JP5832381B2 - Work machine - Google Patents

Description

  The present invention relates to a work machine having a wire rope wound around a plurality of sheaves.

  A work machine such as a crane has a mechanism for raising and lowering an attachment (such as a boom). In this mechanism, a wire rope is hung on a sheave multiple times (hereinafter referred to as a undulating rope), and the undulating operation is performed by feeding or winding the undulating rope with a winch (hereinafter referred to as a undulating winch). Since this hoisting rope holds the attachment, the hoisting rope inspection is an important item for the crane operator.

  A wire rope tester is known as a device for detecting an abnormality in a wire rope. Also, an apparatus as described in Patent Document 1 is known.

JP 2010-247996 A

  However, in the case of a wire rope tester, it is expensive to incorporate into a crane, and to use alone, it is necessary to unwind the undulation rope from the winch, such as disassembling the mechanical attachment, which is very laborious.

  Further, the device described in Patent Document 1 derives information on the maintenance timing of the wire rope based on the sheave diameter and the number of sheaves through which the wire rope fed from the winding winch passes and the rope diameter of the wire rope. To do. In the maintenance period, the entire wire rope is exchanged.

The work machine according to the invention of claim 1 is configured to calculate a degree of fatigue in a plurality of regions of a wire rope hung around a plurality of sheaves as a number of sheave passages for each of the plurality of regions; And a display device that visualizes and displays the degree of fatigue of the wire rope for each of a plurality of regions, and the display screen of the display device displays a sheave graphic that simulates a plurality of sheaves and a plurality of sheaves. The wire rope graphic display imitating the wire rope in the state of being displayed is displayed, and among the plurality of regions, the region having a fatigue level equal to or higher than a predetermined value has a display form different from the other regions and the degree of fatigue in the display mode corresponding to, it is displayed on the wire rope graphical display on it you characterized.
According to a second aspect of the present invention, in the work machine according to the first aspect, the calculation means calculates the distance from the specific position of the wire rope to each position where the plurality of sheaves contact, and calculates the number of times the sheave has passed. It is characterized by that.
According to a third aspect of the present invention, in the work machine according to the second aspect, the work machine includes an attachment attached to a frame of the work machine so as to be able to undulate, and an angle detector for detecting a undulation angle of the attachment, and the wire rope includes the attachment. The hoisting rope for hoisting is characterized in that the calculating means calculates the distance based on the hoisting angle detected by the angle detector.
According to a fourth aspect of the present invention, in the work machine according to any one of the first to third aspects, a tension detector that detects the tension of the wire rope is provided, and the calculation means is detected by the number of sheave passages and the tension detector. The degree of fatigue is calculated for each of a plurality of regions based on the applied tension and / or the sheave residence time in the region.
The invention according to claim 5 is the management server according to any one of claims 1 to 4 , wherein the operation data of the work machine is managed with the calculation result of the fatigue level and the ID data associated with the wire rope. And a communication means for transmitting and receiving data.

  According to the present invention, the degree of fatigue of the rope is estimated and visualized for each area of the rope, so that the operator can easily recognize which area on the wire rope is a part with a high degree of fatigue. Can do.

It is a figure which shows an example of the working machine by this invention. It is a figure which shows the structure of a hoisting rope management system. It is a figure which shows the geometric relationship of the boom 4, the pendant rope 11, the hoisting rope 7a, the bridle 12, and the bale 13. FIG. FIG. 3 is a diagram schematically showing the relationship between sheaves S2, S4 provided on the bridle 12 and the hoisting rope 7a laid around the sheaves S1, S3, S5 provided on the bail 13. It is a figure which shows a mode that sheaves S1-S5 pass on the hoisting rope 7a. It is a flowchart which shows an example of a sheave passage count number calculation. It is a figure which shows the setting state of flag fn (m), fn (m-1), and sheave passage count number Gn when the number of operations m is m = 1, 2, 3, 4. It is the figure which showed the fatigue degree for every conversion method with the bar graph. It is a figure which shows the example of a display of a fatigue degree. It is a figure which shows the mode of the movement of the management area | region R required when the hoisting rope 7a is wound up by the hoisting drum 7. FIG. It is a figure explaining the offset of a rope end point. It is a conceptual diagram of the system which transmits the calculation result of a fatigue degree to another work machine via a management server.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is an external side view of a crane as an example of a working machine according to the present invention when viewed from the right side, and shows a working posture. The crane 1 includes a crawler type traveling body (traveling body) 10, a revolving body 3 that is turnably mounted on the traveling body via a swivel wheel 2, and a frame (a revolving frame) 30 of the revolving body 3. And a boom 4 that is pivotally supported by the hoist. Reference numeral 31 denotes a cab of the crane 1. The revolving frame 30 is provided with a main winding drum 5 around which the main winding rope 5a is wound, an auxiliary winding drum 6 around which the auxiliary winding rope is wound, and a hoisting drum 7 around which the hoisting rope 7a is wound. A counterweight 8 is supported at the rear end of the frame 30. An A frame 20 (also called a gantry) is erected on the rear side of the boom 4. The A frame 20 can be turned backward by expansion and contraction of the undulating cylinder 21.

  The main winding rope 5a is connected to the hook 9 via the boom tip, and the hook 9 moves up and down by driving the main winding drum 5. One end of a pendant rope 11 is connected to the tip of the boom, and the other end of the pendant rope 11 is connected to a bridle 12. A bail 13 is attached to the top of the A frame 20, and the hoisting rope 7 a is connected to a plurality of sheaves (not shown) provided on the bridle 12 via a sheave 22 on the top of the A frame and a plurality of sheaves provided to the bale 13. (Not shown). When the hoisting drum 7 is driven in this state, the distance between the bale 13 and the bridle 12 changes, and the boom 4 rises and lowers via the pendant rope 11.

  FIG. 2 is a diagram showing the configuration of the hoisting rope management system. In the present embodiment, as the arithmetic device 100, an arithmetic device of an overload prevention device provided in the crane 1 is used. The overload prevention device acquires the load suspended by the attachment (boom 4), the boom length setting value (BL) for calculating the working radius, and the boom angle data detected by the boom angle detector 110. Yes.

  Further, the tension data of the hoisting rope 7 a is input from the tension detector 120 to the arithmetic device 100. As the tension detector 120, a load cell provided at a rope end point is used. As will be described later, the calculation device 100 calculates the degree of fatigue of the hoisting rope 7a for each region of the hoisting rope 7a, and displays the degree of fatigue in each region based on the calculation result in the cab 31. 130 is visualized and displayed.

  As described above, when the distance between the bale 13 and the bridle 12 is changed in order to raise and lower the boom 4, a predetermined region of the hoisting rope 7a passes through the sheave provided in the bail 13 and the bridle 12. During this passage, the undulating rope 7a is bent along the sheave surface, so that the degree of fatigue of the rope region having a high sheave passage frequency is increased by repeating this bending. In the present embodiment, the hoisting rope 7a is divided into a plurality of regions and the degree of fatigue is calculated for each of the plurality of regions, thereby enabling finer hoisting rope management.

[Calculation method of number of sheave passages]
FIG. 3 is a diagram illustrating a geometric relationship among the boom 4, the pendant rope 11, the hoisting rope 7 a, the bridle 12, and the bail 13. In FIG. 3, position A (AX, AY) is the attachment position of the pendant rope 11 on the boom 4, position C (CX, CY) is the position of the bridle 12, and position B (BX, BY) is the position of the bail 13. Here, the starting point of the boom 4 is the origin (0, 0).

  BL is the boom length, PL is the pendant length, L is the distance between A and B, X is the distance between the bridle and the bale, and L0 is the distance between the rope end point and the sheave. Further, the angle θ is a boom angle detected by the boom angle detector 110. In the following description, the boom length BL is assumed to be constant.

The position A (AX, AY) can be obtained by calculation if the boom length BL and the boom angle θ are determined. Since the bail position C and the pendant length PL are constant, if the position A is determined, the position B (BX, BY) is also determined. That is, the AB distance L and the bridle-veil distance X are determined, and the bridle-veil distance X is expressed as shown in Equation (1). Here, L is an amount determined from the boom angle θ and the boom length BL as described above, and is expressed as L (θ, BL).
X = L (θ, BL) −PL (1)

   FIG. 4 schematically shows the relationship between the sheaves S2 and S4 provided on the bridle 12 and the hoisting rope 7a hung between the sheaves S1, S3 and S5 provided on the bail 13. is there. Here, in order to simplify the description, the number of sheaves provided in the bridle 12 and the bale 13 is two and three, respectively, but the concept described below also applies when the number of sheaves is larger than these. Can be applied as well. FIG. 4A shows the case where the boom angle is θ1, and FIG. 4B shows the case where the boom angle is θ2 (> θ1).

  When the hoisting rope 7a is fed out of the hoisting drum 7 in order to reduce the boom angle θ, the bridle 12 moves to the left side in the figure, and the bridle-veil distance X increases. Conversely, when the hoisting rope 7a is wound around the hoisting drum 7 in order to increase the boom angle θ, the bridle 12 moves to the right side in the figure and the bridle-bale distance X becomes smaller.

The crosses indicated on the hoisting rope 7a in FIG. 4 (a) are the positions of the sheaves S1 to S5 on the hoisting rope 7a (positions from the end points of the rope). ). SD is the diameter of sheaves S1-S5. For the sake of simplicity, it is assumed that the positions of the sheaves S2 and S4 in FIG. 4 coincide with the position of the bridle 12, and the positions of the sheaves S1, S3 and S5 coincide with the position of the bail 13. Assuming that
S1: L0 (2)
S2: L0 + X + SD · π / 4 (3)
S3: L0 + 2 (X + SD · π / 2) −SD · π / 4 (4)
S4: L0 + 3 (X + SD · π / 2) −SD · π / 4 (5)
S5: L0 + 4 (X + SD · π / 2) −SD · π / 4 (6)

  Since the boom angle in FIG. 4A is θ1, X in the equations (3) to (6) is X = L (θ1, BL) −PL. The bridle-veil distance X2 when the boom angle is changed from θ1 to θ2 (> θ1) is X2 = L (θ2, BL) −PL. Since L (θ1, BL)> L (θ2, BL) with respect to the change in the boom angle θ, X> X2, and the bridle 12 approaches the bail side by Xm as shown in FIG. The sheave position in the case of θ2 is indicated by a black circle. When the hoisting rope 7a is wound around the hoisting drum 7 by a length of 4Xm, the bridle 12 (sheaves S2, S4) moves by Xm to the right in the figure, and the x mark shown in FIG. ). That is, each sheave has moved on the hoisting rope 7a from the x mark to the black circle mark.

  FIG. 5 shows how the sheaves S1 to S5 pass over the hoisting rope 7a. In FIG. 5, the undulation rope 7a is displayed in a straight line, and the sheaves S1 to S5 are arranged on the undulation rope 7a. FIG. 5 shows the sheave position when the boom angles are θ1 and θ2, and the region set in the hoisting rope 7a (hereinafter, the region is referred to as a cell). Below the cell number display, the sheave passage count in the case of θ1 and the sheave passage count in the case of θ2 are shown.

  Cells C <b> 1 to C <b> 15 set in the hoisting rope 7 a represent each region when the fatigue level of the hoisting rope 7 a is managed for each region. The length of the cell may be set to an appropriate length for fatigue management, and may be set to 2SD or SD / 2, for example, based on the sheave diameter SD, twice the twisted length of the rope, 1 / It can be set to 2 times.

  The sheave passage count is an index indicating the degree of fatigue of each cell. As described above, when the hoisting rope 7a passes through the sheave, the rope is bent, and the degree of fatigue of the rope is increased by repeating the bending. Therefore, here, the number of times the sheave stays in each cell is counted, and it is determined that the degree of fatigue increases as the count number (herein referred to as the sheave passage count number) increases.

  FIG. 6 is a flowchart showing an example of calculating the sheave passage count number. A series of arithmetic processing shown in FIG. 6 is performed in the arithmetic device 100 of FIG. When the arithmetic device 100 is powered on, arithmetic processing is executed, and thereafter, the arithmetic processing is repeatedly executed at predetermined time intervals. In step S100, the boom angle θ detected by the boom angle detector 110 is read. In step S102, an AB distance L (θ, BL) is calculated based on the read boom angle θ and boom length BL, and the calculated AB distance L (θ, BL) and the storage unit 100a. Is substituted into the formula (1) to determine the bridle-veil distance X. And the position (distance from a rope end point) of each sheave S1-S5 is calculated using Formula (2)-(6).

  In step S104, it is determined in which cell among the cells C1 to C15 the positions of the sheaves S1 to S5 are included. Based on the determination result, a flag fn (m) indicating whether or not each cell C1 to C15 includes a sheave is set.

  The storage unit 100a is provided with storage areas for flags fn (m), fn (m-1), and sheave passage count number Gn for each of the cells C1 to C15. Here, n indicates a cell number, and m indicates the number of operations since the power is turned on. As described above, the flag fn (m) is a flag setting based on the current calculation result, and the flag fn (m−1) is a flag setting at the previous calculation. The sheave passage count number Gn is set based on the flags fn (m) and fn (m−1). Note that the data of the sheave passage count number Gn and the flags fn (m) and fn (m−1) stored in the storage unit 100a are retained even when the arithmetic device 100 is turned off.

  FIG. 7 shows an example of setting states of the flags fn (m) and fn (m−1) and the sheave passage count number Gn when the number of operations m is m = 1, 2, 3, and 4. In FIG. 7, each setting regarding C1 to C6 among the cells C1 to C15 shown in FIG. 5 is shown. FIG. 7A shows the sheaves included in the cells C1 to C6 with circles, which are shown at start-up, after lapse of Δt, after lapse of 2Δt, and after lapse of 3Δt. Δt is a time interval when the arithmetic processing shown in FIG. 6 is repeatedly executed. FIG. 7B shows the flags fn (m) and fn (m−1) and the sheave passage count number Gn when m = 1, 2, 3, and 4.

  For example, when the boom angle at the time of turning on the power is the angle θ2 in FIG. 5, the cells C2, C3, C4, and C6 contain sheaves. In this case, f2 (m) = f3 (m) = f4 (m) = f6 (m) = 1 is set, and the setting of the flag fn (m) regarding other cells is not changed. Note that the flags fn (m) and fn (m−1) are set to 0 in the initial state at the time of factory shipment. It can also be manually reset to fn (m) = 0 and fn (m−1) = 0. Here, it is assumed that it was in an initial state when the power was turned on. Therefore, when m = 1, f1 (m) = f5 (m) = 0 is set, and f1 (m-1) = f4 (m-1) = f2 (m-1) = f3 (m-1 ) = F5 (m−1) = f6 (m−1) = 0.

  Returning to FIG. 6, in step S106, the sheave passage count number Gn is set. Here, the flag fn (m−1) and the flag fn (m) are compared. When fn (m−1) = 0 and the flag fn (m) = 1, the sheave passage count number Gn is increased by 1. Let That is, if the sieve is not included in the cell at the previous calculation and the sieve is included in the cell at the current calculation, the sieve passage count number Gn is increased by one. In other cases (fn (m−1) = fn (m), fn (m−1)> flag fn (m)), the setting of the sheave passage count number Gn is not changed.

  In the example shown in FIG. 7, since the sheave included in the cell C4 at m = 2 has moved to the cell C5 at m = 3, the flag fn (m) of the cell C5 changes from 0 to 1 at m = 3. And change. As a result, the flag setting of the cell C5 at m = 3 is fn (m−1) = 0 and the flag fn (m) = 1, and the sheave passage count number Gn is changed from 0 to 1. When m = 4, the sheave included in the cell C3 at m = 3 moves to the cell C4, the fn (m) of the cell C4 becomes 1, and the sheave passage count number Gn of the cell C4 becomes 1 to 2. Increased by one.

  Returning to FIG. 6, in step S108, the setting content of the flag fn (m) based on the current calculation result is copied to the storage area of the flag fn (m−1). For example, the setting content of fn (m) at m = 1 is copied to fn (m−1) at m = 2 in FIG.

  The process shown in FIG. 6 is repeated a plurality of times during the transition from the boom angle θ2 of FIG. 5 to the boom angle θ1, and the sheave passage count number Gn of each of the cells C1 to C15 when the boom angle θ1 is reached is shown in FIG. The value is as shown in the column of θ1. The larger the numerical value of Gn, the greater the degree of fatigue. Therefore, it can be seen that the cell C6 has the highest degree of fatigue in the case of the boom angle θ1 in FIG.

  In the example shown in FIG. 7, the number of sheaves included in each cell is one, but a plurality of sheaves may be included depending on the setting of the cell length. Therefore, for example, when two sheaves are included at the same time, fn (m) = 2 is set, and the number of increases relative to fn (m−1) (= fn (m) −fn (m−1)) ) Only to increase the sheave passage count number Gn.

  In the above-described example, the fatigue level of each cell C1 to C15 of the hoisting rope 7a is expressed by the sheave passage count number Gn. You may do it. For example, the influence of the sheave stay time t and the tension T of the hoisting rope 7a is expressed as a weight W (t, T), and the weight W (t, T) obtained during multiple calculations is integrated to indicate the degree of fatigue. To do.

  For example, in the case of using the weight W (t) considering only the sheave stay time t, the case of FIG. The case where the sheave passage count number Gn is used is the same as that shown in FIG. Therefore, the degree of fatigue of each cell C1 to C6 at m = 4 is expressed as (0, 1, 1, 2, 1, 1) using the sheave passage count number Gn.

  On the other hand, when the weight W (t) is used, the size of W (t) varies depending on the length t of the staying time. In this case, the weight W (t) can be determined by counting how many times fn (m) = 1 continues. For example, in the case of the cell C4, when only the sheave passage count number Gn is considered, the fatigue degree is 2, but the weight for each count is W (2Δt) and W (Δt), so the fatigue degree is W (2Δt). + W (Δt). Therefore, the fatigue levels of the cells C1 to C6 at m = 4 are (0, W (4Δt), W (3Δt), W (2Δt) + W (Δt), W (2Δt), W (4Δt)). It is expressed in

  Further, assuming that W (t) is proportional to the length of time, W (2Δt) = 2W (Δt), so the fatigue level of each of the cells C1 to C6 is (0, 4W (Δt)). 3W (Δt), 3W (Δt), 2W (Δt), 4W (Δt)).

  FIG. 8 is a bar graph showing the degree of fatigue obtained by the above-mentioned three methods. When the sheave passage count number Gn is used (FIG. 8B), the cell C4 has the highest degree of fatigue, but it is assumed that W (t) is proportional to the length of time (FIG. 8D). The fatigue level of the cells C2 and C6 is the largest. FIG. 8 (c) shows a case where W (t) is not proportional to the length of time, and is slightly different from the case where it is assumed that W (t) is proportional (FIG. 8 (d)).

  As described above, since the degree of fatigue calculated differs depending on how the weights W (t) and W (t, T) are set, the weights W (t) and W (t , T) can be set. Furthermore, since the hoisting rope 7a and the pendant rope 11 are slightly bent due to their own weight, more accurate sheave position can be obtained by calculating the sheave position in consideration of the bending amount calculated by calculating the bending. It becomes.

  When the work is resumed the next day with the work machine placed on the site, the state of the predetermined boom angle is continued for a long time. In this case, the time when the power source of the arithmetic device 100 is stopped is stored, the stop time is calculated from the comparison of the time when the power source is turned on again, and the degree of fatigue in the standing time is added. Anyway. In addition, instead of the tension applied to the hoisting rope 7a, the suspended tonnage obtained from the moment limiter is read into the arithmetic unit 100, and when the predetermined suspended tonnage is set as a threshold value and the suspended tonnage exceeds the threshold value, In consideration of the weight W (t, T), the fatigue degree may be estimated by the number of sheave passages when the weight is equal to or less than the threshold.

[Display fatigue level]
As described above, in the present embodiment, the degree of fatigue is calculated for each cell set in the hoisting rope 7a. Therefore, it is possible to visualize and display on the display device which region of the hoisting rope 7a is a place with a high degree of fatigue, and the operator can easily know the fatigue state of each region of the hoisting rope 7a. As a result, not only the countermeasure of exchanging the entire undulation rope 7a as in the prior art, but also by shifting the position of the rope end point of the undulation rope 7a, the frequency of sheave passage in the cell region with a high degree of fatigue can be reduced, It is also possible to extend the life of the hoisting rope 7a.

  FIG. 9 shows a display example of the degree of fatigue. The calculated degree of fatigue is visualized as shown in FIG. 9 and displayed on the display screen 130a of the display device 130. On the display screen 130a, a plurality of sheaves provided on the bridle 12, sheaves provided on the bale 13, and a hoisting rope 7a laid around these sheaves are displayed. It is displayed in a manner similar to the arrangement of the actual sheave and the hoisting rope 7a so that the operator can easily compare the portion of the hoisting rope 7a in the actual crane 1 with each cell. Then, for example, the management area R having a high degree of fatigue such as the cell C6 and the cells C3 to C5 and C7 to C9 in the case of the boom angle θ1 in FIG. 5, the correspondence of the hoisting rope 7a displayed on the display screen 130a. The area to be displayed is displayed visually and clearly.

  In the example shown in FIG. 9, the areas corresponding to the cells with fatigue degrees 2 and 3 are displayed thick and numerical values are also displayed. There are various display forms of the management required area R in addition to the method shown in FIG. 9. For example, colors may be classified so as to be easily understood at a glance. For example, the area of fatigue level 3 in FIG. 9 is displayed in red, and the area of fatigue level 2 is displayed in yellow, so that the operator can easily recognize which part of the hoisting rope 7a the management required area R is. Can do. Appropriate measures can be taken without incurring rope cutting or the like. The required management area R in FIG. 9 moves on the hoisting rope 7a in the same manner as the corresponding cell of the actual hoisting rope 7a when the boom 4 is raised and lowered. FIG. 10 shows the movement of the required management area R when the hoisting rope 7a is wound around the hoisting drum 7, and it moves in the direction of the arrow as compared with the case of FIG.

  In addition, as shown in FIG. 11, the rope end point may be shifted (offset) so that the management area R is not covered with the sheave. As shown in FIGS. 9 and 11, the position of each sheave on the hoisting rope 7a is changed by shifting the rope end point. Thereby, the number of sheave passages in the management area R after the offset can be reduced or zero, and the replacement time of the hoisting rope 7a can be extended.

  Further, when the hoisting rope 7a is used for another work machine, the data of the sheave passage count number Gn and the flags fn (m) and fn (m-1) held in the storage unit 100a are used as the hoisting rope 7a. The history data may be transferred to other work machines together with the ID data of the hoisting rope 7a (stored in the storage unit 100a). By doing so, the safety management of the hoisting rope 7a can be performed in more detail.

  As a data transfer method, data may be transferred to a processing device of another work machine via a magnetic recording medium, or transferred to another work machine via a management server that manages work information of the work machine. Anyway. FIG. 12 is a conceptual diagram of a system that transmits a calculation result of the degree of fatigue to another work machine via the management server.

  Here, the case where the hoisting rope 7a used in the work machine 202 is used in another work machine 203 will be described. A portable terminal device 202a provided for the work machine 202 can exchange data with the work machine 202 and with the radio base station 200 by wireless communication. A mobile terminal device 203 a provided for the work machine 203 can exchange data with the work machine 202 and with the radio base station 200 by wireless communication. The work machines 202 and 203 are provided with a communication device capable of short-range communication with the portable terminal devices 202a and 203a. The mobile terminal devices 202a and 203a incorporate a GPS device, and the GPS device receives a signal from a GPS satellite 204 existing in the sky by a GPS antenna and performs positioning.

  Data in the portable terminal devices 202a and 203a is transmitted to the radio base station 200 by radio communication, and is transmitted to the management server 201 via the radio base station 200. The operator of the work machine 202 operates the portable terminal device 202a, and causes the fatigue degree data calculated by the calculation device 100 to be taken into the portable terminal device 202a from the work machine 202 together with the ID data of the hoisting rope 7a. Further, these data are transmitted from the mobile terminal device 202 a to the radio base station 200 and further stored in the management server 201.

  The operator of the work machine 203 wearing the hoisting rope 7a used in the work machine 202 operates the portable terminal device 203a to store the hoisting rope 7a data (fatigue degree data and ID data) stored in the management server 201. ) In the portable terminal device 203a via the radio base station 200. Further, the data in the portable terminal device 203 a is stored in the storage unit in the arithmetic device of the work machine 203. The calculation device of the work machine 203 calculates the fatigue level of the hoisting rope 7a attached to the work machine 203 based on the fatigue level data and ID data stored in the storage unit.

  In the example illustrated in FIG. 12, data is transmitted to and received from the radio base station 200 via the mobile terminal devices 202 a and 203 a provided in the work machines 202 and 203. The station 200 may be configured to directly transmit and receive.

  In this way, the work machine 202 communicates with the management server 201 that manages work information of the work machine, communication means (portable terminal) for transmitting and receiving the calculation result of the fatigue level and the ID data associated with the hoisting rope 7a. Device 202a and communication device provided in work machine 202). Therefore, even when the hoisting rope 7a is used in common between different work machines, the degree of fatigue of the hoisting rope 7a can be managed in more detail.

  As described above, in the present embodiment, arithmetic device 100 determines the degree of fatigue in the plurality of regions (cells C1 to C15) of the wire rope (undulation rope 7a) hung around the plurality of sheaves for each of the plurality of regions. Is calculated as the number of sheave passages Gn. And the display apparatus 130 visualized and displayed the fatigue degree of the hoisting rope 7a for every some area | region (cell C1-C15) based on the calculation result of the calculating apparatus 100. FIG.

  Therefore, the operator can easily recognize which region on the wire rope is a portion having a high degree of fatigue, and can perform more appropriate wire rope management according to the degree of fatigue. For example, when a management area where the degree of fatigue is concentrated as shown in FIG. 9 occurs, the rope end point is offset to prevent the sheave from entering the management area, so that the undulating rope can be used as in the prior art. There is no need to replace the entire 7a.

  The computing device 100 calculates the distance from the specific position of the hoisting rope 7a (for example, the rope end point described above) to each position where the plurality of sheaves S1 to S5 touch each other, and based on the calculated value, calculates the number of sheave passages. Calculate. In the above-described example, the distance is calculated based on the boom angle as shown in the equations (2) to (6). However, the distance from the rope end point to the sheave position is calculated based on the rotation amount of the hoisting drum 7. It may be calculated.

  In addition, a configuration that detects the undulation angle of an attachment such as a boom by the angle detector 110 and calculates the number of sheave passages based on the detected undulation angle is added to the existing work machine. Without doing so, the degree of fatigue after each region can be determined.

  Further, the display device 130 displays the cells C1 to C15 in a display form corresponding to the degree of fatigue on the hoisting rope 7a that is hung around a plurality of sheaves. In the example shown in FIG. 9, a plurality of sheaves included in the bridle 12, a plurality of sheaves included in the bale, and a hoisting rope 7a in a state of being hung around the plurality of sheaves are displayed on the display screen 130a. A plurality of cells (required management area R) are displayed in a color indicating the degree of fatigue on the hoisting rope 7a. Of course, all the cells may be displayed in color. However, since the number of displays is large and it is difficult to see, it is preferable to display the management area R requiring attention as shown in FIG. Moreover, you may make it display the number which shows a fatigue degree instead of color-coding. By adopting such a configuration, the operator can easily recognize which part of the hoisting rope 7a is the management area R, and can reduce the labor of inspection work.

  The above description is merely an example, and when interpreting the invention, there is no limitation or restriction on the correspondence between the items described in the above embodiment and the items described in the claims. For example, in the above-described embodiment, the hoisting rope 7a for hoisting the attachment (boom 4) has been described as an example, but the present invention can also be applied to the main winding rope 5a that hangs the hook 9 shown in FIG.

  1: crane, 4: boom, 7a: hoisting rope, 11: pendant rope, 12: bridle, 13: bale, 22, S1 to S5: sheave, 100: arithmetic unit, 100a: storage unit, 110: boom angle detector , 120: tension detector, 130: display device, 130a: display screen, C1 to C15: cells

Claims (5)

Calculation means for calculating the degree of fatigue in a plurality of regions of the wire rope hung around a plurality of sheaves as the number of sheave passages for each of the plurality of regions;
A display device for visualizing and displaying the degree of fatigue of the wire rope for each of the plurality of regions based on the calculation result of the calculation means ;
On the display screen of the display device, a sheave graphic display imitating the plurality of sheaves and a wire rope graphic display imitating a wire rope hung around the plurality of sheaves are displayed.
Of the plurality of regions, a region having a fatigue level equal to or greater than a predetermined value is displayed on the wire rope graphic display in a display form different from the other regions and in a display form according to the degree of fatigue. that, working machine, characterized in that. The work machine according to claim 1,
The work machine calculates the number of sheave passages by calculating the distance from each specific position of the wire rope to each position where the plurality of sheaves contact each other. The work machine according to claim 2,
An attachment attached to the frame of the work machine in a undulating manner;
An angle detector for detecting the undulation angle of the attachment;
The wire rope is a hoisting rope for hoisting the attachment,
The work machine is characterized in that the distance is calculated based on the undulation angle detected by the angle detector. The work machine according to any one of claims 1 to 3,
A tension detector for detecting the tension of the wire rope;
The calculation means calculates the degree of fatigue for each of the plurality of regions based on the number of times of passing through the sheave and the tension detected by the tension detector and / or the sheave stay time in the region. Work machine. The work machine according to any one of claims 1 to 4 ,
A working machine comprising a communication unit for transmitting and receiving the calculation result of the fatigue degree and the ID data associated with the wire rope to a management server that manages work information of the work machine.

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