JPH0912282A - Electric raising and lowering device - Google Patents

Abstract

PURPOSE: To provide an electric raising and lowering device capable of preventing poor operation of a lock mechanism, to be generated caused by torsion of a wire rope on the way of raising and lowering of a raising and lowering part. CONSTITUTION: A torsion detecting mechanism 15 provided with a torsion detecting element 62 attached on a device frame 11 side in which an electric winding device 12 is housed, and to follow the torsion of a wire rope 13 during the raising and lowering operation of a raising and lowering part 14, and a limit switch 61 inserted in a driving circuit of a device 12, and to be turned on and off through the detecting element 62 is provided. The detecting element 62 is provided with a pivot shaft fitting hole in the intermediate part and formed into a bell crank shape, a rope passing hole 64 through which a rope 13 is to be inserted is provided on a first crank arm, and the switch 61 is turned on and off by a second crank arm. The detecting element 63 is rotatably supported by fitting a pivot shaft 63 provided on the frame 11 side into a pivot shaft fitting hole, and the tips of the arms are provided on an actuator of the switch 61 so as to be approached and faced to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a factory, a gymnasium, an arena, a large store, a warehouse, a hall or an entrance, or a lighting fixture arranged in a ceiling or a high place such as a stairway of a large building such as a hotel or devert. The present invention relates to an electric lifting device capable of lifting and lowering suspended objects by a wire rope.

[0002]

2. Description of the Related Art Providing an illuminating device arranged on a high ceiling of a gymnasium or the like so that it can be moved up and down by an electric lifting device is excellent in that it facilitates maintenance of the illuminating device. As shown in FIG. 8, this type of electric lifting device includes a device frame 1 arranged at a high place on the ceiling side, a winding drum 2 and a drive motor 3 capable of rotating the winding drum 2 in a forward and reverse direction. 1, an electric winding device 4 incorporated therein, a wire rope 5 which is wound and rewound on the winding drum 2 by the operation of the winding device 4, and a lighting device 6 which is hung by the wire rope 5 and the like. And an elevating section 7 for connecting and supporting the suspended object, and by winding and rewinding the wire rope 5, the lighting fixture 6 can be moved up and down together with the elevating section 7.

In the example shown in FIG. 8, one end of the wire rope 5 is fixed to the winding drum 2 and the other end is fixed to the fixing portion 8. Reference numerals 9a and 9b in FIG. 8 denote grooved pulleys built in the elevating part 7, around which an intermediate part of the wire rope 5 is stretched.

In addition, in this type of electric lifting device, a lock component forming a lock mechanism (not shown) is shared between the device frame 1 and the lifting part 7, and the lifting part 7 has a predetermined height. When the position is reached, the lock component on the side of the apparatus frame 1 and the lock component on the side of the elevating unit 7 are mechanically engaged with each other, thereby mechanically supporting the elevating unit 7. further,
In this mechanically supported state, a power supply terminal (not shown) on the device frame 1 side and a power receiving terminal (not shown) on the elevating part 7 side are in contact with each other, and electrical connection to these enables power supply to the lighting fixture 6. I have to.

[0005]

By the way, the luminaire 6 may rotate together with the elevating part 7 during the elevating part of the elevating part 7, and in such a situation, the winding drum 2 of the wire rope 5 and one pulley. 9a and the rope portion between the fixed portion 8 and the other pulley 9b intersect without maintaining a parallel posture, and the wire rope 5
Will be twisted.

However, since the conventional electric lifting device does not take measures against the twisting of the wire rope 5, when the lifting part 7 is lifted while the twisting occurs, the lock on the device frame 1 side is caused. There is a problem that a mechanical engagement defect between the component and the lock component on the elevating part 7 side is likely to occur and a contact defect between the power feeding terminal and the power receiving terminal is likely to occur.

An object of the present invention is to prevent malfunction of the lock mechanism or the like due to twisting of the wire rope while the elevator is being raised, and for that reason, the twist detecting mechanism for detecting twist is simple in structure. The purpose of the present invention is to obtain an electric lifting device in which twisting detection operation is performed without difficulty.

[0008]

In order to achieve the above-mentioned object, an electric lifting device according to the present invention is capable of rotating a device frame arranged at a high place on the ceiling side, a winding drum, and forward / reverse rotation for rotating the winding drum. An electric winding device equipped with a drive motor and incorporated in the device frame, a wire rope that is wound and unwound on the winding drum by the operation of the winding device, and a lifting unit that is hung by this wire rope. And a twist detector attached to the device frame side and moved according to the twist of the wire rope during the lifting operation of the lifting unit, and inserted into the drive circuit of the drive motor to turn on through the twist detector. And a twist detection mechanism that has a limit switch that is turned off and that detects the twist of the wire rope.

The twist detector has a bell crank shape having a pivot fitting hole at an intermediate portion where the first crank arm and the second crank arm are connected to each other, and the wire is attached to the first crank arm. A rope through hole is provided for the rope to penetrate, and the limit switch is turned on and off by the second crank arm.
The twist detector is rotatably supported by fitting the pivot fitting hole into a pivot provided on the apparatus frame side, and the tip of the second crank arm is brought close to the actuator of the limit switch. It is characterized by being provided facing each other.

[0010]

In the electric hoisting device having the above-described structure, the electric winding device in the device frame operates the drive motor to rotate the winding drum in the normal direction or the reverse direction to wind the wire rope on the drum. Rewind the wound wire rope. As a result, the elevating part suspended from the wire rope is moved up and down together with the suspended object connected thereto. Then, this raising / lowering operation is executed in a state where the limit switch of the twist detection mechanism is turned on.

Since the twist detection mechanism is provided with a twist detector which is rotated following the twist of the wire rope and a limit switch which is turned on / off by the detector, its structure is simple.

The twist detector rotates about the pivot in which the pivot fitting hole fits and the wire rope is twisted because the wire rope is passed through the rope through hole of the first crank arm. Then, following this, the twist detector rotates about the pivot, and at the same time, the tip of the second crank arm pushes the actuator of the limit switch to turn it off.

Then, the operation of the drive motor is interrupted, and the lifting operation of the elevating unit is also interrupted. Therefore, the reaction force of the wire rope is generated by the reaction force of the wire rope based on the disappearance of the motion of continuing the rotation of the elevating unit during the interruption period. The twist of the is eliminated. Along with the elimination of the twist, the twist detector is rotated in the opposite direction to that when the twist is detected, so that the tip of the second crank arm moves away from the actuator of the limit switch. Therefore, the switch is turned on to restart the operation of the drive motor, and the elevating operation of the elevating part can be resumed in a state where the wire rope is not twisted.

In addition, since the twist detector rotates around the pivot axis following the wire rope, the direction of rotation and the direction in which the wire rope is about to be twisted or the direction in which the twist is about to be released are substantially the same. You can do the same.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The electric lifting device according to the present embodiment is provided with a device frame 11, an electric winding device 12, a wire rope 13, an elevating part 14, and a twist detection mechanism 15, as schematically shown in FIG. 1. ing.

The device frame 11 is installed on a high ceiling of a facility such as a gymnasium, and an electric winding device 12 is built in this. As shown in FIGS. 3 and 4, the device 12 is fixed to the lower surface of a frame base 11a of the device frame 11 via a fixing bracket 21. The electric winding device 12 includes a drive motor 22 capable of rotating in the forward and reverse directions, a gear reducer 23, and a winding drum 24 connected to an output shaft of the reducer 23.

A brake (not shown) is attached to the drive motor 22. The brake always works to provide a friction braking force when the drive motor 22 is stopped and a friction control when the drive motor 22 is operating. The drive motor 22 is operated to release the power or resist the braking force. The winding drum 24 shown in FIGS. 3 and 4 is of a single drum type, for example.

A lock mechanism base 25 is fixed to the lower surface of the frame base 11a side by side with the electric winding device 12, and a device frame side locking component 26 is attached to the lower wall of the base 25.
Is protruding. The lock component 26 is a trumpet-shaped member whose lower end gradually expands, and has an engaging claw (not shown) rotatably incorporated therein.

On the lower wall of the lock mechanism base 25, a pair of guide shafts 27, which are located on both sides of the lock component 26 and have a tapered front end, are provided to project, and the terminal base 28 moves up and down across these shafts 27. Installed as possible. Terminal base 28
Has a lower position defined by a plurality of stopper shafts 29 (only one is shown in FIG. 2 as a representative), and is constantly urged downward by a coil spring 30 wound around the guide shaft 27 to move upward. It is displaceable. A terminal bracket 32 to which a plurality of power supply terminals 31 are attached is fixed to the lower surface of the terminal base 28. Each power supply terminal 32
Are urged downward by coil springs 33, respectively.

As shown in FIG. 3, the terminal base 28 has a through hole 28a through which the lock component 26 passes. Positioning portions 28b are bent vertically downward at both ends of the terminal base 28, and positioning grooves 34 are formed in the bent portions 28b.

As shown in FIGS. 3 and 4, on the lower surface of the frame base 11a, the lock mechanism base 25 is located on the side opposite to the electric winding device 12, and the terminal block,
A circuit board 35 on which various electrical parts such as a switch and a relay are mounted is attached. Note that FIG. 2 is illustrated with the circuit board 35 omitted.

The wire rope 13 is wound around the winding drum 24 with one end thereof fixed to the winding drum 24. The wire rope 13 is pulled out of the device frame 11 via the first and second grooved guide pulleys 36 and 37, and further inverted upward so as to be inverted.
The fixing portion 38 which is located inside and has the other end shown in FIG.
It is connected to and provided. The fixing portion 38 is provided on the frame base 11a or a member (not shown) connected to the frame base 11a.

A rope escape hole 39 (see FIGS. 4 and 5) is provided at one end in the longitudinal direction of the lower wall of the lock mechanism base 25 so as to face directly below the fixing portion 38, and the wire rope is provided in the escape hole 39. The other end side rope portion of 13 is passed. The rope escape hole 39 is a hole much larger than the diameter of the wire rope 13,
When the wire is twisted, the other end side rope portion is allowed to move in the rope escape hole 39, and the twisting operation of the wire rope 13 is not hindered in the rope escape hole 39.

As shown in FIG. 4, the first and second guide pulleys 36 and 37 are rotatably supported by pulley brackets 40 and 41, respectively, and these brackets 40 and 41 are fixed to the lower surface of the frame base 11a, respectively. There is. First
The pulley bracket 40 is arranged on the side of the circuit board 35, and the second pulley bracket 42 is arranged on the lock mechanism base 25.
It is arranged beside.

An elevating part 14 is provided at an intermediate part of the wire rope 13.
Is suspended. As shown in FIGS. 1 and 2, the elevating section 14 has a pair of grooved pulleys 51 a and 51 b, and the intermediate portion of the wire rope 13 is passed through the elevating section 14 via these. Therefore, the wire rope 13
Is inverted up and down so as to draw a substantially U shape around the elevating part 14.

As shown in FIGS. 2 and 3, the lifting unit 1
4 has a pair of fitting frames 52 that are individually positioned on the upper side of both pulleys 51a and 51b and that are inserted into and removed from the positioning groove 34 from the lower side, and a terminal base 53 positioned between these frames 52. , And a terminal block base 54. The horizontal plate-shaped portion of the terminal base 53 has a plurality of power receiving terminals 5 which are connected to and separated from the power feeding terminal 31 from below.
5 is attached and is a vertical terminal block base 5
A terminal block 56 is attached to the terminal 4.

As shown in FIGS. 2 and 3, the lifting unit 1
4 has a suspended object connecting plate 57 at the bottom thereof, to which an instrument mounting base 58 is connected as shown in FIG. Incidentally, 57a in FIG. 3 is a wiring through hole. Two lighting fixtures 59 as suspended objects are attached to the fixture mounting base 58. This lighting equipment 59
When the elevating part 14 is supported by the device frame 11 by the lock mechanism, it is energized and turned on through the electrical connection between the power supply terminal 31 and the power reception terminal 55 that are in contact with each other.

The elevating part 14 has an elevating part side locking part 60 forming a locking mechanism together with the device frame side locking part 26 in the center thereof. The lock component 60 is an upward shaft, and is inserted into and removed from the lock component 26 from below. The lock component 60 has an engagement recess (not shown), and is provided in the lock component 26.
The engaging claw 6 is disengaged from the engaging recess. By the engagement, the lock parts 26 and 60 are connected, and the elevating part 14 is mechanically supported at a predetermined position of the apparatus frame 11, and the elevating part 14 and the lighting fixture 59 are attached to the wire rope 13.
The weight is not added. In addition, the lifting unit 14
The fitting frame 52 is provided with a positioning hole (not shown) into which the lower end of the guide shaft 27 is fitted. It is supposed to be positioned.

The twist detection mechanism 15 will be described. As shown in FIG. 5, the twist detection mechanism 15 includes a limit switch 61, a twist detector 62, and a pivot 63. The pivot 63 is, for example, a screw. The pivot 63 is located in the vicinity of the rope escape hole 39 in the bottom wall of the lock mechanism base 25 and is provided by being screwed in from below.

The limit switch 61 is attached to one side wall of the end of the lock mechanism base 25 where the rope escape hole 39 is located. The limit switch 61 is a normally closed type switch that normally keeps the ON state.
It is a switch that is turned off only when a is pressed. The switch 61 is inserted in series with a drive circuit (not shown) of the drive motor 22 and operates the drive motor 22 only when the switch is on (forward rotation and reverse rotation).
Drive motor 22 by turning on and off.
It is designed to cut off electricity to.

As shown in FIGS. 6 (A) and 6 (B), the twist detector 62 has a pivot fitting hole 64 at an intermediate portion where the first crank arm 62a and the second crank arm 62b are connected.
It has a bell crank shape. Axis fitting hole 64
Is slightly larger than the diameter of the shaft portion of the pivot shaft 63. At the tip of the first crank arm 62a, the wire rope 1
A rope through hole 65 through which 3 passes is provided. The rope through hole 65 has a diameter slightly larger than the diameter of the wire rope 13. The second crank arm 62b is the first crank arm 6
It is formed longer than 2a. Although the tip of the arm 62b is bent, for example, it may be straight when the limit switch is attached to the bottom wall.

The twist detector 62 is formed of a synthetic resin or metal molded product, or a single wire material such as a piano wire or a stainless wire for a spring. Forming a single wire such as the stainless wire is advantageous in that it can be obtained at low cost because the material is easily available and no special technique is required for processing. In this embodiment, since the twist detector 62 is formed of such a wire rod, its pivot fitting hole 64 is formed.
Each of the wire through holes 65 and the wire through hole 65 is formed by winding a wire once or more.

As shown in FIG. 5, the twist detector 62 fits a pivot fitting hole 64 into the pivot shaft 63 so as to be rotatably supported, and allows the wire rope 13 to pass through the rope through hole 65. Further, the tip end portion of the second crank arm 62b is provided so as to closely face the actuator 61a of the limit switch 61.

In the electric hoisting device having the above construction, in order to raise the hoisting part 14 lowered to the ground side to the ceiling side high place together with the lighting fixture 59, the drive motor 22 of the electric take-up device 12 is used.
Is reversed, and the wire rope 13 is wound around the winding drum 24.

In that case, since the wire rope 13 is not twisted as shown in FIG.
The twist detection mechanism 15 is formed by the penetrating portion of the rope 13.
The twist detector 62 has a second crank arm 62b.
Is the limit switch 61 actuator 61
It is held in a state of being located away from a. Therefore, the limit switch 61 maintains the ON state.

Then, during the ascent of the elevating part 14,
When the elevating part 14 rotates (the rotation direction is indicated by an arrow E), the winding drum 24 of the wire rope 13 and one pulley 51a of the elevating part 14 as shown in FIG. 7B. The rope portion that extends over and the rope portion that extends over the fixed portion 38 and the other pulley 51b of the elevating portion 14 intersect and twist without maintaining a parallel posture.

By the twist of the wire rope 13, the rope portion extending between the fixed portion 38 and the pulley 51b of the elevating portion 14 is displaced, and the first crank arm 62a of the twist detector 62 is pulled. Therefore, the entire twist detector 62 is rotated about the pivot 63 (the direction of rotation is indicated by arrow F), and at the same time, the tip of the second crank arm 62b is moved in an arc shape, and the limit switch is turned on. The actuator 61a of 61 is pushed, and the switch 61
Off.

Then, the operation of the drive motor 22 of the electric winding device 12 is interrupted, and the elevating operation of the elevating part 24 is also interrupted. Therefore, during this interruption period, the lifting unit 24
Wire rope based on the disappearance of the motion that keeps rotating 1
The twist of the rope 13 is eliminated by the reaction force of 3. As the twist is eliminated, the twist detector 62 is rotated through the wire rope 13 in a direction opposite to the direction in which the twist is detected, and the second crank arm 62b is separated from the limit switch 61. Therefore, the limit switch 61 is turned on and the drive motor 2
The operation of No. 2 is restarted.

Then, for a while, the elevating part 14 repeats forward and reverse rotations, and eventually the twist is released and the elevating part 14 stops, so that the wire rope 13 is twisted as shown in FIG. 7C. The elevating / lowering operation of the elevating / lowering unit 14 is restarted in the absence thereof.

As a result, a fitting failure between the positioning hole (not shown) of the elevating part 14 and the guide shaft 27 on the device frame 11 side, and a fitting failure between the locking parts 26, 60 of the device frame 11 and the elevating part 14 are caused. In addition to the above, it is possible to raise the elevating part 14 to a predetermined height position and mechanically hold it on the device frame 11 by the lock mechanism, and prevent contact failure between the power supply terminal 31 and the power reception terminal 55 in this state. You can

Further, the drive motor 22 of the electric winding device 12
When the elevating part 14 rotates when the elevating part 14 is lowered from the ceiling-side high place to the ground side by rotating the
Since the twist detection mechanism 15 is operated in the same manner as when the wire rope is raised, the wire rope 13 can be lowered in the untwisted state. Therefore, the elevating part 14 and the lighting fixture 59 supported by the elevating part 14 will not be lowered on the floor while rotating.

Further, the twist detector 62 of the twist detecting mechanism 15 which performs the twist detecting operation as described above has a bell-crank shape and performs the above-mentioned operation, but the first crank arm 62a to the second crank arm 62b. Is long,
Since the second crank arm 62b can be largely moved by the lever action and the tip portion thereof can be brought into contact with or separated from the actuator 61a of the limit switch 61, the movement due to the twist of the wire rope 13 or the movement thereof even if small is expanded. The limit switch 61 can be reliably turned on / off. Moreover, the second crank arm 62
By expanding the movement range of the tip portion of b, the degree of freedom in the arrangement of the limit switch 61 can be increased, and accordingly, the degree of freedom in the design of the twist detection mechanism 15 can also be increased.

In particular, the twist detector 62 as in the present embodiment.
Is made of one wire, the second crank arm 6
Since the tip portion of 2b can be bent in any direction, the degree of freedom can be further increased, and the stroke adjustment of the tip portion for turning the limit switch 61 on and off depending on the bending can be easily performed at a construction site or the like. It can be carried out.

Moreover, since the twist detector 62 horizontally rotates about the pivot 63, its movement and the wire rope 13
Can be made to have substantially the same direction of motion as the twisting or the twisting is released. Therefore, the wire rope 13 does not apply an unreasonable force to the twist detector 62, and the twist detector 62 can be made to follow the wire rope 13 reasonably to detect the twist and the twist detector. No special guide or the like is required to move 62.

Further, the twist detection mechanism 15 has a twist detector 62 which is rotated following the twist of the wire rope 13 as described above, and a limit switch which is turned on and off by the contact and separation of the twist detector 62. Since it is equipped with 61,
The structure is simple, and the twist detector 62 is
In this embodiment, which is composed of a wire rod, it can be obtained at a particularly low cost.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the arrangement of the twist detection mechanism 15 is changed so that the twist detector 62 has a wire passage hole 65 through which a rope portion extending between one pulley 51a of the elevating part 14 and the winding drum 24 is passed. You may implement.

The electric winding device of the present invention has a double drum type winding drum in which both ends of the wire rope are fixed, instead of the electric winding device having the single drum type winding drum. An electric winding device may be used.

In the present invention, the suspended object connected to and supported by the elevating part 14 may be something other than an electric device. In that case, the power feeding terminal 31 and the power receiving terminal 5 are used.
5 and its supporting structure may be omitted.

[0049]

As described above in detail, according to the electric lifting device of the present invention, when the wire rope is twisted during the raising / lowering operation of the raising / lowering portion, the twisting is detected and the electric raising / lowering is performed. While the operation of the drive motor of the device is interrupted, the operation of the drive motor is restarted as the twist of the wire rope is eliminated, and the elevating part is moved up and down without the wire rope being twisted. It is possible to prevent malfunction of the lock mechanism due to the twist of the wire rope. Further, since the twist detection mechanism includes the twist detector and the limit switch, the structure thereof is simple. The twisting detection mechanism, when the twisting detector having the bell crank shape is rotated to follow the wire rope, causes the twisting detector centering on the pivot axis to twist the wire rope and release the twisting. The twist can be detected by reasonably following the desired movement.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually showing the structure of an electric lifting device according to an embodiment of the present invention.

FIG. 2 is a side view showing the configuration of the entire electric lifting device according to one embodiment.

FIG. 3 is a perspective view showing the configuration of the entire electric lifting device according to one embodiment.

FIG. 4 is a perspective view showing a configuration around a device frame of an electric lifting device according to an embodiment.

5 is an enlarged perspective view showing an arrow Z portion in FIG. 4. FIG.

FIG. 6A is a plan view showing the configuration of a twist detector included in the twist detection mechanism of the electric lifting device according to the embodiment.
FIG. 3B is a side view showing the configuration of the twist detector provided in the twist detection mechanism of the electric lifting device according to the embodiment.

FIG. 7A is a view for explaining the operation of the twist detection mechanism before the wire rope is twisted. (B) is a figure for demonstrating operation | movement of the twist detection mechanism in the state where the wire rope was twisted. (C) is a figure for demonstrating operation | movement of the twist detection mechanism in the state where the twist of a wire rope was cancelled | released.

FIG. 8 is a view conceptually showing the structure of an electric lifting device according to a conventional example.

[Explanation of symbols]

 11 ... Device frame, 12 ... Electric winding device, 13 ... Wire rope, 14 ... Elevating part, 15 ... Twisting detection mechanism, 22 ... Drive motor, 24 ... Winding drum, 61 ... Limit switch, 61a ... Limit switch actuator Reference numeral 62 ... Twist detector, 62a ... First crank arm of twist detector, 62b ... Second crank arm of twist detector, 63 ... Axis, 64 ... Axis fitting hole, 65 ... Rope through hole.

Claims (1)

[Claims] 1. An electric winding device built in the device frame, comprising a device frame arranged at a high place on the ceiling side, a winding drum and a drive motor capable of rotating the winding drum forward and backward, and the winding device. A wire rope that is wound and unwound on the winding drum by the operation of the take-up device, an elevating part that is hung by this wire rope, and the wire rope that is attached to the device frame side and is in the elevating operation of the elevating part. Twist detection for detecting the twist of the wire rope by having a twist detector that is moved according to the twist of the wire rope, and a limit switch that is inserted into the drive circuit of the drive motor and turned on and off via the twist detector. And a twist detecting element having a pivot fitting hole at an intermediate portion where the first crank arm and the second crank arm are connected to each other, and the twist detecting element has a bell crank shape. The first crank arm has a rope through hole through which the wire rope penetrates, and the second crank arm turns the limit switch on and off. The twist detector is used for the device frame. The pivot fitting hole is fitted to the pivot provided on the side to rotatably support the pivot fitting hole, and the tip end portion of the second crank arm is provided in close proximity to the actuator of the limit switch. Electric lifting device.