JPH1141777A - Cable protective apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cable protective apparatus which can prevent the generation of an accident caused by the damage of a cable, by installing the cable which is set to an extended or bent state according to the extension or the contraction of the length of an outer tube and an inner tube which are changed telescopically. SOLUTION: A cable 7 is formed in such a way that respective bends having a nearly equal amount are formed between a plurality of suspension metal fittings 4 arranged and installed in the axial direction at the inside of an outer tube 1 and an inner tube 2. The suspension metal fittings 4 are suspended, they are set to an extended or bent state according to the expansion or the contraction of the length of the outer tube 1 and the inner tube 2 which are changed telescopically, and they freely follow the extension or the contraction. The cable 7 is delivered from a vibration base 8 to the suspension metal fittings 4 installed at the inside of the inner tube 2, and it is fixed by a cable fixation implement 5B which is installed in the upper part of a bracket fixed to the inner tube 2. Alternatively, the cable 7 is delivered from a fixation part 9 to the suspension metal fittings 7 installed at the inside of the outer tube 1, and it is fixed by a cable fixation implement 5A which is installed in the upper part of a bracket fixed to the outer tube 1. As a result, the cable 7 is not moved, and it is possible to prevent the generation of an accident caused by the damage of the cable 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable provided on a movable portion, for example, a movable portion of a stage device, a robot arm, or the like, which is provided in a movable portion having a variable interval between mounting positions. The present invention relates to a cable protection device that prevents damage due to occurrence of vibration, and in particular, through a vibration device or a vibration table (hereinafter referred to as a vibration table) having a large vibration amplitude, and a vibration table and a vibration exciter. The present invention relates to a cable protection device suitable for preventing a cable installed between a connected base portion and a fixed portion (hereinafter, referred to as a fixed portion) from being damaged by a load when the shaking table is operated.

[0002]

2. Description of the Related Art In order to transmit a detection signal detected by a measurement sensor installed on a shaking table to a fixed portion or to supply power for operating the measuring sensor, the signal is installed between the shaking table and the fixed portion. As shown in FIG. 8, the conventional cable is constructed between a vibrating table 08 and a fixed part 09 connected to the vibrating table 08 via a vibrator 01. In addition, the cable 07 to be erected is routed in an exposed state without protection, particularly in a wrapped state.

[0003] The vibration range of the shaking table 08 is ±
In the case of operating in a relatively small range of about 0.3 m or less, such a plurality of cables 07 are united together and routed naked without being wrapped, and the installation procedure shown in the figure. Even if it is installed at a location, no major failure occurs. However, when the shaking table 08 operates in a large vibration range of ± 1 m, in a device in which each cable 07 is routed naked, the cable 07 swings around, and the cable 07 is swung. Not only does it cause damage and hinders the acquisition of vibration data,
It may cause an accident.

That is, such a cable 07 has
In addition to transmitting the vibration measurement data generated in the test piece installed on the shaking table 08 to the fixed part 09, the vibration generated in the control cable of the vibrator 01 and the test piece on the shaking table 08 is measured. However, since the cables necessary for controlling the operation of the vibrator 01 are also included in accordance with the measured vibration situation, if damage is caused, the cables are transmitted based on the signals transmitted through these cables. This is because it may be difficult to control the exciter 01 or the like to be controlled.

In a conventional vibration test using a shaking table 08, the size of the test sample is small, the number of points for measuring the vibration phenomenon is small, and the amplitude of the shaking table is small as described above. The cable installed between the shaking table 08 and the fixed part 09 is a multi-core cable or a single cable obtained by combining a plurality of single-core wires. In some cases, it is suspended by the space between the fixed part 09 and the vibrating table 08 with the length corresponding to the amplitude corresponding to the amplitude of 08.

However, in recent years, the number of measurement points has been increased by 10 to 15 times (2000 to 3000 points), and the vibration amplitude is close to 5 times, that is, a large vibration range of ± 1 m as described above. Vibration experiments with a very large three-dimensional shaking table are being performed.

For this reason, in addition to the control cable provided for controlling the operation of the vibrator 01, the power supply for operating the measurement sensor and the transmission of the detection signal of the measurement sensor are carried out by cables as in the conventional case. If it does, 2000 to 3000 3- to 4-core cables are required. For this reason, even if the most multi-core cable currently on the market is adopted, about 20 to 30 cables 06 are required, and enormous time and cost are required for connecting and laying these cables 06, and the cable 06 is required. Are also increasing in weight per unit length.

Further, the danger of occurrence of crosstalk in the detection signal of the measurement sensor between the core wires has been increasing. Furthermore, since the vibration amplitude increases, the length of the cable 06 suspended between the vibration table 08 and the fixed portion 09 increases,
As a result, the weight of the cable 06 is further increased.

From the above, as shown in FIG.
In the cable 07, which is suspended between the shaking table 08 and the fixing part 09, a large tension and bending force acts on the vicinity of the mounting part 05 for fixing both ends of the cable 06, and the cable 06 There is also a problem that damage such as breakage of the core wire is likely to occur, and this is further accelerated by vibration, thereby impairing measurement reliability. Further, once damage such as disconnection of the 06-core cable occurs, there is a problem that the recovery work requires enormous time and cost.

In FIG. 9, 02 is a cylinder,
Reference numeral 03 denotes a piston rod, and reference numeral 04 denotes a discharge port that discharges and discharges hydraulic oil into the cylinder 02 in accordance with the frequency and amplitude at which the hydraulic oil is generated on the vibration table 08 to operate the piston rod 03. Also, a vibrator 01 for vibrating the vibrating table 08 is configured.

Reference numeral 010 denotes a connecting device for connecting one end of the cylinder 02 to the fixed portion 09, and reference numeral 011 denotes a connecting device for connecting one end of the piston rod 03 to the vibration table 08.

[0012]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cable which is mounted on a movable part which operates, for example, when the distance between respective mounting parts fluctuates, such as between the vibration table and the fixed part. Therefore, even when the distance of the mounting portion fluctuates within a large range, and even when the weight of the cable increases, it is possible to completely prevent the occurrence of damage accompanying the operation of the movable portion. Cable protection that can suppress the occurrence of accidents due to cable damage, decrease in the availability of measurement data or decrease in reliability of measurement data, and increase in time and cost required for recovery work required due to cable damage It is an object to provide a device.

[0013]

For this reason, the first cable protection device of the present invention is as follows.

(1) An outer cylinder, an inner cylinder that slides and expands and contracts inside the outer cylinder, and an inner cylinder that is inserted through the outer cylinder and the inner cylinder, respectively.
An outer cylinder which fluctuates in a telescopic manner due to sliding of the inner cylinder and a cable which is extended or bent in accordance with the expansion and contraction of the length of the inner cylinder are provided. In addition, the cable which expands or bends in response to the fluctuation of the length of the outer cylinder and the inner cylinder which fluctuates due to the sliding of the inner cylinder is not a stretch or shrinkage that occurs in the material itself of the cable, but a spiral or the like. It refers to elongation or bending caused by shape deformation of a cable formed into a shape.

It is preferable that the extension or bending of the cable is made to be in an extended or bent state by the shape deformation of the cable which is reversibly deformed. Further, in order to slide the inner cylinder inside the outer cylinder, a minute gap is provided between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder, and a sliding member such as a bearing is provided in the gap. It is preferable to do so.

(A) In the cable protection device according to the present invention, the cables to be mounted are respectively mounted by the means (1) as in the case between the fixed table and the vibration table, and the distance between the fixed mounting sections is fixed. The cable erected on the movable part that is made to fluctuate is inserted through the inside of the outer cylinder and the inner cylinder whose length is changed in accordance with the change in the interval, The length, in other words, the length corresponding to the variation of the interval of the mounting portion, freely expands or bends, so that it does not become a bare state exposed to the outside, and the variable interval is ±
Even in the case where it is installed between the fixed table and the vibrating table that reaches as much as 1 m, or when the weight per unit length increases due to the increase in the number of measurement points, the cable does not swing around, and the surrounding members and In addition to eliminating the occurrence of load on the cable that occurs at the time of collision or whirling of the cable, the occurrence of load due to the expansion and contraction of the cable itself due to the change in the interval or the increase in its own weight is eliminated, and damage is not generated.

Thus, it is possible to prevent the occurrence of an accident due to the damage of the cable, to reliably obtain the measurement data, and to improve the reliability of the obtained measurement data. In addition, since damage can be prevented, recovery work and the like become unnecessary, and cost can be reduced and efficiency of a vibration test and the like can be improved.

The second cable protection device of the present invention employs the following means in addition to the above-mentioned means (1).

(2) A suspending device for suspending a cable inserted through the inside of the cylindrical body whose length fluctuates as the inner cylinder slides inside the outer cylinder is provided inside the outer cylinder and the inner cylinder. A plurality of cables are provided to hold the cables.

The hanging member is not fixed to the cable. For example, a spirally shaped cable is loosely inserted into a ring or the like that allows relative movement between the cable and the hanging member. It is preferable to adopt a cable in which the cable is held inside the outer cylinder and the inner cylinder by a ring or the like. That is, it is preferable that the extension or bending of the cable be caused by the shape deformation of the cable and also be caused by the relative movement between the cable and the suspender.

(B) In the cable protection device of the present invention, in addition to the above (a), the cable protection device according to the above-mentioned (2), in addition to the above-mentioned (a), has a cable inside the outer cylinder and the inner cylinder which accompanies the fluctuation of the interval generated in the movable part. Since the expansion or bending of the cable becomes more gradual, and the expansion or bending operation of the cable can be generated in synchronization with the change in the interval,
The expansion and contraction of the cable itself due to the fluctuation of the interval or the cable's own weight can be made smaller, the load generated on the cable can be further reduced, and the occurrence of damage can be reduced.

Further, since the cable is guided or guided by the hanging member and extends or bends inside the outer tube and the inner tube, the movement inside the outer tube and the inner tube at the time of expansion or bending becomes smoother, The occurrence of a cable load caused by the operation of elongation or bending inside the cylinder can be further reduced, and the occurrence of damage can be further reduced.

A third cable protection device according to the present invention includes the following means in addition to the above-mentioned means (1) or the above-mentioned means (1) and (2).

(3) One end of the outer cylinder is moved relative to the fixed portion by a fixed portion fixed to the ground or a vibrator having one end connected to the fixed portion to generate vibration. One end of the inner cylinder that is connected to one of the shaking tables and slides inside the outer cylinder is connected to one of the shaking tables that are not connected to the one end of the outer cylinder, or one of the fixed portions, and The connection between the cylindrical body and the vibration table or the fixed portion is made by a rotatable connection mechanism.

It is assumed that one end of the outer cylinder and the inner cylinder on which the coupling mechanism is provided are provided on the side opposite to the side on which they slide. In addition, the connection mechanism is configured so that the connection can move relatively vertically, horizontally, and back and forth, so that the connection is freely movable in the so-called circumferential direction. Preferably, the axial directions of the outer cylinder and the inner cylinder can be changed in the vibration direction. Also,
The cables inserted into the outer cylinder and the inner cylinder are provided with cable fixing members at the ends of the outer cylinder and the inner cylinder in the vicinity of the coupling mechanism, respectively. It is preferable to connect to each other.

(C) The cable protection device of the present invention uses the above (a) or (a),
In addition to (b), with the operation of the shaking table, the connecting mechanism freely moves in the entire circumferential direction, and the axial directions of the outer cylinder and the inner cylinder follow the vibration direction accordingly. Thus, the outer tube, the cable inserted into the inner tube, the inner tube, according to the movement of the outer tube, or, according to the movement of the plurality of hanging members installed inside the inner tube, the outer tube, It can freely follow the direction of vibration generated in the shaking table. Therefore, even if vibrations are generated in any direction on the shaking table, or even when vibrations having a somewhat large amplitude are generated, no load is applied to the cable, and no damage occurs. A highly reliable vibration device can be obtained.

The fourth cable protection device of the present invention employs the following means. (4) Spiral ridges and valleys are provided, respectively, and are provided on at least one of the ridges and valleys of the flexible member which can be expanded and contracted and bent. Cable. In addition, it is preferable that the pitch provided in the flexible member is set in accordance with the size of expansion and contraction required for the flexible member, that is, the amount of fluctuation of the movable portion.

(D) In the cable protection device according to the present invention, by means of the above (4), the interval between the mounting portions to which the respective cables to be mounted are mounted fluctuates as between the fixed portion and the vibration table. The cable erected on the movable part expands and contracts in response to a change in the interval, and is provided on one or both of the ridges and valleys of a flexible member made into a bellows shape or the like that excels in expansion and contraction responsiveness and flexibility. It is arranged so that it expands and contracts at the same time as expansion and contraction of the flexible member, and furthermore, there is no relative movement with the flexible member so that it is held by the flexible member. When the cable is installed on a movable part such as between a fixed table and a vibrating table, or when the weight per unit length becomes large, local bending and tensile force of the cable may occur. Less load on the cable It can be, it is not necessary to damage.

As a result, an optical fiber cable or the like which has a large amount of information such as measurement data but is weak against mechanical external forces such as bending and tension can be used as the cable. Further, since the cable is held by the flexible member, the cable does not swing around, and damage that may be caused by the swinging can be prevented.

As a result, similarly to the means (1), occurrence of an accident due to damage to the cable, inability to acquire measured data, and reduction in reliability of measured data due to cross leak between cables are eliminated. Furthermore, by using an optical fiber cable or the like as the cable, the transmission amount of measurement data per cable can be increased, and even when the number of measurement points and the like increases, the number of cables can be reduced. In combination with the reduction in the diameter of the cable, the cable weight per unit length can be reduced. Further, it is possible to prevent the cost associated with the restoration of damage and the prolongation of the test time.

The fifth cable protection device of the present invention employs the following means in addition to the above means (4).

(5) One end of a flexible member having a cable disposed at one or both of the peaks and valleys is connected to a fixed portion erected on the ground, and the other end is connected to the fixed portion. It is connected to a shaking table that moves relatively. In addition, the end of the flexible member connected to the fixed portion or the vibration table adopts a rotatable connection mechanism so that it can cope with the case where multi-directional vibration is generated in the vibration table. In addition, it is preferable to reduce the gap between the connecting mechanism and the flexible member so as to suppress the vibration generated in the flexible member itself.

(E) In addition to the above (d), the cable protection device of the present invention, by means of the above (4), faithfully follows the movement of the flexible member which expands and contracts following the vibration generated in the vibrating table. The cable also expands and contracts, so even if it is installed between a shaking table that generates vibration with a certain amplitude and the fixed part, the cable will not be loaded, preventing damage. it can.

Thus, it is possible to provide a highly reliable shaking table which does not cause any trouble in obtaining measurement data and can obtain reliable measurement data. In addition, by adopting a rotatable connection mechanism and reducing the gap of the connection mechanism, the vibration amplitude of the flexible member, in other words, the vibration amplitude of the cable can be made as small as the gap. The external force due to the acting vibration can be further reduced.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cable protection device according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing a first embodiment of a cable protection device according to the present invention in a partial cross-sectional view, FIG. 2 is a detailed view of a portion A shown in FIG. 1, and FIG. FIG. 2B is a sectional view taken along the line AA of FIG. 2A, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 4 is a detailed view of a portion C shown in FIG. It is.

As shown in FIG. 1, an outer cylinder 1 and an inner cylinder 2
The cable 7 accommodated in the inside of the outer tube 1 and the inner tube 2 is interposed between the plurality of hanging members 4 arranged in the axial direction.
The outer cylinder 1 and the inner cylinder 2 which are formed in a shape having a substantially equal amount of flexure, are suspended by the suspender 4, and fluctuate in a telescopic shape due to sliding of the outer cylinder 1 and the inner cylinder 2 back and forth. The shape changes according to the expansion and contraction of the length, and the state changes to an expanded or bent state, so that the length can be freely followed.

The outer cylinder 1 and the inner cylinder 2 are slid by a sliding portion 3
As shown in FIG. 4, a gap is provided, and a sliding member 12 such as a ball bearing is interposed in this gap, so that there is almost no sliding resistance and the structure expands and contracts smoothly.
Also, in order to insert the cable 7 for inserting the inside,
As shown in FIG. 3, each of the two-part structure is formed, and a flange 10 provided at a joint portion of the two-part structure is fixed with a bolt and a nut 11 so as to be formed in a cylindrical shape.

The cable 7 inside the outer cylinder 1 and the inner cylinder 2
As shown in FIG.
Adopt a ring formed at one end,
In response to the expansion and contraction of the lengths of the outer cylinder 1 and the inner cylinder 2, the cable 7 has almost no resistance, and the amount of bending provided between the rings is changed, so that the amount of bending changes to an extended or bent state. And expand and contract freely.

Although not shown in these figures, the vibrating table 8 which is movable with respect to a fixed portion 9 fixed to the ground by a vibrator or the like, is vertically, horizontally and vertically, so-called in all directions. In order to cope with the vibration of the outer cylinder 1 and the inner cylinder 2, a connecting mechanism 6 A for connecting the outer cylinder 1 and the fixed part 9, Shaking table 8
And a connecting mechanism 6B for connecting.
As shown in FIG. 2, these connecting mechanisms 6 are provided between the bracket fixed to the outer cylinder 1 and the bracket fixed to the fixing portion 9, and the bracket fixed to the inner cylinder 2 and the vibration table 8. Between the fixed bracket, up and down, respectively
It can be moved in all directions around the left, right, front and back,
A spherical joint is employed.

Although the cable 7 is pulled in the front-rear direction even when the connecting mechanism 6 moves in the entire circumferential direction,
In a manner similar to the above-described variation in the length of the outer cylinder 1 and the inner cylinder 2, the cable 7 can be freely followed by being deformed in a stretched or bent state. Also,
The cable 7 is passed from the vibrating table 8 to the hanging member 4 provided inside the inner cylinder 2 by the cable fixing tool 5B provided above the bracket fixed to the inner cylinder 2 described above.
The cable 7 is passed from the fixing portion 9 to the hanging member 4 provided inside the outer cylinder 1 with the cable fixing tool 5A provided above the bracket fixed to the outer cylinder 1 so as to be fixed respectively. In these fixtures 5 part,
The cable 7 does not move.

The cable protection device according to the present embodiment has the above-described configuration, and the movable parts whose intervals vary, such as between the fixed part 9 and the vibrating table 8, are provided with cable fixtures 5A, 5B at both ends.
The cables 7 attached to and mounted on the inner tube 2 are inserted through the inside of the outer tube 1 and the inner tube 2 whose lengths are changed in accordance with the change in the interval generated in the movable portion. Correspondingly, the amount of bending provided between the hanging members 4 is varied so that the length is extended or bent, and the inside of the outer tube 1 and the inner tube 2 is supported by the hanging members 4. Therefore, even when the distance between the fixed portion 9 and the vibrating table 8 is as large as ± 1 m, or when the weight per unit length is large, the cable 7 does not swing,
Can be reduced, and the elongation or flexure of the cable 7 in accordance with the change in the interval can be prevented from being damaged.

Thus, it is possible to prevent the occurrence of an accident due to the damage of the cable 7, to reliably obtain the measurement data of the specimen transmitted by the cable 7, and to improve the reliability of the obtained measurement data. Can be done. In addition, since the cable 7 can be prevented from being damaged, recovery work and the like become unnecessary, and costs can be reduced, the efficiency of a vibration test and the like can be increased, and the vibration device can be used effectively.

Further, since the connection between the outer cylinder 1 and the fixed portion 9 and the connection between the inner cylinder 2 and the vibrating table 8 are formed by the connection mechanism 6 using a spherical joint capable of coping with the movement in all circumferential directions, the cable 7 Follows the direction of vibration generated in the entire circumferential direction of the vibration table 8 and changes its direction in the vibration direction in accordance with the movement of the outer cylinder 1 and the inner cylinder 2 that change the axial direction. Thus, even if vibrations are generated in the vibration device 8 in any direction, a load is not applied to the cable 7 and no damage occurs, and a reliable vibration test is performed. Will be able to

Next, FIG. 5 is an overall sectional view showing a second embodiment of the cable protection device of the present invention, and FIG. 6 is a detailed view of a portion D in FIG.

As shown in the figure, in the present embodiment, a vibrator 01 similar to that shown in FIG. 9 for vibrating the vibrating table 8 is formed. The first bellows 15 is provided. This first
As shown in FIG. 6, a bellows 15 is provided with a peak portion 16 and a valley portion 17 formed in a spiral shape, and one end is fixed to a rotating ring 18 rotatably mounted on the outer periphery of a piston rod 03, The other end is firmly fixed to the end of the cylinder 03 constituting the vibrator 13 and is disposed so as to cover the outer periphery of the piston rod 03.

An optical fiber cable 20 as a cable is wound and fixed on the peak 16 of the first bellows 15, and a power supply cable 21 is also wound on the valley 17. , To be fixed.
In the present embodiment, the actuators for the vibration measurement sensor, that is, the power supply, the signal processor, the amplifier, and the like are all mounted on the vibrating table 08. The sensor output signal output from the vibration detector installed on the vibration table 8 is converted from an electric signal into an optical signal and transmitted in a time series by a switch. One optical fiber cable 20 is used.

Further, between the inner periphery of the valley 17 of the first bellows 15 and the outer periphery of the piston rod 03, the first bellows 1
5 is provided with a minimum gap 8 that can smoothly expand and contract. As a result, the first bellows 15 expands and contracts smoothly according to the expansion and contraction of the piston rod 03 when the vibrator 01 is operated, and the gap 8 is set to the minimum necessary. The optical fiber cable 20 and the power supply cable 21, which are wound around and fixed to the peaks 16 and the valleys 17 of the first bellows 15, respectively, receive a local external force due to the expansion and contraction of the piston rod 03. Will not start.

Further, a second bellows 14 is provided around the connecting device 011 using the spherical joint provided on the vibration table 08 side, and between the vibration table 08 and the piston rod 03 in the connecting device 011. It is designed to deal with the directional fluctuations that occur. That is, one end is firmly fixed to the side end of the vibrating table 08, and the other end is firmly fixed to the end of the rotating ring 18 described above. At the time of a direction change occurring between the piston rod 03 and the piston rod 03, a second bellows 14 having a minimum gap required to prevent contact is provided, and like the first bellows 15,
The optical fiber cable 20 is wound and fixed on the peak 16, and the power supply cable 21 is wound and fixed on the valley 17.

The rotating ring 1 is rotatably mounted on the outer periphery of the piston rod 03, and one end of the first bellows 15 and the other end of the second bellows 14 are firmly fixed.
8 facilitates the connection between the first bellows 15 and the second bellows 14 and twists the first bellows 15 and the second bellows 14 by the rotation of the cylinder 02 in the axial direction. An extra external force is prevented from acting on the wound optical fiber cable 20 and the power supply cable 21.

Further, a third bellows 13 having the same configuration as the second bellows 14 is also provided around the connecting device 011 using the spherical joint provided on the fixed portion 09 side, and the second bellows 13 is provided. The same operation as 14 is performed.

As described above, in the cable protection device of the present embodiment, the power supply cable 21 is connected to the power supply connector 22 provided on the fixed portion 09 by the valley portion 1 of the third bellows 13.
7 and passed to the power supply connector 22 installed in the cylinder 03, and further, the valley 17 of the first bellows 15, the power supply connector 22 on the rotating ring 18, and the second bellows 14 And a single cable that is passed to the power supply connector 22 installed on the vibrating table 08 through the valley portion.

The optical fiber cable 20 is connected to the second bellows 1 from the optical fiber connector 23 provided on the vibration table 8.
4, is wound around and fixed to the crest 16, passed over the optical fiber connector 23 on the rotating ring 18, and further passed through the first bellows 15.
1 is passed to the optical fiber connector 23 installed on the fixed part 9 via the optical fiber connector 23 installed on the cylinder 03 and the optical fiber connector 23 installed on the cylinder 03.
They are all bundled in a book cable.

As a result, the number of cables is remarkably reduced, and the piston rod 03 for operating the cable, the first bellows 15 as a flexible member provided so as to enclose the outer periphery of each of the coupling devices 010 and 011, and Since the third bellows 13 and the second bellows 14 are wound and fixed on the peaks 16 and the valleys 17 of the second bellows 14, vibrations caused by rapid expansion and contraction of the piston rod 03 and bending of the coupling devices 010 and 011 are suppressed. Spiral, first, second, third
Due to the expansion and contraction responsiveness and the bending responsiveness of the bellows 15, 14, and 13, the local bending force and the tensile force are less likely to act on the optical fiber cable 20 and the power supply cable 21, so that damage can be suppressed.

In particular, an optical fiber cable 20 that is weak against mechanical external forces such as bending and tension but can increase the amount of information transmission.
Is provided on the ridge portion 16, so that damage can be further reduced. In addition, by combining the cables into a single cable, particularly by transmitting the sensor output signal by the optical fiber cable 20, the number of core wires can be dramatically reduced, and the material can be reduced in specific gravity. Is reduced, the weight per unit length is also reduced, the inertial force acting on the optical fiber cable 20 can be reduced, and the damage can be suppressed despite being weak against mechanical external force. .

In the present embodiment, the gap 8 between the inner periphery of the first to third bellows 15, 14, and 13 and the outer periphery of the piston rod 03 and the coupling devices 010 and 011 is set to a minimum necessary size. By doing so, the first to third bellows 15
The amplitude of the vibration generated in the 13 itself can be suppressed to about the size of the gap 8, and it is wound and attached to these peaks 16 and valleys 17, respectively. Therefore, the external force due to the vibration acting on the optical fiber cable 20 and the power supply cable 21 can be further reduced, and the damage can be further suppressed.

Next, FIG. 7 is a partial sectional view showing a third embodiment of the cable protection device of the present invention. In the present embodiment, the first to the second embodiments are used as flexible members.
Instead of the third bellows 15, 14, and 13, a spring-shaped flat plate is formed on the outer periphery of the piston rod 03 without completely covering the outer periphery of the piston rod 03, though it is formed in a spiral shape. 24.

The outer peripheral portion of the flat plate 24, that is, the peak portion 16
The optical fiber cable 20 and the power supply cable 21 are attached to the inner peripheral portion, that is, the valley portion 17. This flat plate 24 is also divided into three similarly to the first to third bellows 15, 14, and 13 of the second embodiment, and a gap is similarly provided so that the outer periphery of the piston rod 03 and the connecting device 01 are formed.
0, 011 and are arranged on the outer circumference of the first and second embodiments.
The same actions and effects as those of the third bellows 15, 14, and 13 are achieved.

[0058]

As described above, the cable protection device according to the present invention comprises an outer cylinder, an inner cylinder that slides inside and contracts in response to a change in the distance between the movable parts, an inner cylinder that expands and contracts, and an outer cylinder. A cable which is inserted through the inside of the inner cylinder and which is extended or bent in accordance with expansion and contraction of the inner cylinder is provided.

As a result, the cables installed on the movable part are gathered in the outer cylinder and the inner cylinder, and extend or bend in accordance with the change in the length between the outer cylinder and the inner cylinder. Even when the weight per unit length is increased due to the increase in the number of measuring points, or the like, it is installed on a movable part with an interval of ± 1 m, it does not swing and damage occurs. And prevent the occurrence of accidents due to cable damage, ensure that measurement data measured by the test specimen on the shaking table, etc., and improve the reliability of the acquired measurement data be able to. In addition, since damage can be prevented, recovery work and the like become unnecessary, and cost can be reduced and efficiency of a vibration test and the like can be improved.

Further, the cable protection device of the present invention includes a hanging member for suspending a cable inserted through a cylindrical body having an outer cylinder and an inner cylinder having variable lengths. A plurality of each are provided inside.

As a result, the cable elongates or bends slowly inside the cylindrical body, and the cable elongates or bends more closely to the fluctuation of the interval generated in the movable part. The expansion and contraction of the cable itself due to the fluctuation of the weight or the weight of the cable itself can be reduced, the stress generated in the cable can be further reduced, the occurrence of damage can be further reduced, and the inside of the cylinder at the time of extension or bending can be reduced. In this case, the movement of the cable can be made smoother, the load generated due to the internal movement can be reduced, and the occurrence of damage can be reduced.

Further, in the cable protection device of the present invention, one end of the outer cylinder is connected to one of the fixed portion and the vibration table, and one end of the inner cylinder is not connected to one end of the outer cylinder. It is connected to one of the base and the fixed portion, and both connections are made by a rotatable connection mechanism.

As a result, with the operation of the shaking table, the connecting mechanism freely moves in the entire circumferential direction, and the axial direction of the outer cylinder and the inner cylinder also fluctuates in accordance with the vibration direction.
The cable inserted into the outer cylinder and the inner cylinder follows freely in accordance with the movement of the inner cylinder and the outer cylinder. Even if the vibration of the amplitude is generated, the load is not applied to the cable, the damage is not generated, and a highly reliable vibration device can be obtained.

Further, the cable protection device of the present invention is provided with a flexible member which is provided with a spiral crest and a valley, and which can be expanded and contracted and bent, and a crest and a valley of the flexible member. Of these, at least one cable is provided.

As a result, the expansion and contraction of the cable becomes substantially the same as that of the flexible member which expands and contracts in accordance with the change in the distance between the movable parts, so that the load generated on the cable can be reduced and the optical fiber cable can be used as the cable. Therefore, the transmission amount of measurement data per cable can be increased, and even when the number of measurement points and the like increases, the number of cables can be reduced.
The cable weight per unit length can be reduced in conjunction with the change of the cable material and the reduction of the cable diameter.

Further, in the cable protection device of the present invention, one end of the flexible member is connected to a fixed portion erected on the ground, and the other end is connected to a vibrating table which vibrates by moving relative to the fixed portion. It was taken.

As a result, the cable expands and contracts following the vibration generated in the vibration table. Therefore, even when the cable is installed between the vibration table and a fixed portion that generates vibration having a relatively large amplitude, the cable can be extended. In this case, a load is not applied, damage can be prevented, and there is no problem in obtaining measurement data, and a highly reliable shaking table can be obtained from which reliable measurement data can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of a cable protection device according to the present invention in a partial cross-sectional view;

2A is a detailed view of a portion A shown in FIG. 1, FIG. 2A is a plan view, FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A,

3 is a cross-sectional view taken along a line BB in FIG.

FIG. 4 is a detailed view of a part C shown in FIG. 3,

FIG. 5 is an overall sectional view showing a second embodiment of the cable protection device of the present invention,

FIG. 6 is a detailed view of a part D shown in FIG. 5,

FIG. 7 is a partial sectional view showing a third embodiment of the cable protection device according to the present invention;

FIG. 8 is a side view showing an example of a state of erection of a cable erected between a conventional shaking table and a fixed part,

FIG. 9 is a cross-sectional view showing another example of a state in which a cable is laid between a conventional vibration table and a fixed portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Inner cylinder 3 Sliding part 4 Hanging tool 5, 5A, 5B Cable fixing tool 6, 6A, 6B Connection mechanism 7 Cable 8 Vibration table 9 Fixing part 10 Flange 11 Bolt, nut 12 Sliding member 13 Third bellows 14 second bellows 15 first bellows as flexible member 16 peak 17 valley 18 rotating ring 19 flat plate as flexible member 20 optical fiber cable 21 power supply cable 22 power supply connector 23 optical fiber connector 01 Exciter 02 Cylinder 03 Piston rod 04 Injection port 05 Attachment part 06 Cable 07 Cable 08 Shaking table (vibration device) 09 Fixed part (base part) 010 Connection device 011 Connection device

Claims (5)

[Claims] 1. An outer cylinder, an inner cylinder slidably disposed inside the outer cylinder, and an inner cylinder disposed inside the outer cylinder and the inner cylinder, the inner cylinder being slidable in correspondence with the sliding of the inner cylinder. And a cable which is in an extended or bent state. 2. The cable protection device according to claim 1, wherein a plurality of suspenders are provided inside the outer cylinder and the inner cylinder, respectively, and suspenders are provided to suspend the cable. 3. An end of the outer cylinder is rotatably connected to one of a fixed part or a vibration table that moves relatively to the fixed part, and one end of the inner cylinder moves relatively to the fixed part or the fixed part. 3. The cable protection device according to claim 1, wherein the other of the vibrating tables that is not connected to the outer cylinder is rotatably connected. 4. A helical ridge and a valley are provided, and a flexible member which is made expandable and contractible, and a cable disposed on at least one of the ridge and the valley are provided. And cable protection device. 5. The cable protection device according to claim 4, wherein one end of the flexible member is connected to a fixed portion, and the other end is connected to a vibration table that moves relatively to the fixed portion.