Crane display device

Abstract

To provide a crane display device which enables easy understanding of a relationship between a working radius and a critical load.SOLUTION: This crane display device comprises a control unit 15 that can cause a display unit 11 to display a first scale (radial scale 105) serving as a reference indicating a work radius, a second scale (weight scale 104) serving as a reference indicating the weight of a suspended load, a first pointer (radius pointer 107) indicating the work radius by pointing the first scale, and a second pointer (weight pointer 106) indicating the weight of the suspended load by pointing the second scale. The control unit 15 causes the first scale to be displayed along a linearly extending main axis with a value increasing toward one side in the main axis direction, the second scale to be displayed along the main axis with a value increasing toward the other side in the main axis direction, and the first and second scales to be displayed at positions corresponding to each other such that the second pointer indicates the critical load of the suspended load when the first and second pointers point the same positions.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a technology for a display device of a crane that is capable of displaying the limit load of a load hoisted by a crane attachment. [Background technology]

[0002] Conventionally, technology for a display device of a crane capable of displaying the limit load of a load hoisted by a crane attachment has been publicly known, as described in Patent Document 1, for example.

[0003] Patent Document 1 discloses a display device provided on a crane. The display device includes a controller, an angle detector that detects the angle of the boom, a load detector that detects the suspended load, and a display that displays work information.

[0004] In the technology described in Patent Document 1, an illustration of a crane, etc., and various numerical values ​​related to the work are displayed on a display based on an image signal generated by a controller. Specifically, the working radius of the suspended load, the load of the suspended load (suspension load), the limit value of the load that can be lifted at the current working radius (limit load), etc. are displayed on the display as numerical values. By checking the display, the worker (operator) can grasp information related to the work. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-284730 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, since the limit load is a value determined according to the working radius (the larger the working radius, the smaller the limit load), simply displaying the limit load numerically, as in Patent Document 1, makes it difficult to easily grasp the relationship between the working radius and the limit load, such as how much the working radius needs to be increased to reach the limit load.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and the problem to be solved by this invention is to provide a display device for a crane that makes it possible to easily grasp the relationship between the working radius and the limit load. [Means for solving the problem]

[0008] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0009] That is, in claim 1, the device comprises a display unit, and a control unit capable of causing the display unit to display a first scale serving as a reference indicating the tilt angle of the crane attachment or the working radius of the crane attachment, a second scale serving as a reference indicating the load of a load hoisted by the crane attachment, a first pointer indicating the tilt angle of the crane attachment or the working radius of the crane attachment calculated from the tilt angle of the crane attachment by pointing to the first scale, and a second pointer indicating the load of the suspended load by pointing to the second scale, wherein the control unit displays the first scale along a main axis extending linearly and with values ​​increasing toward one side in the main axis direction and displays the second scale along the main axis and with values ​​increasing toward the other side in the main axis direction, and displays the first scale and the second scale at positions corresponding to each other so that when the first pointer and the second pointer point to the same position, the second pointer indicates the limit load of the suspended load. In claim 2, the present invention comprises a display unit; and a control unit capable of causing the display unit to display a first scale serving as a reference indicating the tilt angle of the crane attachment or the working radius of the crane attachment, a second scale serving as a reference indicating the load of a load hoisted by the crane attachment, a first pointer indicating the tilt angle of the crane attachment or the working radius of the crane attachment calculated from the tilt angle of the crane attachment by pointing to the first scale, and a second pointer indicating the load of the suspended load by pointing to the second scale, wherein the control unit corresponds the first scale and the second scale to each other based on a moment curve that represents the relationship between the tilt angle of the crane attachment or the working radius of the crane attachment and the limit load of the suspended load, and is capable of switching between the first scale and the second scale based on a plurality of types of moment curves to be displayed on the display unit.

[0010] In claim 3, the control unit is configured to be able to switch the main axis from one that extends linearly to one that extends circumferentially with a predetermined point as a center.

[0011] In claim 4, the control unit changes the display position of the first pointer on the first scale according to the detection result by an angle detection unit capable of detecting the inclination angle, and changes the display position of the second pointer on the second scale according to the detection result by a load detection unit capable of detecting the load of the suspended load.

[0012] In claim 5, the control unit associates the first scale with the second scale based on a moment curve that represents the relationship between the tilt angle of the crane attachment or the working radius of the crane attachment and the limit load of the suspended load.

[0013] In claim 6, the control unit calculates the moment curve based on a first sample value of the tilt angle of the crane attachment or the working radius of the crane attachment and a second sample value of the limit load of the suspended load for the first sample value.

[0014] In claim 7, the control unit is capable of switching between the first scale and the second scale based on a plurality of types of the moment curves and displaying them on the display unit.

[0015] In claim 8, the control unit is capable of causing the display unit to display the moment curve.

[0016] In claim 9, the control unit is capable of causing the display unit to display, in addition to the first scale and the second scale, the current tilt angle of the crane attachment or the limit load of the suspended load relative to the working radius of the crane attachment. Effect of the Invention

[0017] The present invention has the following advantages.

[0018] In claim 1, the relationship between the working radius and the limit load can be easily understood. In claim 2, the relationship between the working radius and the limit load can be easily understood. Also, the relationship between the working radius and the limit load can be appropriately understood. Also, the relationship between the working radius and the limit load can be understood by using the first scale and the second scale based on a desired moment curve.

[0019] In claim 3, the relationship between the working radius and the limit load can be easily grasped.

[0020] In claim 4, the current work status can be quickly grasped.

[0021] In claim 5, the relationship between the working radius and the limit load can be properly grasped.

[0022] In claim 6, the moment curve can be easily used.

[0023] In claim 7, the relationship between the working radius and the limit load can be grasped by using the first scale and the second scale based on a desired moment curve.

[0024] In claim 8, a moment curve can be seen.

[0025] In claim 9, the limit load can be easily grasped. [Brief description of the drawings]

[0026] [Figure 1] 1 is a side view showing a schematic configuration of a crane equipped with a display device according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a block diagram showing a configuration of a display device. [Diagram 3] FIG. [Figure 4] A diagram showing a numerical measurement screen. [Diagram 5] FIG. 13 is a diagram showing a moment curve display on a moment curve display screen. [Figure 6] FIG. 13 is a diagram showing sample setting value displays on the moment curve display screen. [Figure 7] FIG. 13 is a diagram showing a moment curve setting screen. [Figure 8] 1A is a diagram showing an example of sample set values, calculation coefficients, and a calculation formula, and FIG. 1B is a diagram showing an example of a moment curve calculated from the sample set values. [Figure 9] A diagram showing an example of the relationship between working radius and limit load (moment curve). [Figure 10] FIG. 13 is a diagram showing a meter measurement screen according to the second embodiment. [Figure 11] FIG. 13 is a diagram showing a moment setting screen according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] First, a schematic configuration of a crane 1 equipped with a display device 10 according to a first embodiment of the present invention will be described with reference to FIG.

[0028] The crane 1 is a device that lifts and transports a load horizontally. The crane 1 mainly comprises a running body 2, a rotating body 3, a crane attachment (hereinafter simply referred to as a "jib") 4, a main hook 5, an auxiliary hook 6, a main hoist drum 7, an auxiliary hoist drum 8, and a display device 10.

[0029] The running body 2 is a portion provided with a traveling device for traveling the crane 1. The running body 2 is equipped with crawlers and the like. The rotating body 3 is a portion provided rotatably on the upper portion of the running body 2. The rotating body 3 is equipped with a cabin with a driver's seat and the like.

[0030] The jib 4 is a part for lifting a load and carrying it. The jib 4 is rotatably provided on the rotating body 3.

[0031] The main hook 5 is a hoisting device for hoisting a relatively heavy load. The main hook 5 is provided at the middle part of the jib 4. The auxiliary hook 6 is a hoisting device for hoisting a relatively light load. The auxiliary hook 6 is provided at the tip part of the jib 4.

[0032] The main hoist drum 7 is used to raise and lower the main hook 5. A main hoisting rope (not shown) connected to the main hook 5 is wound around the main hoist drum 7. The auxiliary hoist drum 8 is used to raise and lower the auxiliary hook 6. An auxiliary hoisting rope (not shown) connected to the auxiliary hook 6 is wound around the auxiliary hoist drum 8. The main hoist drum 7 and the auxiliary hoist drum 8 are provided on the rotating body 3.

[0033] The display device 10 is capable of appropriately acquiring various types of information related to the crane 1 and displaying it.

[0034] The configuration of the display device 10 will be described below with reference to Fig. 2. The display device 10 mainly comprises a display unit 11, a main winding load cell 12, an auxiliary winding load cell 13, a goniometer 14, and a control unit 15.

[0035] The display unit 11 is capable of displaying various types of information. The display unit 11 is configured with a touch panel that allows touch operation. In other words, the display unit 11 serves both as a display device that displays various types of information and as an input device that allows various types of information to be input. The display unit 11 is provided near the driver's seat of the traveling body 2 (at a position where the operator can see and operate it).

[0036] The main hoisting load cell 12 detects the load of the load hoisted by the main hook 5. The main hoisting load cell 12 detects the tension of the main hoisting rope (not shown) connected to the main hook 5, thereby detecting the load of the load.

[0037] The auxiliary hoisting load cell 13 detects the load of the load hoisted by the auxiliary hook 6. The auxiliary hoisting load cell 13 detects the tension of the auxiliary hoisting rope (not shown) connected to the auxiliary hook 6, thereby detecting the load of the load.

[0038] The angle meter 14 detects the inclination angle α of the jib 4. More specifically, the angle meter 14 can detect the inclination angle α (see FIG. 1) of the jib 4 with respect to the horizontal direction.

[0039] The control unit 15 controls various calculations, storage, and the like related to the display device 10. The control unit 15 includes a calculation means such as a CPU, a storage means such as a memory, and the like. The control unit 15 is connected to the main winding load cell 12, the auxiliary winding load cell 13, and the angle meter 14, and can acquire detection values ​​of the main winding load cell 12, etc. The control unit 15 is also connected to the display unit 11, and can acquire various information input to the display unit 11, as well as cause the display unit 11 to display desired images, character strings, and the like.

[0040] The control unit 15 can acquire various kinds of information regarding the crane 1, in addition to the detection values ​​of the main hoisting load cell 12 and the like exemplified in this embodiment.

[0041] Furthermore, the control unit 15 can output various types of information to the outside. For example, as described below, when the load of the suspended load reaches the limit load, an appropriate control signal can be output to the outside. By limiting the operation of the crane 1 based on the control signal (limiting the operation of the jib 4), it is possible to prevent an excessive moment from being applied to the crane 1. In this way, the display device 10 of this embodiment can be used as a system (so-called moment limiter) for preventing an excessive moment from being applied to the crane 1.

[0042] Next, various screens displayed on the display device 10 (display unit 11) will be specifically described with reference to FIG. 3 to FIG.

[0043] As described above, various information (images, character strings, etc.) can be displayed on the display unit 11 by the control unit 15. The screens displayed on the display unit 11 can be arbitrarily switched by appropriately operating a button display 101 described later. In this embodiment, as examples of screens displayed on the display unit 11, a meter measurement screen 100, a numerical value measurement screen 200, a moment curve display screen 300, and a moment curve setting screen 400 will be described in order.

[0044] First, the meter measurement screen 100 will be described. The meter measurement screen 100 shown in Fig. 3 is a screen capable of displaying the load of a suspended load and the working radius of the suspended load using scales. The meter measurement screen 100 mainly displays a button display 101, a status display 102, a message display 103, a load scale 104, a radius scale 105, a load pointer 106, a radius pointer 107, a load display 108, a radius display 109, and a limit load display 110.

[0045] The button display 101 displays buttons for an operator to perform an input operation. The button display 101 is displayed on the right end of the display unit 11. The button display 101 has images of multiple rectangular buttons. By touching a desired button, an operator can execute a function assigned to the button.

[0046] The status display 102 displays the status of the jib 4. More specifically, as described above, the status display 102 displays whether or not the load of the suspended load has reached the limit load and the movement of the jib 4 is currently restricted.

[0047] The message display 103 displays information regarding the operation of the crane 1. More specifically, the message display 103 displays what operation the crane 1 is currently performing (for example, the main hoist drum 7 is being hoisted, etc.).

[0048] The load scale 104 serves as a reference for indicating the current load of the suspended load. The load scale 104 is displayed approximately in the center of the display unit 11. The load scale 104 is displayed along a main axis X that extends on a circumference centered on a predetermined point. The load scale 104 is displayed on the outside of the main axis X. The load scale 104 is displayed with marks at equal intervals on a circumference along the main axis X. The load scale 104 is displayed so that the value increases toward one circumferential side (the clockwise direction in the example of FIG. 3).

[0049] The radius scale 105 serves as a reference for indicating the current working radius of the suspended load (the horizontal distance from the rotation center of the rotating body 3 to the suspended load). The radius scale 105 is displayed approximately in the center of the display unit 11. The radius scale 105 is displayed along the main axis X. In other words, the radius scale 105 is displayed along a circumference concentric with the load scale 104. The radius scale 105 is displayed inside the main axis X. The radius scale 105 is displayed so that the value increases toward the other circumferential side (the counterclockwise direction in the example of FIG. 3).

[0050] The control unit 15 displays the load scale 104 and the radius scale 105 at positions corresponding to each other. Specifically, the control unit 15 displays the load scale 104 and the radius scale 105 so that the load scale 104 displayed at the same position on the main axis X as the radius scale 105 indicates the limit load for the working radius indicated by that radius scale 105.

[0051] Here, the limit load will be described with reference to FIG.

[0052] The limit load is the limit value of the load of the suspended load that the crane 1 can lift. The value of the limit load depends on the limit value of the moment (load x working radius) due to the load of the suspended load. In other words, the limit load can be determined according to the working radius. FIG. 9 shows an example of a graph of the limit load set according to the working radius. Hereinafter, such a graph showing the relationship between the working radius and the limit load is referred to as a "moment curve." In the moment curve graph, the horizontal axis indicates the working radius (m) and the vertical axis indicates the limit load (t). As shown in FIG. 9, the limit load generally decreases as the working radius increases. The control unit 15 can calculate the limit load using a moment curve as shown in FIG. 9.

[0053] The control unit 15 stores a plurality of moment curves as shown in FIG. 9 in advance. Specifically, because the working radii of the main hook 5 and the auxiliary hook 6 are different (see FIG. 1), different moment curves are used when the main hook 5 is used and when the auxiliary hook 6 is used. In addition, because the moment curve can be set arbitrarily, for example, even when the same main hook 5 is used, any one moment curve can be selected and used from a plurality of different moment curves. The plurality of moment curves used in this manner are stored in the control unit 15.

[0054] The control unit 15 calculates the limit load from a moment curve as shown in Fig. 9, and based on the limit load, displays the load scale 104 and the radius scale 105 at positions corresponding to each other as described above (see Fig. 3). In the example shown in Fig. 3, the radius scale 105 is displayed at a position corresponding to the load scale 104 displayed at equal intervals, so the radius scale 105 is displayed at unequal intervals.

[0055] The load indicator 106 shown in Fig. 3 indicates the current load of the load by pointing to the load scale 104. The load indicator 106 is displayed so as to point to the load scale 104 from the inside of the main shaft X. The control unit 15 displays the load indicator 106 so as to point to the load scale 104 that corresponds to the load of the load (detection result) detected by the main winding load cell 12 or the auxiliary winding load cell 13. The example in Fig. 3 shows the load scale 104 indicating the load detected by the main winding load cell 12 (i.e., the load of the load hoisted by the main hook 5).

[0056] The radius indicator 107 indicates the current working radius of the suspended load by pointing to the radius scale 105. The radius indicator 107 is displayed so as to point to the radius indicator 107 from the inside of the main axis X. The control unit 15 calculates the working radius based on the inclination angle α of the jib 4 detected by the angle meter 14 (detection result), and displays the radius indicator 107 so as to point to the radius scale 105 corresponding to the working radius. The working radius can be geometrically calculated based on the inclination angle α and the shape of the jib 4, etc. The shape of the jib 4, etc. can be input (stored) into the control unit 15 as appropriate.

[0057] The load display 108 displays the current load of the suspended load as a numerical value. The load display 108 is displayed approximately in the center of the display unit 11 (inside the load scale 104 and the radius scale 105). The control unit 15 causes the load of the suspended load detected by the main winding load cell 12 or the auxiliary winding load cell 13 to be displayed as a numerical value on the load display 108. The example in Fig. 3 shows an example of the load of the suspended load detected by the main winding load cell 12, and the word "main winding" is displayed above the load display 108 to indicate this.

[0058] The radius display 109 displays the working radius of the current suspended load as a numerical value. The radius display 109 is displayed below the load display 108. The control unit 15 calculates the working radius based on the inclination angle α of the jib 4 detected by the angle meter 14, and causes the radius display 109 to display the working radius as a numerical value.

[0059] The limit load display 110 displays the limit load (allowable load) at the current working radius as a numerical value. The limit load display 110 is displayed below the radius display 109. The control unit 15 calculates the limit load based on the current working radius and moment curve, and causes the limit load display 110 to display the limit load as a numerical value. Note that in the example of FIG. 3, "allowable load" is displayed immediately above the limit load display 110, but in this embodiment, "allowable load" is synonymous with "limit load."

[0060] The operator can arbitrarily select which load (the load detected by the main winding load cell 12 or the load detected by the auxiliary winding load cell 13) to display on the above-mentioned meter measurement screen by operating the button display 101 or the like. In addition, the operator can arbitrarily select the moment curve used to calculate the limit load by operating the button display 101 or the like. When a moment curve is selected (changed), the control unit 15 switches the load scale 104 and radius scale 105 to the load scale 104 and radius scale 105 based on the selected moment curve and displays them on the display unit 11.

[0061] Next, the display mode of the above-mentioned meter measurement screen 100 will be described.

[0062] As described above, the load indicator 106 is displayed to indicate the current load of the suspended load by pointing to the load scale 104. For example, when the load of the suspended load increases, the load indicator 106 moves clockwise as shown in FIG. 3. Moreover, the radius indicator 107 is displayed to indicate the current working radius of the suspended load by pointing to the radius scale 105. For example, when the working radius increases, the radius indicator 107 moves counterclockwise as shown in FIG. 3.

[0063] As described above, the radius scale 105 and the load scale 104 are displayed in such a manner that the load scale 104 displayed at the same position as the radius scale 105 indicates the limit load at the working radius indicated by that radius scale 105. In other words, when the load indicator 106 and the radius indicator 107 point to the same position (are displayed so as to overlap), this means that the current load of the suspended load has reached the limit load. When the current load of the suspended load reaches the limit load, the control unit 15 outputs an appropriate control signal to the outside and restricts the movement of the jib 4.

[0064] In this way, during operation by the crane 1, when the load indicator 106 and the radius indicator 107 approach each other along the main axis X and point to the same position (overlap), the load of the current suspended load reaches the limit load. By checking the movement of this indicator, the worker can intuitively grasp how much longer it will take to reach the limit load, or whether the limit load has been reached.

[0065] Furthermore, when the load indicator 106 and the radius indicator 107 approach each other to a certain extent (more specifically, when the current load reaches a value equal to or greater than a certain percentage of the limit load), the control unit 15 causes the status display 102 to display a display notifying the same effect (for example, the characters "Warning") When the load indicator 106 and the radius indicator 107 indicate the same position (more specifically, when the current load reaches the limit load), the control unit 15 restricts the movement of the jib 4 and causes the status display 102 to display a display notifying the same effect (for example, the characters "Closed").

[0066] In addition, the current load, working radius and limit load are also displayed numerically (load display 108, radius display 109 and limit load display 110), so that by checking the desired numerical value, accurate values ​​can be ascertained as necessary.

[0067] Next, the numerical measurement screen 200 will be described. The numerical measurement screen 200 shown in Fig. 4 is a screen capable of displaying the load of a suspended load and the working radius of the suspended load using numerical values. The numerical measurement screen 200 mainly displays a button display 101, a status display 102, a message display 103, a load display 204, a radius display 205, and a limit load display 206.

[0068] The button display 101, status display 102, and message display 103 on the numerical measurement screen 200 are generally similar to the button display 101, status display 102, and message display 103 on the meter measurement screen 100 (see FIG. 3), and therefore will not be described.

[0069] The load display 204 displays the current load of the suspended load as a numerical value. The load display 204 is displayed slightly above the center of the display unit 11. The control unit 15 causes the load of the suspended load detected by the main winding load cell 12 or the auxiliary winding load cell 13 to be displayed as a numerical value on the load display 204. The example in Fig. 4 shows an example of the load of the suspended load detected by the main winding load cell 12, and the word "main winding" is displayed above the load display 204 to indicate this.

[0070] The radius display 205 displays the current working radius of the suspended load as a numerical value. The radius display 205 is displayed slightly below the center of the display unit 11 (below the load display 204). The control unit 15 calculates the working radius based on the inclination angle α of the jib 4 detected by the angle meter 14, and causes the radius display 205 to display the calculated working radius as a numerical value.

[0071] The limit load display 206 displays the limit load (allowable load) at the current working radius as a numerical value. The limit load display 206 is displayed at the bottom (below the radius display 205) of the display unit 11. The control unit 15 calculates the limit load based on the current working radius and moment curve, and causes the limit load display 206 to display the limit load as a numerical value.

[0072] Next, the display mode of the above-mentioned numerical measurement screen 200 will be described.

[0073] As described above, the current load, working radius, and limit load are displayed as numerical values ​​(load display 204, radius display 205, and limit load display 206) on the numerical measurement screen 200. In particular, on the numerical measurement screen 200, the display size of the numerical values ​​of the load display 204, etc. is set larger than the display size of the numerical values ​​of the load display 108, etc. on the meter measurement screen 100 (see FIG. 3). Therefore, on the numerical measurement screen 200, the numerical values ​​of the load, etc. are easy to visually confirm, and therefore the accurate values ​​of the load, etc. can be easily grasped.

[0074] Next, a description will be given of the moment curve display screen 300. The moment curve display screen 300 shown in Fig. 5 and Fig. 6 is a screen capable of displaying moment curves stored in the control unit 15. On the moment curve display screen 300, a button display 101, a status display 102, a load display 304, a moment curve display 305, and a sample set value display 306 are mainly displayed.

[0075] The button display 101 and the status display 102 of the moment curve display screen 300 are generally similar to the button display 101 and the status display 102 of the meter measurement screen 100 and the like (see FIG. 3), and therefore a description thereof will be omitted.

[0076] The load display 304 displays the current load of the suspended load as a numerical value. The load display 304 is displayed at the top of the display unit 11. The control unit 15 causes the load of the suspended load detected by the main winding load cell 12 or the auxiliary winding load cell 13 to be displayed as a numerical value on the load display 304. The example in Fig. 5 shows an example of the load of the suspended load detected by the main winding load cell 12, and the word "main winding" is displayed to the left of the load display 304 to indicate this.

[0077] 5 displays the currently selected moment curve. The moment curve display 305 is displayed approximately in the center of the display unit 11. The moment curve display 305 displays the moment curve currently selected by the control unit 15.

[0078] Furthermore, on the moment curve display screen 300, by appropriately operating the button of the button display 101, the moment curve display 305 (see FIG. 5) can be switched to the sample set value display 306 (see FIG. 6).

[0079] The sample set value display 306 shown in Fig. 6 displays the sample set values ​​used to determine (calculate) the moment curve. In this embodiment, the sample set value means a combination of a numerical value of the working radius and a numerical value of the limit load (allowable load) at that working radius. As will be described in detail later, in this embodiment, the control unit 15 calculates the moment curve from a plurality of stored sample set values. The sample set value display 306 can display, in an order, the specific values ​​of the plurality of sample set values ​​that are the basis for calculating the moment curve displayed on the moment curve display 305 (see Fig. 5).

[0080] In this way, by displaying the moment curve on moment curve display screen 300, it is possible to confirm the contents of the moment curve stored in control unit 15. This makes it possible to compare, for example, the moment curve used in crane 1 with a moment curve obtained from the manufacturer of crane 1, and to confirm whether an appropriate moment curve is being used.

[0081] Furthermore, by appropriately operating the buttons of button display 101 on moment curve display screen 300, a plurality of moment curves stored in control unit 15 can be switched and displayed on display unit 11. This allows a desired moment curve to be displayed on display unit 11 and confirmed.

[0082] Next, a description will be given of the moment curve setting screen 400. The moment curve setting screen 400 shown in Fig. 7 is a screen on which a moment curve for calculating a limit load can be set. On the moment curve setting screen 400, mainly displayed are a button display 101 and a sample input value display 404.

[0083] In addition, the button display 101 of the moment curve setting screen 400 is generally similar to the button display 101 (see FIG. 3) of the meter measurement screen 100 and the like, and therefore a description thereof will be omitted.

[0084] The sample input value display 404 is for inputting sample setting values ​​used to determine (calculate) a moment curve. The sample input value display 404 is displayed approximately in the center of the display unit 11. The sample input value display 404 displays a plurality of sample setting values ​​(working radii and corresponding limit loads) in a state in which numerical values ​​can be input (changed). On the moment curve setting screen 400, the sample setting values ​​can be modified or newly input by appropriately operating the buttons of the button display 101.

[0085] The moment curve is determined according to the specifications of the crane 1, and a specific moment curve can be obtained from the manufacturer of the crane 1, etc. From the obtained moment curve, some sample setting values ​​can be extracted and input to the sample input value display 404.

[0086] The control unit 15 calculates a moment curve based on a plurality of sample setting values ​​input on the moment curve setting screen 400. In addition, the calculated moment curve can be stored (confirmed) in the control unit 15 by performing a predetermined operation with the button of the button display 101. An example of a method for calculating a moment curve will be described below with reference to FIG. 8.

[0087] The control unit 15 calculates a moment curve by approximating a plurality of sample set values ​​using a predetermined approximation function P=a / R+b. More specifically, the control unit 15 calculates a moment curve by approximating (two-point approximation) two adjacent (two-point) sample set values. FIG. 8 shows, as an example, four (four points) sample set values ​​(Rn, Pn)=(80,500), (100,500), (130,440), and (150,420). R (Rn) is the working radius, and P (Pn) is the limit load.

[0088] The coefficients a and b of the approximation function of two sample set values ​​(for example, between (X1, Y1) and (X2, Y2)) are calculated using the following equations (1) and (2). (1) When X1=X2 or Y1=Y2: a=0 b=Y1 (2) Other than the above: a = (Y1-Y2)·X1·X2 / (X2-X1) b = (X1 Y1 - X2 Y2) / (X1 - X2)

[0089] When the coefficients a and b are calculated according to the above formulas (1) and (2), the values ​​shown in Fig. 8(a) are obtained. By applying these coefficients a and b to the approximation function P=a / R+b, the moment curve shown in Fig. 8(b) can be calculated.

[0090] In this way, the control unit 15 can calculate a moment curve based on multiple sample set values ​​input on the moment curve setting screen 400. On the moment curve setting screen 400, sample set values ​​(for main winding) when the main hook 5 is used and sample set values ​​(for auxiliary winding) when the auxiliary hook 6 is used can be input. Furthermore, multiple patterns of sample set values ​​can be input for each of the main winding and auxiliary winding.

[0091] As described above, the display device 10 of the crane 1 according to this embodiment has the following features: A display unit 11; A first scale (radius scale 105) which is a reference indicating the working radius of the jib 4; A second scale (load scale 104) which is a reference scale indicating the load of the load lifted by the jib 4; A first pointer (radius pointer 107) that indicates the working radius of the jib 4 calculated from the inclination angle α of the jib 4 by pointing to the first scale; And a second pointer (load pointer 106) which indicates the load of the suspended load by pointing to the second scale, A control unit 15 capable of displaying on the display unit 11; Equipped with The control unit 15 The first scale and the second scale are displayed at positions corresponding to each other so that when the first indicator and the second indicator point to the same position, the second indicator indicates the limit load of the suspended load. With this configuration, the relationship between the working radius and the limit load can be easily understood. That is, by understanding the distance between the first and second pointers displayed on the display unit 11, it is possible to visually grasp how much longer it will take (how much larger the working radius should be) to reach the limit load.

[0092] In addition, the control unit 15 changing a display position of the first pointer on the first scale according to a detection result by an angle detection unit (angle meter 14) capable of detecting the tilt angle; The display position of the second pointer on the second scale is changed according to the detection result by a load detection unit (main winding load cell 12 and auxiliary winding load cell 13) capable of detecting the load of the suspended load. By configuring it in this way, the current working condition (the inclination angle of the jib 4 and the load of the suspended load) can be quickly grasped.

[0093] In addition, the control unit 15 The first scale is displayed along a circumference having a center at a predetermined point and with values ​​increasing toward one side in the circumferential direction (counterclockwise), The second scale is displayed along a circumference concentric with the first scale, and with values ​​increasing toward the other circumferential side (clockwise). With this configuration, the relationship between the working radius and the limit load can be easily understood. In other words, by displaying the first and second scales along the circumference (in a dial-like manner), the relationship between the working radius and the limit load can be easily and intuitively understood.

[0094] In addition, the control unit 15 The first scale and the second scale are made to correspond to each other based on a moment curve that represents the relationship between the working radius of the jib 4 and the limit load of the suspended load. With this configuration, the relationship between the working radius and the limit load can be properly understood. That is, the first scale and the second scale can be properly associated with each other based on the moment curve indicating the limit load, and thus the relationship between the working radius and the limit load can be properly understood.

[0095] In addition, the control unit 15 The moment curve is calculated based on a first sample value (R) of the working radius of the jib 4 and a second sample value (P) of the limit load of the suspended load relative to the first sample value. With this configuration, the moment curve can be easily used. That is, instead of using a strict moment curve, the moment curve is calculated from the first sample value and the second sample value, so that the moment curve can be easily used.

[0096] In addition, the control unit 15 The first scale and the second scale based on a plurality of types of moment curves can be switched and displayed on the display unit 11. With this configuration, the relationship between the working radius and the limit load can be grasped by using the first scale and the second scale based on a desired moment curve.

[0097] In addition, the control unit 15 The moment curve can be displayed on the display unit 11 (moment curve display screen 300). By configuring in this way, it is possible to check the moment curve.

[0098] In addition, the control unit 15 In addition to the first scale and the second scale, the limit load of the suspended load for the current working radius of the jib 4 can be displayed on the display unit 11. By configuring in this way, the limit load can be easily grasped.

[0099] As described above, the display device 10 of the crane 1 according to this embodiment has the following features: A display unit 11; a control unit 15 capable of displaying on the display unit 11 the limit load of the load for the working radius of the jib 4 calculated from the current inclination angle α of the jib 4 based on a moment curve representing the relationship between the working radius of the jib 4 and the limit load of the load hoisted by the jib 4; Equipped with The control unit 15 The moment curve can be displayed on the display unit 11. With this configuration, the moment curve can be checked. By checking the moment curve, it is possible to easily check whether an appropriate moment curve is being used, etc.

[0100] In addition, the display device 10 of the crane 1 is Further comprising an input unit (display unit 11 configured as a touch panel), The control unit 15 The moment curve can be modified or newly stored based on the input value from the input unit. Such a configuration can improve convenience, that is, it becomes possible to modify or newly register (store) a moment curve using the display device 10 without using an external device such as a personal computer.

[0101] In addition, the control unit 15 The moment curve can be modified or newly stored based on a first sample value (R) of the inclination angle α of the jib 4 or the working radius of the jib 4 input by the input unit and a second sample value (P) of the limit load of the suspended load relative to the first sample value. With this configuration, the moment curve can be easily modified or newly stored. In other words, since a strict moment curve is not used but a moment curve is calculated from the first sample value and the second sample value, the moment curve can be easily used.

[0102] The display unit and the input unit are configured as an integrated touch panel. Such a configuration can improve convenience. That is, since intuitive input operations can be performed while checking the display on the display unit 11, operations such as correcting the moment curve can be easily performed.

[0103] In addition, the control unit 15 The stored multiple moment curves can be switched and displayed. By configuring in this way, it is possible to easily check a plurality of moment curves.

[0104] In addition, the control unit 15 A first scale (radius scale 105) which is a reference indicating the working radius of the jib 4; A second scale (load scale 104) which is a reference scale indicating the load of the suspended load; A first pointer (radius pointer 107) that indicates the working radius of the jib 4 by pointing to the first scale; And a second pointer (load pointer 106) which indicates the load of the suspended load by pointing to the second scale, It is possible to display it on the display unit 11, The first scale and the second scale are displayed at positions corresponding to each other so that when the first indicator and the second indicator point to the same position, the second indicator indicates the limit load of the suspended load. By configuring in this manner, the relationship between the working radius and the limit load can be easily understood.

[0105] The main winding load cell 12 and the auxiliary winding load cell 13 according to this embodiment are one embodiment of a load detection section according to the present invention. The goniometer 14 according to this embodiment is one embodiment of an angle detection unit according to the present invention. Moreover, the radial scale 105 according to this embodiment is one embodiment of the first scale according to the present invention. Moreover, the load scale 104 according to this embodiment is an embodiment of a second scale according to the present invention. The radius pointer 107 according to this embodiment is one embodiment of a first pointer according to the present invention. The load indicator 106 according to this embodiment is one embodiment of a second indicator according to the present invention. Moreover, the sample set values ​​R and P according to this embodiment are embodiments of the first sample value and the second sample value according to the present invention, respectively. Moreover, the display unit 11 (touch panel) according to this embodiment is one embodiment of the display unit and input unit according to the present invention.

[0106] Below, a variation of the above embodiment will be described.

[0107] For example, in the meter measurement screen 100 according to the first embodiment (see FIG. 3), the scale is displayed along the main axis X extending on a circumference centered on a predetermined point. However, as in the meter measurement screen 100A according to a modified example (second embodiment) shown in FIG. 10, the scale (load scale 104 and radius scale 105) can also be displayed along the main axis X extending linearly.

[0108] In this way, the display form of the scale is not limited, and any shape can be used.

[0109] Also, for example, in the moment curve setting screen 400 (see FIG. 7) according to the first embodiment, the moment curve can be changed (modified) by inputting a sample setting value. In this case, it is also possible to display the moment curve before the change and the moment curve after the change so that they can be compared, as in the moment curve setting screen 400A according to a modified example (third embodiment) shown in FIG. 11. In this case, the control unit 15 temporarily stores the moment curve before the change and the moment curve after the change, and displays a moment curve comparison display 405 on the display unit 11 so that the two can be compared. For example, the control unit 15 can display two moment curves simultaneously on the display unit 11 as shown in FIG. 11, or can switch the display of the two moment curves by a predetermined operation so that they can be compared. The control unit 15 may also display the two moment curves superimposed on each other in a state in which the display manner of the two is different (a manner in which the two can be distinguished from each other), such as displaying one moment curve with a dashed line and the other with a solid line.

[0110] The operator can compare the moment curves before and after the change and select a more appropriate moment curve by appropriately operating the button of button display 101. Control unit 15 adopts the selected moment curve and deletes the memory of the moment curve that was not selected.

[0111] In this way, the control unit 15 according to the third embodiment: When the moment curve is corrected based on values ​​input through the input unit, the moment curve before correction and the moment curve to be corrected can be displayed for comparison. With this configuration, the moment curve can be appropriately corrected. That is, since the moment curves before and after correction can be compared, a more appropriate moment curve can be selected.

[0112] In the first embodiment, the sample setting values ​​are modified or newly input by operating the button display 101 on the moment curve setting screen 400 (see FIG. 7), and the control unit 15 calculates the moment curve based on the sample setting values, but the present invention is not limited to this.

[0113] For example, as a modified example (fourth embodiment), it is also possible to configure the moment curve and sample set values ​​to be input using an external device. For example, it is also possible to connect a personal computer (hereinafter simply referred to as a "personal computer") or various storage media (e.g., a USB memory or the like) to the display unit 11, and input information on the moment curve and sample set values ​​from the personal computer or the like to the display unit 11 (and thus the control unit 15).

[0114] When a moment curve is input, the control unit 15 can store the moment curve. When a sample setting value is input, the control unit 15 can calculate and store a moment curve from the sample setting value.

[0115] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0116] For example, in the above embodiment, an example was shown in which the working radius of the suspended load was displayed on the display unit 11, and a moment curve based on the working radius of the suspended load was used, but the present invention is not limited to this. That is, instead of the working radius, it is possible to display the tilt angle α of the jib 4 on the display unit 11, or to use a moment curve based on the tilt angle α (a graph showing the relationship between the tilt angle α and the limit load).

[0117] In the above embodiment, for example, as shown in Fig. 3, an example was given in which the limit load (allowable load) was displayed on the display unit 11, but for example, instead of the limit load (or together with the limit load), it is also possible to display the limit radius (or limit angle) on the display unit 11. Note that the limit load (limit angle) is the limit value of the working radius (or the angle of the jib 4) at which work can be performed for the weight of the load being hoisted by the crane 1.

[0118] In the above embodiment, the moment curve is calculated from the sample set values ​​using the above formulas (1) and (2), but the present invention is not limited to this. In other words, it is possible to calculate the moment curve using various other calculation formulas as long as they can calculate an appropriate moment curve based on the sample set values.

[0119] Also, in the above embodiment, an example has been shown in which a moment curve is determined (calculated) from several input sample set values, but, for example, it is also possible for the control unit 15 to automatically select the input sample set values ​​instead of the operator. For example, it is possible for the control unit 15 to learn appropriate selection conditions for the sample set values ​​by machine learning or the like, and to automatically select sample set values ​​based on the learning from moment curves obtained from the manufacturer of the crane 1 or the like. With such a configuration, it is possible to reduce the workload of the operator and make it easier to determine the moment curve.

[0120] Furthermore, the screen of the display unit 11 shown in the above embodiment (meter measurement screen 100, etc.) is just one example, and it is possible to display various other screens on the display unit 11 and to perform various operations using the display unit 11 (for example, various setting operations related to the crane 1, various setting operations related to the display of the display unit 11, etc.).

[0121] Furthermore, the configuration of the crane 1 shown in the above embodiment is just one example, and the present invention can be applied to various other cranes.

[0122] In the above embodiment, the display device 10 is equipped with the main winding load cell 12, the auxiliary winding load cell 13, and the angle meter 14, but the present invention is not limited to this. In other words, the display device 10 can also obtain information on the load of the suspended load and the inclination angle α of the jib 4 from the outside, and in such a case, the display device 10 itself does not necessarily need to be equipped with the main winding load cell 12, etc. [Explanation of symbols]

[0123] 1. Crane 4. Jib 10 Display device 11 Display section 12 Main winding load cell 13 Auxiliary winding load cell 14 Angle Meter 15 Control section 100 Meter Weighing Screen 104 Load scale 105 Radius Scale 106 Load guideline 107 Radius pointer

Claims

1. A display unit; A first scale indicating the inclination angle of the crane attachment or the working radius of the crane attachment; A second scale serving as a reference indicating the load of the load lifted by the crane attachment; a first pointer indicating the tilt angle of the crane attachment or a working radius of the crane attachment calculated from the tilt angle of the crane attachment by pointing to the first scale; And a second pointer indicating the load of the suspended load by pointing to the second scale, A control unit capable of causing the display unit to display; Equipped with The control unit is The first scale is displayed along a linearly extending main axis and with increasing values ​​toward one side of the main axis direction; The second scale is displayed along the major axis and in such a way that the value increases toward the other side of the major axis direction; When the first indicator and the second indicator point to the same position, the first scale and the second scale are displayed at positions corresponding to each other so that the second indicator indicates the limit load of the suspended load. Crane display device.

2. A display unit; A first scale indicating the inclination angle of the crane attachment or the working radius of the crane attachment; A second scale serving as a reference indicating the load of the load lifted by the crane attachment; a first pointer indicating the tilt angle of the crane attachment or a working radius of the crane attachment calculated from the tilt angle of the crane attachment by pointing to the first scale; And a second pointer indicating the load of the suspended load by pointing to the second scale, A control unit capable of causing the display unit to display; Equipped with The control unit is When the first indicator and the second indicator point to the same position, the first scale and the second scale are displayed at positions corresponding to each other so that the second indicator indicates the limit load of the suspended load, Corresponding the first scale and the second scale to each other based on a moment curve that represents a relationship between the tilt angle of the crane attachment or the working radius of the crane attachment and the limit load of the suspended load; The first scale and the second scale based on a plurality of types of the moment curves can be switched and displayed on the display unit. Crane display device.

3. The control unit is The main shaft is configured to be switchable from extending linearly to extending circumferentially around a predetermined point. The display device for a crane according to claim 1.

4. The control unit is changing a display position of the first pointer on the first scale in accordance with a detection result by an angle detection unit capable of detecting the tilt angle; changing a display position of the second pointer on the second scale according to a detection result by a load detection unit capable of detecting a load of the suspended load; The display device for a crane according to any one of claims 1 to 3.

5. The control unit is The first scale and the second scale are associated with each other based on a moment curve that represents a relationship between the tilt angle of the crane attachment or the working radius of the crane attachment and the limit load of the suspended load. The display device for a crane according to claim 1 or 3.

6. The control unit is Calculating the moment curve based on a first sample value of the tilt angle of the crane attachment or the working radius of the crane attachment and a second sample value of the limit load of the suspended load relative to the first sample value; The display device for a crane according to claim 5.

7. The control unit is The first scale and the second scale based on a plurality of types of the moment curves can be switched and displayed on the display unit. The display device for a crane according to claim 5 or 6.

8. The control unit is The moment curve can be displayed on the display unit. The display device for a crane according to any one of claims 5 to 7.

9. The control unit is In addition to the first scale and the second scale, the display unit can display the limit load of the load relative to the current tilt angle of the crane attachment or the working radius of the crane attachment. The display device for a crane according to any one of claims 1 to 8.

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