JP2009051634A - Falling preventive mechanism and hoisting device using this mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a falling preventive mechanism for surely operating its falling preventive mechanism, without making a hoisting object fall even if a towing member ruptures, when suspending and supporting a suspending member for joining the hoising object by the towing member. <P>SOLUTION: A falling motion regulating means 33 for checking or braking its falling, is arranged in the suspension member 10 for joining the hoising object W. This suspending member 10 is suspended and supported by the towing members 15a and 15b such as two chain ropes. A joint member 40 for joining the suspension member 10 and the towing member 15 is journaled by the suspension member so as to rock when one of the two towing members is ruptured (or relaxed). Then, the joint member 40 and the falling motion regulating means 33 are connected by an interlocking means so as to start the falling motion regulating means 33 by interlocking with rocking motion and falling motion of the joint member 40. Thus, when an excessive load reaches the suspension member 10, one of the towing members ruptures, and even if the other is normally towed, the regulating means 33 is started. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hoisting device for hanging and supporting a heavy load such as a crane and a fall prevention mechanism thereof, and relates to an improvement of a safety mechanism for preventing a dropping accident of a hanging member for supporting a heavy load.

  In general, this type of hoisting device is widely known as a lifting device that lifts and lowers a heavy object up and down freely when the heavy object is suspended and supported from the ceiling of various cranes or buildings, for example. Yes. Such a hoisting device fixes and lifts a lifted object to a frame frame (such as a lifting balance) of an appropriate shape, hangs the frame frame, and connects the frame frame to a lower end portion of a pulling member such as a chain or a rope. The part is connected to a hoisting device. The hoisting device is provided with a load sheave on a motor or manually rotating drive rotating shaft, and a pulling member such as a chain and a rope is wound around the load sheave, and the suspension member such as a lifting balance is moved up and down by the rotation of the driving rotating shaft. is doing.

  Such a hoisting device is disclosed, for example, in Patent Document 1 as an overhead crane structure. In this document, a trolley is mounted on a traveling rail attached to the ceiling of a building, and a hoisting device is mounted on the trolley. In the hoisting device, a chain for hanging and supporting the lifted object is fitted to the load sheave, and the lifted object is moved up and down by rotating the load sheave. Therefore, when the lifted material is suspended and supported by a pulling member such as a chain wound around the hoisting machine, the lifted material is directly supported by the hook provided on the pulling member, and the lifted material is suspended from the pulling member. A case is known in which a lift (supporting member) is supported and a lifted material is suspended and supported indirectly.

  For example, Patent Document 2 discloses a lifting mechanism that suspends and supports a lifting object on a lifting balance. In this document, a device is disclosed in which a suspension balance is suspended and supported on a chain connected to a hoisting device, and a lifting object is fixed to the suspension balance.

Therefore, when the lifted object is particularly heavy, a pulling member such as a chain may be broken and the lifted object may fall. In this case, a safety mechanism for preventing the lifted object from falling is necessary. For this safety mechanism, for example, it has already been proposed to provide a guide rail in the up-and-down direction of the suspension balance, and to provide a fall prevention mechanism such as a lock mechanism for preventing the fall between the guide rail and the suspension balance. These fall prevention mechanisms are configured such that the lock mechanism is maintained in an inoperative state when the suspension balance is being pulled normally, and the lock mechanism is activated when an abnormality such as breakage occurs in the pulling member of the suspension balance. Yes.
Japanese Patent Laid-Open No. 06-286975 (FIG. 1) JP 2002-255472 A (FIG. 1)

  As described above, when a pulling member that suspends and supports a suspension member such as a lifting balance that fixes a lifted object breaks or relaxes, a fall prevention mechanism such as a lock mechanism or a brake mechanism that prevents the suspension member from falling is activated. It is known to do. Conventionally, this fall prevention mechanism slidably fits a suspension member on a guide rail arranged in the vertical direction, and a detachable lock mechanism (such as a cotter) is disposed between the guide rail and the suspension member. The lock mechanism is configured to operate when the traction member is broken. It is also known that when a lift is heavy, the suspension member is suspended and supported by a plurality of traction members such as two suspension members.

  However, conventionally, when the suspension member is pulled by two pulling members, the above-described fall prevention mechanism is activated when both the pulling members are broken and the suspension member falls. For this reason, in the traction structure in which the suspending member is supported by the two traction members, even if one traction member is broken or loosened, the fall prevention mechanism does not operate and the traction state is continued.

  If the traction state is continued in a state where one of the two traction members is broken in this way, an excessive load may be applied to the remaining one and the traction member may be broken destructively when an external force such as an impact acts on the remaining one. . When the pulling member breaks destructively in this way, the broken piece may fall and cause danger to the operator, and at the same time, an impact may be applied to a locking mechanism such as a cotter, and normal operation may not be obtained.

  Therefore, the present inventor suspends and supports the suspension member provided with the fall prevention mechanism with two pulling members, and in this case, the fall prevention mechanism operates when one pulling member breaks. It came to the idea that the above-mentioned problem could be solved.

  According to the present invention, when the suspension member that joins the lifted object is supported by being suspended by the pulling member, the lifted object does not fall even if the pulling member breaks, and the fall prevention mechanism is reliably operated. An object of the present invention is to provide a fall prevention mechanism in the winding device.

  In order to achieve the above object, according to the present invention, a suspension member for connecting a lifted object is provided with a drop motion restricting means for preventing or braking the fall, and the suspension member is provided with first, second, two chains, a rope, and the like. Suspended and supported by the pulling member. Then, the joint member that couples the suspension member and the traction member is supported by the suspension member so as to swing when one of the two traction members is broken (or relaxed). Therefore, the joint member and the drop motion restricting means are connected by the interlocking means so that the drop motion restricting means is started in conjunction with the swinging motion and the drop motion of the joint member. As a result, when an excessive load is applied to the suspension member, one of the traction members is broken, and even when the other is normally pulled, the drop motion regulating means is activated. Therefore, it is possible to warn the user of abnormality of the traction member. The configuration will be described in detail below.

  A suspension member 10 that supports a heavy object, a chain, rope, or other traction member 15 that suspends and supports the suspension member 10, a hoisting device 20 that winds the traction member 15, and prevents the suspension member 10 from dropping or A dropping motion restricting means (locking mechanism described later) 33 for braking and an actuating means 45 for activating the dropping motion restricting means 33 when the pulling member 15 is broken or relaxed are provided. The actuating means 45 is constituted by a joint member 40 that couples the pulling member 15 and the suspension member 10, and the joint member 40 is connected to the hoisting device 20 by at least two pulling members 15a and 15b. Therefore, the joint member 40 is axially supported by the suspension member 10 so as to swing when one of the two pulling members 15a and 15b is broken or relaxed. Further, the joint member 40 and the actuating means 45 are connected so that the drop motion restricting means is activated in conjunction with the swinging motion and the drop motion of the joint member 40.

  The drop movement restricting means 33 is disposed so as to be freely engageable and disengageable between the guide member 31 that winds the suspension member 10 and guides the suspension member 10 in the vertical direction, and the suspension member 10 and the guide member 31. The lock claw members 34 and 35 for engaging the guide member 31 and the biasing means 37 for biasing the lock claw members 34 and 35 so as to engage with the guide member 31 are configured. The actuating means 45 is constituted by interlocking means for connecting the joint member 40 and the biasing means 37. This interlocking means prevents the suspension member 10 from falling by engaging the lock claw member 35 with the guide member 31 by the biasing means 37 in conjunction with the swinging motion and dropping motion of the joint member 40. Configure as follows.

The interlocking means includes an arm member 46 that detects the swinging motion of the joint member 40, and
The arm member 46 and the interlocking chain member 48 that connects the lock claw member 35 are configured. The arm member 46 is engaged with the joint member 40 so that the interlocking chain member 48 is relaxed by the swinging motion of the joint member 40. Therefore, the interlocking chain member 48 is relaxed by the swinging motion and dropping motion of the joint member 40, and the lock claw member 35 is configured to lock the suspension member 10 to the guide member 31.

  The hoisting device according to the present invention includes a drive rotary shaft 22, a sprocket 23 provided on the drive rotary shaft 22, first and second traction members 15a and 15b connected to the sprocket 23, and the above The suspension member 10 connected to the first and second traction members and supporting the heavy load by suspending, the drop movement restricting means 33 for preventing or braking the suspension member 10, and the first and second traction members And an actuating means 45 for actuating the drop motion restricting means 33 by breaking or loosening the members 15a and 15b. The actuating means 45 is constituted by a joint member 40 that couples the first and second pulling members 15 a and 15 b and the suspension member 10. Therefore, the joint member 40 is axially supported by the suspension member 10 so as to swing when one of the first and second pulling members 15a, 15b is broken or relaxed, and the operating means 45 is connected to the joint member 40. And the drop motion restricting means 33 are connected to each other, and the interlock means operates the drop motion restricting means 33 by the swinging motion and the drop motion of the joint member 40 to drop the suspension member 10. Configure to prevent.

  In the present invention, since the drop movement restricting means arranged on the suspension member for coupling the lifted object is configured to operate when one of the two traction members is broken, one of the two traction members is broken. On the other hand, even if the other is in a normal traction state, the drop motion restricting means is activated.

  Therefore, when one of the traction members breaks due to metal fatigue or external impact, the suspension member can be locked and stopped at that position, or can be braked and lowered gently to land. This makes it possible to repair the apparatus without waiting for the breakage of the other pulling member that does not cause breakage, and at the same time, it is possible to prevent an accident due to a destructive breakage of the pulling member.

  In addition, the configuration for that purpose is to support the joint member that connects the pulling member and the suspension member so that the joint member swings when one of the two pulling members breaks (or relaxes). The movement and the drop movement may be linked to the drop regulating means by an interlocking chain member or the like, and the structure is extremely simple and inexpensive.

  Further, the drop movement restricting means is configured to lock the drop of the suspension member with a lock claw member that can be freely engaged with and disengaged from the guide member that winds the suspension member and guides it in the vertical direction. By interlocking with the swinging and dropping motion of the member, it is possible to mechanically detect a breakage abnormality of the traction member and activate the fall prevention mechanism. For this reason, the accident which a lifted object falls by an electrical malfunction is not caused.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is an overall configuration diagram of a fall prevention mechanism in a hoisting apparatus according to the present invention, and FIG. 2 is a side view of an essential part thereof. FIG. 3 is an explanatory diagram of the configuration of the drop motion regulating means in the apparatus of FIG. FIG. 4 is an explanatory diagram of a joint structure of the pulling member and the suspension member in the apparatus of FIG.

  The fall prevention mechanism according to the present invention includes a suspension member 10 that connects a lift W, a pulling member 15 that supports the suspension member 10 in a suspended manner, a hoisting device 20 that winds up the pulling member 15, and the suspension member 10. It is comprised from the fall movement control means 33 which prevents fall of this.

[Configuration of suspension member]
The suspension member 10 is configured as a member that couples and supports the lift W and is suspended by a pulling member 15 described later. The illustrated apparatus shows a case where the suspension member 10 is configured as a suspension frame 12. The suspension frame 12 has a frame structure in which four beam steels are combined as shown in FIG. That is, as shown in FIG. 2, a pair of horizontal beam members 12a and 12b are arranged in parallel in the front and rear at a predetermined interval, and the front and rear horizontal beam members 12a and 12b are joined by a pair of left and right vertical beam members 12c and 12d. It has a framework structure. In the illustrated apparatus, as shown in FIG. 5, suspension balances 11a and 11b are suspended and supported by the suspension frame 12, and a lift W is suspended from the suspension balances 11a and 11b.

  In addition, the suspension member 10 is not limited to the above-described structure, and may be configured with a suspension balance structure as shown in FIG. 5, for example. In this case, a “joint” described later on the suspension balances 11a and 11b. “Member” and “Falling movement restricting means” are arranged. Further, the suspension member 10 may have a suspension block structure (not shown).

[Configuration of towing member]
The above-described suspension member 10 is suspended and supported by the pulling member 15. The pulling member 15 is composed of a suspension member such as a chain or a wire rope. The lower end portion of the pulling member 15 is connected to the suspension member 10, and the upper end portion is connected to a winding device 20 described later. The present invention is characterized in that the suspension member 10 is suspended and supported by two pulling members 15 (15a, 15b). The connection structure will be described later.

[Configuration of winding device]
Various structures are known as the winding device 20, and any of them can be used in the present invention.
For example, the structure shown in FIG. A drive rotary shaft 22 is supported in the apparatus housing 21, and first and second sprockets 23 a and 23 b are mounted on the drive rotary shaft 22. The drive rotary shaft 22 is connected to a drive chain or a drive motor M that manually rotates the drive rotary shaft 22. The illustrated apparatus shows a case where the drive rotating shaft 22 is driven and rotated by the drive motor M, and the illustrated apparatus 24 is a reduction gear box. The device housing 21 is equipped with an electrical box (not shown) and a storage bucket (not shown) for the winding chain.

  A power supply circuit and a control circuit are connected to the winding device 20 configured as described above. In particular, the illustrated apparatus has first, second, and two sprockets 23a and 23b mounted on the drive rotary shaft 22 in order to wind up the first and second traction members 15a and 15b. Therefore, the first traction member 15a (the chain shown in the figure) is meshed with the first sprocket 23a, and the second traction member 15b is meshed with the second sprocket 23b.

  A control circuit (not shown) connected to the hoisting device 20 is provided with an abnormality detecting means for detecting an excessive load of the drive motor M, and stops the drive motor M when a load torque exceeding a predetermined value is applied to the sprocket. It is configured. This control circuit is configured to stop the drive motor M in response to signals from break detection sensors Sa and Sb (described later) for detecting breakage of the pulling member 15 described later.

[Composition of joint members]
The first and second pulling members 15a and 15b fitted to the winding device 20 are connected to the suspension member 10 by the joint member 40 as follows. As shown in FIG. 5, the joint member 40 is a connecting steel plate having an appropriate shape, and is configured to have a mechanical strength that supports the lifted object W in a suspended manner. The joint rod 41 that couples the suspension member 10 with the joint member 40 and the first and second pulling members 15a and 15b are joined at three points. The illustrated joint member 40 is composed of steel plates 40a and 40b facing each other as shown in FIG. The first pulling member 15a is connected to the first connecting pin 42a shown in FIG. 1, the second pulling member 15b is connected to the second connecting pin 42b, and the upper end of the connecting rod 41 is connected to the third connecting pin 42c. Has been. And this coupling | bond part is arrange | positioned so that it may be located in the vertex of an isosceles triangle substantially as shown in FIG. Further, the lower end portion of the connecting rod 41 is coupled to the suspension member 10 (the aforementioned horizontal beam member 12a) with a nut 10x so as to be slidable up and down. Therefore, the joint member 40 and the suspension member 10 are slidably connected so as to form a small gap G as shown in FIG.

  In particular, the joint member 40 of the present invention is configured so that the joint member 40 swings when one of the first and second traction members 15a and 15b is broken. For this reason, the joint member 40 is coupled to be rotatable about the third coupling pin 42c that couples the coupling rod 41. The joint member 40 is provided with an operating means 45 for detecting the broken state of the first and second pulling members 15a and 15b and operating the drop motion restricting means and the break detecting sensors Sa and Sb as described later. Has been.

[Configuration of falling motion control means]
The above-described suspension member 10 is provided with a drop movement restricting means 33 for preventing or braking the drop. The drop movement restricting means 33 includes a guide member 31 that guides the suspension member 10 in the up and down direction, and a movement restriction means that restricts the movement of the suspension member 10 so as to prevent the suspension member 10 from dropping. This movement restricting means is constituted by, for example, a lock claw (fixed claw 34, movable claw 35) described later or a detachable brake shoe member (not shown) for braking the dropping of the suspension member 10.

  FIG. 3 shows a configuration of “dropping movement regulating means for preventing the suspension member from dropping”. The suspension member 10 is provided with a guide member 31 that guides its vertical movement. The guide member 31 includes a telescopic lifting guide or a columnar guide rail, and guides the suspension member 10 in the up and down direction. The illustrated guide member 31 hangs down from the ceiling of the building (for example, a traveling frame of an overhead crane) to guide the suspension member 10, and the guide member 31 extends and contracts vertically according to the height position of the suspension member. It consists of a telescopic lift guide. In the illustrated apparatus, the suspension member 10 is composed of the suspension frame body 12 having four sides, and a telescopic guide member 31 is disposed at four corner portions thereof.

  Accordingly, the suspension member 10 fixes and supports the lifting object W downward, and the four corner portions are suspended and supported by the four hoisting devices 20 by the pulling member 15. That is, the hoisting device 20 shown in FIG. 1 is arranged so as to individually suspend and support the four corners of the four-sided suspension member 10. The suspension member 10 is suspended and supported by two pulling members 15a and 15b from each winding device 20. At the same time, the suspension member 10 is configured to be fitted and supported by guide members 31 (telescopic lifting guides) suspended from above at four corners, and to move up and down along the guide members 31.

  The guide member 31 is not limited to the telescopic lifting guide as shown in the figure, and for example, a columnar guide rail may be installed in a building, and this guide rail may be used. Further, as long as the guide member 31 has a guide structure that firmly supports the lifted object W, the guide member 31 may be configured by one instead of by four as illustrated.

[Configuration of locking mechanism]
Next, the configuration of the motion regulating means shown in FIGS. 3 (a) and 3 (b) will be described. Between the above-described guide member 31 and the suspension member 10, a detachable lock mechanism 33 that prevents the suspension member from dropping is provided. The lock mechanism 33 includes a pair of lock claws 34 and 35 that mesh with each other, an inclined cam member 36 that meshes the pair of lock claws with each other, and an urging spring (biasing means; the same applies hereinafter) 37. Has been.

  A saw-tooth shaped locking claw (fixed claw) 34 is arranged on the above-described guide member 31 along the up and down direction of the suspension member 10. The lock claw 34 is fixed to the guide member 31 and includes fixed teeth having mechanical strength for supporting the suspension member 10 and the lifted object W supported by the suspension member 10. On the other hand, the suspension member 10 is provided with a lock claw 35 (movable claw) that meshes with the lock claw 34 (fixed claw). The lock claw (movable claw) 35 is configured to be movable in the engagement direction (left and right direction in FIG. 3 (a)) so as to be freely disengageable with respect to the lock claw (fixed claw) 34. It is slidably attached to. The movable claw 35 is integrally provided with a cam groove 35c having a tapered surface 35b. The suspension member 10 is provided with an inclined cam 36 that engages with the cam groove 35c. The illustrated inclined cam 36 is composed of a slidac member fixed to an apparatus frame (not shown), and a floating roller is provided on the surface that contacts the tapered surface 35b. When the control plate 39 is moved upward in FIG. 3, the tapered surface 35b of the movable claw 35 and the inclined cam 36 so that the tooth surface 35a of the movable claw 35 mounted on the control plate 39 engages the tooth surface 34a of the fixed claw 34. And are to be engaged. The control plate 39 is provided with urging springs (urging means) 37a and 37b so that the movable claw 35 is always engaged with the fixed claw 34.

  Accordingly, when the control plate 39 on which the movable claw 35 is mounted is moved upward in FIG. 3A by the urging springs 37 a and 37 b, the tapered surface 35 b of the movable claw 35 is along the inclined cam 36 and the tooth surface 35 a is the fixed claw 34. It will engage with the tooth surface 34a. Further, when the control plate 39 is pushed down against the biasing springs 37 a and 37 b in FIG. 3B, the tooth surface 35 a of the movable claw 35 is detached from the tooth surface 34 a of the fixed claw 34. The control plate 39 is connected to the joint member 40 by an operating means 45 described later.

  In addition, although the case where a lock mechanism was employ | adopted as a fall motion control means was demonstrated, you may comprise the fall motion control means of this invention with a brake mechanism. In this case, it is also possible to arrange the brake member so that it can be freely engaged and disengaged with the guide member arranged in the up-and-down direction of the suspension member 10 and to gently land the suspension member with the brake member.

[Configuration of Actuating Means]
In order to operate the drop motion restricting means 33 when the pulling member 15 is broken, the joint member 40 is provided with the following actuating means 45.
The actuating means 45 is disposed on the suspension member 10 and has a cotter detection arm (arm member; the same applies hereinafter) 46 for detecting the “swinging motion” and “falling motion” of the joint member 40, and the arm member 46. The cotter detection shaft 47 operates, and the interlocking chain member 48 connects the cotter detection arm 46 and the control plate 39 described above. And when one of the above-mentioned pulling members 15a and 15b is broken, the above-mentioned drop motion restricting means 33 is configured to operate when both of them are broken.

  Therefore, as shown in FIG. 4, the cotter detection arm (hereinafter referred to as “arm member”) 46 is disposed on a movable frame 49 a that is fitted to a fixed frame 49 b integrally attached to the suspension member 10 so as to be movable up and down. ing. The arm member 46 is rotatably supported by a movable frame 49a by a support shaft 46a, and a tip end portion 46x abuts against a cotter detection shaft 47. The cotter detection shaft 47 is fitted and supported on the movable frame 49a so as to be movable up and down, and is urged upward by a spring 50 in FIG. The distal end portion 47 a of the cotter detection shaft 47 is engaged with a cam protrusion (bending piece) 51 disposed in the vicinity of the third coupling pin 42 c of the joint member 40.

  Therefore, when one of the first and second traction members 15a and 15b connected to the joint member 40 breaks, the joint member 40 rotates in the clockwise direction or the counterclockwise direction in FIG. 4 around the third coupling pin 42c. The cam projection 51 is also rotated by this clockwise or counterclockwise rotation, and the cotter detection shaft 47 engaged therewith moves upward in FIG. Then, the arm member 46 swings around the support shaft 46a from the state of FIG. 4 to the state of FIG. The interlocking chain member 48 is relaxed and loosened by the swinging of the arm member 46.

  Breakage detection sensors Sa and Sb are arranged on the arm member 46 described above. This breakage (relaxation) detection sensor Sa is disposed on the aforementioned movable frame 49a, and the arm member 46 detects the state (ON) of FIG. 4 and the state (OFF) of FIG. 6 or FIG. When the breakage (relaxation) detection sensor Sa is OFF, it is identified that one of the first and second pulling members 15a and 15b is broken.

  The breakage detection sensor Sb is attached to the fixed frame 49b of the suspension member 10 by a sensor receiver 52. And the detection part of the fracture | rupture detection sensor Sb is attached so that the fall detection board (striker) 53 attached to the above-mentioned movable frame 49a may be contacted. Therefore, the fixed frame 49b and the movable frame 49b form a gap G (see FIG. 8) by the connecting rod 41 that connects the joint member 40 and the suspension member 10 described above. Therefore, when the joint member 40 is suspended upward, the sensor Sb is maintained in the ON state, and when both the first and second traction members 15a and 15b are both broken, the sensor Sb is in the OFF state. The breakage of the second pulling members 15a and 15b is identified.

  And it is comprised so that the drive motor M of the above-mentioned winding device 20 may be stopped with the signal from the above-mentioned fracture | rupture detection sensors Sa and Sb.

[Operational state of motion control means]
Next, based on FIG. 6, a state when the first and second pulling members 15a and 15b are broken will be described. 6 shows the operating state when the first traction member 15a is broken, FIG. 7 shows the operating state when the second traction member 15b fails, and FIG. 8 shows the first and second traction members 15a and 15b. Shows the operation state when both are broken.

  In FIG. 6, when the first pulling member 15a is broken, the joint member 40 is supported by being suspended by the second pulling member 15b. At this time, the tension F acts on the joint member 40 at a position separated by L1 in the drawing centering on the third coupling pin 42c, and the joint member 40 rotates clockwise around the third coupling pin 42c. Then, the arm member 46 swings counterclockwise around the support shaft 46a. As a result, the interlocking chain member 48 connected to the arm member 46 is loosened and loosened, and the control plate 39 connected to the other end of the interlocking chain member 48 is moved to the state shown in FIG. 3B by the urging springs 37a and 37b. To rise.

  Therefore, the aforementioned movable claw 35 attached to the control plate 39 meshes with the fixed claw 34. The suspension member 10 is mechanically locked to the guide member 31 by the coupling of the both lock claws 34 and 35, and is held in that position. The oscillating motion of the joint member 40 is detected by the breaking (relaxation) detection sensor Sa, and the drive motor M is stopped by the signal.

  In FIG. 7, when the second pulling member 15b is broken, the joint member 40 is supported by being suspended by the first pulling member 15a. At this time, a tension F acts on the joint member 40 at a position separated by L2 in the drawing centering on the third coupling pin 42c, and the joint member 40 rotates counterclockwise around the third coupling pin 42c. Then, the arm member 46 swings counterclockwise around the support shaft 46a. The subsequent operation is the same as described above.

  In FIG. 8, when the first and second traction members 15 a and 15 b are broken at the same time, the joint member 40 falls together with the suspension member 10 and the lifted object W. At this time, when the joint member 40 falls from the broken line position (normal state) to the solid line position (fall state), the arm member 46 and the edge of the interlocking chain member 48 connected thereto also move by the distance L3 shown in the figure. . As a result, the interlocking chain member 48 is loosened and loosened. Due to the relaxation of the interlocking chain member, the lock mechanism 33 is operated in the same manner as described above. At this time, the breakage detection sensor Sb detects the falling motion of the suspension member 10 (the state where the illustrated gap G is formed), and the drive motor M is stopped by the signal.

Explanatory drawing of the whole structure of the fall prevention mechanism in the winding device concerning this invention. Explanatory drawing which shows the side surface of the apparatus of FIG. It is explanatory drawing which shows the structure of the fall movement control means in the apparatus of FIG. 1, (a) shows the non-operation state when a traction member is normal, (b) shows the operation state when a traction member fractures, respectively. . Explanatory drawing which shows the structure of the joint member in the apparatus of FIG. The structure of the suspension member in the apparatus of FIG. 1 is shown, and the form which supports a lifting thing with a suspension balance is shown. FIG. 6 is an operation state explanatory diagram illustrating a state when the “first traction member” of the joint member in FIG. 4 is broken. FIG. 5 is an operation state explanatory diagram illustrating a state when the “second pulling member” of the joint member in FIG. 4 is broken. FIG. 5 is an operation state explanatory diagram illustrating a state when the “first traction member” and the “second traction member” of the joint member in FIG. 4 are broken.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suspension member 10x Nut 11a, 11b Suspension balance 12 Suspension frame body 12a, 12b Lateral beam material 12c, 12d Lateral beam coupling | bonding material 15a 1st traction member 15b 2nd traction member 20 Hoisting device 21 Device housing 22 Drive rotating shaft 23a First sprocket 23b Second sprocket 24 Deceleration gear box 31 Guide member 33 Drop motion restricting means (lock mechanism)
34 Locking claw (fixing claw)
34a Tooth surface 35 Lock claw (movable claw)
35c Cam groove 36 Inclined cam member 37 Energizing means (urging spring)
40 joint member 40a steel plate 40b steel plate 41 connecting rod 42a first connecting pin 42b second connecting pin 42c third connecting pin 45 actuating means 46 arm member (cotter detection arm)
46a support shaft 47 cotter detection shaft 48 interlocking chain member 49a movable frame (sub-frame)
49b Fixed frame 50 Spring 51 Cam projection 52 Sensor receiver 53 Fall detection plate (striker)
Sa Breaking (relaxation) detection sensor Sb Breaking detection sensor W Lifting object

Claims (4)

A suspension member for supporting a heavy object;
A chain, a rope or other pulling member for supporting the suspension member by hanging;
A hoisting device for hoisting the traction member;
A drop movement restricting means for preventing or braking the suspension member;
An actuating means for activating the drop motion restricting means by breaking or loosening the pulling member;
With
The operating means is composed of a joint member that couples the pulling member and the suspension member,
The joint member is connected to the hoisting device by at least two traction members;
The joint member is axially supported by the suspension member so as to swing when one of the two pulling members is broken or relaxed,
The fall prevention mechanism in the hoisting apparatus, wherein the joint member and the actuating means are connected so that the drop motion restricting means is activated in conjunction with the swinging motion and dropping motion of the joint member. The falling motion regulating means is
A guide member that winds the suspension member up and down and guides the suspension member;
A lock claw member that is detachably disposed between the suspension member and the guide member and locks the fall of the suspension member;
Urging means for urging the lock claw member to engage the guide member;
Consists of
The actuating means is composed of interlocking means for connecting the joint member and the biasing means,
The interlocking means is configured to prevent the suspension member from falling by engaging the lock claw member with the guide member by the biasing means in conjunction with the swinging motion and dropping motion of the joint member. The fall prevention mechanism in the winding device according to claim 1. The interlocking means is
An arm member for detecting a swinging motion of the joint member;
An interlocking chain member connecting the arm member and the lock claw member;
Consists of
The arm member is engaged with the joint member such that the interlocking chain member is loosened by a swinging motion and a dropping motion of the joint member,
The drop in the hoisting device according to claim 2, wherein the interlocking chain member is loosened by a swinging motion and a dropping motion of the joint member, and the lock claw member locks the suspension member to the guide member. Prevention mechanism. A driving rotary shaft;
A load sheave mounted on the drive rotary shaft,
First and second traction members connected to the load sheave;
A suspension member connected to the first and second traction members and supporting the heavy load by suspension;
A drop movement restricting means for preventing or braking the suspension member;
Actuating means for actuating the drop motion restricting means by breaking or loosening of the first and second traction members,
The actuating means is constituted by a joint member that couples the first and second traction members and the suspension member,
The joint member is axially supported by the suspension member so as to swing when one of the first and second traction members is broken or relaxed,
The actuating means comprises interlocking means for connecting the joint member and the drop motion restricting means, and the interlock means operates the drop motion restricting means by swinging motion and drop motion of the joint member to A hoisting device configured to prevent a member from falling.

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