JP6520562B2 - Weight floating amount adjusting device for mobile crane and weight floating amount adjusting method - Google Patents

Description

  The present invention relates to a weight floating amount adjusting device and a weight floating amount adjusting method of a mobile crane provided with a separable weight disposed behind an upper revolving superstructure.

  Conventionally, as a large crane, a so-called counterbalance type crane as described in, for example, Patent Document 1 is known. The crane of this type is comprised of an upper slewing body pivotally mounted on a lower traveling body, a boom whose proximal end is supported to be movable up and down at the front of the upper slewing body, and hanging from the tip of the boom And a mast having a proximal end supported by the upper swing body at a position rearward of the proximal end of the boom and being telescopically supported by the upper swing body and a tip connected to the distal end of the boom via a boom guy line and a boom relief rope. And a separable weight suspended from the mast and disposed behind the upper swing body, and the separable weight is configured to be lifted from the ground by a predetermined dimension when the load is lifted by the suspender. ing.

JP, 2008-287112, A

  By the way, as the separation type weight, there is a pallet weight with a weight mounted on the pallet, or a counter weight carriage having wheels, etc., when the load is lifted by a lifting tool, the separation type weight itself is only a predetermined size from the ground It is necessary for the separate type weight to be in an appropriate state so that it does not disturb the floating of the upper swing body.

  However, mobile cranes, especially large mobile cranes, are disassembled, transported, and assembled at the site where they work, so it is important to know that the separated weights are in an appropriate state after assembly. Can not. It is the fact that the operator adjusts the floating amount while actually carrying out the lifting work of the load, and it is difficult to adjust at the site where the condition is different each time.

  The present invention has been made in view of such a point, and the problem is that by setting the amount of rotation of the mast hoist winch properly at the end of assembly at the work site, the separation-type weight can be An object of the present invention is to provide a weight floating amount adjusting device and a weight floating amount adjusting method of a mobile crane capable of easily realizing a state of rising by a predetermined dimension from the ground.

  In order to solve the above-mentioned problems, the present invention is, as a mobile crane, an upper revolving unit pivotally mounted on a lower traveling unit, and a proximal end supported on the front of the upper revolving unit so as to be able to move up and down. Boom, a hanger suspended from the tip of the boom, and a proximal end supported by the upper swing body at a position rearward of the proximal end of the boom so as to be capable of being undulated by the upper swing body and a tip being a boom guy line and a boom undulation rope A mast connected to the tip of the boom via the mast, a mast hoisting winch for raising and lowering the mast, and a separated weight suspended from the mast and disposed behind the upper swing body, the hanger It is assumed that the separate type weight is configured to be lifted from the ground when the load is lifted. Then, as a weight floating amount adjusting device of a mobile crane, a detecting unit for detecting a rotating amount of the mast raising and lowering winch, and a rotation amount of the mast raising and lowering winch in a state where the separation type weight is lifted in advance by a predetermined dimension from the ground A storage unit to store as a quantity, a calculation unit that calculates a difference between a rotation amount detected by the detection unit when the mobile crane is assembled at a work site, and the reference rotation amount, and the calculation unit And a notification unit for rotating the mast hoisting winch with respect to the operator by the amount of the difference and urging the operator to set the reference rotation amount.

  In this configuration, when the mobile crane is assembled at a work site, the difference between the amount of rotation of the mast hoist winch detected by the detection unit and the reference amount of rotation stored in the storage unit is calculated by the calculation unit. The notification unit prompts the operator to rotate the mast hoisting winch and set the reference rotation amount. When the operator rotates the mast hoisting winch based on the prompt of this notification unit and sets the amount of rotation to the reference amount of rotation, the amount of rotation of the mast hoisting winch should be properly set when assembly at the work site is finished. Can. Thereafter, when the load is lifted by the hanger, it is possible to easily realize the state in which the separated weight is lifted from the ground by a predetermined dimension.

  Here, the separation-type weight and the rear portion of the upper swing body may be connected by a connection beam so that their lengths can be changed. In this case, the reference amount of rotation of the mast hoisting winch in a state where the separated weight is lifted from the ground by a predetermined dimension is different for each length of the connecting beam.

  Corresponding to this, it further comprises a measurement unit that measures the length of the connection beam, and the reference rotation amount is set for each length of the connection beam and stored in the storage unit, the calculation Preferably, the unit is provided to calculate the difference between the reference rotation amount corresponding to the length of the connection beam measured by the measurement unit and the rotation amount detected by the detection unit. In this case, the length of the connection beam is measured by the measurement unit in response to the reference rotation amount of the mast relief winch being different for each length of the connection beam, and the length of the connection beam measured by this measurement unit The difference between the reference rotation amount corresponding to the rotation amount of the mast hoisting winch detected by the detection unit is calculated by the calculation unit, and the mast hoisting winch is rotated for the operator by the difference and set as the reference rotation amount. Is prompted by the notification unit. As a result, it is possible to easily realize a state in which the separation-type weight is lifted from the ground by a predetermined dimension corresponding to the length of the connection beam.

  Here, as an example of the separation-type weight, it is a counterweight cart having wheels.

  The weight floating amount adjustment method of the present invention, like the weight floating amount adjustment device of the present invention, includes an upper swing body rotatably mounted on a lower traveling body, and a base end of the upper swing body having an undulated base end. A boom supported on the upper end of the boom rotatably supported on the upper swing body at a position rearward of the proximal end of the boom and a boom supported by the boom guy line It comprises a mast connected to the tip of the boom via a boom undulation rope, a mast undulation winch for undulating the mast, and a separable weight suspended from the mast and disposed behind the upper swing body. The mobile crane is configured such that the separation-type weight is lifted from the ground when the load is lifted by the lifting device. In addition, the mobile crane stores, as a reference rotation amount, a rotation amount of the mast elevation winch in a state in which the separated weight is lifted by a predetermined dimension from the ground, and a detection unit that detects the rotation amount of the mast elevation winch. And a storage unit. Then, when the mobile crane is assembled at a work site, the rotation amount detected by the detection unit is set as the reference rotation amount.

  With this configuration, the amount of rotation of the mast hoist winch can be appropriately set when assembly at the work site is finished. Thereafter, when the load is lifted by the hanger, it is possible to easily realize the state in which the separated weight is lifted from the ground by a predetermined dimension.

  According to the weight floating amount adjusting device and the weight floating amount adjusting method of the mobile crane in the present invention, the amount of rotation of the mast hoist winch can be appropriately set when the assembly at the work site is finished, and the lifting of the load At times, it is possible to easily realize that the separation-type weight is lifted from the ground by a predetermined size.

FIG. 1 is a side view showing an entire configuration of a crawler crane according to an embodiment of the present invention. FIG. 2 is a block diagram of a weight floating amount adjusting device provided on the crawler crane. FIG. 3 is a view corresponding to FIG. 1 showing one process for explaining the assembly procedure at the work site. FIG. 4 is a view corresponding to FIG. 1 showing the process shown in FIG. 3 to the next process. FIG. 5 is a view corresponding to FIG. 1 showing the process shown in FIG. 4 to the next process. 6 is a view corresponding to FIG. 1 showing a state in which the load is lifted from the step shown in FIG.

  Hereinafter, an embodiment which is a mode for carrying out the present invention will be described based on the drawings.

  FIG. 1 shows the entire configuration of a crawler crane 1 as a mobile crane according to an embodiment of the present invention. The crawler crane 1 includes a crane body 10, a counterweight carriage 40 as a separate weight disposed behind the crane body 10, and a telescopic beam 50 as a connecting beam for connecting these.

  The crane main body 10 includes a lower traveling body 12 traveling by the crawler 11, an upper revolving body 14 rotatably mounted via the revolving device 13 on the lower traveling body 12, and a front portion of the upper revolving body 14 The cab 15 provided, the boom 16 supported at the front of the upper swing body 14 and at the side end of the cab 15 so as to be able to move up and down (that is, pivotable about a horizontal axis), and the base end of the boom 16 A mast 17 is supported at its proximal end on the upper swing body 14 so as to be able to move up and down at a position rearward of the boom foot, and a gantry 18 and a counterweight 19 provided at the rear of the upper swing body 14.

  A hanger 22 is suspended from a tip end of the boom 16 via a hoisting rope 21. One end of the hoisting rope 21 is wound around a winding winch 23 provided on the upper slewing body 14 through the rear side of the boom 16. Then, by hoisting or unwinding the hoisting rope 21 with the wind-up winch 23, the lifting gear 22 is rolled up or down.

  One end of a boom guy line 24 is connected to the tip of the boom 16, and a spreader 25 is provided at the other end of the boom guy line 24. A boom undulation rope 27 is wound around the spreader 25 and a spreader 26 provided at the tip of the mast 17. One end of the boom undulation rope 27 passes from the spreader 26 to the rear side of the mast 17 to provide a mast It is taken up by a boom hoisting winch 28 provided at the base end of 17. Therefore, the tip of the boom 16 and the tip of the mast 17 are connected via the boom guy line 24 and the boom undulation rope 27, and the boom undulation rope 27 is wound or unwound by the boom undulation winch 28. 16 is designed to move up and down.

  One end of a mast guy line 31 is connected to the tip end of the mast 17, and a spreader 32 is provided at the other end of the mast guy line 31. A mast relief rope 34 is wound between the spreader 32 and a spreader 33 provided at the top of the gantry 18, and one end of the mast relief rope 34 is provided with a mast relief provided at the base end of the gantry 18. It is wound around a winch 35. The mast 17 is configured to be raised and lowered by winding or unrolling the mast relief rope 34 with the mast relief winch 35.

  The counterweight carriage 40 is a separate type weight suspended from the tip of the mast 17 via the hanger line 36 and disposed behind the upper revolving structure 14 and has a plurality of wheels (only one wheel is shown in the figure). It has 41. The wheels 41 are rotationally driven by a hydraulic drive motor (not shown), and are provided so as to be pivotable about a vertical axis. However, at the time of normal work, as shown in FIG. 6, when the load W is lifted by the lifting device 22 of the crane main body 10, the counterweight carriage 40 lifts up from the ground by a predetermined size S, and in this condition It is performing a turning operation and so on.

  As shown in FIG. 6, the telescopic beam 50 is telescopic in length by arranging two tubular members 51 and 52 in a nested manner. One end (front end) of the inner cylindrical member 51 is coupled to the rear end of the upper swing body 14 of the crane main body 10 by a coupling pin or the like, and one end (rear end) of the outer cylindrical member 52 is , And fixed in a state in which the counterweight carriage 40 is penetrated. The other end side (rear end side) of the inner cylindrical member 51 is inserted into the inside from the other end (front end) of the outer cylindrical member 52, and the inner cylindrical member with respect to the outer cylindrical member 52 The length of the telescopic beam 50 is determined in inverse proportion to the insertion length 51.

  The length of the telescopic beam 50 is changed by relative movement of the crane main body 10 and the counterweight carriage 40 in the front-rear direction, or by expansion and contraction of a hydraulic cylinder disposed inside the telescopic beam 50. It has become. Further, although not shown, the length of the telescopic beam 50 is changed into a plurality of stages (for example, four stages) by a positioning device having positioning pins. 1 and 3 show the telescopic beam 50 having the minimum length, and FIGS. 4 to 6 show the telescopic beam 50 having the maximum length.

  The crawler crane 1 further includes a weight floating amount adjusting device 60 as shown in FIG. 2 so that the floating amount of the counterweight carriage 40 can be adjusted when the load W is lifted. The weight floating amount adjustment device 60 receives signals from the detection unit 61 that detects the rotation amount of the mast hoist winch 35, the measurement unit 62 that measures the length of the telescopic beam 50, and the detection unit 61 and the measurement unit 62. Controller 63 and a display unit 64 as a notification unit.

  The detection unit 61 includes an encoder or the like attached to the rotation shaft of the mast hoist winch 35 or the like. The amount of rotation of the mast hoisting winch 35 is the same as the amount of winding of the mast hoisting rope 34 by the mast hoisting winch 35.

  The measuring unit 62 measures the length of the telescopic beam 50 from the telescopic operation of the hydraulic cylinder when the length of the telescopic beam 50 is changed by the hydraulic cylinder, or changes the length of the telescopic beam 50 into a plurality of stages The length of the telescopic beam 50 is to be measured from the operating position of.

  The controller 63 and the display unit 64 are both arranged in the cab 15. The controller 63 is a storage unit 65 composed of a DRAM or the like for storing the rotation amount of the mast hoisting winch 35 in a state where the counterweight carriage 40 is lifted from the ground in advance as a reference rotation amount, and the crawler crane 1 is assembled at a work site A calculation unit 66 including a comparator or the like that calculates the difference between the rotation amount detected by the detection unit 61 and the reference rotation amount stored in the storage unit 65 is provided. Here, since the amount of rotation of the mast hoisting winch 35 in a state where the counterweight carriage 40 is lifted from the ground differs depending on the length of the telescopic beam 50, the reference rotational amount is set for each length of the telescopic beam 50 , And stored in the storage unit 65. Further, the calculation unit 66 is provided to calculate the difference between the reference rotation amount corresponding to the length of the telescopic beam 50 measured by the measurement unit 62 and the rotation amount detected by the detection unit 61.

  The display unit 64 includes a liquid crystal display device or the like. Further, under the control of the controller 63, the display unit 64 rotates the mast raising and lowering winch 35 with respect to the operator by the difference calculated by the calculation unit 66, and the reference rotation amount corresponding to the length of the telescopic beam 50 is obtained. Display a message prompting you to set it. The display unit 64 may not only be newly provided, but may also be used as the display unit of the existing moment limiter device.

  Next, an assembly procedure when assembling the crawler crane 1 at a work site using the weight floating amount adjustment device 60 will be described using FIGS. 3 to 6 in addition to FIGS. 1 and 2.

  Now, as shown in FIG. 1, the crane maker has manufactured the crawler crane 1 and is in a state where the inspection of the product has been completed. At the time of this product inspection, when the load W is lifted by the hanger 22, the rotation amount of the mast hoisting winch 35 in a state where the counterweight carriage 40 lifts up from the ground by a predetermined dimension S is detected by the detection unit 61, and the storage unit 65 performs the reference rotation amount. Is stored as At that time, the amount of rotation of the mast hoisting winch 35 in the state where the counterweight carriage 40 is lifted from the ground by a predetermined dimension S differs according to the length of the telescopic beam 50, so the reference rotational amount is the length of the telescopic beam 50 every And stored in the storage unit 65.

  When the crawler crane 1 is disassembled and transported and assembled at the work site, the assembling procedure, particularly the procedure related to the operation of the mast hoisting winch 35 is performed through the steps shown in FIGS.

  That is, FIG. 3 shows the process of generally completing the assembly of the crawler crane 1 and lifting the lower end of the hanger line 36 to connect it to the link on the counterweight carriage 40 side. At that time, the mast hoisting rope 34 is taken up by the mast hoisting winch 35, and the mast 17 is turned backward.

  Subsequently, as shown in FIG. 4, the telescopic beam 50 is changed to a desired length. FIG. 4 shows a state in which the length of the telescopic beam 50 is changed long from the state shown in FIG. At that time, the mast hoisting rope 34 is taken up by the mast hoisting winch 35, and the mast 17 is turned backward. When the length of the telescopic beam 50 is changed to a short length, the mast hoisting rope 34 is fed out by the mast hoisting winch 35 to raise the mast 17 forward.

  Next, the mast hoisting winch 35 is rotated in accordance with the instruction content displayed on the display unit 64 of the weight floating amount adjustment device 60, and the rotation amount is set to the reference rotation amount corresponding to the length of the telescopic beam 50. At that time, when the mast hoisting rope 34 is not loosened, as shown in FIG. 5, the mast hoisting winch 35 will rotate in the extension direction, and the mast hoisting rope 34 is set to the reference rotation amount in a loosened state. Ru.

  Thereafter, the hoisting rope 21 is once drawn out by the winding winch 23 to lower the hanger 22 close to the ground, and the load W is suspended by the hanger 22 in this state. Subsequently, as shown in FIG. 6, the load W is lifted by winding the hoisting rope 21 with the winding winch 23. At that time, the mast 17 is raised forward by the amount of loosening of the mast relief rope 34 in the previous step, and the counterweight truck 40 is lifted from the ground by a predetermined size S.

  As described above, the weight lift amount adjusting device 60 detects the amount of rotation of the mast raising and lowering winch 35, and the mast lifting relief in a state where the separation-type weight (counterweight carriage) 40 lifts in advance from the ground by a predetermined dimension S. A storage unit 65 that stores the amount of rotation of the winch 35 as a reference amount of rotation, a calculation unit 66, and a display unit 64 are provided. Then, when the crawler crane 1 is assembled at the work site, the difference between the amount of rotation of the mast hoist winch 35 detected by the detection unit 61 and the reference amount of rotation stored in the storage unit 65 is calculated by the calculation unit 66 The display unit 64 prompts the operator to rotate the mast hoist winch 35 by the difference and set the reference rotation amount. When the operator rotates the mast hoist winch 35 based on the prompt of the display 64 and sets the rotation amount to the reference rotation amount, the rotation amount of the mast hoist winch 35 is properly adjusted when assembly at the work site is completed. It can be set. After that, when the load W is lifted by the lifting device 22, it is possible to easily realize a state in which the separation-type weight 40 is lifted from the ground by a predetermined size S.

  In the case of the present embodiment, in particular, the separation-type weight 40 is a counterweight carriage, and the length of the counterweight carriage 40 and the rear portion of the upper revolving structure 14 of the crane body 10 can be changed (in detail, expandable) It is connected by a telescopic beam 50 as a connecting beam. In this case, the reference amount of rotation of the mast hoist winch 35 in the state where the counterweight carriage 40 is lifted from the ground by the predetermined dimension S differs for each length of the telescopic beam 50.

  Corresponding to this, the weight floating amount adjusting device 60 of the present embodiment further includes a measuring unit 62 that measures the length of the telescopic beam 50, and the reference rotation amount is set for each length of the telescopic beam 50. And stored in the storage unit 65. The calculation unit 66 is also provided to calculate the difference between the reference rotation amount corresponding to the length of the telescopic beam 50 measured by the measurement unit 62 and the rotation amount detected by the detection unit 61. For this reason, the calculating unit 66 calculates the difference between the reference rotation amount corresponding to the length of the telescopic beam 50 and the rotation amount of the mast raising and lowering winch 35 detected by the detecting unit 61, and the display unit 64 Only the operator is required to rotate the mast hoist winch 35 to set the reference rotation amount. As a result, in accordance with the length of the telescopic beam 50, it is possible to easily realize the state in which the counterweight carriage 40 is lifted from the ground by the predetermined dimension S.

  The present invention is not limited to the above embodiment, and includes various other embodiments. For example, in the embodiment described above, the display unit 64 of the weight floating amount adjustment device 60 rotates the mast hoist winch 35 with respect to the operator by the difference calculated by the calculation unit 66 to promote setting to the reference rotation amount. Configured. However, according to the present invention, the display unit 64 displays a switch for setting the reference rotation amount together with this display, and when the operator presses this switch, the mast hoisting winch 35 is automatically rotated and the reference rotation amount It may be configured to be set to In addition, instead of the display unit 64 or in combination with the display unit 64, the sound calculated by the calculation unit 66 may be used for the operator for raising and lowering the mast 35 by using the other notification unit, specifically the sound from the speaker. Of course, it may be configured to urge to set the reference rotation amount by rotating the.

  Moreover, although the said embodiment described the case where the counterweight trolley | bogie 40 which has the wheel 41 was used as the isolation | separation type weight 40 which is lifted from the mast 17 and arrange | positioned behind the upper revolving superstructure 14 this invention The same applies to the case of using a pallet weight in which a weight is mounted on a pallet, or another separation type weight instead of the counter weight carriage 40.

  Furthermore, in the above embodiment, the gantry 18 is provided at the rear of the upper revolving superstructure 14, and the top of the gantry 18 and the tip of the mast 17 are connected via the mast guy line 31 and the mast relief rope 34. An arrangement has been described in which one end is wound on a mast hoisting winch 35 provided at the proximal end of the gantry 18. However, the present invention is not limited to this, and as in Patent Document 1, the proximal end of a pillar-shaped mast other than the lattice-type mast can be undulatingly connected to the upper slewing body, the tip of the pillar-shaped mast and the lattice-shaped mast And one end of a mast hoisting rope wrapped between the spreader on the tip side of the pillared mast and the spreader on the rear side of the upper swing body at the rear of the upper swing body. The same can be applied to a configuration for winding on a mast hoist winch.

  In addition, in the embodiment, although the separation-type weight 40 and the rear part of the upper swing body 14 are connected by using the telescopic beam 50 whose length can be expanded and contracted, according to the present invention, instead of the telescopic beam 50, There is no expansion and contraction function by itself, and it may be configured to connect using a connecting beam whose length can be changed by adding and removing members.

  Further, the present invention is of course applicable not only to the crawler crane 1 as in the above embodiment but also to all terrain cranes or other mobile cranes.

1 Crawler crane (mobile crane)
DESCRIPTION OF SYMBOLS 10 crane main body 12 lower traveling body 14 upper revolving body 16 boom 17 mast 22 lifting gear 24 boom guy line 27 boom undulating rope 35 mast undulating winch 40 counter weight cart (separate type weight)
41 wheel 50 telescopic beam (connected beam)
60 weight floating amount adjustment device 61 detection unit 62 measurement unit 63 controller 64 display unit (notification unit)
65 storage unit 66 calculation unit W package

Claims (5)

An upper slewing body pivotally mounted on a lower traveling body, a boom whose proximal end is supported to be able to be raised and lowered at the front of the upper slewing body, and a hanger suspended from the tip of the boom; A mast supported at its proximal end on the upper slewing body at a position rearward of the proximal end of the boom, and having its tip connected to the distal end of the boom via a boom guy line and a boom undulating rope; And a separate type weight suspended from the mast and disposed behind the upper swing body, and configured such that the separate type weight lifts up from the ground when the load is lifted by the lifting device. A floating weight adjustment device for a mobile crane,
A detection unit that detects the amount of rotation of the mast hoist winch;
A storage unit for storing, as a reference amount of rotation, the amount of rotation of the mast hoist winch in a state in which the separation-type weight is lifted from the ground by a predetermined dimension;
A calculation unit that calculates a difference between the rotation amount detected by the detection unit and the reference rotation amount when the mobile crane is assembled at a work site;
And a notification unit for causing the operator to rotate the mast raising and lowering winch and setting the reference rotation amount by the amount of the difference calculated by the calculation unit. Adjustment device.   The apparatus according to claim 1, wherein the separation-type weight and the rear portion of the upper revolving superstructure are connected by a connecting beam whose length can be changed. The measurement apparatus may further include a measurement unit that measures the length of the connection beam.
The reference rotation amount is set for each length of the connection beam and stored in the storage unit.
The movement according to claim 2, wherein the calculation unit is provided to calculate a difference between a reference rotation amount corresponding to the length of the connection beam measured by the measurement unit and a rotation amount detected by the detection unit. Lifting amount adjustment device for cranes.   The said floating weight is a counterweight trolley | bogie which has a wheel, The weight floating amount adjustment apparatus of the mobile crane as described in any one of Claim 1 thru | or 3. An upper slewing body pivotally mounted on a lower traveling body, a boom whose proximal end is supported to be able to be raised and lowered at the front of the upper slewing body, and a hanger suspended from the tip of the boom; A mast supported at its proximal end on the upper slewing body at a position rearward of the proximal end of the boom, and having its tip connected to the distal end of the boom via a boom guy line and a boom undulating rope; And a separate type weight suspended from the mast and disposed behind the upper swing body, and configured such that the separate type weight lifts up from the ground when the load is lifted by the lifting device. Method of adjusting the weight floating amount of a mobile crane,
The mobile crane stores, as a reference rotation amount, a detection unit that detects the rotation amount of the mast raising and lowering winch and a rotation amount of the mast raising and lowering winch in a state in which the separated weight is lifted from the ground by a predetermined dimension. Equipped with
A method for adjusting a weight floating amount of a mobile crane, comprising setting the rotation amount detected by the detection unit to the reference rotation amount when the mobile crane is assembled at a work site.

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