JP2007055697A - Jib crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform lock release of a turning lock device to lock a beam 2 in a turning position by remote control operation. <P>SOLUTION: The lock device 17 is provided between a skirt part 8 hung from the beam 2 and a post 1, and an operation cable 25 comprising a release wire is connected with a lock pin of the lock device 17. The tip side of the operation cable 25 is guided to the beam tip side along the beam 2, and is locked on an operating panel 7 to operate a suspending device 4. Due to this structure, lock release operation can be performed in the position of the operating panel 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a jib crane constituted by a beam that is provided with a suspension device on a fixed post so as to pivot freely.

  A conventional jib crane is shown in FIGS.

  In both figures, reference numeral 1 denotes a cylindrical post. This post 1 is fixed to the installation surface, and a base end portion of a horizontal beam 2 as a suspension arm is attached to the upper end portion thereof via a bearing 3, whereby the beam is 2 protrudes around a vertical axis (center of the bearing 3) X so as to be rotatable.

  The suspension device 4 includes an electric winch 5 that moves horizontally along the beam 2 by a horizontal movement pull rope (not shown), and a suspension hook 6 is attached to a hoisting rope 5 a that is pulled out from the winch 5. .

  A hoisting drive unit (electric motor) (not shown) of the suspension device 4 is remotely operated by an operation panel 7 that is suspended from the suspension device 4 to a height that can be reached by an operator by a cable 7a.

  On the other hand, a skirt portion 8 having a U-shaped planar shape is provided vertically downward along the post 1 at the base end portion of the beam 2, and the beam 2 is locked at a specific turning position at the lower end portion of the skirt portion 8. A locking device 9 is provided.

  As shown in FIG. 7, the lock device 9 incorporates a lock pin 11 with a lock spring (coil spring) 10 and a guide member 12 in a skirt portion 8 on the swivel side, and on the outer periphery of the post 1 on the fixed side. A lock bracket 14 having a lock pin hole 13 is attached, and the lock pin 11 is fitted into the lock pin hole 13 by the spring force of the lock spring 10, so that the beam 2 is locked so as not to turn.

  In addition, an operation rope 15 is connected to the lock pin 11 and is suspended, and the lock pin 11 is pulled up by the pulling operation of the operation rope 15 to be unlocked. In FIG. 7, reference numeral 16 denotes a guide roller for guiding the operation rope 15 in a U-turn shape.

  There is no prior patent document related to the present invention for such a jib crane.

  However, the known jib crane has the following problems with respect to the turning lock function by the lock device 9.

  (i) Since the suspension work is performed by the suspension device 4, the operator holds the operation panel 7 in a position near the suspension hook 6, and performs the operation of lifting and lowering the load, the horizontal movement operation of the suspension device 4, and the turning operation of the beam 2. Do.

  In this case, since the locking device 9 is in the post 1 (skirt portion 8), it has to be moved to the post 1 to release the lock. For this reason, this unlocking operation is troublesome.

  (ii) In the known jib crane, since the lock pin hole 13 is provided only at one position from the idea that the beam 2 is locked in the retracted position when not working, the beam 2 can be locked only at a specific turning position. It has become. For this reason, when the installation surface is inclined, it is not possible to meet the demand for locking the beam 2 so that it does not move freely from the work position, which is not preferable in terms of safety and work efficiency.

  Therefore, the present invention provides a jib crane that can eliminate such problems related to the turning lock function.

  According to the first aspect of the present invention, a beam as a suspension arm is projected on a fixed post so as to be pivotable around a vertical axis, and a suspension device for lifting a load is provided on the beam. In a jib crane provided with an operation panel for operating the hoisting drive unit hanging from the suspension device and provided with a lock device that locks the beam so as not to turn, a lock pin is provided on the beam side as the lock device. On the other hand, a lock bracket having a lock pin hole through which the lock pin is inserted and removed is provided on the post side, and a tip operation portion of an operation cable for remotely operating the lock pin is positioned in the vicinity of the operation panel. .

  According to a second aspect of the present invention, in the configuration of the first aspect, a wire for mechanically operating a lock pin is used as an operation cable, and an operation knob is provided at the tip of the operation cable, and the other end is connected to the lock pin. It is.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the distal end portion of the operation cable is fixed to the operation panel.

  According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, a lock bracket is provided on the post side, and a plurality of lock pin holes into which the lock pins are selectively inserted and removed are provided in the lock bracket. It is provided at intervals in the direction.

  According to a fifth aspect of the present invention, in the jib crane in which a beam as a suspension arm protrudes on the upper part of a fixed post so as to be rotatable around a vertical axis, and a suspension device for lifting a load is provided on the beam. As a device, a lock pin is provided on the beam side, a lock bracket is provided on the post side, and a plurality of lock pin holes into which the lock pin is selectively inserted and removed are provided in the lock bracket at intervals in the post circumferential direction. It is provided.

  According to a sixth aspect of the present invention, in the configuration of the fourth or fifth aspect, the lock bracket is provided on the outer periphery of the post over the entire circumference, and the lock pin holes are provided at intervals on the entire circumference of the lock bracket. .

  A seventh aspect of the present invention is the configuration of the sixth aspect, wherein the lock bracket is configured by fitting a pair of half-divided divided pieces into the posts from the outer peripheral side and coupling them.

  The invention of claim 8 is the structure according to any one of claims 4 to 7, wherein each lock pin hole is formed as an elongated hole in the radial direction of the post.

  According to a ninth aspect of the present invention, in any one of the first to eighth aspects, a lock spring is provided for biasing the lock pin in a direction in which the lock pin is inserted into the lock pin hole.

  According to the first to fourth aspects of the present invention, since the tip of the operation cable for remotely operating the lock pin is positioned in the vicinity of the operation panel while taking a configuration in which the rotation is locked at the post portion, the operation of lifting and lowering the load is performed. The lock device can be remotely operated at the position (near the operation panel).

  Therefore, it is not necessary for the worker to bother to move to the post position and operate the locking device, so that the work efficiency can be improved.

  In particular, according to the invention of claim 3 in which the distal end portion of the operation cable is fixed to the operation panel, the operation cable is moved integrally with the operation panel, and the lock pin operation is always performed at the position of the operation panel (operation position during operation). Therefore, operability is good.

  According to the second aspect of the present invention, since the wire is used as the operation cable and the lock pin is mechanically remotely controlled by the operation knob provided at the tip thereof, the structure for operating the lock pin is simple and equipment. Cost is low.

  On the other hand, according to the inventions of claims 4 to 8, since the lock bracket holes on the post side are provided with a plurality of lock pin holes at intervals in the circumferential direction of the post, the beam is locked at a plurality of swiveling positions where the load is suspended. can do.

  For this reason, compared with the conventional jib crane which can be locked only at one specific turning position (storage position), it is possible to work safely and efficiently at the working position particularly when the installation surface of the crane is inclined.

  By the way, even if the lock device is configured to be remotely operated to eliminate the need for the operator to move to the lock device as in the first to fourth aspects of the invention, if there is only one lock pin hole, the lock pin and lock at the time of locking are locked. As a result, it becomes difficult to align the pin holes, and eventually the worker must go to the lock device.

  In this respect, according to the invention of claim 4 and the claim cited therein, since the plurality of lock pin holes are provided at intervals in the circumferential direction of the post, it is easy to align the lock pin and the pin hole at the time of locking. It becomes. Therefore, there is no need for the operator to move to the locking device.

  According to the invention of claim 6, since the lock bracket is provided on the entire outer periphery of the post and the lock pin holes are provided at intervals on the entire periphery of the lock bracket, the lock position is set to 360 degrees on the entire circumference. You can choose any of them.

  According to the seventh aspect of the present invention, the lock bracket is divided in half, and both divided pieces are fitted and joined to the post from the outer peripheral side, so that it is easy to incorporate the lock bracket into the post and replace the lock device.

  According to the eighth aspect of the present invention, each lock pin hole is formed as a long hole that is long in the radial direction of the post. Therefore, even if a positional deviation in the post radial direction occurs in each pin hole due to an error in manufacturing / assembly, reliable locking is achieved. The action can be secured.

  According to the invention of claim 9, since the lock pin is inserted into the lock pin hole by the spring force of the lock spring, an automatic lock function can be obtained. This is advantageous in that it can be automatically locked at the turning position.

  An embodiment of the present invention will be described with reference to FIGS.

  In the embodiment, the same parts as those of the conventional jib crane shown in FIGS. 6 and 7 are denoted by the same reference numerals, and redundant description thereof is omitted.

  A locking device 17 is provided between the lower end portion of the skirt portion 8 provided at the base end portion of the beam 2 and the post 1.

  Details of the locking device 17 are shown in FIGS.

  A side bracket 18 (see FIG. 2) is attached to one side surface of the lower end of the skirt 8, a lock pin 19 is attached to the side bracket 18, a cylindrical guide member 20 that guides the pin 19, and a downward direction to the pin 19 ( A lock spring 21 (compression coil spring) that applies a spring force in a direction to enter a lock pin hole described later is incorporated. In FIGS. 2 and 3, reference numeral 22 denotes a cover that also serves as a spring receiver for the lock spring 21 and covers the upper surface opening of the guide member 20.

  On the other hand, a lock bracket 23 is provided over the entire circumference at a position below the skirt portion 8 in the intermediate portion in the height direction of the post 1, and a number of lock pin holes 24 into which the lock pins 19 are inserted and removed. ... are provided at regular intervals over the entire circumference of the bracket.

  As shown in FIG. 4, the lock bracket 23 is configured by fitting a pair of split pieces 23a, 23b into the post 1 from the outer peripheral side and bolting them at opposite ends.

  By taking this halved configuration, it becomes easy to incorporate the lock bracket 23 into the post 1 and replace the lock device 17.

  Although the lock pin holes 24 may be round holes of a size into which the lock pins 19 are fitted, there may be a positional deviation in the post radial direction in the manufacturing and assembly stages. When this positional deviation in the radial direction of the post occurs, unlike in the case of positional deviation in the circumferential direction of the post, the position cannot be corrected at the time of the locking operation, so that there is a possibility of being unable to lock or incompletely locking.

  Therefore, in this embodiment, as shown in the drawing, each lock pin hole 24 is formed as a long hole that is long in the post radial direction so that the positional deviation in the post radial direction can be absorbed.

  One end of an operation cable 25 made of a release wire is connected to the upper end of the lock pin 19 to release the pin 19 from the lock pin hole 24 by remote control.

  The other end side of the operation cable 25 is raised along the skirt portion 8 as shown in FIG. 1 and then guided to the beam front end side along the beam 2 to hang down in parallel with the cable 7a of the operation panel 7, As shown in FIG. 5, the front end is fixed to the operation panel 7 (precisely, the lower end portion of the cable 7a) by a stopper 26.

  In FIG. 5, reference numeral 25 a denotes a wire as a main body of the operation cable 25, and the lock pin 19 is pulled up against the lock spring 21 by pulling the wire 25 a downward by the operation knob 25 b. As a result, the lock pin 19 is detached from the lock pin hole 24 and the turning lock of the beam 2 is released.

  When the pulling operation of the operation knob 25b is released at an arbitrary turning position, the lock pin 19 is lowered by the spring force of the lock spring 21 and is fitted into the lock pin hole 24 at that position, so that the beam 2 is in the turning lock state. Become.

  In FIG. 1, reference numerals 27... Denote cable hangers that suspend the operation cable 25 below the beam 2.

  In this configuration, when performing the suspension work, the operation knob 25b of the operation cable 25 is pulled, the lock pin 19 is pulled out from the lock pin hole 24, and the beam 2 is swung in a desired direction with the swiveling lock of the beam 2 released. Let

  The suspension device 4 is moved to the target position at this turning position, and the load is raised and lowered with the turning locked as necessary.

  This turning lock / unlock operation can be performed by the operator operating the knob with the operation panel 7 while holding the operation panel 7.

  That is, since it is not necessary to move to the post position and operate the lock device 17 when unlocking, the work efficiency can be improved.

  In this case, since the tip of the operation cable 25 is fixed to the operation panel 7, the operation cable 25 is moved together with the operation panel 7, and the lock pin operation is always performed at the position of the operation panel (operation position at the time of work). It can be carried out. For this reason, the operability is further improved.

  In addition, since the lock pin holes 24 are provided in the post-side lock bracket 23 at regular intervals over the entire circumference, the beam 2 can be locked at any turning position. That is, the lock position can be arbitrarily selected from 360 degrees around the circumference.

  For this reason, it is possible to work safely and efficiently at the work position, particularly when the installation surface of the crane is tilted, compared to the case where it can be locked only at one specific turning position (storage position) as in the past. it can.

  In addition, by providing a large number of lock pin holes 24 at regular intervals in the circumferential direction of the post, it is easy to align the lock pins 19 and the lock pin holes 24 during locking. Therefore, it is not necessary for the worker to move to the locking device even when locking.

Other embodiments
(1) In the above embodiment, the lock bracket 23 is provided on the entire circumference of the post and the lock pin holes 24 are provided on the entire circumference of the bracket at regular intervals. However, when the work range is limited, only the range is provided. A plurality of lock pin holes 24 may be provided.

  (2) In the above embodiment, the lock pin 19 is mechanically remotely controlled by the operation cable 25 made of a release wire. However, the lock pin 19 is configured by an electromagnet and electrically operated by the operation cable (electric cable). It may be configured to be remotely operated. In this case, the distal end operation portion of the operation cable serves as a switch for controlling the switching of the electromagnet.

  Alternatively, the lock pin 19 may be a hydraulic or pneumatic cylinder type, and a valve (for example, an electromagnetic valve) that supplies hydraulic pressure or pneumatic pressure may be remotely operated.

  When this hydraulic or pneumatic cylinder system is adopted, the direct operation object is a valve, and therefore an operation cable may be provided between this valve and a position near the operation panel.

  (3) In the above embodiment, only the case where the lock pin 19 is remotely operated is illustrated. However, in the invention of claim 5, this remote operation is not essential and is manually operated. A configuration may be taken.

1 is an overall side view of a jib crane according to an embodiment of the present invention. FIG. It is sectional drawing which expanded a part of FIG. 2 further. It is the IV-IV sectional view taken on the line of FIG. It is an enlarged view of FIG. It is a whole side view of the conventional jib crane. It is a partially expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Post 2 Beam 4 Lifting device 7 Operation panel 7a Cable of operation panel 8 Skirt part 17 Locking device 19 Lock pin 21 Lock spring 23 Lock bracket 24 Lock pin hole 25 Release wire type operation cable 25a Wire 25b of the same cable 26 Stopper for fastening the tip of the operation cable to the operation panel

Claims (9)

  A beam as a suspension arm is projected over the fixed post so as to be rotatable around the vertical axis, and a suspension device for lifting a load is provided on the beam, and the hoisting drive unit of the suspension device is operated. In a jib crane provided with an operation panel suspended from a suspension device and provided with a lock device that locks the beam so as not to turn, the lock device is provided with a lock pin on the beam side, while the post side has the above-mentioned A jib crane provided with a lock bracket having a lock pin hole through which a lock pin is inserted and removed, and a tip operation portion of an operation cable for remotely operating the lock pin being positioned in the vicinity of the operation panel.   The jib crane according to claim 1, wherein a wire for mechanically actuating the lock pin is used as an operation cable, and an operation knob is provided at the tip of the operation cable, and the other end is connected to the lock pin.   The jib crane according to claim 1 or 2, wherein a tip end portion of the operation cable is fixed to the operation panel.   The lock bracket is provided on the post side, and a plurality of lock pin holes into which the lock pins are selectively inserted and removed are provided in the lock bracket at intervals in the post circumferential direction. The jib crane of any one of Claims.   A beam as a suspension arm is projected on the fixed post so that it can swivel around the vertical axis, and a lifting device that lifts the load is locked on the beam side as a locking device in the jib crane provided on this beam. While a pin is provided, a lock bracket is provided on the post side, and a plurality of lock pin holes into which the lock pin is selectively inserted and removed are provided at intervals in the post circumferential direction. Jib crane.   6. The jib crane according to claim 4, wherein a lock bracket is provided on the outer periphery of the post over the entire circumference, and a lock pin hole is provided at an interval on the entire circumference of the lock bracket.   The jib crane according to claim 6, wherein the lock bracket is configured by fitting a pair of half-divided pieces into the post from the outer peripheral side and connecting them.   The jib crane according to any one of claims 4 to 7, wherein each lock pin hole is formed as a long hole that is long in a radial direction of the post.   The jib crane according to any one of claims 1 to 8, further comprising a lock spring that biases the lock pin in a direction in which the lock pin is inserted into the lock pin hole.

Images