Winch drum monitoring device and crane

Abstract

To monitor the wear state of a winch drum.SOLUTION: A monitoring device of a winch drum 361 includes: monitoring means (611, 628) for monitoring whether or not a wear occurrence condition is satisfied for the winch drum 361; and notification means 622 for performing notification on the basis of the establishment of the wear occurrence condition. For example, the monitoring means may monitor the state of layer rows of a wire rope 32 wound on the winch drum 361 and may also use as the wear occurrence condition in a case where a first layer of the wire rope 32 wound on the winch drum 361 is used, or in a case where the amount of movement of the wire rope 32 used at a position of a drum flange 363 of the winch drum 361 satisfies a certain condition.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a winch drum monitoring device. and Crane Regarding. [Background technology]

[0002] In a work machine that winds and unwinds a wire using a winch drum such as a crane, the winch drum has conventionally been photographed with a camera to notify an operator of the occurrence of irregular winding (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-1163 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned conventional monitoring device only notifies the operator of the occurrence of irregular winding, and is not capable of informing the operator of the occurrence or extent of wear on the winch drum caused by the repeated movement of the wire back and forth.

[0005] The present invention aims to monitor the wear condition of a winch drum. [Means for solving the problem]

[0006] The present invention relates to A monitoring device for a winch drum of a crane, comprising: A predetermined Wear is expected to occur A monitoring means for monitoring whether or not a wear occurrence condition is satisfied; and a notification means for issuing a notification based on the establishment of the wear occurrence condition. Another invention is: A crane, The winch drum is monitored by the monitor. Effect of the Invention

[0007] According to the present invention, it is possible to effectively monitor the wear condition of the winch drum. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view of a crane equipped with a winch drum monitoring device according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a block diagram showing the configuration of a crane control device and its surroundings. [Diagram 3] FIG. 4 is an explanatory diagram showing a specific embodiment of a measuring unit. [Figure 4] 13 is a diagram showing an example of a screen displaying operation information such as various set values ​​and detected values ​​of a crane. [Diagram 5] 13 is a flowchart showing a monitoring process performed by a monitoring processing unit. [Figure 6] FIG. 2 is a block diagram showing a configuration of a crane information management system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Crane overview] FIG. 1 is a side view of a crane, which is a working machine equipped with a winch drum monitoring device according to an embodiment of the present invention. Crane 1 is a so-called mobile crawler crane. In describing crane 1, the forward direction of the vehicle is referred to as "front", the backward direction as "rear", and when facing forward, the left hand side is referred to as "left" (the far side of the paper in Fig. 1) and the right hand side is referred to as "right" (the near side of the paper in Fig. 1). In addition, it comprises a lower running body 2 that travels and an upper rotating body 3 that rotates on it, but unless otherwise specified, the directions of each part will be described assuming that the lower running body 2 and the upper rotating body 3 are in the same fore-and-aft direction (standard position) as a general rule.

[0010] As shown in FIG. 1, the crane 1 is composed of a self-propelled crawler-type lower running body 2, an upper rotating body 3 rotatably mounted on the lower running body 2, and a boom 4 attached to the front side of the upper rotating body 3 so that it can be raised and lowered.

[0011] The lower traveling body 2 includes a main body 21 and crawlers 22 provided on both the left and right sides of the main body 21. The left and right crawlers 22 are each rotationally driven by a traveling hydraulic motor (not shown).

[0012] A boom 4 is attached so as to be capable of being raised and lowered on the front side of the upper rotating body 3. A sheave 43 that guides a hoisting rope 32 serving as a wire rope is rotatably attached to the upper end of the boom 4. Further, a lower end portion of a mast 31 is supported on the upper rotating body 3 rearward of the boom 4. The upper rotating body 3 is driven to rotate about an axis in the vertical direction relative to the lower traveling body 2 by a hydraulic motor for rotation (not shown).

[0013] A counterweight 5 for balancing the weight of the boom 4 and the suspended load L is attached to the rear of the upper rotating body 3. The number of counterweights 5 can be increased or decreased as required.

[0014] A hoisting winch 42 for raising and lowering the boom 4 is disposed near the counterweight 5, and in front of it is a hoisting winch 36 for winding and unwinding the hoisting rope 32. The hoisting winch 36 winds and unwinds the hoisting rope 32 using a hoisting hydraulic motor (not shown), and raises and lowers the hook 34 and the suspended load. In addition, a cab 33 is disposed on the right front side of the upper rotating body 3.

[0015] The mast 31 is equipped with an upper spreader 35 at its upper end, and the upper spreader 35 is connected to one end of a pendant rope 44 whose other end is connected to the upper end of the boom 4. A lower spreader (not shown) is provided below the upper spreader 35, and when a hoisting rope 37 serving as a wire rope wound multiple times between them is wound or unwound by a hoisting winch 42, the distance between the upper spreader 35 and the lower spreader changes, causing the boom 4 to hoist. The hoisting winch 42 is driven by a hoisting hydraulic motor (not shown).

[0016] [Crane control system] A control device 60 for the crane 1 is provided in the cab 33 of the upper rotating body 3. Fig. 2 is a block diagram showing the configuration of the control device 60 and its surroundings. The control device 60 is a control terminal mounted on the crane 1, and in addition to controlling various operations of the crane 1 such as traveling, rotation, and winding and unwinding of the hoisting rope 32, it also monitors the winding and unwinding of the hoisting rope 32 by the hoisting winch 36. The control device 60 includes a controller 61 including an arithmetic processing device having a CPU, memory devices such as ROM and RAM, and other peripheral circuits. The controller 61 includes software modules of a monitoring processing unit 611 that performs monitoring processing of winding and unwinding of the hoisting rope 32, which will be described later, and a transmission processing unit 612 that outputs operation information of the crane to the outside. The monitoring processing unit 611 and the transmission processing unit 612 may be configured from hardware.

[0017] An input unit 621 , a display unit 622 , an operating lever 624 , a memory 625 , a transmitting unit 626 , and a receiving unit 627 are connected to the controller 61 , which constitute the control device 60 . Furthermore, a load cell 631 , a boom angle sensor 632 , a rotation amount sensor 633 , a control valve 635 , and a measurement unit 628 are connected to the controller 61 .

[0018] The monitoring processing unit 611 and the measuring unit 628 function as a monitoring means for monitoring whether or not a predetermined wear occurrence condition is satisfied for the winch drum 361 of the hoisting winch 36. The monitoring means and the transmission processing unit 612 constitute a monitoring device for the winch drum. The functions of the monitoring processor 611 and the transmission processor 612 will be described in detail later.

[0019] The input unit 621 is provided inside the cab 33, and is an input interface such as a touch panel, which outputs a control signal corresponding to an operation by an operator to the controller 61. The operator can operate the input unit 621 to input the length of the boom 4, the weight of the suspended load, and various other settings and various inputs required for operation. The display device 622 is provided in the cab 33 and includes, for example, a touch panel display that is also used as the input unit 621, and displays information such as the weight of the load, the boom angle, and the rotation angle of the upper rotating body 3 on the display screen based on a control signal output from the controller 61 (see FIG. 4). The display device 622 also functions as a notification means that notifies the user by displaying information via the monitoring processing unit 611, which will be described later.

[0020] The operation lever 624 is provided inside the cab 33 and is used, for example, to manually input operations for causing the crane 1 to perform various operations, and to input a control signal corresponding to the amount of operation of the operation lever 624 to the controller 61 . For example, the operating lever 624 can perform operation inputs for the traveling operation of the lower traveling body 2, the rotating operation of the upper rotating body 3, the raising and lowering operation of the boom 4, and the winding and unwinding of the hoisting rope 32 by the hoisting winch .

[0021] The transmitter 626 and the receiver 627 are wireless communication devices that transmit and receive wirelessly to and from an external communication base station 150 (see FIG. 6) described later, and communicate information with an external communication network via the communication base station 150.

[0022] The load cell 631 is attached to the upper spreader 35, detects the tension acting on the pendant rope 44 that raises and lowers the boom 4, and outputs a control signal corresponding to the detected tension to the controller 61.

[0023] The boom angle sensor 632 is attached to the base end side of the boom 4, detects the hoisting angle of the boom 4 (hereinafter also referred to as the boom angle), and outputs a control signal corresponding to the detected boom angle to the controller 61. The boom angle sensor 632 detects, for example, a ground angle, which is an angle with respect to the horizontal plane, as the boom angle.

[0024] The turning amount sensor 633 is attached between the lower traveling body 2 and the upper rotating body 3, detects the turning angle of the upper rotating body 3, and outputs a control signal corresponding to the detected turning angle to the controller 61. The turning amount sensor 633 detects, for example, an angle around a vertical axis as the turning angle.

[0025] The control valve 635 is composed of a plurality of valves that can be switched in response to a control signal from the controller 61 . For example, the control valve 635 includes a valve that controls the rotational drive of the left and right crawlers 22 of the lower running body 2, a valve that controls the rotational movement of the upper rotating body 3, a valve that controls the rotational drive of the hoisting winch 42, and a valve that controls the rotational drive of the hoisting winch 36.

[0026] The measuring unit 628 detects the layer arrangement state of the hoisting rope 32 wound around the winch drum 361 of the hoisting winch 36. FIG. The layer arrangement of the hoisting rope 32 refers to the number of layers and rows of the hoisting rope 32 that are wound around the winch drum 361 in layers. The hoisting rope 32 at a position where it leaves the state where it is wound around the winding section 362 of the winch drum 361 is referred to as the "wire rope unwinding portion." Therefore, the layer sequence state of the hoisting rope 32 indicates which layer and which row the unwinding portion of the hoisting rope 32 is in.

[0027] That is, as shown in Fig. 3, the winch drum 361 has a winding section 362 around which the hoisting rope 32 is wound, and two brim-shaped drum flanges 363 provided at both ends of the winding section 362. The hoisting rope 32 is wound in order around the winding section 362 of the winch drum 361 from one drum flange 363 side to the other drum flange 363 side, and this is repeated to form a layer. In other words, the number of layers of the hoisting rope 32 up to the outermost side is the "number of layers" in the "layer sequence state". Also, the number of turns of the outermost hoisting rope 32 wound from the end is the "number of rows" in the "layer sequence state".

[0028] When winding the hoisting rope 32 around the winch drum 361, one layer of the hoisting rope 32 is wound between one drum flange 363 side and the other drum flange 363 side, and in the next layer, the hoisting rope 32 turns around and one layer of the hoisting rope 32 is wound between the other drum flange 363 side and the one drum flange 363 side, and by repeating this alternately, multiple layers of the hoisting rope 32 are wound. Therefore, in odd-numbered layers of the hoisting rope 32, the first row is on one drum flange 363 side (the left drum flange 363 in the example of Figure 3), and in even-numbered layers, the first row is on the other drum flange 363 side (the right drum flange 363 in the example of Figure 3).

[0029] After the hoisting rope 32 has been wound onto the winch drum 361 in this manner, the measurement unit 628 detects the amount of rotation (rotation angle) of the winch drum 361 using, for example, a laser light scanning distance measuring device 629 such as LiDAR and a rotation amount detection device 630 such as a potentiometer. The distance measurement device 629 is not limited to a laser light scanning type such as LiDAR, and other sensors, cameras, etc. capable of detecting the distance to the wound hoisting rope 32 can also be used. Similarly, the rotation amount detection device 630 is not limited to a potentiometer, and any sensor capable of detecting the amount of rotation of the winch drum 361 can be used.

[0030] 3, the distance measuring device 629 performs laser scanning within a plane including the central axis of the winch drum 361 from the outer side in the rotational radial direction of the winch drum 361 toward the inner side in the radial direction, and measures the distance to the hoisting rope 32 exposed on the surface side between one drum flange 363 and the other drum flange 363. From the measurement result, the axial cross-sectional shape of the winch drum 361 is measured, and the layer arrangement state of the hoisting rope 32 wound around the winch drum 361 can be detected.

[0031] For example, as shown in FIG. 3, when the outermost layer of the hoisting rope 32 is wound to the end, the distance measuring device 629 measures that the distance from the distance measuring device 629 to the surface of the hoisting rope 32 is approximately uniform between one drum flange 363 and the other drum flange 363. Therefore, based on the above measurement results, the number of layers of the hoisting rope 32 can be obtained from the distance from the distance measuring device 629 to the surface of the wound hoisting rope 32. Furthermore, since the obtained distances are almost uniform, it is determined that the winding rope 32 is wound exactly to the end (the maximum number of rows in one layer).

[0032] In addition, when the hoisting rope 32 is wound partway on the outermost layer, when the distance measuring device 629 is used to measure the distance from the distance measuring device 629 to the surface of the hoisting rope 32 between one drum flange 363 and the other drum flange 363, a step is found to be present partway along the way. Therefore, based on the above measurement results, the number of layers of the hoisting rope 32 can be obtained from the distance from the distance measuring device 629 to the surface of the wound hoisting rope 32 (the closer distance across the step). Moreover, the number of rows is obtained by dividing the distance from one or the other drum flange 363 to the step by the width (outer diameter) of the hoisting rope 32.

[0033] In addition, as will be described in detail later, the monitoring processing unit 611 performs a process of accumulating the total amount of winding and unwinding (the length of the hoisting rope) performed during the operation in a specific layer or row of the hoisting rope 32. The rotation amount detection device 630 can detect the amount of rotation (change in the rotation angle) from the origin of the winch drum 361. This allows the amount of winding or unwinding of the hoisting rope 32 for a specific number of layers or rows to be determined.

[0034] [Winch drum monitoring process] The monitoring processing unit 611 cooperates with the above-mentioned measuring unit 628 to monitor whether or not a predetermined wear occurrence condition for the winch drum 361 is established. The winch drum 361 has certain parts that are subject to strong friction with the hoisting rope 32 during winding and unwinding operations and are prone to wear. As shown in FIG. 3, in any row a of the first layer (innermost layer), when the hoisting rope 32 is wound or unwound, the hoisting rope 32 rubs directly against the outer circumferential surface of the winding portion 362 of the winch drum 361, easily causing wear. In addition, when the hoisting rope 32 is wound or unwound at the drum flange position of the winch drum 361, i.e., the first row (row b) of all layers (including the first layer), it is likely to rub directly against the drum flange 363, causing wear.

[0035] Therefore, the monitoring processing unit 611 determines that the wear occurrence condition is met when the first layer (innermost layer) of the hoisting rope 32 on the winch drum 361 is wound up or unwound. The monitoring processor 611 also defines a condition related to the flange adjacent movement amount, which is the amount of movement of the hoisting rope 32 at a position adjacent to the drum flange 363, as the wear occurrence condition. More specifically, when the ratio of the integrated value (flange adjacent movement amount) of the movement amount (winding length and unwinding length) of the hoisting rope 32 in the row b of each layer to the integrated value (total movement amount of the hoisting rope 32) of the overall winding length and unwinding length of the winch drum 361 exceeds a certain value (threshold value), it is determined that the wear occurrence condition is established. In this case, the integration is performed individually for each row b of each layer, and it is determined whether or not each integrated value exceeds the threshold value. Furthermore, the integration is not distinguished between the winding direction and the unwinding direction, and the absolute values ​​of the winding length and the unwinding length are integrated.

[0036] The above-mentioned wear occurrence condition (condition related to the flange adjacent movement amount, which is the movement amount of the hoisting rope 32 in row b of each layer) is not limited to the ratio of the flange adjacent movement amount to the total movement amount of the hoisting rope 32 exceeding a threshold value, but may also be the ratio of the flange adjacent movement amount to a certain period or a certain movement amount exceeding a threshold value.

[0037] When any of the above wear occurrence conditions is satisfied, the monitoring processing unit 611 executes a notification process. The notification process, for example, causes the display device 622 to display a notification icon to notify the operator of the occurrence of wear of the winch drum 361.

[0038] 4 shows an example of a display screen G on the display device 622 that displays operation information such as various set values ​​and detected values ​​of the crane 1. This display screen G is constantly displayed when the crane 1 is in use. Within two specified frames on the display screen G, a first icon N1 is displayed, which indicates that the wear occurrence condition is met when winding or unwinding is performed in the first layer, and a second icon N2 is displayed, which indicates that the wear occurrence condition is met when the integrated value of the winding length and unwinding length in the first row exceeds a threshold value. The first icon N1 represents a winch drum 361, and the number "1" indicating the first layer is written within the icon. The second icon N2 represents a winch drum 361, and an indication of the strong rubbing state with the drum flange 363 is written alongside the icon.

[0039] The display method of these icons N1 and N2 is not limited to displaying them only when the wear-out condition is satisfied. For example, the icons N1 and N2 may be displayed normally, and when the wear-out condition is satisfied, the icon or background may be brightened or the color may be changed, the icon may flash, the icon may be enlarged, or any other display method may be used that allows visual recognition of the satisfaction of the wear-out condition.

[0040] Further, below the display frames of the above-mentioned icons N1 and N2 in the display screen G, a layer sequence information display section W is provided which displays layer sequence information indicating which row and layer the unwound portion of the hoisting rope 32 currently being wound or unwound onto the winch drum 361 is in, regardless of whether the wear occurrence condition is met. The layer sequence information display section W also displays the total number of rows wound in one layer next to the number of rows based on the measurement.

[0041] The notification process is not limited to display by the display device 622, but may be any means that can be recognized by the operator, such as display by a notification lamp or audio output by an audio output unit.

[0042] 5 is a flowchart showing the monitoring process performed by the monitoring processor 611. The monitoring process will be specifically described with reference to this flowchart. Note that the process of this flowchart is repeatedly executed by the monitoring processor 611 at a minute cycle time determined in advance.

[0043] The monitoring processing unit 611 controls the distance measuring device 629 to measure the distance to the winch drum 361 by laser scanning (step S1). Then, based on the measurement result, the layer sequence information of the hoisting rope 32 currently wound around the winch drum 361 is obtained (step S3). Furthermore, it is determined from the layer row information whether or not the hoisting rope 32 is currently being wound up or unwound in the first row of any of the layers of the winch drum 361 (step S5).

[0044] As a result, if it is determined in step S5 that the hoisting rope 32 is being wound or unwound in the first row, the monitoring processing unit 611 accumulates the amount of winding or unwinding of the hoisting rope 32 in the first row using the rotation amount detection device 630 (step S7), and proceeds to step S9. As described above, the monitoring process is repeatedly executed at a predetermined minute cycle time, so the amount of change from the detection by the rotation amount detection device 630 in the previous monitoring process is found and the absolute value is integrated. In addition, the integrated value is found individually for each layer, so addition is performed on the integrated value for the corresponding layer.

[0045] On the other hand, if it is determined that the hoisting rope 32 is not being wound or unwound in the first row, or after adding the integrated value in step S7, the monitoring processing unit 611 determines whether the ratio of the integrated value (flange adjacent movement amount) of the winding or unwinding amount of the hoisting rope 32 in the first row to the current total movement amount of the hoisting rope 32 exceeds a threshold value (step S9). As a result, if it is determined that the ratio of the integrated values ​​of the winding amount and the unwinding amount is equal to or less than the threshold value, the process proceeds to step S13, where it is determined whether the winding or unwinding of the hoisting rope 32 is being performed in the first layer. On the other hand, if it is determined that the integrated value of the winding amount and the unwinding amount exceeds the threshold value, a notification process is executed and the second icon N2 is displayed on the display device 622 (step S11).

[0046] Next, the monitoring processing unit 611 determines from the layer sequence information whether or not the hoisting rope 32 is currently being wound or unwound on the first layer of the winch drum 361 (step S13). As a result, if it is determined that the hoisting rope 32 is not being wound or unwound in the first layer, the monitoring process is terminated, and if it is determined that the hoisting rope 32 is being wound or unwound in the first layer, an alarm process is executed and the first icon N1 is displayed on the display device 622 (step S15). Then, the monitoring process ends.

[0047] [Transmission process] A description will be given of the transmission process performed by the transmission processing unit 612. The transmission processing unit 612 controls the above-mentioned transmission unit 626, and transmits and outputs the operation information of the crane 1 to the outside of the crane 1. The transmission processing unit 612 outputs the operation information to the outside periodically, for example. The period is, for example, one day, but is not limited to this and can be increased or decreased as desired. The period may also be set as desired.

[0048] The operation information of the crane 1 that the transmission processing unit 612 outputs to the outside includes, for example, information on the monitoring process, information on the working conditions of the crane 1, information on the work content of the crane 1, and the like.

[0049] Information regarding the monitoring process (information related to the wear occurrence conditions) may include, for example, the following items accumulated within one period of the output cycle (one day in the above example): (1) the number of alerts for winding or unwinding the first layer, (2) the execution time of the alert, (3) the accumulated amount of winding and unwinding during the execution time of the alert (the period during which the wear occurrence conditions are met), (4) the number of alerts for winding or unwinding the first row, (5) the execution time of the alert, and (6) the accumulated amount of winding and unwinding during the execution time of the alert (the period during which the wear occurrence conditions are met).

[0050] In addition, the information may be information related to the monitoring process by dividing the range of the line pull of the crane 1 described later into a number of ranges and obtaining the values ​​of the above items (1) to (6) for each line pull range. This makes it possible to obtain information showing the distribution of the magnitude of the line pull when an alarm is generated for winding or unwinding the first layer or when an alarm is generated for winding or unwinding the first row (the period when the wear generation condition is satisfied). Furthermore, for the items (4) to (6) within one period of the output cycle, the values ​​of the above items may be calculated for each layer and used as information regarding the monitoring process.

[0051] The information on the working conditions of the crane 1 includes the length of the boom 4, the number of hoisting ropes 32 hung, and the like. Information related to the work performed by the crane 1 includes the maximum line pull value and maximum working radius recorded by the crane 1. The line pull is the value obtained by dividing the load applied to the hoisting rope 32 by the number of loops of the hoisting rope 32. The maximum working radius is the maximum radius in a plan view calculated from the boom length and the tilt angle during work. These are also pieces of information related to the frictional force between the wire rope and the drum.

[0052] The transmission processing unit 612 accumulates the operation information consisting of the above items for one period of the above output cycle (one day in the above example), and outputs it to the outside when the output cycle arrives.

[0053] 6 is a block diagram showing the configuration of an information management system 100 for the crane 1. As shown in FIG.

[0054] The management server 50 is connected to a network 130 such as a general public line network. In addition to the management server 50, a communication base station 150, an information terminal 70, and the like are connected to the network 130. The management server 50 can transmit and receive data to and from the communication base station 150, the control device 60 of the crane 1, and the external information terminal 70, all of which are connected to the network 130.

[0055] The communication base station 150 is, for example, a base station for a mobile phone communication line. When the communication base station 150 receives data on the operation information of the crane 1 that is output to the outside by the transmission processing unit 612 of the control device 60 of the crane 1 through the transmission unit 626, the communication base station 150 transmits the data to the management server 50 via the network 130.

[0056] A crane operation information database 140 and an information destination database 160 that records destinations of operation information are connected to the management server 50. The management server 50 stores data of operation information received from the control device 60 of the crane 1 in the operation information database 140. Furthermore, the management server 50 transmits the data of the operation information stored in the operation information database 140 to the information terminal 70 via the network 130. The management server 50 determines the destination of the information based on the contents of the information destination database 160. The operation information data may be transmitted only when requested by the information terminal 70 side.

[0057] In this way, the data of the operation information outputted to the outside by the transmission processing unit 612 of the control device 60 of the crane 1 is provided to a manager or the like who uses the external information terminal 70. The information management system 100 that provides the data of the operation information is merely an example and is not limited to the above. For example, the management server 50 may be omitted and the data of the operation information may be provided directly to the preregistered information terminal 70 via the network 130.

[0058] [Technical Effects of the Invention Embodiments] As described above, the controller 61 of the control device 60 of the crane 1 is equipped with a monitoring processing unit 611 that monitors whether or not the wear occurrence condition for the winch drum 361 has been met, and a display device 622 that issues an alert based on the meeting of the wear occurrence condition. This allows the operator to clearly recognize the wear state that may occur due to the hoisting rope 32 on the winch drum 361.

[0059] In the above embodiment, the wear occurrence conditions are exemplified as fixed conditions whose contents do not change. However, the wear occurrence conditions may be conditions that gradually learn and are automatically updated by incorporating a reinforcement learning function.

[0060] In addition, since the monitoring processing unit 611 monitors the layer sequence state of the hoisting rope 32 wound around the winch drum 361, it is possible to more easily recognize the occurrence of wear that may occur in the hoisting rope 32 without directly measuring the wear that has occurred on the winch drum 361.

[0061] The wear occurrence conditions are not limited to conditions under which wear is expected to occur, as exemplified in the embodiment, but may be conditions determined, for example, by directly measuring the amount of wear on the hoisting rope 32 at the winch drum 361 and judging from the measured value.

[0062] In addition, the wear occurrence conditions determined by the monitoring processing unit 611 include conditions that are met when the first layer of the hoisting rope 32 wound around the winch drum 361 is being used, so it is possible to predictively detect wear occurring on the outer periphery of the winding portion 362 of the winch drum 361 and make the operator aware of it, without directly measuring the wear occurring on the winch drum 361.

[0063] In addition, another wear occurrence condition determined by the monitoring processing unit 611 is a condition related to the flange adjacent movement amount, which is the amount of movement of the hoisting rope 32 at a position adjacent to the drum flange 363. Therefore, even if the wear occurring on the winch drum 361 is not directly measured, it is possible to predictively detect wear occurring on the drum flange 363 of the winch drum 361 and make the operator aware of it.

[0064] The conditions regarding the flange adjacent movement amount are not limited to those exemplified in the embodiment, and may be that the ratio of the flange adjacent movement amount to a certain period or a certain movement amount exceeds a threshold value, or that the total amount of the flange adjacent movement amount exceeds a threshold value.

[0065] In addition, the controller 61 is equipped with a transmission processing unit 612 that accumulates crane operation information including information indicating the distance traveled by the hoisting rope 32 during the period when the wear occurrence condition of the winch drum 361 is satisfied, the alarm time, and the distribution of the magnitude of the line pull. This makes it possible to later analyze the status of the crane 1 when the wear occurrence condition is satisfied, and to take measures against the occurrence of wear.

[0066] In addition, the transmission processing unit 612 divides the crane operation information into multiple categories and accumulates information related to wear-out conditions for each category of operation information, making it possible to analyze in more detail the status of the crane 1 when the wear-out conditions are met. Specifically, when a condition related to the flange adjacent movement amount is set as the wear occurrence condition, the numerical range of the line pull is divided into a plurality of ranges as load information related to the load acting on the hoisting rope 32, and the flange adjacent movement amount is accumulated for each load information category. This makes it possible to grasp the magnitude of the line pull when wear occurs due to the flange adjacent movement, and to analyze in more detail the state of the crane 1 when the wear occurrence condition is established.

[0067] Although a line pull has been given as an example of a load acting on the hoisting rope 32, the line pull can also be called a load acting on a drum, and when we say "load acting on the hoisting rope (wire rope)," we also include the load acting on the winch drum. Further, instead of dividing by the line pull value as in the above embodiment, the flange adjacent movement amount may be accumulated by dividing by crane work, lifting work, excavation work, and the like.

[0068] In addition, the transmission processing unit 612 outputs the accumulated crane operation information to outside the crane, so that not only the operator operating the crane 1 but also external managers, etc. can analyze the status of the crane 1 when wear occurrence conditions are met and take measures to prevent wear occurrence.

[0069] Furthermore, the monitoring processing unit 611 displays, on the display device 622, a layer sequence display showing which layer and which row the unwound portion of the hoisting rope 32 wound around the winch drum 361 is in, together with the display screen when the wear occurrence condition is met. This allows the worker to recognize the association between the occurrence of wear and the position of the unwound portion.

[0070] Furthermore, when the unwound portion of the hoisting rope 32 becomes the first layer, the monitoring processing unit 611 displays, on the display device 622, a first icon N1 indicating that it has become the first layer, in addition to the layer sequence display. Therefore, it becomes possible for the worker to clearly recognize the occurrence of wear due to use of the first layer.

[0071] [others] The details shown in the above embodiment of the invention can be modified as appropriate without departing from the spirit of the invention. For example, the measuring unit 628 is configured to include the distance measuring device 629 and the rotation amount detecting device 630, but is not limited to this. For example, the rotation amount detection device 630 may be omitted from the measurement unit 628. The distance measurement device 629 can easily obtain layer sequence information of the hoisting rope 32 wound around the winch drum 361. Furthermore, since the position of the row of the hoisting rope 32 currently being wound or unwound changes slightly during one rotation, the distance measurement device 629 detects the change, and thus it is possible to determine the approximate degree of rotation of the current row of the hoisting rope 32. Therefore, since the distance measurement device 629 can also obtain the amount of movement of the hoisting rope 32 when the wear occurrence condition is established, the measurement unit 628 may be configured to exclude the rotation amount detection device 630.

[0072] Moreover, the measuring unit 628 may be configured such that the distance measuring device 629 is omitted. For example, when the outer diameter of the hoisting rope 32, the outer diameter of the winding portion 362 of the winch drum 361, the distance between the two drum flanges 363, etc. are known values, it is possible to obtain layer sequence information of the hoisting rope 32 currently being wound or unwound from the total amount of rotation of the winch drum 361 from a reference position (for example, the position of the winch drum 361 when the entire hoisting rope 32 is unwound). Therefore, by constantly detecting the total amount of rotation of the winch drum 361 from the rotation amount detection device 630, it is possible to obtain the layer sequence information and the amount of movement of the hoisting rope 32 when the wear occurrence condition is established, and it is also possible to configure the measurement unit 628 without the distance measurement device 629.

[0073] It is also possible to measure the occurrence of wear without using either the distance measuring device 629 or the rotation amount detecting device 630. For example, a sensor that detects whether the hoisting rope 32 is moving on the drum flange 363 side of the winch drum 361 may be provided to detect the first row, etc.

[0074] In the above embodiment, a monitoring device for the winch drum 361 of the hoisting winch 36 is exemplified, but a monitoring device having the same configuration may also be provided for the winch drum of the hoisting winch 42. In addition, in the above embodiment, an example has been shown in which a monitoring device is provided on the winch drum of a crawler crane, but the present invention is not limited to crawler cranes and is applicable to any cranes having a winch drum, including other mobile cranes such as wheel cranes and truck cranes, as well as port cranes, overhead cranes, jib cranes, gantry cranes, unloaders, fixed cranes, etc. Furthermore, the present invention is not limited to cranes equipped with load hooks, but can also be applied to cranes that suspend attachments such as magnets and earth drill buckets.

[0075] In the above embodiment, the notification is issued based on the establishment of the wear occurrence condition. However, for example, the notification may be cancelled by an input from the input unit 621. Furthermore, in the case where the wear occurrence condition is set to be the winding or unwinding of the first layer, the notification process may be cancelled at the time when the state corresponding to the wear occurrence condition is eliminated.

[0076] Also, although it has been mentioned that the wear occurrence condition may be that the total amount of flange adjacent movement exceeds a threshold, in this case, once the threshold is exceeded, it is difficult to escape from the state corresponding to the wear occurrence condition, but in response to this, for example, when the first row winding or unwinding state is escaped, the notification process may be cancelled. In that case, the notification process may be resumed when the first row winding or unwinding state occurs again. In addition, the transmission processing unit 612 accumulates and records the integrated value of the execution time of the above-mentioned alarm as operation information of the crane 1, and can output it to the outside. The execution time of the alarm may be the integration of all the time that meets the wear occurrence condition, or it may be the integration of the time during which the alarm was issued (the time during which the first row is being wound or unwound). [Explanation of symbols]

[0077] 1. Crane 32 Hoisting rope (wire rope) 36 Hoisting winch 37 Descending Rope 42 Hoisting winch 50 Management Server 60 Control device 61 Controller 70 Information terminal 100 Information Management System 361 Winch Drum 362 Winding section 363 Drum flange 611 Monitoring processing unit (monitoring means) 612 Transmission processing unit (monitoring means) 621 Input section 622 Display device (notification means) 628 Measurement unit (monitoring means) 629 Distance Measuring Device 630 Rotational Amount Detection Device G display screen N1 1st Icon N2 2nd Icon W Layer information display area Column a column b

Claims

1. A monitoring device for a winch drum of a crane, comprising: A monitoring means for monitoring whether or not a wear occurrence condition that predicts wear occurring in the winch drum is established; and an alarm means for issuing an alarm based on the establishment of the wear occurrence condition.

2. A monitoring device for a winch drum of a crane, comprising: A monitoring means for monitoring whether a wear occurrence condition is established for the winch drum; a notification means for notifying the wear occurrence condition based on the establishment of the wear occurrence condition, The winch drum has a winding portion around which the wire rope is wound, and drum flanges provided on both ends of the winding portion so as to protrude in the radial direction, The wear occurrence condition is a condition regarding a flange adjacent movement amount, which is a movement amount of the wire rope at a position adjacent to the drum flange. Winch drum monitoring device.

3. Accumulating crane operation information during the period when the wear occurrence condition is met A winch drum monitoring device according to claim 1 or 2.

4. The operation information of the crane is divided into a plurality of categories, and information related to the wear occurrence conditions is accumulated for each category of the operation information.

4. The winch drum monitoring device according to claim 3.

5. A monitoring device for a winch drum of a crane, comprising: A monitoring means for monitoring whether a wear occurrence condition is established for the winch drum; a notification means for notifying the wear occurrence condition based on the establishment of the wear occurrence condition, Accumulating crane operation information during the period in which the wear occurrence condition is met; The operation information of the crane is divided into a plurality of categories, and information related to the wear occurrence conditions is accumulated for each category of the operation information; The winch drum has a winding portion around which the wire rope is wound, and drum flanges provided on both ends of the winding portion so as to protrude in the radial direction, The wear occurrence condition is a condition regarding a flange adjacent movement amount, which is a movement amount of the wire rope at a position adjacent to the drum flange, Load information relating to the load acting on the wire rope is divided into a plurality of categories, and the flange adjacent movement amount is accumulated for each category of the load information. Winch drum monitoring device.

6. The monitoring means monitors the layer arrangement state of the wire rope wound around the winch drum. A winch drum monitoring device according to any one of claims 1 to 5.

7. The wear occurrence condition includes a condition that is satisfied when a first layer of the wire rope wound around the winch drum is being used. A winch drum monitoring device according to any one of claims 1 to 6.

8. The notification means displays a layer sequence indicating which layer and which row the unwound portion of the wire rope wound around the winch drum is in, and also displays a message to that effect when the wear occurrence condition is satisfied, When the unwinding portion of the wire rope changes from the second layer to the first layer, the notification means displays, in addition to the layer sequence display, that the unwinding portion has become the first layer. A winch drum monitoring device according to any one of claims 1 to 7.

9. A crane equipped with a winch drum monitoring device described in any one of claims 1 to 8.

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