JPH07213015A - Winch driven by rotating field synchronous motor - Google Patents

Abstract

PURPOSE:To assemble and disassemble a winch driven by a rotating field synchronous motor without damaging a permanent magnet rotating field pole by a method wherein jack bolts screwed into tapped holes so as to facilitate the adjustment of the distance between the motor and the inner wall surface of a winch drum are provided. CONSTITUTION:In order to disassemble a winch driven by a rotating field synchronous motor, a pair of support rods 6 are lifted and, in that state, the support rods 6 are cut off from support stands 7 and the outer circumference of a winch drum 8 is supported above a base. Then jack bolts 12 are adjusted while bearing shields divided into a plurality of sections are partially removed to set a gap (g) between the inner wall surface of the winch drum 8 and the motor at a certain value smaller than a gap width G between the stator and the permanent magnet rotary field pole of the motor. Then the pair of support rods 6 are lifted up a little by a crane and the remaining sections of the bearing shields are removed and the support rods 6 are shifted to draw out the stator 3. As a result, even if the position of the stator 3 is displaced, the tips of the jack bolts touch the inner wall surface of the winch drum before the stator touches the pole, so that damages can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary field type synchronous motor drive in which a drive motor and a hoisting drum are integrated in a hoisting machine for a coal mine vehicle, a hoisting machine for building elevators, and the like. Regarding hoisting machine.

[0002]

2. Description of the Related Art In a coal mine, for example, a hoisting machine is used for hoisting a coal-loaded mining car from a slant shaft with a wire wound around a drum and unwinding an empty mining car into the tunnel. Conventionally, a DC motor capable of speed control was used as a drive device for a coal mine hoist, but with the technical progress of the inverter as a variable frequency static power supply, the speed control by the inverter was performed. A rotary field type synchronous motor drive hoist driven directly by a rotary field type synchronous motor has been proposed.

FIG. 5 is a sectional view schematically showing a rotary field type synchronous motor drive hoisting machine already proposed by the applicant of the present application. A pair of support bases 7 having parallel planes facing each other are predetermined. The pair of support bars 6 are fixed to the foundation with a space therebetween, and are concentrically opposed to each other from the parallel surfaces of the pair of support bases 7.
And a hoisting drum 8 is rotatably supported by the support rod 6 via a bearing 5 and a bearing shield 4. Further, the permanent magnet rotating field type synchronous motor 1 as a driving electric motor includes a stator 3 supported concentrically with the hoisting drum 8 between a pair of support rods 6, and a hoisting device surrounding the stator 3. The permanent magnet rotating field magnetic pole 2 as a rotor is fixed to the inner wall surface of the drum 8 while maintaining a gap length G between the drum 8 and the stator.

The stator 3 comprises a stator core 3B and a stator coil 3A wound around a slot of the stator core 3B. When operating the hoist, an inverter (not shown) fixes a variable frequency, for example, three-phase AC power. A torque is generated in the permanent magnet rotating field pole 2 by supplying it to the child winding 3A to generate a rotating magnetic field corresponding to the frequency, and the hoisting drum 8 supporting this torque is proportional to the rotating magnetic field, It is driven at a synchronous speed that is inversely proportional to the number of magnetic poles.

[0005]

DISCLOSURE OF THE INVENTION In a conventional rotary field type synchronous motor drive hoisting machine in which a rotating portion and a fixed portion are commonly supported by a pair of support rods, the pair of supporting rods 6 is disassembled when disassembled. Separated from the stand 7 and hoisting drum 8 on a stand prepared separately.
The bearing shield 4 is removed while the outer peripheral side of the bearing is supported and the pair of support rods is slightly lifted by the crane to maintain the gap length G between the stator 3 and the permanent magnet rotating field pole 2. In this state, the support rod 6 is moved in the axial direction to pull out the stator 3 from the permanent magnet rotating field pole 2.
However, since the pulling-out work is performed in a state where the gap length G is small and the attraction force of the permanent magnet is applied, the stator 3 hung by the crane is rotated or shakes vertically to rotate the permanent magnet. It is difficult to avoid being attracted to and contacting the field pole 2, and this causes a problem of damaging the permanent magnet rotating field pole. Also, the same problem occurs during the assembly work.

An object of the present invention is to provide a rotary field type synchronous motor driven hoisting machine which can be easily assembled and disassembled without damaging the permanent magnet rotary field magnetic poles.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a pair of support bases having parallel planes facing each other and a pair of support bases concentrically opposed from the parallel planes. And a pair of support rods that are detachably provided, a hoisting drum rotatably supported by the support rods via a bearing and a bearing shield, and the hoisting drum between the pair of support rods. A permanent magnet rotating field composed of a stator supported concentrically, and a permanent magnet rotating field magnetic pole supported on the inner wall surface of the winding drum surrounding the stator with a gap maintained between the stator and the stator. In the one provided with a magnetic synchronous motor, a disk-shaped support ring supported slidably in the axial direction by the pair of support bars, and a predetermined depth radially from the outer peripheral side of the support ring. A plurality of female screw holes formed,
It is assumed that the female screw hole is provided with means for preventing damage to the permanent magnet rotating field magnetic pole, which is composed of a jack bolt screwed so as to be adjustable in distance from the inner wall surface of the winding drum.

The support ring of the permanent magnet rotating field magnetic pole damage preventive means is provided with a handhole whose inner threaded hole is deeply opened, and a jack bolt is wound into the female threaded hole from the side of this handhole to form the inner wall surface of the winding drum. It shall be screwed so that the distance to and can be adjusted. The distance adjustment range between the end surface of the jack bolt and the inner wall of the hoisting drum is larger than the distance between the rotor and the hoisting drum during steady state, and between the permanent magnet rotating field pole and the rotor during assembly or disassembly. It is assumed that the range is shorter than the gap length.

[0009]

According to the present invention, a disk-shaped support ring slidably supported by a pair of support rods in the axial direction thereof, and a plurality of radial support radially extending from the outer peripheral side of the support ring. By providing a means for preventing damage to the permanent magnet rotating field magnetic poles, which comprises a female screw hole and a jack bolt screwed into the female screw hole so that the distance between the female screw hole and the inner wall surface of the winding drum can be adjusted, the rotating field type When the rotor is displaced by the attraction force of the permanent magnet during assembly and disassembly of the synchronous motor driven hoist, the tip of the jack bolt of the damage prevention means is attached to the hoist drum before the rotor comes into contact with the permanent magnet rotating field magnetic pole. By adjusting the distance of the jack bolt screwed into the female screw hole of the support ring in advance so that it abuts the inner wall surface of the support ring, the permanent magnet rotating field magnetic pole and the rotor attract the magnetic attraction force of the permanent magnet. Thus the ability to prevent the contact is obtained, inserting or work safely and easily perform functions to extract the rotor inside the permanent magnet rotating field magnetic pole without damaging the permanent magnet rotating field magnetic pole is obtained.

Further, the supporting ring of the damage preventing means of the permanent magnet rotating field magnetic pole is provided with a hand hole having a deep part of the female screw hole opened, and a jack bolt is wound from the hand hole side to the female screw hole of the hoisting drum. If the screw is constructed so that the distance to the inner wall surface can be adjusted, it will be easier to adjust the jack bolt in a narrow hoisting drum, and the gap length between the tip of the jack bolt and the inner wall surface of the hoisting drum will be accurate. The ability to adjust is obtained.

Further, the distance adjusting range between the end surface of the jack bolt and the inner wall surface of the hoisting drum is larger than the distance between the rotor and the hoisting drum in the steady state, and is set to the permanent magnet rotating field magnetic pole when assembling or disassembling. By setting it to a range shorter than the gap length between the rotors, it is not possible to move the jack bolt away from the permanent magnet rotating field pole and the hoisting drum at a steady time when no measure is required to prevent damage to the permanent magnet rotating field pole. In the assembly and disassembly of the permanent magnet rotating field pole to prevent contact accidents, the tip of the jack bolt must be inside the hoisting drum faster than the rotor contacts the permanent magnet rotating field pole. A function of contacting the wall surface and avoiding damage due to contact between the permanent magnet rotating field magnetic pole and the rotor is obtained.

[0012]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a sectional view schematically showing a rotary field type synchronous motor driven hoisting machine according to an embodiment of the present invention, and FIG. 2 shows a main part of the rotary field type synchronous motor driving hoisting machine according to the embodiment. It is an enlarged cross-sectional view, and the same components as those of the conventional technique are denoted by the same reference numerals, and the duplicate description will be omitted. In the figure, a permanent magnet rotating field type synchronous motor 1 having a permanent magnet rotating field magnetic pole 2 on the outside of a stator 3 is used as a drive motor, and the stator 3 having a stator coil 3A is a pair of support rods. The permanent magnet rotating field magnetic pole 2 is provided between the six magnets 6 and is fixed to the inner wall surface of the winding drum 8 while maintaining the gap length G on the outer peripheral side thereof. The lifting drum 8 is rotatably supported by a support rod 6 via a bearing 5 and a bearing shield 4. Further, the damage preventing means 10 for the permanent magnet rotating field pole 2 is composed of a plurality of disc-shaped support rings 1 supported by a pair of support rods 6 so as to be slidable in the axial direction thereof.
1, a plurality of female screw holes 13 radially formed at a predetermined depth from the outer peripheral side of the support ring, and a jack bolt 12 screwed into the female screw holes so that the distance between the female screw holes 13 and the inner wall surface of the winding drum 8 can be adjusted. The gap length g between the tip of the jack bolt 12 and the inner wall surface of the hoisting drum 8 is set to be larger than the distance D between the stator 3 and the hoisting drum 8 in a steady state. In addition to avoiding accidental contact accidents, it is set to a range shorter than the gap length G between the permanent magnet rotating field pole 2 and the stator 3 during assembly or disassembly, and even if the position of the stator changes due to the magnetic attraction force. , The tip of the jack bolt 12 comes into contact with the inner wall surface of the winding drum 8 sooner than the stator comes into contact with the permanent magnet rotating field magnetic pole, and the stator 3
Is configured to avoid damage caused to the permanent magnet rotating field pole 2 by contacting the permanent magnet rotating field pole 2.

In a disassembling operation of a rotary field type synchronous motor drive hoist equipped with the permanent magnet rotating field magnetic pole damage preventing means 10 thus constructed, a pair of support rods 6 are suspended by cranes. In this state, it is separated from the support base 7, the outer peripheral side of the hoisting drum 8 is supported on a separately prepared pedestal, and a part of the bearing shield divided in the circumferential direction is partially removed. The screwing depth is adjusted to set the gap length g with the inner wall surface of the winding drum 8 to a constant dimension smaller than the gap length G between the stator and the permanent magnet rotating field pole, and then, for example, the pair of support rods 6 The support rod is slightly lifted by the crane using a long hoisting jig or the like that penetrates the hollow part of the bearing, the remaining bearing shield is removed while maintaining the gap length G, and the support rod 6 is gradually moved to its axis. Of the stator 3 When the punching work is performed, even if the stator 3 is displaced by the magnetic attraction force and the gap length G between the permanent magnet rotating field magnetic pole 2 is locally narrowed, the stator 3 still rotates the permanent magnet rotating field. Since the tip of the jack bolt 12 comes into contact with the inner wall surface of the winding drum 8 sooner than the contact with the magnetic pole 2, contact between the permanent magnet rotating field magnetic pole 2 and the rotor 3 can be avoided.
The work of pulling out the stator 3 can be safely and easily carried out without damaging the permanent magnet rotating field magnetic pole 2.
The same operation and effect can be obtained by assembling the stator in the reverse order of the above procedure during the assembling work of the rotary field type synchronous motor drive hoist.

FIG. 3 is a sectional view schematically showing a rotary field type synchronous motor drive hoisting machine according to another embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 3 viewed from a different direction, and the permanent magnet rotating field magnetic pole damage preventing means 20 has a female screw hole 13 formed radially from the outer peripheral side of the supporting ring 21. A hand hole 23 having an opening at the back is provided, and the jack bolt 22 screwed into the female screw hole 13 from the hand hole 23 side adjusts the distance g between the inner wall surface of the winding drum 8 and the tip of the jack bolt 22. It is different from the above-mentioned embodiment in that it is configured to do so.

In the rotary field type synchronous motor drive hoist equipped with the damage preventing means 20 constructed as described above, the adjustment work of the jack bolt 22 in the narrow hoisting drum 8 is performed in the assembling and disassembling work thereof. Since the adjustment work can be facilitated by using the expanded work space by performing it through the handwheel 23, the gap length g between the tip of the jack bolt 22 and the inner wall surface of the winding drum 8 is increased. Can be adjusted with high precision.

If a jack nut 12 or 22 is provided with a lock nut (not shown) so as to maintain the gap length g, the jack bolt is moved by the vibration accompanying the rotation of the hoisting drum 8 and comes into contact with the hoisting drum. The advantage of being able to surely avoid accidental contact accidents such as accidents is obtained.

[0017]

As described above, the present invention uses the permanent magnet rotating field type synchronous motor having the permanent magnet rotating field magnetic poles on the outer side of the stator as the driving electric motor to directly drive the winding drum. A magnetic synchronous motor drive hoist is provided with a means for preventing damage to the permanent magnet rotating field magnetic poles, and the gap length between the tip of the jack bolt and the hoisting drum is set to, for example, the stator when assembling and extracting the stator. The gap length between the permanent magnet and the rotating field magnetic pole is adjusted to be narrower than the gap length. As a result, even if the position of the stator changes due to the magnetic attraction force of the permanent magnet rotating field magnetic pole during the assembly and extraction work of the stator, the tip of the jack bolt does not come into contact with the permanent magnet rotating field magnetic pole. Comes into contact with the inner wall surface of the hoisting drum, and the stator is brought into contact with the permanent magnet, so that it is possible to avoid the damage that has been conventionally caused in the permanent magnet rotating field pole. Further, if the damage prevention means is constructed so that the supporting ring is provided with the handwheel, the adjustment work space of the jack bolt can be widened to facilitate the adjustment work, and the adjustment accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a rotary field type synchronous motor drive hoisting machine according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of a rotary field type synchronous motor drive hoisting machine according to an embodiment.

FIG. 3 is a sectional view schematically showing a rotary field type synchronous motor drive hoisting machine according to another embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 3 viewed from a different direction.

FIG. 5 is a cross-sectional view schematically showing a rotating field type synchronous motor driven hoisting machine that has already been proposed.

[Explanation of symbols]

 1 Permanent Magnet Rotating Field Type Synchronous Motor 2 Permanent Magnet Rotating Field Magnetic Pole 3 Stator 3A Stator Coil 3B Stator Iron Core 4 Bearing Shield 5 Bearing 6 Support Rod 7 Support 8 Lifting Drum 9 Wire-10 Permanent Magnet Rotation field magnetic pole damage prevention means 11 Support ring 12 Jack bolt 13 Female screw hole 20 Permanent magnet Rotation field magnetic pole damage prevention means 21 Support ring 22 Jack bolt 23 Handwheel

Claims (3)

[Claims] 1. A pair of support pedestals having parallel surfaces facing each other, a pair of support rods concentrically opposed from the parallel planes of the pair of support pedestals and detachably mounted, and the support rods. A hoisting drum rotatably supported via a bearing and a bearing shield, a stator concentrically supported by the hoisting drum between the pair of support rods, and the winding surrounding the stator. A permanent magnet rotating field type synchronous motor comprising a permanent magnet rotating field magnetic pole supported on the inner wall surface of a lifting drum with a gap maintained between the stator and the pair of support bars. A disk-shaped support ring slidably supported in the axial direction, a plurality of female screw holes radially formed from the outer peripheral side of the support ring to a predetermined depth, and the female screw holes of the winding drum in the female screw holes. Jack bolt screwed in so that the distance to the inner wall surface can be adjusted Rotation field type synchronous motor drive winch which characterized by including damage prevention means of the permanent magnet rotating field magnetic pole consisting of a. 2. A support ring for preventing damage to a permanent magnet rotating field magnetic pole is provided with a hand hole having a deep part of the female screw hole opened, and a jack bolt is wound from the hand hole side to the female screw hole of the drum. The rotary field type synchronous motor drive hoisting machine according to claim 1, wherein the hoisting machine is screwed so that the distance to the inner wall surface can be adjusted. 3. A range in which the distance between the end surface of the jack bolt and the inner wall surface of the hoisting drum is adjusted to be larger than the distance between the rotor and the hoisting drum in a steady state, and a permanent magnet rotating field magnetic pole during assembly or disassembly. 2. The rotating field type synchronous motor driven hoisting machine according to claim 1, wherein the gap is shorter than the gap between the rotor and the rotor.