JP5123534B2 - Jib crane control system - Google Patents

Description

  The present invention relates to a control system for a jib crane having a long boom that is placed in a predetermined place.

  2. Description of the Related Art Conventionally, when a plurality of jib cranes are installed adjacent to each other so that the operation ranges of the booms overlap, a control device for the jib crane that regulates the operation ranges so that the booms do not contact each other is known (Patent Document 1). , 2 etc.).

  These control devices project the operating range of the boom onto the plan view, and control the booms so as not to overlap each other on the plan view at the same time.

  On the other hand, when a jib crane is placed in a location close to a railway or road, if the suspended load is lifted very high, the feeling of pressure given to the driver increases even in areas where there is no hindrance to traveling such as the railway. It also becomes a factor of decelerating the traveling vehicle unconsciously.

In addition, when a jib crane is placed on the rooftop of a mid-to-high-rise building, if a suspended load is dropped onto a ground road during times when people and cars are busy during the day, people passing by the road and adjacent There is a risk that it will enter the field of view of people using the building and give a sense of pressure even when working in a safe area.
JP-A-7-300295 JP 60-48894 A

  However, if the operating range on the plane of the jib crane and the lifting height of the hook are always regulated, the working efficiency is lowered and the construction period is extended.

  In particular, in railways, trains do not travel from the last train to the first train, but in the control devices disclosed in Patent Documents 1 and 2, etc., control is performed only by the positional relationship with the adjacent jib crane. Therefore, the control cannot be changed even if the site situation or time changes.

  In addition, if the jib crane hooks on the roofs of medium- and high-rise buildings are restricted so that they cannot always be lowered to the road, it will not be possible to carry in materials, etc., so this is not realistic. There is.

  Therefore, the present invention can ensure both workability and safety by switching the operating range in response to changes in site conditions, date, day of the week, time, weather conditions, etc. The object is to provide a control system for a jib crane capable of three-dimensional control by switching height regulation.

  In order to achieve the above object, a control system for a jib crane according to the present invention is a control system for a jib crane that regulates the operating range of a stationary jib crane, and measures for calculating the boom position and hook height of the jib crane. Means, computing means for computing the output from the measuring means, storage means for storing a plurality of restriction patterns for restricting the operating range of the boom position in plan view and the hook height, and switching for switching the restriction patterns And a display means for displaying at least the boom position on a plan view as a calculation result by the calculation means, and a result of comparing the restriction pattern set by the switching means with the boom position and the hook height. And a notifying means.

  Here, a plurality of the jib cranes are arranged at intervals, and each calculation means calculates the boom position and the hook height from the output from the measurement means installed in each jib crane, and the calculation result is a communication means. The information can be transmitted and displayed on the display means installed in the monitoring room, and the notification by the notification means can be performed.

  Further, the communication state of the communication means can be displayed on the display means.

  Furthermore, a call means for making a call between the operator of the jib crane and the monitor of the display means can be provided.

  In the jib crane control system of the present invention configured as described above, the storage means stores a plurality of restriction patterns for restricting the operation range and the hook height of the boom position in plan view, and the restriction means displays the restriction patterns. Can be switched.

  For this reason, workability can be changed by changing the regulation pattern that regulates the operating range of the jib crane on an as-needed basis, based on site conditions such as whether the train is operating, time such as daytime or midnight, and weather conditions. Both safety and safety can be ensured.

  In addition to grasping not only the position of the boom on the plane but also the vertical movement of the hook height, three-dimensional control becomes possible. As a result, even when the jib crane is operated near the track or road, it is possible to perform control without intimidating the driver of the traveling vehicle.

  Further, when a plurality of jib cranes are used, the operation of the entire jib crane can be monitored by the display means and the notification means in the monitoring room connected to each jib crane by communication means.

  For this reason, since the crane operation is watched over by the supervisor in addition to the operator of the jib crane, the safety is further improved.

  Also, by displaying the communication status of the communication means on the display means placed in the monitoring room, the monitor can immediately recognize when the communication status deteriorates due to the influence of external noise or disconnection. It is possible to take immediate measures such as resetting the system.

  Furthermore, by providing a call means for making a call between the operator of the jib crane and the supervisor, it is possible to easily confirm each other's recognition of the current situation.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory diagram illustrating a plan view of a state in which the tower cranes 5 </ b> A to 5 </ b> C serving as three jib cranes are controlled by the side of the track 6 by applying the jib crane control system 1 of the present embodiment.

  First, a schematic configuration of the tower crane 5 will be described with reference to FIG.

  This tower crane 5 is a climbing type jib crane that is placed on a mast 55 erected on a pile 56 that is driven into the ground, and a revolving frame 58 is attached to the upper end of the mast 55 that is added to a desired height. It is done.

  The swivel frame 58 is a frame that rotates about the mast 55 as an axis. An operator room 57 is provided, and the base of the boom 51 is attached to be freely rotatable in the undulation direction.

  That is, the boom 51 is attached to the turning frame 58 so that the tip thereof moves up and down. A wire rope 53 for hanging a suspended load hangs from the tip, and a hook 52 is attached to the tip of the wire rope 53. ing.

  Further, an over-winding prevention device 54 is attached to the tip of the boom 51. When the hook 52 is wound up and reaches the upper limit, the limit switch is activated and the winding operation is stopped.

  Furthermore, although not shown, the tower crane 5 is equipped with various safety devices such as an over-winding prevention device, a fast-winding / slow-winding detection device, a undulation limiting device, an overload prevention device, and a hydraulic lifting safety device.

  The control system 1 of the present embodiment is a system that can monitor the operation of the tower crane 5 in a monitoring room 71 such as a work office, and a schematic block diagram thereof is shown in FIG.

  The control system 1 includes crane-side systems 2... Provided in the tower cranes 5A to 5C, a monitoring system 3 provided in the monitoring room 71, communication control units 27 and 36 as communication means connecting them, and It is mainly comprised from the communication cable 36a.

  The crane-side system 2 includes a turning angle detector 21a, a undulation angle detector 21b, and a hoisting detector 21c as measuring means.

  The turning angle detector 21a includes an absolute rotary encoder, an incremental encoder, an optical fiber gyro, and the like, and is attached to a turning frame 58 as shown in FIG.

  Further, the undulation angle detector 21b includes a pendulum type potentiometer, a moment limiter monitor output terminal, and the like, and is attached to the base of the boom 51 as shown in FIG.

  Further, the hoisting detector 21c is composed of a multi-rotation potentiometer or the like, and is attached to the hoisting device 59 of the wire rope 53 as shown in FIG.

  And the output detected by these measurement means is transmitted to the crane side control part 23 as a calculation means at the side of a crane.

  The crane-side control unit 23 is connected to a storage unit 24 as a storage unit, a monitor 25 as a display unit and a notification unit for an operator, and a speaker 26 as a notification unit for an operator.

  The crane-side control unit 23 calculates the position of the tip of the boom 51 as the boom position and the position of the hook 52 as the hook height based on the outputs of the measuring means.

  That is, the tip position of the boom 51 is calculated from the rotation angle of the turning frame 58 output from the turning angle detector 21a, the tilt angle of the boom 51 output from the undulation angle detector 21b, and the boom 51 length. Can do.

  Further, the position of the hook 52 is calculated from the winding length of the wire rope 53 output from the hoisting detector 21c, the output of the undulation angle detector 21b, the height of the tower crane 5, and the boom 51 length. Can do.

  Further, the storage unit 24 stores a plurality of restriction patterns, which will be described later, and compares the set restriction pattern at that time with the boom position and hook position, and stops when an emergency stop is necessary. A signal is transmitted to the relay box 22, and the operation of the tower crane 5 to be stopped automatically stops.

  The boom position and the hook height, which are the calculation results of the crane-side control unit 23, are sent from the communication control unit 27 such as a communication modem to the communication control unit 36 on the monitoring system 3 side through the communication cable 36a. This communication is also performed from the crane-side systems 2 and 2 provided in the other two tower cranes 5B and 5C.

  The monitoring side system 3 includes a monitoring side control unit 31 as a calculation unit, a regulation changeover switch 32 as a switching unit for switching a plurality of regulation patterns, a storage unit 33 as a storage unit for storing regulation patterns, and a display unit. And a monitor 34 as notification means and a speaker 35 as notification means.

  The storage unit 33 is configured by a storage medium such as a hard disk, a CD-ROM, a DVD-ROM, or a flash memory, in which data of a plurality of types of restriction patterns is written in advance.

  For example, when work is performed using the tower crane 5 at the work site 7 next to the track 6, the train between the train and the first train after the last train is called “Train A” when the train travels on the track 6. The restriction range in which the hook 52 of the tower crane 5 should not enter is different from “B when the track is closed” that does not travel.

  That is, in “train operation A”, the tip of the boom 51, in other words, the hook 52 must be prevented from entering the sky over the track 6, so that in addition to obstacles such as buildings as shown in FIG. Thus, a restriction pattern in which the sky over the track 6 is also restricted is created as data.

  In addition, since “when the track is closed B”, there is no problem even if the hook 52 enters the sky above the track 6, so that the work efficiency is improved or the work is performed in a place where the work cannot be performed during the “train operation A”. In order to do this, a restriction pattern with a narrower restriction range than “train operation time A” is created as data.

  Such restriction pattern data is created by inputting coordinate values on a plan view using an input means such as a keyboard or a mouse.

  Furthermore, even if the hook height is far away from the top of the track 6 in a plan view, if the hook 52 is wound up so high that the suspended load is at a high position, the driver of the train approaching from a distance feels tight. Therefore, as shown in FIG. 5, “train operation time A” is regulated so that the hook 52 is not wound up beyond a predetermined height (hook regulation height).

  That is, until the hoisting length of the wire rope 53 reaches the upper limit, in other words, even if the hoisting height is sufficient until the overwinding prevention device 54 operates, the set hook regulation height is exceeded. The operating range in the vertical direction can be controlled so as not to occur.

  As described above, in the present embodiment, two types of restriction patterns of “train operation time A” and “track closing time B” are created and stored in the storage unit 33 and the storage unit 24.

  As shown in FIG. 1, the restriction changeover switch 32 that changes the restriction pattern is a button type that can reliably switch between “train operation time A” and “track closing time B”. Here, the numbers 1 to 3 of the restriction changeover switch 32 indicate Units 1 to 3, and “A” and “B” indicate “A train operation time A” and “Rail track closing time B”.

  Thus, since the switching button of the regulation changeover switch 32 is provided separately for each of the tower cranes 5A to 5C, it is possible to freely switch at one time or switch at a different timing.

  Moreover, by providing the changeover switch 32 only on the monitoring room 71 side, it is possible to prevent the restriction pattern from being switched due to an erroneous operation or the like on the tower cranes 5A to 5C side.

  For example, when switching the restriction pattern from “when train is operating A” to “when track is closed B”, the supervisor monitors the trainer after receiving a notification that the train operation has been confirmed. Switching is performed by operating the restriction changeover switch 32 in the chamber 71, and the operator of each of the tower cranes 5A to 5C is notified by the communication devices 41 and 42 that the restriction pattern has been changed.

  Further, as shown in FIG. 6, the monitor 34 of the monitoring room 71 displays a current state display unit 34 a that displays a state in which the tower cranes 5 </ b> A to 5 </ b> C are viewed in a plan view, and a restriction pattern set at that time. The restriction pattern display unit 34b, the communication state display unit 34c that displays the communication state between the communication control units 27 and 36, and the legend display unit 34d are mainly output on the screen.

  The current status display section 34a is a display means for displaying the plan view of the railway 6, the work site 7, the office as the monitoring room 71, and the like, and displaying the positions of the booms 51 of the tower cranes 5A to 5C in operation. It is.

  Moreover, the present condition display part 34a is also an alerting | reporting means which shows the condition of the boom position and hook height of tower cranes 5A-5C. That is, when the boom position is within the operating range, the crane and the circle having the radius of the boom are displayed as a “safe area” with a solid line (green when displayed in color).

  In addition, when the distance between the boom position and the boundary of the restriction range, or the distance between the hook height and the boundary of the hook restriction height is equal to or less than a predetermined value, a circle having a radius of the crane and its boom as a “warning area” Is displayed with a one-dot chain line (yellow for color display).

  Furthermore, when the boom position or hook height exceeds the restriction range or hook restriction height in plan view, a circle with a radius of the crane and its boom as a “stop area” is indicated by a two-dot chain line (when displaying in color) Displayed in red).

  Here, in the case of “warning area” and “stop area”, not only the screen output of the monitor 34 is notified, but also “similar to the structure”, “is a stop area”, “height” from the speaker 35 Sound output notification such as “Caution” is performed. Note that the hook height notification means may be only the sound output of the speaker 35.

  The numbers 1 to 3 in the communication status display part 34c represent the numbers of the tower cranes 5A to 5C, and the communication status can be determined by the color of the numbers. For example, when the communication state is good, the number is displayed in green, and when the communication state deteriorates due to external noise or disconnection of the communication cable 36a, the number is displayed in red to alert the monitor. In addition, a voice “communication state deterioration” may be output from the speaker 35.

  When the communication state deteriorates in this way, the monitoring system 3 is reset by the reset device 37, and the reset device 28 of the crane side system 2 is operated by a route different from the communication cable 36a such as a radio to connect the crane side system 2. Also reset. This reset can be performed periodically by a timer.

  Note that such notification by the display means and the notification means is also performed on the monitor 25 and the speaker 26 of the crane-side system 2.

  In addition, communication devices 41 and 42 such as transceivers of wireless communication devices are provided as communication means so that a call can be made between a monitor watching the monitor 34 of the monitoring system 3 and an operator of the tower crane 5. It is installed on the system 2 and 3 side.

  By using the communication devices 41 and 42, before switching the regulation changeover switch 32 or resetting the system, the supervisor contacts the operator, or the tower cranes 5A to 5C are connected between the supervisor and the operator. It is easy to confirm recognition about the operating status.

  Moreover, in the control system 1 of this embodiment, in order to avoid not only the control by the above-mentioned restriction pattern but contact between the adjacent tower cranes 5A to 5C, the mutual projections 51, that is, the booms 51, When the leading end of 51 approaches a predetermined distance or less, the operator 25 and the monitor 26 and 35 notify the operator and the monitor as a “warning area”, and when further approached, a “stop area”.

  Further, the wind speed is constantly observed by an anemometer attached to the tower crane 5, and if the observed wind speed exceeds a predetermined value or the suspended load is not stable, a notification is given to immediately stop the work by the tower crane 5. . Further, the operation by the tower crane 5 can be stopped due to heavy rain, earthquake, heavy fog, or the like.

  Next, the operation of the control system 1 of the present embodiment will be described.

  In the control system 1 of the tower crane 5 according to the present embodiment configured as described above, a plurality of restriction patterns for restricting the operation range and the hook height of the boom position in plan view are stored in the storage units 24 and 33. The restriction pattern can be switched by the restriction changeover switch 32.

  For this reason, on the basis of on-site conditions such as whether or not the train is operating and time such as daytime or midnight, the regulation pattern that regulates the operating range of the tower crane 5 is switched to the flexible case to improve workability. Both safety can be ensured.

  In addition to grasping not only the position of the boom 51 on the plane but also the vertical movement of the hook 52, three-dimensional control is possible. As a result, even when the tower crane 5 is operated near the track 6 or the road, it is possible to perform control without intimidating the driver of the traveling vehicle.

  Further, when a plurality of tower cranes 5A to 5C are used, the towers 5A to 5C and the monitor 34 and the speaker 35 of the monitoring room connected by the communication control units 27 and 36 and the communication cable 36a, the entire tower crane The operation of the cranes 5A to 5C can be monitored.

  For this reason, in addition to each operator of the tower cranes 5A to 5C, the crane operation is watched over by the supervisor, so the safety is further improved.

  In addition, by displaying the communication status of the communication means on the monitor 34 placed in the monitoring room, when the communication status deteriorates due to the influence of external noise or disconnection, the monitor can immediately recognize. Yes, it can be dealt with quickly, such as resetting the system.

  Furthermore, by providing the communication devices 41 and 42 for making a call between the operator of the tower crane 5 and the supervisor, it is possible to easily confirm each other's recognition of the current work state and the field situation.

  Hereinafter, Example 1 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the first embodiment, a switching control unit that automatically switches according to time and day of the week is used as a switching unit that switches a plurality of restriction patterns.

  This switching control unit uses a plurality of diamonds and restriction patterns (A pattern, B pattern, C pattern) based on the diamonds as shown in FIG.

  In other words, the A pattern determines a time zone for performing the restriction at the time of “line closing” based on the last train time of the up line of the A diagram and the start time of the down line. Further, the B pattern determines a time zone in which the “time when the track is closed” is regulated based on the last train time of the downlink of the B diagram and the start time of the downlink. And in the C pattern, since the down line is operating all day, regulation at the time of “track closing” is not performed.

  On the other hand, as shown in FIG. 7B, the storage unit 33 stores a table associating the day of the week with the above three patterns.

  Then, the switching control unit detects the day of the week and the time in real time, reads data matching the same from the storage unit 33, and selects a restriction pattern.

  For example, if it is 2:00 on Monday, select the “pattern closed” regulation for A pattern, if it is 1:00 on Wednesday, select the “train operation” regulation for B pattern on Sunday at 3:00. For example, the restriction pattern is switched according to the day of the week and the time, such as selecting a restriction on “train operation”.

  In this way, if the switching of the restriction pattern is automatically performed by the switching control unit, it is possible to save labor, and it is possible to surely switch without forgetting to switch.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, Example 2 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the second embodiment, as shown in FIG. 8, a low floor jib crane 8 placed on the roof of a building 91 will be described.

  The low floor jib crane 8 is a jib crane used for building work of the building 91 and the like.

  In the second embodiment, as shown in FIG. 8, there is a road 92 in front of the building 91, and a building 93 is also built on the opposite side of the road 92.

  When working using the low floor jib crane 8 in such a situation, if the hook 81 is lowered below the “daytime” operating range shown in FIG. There is a risk that a suspended load enters the field of view of the person working in the building 93 and gives a feeling of pressure.

  On the other hand, at night, traffic of cars decreases and people working in the building 93 also go home, so the hook 81 of the low floor jib crane 8 is lowered to the position of the road 92 in order to carry in or out materials. But there is not much influence.

  Therefore, in “daytime”, the operating range is determined and set as a regulation pattern so that the hook 81 does not fall below the roof of the building 91, and the hook 81 can be lowered to the road 92 in the “nighttime” regulation pattern. Set the operating range to.

  That is, in the above-described embodiment, the hook height is restricted so as not to exceed a predetermined value during “train operation”. Regulate.

  Thus, by switching the regulation pattern between “daytime” and “nighttime”, both safety and workability can be ensured.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, Example 3 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the third embodiment, as shown in FIG. 9, a tower crane 5 placed on a road 92 between a building 91 and an elevated road 94 will be described. That is, the tower crane 5 is installed in a work zone surrounded by the fences 95 and 95 of the road 92.

  And in this Example 3, as shown in FIG. 9, the elevated road 94 is extended in parallel with the road 92, and vehicles can pass through part of the road 92 and the elevated road 94 even during construction. It is like that.

  When working using the tower crane 5 in such a situation, if the hook 52 is raised above the operation range of “daytime (for example, 6:00 to 22:00)” shown in FIG. There is a risk that a suspended load may enter the field of view of a driver of a car traveling on the elevated road 94 or a person working in the building 91 and give a feeling of pressure.

  On the other hand, if it is “nighttime (for example, 22:00 to 6:00)”, the traffic volume of the vehicles on the elevated road 94 and the road 92 will decrease, and the people working in the building 91 will also return home. Even if the hook 52 of the tower crane 5 is raised to the position of the elevated road 94 for unloading, there is not much influence.

  Therefore, in “daytime”, the operating range is determined and set as a restriction pattern so that the hook 52 does not rise above the handrail of the elevated road 94, and the hook 52 is raised above the elevated road 94 in the “nighttime” restriction pattern. Set the operating range so that you can.

  By switching the regulation pattern between “daytime” and “nighttime” in this way, it becomes possible to carry in and out materials from the elevated road 94 at “nighttime” when the operating range is widened. Both sexes can be ensured.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, although the case where a plurality of tower cranes 5 </ b> A to 5 </ b> C are used has been described in the above embodiment, the present invention is not limited to this, and the present invention can be applied to control of one tower crane 5. In this case, it is also possible to complete the system in the tower crane 5 such that the crane-side control unit 23 shown in FIG. 2 serves as computing means, the monitor 25 serves as display means, and the speaker 26 serves as notification means. In addition, a monitoring system 3 can be provided separately.

  Moreover, in the said embodiment, although the supervisor switched the regulation pattern manually by pressing the regulation changeover switch 32, it is not limited to this, It switches by time or a timer like Example 1. FIG. You may do it. Moreover, you may make it switch on a weekday and a holiday. Furthermore, the restriction pattern may be switched depending on the brightness detected by the optical sensor or the value of the anemometer.

  Further, in the above embodiment, the case where the construction is performed on the side of the track 6 has been described. However, the present invention is not limited to this, and the construction is performed on the rooftop of the building or on the side of the roadway as in the second or third embodiment. In addition, by applying the present invention, it is possible to switch the regulation pattern between a time zone with a high traffic volume during the daytime and a time zone with a low traffic volume at night, and the suspended load lifted to the driver of the car. By doing so, it is possible to perform control without giving anxiety.

It is explanatory drawing which showed schematic structure of the control system of the tower crane of the best embodiment of this invention. It is the block diagram which showed the structure of the control system of the best embodiment of this invention. It is a side view explaining the structure of a tower crane. (A) is the top view which showed the control range input as a control pattern at the time of train operation, (b) is the top view which showed the control range input as a control pattern at the time of a track closure. It is the side view which showed the hook control height of the tower crane at the time of train operation. It is a figure explaining the display screen of the monitor of a monitoring room, Comprising: (a) is a display screen at the time of train operation, (b) is a display screen at the time of a track closure. It is a figure which shows the restriction | limiting pattern of Example 1, Comprising: (a) is the figure which showed the switching time of several patterns and each pattern, (b) is the figure which showed the relationship between a day of the week and a restriction | limiting pattern. It is the side view which showed the operating range of the hook of the low floor jib crane of Example 2. FIG. It is the side view which showed the operating range of the hook of the tower crane of Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control system 2 Crane side system 21a Turning angle detector (measuring means)
21b Relief angle detector (measuring means)
21c Hoisting detector (measuring means)
23 Crane-side control unit (calculation means)
24 storage unit (storage means)
27 Communication control unit (communication means)
28 reset device 3 monitoring system 31 monitoring side control unit (calculation means)
32 Regulation switch (switching means)
33 Storage section (storage means)
34 Monitor (display means, notification means)
35 Speaker (notification means)
36 Communication control unit (communication means)
36a Communication cable (communication means)
37 Reset device 41, 42 Call device (call means)
5,5A-5C Tower crane (jib crane)
51 Boom 52 Hook 8 Low floor jib crane (jib crane)
81 hook

Claims (4)

A control system for a jib crane that regulates the operating range of a stationary jib crane,
Measuring means for calculating the boom position and hook height of the jib crane, calculating means for calculating an output from the measuring means, a plurality of operating ranges in a plan view of the boom position and a plurality of hook heights are regulated. Storage means for storing a restriction pattern, switching means for switching the restriction pattern, display means for displaying at least the boom position on a plan view as a calculation result by the calculation means, and the restriction pattern set by the switching means And a notifying means for notifying a result of comparing the boom position and the hook height ,
The control system for a jib crane, wherein the switching means automatically switches the restriction pattern according to time .   A plurality of the jib cranes are arranged at intervals, and each calculation means calculates the boom position and the hook height from the output from the measurement means installed in each jib crane, and transmits the calculation results by the communication means. 2. The jib crane control system according to claim 1, wherein the jib crane control system is configured to display on the display unit installed in a monitoring room and to perform notification by the notification unit.   The jib crane control system according to claim 2, wherein the communication state of the communication means is displayed on the display means.   The control system for a jib crane according to any one of claims 1 to 3, further comprising a call means for making a call between an operator of the jib crane and a monitor of the display means.

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