JP2009126641A - Device for displaying operating condition of safety device for crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately determine operating condition of each of limit switches. <P>SOLUTION: In response to operating condition of a first overwinding limit switch and a second overwinding limit switch provided corresponding to a boom, a jib, a boom hook and a jib hook of a crawler crane, display color of a boom image 12a, a jib image 12b, a boom hook image 12c and a jib hook image 12d in an illustration 12 of the crane displayed on a screen 11a of an image display device 11 is changed in order from normal green to red through yellow. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane safety device operation status display device used for displaying an operation status of a safety device for preventing booms, jibs, boom hooks, and jib hooks from being excessively wound in a crane such as a crawler crane.

  As one type of mobile crane, a self-propelled crawler crane as shown in FIGS. 5A and 5B is known. The upper revolving unit 2 is turnably provided on the upper side of the lower traveling unit 1 that is designed to travel by a crawler. A base end portion of a boom (post) 3 is attached to the upper swing body 2 so as to be raised and lowered, and a boom hook (main hook) 4 is provided at the distal end portion of the boom 3 so as to be lifted and lowered. Further, the base end portion of the jib 5 is connected to the tip end of the boom 3 so as to be able to be lifted and the jib hook (sub hook) 6 is mounted on the tip end portion of the jib 5 so as to be able to be lifted and lowered (for example, Patent Documents). 1).

  The hoisting operation of the boom 3 and the raising / lowering operation of the jib 5 are both performed by unwinding and unwinding the wire by a drum (not shown) equipped in the upper swing body 2. The boom hook 4 is lifted and lowered, and the jib hook 6 is lifted and lowered by winding and unwinding a wire by a drum (not shown) mounted on the upper swing body 2.

  By the way, in the crawler crane, in order to prevent the wires connected to the boom 3, jib 4, boom hook 5, and jib hook 6 from being wound by the drums (not shown), as shown in FIG. 3 is provided with a boom overwinding first limit switch 7a and a boom overwinding second limit switch 7b. The limit switches 7a and 7b allow the boom standing side to be used as the hoisting side of the boom 3 hoisting wire. The emergency limit can be detected.

  Similarly, a jib overwinding first limit switch 8a and a jib overwinding second limit switch 8b are provided in the jib 5, and each of the limit switches 8a and 8b serves as a winding side of the jib lifting wire. The service limit and the emergency limit on the rising side of the jib 5 can be detected.

  Further, a boom hook overwinding first limit switch 9a and a boom hook overwinding second limit switch 9b are provided below the tip of the boom 3 equipped with the boom hook 4, and each limit switch is provided. 9a and 9b, the normal limit and the emergency limit on the lifting side of the boom hook 4 which is the winding side of the wire connected to the boom hook 4 can be detected.

  Furthermore, a jib hook overwinding first limit switch 10a and a jib hook overwinding second limit switch 10b are provided below the tip of the jib 5 equipped with the jib hook 6, and each limit switch 10a is provided. 10b, it is possible to detect the service limit and the emergency limit on the lifting side of the jib hook 6 which is the winding side of the wire connected to the jib hook 6.

  Therefore, when each of the overwinding first limit switches 7a, 8a, 9a, 10a or each of the overwinding second limit switches 7b, 8b, 9b, 10b is operated, the system for automatically stopping the operation of each corresponding part. Adopting has become a common practice.

  Further, when each of the overwinding first limit switches 7a, 8a, 9a, 10a or each of the overwinding second limit switches 7b, 8b, 9b, 10b is operated, the boom 3, the jib 5, the boom hook 4, and the jib hook 6 are operated. Only the movement in the direction of increasing the stability of the crawler crane is possible, and the movement in the direction of decreasing the stability is not accepted. For this reason, usually, means for allowing the operator to determine the cause by using a lamp, a message, and voice is employed.

  In recent years, as one of means for displaying the moment limiter in the crawler crane, an illustration of the crawler crane is displayed on the screen of an image display device equipped in the crane control unit, and the work radius of the crane is superimposed on the illustration. In addition, a technique has been developed to display the elevation angle of the boom 3, the elevation angle of the jib 5, the weight of the suspended load suspended from the boom hook 4 or the jib hook 6 (see, for example, Patent Document 2). .

JP-A-8-12267 JP 2004-284730 A

  However, in the crawler crane, for example, when the hoisting of the boom hook 4 is stopped during the operation, the cause is that the boom hook overwinding first limit switch 9a for preventing the boom hook 4 from being excessively hoisted or the boom hook overheating. In addition to the operation of the winding second limit switch 9b, a stop signal resulting from excessive winding of the boom 3, excessive winding of the jib hook 6, or an overload from an overload prevention device (M / L) (not shown) Various causes are involved. For this reason, in the case where the above causes are displayed with lamps or the like, the number of lamps increases, which makes it difficult for the operator to understand.

  In addition, when the machine stops operating due to the disconnection of each of the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, it is difficult for the operator to identify the cause, and a serviceman etc. investigates the machine. There was a need to go to.

  Among the factors that cause the machine to stop automatically, in particular, each of the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b as a safety device is exposed to wind and rain, It is important to reduce the burden on the operator to know the operating status because it is installed at places where the investigation is not easily performed, such as the tip of the boom 3 or the tip of the jib 5. It becomes one of. In addition, a safety system is adopted that prevents the crawler crane from operating in a direction that reduces the stability when the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b are disconnected. It is one of the important equipment for performing.

  Therefore, the present invention is any one of the non-operating state, the first limit switch operating state, and the second limit switch operating state as the operating state of each limit switch attached to the boom, jib, boom hook, and jib hook in the crawler crane. It is an object of the present invention to provide a crane safety device operation status display device that enables an operator to easily and accurately determine whether or not the above is true.

  In order to solve the above-mentioned problem, the present invention comprises an image display device capable of displaying an illustration of a crane corresponding to claim 1, and the crane boom, jib, boom hook, and jib hook being excessively wound. In accordance with the operation of the limit switch for detecting the image, the control unit is configured to be able to change the display color of the corresponding part in the crane illustration displayed on the screen of the image display device. .

  In addition, the control unit in the above configuration is operated when the limit switch for detecting the crane boom, jib, boom hook, excessive limit of the jib hook is activated and when the limit switch is activated for detecting the emergency limit. The configuration has a function that can change the display color of the corresponding part in the illustration of the crane displayed on the screen of the image display device.

  Further, the control unit in each of the above configurations controls the display of the screen of the image display device and the input processing device that detects the operation of the limit switch for detecting the crane boom, jib, boom hook, and excessive lifting of the jib hook. An operation that gives a command to change the display color of the corresponding part in the illustration of the crane displayed on the screen of the image display device on the display processing device according to the operating state of the display processing device and the limit switch input from the input processing device And a processing apparatus.

According to the crane safety device operation status display device of the present invention, the following excellent effects are exhibited.
(1) An image display device capable of displaying an illustration of a crane, and the image display device according to the operation of a limit switch for detecting the crane boom, jib, boom hook, and jib hook overwinding. Since the control unit is configured to be able to change the display color of the corresponding part in the crane illustration displayed on the screen, the operator can select the crane displayed on the screen of the image display device. By looking at the colors of the boom image, jib image, boom hook image, and jib hook image in the illustration, it can be determined whether the limit switch corresponding to each of the boom, jib, boom hook, and jib hook is in an inoperative state or an activated state. Judgment can be made easily and accurately at a glance.
(2) When the limit switch for detecting the emergency limit of the crane boom, jib, boom hook, jib hook overwinding and the limit switch for detecting the emergency limit are Operators can handle crane booms, jibs, boom hooks, and jib hooks with a function that can change the display color of the relevant part of the crane illustration displayed on the display screen. The limit switch for normal limit detection and the limit switch for emergency limit detection are both inactive, or the limit switch for normal limit detection is in the active state, or for emergency limit detection. Displays on the screen of the image display device whether the limit switch is activated Boom image, jib image in crane illustrations are, boom hooks image, based on the color of the Jibufukku image, it is possible to easily and accurately determine at a glance.
(3) An input processing device for detecting the operation of a limit switch for detecting the crane boom, jib, boom hook, jib hook overwinding and a display processing device for controlling the display of the screen of the image display device. And an arithmetic processing unit for giving a command to change the display color of the corresponding part in the illustration of the crane displayed on the screen of the image display unit on the display processing unit according to the operating state of the limit switch input from the input processing unit. The limit switch corresponding to each of the boom, jib, boom hook, and jib hook is displayed on the screen of the image display device depending on whether the limit switch is in the non-operating state or the operating state. It is possible to easily construct a device configuration that changes the display color of the corresponding part in an illustration of a crane.

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

  FIGS. 1 (a), 1 (b) to 4 show an embodiment of the crane safety device operation status display device of the present invention. As shown in FIG. 6, the boom 3, the jib 5, and the boom hook 4 are shown. A crawler comprising each overwinding first limit switch 7a, 8a, 9a, 10a and each overwinding second limit switch 7b, 8b, 9b, 10b for detecting excessive winding of the wire respectively connected to the jib hook 6. The crane includes an image display device 11 that can display an illustration 12 of the crane on a screen 11a, and when the overwinding first limit switches 7a, 8a, 9a, and 10a are operated, the image display device 11 is operated. Boom image 12a, jib image 12b, boom hook image 12c, jib hook in crawler crane illustration 12 displayed on screen 11a When the display color of the corresponding part of the image 12d is the above-described overwinding first limit switch 7a, 8a, 9a, 10a and the overwinding second limit switch 7b, 8b, 9b, 10b, all are in an inoperative state. When the overwinding second limit switches 7b, 8b, 9b, and 10b are operated, the boom image in the crane illustration 12 displayed on the screen 11a of the image display device 11 is changed. 12a, the jib image 12b, the boom hook image 12c, and the jib hook image 12d are configured to include a control unit 13 that can change the display color of the corresponding portion to another color.

  Specifically, for example, when the overwinding first limit switches 7a, 8a, 9a, 10a and the overwinding second limit switches 7b, 8b, 9b, 10b are all in an inoperative state, the control unit 13 The boom image 12a, the jib image 12b, the boom hook image 12c, and the jib hook image 12d of the crane illustration 12 are all displayed in a green display color on the screen 11a of the image display device 11, and each overwinding first limit switch described above is displayed. When 7a, 8a, 9a, and 10a are in an operating state, the display colors of the images 12a, 12b, 12c, and 12d of the corresponding portion in the crane illustration 12 on the screen 11a of the image display device 11 are changed to yellow, and When the winding second limit switch 7b, 8b, 9b, 10b is in the activated state, the screen 11a of the image display device 11 is closed. Relevant portions 12a in the illustration 12 of over emissions, 12b, 12c, and made by the display color of 12d to have a function of changing to red.

  More specifically, as shown in FIG. 2, the control unit 13 includes an input processing device 14 for detecting the operation of each of the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, and an image display. A display processing device 15 for controlling the display content of the screen 11a of the device 11 and an arithmetic processing device 16 for giving a command to the display processing device 15 in response to an input from the input processing device 14 are provided. .

  3 and 4 are flowcharts showing the processing procedure of the arithmetic processing unit 16. The arithmetic processing unit 16 includes step A for setting the display color of the boom image 12a and the display color of the jib image 12b. Step B for setting the image, Step C for setting the display color of the boom hook image 12c, and Step D for setting the display color of the jib hook image 12d are sequentially provided.

  More specifically, when the boom image display color setting step A shown in FIG. 3 is started, the arithmetic processing device 16 first starts the boom overwinding first limit switch 7a and the boom overwinding second from the input processing device 14. After reading the operating status of the limit switch 7b (step A1), it is determined whether the boom overwinding second limit switch 7b is operating (step A2), and the boom overwinding second limit switch 7b. If it is determined that is not operating, the process proceeds to step A3 to determine whether or not the boom overwinding first limit switch 7a is operating. Thereafter, when it is determined in step A3 that the boom overwinding first limit switch 7a is not operated, the process proceeds to step A4, the display color of the boom image 12a is set to green, and the boom image is displayed. The display color setting step A ends.

  On the other hand, if it is determined in step A3 that the boom overwinding first limit switch 7a is in operation, the process proceeds to step A5 to set the display color of the boom image 12a to yellow, and then display the boom image. Color setting step A ends.

  Further, if it is determined in step A2 that the boom overwinding second limit switch 7b is operating, the process proceeds to step A6, where the display color of the boom image 12a is set to red, and then the boom image display is performed. Color setting step A ends.

  After the display color of the boom image 12a is set to green, yellow, or red in step A4, step A5, or step A6 of the boom image display color setting step A as described above, the process proceeds to the jib image display color setting step B. move on.

  In the above-described jib image display color setting step B, first, after reading the operation status of the jib overwinding first limit switch 8a and the jib overwinding second limit switch 8b from the input processing device 14 (step B1), It is determined whether or not the overwinding second limit switch 8b is operating (step B2). If it is determined that the jib overwinding second limit switch 8b is not operating, the process proceeds to step B3 and the jib It is determined whether or not the overwinding first limit switch 8a is operating. Thereafter, if it is determined in step B3 that the jib overwinding first limit switch 8a is not activated, the process proceeds to step B4, the display color of the jib image 12b is set to green, and the jib image The display color setting step B is completed.

  On the other hand, if it is determined in step B3 that the jib overwinding first limit switch 8a is operating, the process proceeds to step B5 to set the display color of the jib image 12b to yellow and then display the jib image. The color setting step B is completed.

  Furthermore, if it is determined in step B2 that the jib overwinding second limit switch 8b is operating, the process proceeds to step B6, where the display color of the jib image 12b is set to red, and then the jib image display is performed. The color setting step B is completed.

  After the display color of the jib image 12b is set to green, yellow, or red in step B4, step B5, or step B6 of the jib image display color setting step B as described above, the boom hook image display shown in FIG. Proceed to color setting step C.

  Next, in the boom hook image display color setting step C, first, after the operation status of the boom hook overwinding first limit switch 9a and the boom hook overwinding second limit switch 9b is read from the input processing device 14 (step C1), it is determined whether or not the boom hook overwinding second limit switch 9b is operating (step C2), and if it is determined that the boom hook overwinding second limit switch 9b is not operating, Proceeding to step C3, it is determined whether or not the boom hook overwinding first limit switch 9a is operating. Thereafter, if it is determined in step C3 that the boom hook overwinding first limit switch 9a is not activated, the process proceeds to step C4, and the display color of the boom hook image 12c is set to green. The boom hook image display color setting step C is completed.

  On the other hand, if it is determined in step C3 that the boom hook overwinding first limit switch 9a is operating, the process proceeds to step C5, where the display color of the boom hook image 12c is set to yellow, and then the boom The hook image display color setting step C is completed.

  Further, if it is determined in step C2 that the boom hook overwinding second limit switch 9b is activated, the process proceeds to step C6, where the display color of the boom hook image 12c is set to red, and then the boom The hook image display color setting step C is completed.

  After the boom hook image display color is set to green, yellow, or red in step C4, step C5, or step C6 of the boom hook image display color setting step C as described above, the boom hook image display color setting is performed. Proceed to step D.

  Thereafter, in the jib hook image display color setting step D, first, after the operation statuses of the jib hook overwinding first limit switch 10a and the jibhook overwinding second limit switch 10b are read from the input processing device 14 (step D1), It is determined whether or not the jib hook overwinding second limit switch 10b is operating (step D2). If it is determined that the jib hook overwinding second limit switch 10b is not operating, the process proceeds to step D3. It is determined whether the jib hook overwinding first limit switch 10a is operating. If it is determined in step D3 that the jib hook overwinding first limit switch 10a is not activated, the process proceeds to step D4 where the display color of the jib hook image 12d is set to green and the jib hook image display color is set. The setting step D ends.

  On the other hand, if it is determined in step D3 that the jib hook overwinding first limit switch 10a is in operation, the process proceeds to step D5 to set the display color of the jib hook image 12d to yellow, and then display the jib hook image. The color setting step D ends.

  Further, if it is determined in step D2 that the jib hook overwinding second limit switch 10b is operating, the process proceeds to step D6, where the display color of the jib hook image 12d is set to red, and then the jib hook image display is performed. The color setting step D ends.

  After the display color of the jib hook image 12d is set to green, yellow, or red in step D4, step D5, or step D6 of the jib hook image display color setting step D as described above, the arithmetic processing unit 16 moves the boom. Returning to the image display color setting step A, the processing is repeated. Thus, the arithmetic processing unit 16 sequentially repeats the image display color setting steps A, B, C, and D, thereby displaying each of the boom image 12a, the jib image 12b, the boom hook image 12c, and the jib hook image 12d. The color is always set so that it can be instructed to the display processing device 15. Therefore, on the screen 11a of the image display device 11, the boom image 12a, the jib image 12b and the boom hook image 12c in the crane illustration 12 are displayed. The jib hook image 12d can be displayed in the display color set at any time in each image display color setting step A, B, C, D by the arithmetic processing unit 16.

  The arithmetic processing unit 16 of the control unit 13 responds to an input from the input processing unit 14 with respect to a drum (not shown), a boom hoisting stop output, a boom lowering stop output, a jib hoisting stop output, and a jib lowering output. You may make it have a function which gives the instruction | command to the output processor 17 for outputting a stop output, a boom hook winding stop output, and a jib hook winding stop output.

  Further, each of the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b has a B contact. Thus, when the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b are disconnected, the input processing device 14 uses the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a and 10b are detected in the same manner as the operating state, so that the image display color of the corresponding portion in the crane illustration 12 displayed on the screen of the image display device 11 can be changed, and each of the above limit switches Similar to the operation of 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, the crawler crane can be prevented from moving in the direction of decreasing stability. Further, in this case, the broken limit switches 7a, 7b, 8a, 8b, and 9a in the crane illustration 12 displayed on the screen 11a of the image display device 11 also by the operation in the direction of increasing the stability of the crawler crane. , 9b, 10a, 10b, based on the fact that the display colors of the images 12a, 12b, 12c, 12d do not change, the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b The disconnection can be detected.

  When the crawler crane equipped with the crane safety device operation status display device having the above configuration is used, for example, when the boom overwinding first limit switch 7a (see FIG. 6) is operated due to excessive boom 3 winding, the image display device. 11, the color of the boom image 12a in the crane illustration 12 displayed on the screen 11a changes from the original green color as shown in FIG. 1 (a) to yellow as shown in FIG. 1 (b). Will come to do. Thereafter, when the boom overwinding second limit switch 7b (see FIG. 6) is actuated by further lifting the boom 3, the color of the boom image 12a in the crane illustration 12 displayed on the screen 11a of the image display device 11 is changed. It turns red.

  Similarly, when the jib overwinding first limit switch 8a (see FIG. 6) is activated due to excessive winding of the jib 5, the jib image 12b in the crane illustration 12 displayed on the screen 11a of the image display device 11 is displayed. The color changes to yellow from the original green. Thereafter, when the jib overwinding second limit switch 8b (see FIG. 6) is actuated by further winding the jib 5, the color of the jib image 12b in the crane illustration 12 displayed on the screen 11a of the image display device 11 changes. Further, the color changes to red. FIG. 1B shows a state where the color of the jib image 12b is changed to red.

  Further, when the boom hook overwinding first limit switch 9a (see FIG. 6) is actuated due to excessive winding of the boom hook 4, the boom hook image 12c in the crane illustration 12 displayed on the screen 11a of the image display device 11 is displayed. When the color changes to yellow and then the boom hook overwinding second limit switch 9b (see FIG. 6) is activated by further hoisting of the boom hook 4, the crane displayed on the screen 11a of the image display device 11 is activated. The color of the boom hook image 12c in the illustration 12 changes to red.

  Similarly, when the jib hook overwinding first limit switch 10a (see FIG. 6) is activated due to excessive winding of the jib hook 6, the color of the jib hook image 12d in the crane illustration 12 displayed on the screen 11a of the image display device 11 changes. When the jib hook overwinding second limit switch 10b (see FIG. 6) is actuated by further winding the jib hook 6, the jib hook in the crane illustration 12 displayed on the screen 11a of the image display device 11 is changed. The color of the image 12d changes to red. FIG. 1B shows a state in which the boom image 12a and the boom hook image 12c are changed to yellow, and the jib image 12b and the jib hook image 12d are changed to red.

  Thus, according to the crane safety device operation status display device of the present invention, the operator can view the boom image 12a, the jib image 12b, and the boom hook image in the crane illustration 12 displayed on the screen 11a of the image display device 11. 12c, by looking at the color of the jib hook image 12d, the boom overwind first limit switch 7a and the boom overwind second limit switch 7b of the crawler crane, the jib overwind first limit switch 8a attached to the jib, the jib overwind Whether the second limit switch 8b, the boom hook overwinding first limit switch 9a, the boom hook overwinding second limit switch 9b, the jib hook overwinding first limit switch 10a, and the jib hook overwinding second limit switch 10b are inactive. The operating status of the operating state can be easily and accurately determined at a glance. It can be determined.

  Further, the boom image 12a, the jib image 12b, the boom hook image 12c, and the jib hook image 12d in the crane illustration 12 displayed on the screen 11a of the image display device 11 also by the operation in the direction of increasing the stability of the crawler crane. The operator can easily detect the disconnection of the corresponding limit switch 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b based on the fact that the color of the color does not change from yellow or red.

  Therefore, the operator can see the operation status of all the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b as safety devices only by looking at the screen 11a of the image display device 11 installed in the crane. Since it is possible to know instantly, daily inspection of the safety device can be easily performed, and the cause can be specified even when each of the limit switches 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b is disconnected. Because it can be done easily, it can be expected to reduce the burden of explaining the situation on the telephone and investigating the actual machine of the service person.

  Further, for example, when the hook 4 or 6 that does not suspend the load is wound up without knowing the boom hook 4 or the jib hook 6, the image display device 11 is caused by overwinding of the hook 4 or 6 on the side where no load is displayed. Since the color of the hook image 12c or 12d corresponding to the hook 4 or 6 changes on the screen 11a, a human error prevention effect can be expected.

  Note that the present invention is not limited to the above embodiment, and the boom image display color setting step A, the jib image display color setting step B, and the boom hook image that are performed by the arithmetic processing unit 16 are performed. The order of the display color setting step C and the jib hook image display color setting step D may be changed.

  In the above embodiment, the boom image 12a, the jib image 12b, the boom hook image 12c, and the jib hook image 12d of the crane illustration 12 displayed on the screen 11a of the image display device 11 are from the viewpoint of easy identification and determination. Then, each overwinding first limit switch 7a, 8a, 9a, 10a and each overwinding second limit switch 7b, 8b, 9b, 10b are both green, and each overwinding first limit switch 7a, 8a, 9a, 10a are preferably shown in yellow when each overwinding second limit switch 7b, 8b, 9b, 10b is in operation, but it is desirable that the boom image 12a in each situation be displayed. The display colors of the jib image 12b, the boom hook image 12c, and the jib hook image 12d may be changed as appropriate.

  For the illustration of the crane that is to be displayed by the moment limiter on the screen 11a of the image display device 11, the boom image 12a, the jib image 12b, the boom hook image 12c, and the jib hook image 12d of the illustration are each overwhelmed. You may make it display by changing a color according to the operating condition of one limit switch 7a, 8a, 9a, 10a and each overwinding 2nd limit switch 7b, 8b, 9b, 10b.

  The present invention can also be applied to a crawler crane of a type in which a boom, a boom hook, a jib, and a jib hook are provided with a limit switch for detecting only a service limit or an emergency limit. In addition, as long as the normal limit and emergency limit of the movable part can be detected by a limit switch, it can be applied to a crane other than a crawler crane, and various changes can be made without departing from the scope of the present invention. Of course, it can be added.

1 shows an embodiment of a crane safety device operation status display device according to the present invention, in which (a) is a normal display on the screen of an image display device, (b) is for detecting an ordinary limit and an emergency limit. It is a figure which shows a display when a limit switch act | operates. It is a schematic diagram which shows the control part of the apparatus of FIG. It is a figure which shows the boom image display color setting step and jib image display color setting step in the processing flow by the arithmetic unit of the apparatus of FIG. It is a figure which shows the boom hook image display color setting step and jib hook image display color setting step following the processing flow of FIG. 3 by the arithmetic unit of the apparatus of FIG. An example of a crawler crane is shown, (A) is a schematic side view, (B) is an enlarged view of the tip side of the boom. It is a figure which shows the outline | summary of the structure which each equipped with the 1st and 2nd limit switch in order to prevent the boom, jib, boom hook, and jib hook from overwinding in a crawler crane.

Explanation of symbols

3 Boom 4 Boom Hook 5 Jib 6 Jib Hook 7a Boom Overwinding First Limit Switch 7b Boom Overwinding Second Limit Switch 8a Jib Overwinding First Limit Switch 8b Jib Overwinding Second Limit Switch 9a Boom Hook Overwinding First Limit Switch 9b Boom hook overwinding second limit switch 10a Jib hook overwinding first limit switch 10b Jib hook overwinding second limit switch 11 Image display device 11a Screen 12 Illustration of crane 12a Boom image 12b Jib image 12c Boom hook image 12d Jib hook image 13 Control Unit 14 Input processing device 15 Display processing device 16 Arithmetic processing device

Claims (3)

  On the screen of the image display device according to the operation of the limit switch for detecting the crane boom, jib, boom hook, and jib hook overwinding. A crane safety device operation status display device comprising a control unit configured to be able to change a display color of a corresponding portion in the crane illustration displayed on the screen.   When the limit switch for detecting the crane boom, jib, boom hook, jib hook overwinding normal limit is activated and the limit switch for detecting the emergency limit is activated, the control unit The crane safety device operation status display device according to claim 1, wherein the crane safety device operation status display device has a function of changing a display color of a corresponding portion of the crane illustration displayed on the screen.   An input processing device for detecting the operation of a limit switch for detecting the crane boom, jib, boom hook, jib hook overwinding, a display processing device for controlling display on the screen of the image display device, and the above An arithmetic processing unit that gives a command to change the display color of the corresponding part in the illustration of the crane displayed on the screen of the image display unit on the display processing unit according to the operating state of the limit switch input from the input processing unit. The crane safety device operation status display device according to claim 1 or 2, wherein the crane safety device operation status display device is configured.

Images