Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
  • H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
  • H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
  • B25B25/00—Implements for fastening, connecting or tensioning of wire or strip
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G7/00—Overhead installations of electric lines or cables
  • H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device

Definitions

• the present invention relates to an expander and a wire tensioning device.
• Patent Document 1 discloses an extender that performs extension and contraction operations by manually rotating a bolt.
• the present invention provides an extender and a wire tensioning device that can perform wire tensioning work easily and accurately.
• an expander that is used when stretching a wire.
• This telescoping machine includes a telescoping main body and a power section.
• the expander main body includes an outer cylinder part, an inner cylinder part inserted into the outer cylinder part from one end in the axial direction, a threaded shaft inserted into the outer cylinder part and the inner cylinder part, and a threaded shaft inserted into the outer cylinder part from one end in the axial direction. It has a moving part that has a nut fixed to the other end and screwed onto the screw shaft, and an operation part that moves the nut along the screw shaft by rotating the screw shaft around the axis.
• the power section is detachably attached to the expander body. It has an engaging part that engages with the operating part and a motor that rotates the engaging part.
• FIG. 1 is a front view showing a first embodiment of the wire tensioning device of the present invention.
• FIG. 2 is a perspective view showing the structure of the support on the left side in FIG.
• FIG. 3 is a perspective view showing the structure of the support on the right side in FIG.
• FIG. 4 is a longitudinal cross-section showing the configuration of the movable part and the vicinity of the drive part in the expander of the first embodiment.
• FIG. 5 is a perspective view (internal transparent view) schematically showing the configuration of the movable part in the expander of the first embodiment.
• FIG. 6 is a perspective view showing a state in which the power unit is attached to the extender main body in the extender of the first embodiment.
• FIG. 7 is a perspective view showing a state in which the power unit is separated from the extender main body in the extender of the first embodiment.
• FIG. 8 is a sectional view taken along line AA in FIG.
• FIG. 9 is a partial cross-sectional view for explaining the procedure for attaching the power unit to the extender main body in the extender according to the first embodiment.
• FIG. 10 is a block diagram showing the configuration of a control board in the expander according to the first embodiment.
• FIG. 11 is a longitudinal cross-sectional view showing the structure of the vicinity of the fixing member in the expander of the second embodiment.
• FIG. 12 is a perspective view showing the configuration of the fixing member in the expander of the third embodiment.
• the program for realizing the software appearing in this embodiment may be provided as a non-transitory computer-readable medium, or may be downloaded from an external server.
• the program may be provided in a manner that allows the program to be started on an external computer and the function thereof is realized on the client terminal (so-called cloud computing).
• the term "unit” may include, for example, a combination of hardware resources implemented by circuits in a broad sense and software information processing that can be concretely implemented by these hardware resources.
• various types of information are handled in this embodiment, and these information include, for example, the physical value of a signal value representing voltage and current, and the signal value as a binary bit collection consisting of 0 or 1. It is expressed by high and low levels or quantum superposition (so-called quantum bits), and communication and calculations can be performed on circuits in a broad sense.
• a circuit in a broad sense is a circuit realized by at least appropriately combining a circuit, a circuit, a processor, a memory, and the like. That is, Application Specific Integrated Circuit (ASIC), programmable logic device (for example, Simple Programmable Logic Device (SPLD)), complex programmable logic Device (Complex Programmable Logic Device: CPLD) and field This includes a field programmable gate array (FPGA) and the like.
• ASIC Application Specific Integrated Circuit
• SPLD Simple Programmable Logic Device
• CPLD Complex Programmable Logic Device
• FPGA field programmable gate array
• FIG. 1 is a front view showing a first embodiment of the wire tensioning device of the present invention.
• 2 and 3 are perspective views showing the structure of the support shown in the figures, respectively.
• the upper side of FIGS. 1 to 3 (the same applies to FIGS. 4 to 6, 11 and 12) will be referred to as “upper” or “upper”, and the lower side will be referred to as “lower” or “lower”. ” he says. Further, in FIGS. 1 to 3 (the same applies to FIGS.
• a wire tensioning device 100 shown in FIG. 1 is used, for example, when cutting a covered electric wire 700 in an overhead state.
• the covered electric wire 700 is shown by a two-dot chain line.
• This wire tensioning device 100 includes a pair of wire grippers 10 for holding a covered electric wire (overhead wire) 700, and a long wire whose both ends are connected to these wire grippers 10 via connectors 500 and 510. It is equipped with an expander 1. The lengthwise dimension of the extender 1 is expanded or contracted by driving the drive unit 4 provided on the right side (the other side) in the longitudinal direction of the extender 1.
• a first link piece 50 and a second link piece 52 are pivotally supported on the lower side of the base portion 40 of the wire gripper 10 so as to be swingable.
• the swinging end of the first link piece 50 and the swinging end of the second link piece 52 are both connected to the operating arm 60, forming a parallel link mechanism.
• the covered electric wire 700 is held between the upper wire gripping body 20 and the lower wire gripping body 30 from above and below.
• the upper wire gripping body 20 is fixed to the base portion 40.
• the lower wire gripping body 30 is connected above the first link piece 50 and the second link piece 52 so that it can approach and move away from the upper wire gripping body 20.
• the lower wire gripping body 30 is displaced upward, that is, approaches the upper wire gripping body 20, and can grip the covered electric wire 700.
• a support ring 80 is provided on the base portion 40 so as to protrude upward.
• This support ring 80 is an annular body constituting a lifting tool locking body, and can be suspended by a remote control tool and the wire gripper 10 can be lifted.
• the lower wire gripping body 30 is provided with a tightening portion 82 that protrudes downward. By rotating the tightening portion 82, the covered electric wire 700 can be tightened between the upper wire gripping body 20 and the lower wire gripping body 30.
• the wire tensioning device 100 also includes a pair of supports 400A and 400B attached to the expander 1.
• the supports 400A and 400B include a substantially C-shaped support main body 413 having an opening 410 on one side, and a closure that closes the opening 410 of the support main body 413. It has a piece 414. According to this configuration, after the covered electric wire 700 is introduced into the inside of the support body 413 through the opening 410, the opening 410 of the support body 413 is closed with the closing piece 414, thereby allowing the covered electric wire 700 to expand and contract.
• the container 1 can be supported.
• an engagement piece 420 that engages with the closure piece 414 when the opening 410 is closed by the closure piece 414 is rotatably provided at the end of the support main body 413 facing the opening 410.
• the support 400A has a through hole 416 formed in the lower part of the support main body 413, into which the expander 1 (moving shaft portion 3) is inserted.
• a through hole 418 is formed in the lower part of the support main body 413, into which the expander 1 (main body cylindrical portion 2) is inserted.
• the support 400B is provided with a fixing part 430 at the lower part of the support main body 413 for fixing the expander 1 at a desired longitudinal position or at a rotation angle around a predetermined axis.
• operating sections 432 and 434 are provided on both sides for operating the fixing section 430 with a remote control tool. According to this support 400B, it is possible to perform an operation (sorting operation) of changing the direction of the end of the right covered wire 700 after cutting so that the ends of the cut wire 700 do not come into contact with each other. .
• FIG. 4 is a longitudinal cross-section showing the configuration of the movable part and the vicinity of the drive part in the expander of the first embodiment.
• FIG. 5 is a perspective view (internal transparent view) schematically showing the configuration of the movable part in the expander of the first embodiment.
• the extender 1 includes an extender main body 11.
• This extender main body 11 has a main body cylindrical portion 2 having a cylindrical shape, and a small diameter cylindrical moving shaft portion (inner cylindrical portion) 3 provided so as to be relatively movable in the longitudinal direction of the main body cylindrical portion 2.
• the main body cylindrical portion 2 is fixed to a cylindrical portion (outer cylindrical portion) 21 made of aluminum or FRP (fiber reinforced plastic), for example, and to the right end (other end) of this cylindrical portion 21 in the axial direction. It is composed of a moving part 22.
• the moving shaft portion 3 is inserted into the cylindrical portion 21 from the left end (one end) in the axial direction.
• the moving shaft portion 3 is made of, for example, FRP.
• the movable part 22 has a casing 221 made of, for example, an aluminum alloy, a threaded shaft 222 inserted through the cylindrical part 21 and the moving shaft part 3, and a nut 223 screwed into the threaded shaft 222.
• the right end of the screw shaft 222 in the axial direction protrudes from the cylindrical portion 21 into the casing 221 .
• the nut 223 has a hexagonal outer shape, and a connecting portion 2231 that protrudes to the left in the axial direction and has a hexagonal outer shape is formed.
• the axially right end (other end) of the movable shaft portion 3 is inserted and fixed inside this connecting portion 2231 .
• the nut 223 is preferably made of iron-based metal material.
• the inner circumferential surface of the cylindrical portion 21 has a hexagonal shape corresponding to the outer shape of the connecting portion 2231. Therefore, the nut 223 is prevented from rotating about the axial direction with respect to the cylindrical portion 21.
• the drive unit 4 includes an operating unit 44 that protrudes from the lower surface of the casing 221 and is rotatably operated, and a power transmission unit that is connected to the operating unit 44 and the threaded shaft 222 and housed within the casing 221. It has a mechanism 45.
• the power transmission mechanism 45 includes a shaft 451 fixed to the operating section 44 , a bevel gear 452 attached to the upper end of the shaft 451 (an end opposite to the operating section 44 ), and a bevel gear 452 on the right side of the screw shaft 222 .
• a bevel gear 453 is attached to the end (the other end) and meshes with the bevel gear 452.
• the operating section 44 is configured to operate the power transmission mechanism 45 to rotate the threaded shaft 222 around the shaft.
• the nut 223 can reciprocate along the screw shaft 222 while being guided by the inner peripheral surface of the cylindrical portion 21.
• the movable shaft portion 3 connected to the nut 223 moves in and out of the cylindrical portion 21, and the extender main body 11 expands or contracts.
• a sensor (position detection section) 5 configured to detect the position of the nut 223 is provided on the outer peripheral side of the cylindrical portion 21 .
• the sensor 5 can be composed of a magnetic sensor, an optical sensor, a contact sensor (limit sensor), or the like.
• the sensor 5 is preferably a magnetic sensor. In this case, it is easier to detect the position of the nut 223 more accurately.
• a fixing member 520 is provided at the right end (other end) in the axial direction of the movable portion 22 (cylindrical portion 21) so as to be rotatable about the axis of the screw shaft 222. As shown in FIG. 1, this fixing member 520 can lock a connecting tool 500, and is configured to connect the wire gripper 10 via this connecting tool 500. Note that a fixing member 520 capable of locking the connector 500 is also provided at the left end (one end) of the moving shaft portion 3. Similarly to the above, the wire gripper 10 is connected to the fixing member 520 via the connector 500. As shown in FIG. 4, a disk-shaped flange portion 46 is fixed to the end portion of the casing 221 on the operating portion 44 side. Further, on the lower surface of the flange portion 46, a plurality of (four in this embodiment) pins 47 that protrude downward (towards the operating portion 44) are provided (see FIG. 7, which will be described later).
• a power unit (power section) 1000 is removably attached to the operation section 44 of the telescopic body 11 as described above and its vicinity. That is, the extender 1 includes a power unit 1000.
• the operating portion 44 protrudes from the expandable body 11 in a direction substantially perpendicular to the axial direction of the screw shaft 222. Therefore, the operation of attaching and detaching the power unit 1000 to and from the extender main body 11 can be performed relatively easily.
• FIG. 6 is a perspective view showing a state in which the power unit is attached to the extender main body in the extender of the first embodiment.
• FIG. 7 is a perspective view showing a state in which the power unit is separated from the extender main body in the extender of the first embodiment.
• FIG. 8 is a sectional view taken along line AA in FIG.
• FIG. 9 is a partial cross-sectional view for explaining the procedure for attaching the power unit to the extender main body in the extender according to the first embodiment.
• the upper side in FIGS. 8 and 9 will be referred to as “upper” or “upper”, and the lower side will be referred to as “lower” or “lower”.
• the power unit 1000 shown in FIG. 6 includes a case 1100, a mounting section 1200, a fixing mechanism 1300, a grip section 1400, and a cover 1500.
• Case 1100 is composed of a rectangular parallelepiped member.
• a motor 1700 is housed within the case 1100, and a motor body 1710 is fixed to the case 1100.
• Mounting section 1200 is connected to case 1100.
• This attachment part 1200 is a part to be attached to the extender main body 11, and is made of a cylindrical member.
• the mounting section 1200 accommodates the operating section 44 with the power unit 1000 mounted on the extender main body 11.
• the mounting portion 1200 accommodates an engaging portion 1600 that engages with the operating portion 44 .
• the engaging portion 1600 has a groove 1610 that opens upward and a connecting shaft 1620 that projects downward.
• the connecting shaft 1620 is connected to the rotating shaft 1720 of the motor 1700 via the connecting portion 1800.
• motor 1700 can rotate engagement portion 1600.
• the rotational force of the motor 1700 can be transmitted to the operating section 44 that engages with the engaging section 1600, and further transmitted to the screw shaft 222 via the power transmission mechanism 45.
• the telescoping body 11 expands or contracts as described above.
• a ring portion 1210 that contacts the flange portion 46 is formed on the inner circumferential surface of the mounting portion 1200 to protrude radially inward along the circumferential direction. Further, a plurality of through holes 1211 are formed in the ring portion 1210 in the thickness direction thereof. In this embodiment, the number of through holes 1211 installed is four, corresponding to the number of pins 47 installed. A pin 47 is inserted into each through hole 1211 with the power unit 1000 attached to the expander main body 11. Thereby, rotation of the power unit 1000 with respect to the extender main body 11 can be prevented. That is, in this embodiment, the pin 47 and the through hole 1211 constitute a rotation prevention mechanism for the extender main body 11 of the power unit 1000.
• the number of pins 47 and through holes 1211 is not limited to four, and may be one or more, preferably two or more. Furthermore, the number of pins 47 installed may be the same as the number of through holes 1211 installed, or may be less than the number of through holes 1211 installed. That is, the number of pins 47 installed and the number of through holes 1211 installed may be the same or different.
• the fixing mechanism 1300 is a mechanism that fixes the case 1100 to the extender main body 11 with the power unit 1000 attached to the extender main body 11.
• This fixing mechanism 1300 is provided as a pair on the outer peripheral side of the mounting portion 1200.
• Each fixing mechanism 1300 includes a lever 1310 that is locked to the flange portion 46, a slider 1320 that operates to displace the lever 1310, a coil spring 1330 that biases the lever 1310, and a guide member 1340 that guides the movement of the slider 1320.
• the lever 1310 has a claw 1311 provided at the upper end and in contact with the flange 46, a spring seat 1312 of a coil spring 1330 provided at the lower end, and a shaft 1313 serving as the center of rotation.
• the slider 1320 includes a pressing portion 1321 provided at the upper end that contacts and presses the spring seat 1312 from the outer circumferential side, and an operation provided at the lower end that slides (moves) the slider 1320 in the vertical direction. It has a ring 1322. It should be noted that the opposing surfaces of the spring seat 1312 and the pressing portion 1321 are each formed of an inclined surface.
• the pressing part 1321 presses and displaces the spring seat 1312 toward the inside of the mounting part 1200 in the radial direction along the inclined surface.
• the claw 1311 rotates (displaces) radially outward of the mounting portion 1200 (see FIGS. 9(a) and 9(b)).
• the coil spring 1330 is compressed against the biasing force and is in a compressed state.
• the pressing part 1321 is moved upward from this state, the coil spring 1330 uses its urging force to press the spring seat 1312 toward the outside in the radial direction of the mounting part 1200 and displace it.
• the claw 1311 rotates (displaces) inward in the radial direction of the mounting portion 1200 (see FIGS. 8 and 9(c)).
• Grip section 1400 is provided at the lower end of case 1100.
• This grip portion 1400 is a portion that is gripped by a remote control tool (indirect tool). By grasping the grip portion 1400 with a remote control tool, it is possible to lift the power unit 1000, attach it to the extender main body 11, and detach it from the extender main body 11.
• the cover 1500 has water resistance and liquid-tightly seals the power supply section 7 and the control board 9 therein. Note that when the power unit 1000 is attached to the expander body 11, the power supply unit 7 and control board 9 are connected to electronic components on the expander body 11 side, such as the sensor 5 and a load cell 63 (described later), through electrical wiring (not shown). is configured to be
• the power supply section 7 includes a battery and a battery mounting section into which the battery is detachably mounted. Power supply section 7 supplies power to at least motor 1700.
• the power supply unit 7 can supply power to the sensor (position detection unit) 5, motor 1700, and the like.
• the battery may be, for example, a dry battery, a primary battery such as a solar battery, a secondary battery such as a lithium ion battery, or the like.
• FIG. 10 is a block diagram showing the configuration of a control board in the expander according to the first embodiment. Control board 9 controls at least motor 1700.
• the control board 9 shown in FIG. 10 is, for example, a dedicated control device for a sensor (position detection unit) 5, a motor 1700, etc. electrically connected thereto.
• This control board 9 has a communication section 91, a storage section 92, and a control section 93, and these components are electrically connected via a communication bus 90.
• the communication unit 91 is configured to be able to transmit various electrical signals from the control board 9 to external components. Furthermore, the communication unit 91 is configured to be able to receive various electrical signals from external components to the control board 9. More preferably, the communication unit 91 has a network communication function, so that various information can be communicated with external devices via a network such as the Internet.
• the communication unit 91 is preferably a wired communication means such as USB, IEEE1394, Thunderbolt (registered trademark), wired LAN network communication, etc., it is also suitable for wireless LAN network communication, mobile communication such as 3G/LTE/5G, or BLUETOOTH (registered trademark). Communication etc. may be included as necessary. That is, it is more preferable to implement it as a set of these plurality of communication means.
• the storage unit 92 stores various information defined by the above description. This may be used, for example, as a storage device such as a solid state drive (SSD) that stores various programs related to the expander 1 executed by the control unit 93, or as a temporary storage device related to program calculations. It can be implemented as a memory such as a random access memory (RAM) that stores necessary information (arguments, arrays, etc.).
• the storage unit 92 stores various programs and variables related to the expander 1 executed by the control unit 93. Particularly preferably, information regarding a construction plan to be performed using the expander 1 is stored.
• the control unit 93 processes and controls the overall operation related to the expander 1.
• the control unit 93 is, for example, a central processing unit (CPU) not shown.
• the control unit 93 implements various functions related to the expander 1 by reading a predetermined program stored in the storage unit 92. That is, information processing by software stored in the storage section 92 is specifically implemented by the control section 93, which is an example of hardware.
• the control section 93 is not limited to a single control section, and may be implemented so as to have a plurality of control sections 93 for each function. It may also be a combination thereof.
• the supports 400A and 400B are attached to the covered electric wire 700 using a remote control tool.
• a pair of wire grippers 10 connected to both ends of the expander 1 are attached to the covered electric wire 700 using a remote control tool. Specifically, the remote control tool is hooked onto the support ring 80, and the wire gripper 10 is suspended. Then, the covered electric wire 700 is inserted between the upper wire gripping body 20 and the lower wire gripping body 30, and the upper wire gripping body 20 is hooked onto the covered electric wire 700.
• the mounting part 1200 When the mounting part 1200 is further brought closer to the operating part 44 of the telescoping body 11, the outer peripheral side of the operating part 44 is covered with the mounting part 1200, and the operating part 44 is inserted into the groove 1610 of the engaging part 1600 (FIG. 9(b) )reference).
• the engaging portion 1600 engages with the operating portion 44.
• the pins 47 are inserted into the corresponding through holes 1211, thereby preventing the power unit 1000 from rotating relative to the expander main body 11.
• the slider 1320 is slid upward, the claw 1311 of the lever 1310 is displaced inward in the radial direction of the mounting portion 1200, as described above.
• the motor 1700 is operated using an external terminal (not shown) to rotate the rotating shaft 1720 in a predetermined direction.
• the operating section 44 that engages with the engaging section 1600 also rotates in the same direction.
• the screw shaft 222 connected to the power transmission mechanism 45 rotates around the axis, and the nut 223 screwed onto the screw shaft 222 moves rightward along the longitudinal direction of the screw shaft 222.
• the movable shaft portion 3 fixed to the nut 223 also moves to the right and is drawn into the cylindrical portion 21 . That is, the expandable body 11 contracts.
• the pair of wire grippers 10 sandwiching the covered wire 700 can be brought close to each other.
• the covered wire 700 is kept in a tensioned state on the outside of the wire grippers 10 of the covered wire 700, and is relaxed at the portion of the covered wire 700 between the two wire grippers 10.
• the process involves cutting the wires using an indirect live wire cutting tool. Also, at this time, the operation of the motor 1700 is stopped by operating the external terminal. Thereby, the contracted state of the expandable body 11 can be maintained.
• the power unit 1000 may be attached to the extender main body 11 prior to the above steps [1] to [3].
• FIG. 11 is a longitudinal cross-sectional view showing the structure of the vicinity of the fixing member in the expander of the second embodiment.
• the right end (other end) in the axial direction of the movable part 22 is configured to detect the tension applied to the covered wire (wire) 700.
• a tension detection section 6 configured as shown in FIG. In this embodiment, the tension detection section 6 is fixed to the casing 221 (the right end of the main body cylinder section 2) of the movable section 22 via the spacer 23.
• the tension detection unit 6 includes a casing 61 , a stress applying member 62 having a T-shaped cross section, and a load cell (pressure sensor) 63 disposed between the casing 61 and the stress applying member 62 .
• the stress applying member 62 includes a disk-shaped portion 621 and a rod-shaped portion 622 that projects from the disk-shaped portion 621 to the right side in the axial direction.
• the rod-shaped portion 622 is provided to penetrate the casing 61, and a fixing member 520 is fixed (connected) to the right end in the axial direction.
• the load cell 63 is placed in contact with the disc-shaped portion 621 and the casing 61 .
• the stress applying member 62 fixed thereto is also pulled, and the disk-shaped portion 621 compresses the load cell 63 (that is, applies stress to the load cell 63). Thereby, the tension applied to the covered wire 700 can be detected.
• the expandable device 1 of the second embodiment also provides the same functions and effects as the expandable device 1 of the first embodiment.
• the tension detection section 6 it is possible to prevent more tension than necessary from being applied to the covered electric wire 700. Therefore, wire tensioning work can be carried out safely.
• the above effects can be further improved.
• a sensor that can measure the value of the current flowing through the motor 1700 may be provided.
• the torque when the motor 1700 is driven can be determined. Specifically, as the current value increases, the torque when driving the motor 1700 increases, so by measuring the current value flowing through the motor 1700, it is possible to prevent unnecessary tension from being applied to the covered wire 700. can do.
• the motor 1700 stops rotating and the current value flowing through the motor 1700 increases. Therefore, by measuring the value of the current flowing through the motor 1700, the position of the nut 223 can also be detected.
• FIG. 12 is a perspective view showing the configuration of the fixing member in the expander of the third embodiment.
• the fixing member 530 shown in FIG. 12 has a cylindrical shape, and is provided at the right end (other end) in the axial direction of the movable section 22, or is joined to the stress applying member 62, or is formed integrally with it. There is.
• the fixing member 530 has a groove 530a formed along the axial direction and a through hole 530b formed to penetrate in a direction substantially perpendicular to the axial direction.
• the operating arm 60 of the wire gripper 10 also has a through hole 60a formed at its left end (one end) along a direction substantially perpendicular to the axial direction. The left end of the operating arm 60 is inserted into the groove 530a of the fixing member 530, and the through hole 530b and the through hole 60a are aligned.
• the expandable device 1 of the third embodiment also provides the same functions and effects as the expandable device 1 of the first and second embodiments.
• the type of wire gripper 10 is also selected depending on the type of wire to be held. Then, depending on the configuration (shape) of the operating arm 60 of the selected wire gripper 10, the extender 1 having the fixing member 530 or the fixing member 520 with a shape (configuration) suitable for connection is selected. Note that when the tension detection unit 6 is omitted, the fixing member 530 (the same applies to the fixing member 520) is provided at the right end (other end) of the movable unit 22 in the axial direction.
• the extension/retraction operation of the extender main body 11 is configured to be performed by the power unit 1000 having the motor 1700. Therefore, the expandable/retractable device 1 itself assists in operations that require a large amount of force, resulting in good operability.
• the power unit 1000 is detachably attached to the extender main body 11. Therefore, depending on the force required to rotate the screw shaft 222, the power unit 1000 can be easily replaced with a motor 1700 having a different torque.
• the power source and control board for the sensor 5 may be separately incorporated into the expander main body 11.
• the extender main body 11 may be used as the extender 1 without attaching the power unit 1000.
• a remote operating tool is engaged with the operating section 44, and the operating section 44 is rotated with this remote operating tool.
• work that conventionally required two workers riding on a bucket in the air can now be performed by a single worker, resulting in excellent workability.
• the remaining one worker can grasp the working status of the workers on the bucket on the ground and issue accurate instructions, resulting in high safety.
• the expansion and contraction of the expandable body 11 can be performed accurately.
• the tension detection section 6 it is possible to prevent the covered electric wire 700 from being pulled more than necessary, and to prevent the covered electric wire 700 from breaking.
• data obtained from these detection units during work can be transmitted to an external terminal (for example, a tablet terminal, etc.) via the communication unit 91 of the control board 9 and stored therein. Based on the obtained data, it is possible to check the work history, manage whether or not the expander 1 needs to be repaired, etc., which is also preferable from the viewpoint of improving safety.
• the external terminal may be a foot switch, a voice recognition device, or the like. In this case, even when working alone, both hands can be freed when operating the extender main body 11. Further, even when working on a plurality of covered wires (wire bodies) 700 simultaneously using the wire tensioning device 100, the wire tensioning work can be performed using one external terminal. Furthermore, in the present invention, any two or more configurations of the first to third embodiments may be combined.
• a plurality of sensors 5 may be provided along the axial direction of the cylindrical portion 21.
• the configuration is such that one sensor 5 detects the position of the nut 223 to prevent the movable shaft portion 3 from protruding more than necessary from the cylindrical portion 21 (main body cylindrical portion 2) and falling off. Can be done.
• the initial position of the moving shaft portion 3 relative to the cylindrical portion 21 (main body cylindrical portion 2) can be defined (set).
• the movable shaft portion 3 is configured to be prevented from retreating more than necessary with respect to the cylindrical portion 21 (main body cylindrical portion 2). be able to.
• each aspect described below may be provided.
• a stretcher used when pulling a wire comprising a stretcher main body and a power section, and the stretcher main body has an outer cylindrical section and an axial end extending from the outer cylindrical section to the outer cylindrical section. an inner cylindrical portion inserted into the inner cylindrical portion; a threaded shaft inserted into the outer cylindrical portion and the inner cylindrical portion; and a nut fixed to the other axial end of the inner cylindrical portion and screwed onto the threaded shaft. and an operating portion that moves the nut along the screw shaft by rotating the screw shaft around the axis, and the power portion is removably attached to the expander body.
• An engaging part that is mounted and engages with the operating part, and a motor that rotates the engaging part.
• the operating portion protrudes from the extender main body in a direction substantially perpendicular to the axial direction of the screw shaft.
• the power section further includes a case accommodating the motor, and a mounting section connected to the case and accommodating the engaging section. and a fixing mechanism for fixing the case to the expander body.
• the extender according to any one of (1) to (4) above further includes a power transmission mechanism connected to the screw shaft, and the operating section operates the power transmission mechanism. and configured to rotate the screw shaft around the axis.
• a wire tensioning device comprising a pair of wire grippers and an expander, the expander comprising the expander according to any one of (1) to (7) above,
• the pair of wire grippers are each connected to an end of the telescoping device. Of course, this is not the case.
• Extendable device 11 Extendable device main body 2 : Main body cylinder part 21 : Cylindrical part 22 : Operating part 221 : Casing 222 : Screw shaft 223 : Nut 2231 : Connection part 23 : Spacer 3 : Moving shaft part 4 : Drive part 44 : Operating part 45 : Power transmission mechanism 451 : Shaft part 452 : Bevel gear 453 : Bevel gear 46 : Flange part 47 : Pin 5 : Sensor 6 : Tension detection part 61 : Casing 62 : Stress applying member 621 : Disc-shaped part 622 : Rod-shaped part 63: Load cell 7: Power supply section 9: Control board 90: Communication bus 91: Communication section 92: Storage section 93: Control section 10: Wire grip 20: Upper wire grip 30: Lower wire grip 40: Base Part 50 : First link piece 52 : Second link piece 60 : Operation arm 60a : Through hole 80 : Support ring 82 : Tighten

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