JP2012171706A - Hoisting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and simply-structured hoisting device which can be installed in a small space by solving the problem that because a conventional hoisting device uses a method of winding a wire in a short section in the axial direction of a hoisting shaft, the wire is wound in multiple layers, and as the wire is wound, the wound wire becomes big, so that a comparatively wide space is required around the hoisting shaft, and that a complicated guide mechanism is required for aligning the wire so that the wound wire is not wound irregularly.SOLUTION: An angle where a pulling direction of a hoisting wire and the direction of the shaft cross is arranged to be shifted from a right angle. By taking advantage of the fact that the pulling direction of the wire always maintains an angle shifted from a right angle with respect to the direction of a bearing by gravitational force acting on a hoisted load, the wire is aligned and wound in one layer.

Description

The present invention relates to an apparatus for winding a suspended load with a wire such as a string or a rope. In particular, the present invention relates to a small hoisting device installed in a narrow space.

A conventional winding device uses an alignment mechanism or a guide mechanism in order to cleanly align the wire wound on the winding shaft or the drum surface.

For example, FIG. 1 of Japanese Patent Laid-Open No. 9-179513 discloses an alignment mechanism in which the winding drum changes its position as the wire is wound.

Further, for example, FIG. 1 of Japanese Patent Application Laid-Open No. 2003-104689 discloses a mechanism for preventing and preventing random winding by pressing a pressing roll against a winding drum of a crane in order to reduce damage to a wire rope. Yes.

JP-A-9-179513 JP 2003-104689 A

However, since the conventional winding device is a system in which the wire is wound in a short section in the axial direction of the winding shaft, the wire is wound in multiple layers. Therefore, there is a problem that a relatively large space is required around the axis of the winding shaft because the wire is thickened as the wire is wound.

Further, the conventional winding device has a problem that a complicated guide mechanism for aligning the wires is required so that the wound wire does not become a turbulent winding.

The present invention has been made in view of such problems, and has as its constituent elements a wire rod that lifts a suspended load, a shaft that winds the wire rod, a bearing that supports the shaft, and a rotating device that rotates the shaft, The angle at which the pulling direction of the lifting wire and the direction of the shaft intersect is deviated from a right angle, and the pulling direction of the wire always keeps an angle deviating from the right angle with respect to the direction of the bearing by gravity acting on the lifting load. A winding device characterized in that the wire rods are aligned and wound up in a single layer.

According to the present invention, the appropriate tension is always applied to the wire in the vertical direction due to the load of the suspended load, and the appropriate inclination of the winding shaft from the horizontal, as shown in FIG. In addition, since the wire can be wound on the winding shaft in a single roll and closely aligned, a large space around the shaft is not required. In the present invention, since a simple method of inclining the winding shaft by an appropriate angle from the horizontal is adopted, a complicated guide mechanism is not required.
Therefore, even if the space around the axis of the winding shaft is narrow, a small winding device that can be accommodated in the narrow space can be realized. There is an effect that it can be built in.

Here, “tilt the winding shaft from the horizontal” refers to a winding device that freely suspends the wire used for winding in the direction of gravity. For example, when the wire used for winding is temporarily unfolded in the horizontal direction and is turned to the direction of gravity by using a pulley and then suspended, this expression means that the angle between the wire and the winding shaft should be "Please shift."
The following is based on the premise that “the wire used for hoisting is freely suspended in the direction of gravity”, but “the wire used for hoisting is temporarily deployed in the horizontal direction and then oriented in the direction of gravity using a pulley. Even if it is the “switching and hanging method”, it can be achieved by the same replacement.

The side view of a winding device. (A) is a figure which shows the winding start, (b) is a figure which shows the middle of winding. AA 'sectional view of a winding device. The partial side view of a winding position vicinity. (A) is a figure when a winding axis | shaft inclines from horizontal by angle (theta), (b) is a figure when a winding axis | shaft is horizontal. FIG. 3 is a development view of a locus in which a wire is wound in a spiral on the surface of a winding shaft. The side view which shows the condition equipped with the inclination attachment. The principle diagram of a winding completion position detection block. (A) is a figure which shows winding completion position detection, (b) is a sketch of the winding end position detection block. A sketch of a winding completion position detection mechanism using a limit switch. (A) is a side view, (b) is a front view. BB 'sectional drawing of the winding completion position detection mechanism using a limit switch. (A) is a figure which shows the middle of winding, (b) is a figure which shows the end of winding. CC 'sectional drawing of the winding completion position detection mechanism using a limit switch. A sketch showing the operating status of the limit switch The principle diagram of a lowering completion position detection mechanism. (A) is the figure before the limit switch is operated, (b) is the figure after the limit switch is operated. Circuit block diagram of the control device.

Hereinafter, the structure and operation of the winding device according to the present invention will be described with reference to examples. In the description of the present invention, the “winding position” means a position where the wire 3 suspended vertically as shown by the tip of the downward arrow in FIG. In this figure, it is the position of the leftmost end in the horizontal direction of the wire winding line formed by winding the wire 3 around the take-up shaft 2.

FIG. 1 is a side view of the winding device. (A) is a figure which shows the winding start, (b) is a figure which shows the middle of winding. In FIG. 1, in order to make it easy to see the components housed inside the frame 10, the frame 10 is drawn through, and the frame 10 itself is indicated by a broken line.

As shown in FIG. 1, the upper end of the wire 3 is fixed to the winding shaft 2 at the wire fixing point 4. Further, the wire 3 always extends vertically due to the weight of the hanging hook 13 and a suspended load (not shown). One end (the left end in FIG. 1) of the winding shaft 2 is connected to the rotating shaft 6 of the rotating mechanism 5 via the connection component 7. Although details of a method of fixing the connecting component 7 to the winding shaft 2 and the rotating shaft 6 are not shown, an appropriate method such as screwing or bonding can be used. The other end (the right end in FIG. 1) of the winding shaft 2 is supported by a bearing 8.

The rotation mechanism 5 is fixed to the upper horizontal portion of the frame 10 via a rotation mechanism mounting bracket 11. The bearing 8 is fixed to the frame 10 by a bearing mounting bracket 12. The details of the rotation mechanism 5, the rotation mechanism mounting bracket 11, the rotation mechanism mounting bracket 11 and the frame 10, and the fixing method between the bearing mounting bracket 12 and the frame 10 are not shown.

FIG. 2 is a cross-sectional view of the position indicated by A-A ′ in FIG. The winding shaft 2, the wire rod 3, the rotating mechanism 5, the rotating shaft 6, the bearing 8, the rotating mechanism mounting bracket 11, and the bearing mounting bracket 12 are inside the frame 10 having a U-shaped cross section shown in FIG. It is contained in.

The wire 3 is, for example, a flexible string or rope made of vegetable fiber or chemical fiber. Metal fibers may be used as long as they have flexibility that does not hinder winding. The winding shaft 2 is generally a round bar made of metal or plastic, but may be wood or the like if it has sufficient rigidity and strength.

The rotation mechanism 5 includes an electric motor, a speed reducer, and a brake. In FIG. 1, the electric wiring of the electric motor and the brake is omitted.

The electric motor is a direct current motor, and the winding speed can be adjusted by a voltage applied to the motor. Also, by changing the polarity of the voltage, the direction of rotation can be reversed and winding or lowering can be selected.

In order to control and drive the electric motor, there is a control device 20 shown in FIG. The control device 20 includes a drive circuit 200 and an operation panel 300. A winding speed / winding speed and a winding / stopping / lowering operation mode are set on the operation panel 300, and a voltage for driving the electric motor 21 is generated by the power supply circuit 201 which is a part of the driving circuit 200.

In FIG. 1, the winding shaft 2 and the rotating shaft 6 of the rotating mechanism 5 are arranged on a straight line, and the inclination angle of the straight line from the horizontal is θ.

In FIG. 1, when the rotating mechanism 5 rotates the winding shaft 2 counterclockwise while looking at the direction of the winding shaft 2 from the rotating mechanism 5, the wire 3 is wound according to the rotation of the winding shaft 2 and suspended. Roll up the load. At this time, the wire 3 forms a winding row, and the rows are arranged and aligned in the order of winding. As shown in FIG. 1B, the winding position advances in the direction in which the winding shaft 2 is inclined downward, that is, in the left direction of the screen.

On the contrary, it can be wound down by electrically reversing the rotation of the rotating shaft 6 of the rotating mechanism 5. At this time, the winding position advances toward the right side of the screen, which is the direction in which the winding shaft 2 is inclined upward.

The wire 3 is wound on the winding shaft 2 while drawing a spiral trajectory. If the transverse cross section of the wire 3 is assumed to be a perfect circle and is not deformed by winding, the wire 3 is wound on the winding shaft 2. One of the spiral lines formed on the surface of the winding shaft 2 by the line of contact between the wire 3 and the winding shaft 2 when being wound and developed by cutting the surface of the winding shaft 2 in the longitudinal direction of the shaft. The part is shown in FIG.

In FIG. 4, the horizontal axis is the longitudinal direction of the winding shaft 2, and the vertical axis is the circumference of a circle that is an intersection with a plane that intersects the winding shaft 2 perpendicularly. Here, the diameter of the wire 3 is R, the diameter of the winding shaft 2 is D, and the spiral inclination with respect to the wire 3 is α. Since the distance between the centers of adjacent wires is the diameter R of the wire 3, the helical pitch, which is the distance in the rotation axis direction, is represented by R / cos α. The distance of one round of the spiral is π · D. Therefore, the angle α of the helix is
tanα = (R / cosα) / (π · D)
∴ sinα = R / (π · D)
It can be expressed as

When the inclination of the winding shaft 2 from the horizontal is θ as shown in FIG. 3A, the wire 3 always faces in the vertical direction, so that the tangent to the wire 3 formed on the surface of the winding shaft 2 The angle formed by the spiral line and the plane perpendicular to the winding shaft 2 is also θ. Therefore,
θ = α
That is,
sinθ = sinα = R / (π · D)
At this time, as shown in FIG. 3A, adjacent rows of the wire rods 3 are arranged exactly densely. If [theta]> [alpha], there is a gap between adjacent rows of the wire 3 and the winding becomes loose.

Conditions that do not result in sparse winding
sinθ ≦ R / (π · D)
It is.
Therefore, in the method of winding the wire by tilting the shaft of the present invention from the horizontal, when the tilt of the shaft is too large, the spacing of the wire becomes sparse, and depending on the limitation of the shaft section available for winding in the axial direction, There are not enough windings.

Conversely, when θ <α, for example, the case where the winding shaft 2 is substantially horizontal (θ≈0) is shown in FIG. In this case, at the winding position of the wire 3, a force is applied to the wire 3 to be newly added to the row so as to get over the previous row that has already been wound and aligned.

If this force is so great that the wire rod 3 gets over the previous row, that is, turbulence occurs. That is, in the method of the present invention, when the axis inclination is too small, the wire rods on the already wound wire rod and overlaps with each other, resulting in multi-layer winding or random winding. Will be required.
However, the condition when the wire 3 gets over the previous row in this way is extremely complicated because of the tension, friction coefficient, cross-sectional shape, etc. of the wire.

However, in general, when a wire is wound, if there is a line that has already been wound, a phenomenon in which the wire moves over the previous line does not occur at least when θ is a positive value. I can say that.

This is because, in the limit state, when the diameter of the wire is zero, that is, R = 0, and at the same time the inclination angle of the shaft is zero, that is, θ = 0, the wire is wound at the same position at this time. It should be.

From this state, when the diameter R of the wire is slightly increased to a finite value of R≈0, whether the winding position advances to the right or left is determined by the initial value, and the possibility is 50% each.

At this time, if θ changes to a slightly positive value, the wire becomes
sinα = R / (π · D)
Α satisfying the following equation can be taken up in a spiral shape with a slope angle of the spiral. The winding position proceeds in a lower direction of the winding shaft.

In this thought experiment, in order for the wire 3 to be stably aligned and wound,
sinθ> 0
It turns out that it is necessary.
On the other hand, the conditions for tight alignment and sparse winding
sinθ ≦ R / (π · D)
I know that.

That is, if θ satisfies the following condition, it can be seen that the wires 3 may be stably aligned and wound tightly.

0 <sinθ ≦ R / (π · D)
Therefore, the following equation is obtained.

0 <θ ≦ sin ⁻¹ {R / (π · D)}

Within this range, if θ, that is, the inclination angle of the take-up shaft 2 is selected, there is a possibility that an orderly and dense spiral can be wound. Specifically specifying θ is extremely complicated due to the tension, friction coefficient, cross-sectional shape, etc. of the wire, but at least if θ = sin ⁻¹ {R / (π · D)} It can be achieved.
The gradient angle α of the spiral at this time is α = sin ⁻¹ {R / (π · D)}
It is.

In order to select and adjust the inclination angle of the shaft, the heights of the rotation mechanism mounting bracket 11 and the bearing mounting bracket 12 may be changed.

Alternatively, as a hinge structure in which the mounting angle of the rotating mechanism mounting bracket 11 and the bearing mounting bracket 12 is free, a screw hole for mounting either one of the brackets, for example, the rotating mechanism 5 of the rotating mechanism mounting bracket 11 is an elongated hole. . An appropriate position of the elongated hole is selected, and the rotation mechanism 5 may be attached and fixed.

Alternatively, a tilt attachment can be used as another method for selecting and adjusting the tilt angle of the shaft. This will be described with reference to FIG.

In FIG. 5, the winding device 1 stores components such as the rotating mechanism 5 and the winding shaft 2 inside the frame 10 as described above, but a straight line connecting the rotating shaft 6 and the winding shaft 2. Is not inclined with respect to the frame 10 and is parallel. In order to incline the winding shaft 2 from the horizontal, a trapezoidal inclination attachment 14 is used.

The inclined attachment 14 is placed between the frame 10 and the ceiling 15 and fixed between them. FIG. 5 does not show details of the fixing method.
According to this method, the same winding device in which the frame 10 and the winding shaft 2 are parallel even if the angle of the mounting location such as the ceiling and the beam is variously different by selecting the tilt attachment 14 having different tilt angles. The angle of the shaft can be adjusted to an appropriate angle using According to this method, there is an effect that it is not necessary to prepare several types of winding devices having a predetermined inclination angle.

Although the electric motor built in the rotation mechanism 5 is a DC motor, an AC motor, a stepping motor, or the like may be used. Choose the speed adjustment and reversal method suitable for each motor.

In FIG. 1, the length of the frame 10 is a length necessary for installing the components such as the rotation mechanism 5 and the take-up shaft 2 on the inner side and constructing the take-up device 1. The entire device excluding the frame 10 may be mounted in a long structural material such as a supporting beam. Specifically, a hole is made in a part of the lower surface of a long building material square pipe that constitutes a beam, etc., and a part such as a rotating mechanism is inserted into this square pipe from the inside. Secure to the top.

In this case, since there is a decrease in strength due to making a hole in a part of the lower surface of the square pipe or the like, the thickness and size of the material of the square pipe or the like is examined and made appropriate.

By doing so, it becomes a smart structure with no extra bulging portion, rather than further adding the frame of the hoisting device to the outside of the structural material.

With reference to FIG. 12, a winding device having a mechanism for stopping the winding operation when the winding torque is too small will be described.

In the winding device described in the first embodiment, it is assumed that a certain level of tension is applied to the wire 3. There is no problem if it is an application where the suspended load is always suspended, but in applications where there is a possibility of removing the suspended load, even if the suspended material is removed and no tension is applied to the wire rod 3, the hoisting or lowering operation is performed. May end up.

In such a case, there is a high possibility that the wire 3 is disturbed in alignment and causes troubles such as entanglement. In this embodiment, such a trouble can be avoided by the control device 20 shown in FIG.

That is, the control device 20 shown in FIG. 12 includes a drive circuit 200 and an operation panel 300. The drive circuit 200 includes a power supply circuit 201 and a current detection circuit 202 that follows the power supply circuit 201, and supplies a drive current to the electric motor 21.

An operation panel 300 shown in FIG. 12 includes a speed setting unit 301, an excessive torque setting unit 302, an excessive torque setting unit 303, and a winding / lowering / stop switching switch 304. Various setting signals are sent to the drive circuit 200. send.

The power supply circuit 201 is a variable voltage DC power supply, which converts a commercial AC power supply to DC, and sets a voltage corresponding to the motor speed set by the speed setter 301 by a winding / stop / down switching switch 304. Supply with polarity. When a “winding” or “winding” signal is set from the winding / stop / down switching switch 304, a voltage is generated. Further, when “stop” is set from the winding / stop / down switching switch 304 or when a stop signal is set from the current detection circuit 202, no voltage is generated.

The current detection circuit 202 includes a shunt resistor (not shown) and a comparison circuit, and separately detects a case where the current value is larger than the set current value and a case where the current value is smaller than the set current value. And issue a stop signal.

The electric motor 21 rotates at a speed determined by the voltage sent from the drive circuit 200 and in the rotation direction according to the polarity of the voltage.

When the hoisting device 1 is operated, the hoisting / lowering speed is set in the speed setting device 301 in advance, and the undertorque setting device 303 is slightly larger than the motor current when hoisting in a state where there is no suspended load. Set a current value sufficiently smaller than when there is a load.

Next, the winding / stop / down switching switch 304 is switched from “stop” to “wind up” or “down”. If there is a sufficiently heavy suspended load, the hoisting device 1 is normally operated.

If there is no sufficient weight of suspended load, the tension of the wire 3 is loose, the rotational torque of the winding shaft 2 becomes smaller than a preset value, and the current of the electric motor 21 is an under torque setting device. The value is smaller than the set value of 303. This state is immediately detected by the current detection circuit 202, a stop signal is generated, the motor drive voltage becomes zero, and the motor stops.

At this time, the electric motor 21 is automatically braked.

In this way, when the load is abnormal, such as when there is no suspended load, the operation is automatically stopped, and troubles such as tangling of the wire 3 can be prevented.

The electric motor 21 can be replaced with an AC motor or a stepping motor instead of a DC motor. When these motors are used, a power supply circuit and a torque detection circuit are selected according to the motor type.

The current detection circuit 202 can be replaced with a circuit using a Hall element instead of a shunt resistor. Also, signal setting, detection, and sequence control can be replaced by a digital method instead of an analog method.

Thus, a hoisting device having a mechanism for stopping the hoisting operation when the hoisting torque is too small can be realized.

With reference to FIG. 6, the winding device having a mechanism for detecting and stopping the winding completion position will be described. FIG. 6A shows a state in which the stop position detection blocks 16 a and 16 b attached to the wire rod 3 are lifted and abut against the frame 10 during winding.

FIG. 6B is a sketch of the stop position detection blocks 16a and 16b. As shown in FIG. 6B, the stop position detection blocks 16a and 16b are a combination of two divided cylinders, and the diameter of the cylinder is larger than the opening on the lower surface of the frame 10. It does not enter the inside of the frame 10.

Moreover, the groove | channel used as the hole through which the wire 3 passes is dug in the center. The wire 3 is passed through the groove, the screw 17 is passed through the two screw holes 19, and the nut 18 is tightened to integrate the stop position detecting blocks 16a and 16b. Since the screws 17 are tightened through the screws 17, the stop position detection blocks 16 a and 16 b are fixed on the wire 3 at the attached positions.

The stop position detecting blocks 16a and 16b may be made of any material having a certain rigidity such as wood, metal, plastic, or rubber.

As shown in FIG. 6 (a), when the stop position detection blocks 16a and 16b are lifted and come into contact with the frame 10 during winding, the stop position detection blocks 16a and 16b are fixed to the wire 3. Therefore, the winding is forcibly stopped, and the axis of the rotation mechanism 5 is also stopped in the same manner.

Since the shaft of the electric motor 21 is also forcibly stopped via the speed reducer, the motor current increases. On the contrary to the current detection circuit 202 described with reference to FIG. 12 in the second embodiment, if a current larger than the current when lifting a predetermined suspended load is set in the excessive torque setting unit 302, A current larger than the set value, that is, a torque is detected. At this time, similarly, a stop signal is sent to the power supply circuit 201, the motor voltage becomes zero, and the winding operation is stopped.

In addition to the method of detecting the motor current, for example, as shown in FIG. 6A, a limit switch 50 is installed at an appropriate position such as a side wall of the frame 10, and the stop position detecting block 16 is provided. The approach may be detected by the detection arm 51 and the circuit of the electric motor may be disconnected.

In this way, a winding device having a mechanism for detecting and stopping the winding position can be realized.

With reference to FIG. 7, FIG. 8, and FIG. 9, a winding device having a mechanism for detecting and stopping the winding completion position by a method different from that in the third embodiment will be described. FIG. 7 is a principle diagram of a winding completion position detecting mechanism using a limit switch. FIG. 7A is a side view, and FIG. 7B is a front view.

In the hoisting device shown in FIG. 7A, the point closer to the rotating mechanism 5, that is, the point at which winding starts on the left side of the screen and the point where the outer frame 30 and the limit switch 40 are installed are shown in FIG. Although it differs from the hoisting device shown, the basic configuration as the hoisting device has not changed. The frame 10 and the outer frame 30 are illustrated in a transparent manner so that the internal structure can be easily seen, and the frame 10 and the outer frame 30 are indicated by broken lines. The case 10 is fixed to the ceiling 15. Details of the fixing method are omitted.

FIG. 8 is a cross-sectional view taken along the line B-B ′ shown in FIG. FIG. 9 is a cross-sectional view taken along the line C-C ′ shown in FIG. As can be seen in FIG. 7B or FIG. 8 or FIG. 9, the outer frame 30 is composed of an outer frame 30a and an outer frame 30b that form two side surfaces, and between the outer frame 30a and the outer frame 30b. The connecting rod 31 is fixed with screws 32 and is tightened.

Further, as can be seen in FIG. 7A, the connecting rod 31 connects the outer frame 30 a and the outer frame 30 b at two locations before and after the outer frame 30. Thereby, the outer frame 30a and the outer frame 30b form an integral parallel wall, and the frame 10 is wrapped inside the wall.

Next, the frame 10 and the outer frame 30 are connected by screws 33 as can be seen in FIGS. 8 and 9. The screw 33 is self-supporting because the nut 34 and the nut 35 are firmly clamped across the wall of the frame 10. A distance slightly larger than the wall thickness of the outer frame 30 is provided between the bottom surface of the head of the screw 33 and the surface of the nut 34.

On the other hand, the hole through which the screw 33 of the outer frame 30 passes is slightly larger than the outer diameter of the screw portion of the screw 33 at the position indicated by BB ′ in FIG. The dimension is a long hole that is about twice the outer diameter of the screw portion of the screw 33, and is a circle slightly larger than the outer diameter of the screw portion of the screw 33 at the position indicated by CC ′ in FIG. It is a hole.

In this way, the frame 10 and the outer frame 30 have a total of four on the front side and the back side at the position indicated by BB ′ in FIG. 7 and on the front side and the back side at the position indicated by CC ′ in FIG. Although it is connected with a screw, it is not firmly connected. The outer frame 30 rotates in the vertical direction with respect to the frame 10 with the position of the screw 33b indicated by CC ′ in FIG. 7 as a fulcrum. be able to. The rotation range is determined by the length of the vertical portion of the long hole formed in the outer frame 30 at the position indicated by B-B ′ in FIG. 7.

When the frame 10 is attached to a ceiling or the like, the outer frame 30 is rotated by its own weight, and until the screw 33 hits the bottom of the long hole formed in the wall at the position indicated by BB ′ in FIG. The right outer frame 30 in FIG. 7 is lowered. When there is no hoisted load to be wound up or in a normal hoisting state, no force is applied to the outer frame 30 from the outside.

The limit switch 40 is fixed to the inside of the frame 10 as shown in the right side of the screen of FIG. 7A or FIG. Opposite the bottom plate. Since the contact inside limit switch 40 is inserted in series with the motor circuit, the electric motor stops when the contact opens. A detailed mounting method and wiring of the limit switch 40 are omitted.

The situation when the winding is advanced and the electric motor stops at the winding completion position will be described with reference to FIGS. 8 and 10. Fig.8 (a) has shown the middle of winding up the suspended load. The outer frame 30 is lowered by its own weight, and the upper side of the long hole 36 hits the screw 33 and stops.

When the stop position detection block 16 rises and hits the outer frame 30, the outer frame 30 is placed on the stop position detection block 16. As shown in FIG. 8B, the outer frame 30 is pushed up and approaches the position where the upper side of the elongated hole 36 hits the screw 33. In the meantime, the detection arm 401 of the limit switch 40 contacts the outer frame 30.

FIG. 10 shows a state in which the limit switch 40 operates as the outer frame 30 is pushed up by the stop position detection block 16 and rotates to move the right side of the outer frame 30 shown in FIG. is there. FIG. 10A shows a state where the outer frame 30 is lowered, and FIG. 10B shows a state where the outer frame 30 is raised. When the outer frame 30 is lowered, the detection arm 401 of the limit switch 40 is not touched.

When the outer frame 30 goes up, the detection arm 401 of the limit switch 40 is touched, the electrical contact inside the limit switch 40 is opened, the circuit of the electric motor is disconnected,
Stop the hoisting operation.

In this embodiment, since the entire outer frame 30 is integrally movable in the vertical direction and the outer frame 30 is interposed to transmit the movement of the stop position detecting block 16, the winding position is The end of winding can be detected at any position on the shaft 2.

Further, if the limit switch 40 is set in advance in accordance with the winding position at the end of winding, the stop position detection block 16 itself can be directly detected by the limit switch 40 without the outer frame 30. The end of winding can also be detected by contacting the arm 401.

In this way, a hoisting device having a mechanism for detecting the hoisting completion position and stopping the rotation of the shaft can be realized.

With reference to FIG. 11, a winding device that stops the rotation of the shaft when the winding position of the wire exceeds a predetermined position in winding / lowering the wire will be described.

FIG. 11 is a plan view showing the principle of the unwinding completion position detecting mechanism in the lowering operation. The cross sections drawn at the top and bottom of FIG. 11A show the vertical side surfaces of the frame 10. A winding shaft 2 is provided at the center position inside the frame 10, and the wire 3 is aligned around the winding shaft 2 and wound in a spiral shape.

Only the cross section of the wire 3 is shown for easy viewing of the drawing. Moreover, the cross section of the winding shaft 2 and the wire 3 is shown with a broken line for easy viewing of the drawing. In FIG. 11, only the cross section of the wire 3 extending in front of the vertical direction that is perpendicular to the screen at the winding position is indicated by solid oblique lines. When the winding shaft 2 rotates and the wire 3 is unwound, the winding position moves in the direction of the arrow shown in FIG.

A small limit switch 40 is fixed to the side surface of the frame 10. In FIG. 11, the details of the method of fixing the limit switch 40 are omitted. The vertical mounting position of the limit switch 40 is a position below the horizontal plane where the winding shaft 2 is located and facing a portion extending in front of the wire 3 in the vertical direction.

The limit switch 40 is a detection arm type, and is attached so that the detection arm 401 can rotate around the detection arm fulcrum 402. The limit switch 40 is supported by a position before being operated by the spring 404, and the detection arm 401 is subjected to a force from outside. When it is not applied, the operation plunger 403 is not pushed.

When the wire 3 is unwound, the wire 3 extending in the vertical direction from the winding position contacts the detection arm 401, and further unwinding proceeds, the tip of the detection arm 401 starts from the upper side of the screen of FIG. As shown in FIG. 11B, the detection arm 401 rotates clockwise around the fixed point 402 and pushes the operation plunger 403 to open an internal electrical contact (not shown). It has become.

The electrical contacts are connected in series to a wiring (not shown) connecting the power supply circuit 201 and the electric motor 21. Therefore, when the electric contact is opened, the voltage of the electric motor 21 disappears, the electric motor 21 stops, and the lowering operation is stopped.

If the mounting position of the limit switch 40 is moved and fixed in the longitudinal direction of the winding shaft 2, the position at which the lowering operation is stopped can be arbitrarily selected.

In this embodiment, the passage of the part extending in the vertical direction of the wire 3 at the winding position is detected by the contact method using the limit switch. Is possible.
Further, in this embodiment, the operation stop position detection in the lowering operation has been described, but it is added that it can be similarly applied to the operation stop position detection in the winding operation.

In this way, a winding device that stops the rotation of the shaft when the winding position of the wire exceeds a predetermined position can be realized.

DESCRIPTION OF SYMBOLS 1 Hoisting device 2 Shaft 3 Wire rod 4 Wire rod fixing point 5 Rotating mechanism 6 Rotating shaft 7 Connection component 8 Bearing 10 Frame 11 Rotating mechanism mounting bracket 12 Bearing mounting bracket 13 Hanging hook 14 Inclined attachment 15 Ceiling 16a, 16b Stop position detection block 17 Screw 18 Nut 19 Screw hole 20 Control device 21 Electric motor 200 Drive circuit 201 Power supply circuit 202 Current detection circuit 300 Operation panel 30 Outer frame 31 Connecting rod 32 Screw 33 Screw 34 Nut 35 Nut 36 Long hole 301 Speed setting device 302 Excess torque setting Unit 303 under torque setting unit 304 winding / lowering / stop switching switch 40 limit switch 401 detection arm 402 detection arm fulcrum 403 operation plunger 404 spring 50 limit switch 501 detection arm

Claims (6)

Wire rods for lifting suspended loads;
A shaft for winding the wire,
A bearing that supports the shaft,
A rotating device that rotates the shaft as a component;
Arranged so that the angle at which the pulling direction of the lifting wire intersects the direction of the axis deviates from a right angle,
Utilizing that the pulling direction of the wire always keeps an angle deviated from the right angle with respect to the direction of the bearing by gravity acting on the suspended load,
A winding device characterized in that the wire rods are aligned and wound up in a single layer.
The hoisting device according to claim 1,
The pulling direction of the lifting wire is vertical,
The hoisting device characterized in that the shaft is inclined from the horizontal.
The hoisting device according to claim 1,
When winding or unloading a suspended load,
When the rotational torque of the shaft is below a certain value or above a certain value,
A hoisting device that stops operation.
The hoisting device according to claim 1 or 2,
A fixed housing for mounting the bearing and the rotating device;
A block for detecting a stop position fixedly mounted at a location near the end on the side where the load of the wire is mounted;
When winding up the wire rod, the block hits the lower part of the fixed housing, the winding operation is interrupted and stopped, and when the rotational torque of the shaft becomes a certain value or more,
A hoisting device that stops operation.
The hoisting device according to claim 1 or 2,
A fixed housing for mounting the bearing and the rotating device;
A movable outer frame housing connected to the fixed housing by a hinge screw;
A supporting member for preventing free fall due to gravity of the movable outer frame housing at a specific portion of the stationary housing;
A mechanism for preventing free movement of the movable outer frame casing due to the presence of the support member on the movable outer frame casing;
A winding completion detection microswitch fixedly attached to the fixed housing and a stop position detection block fixed to the wire;
The fixed housing is firmly fixed to the building,
In a state where the wire is not wound up, the movable outer frame housing is positioned downward until it is supported by the support member by free fall, and the microswitch is in an on state,
The wire rod is wound up, hits the lower part of the movable outer frame casing, pushes up the movable outer frame casing, and simultaneously lifts up the members constituting the movable outer frame casing to turn off the micro switch. Winding device characterized by The hoisting device according to claim 1 or 2,
A fixed housing for mounting the bearing and the rotating device, a microswitch for detecting completion of winding or rewinding fixedly attached to the stationary housing, and a push button portion of the microswitch is pushed onto the microswitch housing. An obtuse L-shaped member movable in the direction,
By the winding or rewinding operation of the wire, the obtuse angle L member is pressed in the rewinding position advancing direction by moving the winding position,
By pushing the push button by the obtuse L-shaped member that is pressed,
By turning off the microswitch,
When the winding position of the wire exceeds a predetermined position,
A hoisting device that stops operation.