JP2021191047A - High place working vehicle - Google Patents

Abstract

To provide a high place working vehicle which can suppress power consumption for transmitting information from a temporary support device.SOLUTION: A high place working vehicle comprises: an upper part control device 50 which controls an actuation of a boom provided to a vehicle body; a bench and a sub-boom provided at the tip of the boom; an electric wire support member provided at the tip of the sub-boom to support a laid electric wire; a load detection device 80 which detects a load applied to the electric wire support member; a transmitter 83 which transmits information regarding the load detected by the load detection device 80 to the upper part control device 50 at first time intervals; a battery 85 which supplies power to the transmitter 83; and a transmission control device 84 which controls transmission by the transmitter 83, in which the transmission control device 84 controls transmission intervals of the information regarding the load to second time intervals longer than the first time intervals when a period in which a rate of change of the load detected by the load detection device 80 becomes a predetermined value or less continues for predetermined time.SELECTED DRAWING: Figure 4

Description

The present invention relates to an aerial work platform provided with a temporary support device for supporting an erected electric wire.

Conventionally, aerial work platforms have been used for electrical installation work such as utility pole replacement work and replacement work of various devices (for example, transformers and insulators) installed on utility poles, and are included in this type of aerial work platform. For example, as disclosed in Patent Document 1, there is one provided with a work table and a sub-boom device capable of undulating at the tip of a boom provided on the vehicle so as to be undulating. In addition, there are some that have diversified the uses of the sub-boom device by making the member attached to the tip of the sub-boom device replaceable. For example, when a sheave member (guide pulley) on which a winch rope can be hung is attached to the tip of the sub-boom device, it can be used as a crane device for raising and lowering heavy objects. Further, when a wire support member capable of supporting an electric wire erected between utility poles is attached to the tip of the sub-boom device, it can be used as a temporary support device for the electric wire.

Japanese Patent No. 6418931

By the way, in the aerial work platform used for electrical construction work as described above, even if the sub-boom device or the like touches the electric wire, the workers on the workbench may get an electric shock or the vehicle may be damaged. There are some that electrically insulate between the temporary support device and the operating table and between the work table and the vehicle so as not to give. In such aerial work platforms, in order to maintain electrical insulation between the temporary support device, the workbench, and the vehicle body, information transmission between them cannot be performed via a conductive signal line. ..

Therefore, it is necessary to transmit the load-related signal detected by the temporary support device, the control signal related to the operation of the boom, and the like wirelessly or by converting the electric signal into an optical signal via an optical fiber. Further, when transmitting signals from the temporary support device or the workbench, it is necessary to electrically insulate each other, so that power for signal transmission cannot be supplied from the vehicle side, and the temporary support device and the temporary support device and the work table Batteries will be installed on the workbench as independent power sources.

On the other hand, once the electric wire is temporarily supported, the state is maintained during the above-mentioned electrical installation work. Therefore, it is desirable that the battery mounted on the temporary support device or the workbench has a large capacity in order to cope with the electrical construction work that requires a long time. However, a large-capacity battery generally has a large external dimension and a large weight. Therefore, for example, when a large-capacity battery is mounted on a temporary support device, the work is performed when moving the temporary support device closer to an electric wire. There is a risk of reducing the visibility of the battery.

Therefore, it is particularly desirable that the battery mounted on the temporary support device is small and lightweight and has a small capacity. It is necessary to reduce the power consumption for performing signal transmission and the like as much as possible.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an aerial work platform capable of suppressing power consumption for transmitting information from a temporary support device.

In order to solve the above problems, the high-altitude work vehicle according to the present invention has a boom (for example, the boom 30 in the embodiment) undulatingly provided on the vehicle body (for example, the vehicle body 2 in the embodiment) and the operation of the boom. (For example, the upper control device 50 in the embodiment), a work table rotatably provided on a horizontal plane at the tip of the boom (for example, the work table 40 in the embodiment), and the boom. A sub-boom (for example, the sub-boom device 70 in the embodiment) provided at the tip of the sub-boom so as to be rotatable and undulating, and a wire support member (for example, the embodiment) provided at the tip of the sub-boom to support the erected electric wire. The temporary support member 100), a load detection device for detecting the load applied to the electric power support member (for example, the load detection device 80 in the embodiment), and information on the load detected by the load detection device are first. A transmitter (for example, the transmitter 83 in the embodiment) that transmits power to the control device at the time interval of the above, a battery that supplies power to the transmitter (for example, the battery 85 in the embodiment), and the load by the transmitter. The transmission control device includes a transmission control device (for example, a transmission control device 84 in the embodiment) that controls the transmission of information about the device, and the transmission control device includes a rate of change of the load detected by the load detection device (load per unit time). When the period in which the change amount) is equal to or less than the predetermined value continues for a predetermined time, the transmission interval of the information regarding the load is controlled to the second time interval longer than the first time interval.

In the high-altitude work vehicle having the above configuration, the load detecting device has a vertical load generated when the electric wire is pushed up by the electric wire support member and a horizontal load generated when the electric wire is moved in the horizontal direction. Is detected, and the rate of change of the load is preferably the rate of change of the load in the vertical direction and the load in the horizontal direction, or one of the loads.

Further, in the aerial work platform having any of the above configurations, the transmission control device is detected by the load detection device when the transmission interval of the information regarding the load is the second time interval. When the rate of change of the load exceeds a predetermined value, it is preferable to control the transmission interval to the first time interval.

In the aerial work platform having any of the above configurations, it is preferable to control the transmission interval to the first time interval when the boom is operating.

According to the aerial work platform according to the present invention, when the load applied to the electric wire support member is detected by the load detection device and the period in which the rate of change of the detected load is equal to or less than a predetermined value continues for a predetermined time, The transmission control device controls the transmission interval of the load information by the transmitter to the second time interval, which is longer than the first time interval. As a result, when the load applied to the electric wire support member is stable, the frequency of transmitting information regarding the load by the transmitter is reduced, so that the consumption of the battery that supplies power to the transmitter can be suppressed.

Further, in the high-altitude work vehicle having the above configuration, preferably, the vertical load generated when the load detecting device pushes up the electric wire by the electric wire support member and the horizontal load generated when the electric wire is moved in the horizontal direction. The transmission control device controls the transmission interval of the transmitter according to the rate of change of the vertical and horizontal loads detected by the load detection device, or one of the loads. Thereby, the transmission interval of the transmitter can be controlled according to the vertical or horizontal load applied to the electric wire support member, or the rate of change of the vertical and horizontal load.

Further, in the aerial work platform having any of the above configurations, preferably, the rate of change of the load detected by the load detecting device is a predetermined value when the transmission interval of the information regarding the load is the second time interval. If it exceeds, the transmission control device controls the transmission interval by the transmitter to the first time interval. As a result, if the load fluctuates again after the load applied to the wire support member stabilizes, the load applied to the wire support member in the control device can be increased by increasing the frequency of transmission of information regarding the load. The control for mitigation can be made to respond immediately to changes in load.

Further, in the aerial work platform having any of the above configurations, preferably, when the boom is operating, the transmission control device controls the transmission interval by the transmitter to the first time interval. Thereby, for example, it is possible to cope with the case where the boom is operated and the load applied to the electric wire support member changes suddenly.

It is a side view which shows the appearance of the aerial work platform which concerns on this invention. It is a figure which shows the appearance of the work table and the sub boom device of the aerial work platform, (a) is a side view, (b) is a perspective view. It is a figure which shows the appearance of the temporary support member attached to the sub-boom device of the aerial work platform, (a) shows the state which attached the temporary support member horizontally, and (b) has attached the temporary support member vertically. Indicates the state. It is a functional block diagram of the load detection device and the upper control device of the aerial work platform. It is explanatory drawing for demonstrating the control content of the transmission interval by the transmission control device which the load detection device of the aerial work platform has.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the overall configuration of the aerial work platform according to the present invention will be described with reference to the side view of the aerial work platform shown in FIG. As shown in FIG. 1, the aerial work platform 1 has a driving cab 7 at the front of the vehicle body 2, and is a truck vehicle capable of traveling by a pair of left and right front wheels 5f and rear wheels 5r arranged in front of and behind the vehicle body 2. It is configured based on. The vehicle body 2 is configured to have a vehicle body frame including a chassis frame and a subframe mounted on the chassis frame.

The vehicle body 2 is provided with a pair of left and right front jacks 10f and rear jacks 10r for lifting the vehicle when performing work at a high place using a boom 30 or the like described later. More specifically, as shown in FIG. 1, the front jack 10f is provided near the rear side of the driving cab 7 and the front wheel 5f, and the rear jack 10r is provided at the rear end portion of the vehicle body 2. The front jack 10f and the rear jack 10r are configured to extend downward by driving a jack cylinder 11 provided inside each of them to lift and support the vehicle body 2 to stabilize the vehicle. .. Further, at the rear end portion of the vehicle body 2, a lower operation device 26 provided with an operation lever or the like for operating the jacks 10f, 10r, the boom 30 described later, and the like is provided.

A swivel table 20 configured to be horizontally swiveled by driving a swivel motor 24 is provided at the rear portion of the vehicle body 2 in the mounting region behind the driving cab 7. A boom 30 is attached to a support column 21 extending upward from the swivel table 20 by a foot pin 22 so as to be swingable (undulating) in the vertical direction. A plurality of tool boxes 27 for storing work tools, work equipment, and the like are arranged on the left and right sides of the mounting area of the vehicle body 2.

The boom 30 is configured to be expandable and contractible by nesting a base end boom 30a, an intermediate boom 30b, and a tip boom 30c, which are undulatingly attached to a support column 21 by a foot pin 22. As a result, the boom 30 has a telescopic cylinder 31 provided inside.
The boom 30 can be expanded and contracted in the longitudinal direction by driving the boom 30. Further, the boom 30 is configured to be able to move up and down in the upper and lower surfaces by driving the undulating cylinder 23 straddled between the base end boom 30a and the support column 21. A lower leveling cylinder 25 is further straddled between the base end boom 30a and the support column 21. The lower leveling cylinder 25 is driven when the leveling control of the vertical post 32 described below is performed.

Next, with reference to FIG. 2, various configurations provided at the tip of the tip boom 30c will be described. As shown in FIGS. 2A and 2B, a vertical post 32 is swingably attached to the tip of the tip boom 30c by a swing pin 33 in the vertical direction. The vertical post 32 is always in a vertical posture regardless of the undulation angle of the boom 30 due to the upper leveling cylinder (not shown) straddling the tip of the tip boom 30c and the lower leveling cylinder 25 described above. Swing control (leveling control) is performed so that it is held.

A workbench bracket 38 is attached to the upper part of the vertical post 32 so as to be able to swivel (horizontally swivel) with respect to the vertical post 32, and the upper surface is opened at the side of the workbench bracket 38 via the workbench elevating device 36. A box-shaped workbench 40 is attached. The upper part of the vertical post 32 and the workbench bracket 38 are surrounded by a cover 35. A swing motor 34 is provided inside the cover 35, and by driving the swing motor 34, the workbench bracket 38 and the workbench 40 are provided via a rotation transmission mechanism including a worm gear, a wheel gear, etc. (not shown). It is configured to be able to rotate horizontally (swing operation) around the vertical post 32.

As described above, since the vertical post 32 is leveled and controlled so that the vertical posture is always maintained, the floor surface of the work table 40 is always held horizontally regardless of the undulation angle of the boom 30. There is. The workbench elevating device 36 is configured to have an elevating cylinder (not shown), and is configured to move the workbench 40 up and down with respect to the workbench bracket 38 by driving the elevating cylinder. There is. The workbench 40 is provided with an upper operation device 45 including an operation lever for operating the swivel table 20, the boom 30, and the workbench 40, various operation switches, and the like.

The operating mechanism of the high-altitude work device (the boom 30 and the like described above) provided on the vehicle body 2 receives an operation signal from the lower operation device 26 and the upper operation device 45, and receives an operation signal from the jack cylinder 11, the swivel motor 24, and the telescopic cylinder 31. , The lower control device 28 (see FIG. 1) that controls the lifting cylinder of the undulating cylinder 23, the swing motor 34, the lifting cylinder of the workbench lifting device 36 (hereinafter collectively referred to as “various actuators”), and the various actuators described above. It is composed of a hydraulic unit (not shown) that supplies hydraulic oil for operation, and a mounting unit battery 29 (see FIG. 1) for driving an aerial work device.

The hydraulic unit described above includes a hydraulic pump, a pump drive motor for driving the hydraulic pump, and a control valve for controlling the supply direction and supply amount of hydraulic oil supplied from the hydraulic pump to various actuators. The pump drive motor is rotationally driven by electric power supplied from the frame battery 29 via the inverter. The operation of the control valve is controlled by the lower control device 28, and the operation of the various actuators is controlled by controlling the supply direction and the supply amount of the hydraulic oil supplied to the various actuators.

As shown in FIG. 2A, a sub-boom device 70 is provided at the upper end of the vertical post 32. The sub-boom device 70 includes a swivel body 71 provided at the upper end of the vertical post 32 so as to be able to swivel horizontally, a sub-boom support member 72 mounted vertically swingably on the upper portion of the swivel body 71, and a sub-boom support member 72. It is configured to have a long sub-boom member 74 that is detachably attached to the upper part of the above. The sub-boom member 74 is removed from the sub-boom support member 72, for example, when the aerial work platform 1 is moving, and is fixed to the side surface of the base end boom 30a as shown in FIG.

The swivel body 71 includes a swivel member 71a rotatably attached to the upper end of the vertical post 32, and a cover 71b that covers the swivel member 71a. The swivel member 71a is provided so as to be swivel coaxially with the swivel shaft A of the workbench 40 (workbench bracket 38) by driving a sub-boom swivel motor (not shown) provided inside. A swing pin 72a extending in the horizontal direction is provided on the upper portion of the swing member 71a, and the sub-boom support member 72 is mounted so as to be swingable in the vertical direction around the swing pin 72a.

The sub-boom support member 72 is configured to be swingable around the swing pin 72a with respect to the swing member 71a by driving a swing cylinder (not shown) provided inside the cover 71b of the swing body 71. ing. A sub-boom mounting hole extending in a direction orthogonal to the swing pin 72a is formed in the upper portion of the sub-boom support member 72, and the sub-boom member 74 is inserted into the sub-boom mounting hole and fixed to the sub-boom support member 72 by the fixing pin 77. It is held and the sub-boom member 74 is attached to the sub-boom support member 72. The length of the sub-boom member 74 extending from the sub-boom member 72 toward the workbench 40 in FIG. 2A can be adjusted by changing the insertion position of the fixing pin 77.

At the upper end of the sub-boom support member 72, a winch mechanism 75 for feeding and winding a winch rope (not shown) hung on a sheave member 74a (guide pulley) provided at the tip of the sub-boom member 74 is provided. It is provided. The winch mechanism 75 is configured to drive a built-in winch motor (not shown) to feed and wind the winch rope.

The upper operation device 45 has a workbench operation lever, a winch operation lever, and a boom operation lever, and the upper control device 50 controls the operation of the above-mentioned motor and cylinder according to the operation of these various operation levers. The workbench operation lever includes an elevating lever and a swing lever. The elevating lever is a lever that can be operated in the vertical direction, and the upper control device 50 controls the supply direction and the amount of hydraulic oil to be supplied to the elevating cylinder of the workbench elevating device 36 according to the operating direction of the elevating lever. , Raise or lower the workbench 40. The swing lever is a lever that can be operated in the left-right direction, and the upper control device 50 controls the rotation speed and the rotation direction of the swing motor 34 according to the operation direction of the swing lever, and the workbench 40 is placed on the vertical post 32. Make a horizontal turn around.

The winch operating lever includes a swivel lever, an undulating lever, and a hoisting / hoisting lever. The swivel lever is a lever that can be operated in the left-right direction, and the upper control device 50 controls the rotation speed and the rotation direction of the sub-boom swivel motor provided inside the swivel member 71a according to the operation direction of the swivel lever to swivel. The member 71a is swiveled coaxially with the swivel axis A (see FIG. 4A). The undulating lever is a lever that can be operated in the front-rear direction, and the upper control device 50 determines the supply direction and supply amount of hydraulic oil to be supplied to the swing cylinder provided inside the cover 71b according to the operation direction of the undulation lever. Controlled to swing the sub-boom support member 72 in the vertical direction. The hoisting / hoisting lever is a lever that can be operated in the front-rear direction, and the upper control device 50 controls the rotation direction and rotation speed of the winch motor built in the winch mechanism 75 according to the hoisting / hoisting lever operating direction. , Winch rope (not shown) is unwound or wound up.

The boom operation lever is composed of a 3-axis joystick, and the joystick lever can be operated in 4 directions (front, back, left, and right), and the grip provided at the tip of the lever can be rotated clockwise or counterclockwise. Can be done. The upper control device 50 converts an operation signal corresponding to the operation performed on the boom operation lever into an optical signal and transmits it to the lower control device 28 via an optical fiber. Specifically, when the boom operation lever is operated in the left-right direction, the upper control device 50 transmits an operation signal for expanding and contracting the boom 30 according to the operation direction of the lever to the lower control device 28. As a result, the lower control device 28 controls the supply direction and supply amount of the hydraulic oil supplied to the telescopic cylinder 31 according to the received operation signal, and expands and contracts the boom 30.

Further, when the boom operation lever is operated in the front-rear direction, the upper control device 50 transmits an operation signal for undulating the boom 30 according to the operation direction of the lever to the lower control device 28. As a result, the lower control device 28 controls the supply direction and supply amount of the hydraulic oil supplied to the undulating cylinder 23 according to the received operation signal, and causes the boom 30 to undulate. Further, when the grip of the boom operation lever is rotated, the upper control device 50 transmits an operation signal for turning the swivel base 20 according to the rotation direction of the grip to the lower control device 28. As a result, the lower control device 28 controls the rotation direction and rotation speed of the swivel motor 24 according to the received operation signal to swivel the swivel table 20.

In the sub-boom device 70 configured in this way, the hook provided at the tip of the winch rope of the winch mechanism 75 is hung on a heavy object, and the winch rope is unwound and wound by the winch mechanism 75 to raise and lower the heavy object. It can also be used as a crane device to perform.

Next, the temporary support member 100 in this embodiment will be described with reference to FIG. The temporary support member 100 has a sheave member 74a removed from the tip end portion of the sub-boom member 74 shown in FIG. 2, and is instead attached together with the load detection device 80. The temporary support member 100 includes a plurality of electric wire support portions 110 that temporarily support electric wires erected between utility poles, a support arm 120 (temporary arm tree) to which these electric wire support portions 110 are attached, and a support arm 120 in the horizontal direction or. A load detection device 80 that can be mounted in the vertical direction and detects the horizontal and vertical loads applied to the temporary support member 100, and a bracket 78 for mounting the load detection device 80 on the tip of the sub-boom member 74. Is composed of.

The support arm 120 is a long rod-shaped hollow arm member having a substantially square cross section, and three electric wire support portions 110 are attached at predetermined intervals in the longitudinal direction thereof. The electric wire support portion 110 is provided at a mounting portion 111 attached to the support arm 120 using a tightening bolt, a resin insulator member 112 fixed to the mounting portion 111, and a tip portion of the insulator member 112. It is configured to have a support portion 113. The support portion 113 has four roller members 114 provided so as to face each other vertically and horizontally, and is configured to support by inserting an electric wire through a rectangular gap formed by these four roller members 114. Has been done. Further, the roller member 114 located above the support portion 113 can be swung open and closed, and by swinging and opening the upper roller member 114, the electric wire is inserted into the above-mentioned rectangular gap portion. be able to. Further, by closing the roller member 114 that has been swung open again, the electric wire can be inserted and supported inside the rectangular gap portion described above.

A fixing member 130 for fixing the temporary support member 100 to the load detection device 80 is attached to the support arm 120, and the fixing member 130 is attached to the load detection device 80 according to the arrangement form of the electric wire for temporary support. It is attached to the horizontal fixing portion 80a or the vertical fixing portion 80b of the above. Here, FIG. 3A shows a state in which the fixing member 130 is fixed to the horizontal fixing portion 80a in order to temporarily support the electric wires arranged in the horizontal direction (direction of arrow X). Further, FIG. 3B shows a state in which the fixing member 130 is fixed to the vertical fixing portion 80b in order to temporarily support the electric wires arranged in the vertical direction (direction of arrow Z). Hereinafter, the configuration including the temporary support member 100, the load detection device 80, and the sub-boom device 70 is also referred to as a “temporary support device”.

When the temporary support device configured in this way is used to temporarily support three electric wires vertically erected between utility poles, first, the tip side of the support portion 113 in the three electric wire support portions 110 is used. With the roller member 114 open, the undulation angle and expansion / contraction length of the boom 30 are adjusted. Next, the workbench 40 is moved upward so that the support portion 113 of the wire support member 110 is brought close to the wire, and the wire is inserted into the gap in the support portion 113, so that the operator can perform hot stick (live-line work). Insulation tool) is used to close the roller member 114 on the tip end side of the support portion 113. Then, after removing the electric wires from the utility pole, the boom operation lever of the upper operating device 45 is operated to control the operation of the boom 30, and the temporary support device is slid upward to push up the three electric wires upward. Temporarily support. By temporarily supporting the three electric wires in this way, it is possible to replace the utility poles and replace the insulators and the like provided on the utility poles.

Next, the configuration of the load detecting device 80 will be described with reference to FIG. In the functional block diagram shown in FIG. 4, the horizontal load cell 81x detects a load applied to the temporary support member 110 in the horizontal direction (see arrow X in FIG. 3A). The vertical load cell 81z detects a load applied to the temporary support member 110 in the vertical direction (see arrow Z in FIG. 3B). Here, the horizontal load cell 81x and the vertical load cell 81z in the present embodiment are strain gauges, and output by replacing the change in electrical resistance caused by the load with the change in voltage.

The load calculation controller 82 converts the voltage value corresponding to the load output from the horizontal load cell 81x and the vertical load cell 81z into numerical data representing the load value. Hereinafter, the numerical data representing the load value is referred to as "load data", the numerical data representing the horizontal load value is referred to as "horizontal load data" (the symbol is Fx), and the vertical load value is represented. Numerical data is called "vertical load data" (the symbol is Fz). Then, the load calculation controller 82 outputs the converted horizontal load data and vertical load data to the transmitter 83 and the transmission control device 84, respectively.

The transmitter 83 transmits the horizontal load data and the vertical load data output from the load calculation controller 82 to the upper control device 50 at predetermined time intervals. Further, the transmitter 83 changes the transmission interval of the load data according to the control signal output from the transmission control device 84 described below. The load data transmitted from the transmitter 83 is received by the receiver 52 built in the upper control device 50 and output to the upper controller 51. The upper controller 51 sounds an alarm according to the input load data, and regulates the operation of the boom 30 according to the operation of the boom operating lever of the upper operating device 45. As a method of restricting the operation of the boom 30, for example, when the boom operation lever is operated in the direction in which the load applied to the temporary support device increases, the output to the actuator is not output from the lower control device 28. do.

The transmission control device 84 controls the transmission interval of the horizontal load data and the vertical load data by the transmitter 83 based on the horizontal load data and the vertical load data output from the load calculation controller 82. The battery 85 supplies electric power to the horizontal load cell 81x, the vertical load cell 81z, the load calculation controller 82, the transmitter 83, and the transmission control device 84 described above.

Next, with reference to FIG. 5, the content of control of the transmission interval of the transmitter 83 by the transmission control device 84 will be described. FIG. 5 shows the control content of the transmission interval of the transmitter 83 based on the vertical load data in the transmission control device 84. In this figure, assuming that the time when the temporary support work of the electric wire is started by the aerial work platform of the present embodiment is t0, first, in the transmission control device 84, the transmission interval of the load data transmitted by the transmitter 83 is 0. . Control to 1 second. At this stage, the load by the electric wire is not applied to the temporary support device, and the transmitter 83 transmits, for example, horizontal load data Fx1 (not shown) and vertical load data Fz1 corresponding to the own weight of the temporary support member 100. It shall be done.

When the boom 30 is operated and controlled to push the temporary support device upward in a state where the temporary support electric wire is inserted into the rectangular gap portion in the support portion 113 of the electric wire support member 110, a vertical load is correspondingly obtained. Since the value of the data Fz gradually increases, the rate of change of the vertical load data Fz exceeds 0. Then, when t1 seconds have elapsed from the start of the temporary support work, the temporary support of the electric wire is completed, the value of the vertical load data Fz stabilizes at Fz2, and the rate of change of the vertical load data Fz is equal to or less than the predetermined value ( For example, when it becomes 0 (zero), the transmission control device 84 starts timing the predetermined time T. When the rate of change of the vertical load data Fz continues to be kept below the predetermined value during the timing of the predetermined time T, the transmission control device 84 determines the load data transmitted by the transmitter 83 when the predetermined time T elapses. The transmission interval is controlled to be 1 second.

Here, once the temporary support of the electric wire is completed, the boom 30 and the like maintain the same posture, so that the load detected by the horizontal load cell 81x and the vertical load cell 81z does not usually change. Therefore, in such a state where the load applied to the temporary support device is stable, it can be said that even if the transmission interval of the load data transmitted from the transmitter 83 is lengthened, the effect on safety is small, and the effect on safety is small. By lengthening the transmission interval, the power consumption of the transmitter 83 can be suppressed. In addition, when the rate of change of the vertical load data Fz becomes equal to or less than the predetermined value, the transmission interval is not immediately lengthened, and the initial transmission interval is maintained until the predetermined time T elapses. Although the load applied to the support device is temporarily stable, the load data can be transmitted with good response even if the load changes to fluctuation in a short time because it is not sufficiently stable. ..

In a state where the load applied to the temporary support device is sufficiently stable and the transmission interval of the load data transmitted from the transmitter 83 is 1 second, for example, time t2 has elapsed since the temporary support work was started. Occasionally, it is assumed that the load applied to the temporary support device increases for some reason. As a result, when the rate of change of the vertical load data Fz output from the load calculation controller 82 exceeds a predetermined value, the transmission control device 84 controls the transmission interval of the transmitter 83 to be 0.1 seconds again.

Then, when the value of the vertical load data Fz becomes Fz3 at time t3, for example, the upper controller 51 generates an alarm, and the worker who has received this alarm and is on the workbench 40 is the upper operation device 45. It is assumed that the load applied to the temporary support device is reduced by operating the boom operation lever to lower the temporary support device and the workbench 40. As a result, when the value of the vertical load data Fz becomes Fz2 again at time t4, assuming that the rate of change of the vertical load data Fz becomes equal to or less than a predetermined value (for example, 0 (zero)), the transmission control device 84 determines. Start timing the time T. Then, when the rate of change of the vertical load data Fz continues to be kept below the predetermined value during the time measurement of the predetermined time T, when the predetermined time T elapses, the load data by the transmitter 83 is transmitted by the transmission control device 84. The transmission interval is controlled to be 1 second.

In this way, when the load applied to the temporary support device is stable and the load changes (more specifically, the rate of change of the load exceeds a predetermined value), the applied load is changed. By shortening the transmission interval of the transmitter 83 regardless of the increase or decrease, for example, in the upper controller 51, processing such as generation of an alarm and regulation of boom operation can be performed with good response to a change in load.

In the above-described embodiment, the rate of change of the load when the transmission interval is changed from the short state to the long state and the rate of change of the load when the transmission interval is changed from the long state to the short state are different. May be good. Further, when the state in which the rate of change of the load was equal to or less than the predetermined value was maintained for the predetermined time T, the transmission interval was changed from the short state to the long state, but instead of increasing the transmission interval. , The transmission of the load data itself may be stopped. In this case, if the rate of change of the load exceeds a predetermined value while the transmission of the load data is stopped, the transmission of the load data may be restarted. Further, when the rate of change of the load becomes equal to or less than a predetermined value, the transmission interval may be changed from a long state to a short state without waiting for the state to be maintained for a predetermined time T.

Further, when the constants RC1 and RC2 (RC1> RC2) are set in advance as the value of the rate of change of the load and the value of the rate of change of the detected load becomes RC1 or less in a state where the transmission interval is short, The transmission interval may be lengthened, and transmission may be stopped when the value of the rate of change of the load detected in that state becomes RC2 or less. Further, in the above-described embodiment, an example of controlling the transmission interval of the transmitter 83 based on the vertical load data is shown, but instead of the vertical load data, the transmission interval of the transmitter 83 is controlled based on the horizontal load data. Alternatively, the transmission interval of the transmitter 83 may be controlled based on both the vertical load data and the horizontal load data.

Further, in the above-described embodiment, the load detection device 80 is provided with the transmission control device 84, and the transmission interval of the transmitter 83 is controlled in the load detection device 80. For example, the transmission interval of the transmitter 83 is controlled by the upper controller 51. A control signal for controlling the above is generated, transmitted from the upper control device 50 to the load detection device 80, and the transmission interval of the transmitter 83 is switched according to the control signal received from the upper control device 50 in the load detection device 80. good. In this case, the upper controller 51 not only generates a control signal for controlling the transmission interval based on the load data received by the receiver 52, but also, for example, whether or not the boom operation lever of the upper operation device 45 is operated. Depending on the situation, a control signal for controlling the transmission interval may be generated. Specifically, when the boom operating lever of the upper operating device 45 is operated, a control signal that shortens the transmission interval of the transmitter 83 is generated regardless of whether or not the value of the load data is changed. You may.

Further, as another method of controlling the transmission interval of the transmitter 83 from the upper controller 51, for example, a load data transmission request signal is transmitted from the upper controller 51 to the load detection device 80, and the load detection device 80 described above. When the transmission request signal is received, the load data may be transmitted from the transmitter 83. In this case, the transmission interval of the transmitter 83 can be controlled by changing the transmission interval of the transmission request signal described above in the upper controller 51.

Although the embodiments according to the present invention have been described above, the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the configuration in which the support arm 120 is provided with the three electric wire support portions 110 has been described, but the configuration is such that two electric wire support portions 110 or four or more electric wire support portions 110 are provided. You may.

1 High-altitude work vehicle 2 Body 20 Swing table 28 Lower control device 30 Boom 40 Work table 45 Upper operation device 50 Upper control device 70 Sub boom device 80 Load detection device 81x Horizontal load cell 81z Vertical load cell 82 Load calculation controller 83 Transmitter 84 Transmission controller 85 Battery 100 Temporary support member

Claims (4)

The boom provided on the car body so that it can be undulated,
A control device that controls the operation of the boom, and
A workbench provided at the tip of the boom so as to be rotatable on a horizontal plane,
A sub-boom provided at the tip of the boom so that it can turn and undulate,
An electric wire support member provided at the tip of the sub-boom and supporting the erected electric wire, and
A load detection device that detects the load applied to the wire support member, and
A transmitter that transmits information about the load detected by the load detection device to the control device at a first time interval, and a transmitter.
A battery that supplies power to the transmitter and
A transmission control device for controlling the transmission of information regarding the load by the transmitter is provided.
In the transmission control device, when the period in which the rate of change of the load detected by the load detection device is equal to or less than a predetermined value continues for a predetermined time, the transmission interval of the information regarding the load is longer than the first time interval. An aerial work platform characterized by being controlled at a second time interval. The load detecting device detects the vertical load generated when the electric wire is pushed up and the horizontal load generated when the electric wire is moved horizontally by the electric wire support member.
The aerial work platform according to claim 1, wherein the rate of change of the load is the rate of change of the vertical and horizontal loads, or one of the loads. The transmission control device transmits the load when the rate of change of the load detected by the load detection device exceeds a predetermined value when the transmission interval of the information regarding the load is the second time interval. The aerial work platform according to claim 1 or 2, wherein the interval is controlled to the first time interval. The aerial work platform according to any one of claims 1 to 3, wherein the transmission control device controls the transmission interval to the first time interval when the boom is operating.

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