JP2008247587A - Jib elevation monitor for deck crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a switch used for detecting the elevating operation of a jib and reduce cost. <P>SOLUTION: A striker 51 projecting in a radial direction is attached to the elevating drum rotation interlocking shaft 28 of a limit switch unit 25 provided with the elevating drum rotation interlocking shaft 28 interlocked with the rotation of an elevating drum 12, a striker 39 sliding in a longitudinal direction by the rotation of the elevating drum rotation interlocking shaft 28, and micro switches 41, 42 for detecting the upper limit and lower limit of the elevating operation of the jib from the movement of the striker 39, which are arranged in a limit switch box 26. A micro switch 52 for jib emergency stop is arranged in a position corresponding to the rotation locus of the striker 51. The micro switch 52 detects the rotating direction of the elevating drum from a direction hit by the striker 51 to monitor the lowering operation or rising operation of the jib. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a deck crane jib elevation monitoring apparatus used for monitoring the above-mentioned jib elevation operation in order to prevent the possibility that the deck crane jib will fall down against the driving operation.

  There is a deck crane as one of cargo handling machines that are installed on the deck of a ship such as a cargo ship and are used for loading and unloading maritime cargo.

  As shown in FIG. 2, the general structure of such a deck crane is that a machine room is mounted on the top of a cylindrical crane post 1 having a required height installed on a ship deck (not shown). A rotator 2 having a cab 3 and an operator cab 4 is pivotably attached. Further, a base end portion of a jib (boom) 5 is attached to the rotating body 2 so as to be able to be lifted and lifted, and a lifting winch for lifting the jib 5 up and down via a wire rope is installed in the machine room 3. 6, a winch 9 for winding up and down a wire rope 8 connected to a hook 7 suspended from the tip of the jib 5, and turning for turning the rotating body 2 on the crane post 1 The unit 10 is provided (for example, refer to Patent Document 1).

  FIG. 3 shows the configuration of the above-described hoisting winch 6 and the winding winch 9 more specifically, as follows.

  That is, a pair of left and right frames 11a and 11b having a required height dimension in the vertical direction are provided at required locations in the machine room 3. The hoisting winch 6 has an elevating drum 12 disposed at an upper position between the left and right frames 11a and 11b, and a drum shaft 13 on one end side (right side in FIG. 3) of the elevating drum 12 is It is rotatably supported by a bearing (not shown) provided at the upper position of the corresponding one of the frames 11a. And the drum shaft (not shown) on the other end side (the left side in FIG. 3) of the above-mentioned lifting and lowering drum 12 is connected to a speed reducer 14 attached to the upper position of the corresponding other frame 11b. The speed reducer 14 is connected to a hydraulic motor 15 for raising and lowering.

  The winding winch 9 has a winding drum 16 disposed at a lower position between the left and right frames 11a and 11b, and a drum shaft 17 on one end side (right side in FIG. 3) of the winding drum 16 corresponds to the winding winch 9. It is rotatably supported by a bearing (not shown) provided at the lower position of one frame 11a. A drum shaft (not shown) on the other end side (left side in FIG. 3) of the winding drum 16 is connected to a speed reducer 18 provided at a lower position of the corresponding other frame 11b. The reduction gear 18 is connected to a winding hydraulic motor 19.

  Reference numeral 20 denotes a brake attached to the lifting hydraulic motor 15, and reference numeral 21 denotes a brake attached to the winding hydraulic motor 19.

  In the case where the jib 5 of the deck crane having the above-described configuration is moved up and down, when the driver operates a handle for a jib lifting operation (not shown) in the driver's cab 4, the lifting hydraulic motor 15 is turned on in response to the operation. By driving forward and backward, the jib elevating wire rope is unwound by unwinding the jib elevating wire rope from the elevating drum 12, and the jib elevating wire rope is applied to the elevating drum 12. The jib 5 can be erected (raised) by winding.

  By the way, when the amount of oil leaking from the lifting hydraulic motor 15 is excessive due to deterioration over time when the jib 5 is lifted, the driver raises the jib lifting operation handle (not shown). Even if the operation is moved to the position where the operation is commanded, the unwinding of the wire rope for lifting the jib from the lifting drum 12 does not actually stop, and the jib 5 may move in the lying down direction (lowering direction). Is concerned.

  For this reason, in the above-described deck crane, if the jib 5 falls down against the operation of the jib elevating handle (not shown) in the cab 4, the hydraulic pump (not shown) of the deck crane is operated. It is required to stop the electric motor immediately and to make the jib 5 emergency stop. For this purpose, it is necessary to monitor the raising / lowering operation of the jib 5.

  For this purpose, the present applicant considers a jib elevation monitoring device 22 as shown in FIGS. That is, the jib elevating monitoring device 22 projects the drum shaft 13 on one end side of the elevating drum 12 to the outside of the one frame 11a by a required dimension, and the projecting end portion of the drum shaft 13 A striker 23 protruding in the radial direction with a required dimension is attached. Further, a jib emergency stop limit switch 24 is arranged at a position corresponding to a circular path through which the tip of the striker 23 passes when the striker 23 rotates integrally with the drum shaft 13 of the hoisting drum 12. It is configured to be attached to the one frame 11a via an attachment member (not shown). As a result, each time the raising / lowering drum 12 rotates once, the head part (actuator part) 24a of the jib emergency stop limit switch 24 is moved by the striker 23 attached to the drum shaft 13 of the raising / lowering drum 12. Since the head portion 24a is struck by the striker 23, the rotation direction of the hoisting drum 12 is controlled by the jib emergency stop limit switch 24 based on the direction when the head portion 24a is struck by the striker 23. It is possible to monitor whether the jib 5 is moving in the inclining direction or the standing direction by detecting which side is the side.

  Therefore, for example, the striker 23 on the drum shaft 13 of the hoisting drum 12 is operated although the driver is operating the jib elevating handle to the jib erecting side in the cab 4 (see FIG. 2). However, when the head part 24a of the jib emergency stop limit switch 24 is tapped twice in the unwinding direction of the hoisting drum 13, the electric motor for operating the hydraulic pump (not shown) is immediately stopped. It becomes possible to make the jib 5 emergency stop.

  By the way, in general, in the deck crane, with respect to the raising / lowering operation of the jib 5, the cargo handling minimum turning radius which is the limit (upper limit) on the standing side of the jib 5 and the cargo handling which is the limit (lower limit) on the lodging side of the jib 5 at the time of cargo handling. It is necessary to limit the cargo handling range by defining the maximum turning radius and the upper and lower limits of the lifting and lowering operation of the hook 7.

  For this purpose, the present applicant detects the upper and lower limits of the lifting operation of the jib 5 as described above and the upper and lower limits of the lifting and lowering movement of the hook 7 to limit the cargo handling range in the deck crane. As a device, it is considered to provide a limit switch unit 25 as shown in FIGS.

  Specifically, the limit switch unit 25 includes a box-shaped box body 26a having an opening on the front surface and flat in the front-rear direction, and a packing for closing the front opening of the box body 26a so as to be openable and closable. A limit switch box 26 having a waterproof structure including a lid 26 b provided with 27 is provided. The limit switch box 26 is attached to the front side of one frame 11a that supports the lifting drum 12 and the winding drum 16.

  In the middle part of the box body 26a in the vertical direction, a lifting drum rotation interlocking shaft 28 and a winding drum rotation interlocking shaft 29 extending in the horizontal direction are arranged side by side. Both end portions in the longitudinal direction are rotatably supported by the left and right side wall portions of the box body 26a through bearings 30, respectively.

  One end portion (the right end portion in FIG. 5 (a)) of the up-and-down drum rotation interlocking shaft 28 is protruded by a required dimension outward from the bearing 30, and a sprocket wheel 31 is attached to the protruding end portion. Further, an endless chain 33 is formed between the sprocket wheel 31 and a chain wheel 32 attached to one end of the drum shaft 13 on one end side of the lifting drum 12 that protrudes outward from the one frame 13. Hang around. Thus, when the lifting drum 12 rotates, the lifting drum rotation interlocking shaft 28 is rotated in the same direction as the lifting drum 12 via the chain wheel 32, the chain 33, and the sprocket wheel 31. It is.

  One end portion of the winding drum rotation interlocking shaft 29 (the right end portion in FIG. 5 (a)) protrudes outward from the bearing 30 by a required dimension, and does not interfere with the sprocket wheel 31 at the protruding end portion. In addition, a sprocket wheel 34 is attached. Further, the chain 36 is endlessly formed between the sprocket wheel 34 and the chain wheel 35 attached to the protruding end portion of the drum shaft 17 of the winding drum 16 protruding outward from the one frame 11a. Hang around. Thus, when the winding drum 16 rotates, the winding drum rotation interlocking shaft 29 is rotated in the same direction as the winding drum 16 via the chain wheel 35, the chain 36, and the sprocket wheel 34. It is.

  Reference numeral 37 denotes a tension pulley for adjusting the tension of the chains 33 and 36.

  Furthermore, a screw portion 38 having a required length dimension in the longitudinal direction is provided on an outer peripheral surface of a required portion in the longitudinal direction of the raising / lowering drum rotation interlocking shaft 28 located in the limit switch box 26, and the screw portion 38. A striker 39 that is integrally provided with a sleeve 40 that is provided with a female screw (not shown) that is screwed with the screw is attached.

  An elevation upper limit detection micro switch 41 is provided as a switch for raising and lowering upper limit detection at a position near the right end portion of the screw portion 38, and a position near the left end of the screw portion 38 is used as a switch for elevation lower limit detection. In this configuration, a micro switch 42 for raising / lowering lower limit detection is provided. Thus, when the lifting / lowering drum rotation interlocking shaft 28 rotates due to the rotation of the lifting / lowering drum 12 in the winding direction, the striker 39 moves along the screw portion 38 in the right direction in the lifting / lowering drum 12. It slides with the movement amount according to the rotation amount of Therefore, when the rightward slide of the striker 39 is detected by the raising / lowering upper limit detection microswitch 41, the rotation in the winding direction of the raising / lowering drum 12 is stopped, so that the cargo handling minimum turning radius is obtained. The upper limit of the jib standing operation can be set.

  On the other hand, when the up-and-down drum rotation interlocking shaft 28 is rotated by the rotation of the up-and-down drum 12 in the unwinding direction, the striker 39 integrated with the sleeve 40 is moved leftward along the thread portion 38. The slider 12 slides with an amount of movement corresponding to the amount of rotation of the lifting drum 12. Therefore, when the slide of the striker 39 in the left direction is detected by the lifting / lowering lower limit detection micro switch 41, the rotation of the lifting / lowering drum 12 in the unwinding direction is stopped, so that the cargo handling maximum turning radius is obtained. The lower limit of the jib lodging action can be set. 43 is a micro switch for detecting the jib storage angle provided in the vicinity of the left end portion of the threaded portion 38. When the striker 39 is detected by the micro switch 43 for detecting the jib storage angle, It is possible to detect the angle and posture for lowering the tip of the jib 5 to a predetermined position on a deck (not shown) of the ship and retracting it further than the lower limit position during cargo handling defined by the detection microswitch 42. It is.

  On the outer peripheral surface of the required part in the longitudinal direction of the winding drum rotation interlocking shaft 29 located in the limit switch box 26, a threaded portion 44 is provided with a required length dimension in the longitudinal direction, and the threaded portion 44 is screwed. A striker 45 integrally provided with a sleeve 46 having a female screw (not shown) is attached.

  A winding upper limit detecting microswitch 47 is provided in the vicinity of the right end of the screw portion 44, and a winding lower limit detecting microswitch 48 is provided in the vicinity of the left end of the screw 44. Thus, when the winding drum rotation interlocking shaft 29 is rotated by rotation of the winding drum 16 in the winding direction, the striker 45 is moved along the screw portion 44 in the right direction in the winding drum 16. It slides with the movement amount according to the rotation amount of Therefore, when the rightward slide of the striker 45 is detected by the winding upper limit detection micro switch 47, the winding drum 16 is stopped from rotating in the winding direction, so that the hook by the winding drum 16 is stopped. The upper limit of the lifting operation of the hook 7 by the winding of the wire rope connected to 7 can be determined.

On the other hand, when the winding drum rotation interlocking shaft 29 is rotated by the rotation of the winding drum 16 in the unwinding direction, the striker 45 is moved leftward along the screw portion 44 of the winding drum 16. It slides with the amount of movement corresponding to the amount of rotation. Therefore, when the slide of the striker 45 in the left direction is detected by the winding lower limit detecting micro switch 47, the hook 7 is lowered by stopping the rotation of the winding drum 16 in the unwinding direction. The lower limit can be set.

  A differential switch 49 is provided on the striker 39 for detecting the raising / lowering motion of the jib 5 and detects the striker 45 for detecting the winding motion, and the differential switch 49 detects the striker 45. Sometimes, the upper limit of the lifting operation of the hook 7 can be changed according to the elevation angle of the jib 5 by stopping the rotation of the winding drum 16 in the winding direction.

  Reference numeral 50 denotes a wiring outlet for pulling out a wiring (not shown) connected to each switch 41, 42, 43, 47, 48, 49 in the limit switch box 26 to the outside while ensuring the waterproofness in the box. is there.

JP-A-61-86387

  However, the jib elevating monitoring device 22 for monitoring the elevating of the jib 5 in the conventional deck crane has a drum shaft of the elevating drum 12 protruding outward from one frame 11b supporting the elevating drum 12. Since the striker 23 is attached to the protruding end portion 13 and a jib emergency stop limit switch 24 is disposed in the vicinity thereof, the jib emergency stop limit switch 24 is provided in the machine room 3 of the deck crane (see FIG. 2). Is exposed to the environment. Therefore, the limit switch 24 for jib emergency stop is required to have water resistance (weather resistance), so that the limit switch 24 is increased in size and cost is actually increased. Furthermore, since the jib emergency stop limit switch 24 is disposed on the side of the one frame 11b, maintenance from the front side of the machine room 3 is difficult to perform.

  Therefore, the present invention eliminates the need for water resistance for the switch used to detect the jib raising / lowering operation, and can reduce the size of the switch and reduce the cost. It is intended to provide a crane jib elevation monitoring device.

  In order to solve the above problems, the present invention, corresponding to claim 1, is a limit switch box, a lifting drum rotation interlocking shaft that rotates in accordance with the rotation of the lifting crane of the deck crane, and the lifting drum. A striker that slides along a threaded portion provided at a required position in the longitudinal direction of the shaft by rotation of the rotation interlocking shaft, a switch for detecting an upper and lower limit for detecting the striker, and a switch for detecting an upper and lower limit, A striker that slides along the threaded portion at the required position of the lifting / lowering drum rotation interlocking shaft located in the limit switch box in the limit switch unit that can limit the upper and lower limits of the jib lifting operation of the deck crane. A striker different from that for the jib emergency stop is provided at a position corresponding to the rotation trajectory of the striker. And it provided comprising configuration Ji.

The deck crane jib elevation monitoring apparatus of the present invention exhibits the following excellent effects.
(1) A limit switch box, a lifting drum rotation interlocking shaft that rotates as the lifting crane of the deck crane rotates, and a screw provided at a required position in the longitudinal direction of the shaft by the rotation of the lifting drum rotation interlocking shaft A striker that slides along the section, a switch for detecting an upper and lower limit for detecting the striker, and a switch for detecting an upper and lower limit, so that the upper and lower limits of the jib elevating operation of the deck crane can be limited. A striker that is different from the striker that slides along the threaded portion is provided at a required position of the lifting / lowering drum rotation interlocking shaft located in the limit switch box in the limit switch unit, and a position corresponding to the rotation locus of the striker The jib emergency stop switch is provided in the Of the direction of rotation, can be detected by the switch for the jib emergency stop, you can monitor the lodging side and upright side of the operation of the jib.
(2) Since the jib emergency stop switch can be incorporated in the limit switch box of the limit switch unit, it is not necessary to obtain water resistance (weather resistance) for the jib emergency stop switch itself. Therefore, it is possible to reduce the size of the jib emergency stop switch and to reduce the cost.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIGS. 1 (a) and 1 (b) show an embodiment of a deck crane jib elevation monitoring apparatus according to the present invention. FIG. 5 (a) shows a deck crane having the same configuration as shown in FIGS. As in (b) and FIG. 6, the deck crane lifting drum 12 is rotated in the same direction via the chain wheel 32, the chain 33, and the sprocket wheel 31 on the drum shaft 13. In a configuration in which a limit switch unit 25 including a certain lifting / lowering drum rotation interlocking shaft 28 is provided, a required position (in FIG. 1 (a), the left end portion) located in the limit switch box 26 on the lifting / lowering drum rotation interlocking shaft 28. ) Is attached with a striker 51 projecting a required dimension in the radial direction. Further, when the striker 51 rotates integrally with the lifting / lowering drum rotation interlocking shaft 28, a micro jib emergency stop switch as a jib emergency stop switch is provided at a position corresponding to a circular path through which the tip of the striker 51 passes. The switch 52 is disposed and attached to a required location in the limit switch box 26 via the attachment member 53. Thus, each time the lifting drum rotation interlocking shaft 28 makes one rotation, the head portion 52a of the jib emergency stop micro switch 52 is hit by the striker 51 attached to the lifting drum rotation interlocking shaft 28. Thus, the jib elevation monitor 54 is configured.

  Other configurations are the same as those shown in FIGS. 2, 3 (A) and (B) and FIGS. 5 (A) and (B) and FIG. 6, and the same components are denoted by the same reference numerals.

  In the deck crane equipped with the above-described jib elevating monitoring device 54, when the elevating drum 12 of the elevating winch 6 is rotationally driven to the unwinding side, the jib 5 is lowered (FIG. 2, FIG. 2). 3), the lifting / lowering drum rotation interlocking shaft 28 of the limit switch unit 25 is rotated in the same direction, for example, the counterclockwise direction in FIG. When the raising / lowering drum rotation interlocking shaft 28 rotates in this way, the striker 51 attached to the raising / lowering drum rotation interlocking shaft 28 rotates integrally, so that the raising / lowering drum rotation interlocking shaft 28 rotates once. Every time, the head portion 52a of the jib emergency stop micro switch 52 is hit by the striker 51 on the downstream side in the rotation direction of the lifting / lowering drum rotation interlocking shaft 28, that is, in the left direction in FIG.

  On the other hand, when the raising / lowering drum 12 of the raising / lowering winch 6 in the deck crane is rotationally driven to the winding side to raise the jib 5 (see FIGS. 2 and 3), the raising / lowering drum 21 is rotated. The raising / lowering drum rotation interlocking shaft 28 of the limit switch unit 25 is rotated in the same direction, clockwise in FIG. When the raising / lowering drum rotation interlocking shaft 28 rotates in this manner, the striker 51 causes the head portion 52a of the jib emergency stop microswitch 52 to be moved each time the raising / lowering drum rotation interlocking shaft 28 rotates once. The drum is struck in the right direction in FIG. 1B, which is the downstream side in the rotational direction of the lifting / lowering drum rotation interlocking shaft.

  Therefore, based on the direction in which the head portion 52a of the jib emergency stop micro switch 52 is struck, the rotation direction of the lifting drum 12 rotating in the same direction as the lifting drum rotation interlocking shaft 28 is unwinding. Therefore, based on the detected rotation direction of the lifting drum 12, the jib 5 moves in the lying direction or the standing direction. You will be able to monitor.

  As described above, for example, the head 52a of the micro switch 52 for emergency stop of the jib is operated despite the fact that the driver operates the handle for raising the jib to the jib upright side in the driver's cab 4 (see FIG. 2). However, when the striker 51 on the lifting / lowering drum rotation interlocking shaft 28 is struck in the left direction in FIG. 1 (b), and more reliably struck twice, based on this, the jib raising / lowering operation is performed. Since the lowering operation of the jib 5 against the operation of the handle can be detected, it is possible to immediately stop the electric motor for driving the hydraulic pump (not shown) to make the jib 5 emergency stop.

  Thus, according to the deck crane jib elevation monitoring device 54 of the present invention, the jib emergency stop microswitch 54 used for monitoring the elevation motion of the jib 5 is originally intended to limit the cargo handling range of the deck crane. Can be incorporated into a limit switch box 26 having the water resistance (weather resistance) of the limit switch unit 25 provided in FIG. This eliminates the need for the water resistance (weather resistance) of the jib emergency stop microswitch 52, so that the jib emergency stop microswitch 52 can be reduced in size and cost can be reduced. become.

  Further, the wiring of the jib emergency stop micro switch 52 is connected to other switches 41, 42, 43, 47, 48, 49 provided in the limit switch box 26 for limiting the cargo handling range of the deck crane. Together with the wiring, the wiring work can be performed by pulling out from the wiring outlet 50 of the limit switch box 26. Therefore, it is not necessary to separately perform wiring work for the jib emergency stop micro switch 52, so that labor can be saved.

  Furthermore, since the jib emergency stop micro switch 52 is provided in the limit switch box 26 that can be opened on the front side, conventionally, the drum shaft 13 of the lifting drum 12 protruded outward from one frame 11a. As compared with the jib emergency stop limit switch 24 attached to one end of the main body, it is possible to improve maintainability.

  The present invention is not limited to the above-described embodiment, and the limit switch box 26 is provided with a limit drum box having a lifting / lowering drum rotation interlocking shaft 28 that rotates as the lifting / lowering drum 12 rotates. Of course, as long as the switch unit 25 is provided, it can be applied to any type of deck crane, and various modifications can be made without departing from the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of a deck crane jib elevation monitoring apparatus of the present invention, in which (a) is a schematic cut front view, and (b) is a view taken in the direction of arrows A-A in (a). It is a perspective view which shows the outline | summary of the conventional deck crane. It is the partially cut front view which expands and shows the winch for raising and lowering in the conventional deck crane. FIG. 5 is a view showing a conventional jib elevation monitoring device considered by the applicant of the present invention, and is an enlarged view taken in the direction of arrows BB in FIG. 3. The limit switch unit for limiting the cargo handling range of the deck crane which the present applicant thinks conventionally is shown, (A) is a schematic cutaway front view, (B) is a CC direction arrow view of (A). It is. FIG. 6 shows the limit switch unit of FIG. 5, and is a view taken in the direction of arrows DD in FIG. 3.

Explanation of symbols

12 Lifting Drum 25 Limit Switch Unit 26 Limit Switch Box 28 Lifting Drum Rotation Interlocking Shaft 38 Screw Portion 39 Striker 41 Lifting Upper Limit Detection Micro Switch (Switch for Lifting Upper Limit Detection)
42 Micro switch for detecting the lower limit of elevation (switch for detecting the lower limit of elevation)
51 striker 52 micro switch for jib emergency stop (switch for jib emergency stop)
54 Jib supine monitoring device

Claims (1)

  Along with the limit switch box, the lifting drum rotation interlocking shaft that rotates in accordance with the rotation of the lifting crane of the deck crane, and the screw portion provided at the required position in the longitudinal direction of the shaft by the rotation of the lifting drum rotation interlocking shaft A limit switch unit that includes a striker that slides and slides, a switch for detecting an upper and lower limit for detecting the striker, and a switch for detecting an upper and lower limit, and is capable of limiting the upper and lower limits of the jib hoisting operation of the deck crane. A striker different from the striker that slides along the threaded portion is provided at a required position of the lifting and rotating drum rotation interlocking shaft located in the limit switch box, and at a position corresponding to the rotation trajectory of the striker. Deck crane characterized by having an emergency stop switch Jib elevation monitoring device.

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