectively. ..

FIG. 5 is an enlarged view of the structure of the guide rail portion. In the guide rail portion, a bush 30 is vertically inserted into a lower guide shoe fixing member 23b by a guide pin 27, and a guide washer 25 is rotatably fixed by a nut 28. Further, the guide shoe 25 is similar to the linear rail 20 shown in FIG.
6, 17 and 18 are engaged, but the guide shoe 2
5 and the guide rails 16, 17 and 18 also have sliding members 2
4 is provided. Therefore, the arc-shaped guide rails 16,
The movable frames 13, 14 and 15 can move smoothly along the lines 17 and 18 by reducing the friction of the rotating portion.

In this example, the case where three link mechanisms are connected has been described, but it is needless to say that this can be applied to the expansion and contraction absorbing device in which a plurality of (two or more) link mechanisms are connected.

[0020]

As described above, according to the guide rail type expansion / contraction device of the present invention, since the structure is simple, the occurrence rate of failures and defects can be suppressed, and the guide rail type is highly reliable. It becomes a stretchable absorber. Further, as compared to the pantograph type, the number of members is reduced, so that the load applied to each member can be reduced and the cost can be reduced. Further, a larger space can be taken when laying the cable, which improves workability. Further, since the pantograph mechanism is not required, it can be applied even if the bridge has partitions.

[Brief description of drawings]

FIG. 1 is a plan view showing the entire guide rail type expansion-contraction absorbing device of an embodiment of the present invention,

FIG. 2 is a front view of the fixing frame taken along the line AA ′ of FIG.

FIG. 3 is a front view of a movable frame taken along the line BB ′ of FIG.

FIG. 4 is an enlarged front view showing the linear rail portion of FIG. 2;

FIG. 5 is an enlarged front view of the guide rail portion of FIG.

FIG. 6 is an explanatory diagram for explaining a cable offset,

FIG. 7 is an explanatory view of a telescopic device for absorbing offset,

FIG. 8 is an explanatory view of a pantograph type expansion / contraction device for absorbing offset,

FIG. 9 is an explanatory view of a telescopic device using a link mechanism,

FIG. 10 is a perspective view when the expansion and contraction absorbing device is installed on the bridge,

FIG. 11 is an overall configuration diagram for explaining states before and after movement of the present invention.

[Explanation of symbols]

 10 cables 13, 14, 15 movable frame 16, 17, 18 arcuate guide rail 19 connecting frame 20 straight guide rail 21 connecting rod (link member) 25 guide shoe 30 bush

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Kurata 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo “Inside Tokyo Electric Power Company” (72) Inventor Hironori Tomita 5-chome, Hidaka-cho, Hitachi, Ibaraki No. 1 "Hitachi Cable Co., Ltd. Hidaka Factory"

Claims (2)

[Claims] 1. An expansion / contraction absorbing device for accommodating a cable having a plurality of continuous offset portions is constituted by continuously connecting a plurality of link mechanisms in which a connecting frame and a movable frame are connected by a connecting rod. The frame is formed so as to engage with a linear guide rail that moves in the axial direction and the movable frame that engages with an arcuate guide rail that moves in the axial direction and the width direction. A guide rail type expansion-contraction absorbing device, characterized in that it is configured to perform the same uniform division operation as the pantograph mechanism. 2. The movable frame of the expansion-contraction absorbing device is configured by pivotally coupling a guide shoe with a bush so that the movable frame can be easily moved along an arc-shaped guide rail.
Guide rail type expansion and contraction absorber described.