JP2008150201A - Turning beam collision prevention device of crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turning beam collision prevention device of a crane capable of surely preventing the end of a turning beam from being collided by a simple structure. <P>SOLUTION: This turning beam collision prevention device of a crane comprises a suspension base 20 installed on the end (12) upper surface of a turning beam, a surrounding frame member 30 disposed just above the end 12a, suspended from the suspension base 20 through a suspension rod 42, and swingable in any direction, and a spring rod limit switch 70 detecting the swing of the surrounding frame member 30. The surrounding frame member 30 is so formed as to surround the periphery of the end 12a in a horizontal plane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a crane provided with a turning beam, and more particularly to a turning beam collision preventing apparatus suitable for preventing a collision of a turning beam.

This type of crane has a swivel beam that can swivel in a horizontal plane, and the swivel beam is provided with a hoisting device having a hook or other hoisting tool, and the hoisting work can be performed using this hoisting device. (Patent Documents 1 and 2).
In addition, some cranes of this type have a swivel beam that can travel in the horizontal direction. In this case, the work area of the suspended load is greatly expanded.
Japanese Utility Model Publication No. 6-23988 JP 2004-161460 A

Since the crane of the type described above is installed in the building, when turning or traveling the turning beam, it is necessary to avoid the collision of the turning beam against the wall in the building, that is, the collision of its tip. Don't be.
In order to avoid the collision of the turning beam described above, it is conceivable that a proximity sensor composed of a photoelectric sensor or the like is disposed at the tip of the turning beam and the movement of the turning beam is stopped when the proximity sensor detects a wall.

However, since the swirling beam not only swivels in the horizontal plane but also travels in the horizontal direction, in order to cover all the movement of such a swirling beam, it is close to the front and both sides of the tip of the swirling beam. It is necessary to install a sensor.
In addition, when the wall layout in the building is complex and the swivel beam enters into a narrow path, the detection sensitivity of the proximity sensor varies even if the distance to the wall to be detected by the proximity sensor is constant. If this occurs, the tip of the swiveling beam will undesirably collide with the wall, and in order to avoid this, it takes a lot of effort to adjust the detection sensitivity of the proximity sensor.

  The present invention has been made based on the above circumstances, and an object of the present invention is to provide a turning beam collision preventing apparatus for a crane that can reliably prevent a turning beam from colliding with a simple configuration. .

  In order to achieve the above-mentioned object, the present invention includes a swivel beam capable of moving including turning along a horizontal plane and traveling in a horizontal direction, and a hoisting device provided on the swivel beam and performing a lifting work. In the crane, the turning beam collision preventing device of the present invention is provided at the tip of the turning beam in a state protruding from the tip of the turning beam in the direction of movement of the turning beam. And a single detector for detecting a change in the collision sensing member and outputting the detection signal.

According to the collision device of claim 1 described above, when the collision sensor collides against the peripheral member prior to the tip of the swirling beam during the movement of the swirling beam, the change of the collision sensing body accompanying the collision is single. , And a detection signal is output from this detector. Therefore, the output of such a detection signal is received, and the motion of the turning beam can be stopped.
Specifically, the collision detector is disposed at a position immediately above the tip of the swivel beam, and when viewed in a plan view, the surrounding frame member that surrounds the tip, and when the surrounding frame member collides with a peripheral member, the swivel beam In order to allow the displacement of the surrounding frame member with respect to the distal end portion thereof as the change, a supporting means for supporting the surrounding frame member on the distal end portion of the turning beam can be included.

Preferably, the support means has a suspension body that protrudes upward from the tip of the swivel beam and penetrates the surrounding frame member, and a plurality of suspension rods that suspendably swing the enclosure frame member from the suspension body. (Claim 3).
According to the second and third collision preventing devices, when the surrounding frame member collides with the peripheral member during the movement of the turning beam, the surrounding frame member swings through the suspension rod, and this swing is detected by the detector. Is done.

More preferably, the support means further includes a steady-state element that prevents a swing of the surrounding frame member other than a collision while allowing a swing caused by the collision (Claim 4). An elastically deformable rod member that connects the suspension body and the surrounding frame member. Specifically, a close coil spring can be used as such a rod member.
According to the collision preventing apparatus of claims 4 and 5, the steadying element prevents inadvertent swinging of the surrounding frame member during the movement of the turning beam.

On the other hand, a spring rod type limit switch can be used for the detector described above (Claim 6), and the limit switch in this case is preferably a normally closed type (Claim 7).
The spring rod type limit switch detects this swinging regardless of the direction of the surrounding frame member, and the limit switch swings even if the limit switch fails. A detection signal similar to that at the time is output.

Furthermore, the collision preventing apparatus according to the present invention further includes a collision detection cable that is provided on both sides of the turning beam and is stretched along the turning beam between the surrounding frame member and the proximal end side of the turning beam. (Claim 8).
If the collision sensing cable contacts the peripheral member during the movement of the swivel beam, the collision sensing cable flexes and pulls the surrounding frame member to operate the detector.

The crane turning beam collision prevention apparatus according to claims 1 to 5 has a simple configuration in which a change in the collision sensing body provided at the tip of the turning beam, that is, a displacement of the surrounding frame member is detected by a single detector. Thus, the collision of the turning beam can be surely prevented, and the malfunction of the detector can be prevented.
Since the collision prevention device according to claims 6 and 7 uses a spring rod type limit switch as a detector, even if the surrounding frame member swings in any direction, the swing can be reliably detected. In addition, because it is a normally closed type, it also exhibits a fail-safe function.

  Since the collision preventing apparatus according to the eighth aspect further includes the collision sensing cord-like body, it is possible to reliably prevent not only the front end portion of the turning beam but also collisions on both side surfaces thereof.

FIG.1 and FIG.2 shows the crane with which the turning beam collision prevention apparatus of one Example is applied, This crane is installed in a building.
The crane includes a pair of transverse rails 2 that extend in the horizontal direction in parallel with each other. As shown in FIG. 1, both ends of the traverse rail 2 are supported by left and right travel rails 4 via travel wheels 6, and these travel rails 4 extend horizontally in parallel to each other in a direction perpendicular to the traverse rail 2. . Therefore, the traversing rail 2 can reciprocate in the direction along the traveling rail 4 (the direction indicated by the arrow X in FIG. 2).

  The pair of traverse rails 2 are provided with trolleys 8, and the trolleys 8 can reciprocate in the direction along the traverse rails 2 (the direction of arrow Y in FIGS. 1 and 2). The trolley 8 has a hanging jib 10 extending below the transverse rail 42, and a swiveling beam 12 is attached to the lower end of the hanging jib 10. Therefore, the swivel beam 12 can also reciprocate, that is, travel in the direction along the transverse rail 2.

As is apparent from FIG. 1, the swivel beam 12 extends horizontally with its base portion supported by the hanging jib 10 and can swivel in a horizontal plane around its base end portion. A one-dot chain line A in FIG. 2 indicates the turning trajectory of the tip when the turning beam 12 is turned.
The turning beam 12 is also configured as a guide rail, and a pair of hoisting devices 14 are attached to the guide rail. Each hoisting device 14 has a hook 16 and can be reciprocated along a guide rail, that is, a turning beam 12.

FIG. 3 is an enlarged view of the distal end portion 12a of the turning beam 12, and the distal end portion 12a is provided with a collision preventing device 18 for the turning beam 12. In FIG. 3, reference numeral W ₁ denotes one of the walls in the building.
The details of the collision prevention apparatus 18 are shown in FIGS. 4 to 6. The collision prevention apparatus 18 will be described below with reference to these drawings.

  As shown in FIG. 4, the distal end portion 12 a of the swivel beam 12 is provided with a suspension base 20 having a rectangular shape as a suspension body on the upper surface, and the suspension base 20 extends from the upper surface of the distal end portion 12. It protrudes. Specifically, the suspension base 20 has legs 22 arranged at the four corners, and two of the legs 22 on the distal end side and the proximal end side of the swivel beam 12 are the upper ends thereof. The legs 22 that are separated from each other in the longitudinal direction of the swivel beam 12 are also coupled to each other via the stringers 26 at their upper ends. Further, the stringers 26 are connected to each other by a horizontal connecting plate 28 at the center thereof.

On the other hand, an enclosure frame member 30 as a collision sensing body is disposed horizontally immediately above the distal end portion 12 a, and the enclosure frame member 30 has an outer frame 32. The outer frame 32 is obtained by bending a bar material into a substantially trapezoidal shape as shown in FIG. 5, surrounds the suspension base 20, that is, its four legs 22, and the tip of the swivel beam 12. It protrudes forward and left and right from 12a.
Two inner frames 34 are arranged in the outer frame 32, and these inner frames 34 are made of bars extending in parallel with each other in the transverse direction of the turning beam 12, and the left and right sides of the outer frame 32. The parts 32 s are connected to each other to reinforce the outer frame 32. Needless to say, as is clear from FIG. 5, the inner frame 34 is arranged so as to avoid the legs 22 of the suspension base 2.

Four lower brackets 36 are attached to the outer frame 32, and two lower brackets 36 are provided in the width direction of the outer frame 32, two for each of the front side portion 32 f and the rear side portion 32 r of the outer frame 32. They are spaced apart from each other.
Each lower bracket 36 projects horizontally toward the inside of the outer frame 32, and has a pin hole at its tip, and the axis of this pin hole extends horizontally in the transverse direction of the swivel beam 12. Specifically, each lower bracket 36 has a bifurcated shape.

  On the other hand, as is clear from FIG. 4, upper brackets 40 corresponding to the lower brackets 38 are respectively provided on the upper part of the above-described suspension base 20, and these upper brackets 40 are arranged laterally before and after the suspension base 20. Two pieces are attached to the girder 24. Each upper bracket 40 protrudes horizontally toward the outer frame 32 and has a pin hole similar to the pin hole of the lower bracket 36 at its bifurcated tip.

  The lower and upper brackets 38 and 40 corresponding to each other are connected to each other via a suspension rod 42, and the suspension rod 42 suspends the surrounding frame member 30 with respect to the suspension base 20. Specifically, each suspension rod 42 has pin holes that match the pin holes of the upper and lower brackets 40 and 38 at the upper and lower ends thereof, and the horizontal pins 44 are inserted into the pin holes that are matched with each other, so that The side and upper brackets 38 and 40 are connected.

As shown in detail in FIG. 6, the suspension rod 42 has connection links 46 on the upper and lower sides thereof, and pin holes 48 for the horizontal pins 44 are formed in the connection links 46.
Relay links 52 are connected to the upper and lower links 46 via connection pins 50, and the upper and lower relay links 52 are U-shaped in opposite directions. Here, it should be noted that the axis of the connecting pin 50 is orthogonal to the pin hole 48, that is, the axis of the horizontal pin 44. Further, the upper and lower relay links 52 are connected to each other by a screw rod 54 and a nut 56, and the screw rod 54 has a left screw and a right screw at its upper end and lower end, respectively.

  If the surrounding frame member 30 is suspended from the suspension base 20 via the suspension rod 42 described above, the surrounding frame member 30 is centered on the horizontal pin 44 above the suspension rod 42 and the longitudinal direction of the swiveling beam 12 4, that is swingable in the direction of arrow B in FIG. 4, and about the connecting pin 50 on the upper side or the lower side of the suspension rod 42, the transverse direction of the swivel beam 12, that is, the arrow in FIG. 5. It can also swing in the direction of C.

  Furthermore, as shown in FIG. 4, the suspension base 20 further includes mounting plates 58 and 60 that are suspended from the front and rear edges of the connecting plate 28. A horizontal upper regulating plate 62 is attached to the mounting plate 58, and the upper regulating plate 62 is disposed below the connecting plate 28. Further, a horizontal lower regulating plate 64 is connected to one inner frame 34 of the surrounding frame member 30, and the lower regulating plate 64 is connected to the front portion 64 a located below the upper regulating plate 62 and the mounting plate 60. The rear portion 64b is located below, and the front and rear portions 64a and 64b are divided by the inner frame 34.

  Holes (not shown) are formed through the upper and lower regulating plates 62 and 64, and these holes are coaxially arranged. For example, a close coil spring 66 is inserted in the holes of the upper and lower regulating plates 62 and 64 as a steadying element. That is, the close coil spring 66 passes through the upper and lower regulating plates 62 and 64, and the upper end thereof is fixed to the lower surface of the connecting plate 28 via the spring seat 68.

The contact coil spring 66 described above is an elastic rod that prevents inadvertent swinging of the surrounding frame member 30, but instead of the contact coil spring 66, an elastically deformable rod such as rubber may be used.
Further, a normally closed limit switch 70 is attached to the attachment plate 60 as a detector. The limit switch 70 has a spring rod 72, which is suspended toward the lower restriction plate 64 and passes through the rear portion 64 b of the lower restriction plate 64. That is, a hole 73 (see FIG. 5) through which the spring rod 72 is inserted is formed in the rear portion 64b, and the rear portion 64b functions as a striker for the spring rod 72.

  According to the collision preventing apparatus 18 described above, the surrounding frame member 30 resists the contact coil spring 66 as described above, and the longitudinal direction (arrow B) of the swirling beam 12 and / or the transverse direction of the swirling beam 12 (arrow C). In any direction, the rear portion 64b of the lower regulating plate 64 serving as the striker operates the spring rod 72 of the limit switch 70 and causes the limit switch 70 to output an off signal.

Therefore, during the movement of the turning beam 12 such that the turning beam 12 travels along the traverse rail 2 described above or turns around the base end portion thereof, the distal end portion 12a of the turning beam 12 is built. too close to the wall (see reference numeral W ₁ in FIG. 3), enclosing frame member 30 described above in this wall, i.e., even if the collision at any position of the outer frame 32, enclosing frame member 30 It rocks reliably in the collision direction. As described above, this swing is reliably detected by the single limit switch 70, and the off signal output from the limit switch 70 is used as a stop signal for stopping the movement of the turning beam 12.

Therefore, when the surrounding frame member 30 collides with the wall, the motion of the swivel beam 12 can be stopped immediately, so that the tip 12a can be placed on the wall without directly colliding the tip 12a of the swirl beam 12 with the wall. The working area of the lifting work using the hoisting device 14 can be greatly expanded.
Further, since the limit switch 70 is a normally closed type, even if the limit switch 70 itself fails or the power supply circuit of the limit switch 70 is disconnected, a signal similar to the off signal from the limit switch 70 can be obtained. In such a situation, the movement of the swivel beam 12 can be disabled, and the fail-safe point is also excellent.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
The collision prevention apparatus 18 of FIG. 7 includes collision detection cords 74 such as wires on both sides of the turning beam 12, one end of each of the collision detection cords 74 is connected to the surrounding frame member 30, and The other end is connected to the tip of the overhanging rod 76. The projecting rod 76 projects laterally from the proximal end of the swivel beam 12. Therefore, the collision sensing cord 74 is stretched along the swivel beam 12 from the surrounding frame member 30 to the projecting rod 76. Further, the swivel beam 12 is provided with an overhanging rod 78 similar to the overhanging rod 76 on the side of the surrounding frame member 30, and the collision detection cord 74 passes through the overhanging rod 78 slidably. .

If provided with a collision detection wick member 74 described above, the turning of the turning of the beam 12, the collision sensing wick member 74 on one side impinges on the wall W ₂ as shown in FIG. 7, the collision sensing trabecular 74 flexes is pressed against the wall W _2, to swing the surrounding frame member 30. Even in such a swing, the single limit switch 70 detects the swing, and the motion of the swivel beam 12 is immediately stopped.
In addition, in the embodiment, the close contact coil spring 66 and the elastic rod are shown, but instead, the above-described suspension rod 42 incorporates a friction resistance element with respect to the swinging of the surrounding frame member 30, and the friction resistance element is shaken. It may be a stop element.

  Furthermore, although the collision preventing apparatus of the present invention uses the combination of the surrounding frame member 30 and the limit switch 70, the present invention is not limited to this, and the present invention changes the internal pressure due to the collision with the wall as a collision sensing body. This can also be realized by a combination of a go bag and a pressure sensor for detecting the pressure in the go bag, and various combinations can be considered for the collision detector and the detector.

It is the schematic side view which showed the crane with which the collision prevention apparatus of this invention is applied. It is a schematic plan view of the crane of FIG. It is the enlarged view which showed the front-end | tip of the turning beam of FIG. FIG. 4 is a cross-sectional view specifically illustrating the collision preventing apparatus of FIG. 3. It is the top view which showed the surrounding frame member of FIG. FIG. 3 is an enlarged view of the suspension rod of FIG. 3, (a) is a side view, and (b) is a front view. It is the schematic plan view which showed the collision prevention apparatus of the modification.

Explanation of symbols

12 Rotating beam 14 Hoisting device 16 Hook 20 Suspension stand (suspension body)
30 Go frame member (collision detector)
42 Hanging rod (support means)
66 Close contact coil spring
70 Limit switch (detector)
74 Collision sensing cable

Claims (8)

In a crane provided with a turning beam capable of movement including turning along a horizontal plane and traveling in a horizontal direction, and a hoisting device provided on the turning beam and performing a lifting work,
A collision detector provided at the tip of the swirl beam in a state protruding from the tip of the swirl beam in the direction of movement of the swirl beam, and showing a change associated with the collision when colliding with a peripheral member;
A crane turning beam collision preventing apparatus comprising: a single detector that detects the change of the collision sensing member and outputs a detection signal. The collision detector is:
An enclosure frame member disposed at a position immediately above the tip of the swirl beam, and surrounding the tip in a plan view;
And a supporting means for supporting the surrounding frame member on the distal end portion so as to allow the displacement of the surrounding frame member relative to the distal end portion as the change when the surrounding frame member collides with the peripheral member. The turning beam collision preventing apparatus for a crane according to claim 1. The support means is
A suspension that protrudes upward from the tip of the swivel beam and penetrates the surrounding frame member;
The swing beam collision preventing apparatus for a crane according to claim 2, further comprising a plurality of suspension rods that swingably swing the surrounding frame member from the suspension body.   4. The crane according to claim 3, wherein the supporting unit further includes a steadying element that prevents the surrounding frame member from swinging other than the collision while allowing the swinging due to the collision. 5. Swivel beam collision prevention device.   5. The swing beam collision preventing apparatus for a crane according to claim 4, wherein the steadying element is an elastically deformable rod member that connects the suspension body and the surrounding frame member. 6.   6. A crane turning beam collision preventing apparatus according to claim 1, wherein the detector is a spring rod type limit switch.   The crane turning beam collision preventing apparatus according to claim 6, wherein the limit switch is a normally closed type.   The apparatus further comprises a collision detection cable that is provided on each side of the swirl beam and extends between the surrounding frame member and a proximal end side of the swirl beam along the swirl beam. Item 8. The crane turning beam collision preventing device according to any one of Items 2 to 7.

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