JP2011157171A - Rope hoist - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rope hoist capable of preventing an accident of breaking down a rope guide or the like, even when a wire rope is lowered by the predetermined length or more by sliding of a brake, failure or a malfunction of an upper limit automatic stopping control device by a simple mechanismic means. <P>SOLUTION: In this rope hoist 1, a recessed part 412 without a spiral grove for idly rotating a slider part 91 of a rope guide mechanism 9 is arranged in a spiral groove 411 of a rope drum 4. When the slider part 91 idly rotates in a flat part of the rope drum 4, for preventing reengagement with the end side spiral groove 411, a retaining ring 81 is arranged on a guide shaft 8. The rope guide mechanism 9 is provided with a rope swelling preventive rib 94 for preventing a swelling of the wire rope W. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rope hoist, and in particular, includes a rope guide mechanism that guides a wire rope and moves to the left and right on the drum according to the rotation of the rope drum for aligned winding, and has a function of preventing the wire rope from being unwound. It is about a rope hoist.

Conventionally, there is a rope hoist used for unloading work.
For example, the rope hoist according to Patent Document 1 includes a rope guide that has a rope guide that is aligned and wound in a spiral groove formed in a winding drum, and has a sliding guide device that moves the rope guide to the left and right. That is, the random winding prevention means is configured to move left and right on the winding drum as the winding drum rotates.
For this reason, the rope guide is divided into a plurality of pieces in the radial direction in order to facilitate the attachment and removal of the rope guide, and when it is newly added to the existing one. The rope guide can be detachably connected to the winding drum so that the rope guide can be attached to and detached from the winding drum independently of the assembly and disassembly process of the hoist deceleration part and brake part. Installation and disassembly time are shortened.

Japanese Utility Model Publication No. 60-159791

However, according to the above configuration,
(1) When the rope drum exceeds the predetermined range and rotates in the winding (winding up) or unwinding (winding down) direction so as to wind or unwind the wire rope more than a predetermined length, both of the rope drums The parts arranged at the terminal portion, in particular, the pressing tool at the end of the wire rope fixed to the rope drum and the rope guide mechanism may interfere with each other, resulting in damage.
(2) If the wire rope is only pressed against the rope drum with only the guide roller, the wire rope cannot be prevented from bulging and may be wound in a turbulent manner.
The present invention has been proposed in order to improve the above-described problems. The rope drum exceeds a predetermined rotation amount due to slipping of the brake, failure of the rope drum automatic stop control device, or erroneous operation. It is an object of the present invention to provide a rope hoist that can prevent a rope guide or the like from being damaged even if it is damaged.

  In order to solve the above-mentioned problem, in the invention according to claim 1, a rope hoist comprising a rope drum having a spiral groove for winding the wire rope, and the wire rope is roped by the rotation of the rope drum. In a configuration in which the hook portion is wound up and down by rewinding and rewinding to the spiral groove of the drum, the guide shaft provided in parallel to the rope drum is slid in the spiral groove in conjunction with the rotation of the rope drum and reciprocated. A rope guide mechanism having a slider portion that can be inserted and a rope pressing portion that presses the wire rope against the rope drum. The slider portion of the rope guide mechanism is idled at the end of the spiral groove of the rope drum. And a recess having no spiral groove for stopping the movement of the rope guide mechanism.

  As a result, when the rope drum rotates in the rewinding direction beyond the predetermined range due to the rope drum stroking, the slider portion that is screwed with the spiral groove of the rope drum is moved to the end of the spiral groove of the rope drum. It was introduced into the recess without the spiral groove, and the rope guide mechanism was idled so that the rope guide mechanism was not moved further to the end holding side of the wire rope. Further, it is possible to prevent damage to the rope guide mechanism and the like.

  The invention according to claim 2 is characterized in that the spiral groove-less concave portion of the rope drum is provided on the start end side and the end end side of the spiral groove of the rope drum.

  As a result, when the rope drum rotates in the rewinding direction beyond the predetermined range due to the rope drum stroking, the slider portion that is screwed with the spiral groove of the rope drum is moved to the end of the spiral groove of the rope drum. It was introduced into the recess without the spiral groove, and the rope guide mechanism was idled so that the rope guide mechanism was not moved further to the end holding side of the wire rope. While it is possible to prevent damage to the rope guide mechanism, etc., the rope guide mechanism can be moved to the limit position without winding the wire rope around the spiral groove of the rope drum and without operating the automatic stop control device. Even during the test operation to be performed, there are recesses without spiral grooves on the start and end sides of the spiral groove of the rope drum. The movement of the pressing side is stopped, it is possible to prevent breakage of such a rope guide mechanism in advance.

  According to a third aspect of the present invention, there is provided a stopper for preventing the movement of the rope guide mechanism by bringing the slider portion of the rope guide mechanism into contact with the guide shaft provided in parallel with the rope drum corresponding to the concave portion without the spiral groove. It is characterized by providing a ring.

  As a result, even if the rope drum continues to run, it is possible to prevent the slider portion from being screwed again into the spiral groove closer to the terminal than the idling position, thereby reliably preventing the movement of the rope guide mechanism.

  In the invention according to claim 4, the rope pressing portion of the rope guide is provided with a rope pressing roller, and the rope pressing roller is attached so as to press the wire rope against the rope drum at the tip of the arm portion extended to the slider portion. It is characterized by being energized.

  As a result, the rope pressing roller in the rope pressing part is pressed against the rope drum by the urging force of the wire rope, so that even when the wire rope is not tensioned, the wire rope is prevented from bulging to prevent turbulent winding. can do.

  The invention according to claim 5 is characterized in that the arm portion of the rope guide mechanism is provided with rope bulge preventing means for preventing the wire rope from bulging.

  Thereby, even when no tension is applied to the wire rope, it is possible to prevent the wire rope from bulging and to prevent irregular winding.

  According to the present invention, even when the rope drum rotates beyond the predetermined rotation range in the winding and rewinding rotation direction due to slipping of the brake, control delay of the automatic stop control device of the rope drum, failure, or erroneous operation, It is possible to prevent damage to the rope guide and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external side view showing a partially broken rope hoist according to an embodiment of the present invention. It is half section side surface explanatory drawing which showed the state which wound the wire rope around the rope drum in the rope hoist shown in FIG. It is whole longitudinal cross-section explanatory drawing along the longitudinal axis direction of the rope drum in the rope hoist shown in FIG. It is a cross-sectional explanatory drawing of the rope guide mechanism in the rope hoist shown in FIG. FIG. 4b is an exploded view of the rope guide mechanism shown in FIG. 4a. It is a cutting arrow line view which follows the AA line of the rope guide mechanism shown to FIG. 4a. In the rope hoist shown in FIG. 1, it is a principal part longitudinal cross-section explanatory drawing which showed the state in which the rope guide in a rope drum exists in a normal position. In the rope hoist shown in FIG. 1, it is principal part longitudinal cross-section explanatory drawing which showed the state in which the rope guide in a rope drum exists in an idling position. In the rope hoist shown in FIG. 1, it is a principal part longitudinal cross-section explanatory drawing which showed the state in which the rope guide in a rope drum reached the slide limit position.

(First embodiment)
FIG. 1 shows a first embodiment of a rope hoist 1 according to the present invention.
The rope hoist 1 includes a rope drum 4 that is rotatably supported by flange portions 21a and 21b opposed to the longitudinal direction of the drum frame 2 via bearing portions 3 at both longitudinal ends, and winds a wire rope W. ing. An electric motor unit 6 having an electromagnetic brake 6 a is movably connected to a hollow shaft (described later) supported by the bearing unit 3 on the flange 21 b side of the rope drum 4 via a reduction gear unit 5. In this configuration, the electric motor unit 6 is activated and the rope drum 4 is rotated at a reduced speed via the speed reducer unit 5. On the flange portion 21a side of the drum frame 2, a control device 7 is mounted that controls the rotation of the rope drum 4 by supplying power to the motor portion 6 and using an operation push button switch, a detector, and the like (not shown). ing.
Further, the flange portions 21 a and 21 b facing the longitudinal direction of the drum frame 2 are provided near the lower portion of the rope drum 4 supported between the flange portions 21 a and 21 b and provided with a guide shaft 8 in parallel with the rope drum 4. It has been.
A rope guide mechanism 9 is arranged on the guide shaft 8 so as to be able to reciprocate in conjunction with the movement of the hanging position of the wire rope via a slider portion (described later). The wire rope W is wound around the rope drum 4, the wire rope W is rewound from the rope drum 4, and the hook portion 10 is raised and lowered.

As shown in FIGS. 2 and 3, the rope drum 4 is fixed to a cylindrical pipe member 41 having a predetermined diameter by fitting first and second end side plates 42a and 42b to both ends of the opening. The first and second end side plates 42a and 42b are provided with hollow shaft portions 43a and 43b centered on the central axis. The hollow shaft portions 43a and 43b are supported by the flange portions 21a and 21b of the drum frame 2 through the bearing portion 3 on the outer peripheral portions protruding outward of the first and second end side plates 42a and 42b. I have to.
A spline groove is provided on the inner peripheral surface of the hollow shaft portion 43b of the second end side plate 42b to insert and connect the output shaft (not shown) of the speed reducer portion 5.

A spiral groove 411 is formed on the outer peripheral surface of the cylindrical pipe member 41 of the rope drum 4 as described above so that the wire rope W can be aligned and wound in a single layer.
The spiral groove 411 is formed in a concave groove shape having a radius of curvature corresponding to the outer diameter of the wire rope W.
In addition, the spiral groove 411 is formed at a position closer to the center at a predetermined interval from both ends of the outer peripheral surface of the cylindrical tube member 41, and serves as a start end of the spiral groove 411 at a position closer to the second end side plate 42b. As a terminal portion of the spiral groove 411 closer to the first end side plate 42a, a spiral groove-less recess 412b is formed in a predetermined range.

The recess 412 without a spiral groove is formed to have a bottom diameter that is substantially the same as the groove bottom diameter of the spiral groove 411 and has a width that is equal to or more than twice the width of the spiral groove 411. Alternatively, the concave portion 412a without the spiral groove may be formed by scraping a crest between adjacent grooves of the spiral groove 411 to approximately the same depth as the depth of the spiral groove 411 for about one turn.
Then, the sliding projection 91a of the slider 91 in the rope guide mechanism 9 described later smoothly slides from the spiral groove 411 to the spiral groove-less recess 412a and is introduced into the spiral groove-less recess 412a, and the spiral groove-less recess 412a. Thus, the sliding projection 91a is idled.

  The spiral groove-less recess 412b as the start end of the spiral groove 411 closer to the second end side plate 42b is used for checking the operation of the rope guide mechanism during the test operation, as will be described later. That is, the rope guide mechanism is idled so as not to move further toward the second end side plate 42b during the test operation to prevent the rope guide mechanism from being damaged. The outer peripheral surface of the cylindrical tube member 41 near the second end side plate 42b from the concave portion 412b without the spiral groove is not grooved.

On the other hand, the spiral groove-less portion 412a as the terminal portion of the spiral groove 411 closer to the first end side plate 42a is used for the rope guide mechanism 9 during the trial operation to stop sliding at the terminal portion, When the rope drum is rotated too much in the direction of lowering when the hook portion 10 is being lowered while the wire rope W is wound around the spiral groove 411 (when the wire rope W is unwound too much) In addition, the rope guide mechanism can be stopped from moving beyond a predetermined range to prevent breakage.
Further, an extra winding spiral groove 413 for winding the wire rope W excessively is formed on the outer peripheral surface of the cylindrical tube member 41 near the first end side plate 42a from the spiral groove-less portion 412a.
After the spiral spiral groove 413 is continuously formed in the cylindrical tube member 41 at the same pitch as the spiral groove 411, the spiral groove-less recess 412a is formed at the boundary portion of the spiral groove portion to be the spiral groove 411 and the spiral spiral groove 413. Further, when turning and forming in the same manner as the above-described spiral groove-less recess 412b, the processing is easy and the wire rope W can be satisfactorily extended from the extra spiral groove 413 to the spiral groove 411 through the spiral groove-less recess 412a. Can be aligned and wound.
Furthermore, a bolt hole 415 of a terminal presser 414 for fixing the terminal portion of the wire rope W is provided in the cylindrical tube member 41 immediately adjacent to the first end side plate 42a.
As shown in FIGS. 2 and 5 a, the end of the wire rope W is fixed to the rope drum 4 by the terminal presser 414 and aligned from the spiral spiral groove 413 to the spiral groove 411 through the spiral grooveless recess 412 a. Wrapped.

Next, the rope guide mechanism 9 will be described.
As shown in FIG. 4a, the rope guide mechanism 9 includes a slider portion 91 that is reciprocally inserted along the guide shaft 8, an arm portion 92 that extends integrally with the slider portion 91 in an arc shape, and an arm The rope holding portion 93 is pivotally fixed to the tip of the portion 92 so as to be swingable.

  The slider portion 91 has a sliding convex portion 91 a that can be traced in a sliding state along the spiral groove 411 on the outer peripheral surface of the cylindrical tube member 41 of the rope drum 4.

  The arm portion 92 has a pair of arm members 92a and 92b that are curved from the slider portion 91 with a radius of curvature corresponding to the outer periphery of the wire rope W wound around the spiral groove 411 of the rope drum 4 (see FIG. 4b). The arm members 92a and 92b have a space slightly larger than the outer diameter of the wire rope W between them, and are connected so as to maintain the space on the upper end side of the arm members 92a and 92b. A pipe Sp is interposed, and the rope pressing portion 93 is fixed by a support shaft 92c inserted through the spacer pipe Sp. The rope pressing portion 93 includes a pressing arm portion 93a and a roller member 93b. The roller member 93b of the rope pressing portion 93 is always brought into pressure contact with the outer periphery of the wire rope W wound around the spiral groove 411 of the rope drum 4 by the biasing force of the spring member Cs.

  At the same time, a sliding convex portion extending from the guide shaft 8 insertion portion of the slider portion 91 to the opposite side of the rope pressing portion 93 via the arm portion 92 due to the reaction force of the rope pressing portion 93 generated by the urging force of the spring member Cs. Since 91a is brought into pressure contact with the spiral groove 411, the sliding protrusion 91a reliably traces along the spiral groove 411 in a sliding state, and the rope guide mechanism 9 slides in conjunction with the rotation of the rope drum.

A portion of the wire rope W wound around the spiral groove 411 of the rope drum 4 hangs down from the rope drum 4 toward the hook portion 10, and the winding start portion that moves according to the winding amount is a rope in the rope guide mechanism 9. The roller member 93b of the pressing portion 93 presses and urges the spiral groove 411 of the rope drum 4 and passes the wire rope W hanging from the winding start portion toward the hook portion between the arm members 92a and 92b. The hook part 10 is suspended.
At this time, the sliding protrusion 91a of the rope guide mechanism 9 slides in a spiral groove in which the wire rope W next to the spiral groove 411 around which the wire rope W is wound is not wound around the winding start. Engaged. For this reason, since the rope guide mechanism 9 moves in conjunction with the movement of the winding start portion of the wire rope W in conjunction with the rotation of the rope drum 4 that winds and rewinds the wire rope W, the wire rope W is moved to the arm member 92a. , 92b is guided to the spiral groove 411, and is further pressed and urged by the roller member 93b to the spiral groove 411, and is surely wound in the spiral groove 411.

  Of the arm members 92a and 92b constituting the arm portion 92, one arm member 92a, that is, the arm member 92a on which the slider portion 91 advances when the wire rope W is rewound (unwound). Is provided with a rope bulge prevention rib 94 for suppressing the wire rope W from bulging due to elasticity (see FIG. 4c).

Further, the guide shaft 8 is provided with a retaining ring 81 for preventing the slider portion 91 in the rope guide mechanism 9 described above from further moving on the guide shaft 8 to the end of the rope drum 4. .
In this case, the position of the retaining ring 81 reaches the spiral groove-less recess 412 formed as the terminal end of the spiral groove 411 on the side close to the first end side plate 42a by the sliding projection 91a of the slider 91 (FIG. 5b). Further, the slider 91 is set so as to contact the retaining ring 81 even when the rope drum 4 rotates in the rewinding direction (the state shown in FIG. 5c).

  The hook portion 10 uses a well-known configuration using a moving pulley (not shown), and a rope rope 4 is formed by hanging a wire rope W having a start end portion fixed to the drum frame 2 on the moving pulley. The wire drum W is wound up and unwound to raise and lower the hanging hook 10F by starting the electric motor unit 6 and rotating the rope drum 4 at a reduced speed via the speed reducer unit 5.

The rope hoist 1 according to the present invention is configured as described above. Next, the operation of the rope hoist 1 will be described.
In this rope hoist 1, when performing the work of winding and unloading the load, first, the wire rope W is unwound, the hanging hook 10F is lowered, the luggage is hung on the hanging hook 10F, and the hoisting and lowering work is performed. I do. For this purpose, an operation button (not shown) provided in the control device 7 is operated to supply power to the motor unit 6, the motor unit 6 is activated, and the rope drum 4 is rotated at a reduced speed via the speed reducer unit 5.

  The wire rope W wound around the spiral groove 411 in the cylindrical tube member 41 of the rope drum 4 passes between the arm members 92a and 92b through the roller member 93b of the rope pressing portion 93 in the rope guide mechanism 9, and is wound. Returned (rolled down)

As described above, when the hanging hook 10F reaches the floor surface or hits an obstacle such as a load while the wire rope W is being wound down, the tension applied to the wire rope W is rapidly reduced. As a result, the wire rope W is slackened, and is lifted from the spiral groove 411 in the cylindrical tube member 41 of the rope drum 4 due to the elastic force, and becomes inflated.
However, the wire rope W is restrained by the roller member 93b of the rope pressing portion 93 in the rope guide mechanism 9 while the portion passing between the arm members 92a and 92b is loosened and swells, and the slider portion 91 further advances. The rope bulge prevention rib 94 provided on the arm member 92a on the side to be effectively prevented from bulging the wire rope W due to elasticity.

  Further, when the suspension hook is wound down to a predetermined range limit, the rope drum 4 rotates elliptically due to slipping of the electromagnetic brake, other control delays, etc., even if the power supply to the motor unit 6 by the control device 7 is cut off. However, when the sliding convex portion 91a of the rope guide mechanism reaches the concave portion 412 without the spiral groove, the sliding convex portion 91a idles within the concave portion 412 without the spiral groove and does not move further toward the terminal portion fixing position of the wire rope W. Further, even when the arm member 92a of the arm portion 92 is pulled toward the lobe terminal presser 414 by the wire rope W that has been unwound by extending the elliptical distance, the movement is caused by the retaining ring 9 fitted to the guide shaft 8. This prevents the sliding convex portion 91a from engaging with the surplus spiral groove 413, thereby reliably preventing damage to the apparatus.

As described above, the rope guide mechanism 9 can be connected to the wire rope W by simple mechanical means such as the spiral groove-free recess 412 as the terminal end of the spiral groove 411 and the retaining ring 81 provided on the guide shaft 8. Therefore, even if a control delay or a brake slip occurs, the rope guide mechanism 9 can be moved by the wire rope W. Therefore, the effective winding length is limited or the entire length of the rope drum 4 is increased by the amount of the margin. It needs to be long. However, according to the said structure, this margin can be abbreviate | omitted and the full length of the rope drum 4 can be shortened. Further, the method of stopping by the control device 7 requires a double and triple safety device in consideration of a failure of the control device, and is complicated and expensive.
In particular, the rope guide mechanism 9 is provided with a rope bulge prevention rib extending in the direction of the terminal end fixing position of the wire rope W, and the end of the wire rope W is positioned at the terminal end fixing position of the wire rope W on the outer periphery of the rope drum. Since the presser 414 is fixed, it is effective to provide a recess 412a without a spiral groove on the end side of the spiral groove 411 of the rope drum in order to prevent interference between the rope guide mechanism 9 and the terminal presser 414. It is.

  By the way, when the test operation is performed after the manufacture of the rope hoist 1 as described above, for example, an operation test of the rope guide mechanism 9 is performed as an operation check item, but a wire is placed in the spiral groove 411 in the cylindrical tube member 41 of the rope drum 4. In a state where the rope W is not wound, the sliding projection 91a of the slider portion 91 of the rope guide mechanism 9 is slidably brought into contact with the spiral groove 411, and power is supplied to the motor portion 6 without using the control device 7. Then, the motor unit 6 is activated, and the rope drum 4 is rotated at a reduced speed via the speed reducer unit 5 to check the operation of the rope guide mechanism 9.

  Then, the rope guide mechanism 9 includes a spiral groove-less recess 412a as a terminal portion of the spiral groove 411 closer to the first end side plate 42a and a spiral groove as a start end portion of the spiral groove 411 closer to the second end side plate 42b. Within the range of the non-recessed portion 412b, the spiral groove 411 is used as a guide means to reciprocate on the guide shaft 8 depending on the rotation direction of the rope drum 4.

  Accordingly, even in such a test operation, the rope guide mechanism 9 moves to the first and second end side plates 42a and 42b at both ends of the rope drum 4 or slides beyond the screwing range of the spiral groove 411. The convex portion 91a does not ride on the cylindrical tube member 41 and is not damaged, can contribute to the performance of a useful test operation, simplifies and ensures the test operation procedure, and improves the efficiency of inspection and repair. Can be achieved.

DESCRIPTION OF SYMBOLS 1 Rope hoist 2 Drum frame 21a, 21b Flange part 3 Bearing part 4 Rope drum 41 Cylindrical tube member 411 Spiral groove 412a, 412b Spiral groove-less recessed part 413 Unwinding spiral groove 414 Terminal presser 415 Bolt hole 42a 1st end side plate 42b Second end side plate 43a, 43b Hollow shaft portion 5 Reduction gear portion 6 Electric motor portion 7 Controller 8 Guide shaft 81 Retaining ring 9 Rope guide mechanism 91 Slider portion 91a Sliding convex portion 92 Arm portion 92a, 92b Arm member 92c Support shaft 93 Rope holding part 93a Holding arm part 93b Roller member 94 Rope bulge prevention rib 10 Hook part 10F Hanging hook W Wire rope Sp Spacer pipe Cs Spring member

Claims (5)

A rope hoist,
In a configuration comprising a rope drum having a spiral groove for winding a wire rope, and lifting and lowering the hook portion by winding and rewinding the wire rope to and from the spiral groove of the rope drum by rotation of the rope drum ,
A slider portion that is inserted into a guide shaft provided in parallel with the rope drum so as to reciprocate by sliding in the spiral groove in conjunction with the rotation of the rope drum, and the wire rope to the rope drum. A rope guide mechanism having a rope pressing portion that is in pressure contact;
A rope hoist having a spiral groove-less recess for stopping the movement of the rope guide mechanism by idling the slider portion of the rope guide mechanism on the terminal side of the spiral groove of the rope drum.   The rope hoist according to claim 1, wherein the concave portion without the spiral groove of the rope drum is provided on a start end side and a terminal end side of the spiral groove of the rope drum.   The guide shaft provided in parallel to the rope drum is provided with a retaining ring for preventing the movement of the rope guide mechanism by bringing the slider portion of the rope guide mechanism into contact with the concave portion without the spiral groove. The rope hoist according to claim 1.   The rope pressing portion of the rope guide is provided with a rope pressing roller, and the rope pressing roller is urged to press the wire rope against the rope drum against the tip of an arm portion extending to the slider portion. The rope hoist according to any one of claims 1 to 3.   The rope hoist according to claim 4, wherein the arm portion of the rope guide mechanism is provided with rope bulge preventing means for preventing the wire rope from bulging.

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