JP2005075607A - Device for preventing interference between telescopic boom and sling or lifted load - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interference prevention device capable of setting the maximum derricking angle θmax of the telescopic boom 1 larger than before so that a lifted load 20 near a crane vehicle A can be lifted without retracting the telescopic boom 1 and automatically restricting the hoisting operation of a sling 5 by the derricking operation of a telescopic boom 1 or a winch so that the telescopic boom 1 does not interfere with the sling 5. <P>SOLUTION: This device for preventing an interference between the telescopic boom 1 and the sling 5 comprises a derricking angle detection means 30 detecting the derricking angle of the telescopic boom 1, a sheave-to-sling distance detection means 31 detecting a distance between a sheave 15 disposed at the tip lower part 1a of the telescopic boom and the sling 5, and a calculation means 33 outputting drive restriction signals to a derricking drive means 46 or a winch drive means 45 so that the telescopic boom 1 does not interfere with the sling 5 based on signals from the derricking angle detection means 30 and the sheave-to-sling distance detection means 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for preventing interference between a telescopic boom pivotably supported in an up and down manner and a hanging tool or a suspended load suspended from the tip of the telescopic boom.

  As shown in FIG. 4, when the hoisting tool 5 suspended from the tip of the telescopic boom 1 is wound up with the undulation angle of the telescopic boom 1 of the crane vehicle being large, interference between the telescopic boom 1 and the hoisting tool 5 occurs. It becomes a problem. As a countermeasure, the cushioning material 11 is attached to the hanging tool (main winding hook 5) shown in FIG. 4 so that the telescopic boom 1 or the main winding hook 5 is not damaged even if the main winding hook 5 collides with the lower surface of the telescopic boom. A technique has been proposed (see, for example, Patent Document 1).

  FIG. 5 shows a state where the hoist (main winding hook 5) is brought close to the sheave 15 arranged at the lower end 1a of the telescopic boom with the telescopic boom 1 of the crane vehicle raised up to the maximum hoisting angle Θmax. The relationship between the winding hook 5 and the telescopic boom 1 is shown. That is, the maximum elevation angle Θmax of the telescopic boom 1 is set to the maximum angle at which the main hook 5 does not interfere with the lower surface 1b of the telescopic boom in the state shown in FIG. Incidentally, in the crane truck manufactured by the applicant, the maximum elevation angle Θmax is set to about 83 degrees.

  Note that by increasing the Lc dimension, which is the distance between the lower surface 1b of the telescopic boom shown in FIG. 5 and the rotation shaft 16 of the sheave 15 disposed at the lower end 1a of the telescopic boom, the main hook 5 and the telescopic boom 1 It is possible to avoid interference. However, since the lower end 1a of the telescopic boom is positioned in front of the traveling cab when the crane is traveling, increasing the Lc dimension deteriorates the forward visibility. Further, when the Lc dimension is increased, the boom head 17 at the tip of the telescopic boom 1 is enlarged, and the weight is increased as a whole. Therefore, it is desirable that the Lc dimension, which is the distance between the telescopic boom lower surface 1b and the rotating shaft 16 of the sheave 15, be as small as possible.

  On the other hand, in recent years, a one-cylinder expansion / contraction mechanism that uses a single expansion / contraction cylinder to expand / contract a multistage expansion / contraction boom has been put into practical use (for example, see Patent Document 2). Since the one-cylinder expansion / contraction mechanism can be applied regardless of the number of boom stages, a crane vehicle using the expansion / contraction mechanism can increase the number of boom stages as compared with the prior art, so the boom length at the time of maximum extension is large. Tend to be.

As described above, when the boom length at the time of maximum extension of the telescopic boom is increased while the maximum hoisting angle of the telescopic boom is not more than a predetermined size due to the interference between the telescopic boom and the hanging tool, Issues like this have come to be pointed out.
Japanese Utility Model Publication No. 4-14276 (page 6-8, Fig. 1) Japanese Patent Laid-Open No. 7-267484 (page 3-5, FIGS. 1 and 3)

  FIG. 6 shows a state in which the telescopic boom 1 of the crane vehicle A is set to the maximum extension length Lmax, and the suspended load 20 is being lifted on the roof of the building B with the maximum undulation angle Θmax.

  The size of the work site C of the crane vehicle A is often restricted. When the suspended load 20 is carried by a truck or the like and temporarily placed on the work site C, it must be placed in the immediate vicinity of the crane vehicle A. Often not. At this time, the working radius Ra at the position where the suspended load 20 is actually placed may be smaller than the minimum working radius Rmin when the telescopic boom 1 has the maximum extension length Lmax. In this state, even if the hanging tool 5 is hung near the ground where the hanging load 20 is placed, the hanging load 5 cannot be lifted by the hanging tool 5. Therefore, the telescopic boom 1 has to be reduced until the working radius R of the hanging tool 5 reaches the working radius Ra at the position where the suspended load 20 is placed.

  However, the telescopic operation of the telescopic boom 1 is generally slow and takes time, leading to a reduction in work efficiency. In particular, in the telescopic boom 1 using the one-cylinder expansion / contraction mechanism described above, since only the telescopic cylinder needs to run idle, the time required for expansion / contraction becomes long, and the work efficiency may be significantly reduced. There is.

  In order to solve the above-described problem, it is necessary to eliminate the contraction operation of the telescopic boom 1 in the maximum extension state, and even if the suspended load 20 is in the immediate vicinity of the crane vehicle A, the telescopic boom 1 has the maximum extension length. Even with the length Lmax, the maximum raising angle Θmax of the telescopic boom needs to be larger than that of the conventional crane so that the working radius Rmin becomes the working radius Ra of the suspended load. However, if only the maximum elevation angle Θmax is simply increased, the interference between the telescopic boom 1 and the suspension 5 becomes a problem as described above.

  Therefore, the present invention automatically performs the lifting operation of the telescopic boom or the hoisting operation of the hoisting device by the winch so that the telescopic boom and the hoisting device do not interfere even if the maximum raising angle of the telescopic boom is set larger than the conventional one. An object of the present invention is to provide an interference prevention device that regulates.

  The interference preventing device between the telescopic boom and the hanging tool described in claim 1 of the present application includes an telescopic boom pivotably supported by hoisting, hoisting driving means for driving the telescopic boom to hoist, and a wire fed from a winch. Telescopic boom in a crane, comprising: a hanging tool that is suspended through a sheave disposed at the lower end of the telescopic boom tip and suspended by the wire at the distal end of the telescopic boom; and winch drive means for driving the winch to wind up and down Is a device for preventing interference between the hoisting tool and the hoisting tool, the hoisting angle detecting means for detecting the hoisting angle of the telescopic boom, and the sheave / housing tool for detecting the distance between the sheave arranged at the lower end of the telescopic boom and the hoisting tool Based on signals from the inter-distance detecting means, the hoisting angle detecting means and the sheave / hanger distance detecting means, the hoisting driving means or the hoisting drive means or And a, a calculating means for outputting a drive restriction signal to the inch drive means.

  Furthermore, the interference preventing device between the telescopic boom and the suspended load described in claim 2 of the present application is extended from the winch, the telescopic boom pivotally supported in a hoisting manner, the hoisting driving means for driving the telescopic boom to hoist and undulate. In a crane comprising: a hanging tool that is suspended through a sheave disposed at the lower end of the telescopic boom tip and suspended from the telescopic boom tip by the wire; and winch drive means for driving the winch to wind up and down An interference prevention device between the telescopic boom and the suspended load, the hoisting angle detecting means for detecting the hoisting angle of the telescopic boom, and the sheave for detecting the distance between the sheave disposed at the lower end of the telescopic boom and the hoisting tool. Suspension distance detection means, suspension load relation information input means for inputting information related to interference between the telescopic boom and the suspension load, the undulation angle detection means, and the sheave / hanging distance detection hand And based on signals from the suspended load related information input means, it said to the telescopic boom and suspended load do not interfere, and a, a calculating means for outputting a drive restriction signal to said relief drive means or a winch drive means.

  In the telescopic boom and suspension preventing apparatus according to claim 1, the telescopic boom and the suspension are formed based on the undulation angle of the telescopic boom and the distance between the sheave and the suspension disposed at the lower end of the telescopic boom. The raising / lowering drive of the telescopic boom or the winch winding drive can be automatically regulated so as not to interfere. Therefore, even if the maximum elevation angle of the telescopic boom is made larger than before, the hoisting tool and the lower surface of the telescopic boom do not interfere when the hoisting tool is wound up.

  That is, the maximum elevation angle of the telescopic boom can be set to be larger than the conventional one so that the working radius when the telescopic boom is fully extended is smaller than the conventional one. Therefore, even if a suspended load is temporarily placed in the immediate vicinity of a crane truck that has extended the telescopic boom to the maximum, the suspended load can be lifted without reducing the telescopic boom, greatly improving the crane work efficiency. Then it becomes.

  According to the interference prevention device between the telescopic boom and the suspended load described in claim 2, the undulation angle of the telescopic boom, the distance between the sheave and the hanging tool arranged at the lower end of the telescopic boom, and the interference between the telescopic boom and the suspended load. On the basis of the information related to the above, it is possible to automatically restrict the raising / lowering drive of the telescopic boom or the hoisting driving of the winch so that the telescopic boom and the suspended load do not interfere with each other. Therefore, even when the crane work has a large elevation angle of the telescopic boom, the suspended load and the lower surface of the telescopic boom do not interfere with each other when the suspended load is hoisted.

  In other words, when an operator lifts a suspended load at the crane work site, it is not necessary to pay attention to the interference between the suspended load and the telescopic boom, so that the crane work efficiency is improved and the fatigue during crane operation is reduced. The Rukoto.

  FIG. 1 is a control block diagram of an apparatus for preventing interference between a telescopic boom and a hanging tool or a suspended load according to an embodiment of the present invention.

  The device for preventing interference between the telescopic boom and the hanging tool or the hanging load includes a detecting means comprising a undulation angle detecting means 30, a sheave / hanger distance detecting means 31, and a hanging load related information input means 32, and a detecting means from the detecting means. Based on the signal, the telescopic boom and the hoisting tool or the suspended load are configured to include a hoisting driving means 46 or a computing means 33 for outputting a drive restriction signal to the winch driving means 45 so as not to interfere with each other. Details of each component will be described below.

  The undulation angle detection means 30 detects the undulation angle of the telescopic boom, and can be used in combination with an undulation angle detector used in an overload prevention device conventionally attached to a crane vehicle.

  The sheave / hanger distance detection means 31 includes a wire feed amount detector 34, a wire multiplier input device 35, a hanger initial position detector 36, and a sheave / hanger distance calculator 37.

  The wire feed amount detector 34 detects the length of the wire fed from the winch by detecting the rotation amount of the winch drum, and does not contact the irregularities provided at predetermined intervals on the flange outer peripheral surface of the winch drum. These are read out as pulses by the detector, converted into the wire feed length, and the wire feed length is detected.

  The wire multiplier input device 35 is provided in the cab, and is used by an operator to manually input the number of wires to be attached to the hanging tool used for the crane work at that time.

  The suspension initial position detector 36 detects a suspension position serving as a reference position of the distance between the sheave disposed at the lower end of the telescopic boom and the suspension, and is an overwind position detection that is always used for a mobile crane. A device is used in combination, and is used as a hanging device initial position detector 36. In this case, the position of the hanging tool when the overwinding position detector operates is detected as the initial position of the hanging tool.

  The sheave / hanger distance calculator 37 receives signals from the wire feed amount detector 34, the wire multiplier input device 35, and the hanger initial position detector 36 described above, and is disposed at the lower end of the telescopic boom tip. Calculate the distance between the sheave and the hanger. That is, the distance at which the overwind position detector detects the hanging tool is used as a reference distance, and the numerical value obtained by dividing the wire length fed from that position by the wire multiplier is added to the reference distance as the distance at which the hanging tool is separated. The numerical value is calculated as the distance between the sheave and the hanging tool.

  The configuration of the sheave / suspender distance detecting means 31 is not limited to that described above, and other means for directly detecting the distance between the sheave / suspender can be applied. For example, it is possible to use a means for suspending an ultrasonic distance detector from the lower end of the telescopic boom tip toward the hanger and detecting the position of the hanger with ultrasonic waves.

  The suspended load related information input means 32 is provided in the cab of the crane vehicle, and includes a suspended implement / suspended load distance input device 38 and a suspended load dimension input device 39.

  FIG. 3 illustrates the lifting tool / suspended load distance La input by the lifting tool / suspended load distance input unit 38 and the suspended load dimension Lb input by the suspended load dimension input unit 39.

  The distance La between the suspended tool and the suspended load is defined between the hook lower surface of the main wound hook 5 and the upper surface of the suspended load 42 when the suspended load 42 is suspended from the suspended tool 5 (main wound hook) using the sling wire 41. The distance is entered. Moreover, the maximum dimension of the upper surface of the suspended load 42 in the suspended state is input as the suspended load dimension Lb. For example, if the suspended load 42 has a rectangular shape in plan view, the length of the diagonal line of the rectangle is input.

  Note that the configuration of the suspended load related information input means 32 is not limited to the above, but a suspended load that is related to the interference between the telescopic boom and the suspended load when the suspended load is suspended by the hanging tool. Various other formats can be employed as long as the hanging information can be input.

  The computing means 33 includes an extendable boom, a hanging tool or distance between suspended loads calculating means 43 and a restriction signal output means 44.

  First, in the case of only a hanging tool that does not have a suspended load, the distance calculating unit 43 receives the undulation angle signal Θ from the undulation angle detecting unit 30, and the sheave / hanging unit distance detecting unit 31 receives the undulation angle signal Θ. A distance signal Ld is received. The distance calculating means 43 stores necessary data such as the distance Lc between the telescopic boom lower surface 1b and the rotating shaft 16 of the sheave 15 disposed on the telescopic boom tip lower portion 1a, and the widthwise dimension Lh of the suspension 5. Yes.

  Then, the distance calculating means 43 calculates the distance Le between the telescopic boom lower surface 1b and the suspension 5 shown in FIG. 2 which changes every moment based on the input signal and the stored data, and outputs the distance Le to the restriction signal output means 44.

  When the distance Le between the lower surface 1b of the telescopic boom and the lifting tool 5 reaches a predetermined value, the restriction signal output means 44 further increases the lifting of the lifting tool 5 or raises the telescopic boom 1 because the distance Le decreases. Then, it is determined that there is a possibility of interference between the telescopic boom 1 and the hanging tool 5, and a drive restriction signal is output to the winch driving means 45 or the undulation driving means 46.

  Next, in the case where a suspended load is suspended from the suspension tool, the telescopic boom and the suspension tool or suspended load distance calculation means 43 receives the undulation angle signal Θ from the undulation angle detection means 30, and the sheave and suspension A sheave / hanger distance signal Ld is received from the tool distance detector 31 and a hanger / hanger distance La and a load dimension Lb are received from the hanger related information input means 32. The distance calculating means 43 stores necessary data such as a distance Lc between the telescopic boom lower surface 1b and the rotating shaft 16 of the sheave 15 disposed on the telescopic boom tip lower portion 1a, and a longitudinal dimension Lg of the suspension 5. ing.

  The distance calculation means 43 calculates the distance Lf between the telescopic boom lower surface 1b and the suspended load 42 shown in FIG. 3 and changes to the regulation signal output means 44 based on the input signal and stored data.

  When the distance Lf between the lower surface 1b of the telescopic boom and the suspended load 42 reaches a predetermined numerical value, the restriction signal output means 44 causes further lifting of the suspended load 42 or elevation of the telescopic boom 1 because the distance Lf decreases. Then, it is determined that there is a possibility of interference between the telescopic boom 1 and the suspended load 42, and a drive restriction signal is output to the winch drive means 45 or the undulation drive means 46.

  The winch driving means 45 is conventionally known, and a winch operating means 50 that outputs a winch operating signal, a winch switching valve means 51 that is switched by the winch operating signal, and an operation interposed between the both means. Signal blocking means 52.

  When a restriction signal is output from the restriction signal output means 44 of the calculation means 33 to the operation signal blocking means 52, the operation signal from the winch operation means 50 is blocked by the operation signal blocking means 52, and the winch switching valve means. No output to 51 and the drive of the winch is regulated.

  Similarly, the undulation driving means 46 is conventionally known, and the undulation operation means 53 that outputs the undulation operation signal, the undulation switching valve means 54 that is switched by the undulation operation signal, and an intervening unit. And an operation signal blocking means 55 to be mounted.

  When a restriction signal is output from the restriction signal output means 44 of the calculation means 33 to the operation signal blocking means 55, the operation signal from the undulation operation means 53 is blocked by the operation signal blocking means 55, and the undulation switching valve means. No longer being outputted to 54, the up-and-down driving of the telescopic boom is regulated.

  The operation of the interference preventing device between the telescopic boom and the hanging tool or the suspended load having the above-described configuration is as follows.

  First, in the case of only a hanging tool that does not have a suspended load, the calculation means 33 calculates the distance Le between the telescopic boom lower surface 1b and the hoisting tool 55 shown in FIG. When the distance Le to the tool 5 reaches a predetermined value, it is determined that further hoisting of the lifting tool 5 or raising of the telescopic boom 1 may cause interference between the telescopic boom 1 and the hoisting tool 5, and the winch. A drive restriction signal is output to the drive means 45 or the undulation drive means 46. Then, since the hoisting operation or the hoisting operation of the winch is restricted, it is possible to prevent the hanging tool 5 from interfering with the telescopic boom 1.

  Next, in the case where a suspended load is suspended from the hanging tool, the computing means 33 calculates the distance Lf between the telescopic boom lower surface 1b and the suspended load 42 shown in FIG. When the distance Lf between the suspension load 42 and the suspended load 42 reaches a predetermined value, it is determined that further lifting of the suspended load 42 or elevation of the telescopic boom 1 may cause interference between the telescopic boom 1 and the suspended load 41. The drive restriction signal is output to the winch drive means 45 or the undulation drive means 46. Then, since the hoisting operation or the hoisting operation of the winch is restricted, the suspended load 42 is prevented from interfering with the telescopic boom 1.

  As described above, in the interference preventing device according to the present invention, the telescopic boom and the hoisting tool are prevented from interfering with each other based on the undulation angle of the telescopic boom and the distance between the sheave disposed at the lower end of the telescopic boom and the hoisting tool. It is possible to automatically regulate the raising / lowering drive or the winch winding drive. Therefore, even if the maximum elevation angle of the telescopic boom is made larger than before, the hoisting tool and the lower surface of the telescopic boom do not interfere when the hoisting tool is wound up.

  In other words, the maximum elevation angle of the telescopic boom can be set larger than before so that the working radius when the telescopic boom is fully extended becomes smaller than before. Therefore, even if a suspended load is temporarily placed in the immediate vicinity of a crane truck that has extended the telescopic boom to the maximum, the suspended load can be lifted without reducing the telescopic boom, greatly improving the crane work efficiency. Then it becomes.

  Further, in the interference prevention device of the present invention, the telescopic boom and the suspension boom are based on the undulation angle of the telescopic boom, the distance between the sheave disposed at the lower end of the telescopic boom and the suspension, and the information on the interference between the telescopic boom and the suspended load. The raising / lowering drive of the telescopic boom or the winch hoisting drive can be automatically regulated so as not to interfere with the load. Therefore, even when the crane work has a large elevation angle of the telescopic boom, the suspended load and the lower surface of the telescopic boom do not interfere with each other when the suspended load is hoisted.

  In other words, when an operator lifts a suspended load at the crane work site, it is not necessary to pay attention to the interference between the suspended load and the telescopic boom, so that the crane work efficiency is improved and the fatigue during crane operation is reduced. The Rukoto.

It is a control block diagram of the interference prevention device between the telescopic boom and the hanging tool or the suspended load according to the implementation of the present invention. It is a figure explaining interference prevention with a telescopic boom and a hanging tool. This figure shows the distance La between the suspended tool and the suspended load input by the suspended load / suspended load distance input device and the suspended load dimension Lb input by the suspended load dimension input device, and prevents interference between the telescopic boom and the suspended load. FIG. It is a figure explaining the technique shown by patent document 1. FIG. It is a figure explaining the setting of the conventional maximum undulation angle. It is explanatory drawing of the conventional crane operation | work.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 is a telescopic boom, 1a is a telescopic boom tip lower part, 1b is a telescopic boom lower surface, 5 is a hanging tool (main winding hook), 15 is a sheave arranged at the telescopic boom tip lower part, 16 is a support shaft of the sheave, 17 is a boom Head, 30 is a undulation angle detection means, 31 is a sheave / hanger distance detection means, 32 is a load-related information input means, 33 is a calculation means, 34 is a wire feed amount detector, 35 is a wire multiplier input device, 36 is a suspension initial position detector, 37 is a sheave / suspender distance calculator, 38 is a suspension / suspended distance input device, 39 is a suspended load size input device, 42 is a suspended load, 43 is a telescopic boom, Suspension or suspended load distance calculating means 44, restriction signal output means 44, winch driving means 45, hoisting driving means 46, winch operating means 51, winch switching valve means, 52 and 55 interrupting operation signals Means 53, undulating operation means, 5 Switching valve means for undulations

Claims (2)

A telescopic boom pivotably supported by the hoist, hoisting driving means for driving the hoisting boom, and a wire fed from the winch is suspended through a sheave disposed at the lower end of the telescopic boom, and the telescopic boom tip is moved by the wire. An apparatus for preventing interference between a telescopic boom and a hanging tool in a crane, comprising: a hanging tool that is suspended on a winch; and a winch driving means that drives the winch to wind up and down,
Undulation angle detection means for detecting the undulation angle of the telescopic boom;
A sheave / hanger distance detecting means for detecting a distance between a sheave and a hanger disposed at the lower end of the telescopic boom tip;
Based on the signals from the hoisting angle detecting means and the sheave / hanger distance detecting means, a calculating means for outputting a drive restriction signal to the hoisting driving means or the winch driving means so that the telescopic boom and the hoisting tool do not interfere with each other. A device for preventing interference between the telescopic boom and the hanging tool. A telescopic boom pivotably supported by the hoist, hoisting driving means for driving the hoisting boom, and a wire fed from the winch is suspended through a sheave disposed at the lower end of the telescopic boom, and the telescopic boom tip is moved by the wire. An apparatus for preventing interference between a telescopic boom and a suspended load in a crane, comprising: a hanging tool that is suspended on a winch; and a winch driving means that drives the winch to wind up and down,
Undulation angle detection means for detecting the undulation angle of the telescopic boom;
A sheave / hanger distance detecting means for detecting a distance between a sheave and a hanger disposed at the lower end of the telescopic boom tip;
Suspended load related information input means for inputting information related to the interference between the telescopic boom and the suspended load;
Based on signals from the hoisting angle detecting means, the sheave / hanger distance detecting means, and the load-related information input means, the hoisting driving means or the winch driving means is controlled to prevent interference between the telescopic boom and the hoisting load. An apparatus for preventing interference between a telescopic boom and a suspended load, comprising: an arithmetic means for outputting a signal.

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