JP2008156013A - Crane having revolving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly maintain a neutral position of a load holding device irrespective of elongation of a rope body. <P>SOLUTION: This crane is provided with the revolving device 31 having a pushing and pulling device 32 winding four elevating ropes 22A, 22B payed out from a winch drum 24 of a crab carrier 18 around four running blocks 26A, 26B in four corners of a spreader 23, pulling them out to a crab carrier 18 side to suspend them, pushing and pulling a pair of elevating ropes 22A for revolving pulled out of two running blocks 26A at diagonal positions of the spreader 23, and revolving the spreader 23 around a vertical axis. This crane is also provided with a revolving operation device 40 having a revolving operation lever for driving the pushing and pulling device 32 to revolve the spreader 23, a neutral operation button for driving the pushing and pulling device 32 to bring the spreader 23 to a neutral position, and a neutral setting button for setting the neutral position again by storing the values detected by an angle detector 38 for detecting pushing and pulling positions of the elevating ropes 22A for revolving. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a crane that suspends and conveys a load such as a container and has a turning device capable of turning the load.

In a conventional container crane, for example, four lifting lines fed from a take-up drum provided on the base end side (land side) of the girder are provided at the four corners of the spreader (load holding tool) from the trolley fixed pulley. These four hoisting ropes are hung around a moving pulley and taken out from the fixed pulley of the trolley to the tip side (sea side) of the girder. For example, Patent Literature 1 discloses a device having a turning device that selectively pushes and pulls a lifting rope of a book to turn a spreader.
JP 2001-341974 A

  In the above-described swivel device, the neutral position of the spreader is set so that the spreader can properly match the upper surface of the container every time the hoisting line is newly replaced during maintenance. However, each hoisting line extends as the usage time elapses, and the extension amounts of the hoisting lines differ from each other, so that the neutral position of the spreader changes. As a result, it is necessary to adjust the position of the spreader every time the spreader is attached to the container, and there is a problem that workability is lowered.

  An object of the present invention is to solve the above-mentioned problems and to provide a crane having a turning device that does not deteriorate workability even when the cable body is stretched.

  According to the first aspect of the present invention, the four hoisting cables fed out from the winch drum are respectively wound around the four movable pulleys provided on the four corner sides of the load holding device from the moving body, and then pulled out to the moving body side. A crane having a swiveling device for turning a load holding tool around a vertical axis by pushing and pulling a pair of lifting cables drawn out from two movable pulleys at diagonal positions of the load holding tool in a relative direction; And a swiveling device for operating the swivel device by providing the swivel device with a push / pull device for pushing and pulling the pair of hoisting ropes in a relative direction and a lifting / lowering position detecting means for detecting a push / pull position of the hoisting rope. A turning operation unit that drives the push-pull device to turn the load holding device, a neutral operation unit that drives the push-pull device to place the load holding device in a neutral position, and a detection value of the lifting / lowering position detection means Store in the controller to create a new neutral position It is provided with a and falling setting section.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the push-pull device is swingable about a fulcrum, and the push-down lines are respectively connected to both ends in the length direction with a predetermined interval. A pull-swing drive lever and a swing drive device that tilts the push-pull drive lever are provided, and the lifting / lowering position detecting means is constituted by an angle detector that detects the tilt angle of the push-pull drive lever. .

  According to the first aspect of the present invention, the neutral operation portion of the turning operation device sets the load holding tool to the neutral position, confirms whether the load holding tool is actually in the neutral position, and the load holding tool is displaced from the neutral position. In this case, the pushing / pulling device is driven by the turning operation unit to turn the load holding tool to the neutral position. Then, the neutral position setting unit reads the current push / pull position of the pair of hoisting ropes from the detection value of the hoisting rope position detecting means, and stores this in the controller as a new neutral position. Therefore, even if the amount of extension differs for each hoisting line, the neutral position can always be set to an appropriate position by resetting, and when the load holding device is lowered to the upper surface of the load or the load is fixed. It is possible to improve the workability of the cargo handling work such as when it is placed at the position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
A transfer crane having a turning device according to the present invention will be described.
As shown in FIG. 1, the transfer crane 11 includes a pair of left and right sill beams 13 supported via a plurality of movable bogies 12, columns 14 erected at front and rear positions of the sill beams 13, and A portal carriage 16 is constituted by a pair of front and rear girders 15 spanned between the upper end portions of the left and right columns 4. A club carriage (moving body) 18 having a cockpit 17 is disposed between the front and rear girders 15 so as to be movable in the transverse direction along the length direction of the girder 15. Further, as shown in FIG. 2, a spreader (load holding tool) 23 is supported by a lift winch device 21 provided on the club carriage 18 via four (or four sets) lifting / lowering lines 22A and 22B so as to be movable up and down. Yes. The spreader 23 is provided with twist locks (not shown) that are detachably attached to the container C at the bottom corners.

  In the lift winch device 21, the base ends of the four hoisting ropes 22 </ b> A and 22 </ b> B are wound around a winch drum 24 that is driven to rotate forward and backward by a winch drive device (not shown) via a speed reducer. The tip ends of the four lifting ropes 22A and 22B fed out from the winch drum 24 are wound directly around the movable pulleys 26A and 26B arranged on the four corners on the upper surface of the spreader 23 via the fixed pulley 25. Further, it is pulled out to the club carriage 18 side. Of the four lifting ropes 22A and 22B, the pair of lifting ropes 22A drawn from the movable pulley 26A at one diagonal position of the spreader 23 is introduced into the turning device 31 of the club carriage 18 to be turned up and down. A pair of hoisting ropes 22 </ b> B configured as the ropes 22 </ b> A and pulled out from the movable pulley 26 </ b> B at the other diagonal position are configured as a fixing hoisting rope 22 </ b> B connected to the fixing bracket 26 of the club carriage 18.

  The turning hoisting rope 22A derived from the movable pulley 26A at the diagonal position by the lift winch device 21 is introduced into the pushing / pulling device 32 of the turning device 31 via the turning pulley 28. The spreader 23 can be turned around the vertical axis by pushing and pulling the lifting hoist 22 </ b> A in the relative direction. As shown in FIG. 3, the push / pull device 32 has a push / pull drive lever 34 supported so as to be swingable around a fulcrum shaft (fulcrum) 33, and on both ends of the fulcrum shaft 33 in the length direction. The swivel hoisting ropes 22A are connected to each other through pins 34a and 34b at equal intervals. A swing drive device (electric jack) 36 that tilts the push / pull drive lever 34 is provided, and an output shaft 36a of the swing drive device 36 is connected to one end (upper end) of the push / pull drive lever 34 via a connecting pin 37. Part). Further, in order to detect the push / pull position of the turning hoisting rope 22A, an angle detector (potentiometer) 38 which is a hoisting line position detecting means for detecting an angle formed by the push / pull drive lever 34 and the output shaft 36a in the connecting pin 37. Is provided.

  As shown in FIG. 4, the turning operation device 40 for operating the turning device 31 drives the push / pull device 32 to push / pull the turning lift 22A to turn the spreader 23 around the vertical axis. The lever (turning operation part) 42, the neutral operation button (neutral operation part) 43 for driving the push-pull device 32 and setting the spreader 23 to the neutral position in the turning direction, and the detection value of the angle detector 32 are stored. Neutral setting buttons (neutral setting portions) 44 for resetting the neutral position are provided, and each is provided in the cockpit 17. Then, the detection signal of the angle detector 38 and the operation signals of the turning operation lever 42, the neutral operation button 43, and the neutral setting button 44 are input to the controller 41, and the operation signal is output from the controller 41 to the turning drive device 36. The

Next, with reference to FIG. 5, the neutralization position resetting operation of the spreader 23 by the turning operation device 40 will be described.
1) The neutral operation button 43 is turned on, the turning drive device 36 is operated to drive the push / pull drive lever 34, and the turning elevator 22A is pushed and pulled to bring the spreader 23 into the neutral position (STEP 1). The neutral position at this time is an initial set value (or reset value) that is set when the hoisting ropes 22A and 22B are replaced and stored in the controller 41.

2) It is confirmed whether the spreader 23 is in the neutral position by visual observation from the cockpit 17 or by the operator on the ground side (STEP 2).
3) When the spreader 23 is deviated from the neutral position, the turning operation lever 42 is operated to drive the turning drive device 36 while visually checking the posture of the spreader 23, and the push / pull drive lever 34 is used to drive the turning drive device 36. The swivel hoisting rope 22A is pushed and pulled, and the spreader 23 is turned right or left to stop at the neutral position (STEP 3).

4) It is confirmed again whether the spreader 23 is in the neutral position by visual observation from the cockpit 17 or by the operator on the ground side (STEP 4).
5) When the spreader 23 is in the neutral position, the neutral setting button 43 is turned on, and the detection signal of the angle detector 38 is stored in the controller 41 as the neutral position in the turning direction and reset.

  According to the first embodiment, when the spreader 23 is set to the neutral position by the neutral operation button 43 of the turning operation device 40, whether the spreader 23 is actually at the neutral position in the turning direction is visually checked and shifted. In this case, after the push / pull device 32 is driven by the turning operation lever 42 to set the spreader 23 to the neutral position, the detection value of the angle detector 38 is read by the neutral position setting button 43, and this is used as a new neutral position. Reset to 41. Thereby, even if the extension amounts of the hoisting ropes 22A and 22B may be different, the neutral position can be reset and the proper neutral posture can be obtained at all times. Is not reduced.

  In the above embodiment, the hoisting line position detecting means is the angle detector 38 for detecting the connecting angle at the connecting pin 37 of the output shaft 36a of the push / pull drive lever 34 and the turning drive device 36. The present invention is not limited to this as long as the push / pull position of the rope 22A can be detected. For example, from an angle detector provided on the fulcrum shaft 33 for detecting the tilt angle of the push / pull drive lever 34 or a fixed reference point. From the distance to the free end of the push / pull drive lever 34, the inclination angle of the push / pull drive lever 34 is obtained, the distance sensor for obtaining the push / pull position of the swivel hoisting rope 22A, and the output shaft 36a from the rotation angle of the turn drive device 36 It may be a rotary encoder that measures the retraction amount and obtains the push / pull position of the turning hoisting rope 22A.

  Further, the neutral position of the spreader 23 is confirmed visually, and the turning operation lever 42 is operated. For example, the measured value obtained by the distance sensor provided in the column 14 or the club carriage 18 or the image obtained by the imaging device. It is also possible to manually operate the turning operation lever 42 based on the above, or to automatically operate the turning drive device 36 based on the measurement value or image by the controller 41 to reset the neutral position.

[Embodiment 2]
A second embodiment of a transfer crane having a turning device according to the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment, of the four lifting ropes 22A and 22B, the pair of lifting ropes 22A derived from the movable pulley 26A at one diagonal position is used as the pivoting lifting rope, and the other diagonal position is set. The pair of hoisting ropes 22B derived from the movable pulley 26B is used as the fixing hoisting rope. In the second embodiment, the other hoisting rope 22B is also used as the hoisting hoisting rope, and another turn is made via the turning pulley 28 '. It is introduced into the device 31 ′.

Since these two swiveling devices 31 and 31 ′ have the same structure, the same reference numerals are given with “′” and description thereof is omitted.
Further, the turning operation device 40 ′ is provided with turning operation levers 42 and 42 ′ for operating the turning devices 31 and 31 ′, respectively, and the detection signals of the two angle detectors 38 and 38 ′ are respectively input to the controller 41. Further, the two turning drive devices 36 and 36 ′ are respectively operated by an operation signal from the controller 41.

  According to the above configuration, by using the two swiveling devices 31 and 31 ′, the spreader 23 is swung around the vertical axis, and of course, the swivel hoisting cords fed out from the front and rear movable pulleys 26A and 26B, respectively. The spreader 23 can be displaced in the front-rear direction by simultaneously pushing and pulling 22A, 22B in the relative direction by the push-pull devices 32, 32 ′, and the swivel hoisting cords fed out from the left and right movable pulleys 26A, 26B. By simultaneously pushing and pulling 22A and 22B by the push / pull devices 32 and 32 ', the spreader 23 can be displaced in the left-right direction. Therefore, the neutral position in the second embodiment is a neutral position including the front-rear and left-right directions in the turning direction.

According to the second embodiment, the same effects as those of the first embodiment can be achieved.
[Embodiment 3]
Embodiment 3 of a container crane having a turning device according to the present invention will be described with reference to FIG. The same members as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  The container crane 51 is guided by a pair of left and right girders 53 projecting from the land side to the sea side through a plurality of support columns 52 so that the trolley 54 can be driven and driven. The spreader 23 is suspended so as to be movable up and down via a pair of lifting ropes 22A and 22B. The winch drum 24 of the lift winch device 55 of the container crane 51 and the winch drive device (not shown) for rotating the winch drum 24 in the forward and reverse directions via a speed reducer are provided on the base end side (land side) of the garter 53. On the other hand, the swivel devices 31 and 31 ′ are installed on the tip side (sea side) frame of the girder 53.

  The four lifting ropes 22A and 22B fed out from the winch drum 24 are respectively wound around the movable pulleys 26A and 26B of the spreader 23 via the fixed pulley 25A of the trolley 54, and are pulled out from the movable pulleys 26A and 26B. Of the two hoisting ropes 22A and 22B, two hoisting ropes 22A drawn out from the movable pulley 26A at the diagonal position are respectively introduced into the turning device 31 via the fixed pulley 25A of the trolley 54, and the other diagonal. The two lifting ropes 22B drawn from the movable pulley 26B at the position are introduced into the turning device 31 ′ via the fixed pulley 25B of the trolley 54, respectively.

The angle detectors 38 and 38 'and the turning operation device 40 of the container crane 51 are configured in the same manner as in the second embodiment.
According to the third embodiment, the same operational effects as those of the second embodiment can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general | schematic whole perspective view which shows Embodiment 1 of the transfer crane which has a turning apparatus which concerns on this invention. It is a schematic perspective view which shows the drive system of the lift winch of a transfer crane. It is a side view which shows a turning apparatus. It is a schematic block diagram which shows a turning operation apparatus. It is a flowchart which shows neutral setting operation | movement. It is a schematic perspective view which shows Embodiment 2 of the transfer crane which has a turning apparatus which concerns on this invention, and shows the drive system of a lift winch. It is a schematic block diagram which shows a turning operation apparatus. It is a schematic perspective view which shows Embodiment 3 of the container crane which has a turning apparatus which concerns on this invention, and shows the drive system of a lift winch.

Explanation of symbols

C container 11 transfer crane 15 girder 16 portal trolley 17 cockpit 18 club trolley 21 lift winch device 22A, 22B lifting rope 23 spreader 24 winch drum 26A, 26B moving pulley 28 turning pulley 31, 31 'turning device 32, 32' pushing Pulling device 33, 33 'fulcrum shaft 34, 34' push-pull drive lever 36, 36 'turning drive device 36a output shaft 37 connecting pin 38 angle detector 40 turning operation device 41 controller 42, 42' turning operation lever 43 neutral operation button 44 Neutral setting button 51 Container crane 53 Girder 54 Trolley 55 Lift winch device

Claims (2)

Four hoisting lines fed out from the winch drum are respectively wound around four moving pulleys provided on the four corners of the load holding device from the moving body, and then pulled out to the moving body side, and the diagonal position of the load holding device A crane having a turning device for turning a load holding tool around a vertical axis by pushing and pulling a pair of lifting ropes drawn from the two movable pulleys in a relative direction,
The swivel device is provided with a push-pull device that pushes and pulls the pair of lift ropes in a relative direction, and a lift rope position detection means that detects a push-pull position of the lift rope,
A turning operation unit that operates the turning device, a turning operation unit that drives the push-pull device to turn the load holding tool, and a neutral operation unit that drives the push-pull device and sets the load holding tool to a neutral position; A crane having a turning device provided with a neutral setting unit that stores a detection value of the hoisting line position detecting means in a controller and sets a new neutral position. The push-pull device is swingable around a fulcrum and has a push-pull drive lever with lifted ropes connected to both ends in the length direction at predetermined intervals, and a swing drive device that tilts the push-pull drive lever And are provided,
The crane having a turning device according to claim 1, wherein the hoisting line position detecting means is constituted by an angle detector that detects an inclination angle of the push-pull drive lever.

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