Patent Publication Number: US-2022234867-A1

Title: Movable range display system and crane equipped with movable range display system

Description:
TECHNICAL FIELD 
     The present invention relates to a movable range display system and a crane equipped with the movable range display system. 
     BACKGROUND ART 
     Conventionally, in a mobile crane, an upper slewing table is provided on a lower travelling body capable of self-travelling, and a boom that expands and contracts is provided on the slewing table so as to be freely raised and lowered. The mobile crane can lift a load at a work site, move the load to a position where the load can be conveyed to a destination, and perform a conveyance work in such a mobile crane, the weight of the load that can be conveyed varies depending on a boom length, a raising-lowering angle of the boom, and a slewing position of an upper slewing body with respect to the lower travelling body. That is, in the mobile crane, a rated work radius is determined according to the weight of each load to be conveyed. Accordingly, a movable range display device of a mobile crane that displays the rated work radius corresponding to the weight of a load to be conveyed for each slewing position is known. For example, it is as in Patent Literature 1. 
     The movable range display device of the mobile crane described in Patent Literature 1 is connected to a boom length detection means, a boom angle detection means, a slewing position detection means, and a load detection means. In the movable range display device of the mobile crane, a control unit calculates an actual load and a limit work radius for each slewing angle based on information detected by these detection means, and displays, on polar coordinates, the limit work radius for each slewing angle with the calculated actual load. Further, the movable range display device of the mobile crane is configured to display an actual work radius value while overlaying the actual work radius value on an actual slewing angle corresponding position on the polar coordinates. Since the movable range display device of the mobile crane having the above configuration illustrates the movable range of the boom and the current position of the boom according to the weight of the load to be conveyed, an operation such as raising, lowering, expansion, contraction, and slewing of the boom can be easily performed within the movable range. 
     The movable range display device of the mobile crane configured as described above illustrates a range in which the mobile crane can carry a load without falling over. However, in an actual work site, a structure (feature) or the like may exist within the movable range of the mobile crane. That is, with the mobile crane, even when a lifting position and a suspending position of the load are within the movable range, there occurs a range in which the conveyance is not possible due to interference with the structure or the like when the structure or the like is present. However, in the movable range display device of the mobile crane described in Patent Literature 1, the user who uses the movable range display device cannot determine whether the load can be conveyed to a destination without interfering with the structure or the like at the current arrangement position of the mobile crane because the situation of a surrounding structure and the like is not reflected on the movable range. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: JP 7-89697 A 
       
    
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     An object of the present invention is to provide a crane including a movable range display system movable range display system that enables a user to determine whether a load can be conveyed to a destination without interfering with a feature or the like in a work site. 
     Solutions to Problems 
     The problem to be solved by the present invention is as described above, and a solution to solve the problem will be described below. 
     That is, the present invention is a movable range display system including a first acquisition unit that acquires three-dimensional information of a work site, a second acquisition unit that acquires an operating condition of a crane in which a boom is provided in a travelling body and a weight of a load carried by the crane, a third acquisition unit that acquires an arrangement position and an arrangement direction of the travelling body at the work site, a calculation unit that calculates a movable range of the crane in the arrangement position and the arrangement direction of the travelling body on the basis of the three-dimensional information of the work site, the operating condition, and the weight of the load, and a display unit that displays an image indicating the work site, an image indicating the mobile crane, and the movable range in an overlaid manner. 
     Effects of the Invention 
     The present invention has the following effects. 
     In the present invention, a user can determine whether a load can be conveyed to a destination without interfering with a feature or the like in a work site. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a side view illustrating an overall configuration of a crane. 
         FIG. 2  is a block diagram illustrating a control configuration of the crane. 
         FIG. 3  is a block diagram illustrating a control configuration of a movable range display system. 
         FIGS. 4A and 4B  illustrate a display mode of a movable range.  FIG. 4A  illustrates a top view image of the movable range, and  FIG. 4B  illustrates a cross-sectional view image of the movable range along an axial direction of the boom. 
         FIGS. 5A and 5B  illustrate conditions for calculating the movable range in consideration of a feature.  FIG. 5A  illustrates an interference range of a top view image of the crane, and  FIG. 5B  illustrates an interference range of a cross-sectional view image. 
         FIGS. 6A and 6B  illustrate a display mode in a case where the movable range is rotated.  FIG. 6A  illustrates the movable range in a state where a slewing table is rotated in an arbitrary direction, and  FIG. 6B  illustrates a state where the movable range is rotated according to rotation of the slewing table. 
         FIGS. 7A and 7B  illustrate a difference in the movable range depending on a position of the crane with respect to the feature.  FIG. 7A  illustrates the movable range in a state where the crane approaches the feature, and  FIG. 7B  illustrates the movable range in a state where the crane is separated from the feature. 
         FIG. 8  is a flowchart illustrating a mode of movable range display control in the movable range display system. 
         FIG. 9  illustrates a display mode including the movable range and a position of a remote operation terminal. 
         FIGS. 10A and 10B  illustrate a display mode of the movable range based on data of a distance sensor of a boom. tip.  FIG. 10A  illustrates a top view image of the movable range, and  FIG. 10B  illustrates a cross-sectional view image of the movable range along the axial direction of the boom. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a crane  1  that is an embodiment of a mobile crane according to the present invention will be described using  FIGS. 1 and 2 . Note that a rough terrain crane will be described in the present embodiment, but the mobile crane is only required to be an all-terrain crane, a truck crane, a truck loader crane, or the like. 
     As illustrated in  FIG. 1 , the crane  1  is a mobile crane  1  that can be moved to an unspecified place. The crane  1  includes a vehicle  2  that is a travelling body, a crane apparatus  6  that is a work apparatus, a control device  31 , and a remote operation terminal  37  (see  FIG. 2 ) capable of remotely operating the crane apparatus  6 . Further, the crane  1  includes a movable range display system  32  (see  FIG. 2 ). 
     The vehicle  2  is a mobile body that transports the crane apparatus  6 . The vehicle  2  has a plurality of wheels  3  and travels using an engine  4  as a power source. The vehicle  2  is provided with outriggers  5 . The vehicle  2  can expand the workable range of the crane  1  by extending the outriggers  5  in a width direction of the vehicle  2  and grounding jack cylinders. In the outriggers  5 , each outrigger  5  is provided with a sensor for the outrigger  5  that detects an overhanging amount of the outrigger  5 . 
     The crane apparatus  6  is an apparatus that lifts a load W with a wire rope. The crane apparatus  6  includes a slewing table  7 , a slewing hydraulic motor  8 , a boom  9 , a main hook block  10 , a sub hook block  11 , a raising-lowering hydraulic cylinder  12 , a main winch  13 , a main hydraulic motor  13   a,  a main wire rope  14 , a sub winch  15 , a sub hydraulic motor  15   a,  a sub wire rope  16 , a cabin  17 , and the like. 
     The slewing table  7  is a device that slews the crane apparatus  6 . The slewing table  7  is configured to be rotatable about the center of an annular bearing as a rotation center. The slewing table  7  is provided with a slewing hydraulic motor  8  that is an actuator. The slewing table  7  is configured to be slewable in one direction and another direction by the slewing hydraulic motor  8 . 
     The slewing hydraulic motor  8  is rotationally operated by a slewing valve  23  (see  FIG. 2 ) that is an electromagnetic proportional switching valve. The slewing valve  23  can control the flow rate of hydraulic oil supplied to the slewing hydraulic motor  8  to an arbitrary flow rate. The slewing table  7  is provided with a slewing sensor  27  (see  FIG. 2 ) that detects a slewing angle α, which is an angle at which the slewing table  7  has slewed from a reference position. 
     The boom  9  is a beam member that supports the wire rope in a state where the load W can be lifted. A base end of a base boom member of the boom  9  is swingably provided substantially at the center of the slewing table  7 . The boom  9  is configured to be capable of extending and contracting in the axial direction by moving each boom member by an extension-contraction hydraulic cylinder that is not illustrated and that is an actuator. Further, the boom  9  is provided with a jib  9   a.  The boom  9  is provided with an extension-contraction sensor  28  that detects the length of the boom  9 , a weight sensor that detects the weight of the load W, and the like. 
     The suspended load camera  9   b  (see  FIG. 2 ) is an imaging device that captures an image of the load W and a feature C around the load W. The suspended load camera  9   b  is provided at a tip portion of the boom  9 . The suspended load camera  9   b  is configured to be capable of capturing an image of the load W and a feature C and topography around the crane  1  from vertically above the load W. 
     The main hook block  10  and the sub hook block  11  are members for suspending the load W. The main hook block  10  is provided with a plurality of hook sheaves around which the main wire rope  14  is wound, and a main hook  10   a  for suspending the load W. The sub hook block  11  is provided with a sub hook  11   a  for hanging the load W. 
     The raising-lowering hydraulic cylinder  12  is an actuator that raises and lowers the boom  9  and holds the posture of the boom  9 . The raising-lowering hydraulic cylinder  12  is operated to expand and contract by a raising-lowering valve  25  (see  FIG. 2 ) that is an electromagnetic proportional switching valve. The boom  9  is provided with a raising-lowering sensor  29  (see  FIG. 2 ) that detects a raising-lowering angle β of the boom  9 . 
     The main winch  13  and the sub winch  15  reel in (wind up) and reel out (wind out) the main wire rope  14  and the sub wire rope  16 . The main winch  13  is configured such that a main drum around which the main wire rope  14  is wound is rotated by a main hydraulic motor  13   a  that is an actuator, and the sub winch  15  is configured such that a sub drum around which the sub wire rope  16  is wound is rotated by a sub hydraulic motor  15   a  that is an actuator. 
     The main hydraulic motor  13   a  is rotationally operated by a main valve  26   m  (see  FIG. 2 ) that is an electromagnetic proportional switching valve. The main winch  13  is configured to be operable at an arbitrary reel in and reel out speed by controlling the main hydraulic motor  13   a  by the main valve  26   m.  Similarly, the sub winch  15  is configured to be operable at an arbitrary reel in and reel out speed by controlling the sub hydraulic motor  15   a  by a sub valve  26   s  (see  FIG. 2 ) that is an electromagnetic proportional switching valve. 
     The cabin  17  is mounted on the slewing table  7 . The cabin  17  is provided with a cockpit (not illustrated). The cockpit is provided with an operation part for travelling operation of the vehicle  2 , a slewing operation part  18  for operating the crane apparatus  6 , a raising-lowering operation part  19 , an extension-contraction operation part  20 , a main drum operation part  21   m,  a sub drum operation part  21   s,  and the like. 
     As illustrated in  FIG. 2 , a communication device  22  is a device that receives a control signal from the remote operation terminal  37  via a wide area information communication network or the like, and transmits control information and the like from the crane apparatus  6  via the wide area information communication network or the like. The communication device  22  is provided in the cabin  17 . The communication device  22  is configured to transfer a control signal or the like to the control device  31  of the crane  1  when the control signal or the like is received from the remote operation terminal  37 . 
     A GNSS receiver  30  (see  FIG. 2 ) is a receiver constituting a global navigation satellite system, and is a device that receives a ranging electric wave from a satellite and calculates latitude, longitude, and altitude which are position coordinates of the receiver. The crane  1  can acquire position coordinates of the tip of the boom  9  and position coordinates of the cabin  17  by the GNSS receiver  30 . 
     The control device  31  is a device that controls actuators of the crane  1  via respective operation valves. The control device  31  is provided in the cabin  17 . The control device  31  may substantially have a configuration in which a CPU, a ROM, a RAM, an HDD, and the like are connected by a bus, or have a configuration including a one-chip LSI or the like. The control device  31  stores various programs and data in order to control operation of each actuator, switching valve, sensor, and the like. 
     The control device  31  is connected to the suspended load camera  9   b,  the slewing operation part  18 , the raising-lowering operation part  19 , the extension-contraction operation part  20 , the main drum operation part  21   m,  and the sub drum operation part  21   s,  and can acquire a video of the suspended load camera  9   b  and acquire the operation. amount of each of the slewing operation part  18 , the raising-lowering operation part  19 , the main drum operation part  21   m,  and the sub drum operation part  21   s.    
     The control device  31  is connected to the communication device  22 , and can acquire the control signal from the remote operation terminal  37  and transmit the control information from the crane apparatus  6 , the video from the suspended load camera  9   b,  and the like. 
     The control device  31  is connected to the slewing valve  23 , an extension-contraction valve  24 , the raising-lowering valve  25 , the main valve  26   m,  and the sub valve  26   s,  and can transmit a control signal to the slewing valve  23 , the raising-lowering valve  25 , the main valve  26   m,  and the sub valve  26   s.    
     The control device  31  is connected to the slewing sensor  27 , the extension-contraction sensor  28 , and the raising-lowering sensor  29 , and can acquire posture information such as a slewing angle α, a boom, length, and a raising-lowering angle β of the slewing table  7  and the weight of the load W. 
     The control device  31  is connected to the GNSS receiver  30 , and can acquire position coordinates of the tip of the boom  9  and position coordinates of the cabin  17  with high accuracy. Further, the control device  31  can calculate an arrangement direction, which is the travelling direction of the vehicle  2 , with high accuracy from the position coordinates of the tip of the boom  9  and the position coordinates of the cabin  17  that have been acquired. 
     The control device  31  can generate a control signal corresponding to each operation part on the basis of operation amounts of the slewing operation part  18 , the raising-lowering operation part  19 , the extension-contraction operation part  20 , the main drum operation part  21   m,  and the sub drum operation part  21   s.    
     The movable range display system  32  is a system that calculates and displays a movable range A of the crane  1  at an arbitrary position in the work site. The movable range display system  32  is provided in the cabin  17  of the crane  1 . 
     The movable range display system  32  is connected to the control device  31 , and can acquire, from the control device  31 , the overhanging length of each outrigger  5 , the slewing angle α of the slewing table  7 , the raising-lowering angle β and the boom length of the boom  9 , and the weight of the load W from the control device  31 . 
     The crane  1  configured as described above can move the crane apparatus  6  to an arbitrary position by causing the vehicle  2  to travel. Further, in the crane  1 , a lifting height and a work radius of the crane apparatus  6  can be expanded by raising the boom  9  at an arbitrary raising-lowering angle β by the raising-lowering hydraulic cylinder  12  by operating the raising-lowering operation part  19 , and by extending the boom  9  to an arbitrary boom length by operating the extension-contraction operation part  20 . Further, in the crane  1 , the load W can be suspended by the sub drum operation part  21   s  and the like, and the load W can be conveyed by clewing the slewing table  7  by operating the slewing operation part  18 . 
     Next, the movable range display system  32  will be specifically described using  FIGS. 3 and 4A and 4B . The movable range display system  32  is a system that calculates the movable range A of the crane  1  under an arbitrary operation condition a an arbitrary arrangement position and arrangement direction in the work site, and displays the movable range A in a two-dimensional image or a three-dimensional image. The movable range A of the crane  1  means a range in which the tip of the boom  9  can reach in a state where a load W having a predetermined weight is suspended on the boom  9  extended to a predetermined boom length. 
     As illustrated in  FIG. 3 , the movable range display system  32  includes a system-side communication device  33 , an input device  34 , a display device  35 , and a system control device  36 . Note that the system control device  36  functions as a “first acquisition unit”, a “second acquisition unit”, a “third acquisition unit”, a “calculation unit”, and a “display unit” of the present invention. 
     The system-side communication device  33  is a device that transmits and receives information to and from the control device  31  of the crane  1 , an external server that is not illustrated, and the like. The system-side communication device  33  is provided in the cabin  17 . The system-side communication device  33  is configured to acquire the current position and arrangement direction of the vehicle  2  in the crane  1  and the current operation condition of the crane  1  from the control device  31  of the crane  1 . Further, the system-side communication device  33  i.s configured to acquire three-dimensional information of the work site where the crane  1  is arranged from the external server or the like. The operation condition of the crane  1  is a condition that affects the movable range A of the load W, and refers to the model of the crane  1 , the overhanging amount of the outrigger  5 , the boom length of the boom  9 , the use state of the jib, and the weight of a counterweight in the present embodiment. 
     The input device  34  is a device to which the operator inputs operating conditions of the crane  1 . The input device  34  is provided in the cabin  17 . Further, the input device  34  is configured to be displayed on the display device  35  and input from the screen. The input device  34  is configured to input an arbitrary value regarding the weight of the carried load W, the arrangement position and arrangement direction of the vehicle  2  in the crane  1 , the operation condition of the crane  1 , and the like. 
     The display device  35  is a device that displays the movable range A of the crane  1  and the input device  34 . The display device  35  is arranged inside the cabin  17 . The display device  35  includes a touch panel that can be input from a screen. The display device  35  is configured to display a two-dimensional image and a three-dimensional image of the work site, the crane  1 , the movable range A of the crane  1 , the operation conditions of the crane  1 , and the like. 
     The system control device  36  is a control device that calculates the movable range A of the crane  1  from three-dimensional information of the work site, the weight of the load W, the arrangement position and arrangement direction of the vehicle  2  the crane  1 , the operating condition of the crane  1 , and the like. The system control device  36  is provided in the cabin  17 . The system control device  36  may substantially have a configuration in which a CPU, a ROM, a RAM, an HDD, and the like are connected by a bus, or may have a configuration including a one-chip LSI or the like. The system control device  36  stores various programs and data in order to acquire information from the system-side communication device  33  and the input device  34 , calculate the movable range A of the crane  1 , and display the movable range A on the display device  35 . 
     The system control device  36  is connected to the system-side communication device  33 , and can acquire three-dimensional information of the work site via the system-side communication device  33 . Further, the system control device  36  can acquire the current position and arrangement direction of the vehicle  2  the crane  1  via the system-side communication device  33 . Further, the system control device  36  can acquire the operation condition of the crane  1  via the system-side communication device  33 . 
     The system control device  36  is connected to the input device  34  and can acquire three-dimensional information of the work site via the input device  34 . Further, the system control device  36  can acquire the weight of the load W, the model of the crane  1 , the arrangement position and arrangement direction of the vehicle  2  in the crane  1  arbitrarily determined by the operator, and the operating condition of the crane  1  via the input device  34 . 
     The system control device  36  can calculate a difference between the acquired current arrangement position and arrangement direction of the vehicle  2  in the crane  1  and the arrangement position and arrangement direction of the vehicle  2  arbitrarily determined by the operator. That is, the system control device  36  can calculate the moving distance and the moving direction from the current position to the arbitrarily determined arrangement position of the vehicle  2 , and the moving angle from the current arrangement direction of the vehicle  2  to the arbitrarily determined arrangement direction. 
     The system control device  36  is connected to the display device  35 , and can cause the display device  35  to display the two-dimensional image or the three-dimensional image of the work site. Further, the system display device  35  can display an image M 1  of the crane  1  and the movable range A of the crane  1  on the display device  35 . In the present embodiment, it is assumed that a two-dimensional image is displayed on the display device  35 . 
     As illustrated in  FIGS. 4A and 4B , the system control device  36  can display an image expressing the boom length, the slewing angle α, and the raising-lowering angle β based on the current operation condition of the crane  1 . When displaying the two-dimensional image, the system control device  36  can display by switching between the image M 1  of the crane  1  and the movable range A (see the shaded portion in  FIG. 4A ) in a top view image, which is a display from above the crane  1 , and the image M 1  of the crane  1  and the movable range A (see the shaded portion in  FIG. 4B ) in a side view image, which is a cross-sectional view along the boom  9  at the arbitrary slewing angle α. 
     The system control device  36  can calculate, as the movable range A, a region excluding a range in which the boom  9  is likely to interfere with the feature C or the like on the basis of the three-dimensional information of the work site from the weight of the load W, the model of the crane  1 , the operating condition of the crane  1 , the three-dimensional information of the work site, and the arrangement position and arrangement direction of the vehicle  2  of the crane  1  at the work site, which are acquired via the system side communication device  33  and the input device  34 , and can cause the display device  35  to display the movable range A. 
     Since the movable range display system  32  configured as described above acquires the three-dimensional information of the work site, a range in which the load W can be conveyed when the crane  1  is arranged in an arbitrary direction at an arbitrary position in the work site is displayed before the crane  1  is actually arranged at the work site. Further, the movable range display system  32  displays an arbitrary arrangement position where the operator displays the movable range A, and a moving amount and a moving direction to an arrangement direction. 
     Next, control of the movable range display system  32  will be described using  FIGS. 5A to 7B . The movable range display system  32  has a check mode for displaying the movable range A of the crane  1  in the current arrangement position and arrangement direction, and a plan mode for displaying the movable range A of the crane  1  in the arbitrary arrangement position and arrangement direction. 
     The system control device  36  of the movable range display system  32  starts the check mode when the crane  1  is started. The system control device  36  acquires three-dimensional information of the work site and the current arrangement position and arrangement direction of the vehicle  2  in the crane  1  via the system-side communication device  33  at every unit time. Moreover, the system control device  36  acquires the operating condition of the crane  1  via the system-side communication device  33  at every unit time. Further, the system control device  36  acquires the weight of the load W via the system-side communication device  33  at every unit time. 
     As illustrated in  FIGS. 5A and 5B , the system control device  36  calculates the slewing angle α 2  from the slewing angle α 1  at which the boom  9  interferes with the feature C at the work site on the basis of the three-dimensional information of the work site (see  FIG. 5A ). Next, the system control device  36  calculates a minimum raising-lowering angle β 1  at which the boom  9  interferes with the feature C between the slewing angle α 1  and the slewing angle α 2  for each unit slewing angle. Moreover, the system control device  36  calculates, for each unit raising-lowering angle, a range that the tip of the boom  9  can reach between the slewing angle α 1  and the slewing angle α 2  at the raising-lowering angle β 1  or more (see  FIG. 5B ). The system control device  36  displays, on the display device  35 , the movable range A (see the shaded portion) in consideration of the range that the tip of the boom  9  can reach between the slewing angle α 1  at which the boom  9  interferes with the feature C and the slewing angle α 2 . 
     The system control device  36  displays the movable range A in the current position of the vehicle  2 , which is calculated on the basis of the acquired information, and the arrangement direction on the display device  35  at every unit time. When the crane  1  moves, the system control device  36  displays the movable range A in the new arrangement position and arrangement direction of the vehicle  2 . That is, in the check mode, the movable range display system  32  calculates the movable range A in the current arrangement position and arrangement direction under the current operating condition along with the movement of the crane  1 , and sequentially displays the movable range A. 
     As illustrated in  FIGS. 6A and 6B , when the plan mode is selected, the system control device  36  calculates the movable range A under an arbitrary operating condition in an arbitrary arrangement position and arrangement direction. The system control device  36  causes the display device  35  to display an input screen constituting the input device  34 . The system control device  36  acquires an arbitrary operating condition of the crane  1  and an arbitrary arrangement position and arrangement direction of the vehicle  2  from the input device  34 , and calculates the movable range A in the arbitrary arrangement position and arrangement direction under an arbitrary operating condition. Moreover, the system control device  36  calculates a moving distance and a moving direction from the current position to an arbitrary arrangement position of the vehicle  2 , and a moving angle from the current arrangement direction to an arbitrary arrangement direction of the vehicle  2  by an arrow Ar and character information, and causes the display device  35  to display the moving distance, the moving direction, and the moving angle. 
     In the check mode and the plan mode, when the slewing table  7  of the crane  1  slews in one direction from the reference position by the slewing angle α (see  FIG. 6A ), the system control device  36  can display the top view of the two-dimensional image or the three-dimensional image of the work site displayed on the display device  35  and the movable range A by rotating in another direction by the slewing angle α (see  FIG. 6B ). With this configuration, the work site and the movable range A (see the shaded portion) are displayed with reference to the cabin  17  that slews together with the sieving table  7 , so that the operator can easily grasp the positional relationship at the work site. 
     As illustrated in  FIGS. 7A and 7B , the movable range A (see the shaded portion) of the crane  1  varies depending on the positional relationship with the feature C. For example, the minimum raising-lowering angle β 11  (see  FIG. 7A ) at which the boom  9  in the crane  1  arranged close to the feature C interferes with the feature C is larger than the minimum raising-lowering angle β 12  (see  FIG. 7B ) at which the boom  9  in the crane  1  arranged apart from the feature C interferes with the feature C. Therefore, a movable range A 1  of the crane  1  arranged close to the feature C illustrated in  FIG. 7A  is smaller than a movable range A 2  of the crane  1  arranged apart from the feature C illustrated in  FIG. 7B . 
     Hereinafter, movable range display control by the movable range display system  32  will be specifically described using  FIG. 8 . Note that in the present embodiment, it is assumed that the three-dimensional information of the work site has already been acquired. 
     As illustrated in  FIG. 8 , in step S 110  of the movable range display control, the system control device  36  starts the check mode when the crane  1  is started, acquires the current arrangement position and arrangement direction of the vehicle  2  in the crane  1 , and advances the step to step S 120 . 
     In step S 120 , the system control device  36  acquires the model of the crane  1  and the operating condition of the crane  1  via the system-side communication device  33  or the input device  34 , and advances the step to step S 130 . 
     In step S 130 , the system control device  36  calculates the movable range A in the current arrangement position and arrangement direction from the acquired information, and advances the step to step S 140 . 
     In step S 140 , the system control device  36  causes the display device  35  to display the calculated movable range A, and advances the step to step S 150 . 
     In step S 150 , the system control device  36  determines whether or not the plan mode is selected. Consequently, when the plan mode is selected, the system control device  36  advances the step to step S 160 . On the other hand, when the plan mode is not selected, that is, when the check mode is maintained, the system control device  36  advances the step to step S 110 . 
     In step S 160 , the system control device  36  starts the plan mode, acquires an arbitrary arrangement position and arrangement direction of the vehicle  2  in the crane  1 , and advances the step to step S 170 . 
     In step S 170 , the system control device  36  acquires the model of the crane  1  and the operating condition of the crane  1  arbitrarily selected via the input device  34 , and advances the step to step S 180 . 
     In step S 180 , the system control device  36  calculates the movable range A in the arbitrary arrangement position and arrangement direction from the acquired information, and advances the step to step S 190 . 
     In step S 190 , the system control device  36  calculates a moving distance and a moving direction from the current arrangement position to the arbitrary arrangement position, and a moving angle from the current arrangement direction to the arbitrary arrangement direction, and advances the step to step S 200 . 
     In step S 200 , the system control device  36  causes the display device  35  to display the calculated movable range A, the moving distance and the moving direction to the arbitrary arrangement position, and the like, and advances the step to step S 110 . 
     In a case of the check mode, the movable range display system  32  configured as described above sequentially displays the movable range A on the basis of the current arrangement position and arrangement direction of the vehicle  2  in the crane  1  at every unit time. In the movable range display system  32 , since the position and the shape of the feature C with reference to the accurate position of the mobile crane  1  at the work site are specified, the movable range A considering the position and the shape of the feature C is calculated with high accuracy. 
     Further, in a case of the plan mode, the movable range display system  32  displays the movable range A based on the arbitrary arrangement position and arrangement direction of the vehicle  2  in the crane  1 . Moreover, the movable range display system  32  displays the moving distance, the moving direction, and the moving angle of the vehicle  2  to the arbitrary arrangement position and arrangement direction. The movable range display system  32  enables to easily check whether the mobile crane  1  as arranged in the arrangement position and arrangement direction of the mobile crane  1  specified for carrying the load W at the work site. Thus, the user who uses the movable range display system  32  can consider the arrangement position and arrangement direction of the mobile crane  1  capable of conveying the load W to the destination without interfering with the feature C or the like in the work site. 
     Note that in the present embodiment, the movable range display system  32  is provided inside the cabin  17  of the crane  1 , but may be provided in a mobile terminal that can be carried outside the cabin  17 . For example, the remote operation terminal  37  that is a mobile terminal is provided with the system-side communication device  33 , the input device  34 , the display device  35 , and the system control device  36  in addition to various operation parts for operating the crane  1  (see  FIG. 3 ). Further, the remote operation terminal  37  includes a terminal-side GNSS receiver  38 . The system control device  36  can acquire the current position of the remote operation terminal  37  from the terminal-side GNSS receiver  38  via the system-side communication device  33 . Note that in the present embodiment, the remote operation terminal  37  may be provided with a short-range wireless communication device capable of detecting a position instead of the terminal-side GNSS receiver  38 . 
     As illustrated in  FIG. 9 , upon acquiring the current position of the remote operation terminal  37  in the check mode and the plan mode, the system control device  36  displays an image M 2  indicating the remote operation terminal  37  in the three-dimensional image or the two-dimensional image of the work site displayed on the display device  35 . With this configuration, in the movable range display system  32 , the positional relationship among the crane  1 , the feature C, and the operator at the work site becomes clear. Thus, the user who uses the movable range display system  32  can consider the arrangement position and arrangement direction of the mobile crane  1  capable of conveying the load W to the destination without interfering with the feature C or the like in the work site. 
     Note that in the present embodiment, although the system control device  36  of the movable range display system  32  acquires the three-dimensional information of the work site from the external server or the like, as illustrated in  FIGS. 10A and 10B , a configuration may be employed in which a distance sensor, a laser scanner, or the like that detects the distance to the object is provided at the tip of the boom  9  to collect the three-dimensional information of the work site. The system control device  36  calculates the movable range A (see the shaded portion) on the basis of a measurement value of the distance sensor, causes the display device  35  to display the movable range A, and displays the measurement result on the movable range A as an image M 3  in an overlaid manner. 
     The above-described embodiments are merely representative forms, and various modifications can be made without departing from the gist of one embodiment. It is a matter of course that the present invention can be implemented in various forms, and the scope of the present invention is indicated by the description of the claims, and further includes equivalent meanings described in the claims and all modifications within the scope. 
     The entire disclosure of the description, drawings, and abstract included in Japanese Patent Application No. 2019-114949 filed on Jun. 20, 2019 is incorporated herein by reference. 
     REFERENCE SIGNS LIST 
     
         
           1  crane 
           6  crane apparatus 
           9  boom 
           30  GNSS receiver 
           31  control device 
           32  movable range display system 
           33  system-side communication device 
           34  input device 
           35  display device 
           36  system control device 
         A movable range