JPH1053385A - Disc brake for hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely detect the action of an electromagnet without impairing the operability of a turning handle. SOLUTION: A mounting plate 10A is inserted between the outer frame 1 of a hoist and an electromagnet 2. A limit switch 11A is secured to the front of the upper part of the mounting plate 10A. A hexagonal bolt 29A is threadably engaged from behind into the top of the armature 7A of a disc brake and held in place by a nut 31. When the armature 7A is attracted to the frame 2a by the electromagnet 2, the limit switch 11 is put into operation by the head of the hexagonal nut 29A to detect the action (that is, releasing the disc brake) of the armature 7A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake for a hoist incorporated in an elevator hoist.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view showing an outline of a conventional hoisting machine of a rope type elevator incorporating a disk brake for a hoisting machine, a car suspended from the hoisting machine, and a counterweight. FIG. 6 is a partial plan view of FIG.

[0005] In FIGS. 5 and 6, a machine beam 21 is provided on a floor 20 of a machine room 18 provided above an elevator shaft 19, and a hoisting machine 22 is provided on an upper surface of the machine beam 21. Is installed.

A driving motor 27 is attached to the hoisting machine 22 so as to protrude in a cantilever manner from the rear surface.
Is connected to an input shaft 3 of a reduction gear (not shown) via a coupling 27a. A non-exciting operation type disk brake 28, which will be described in detail later with reference to FIGS. 7 and 8, is mounted on the front side of the speed reducer.

In the hoist 22, a main sheave 23 is press-fitted into an end of an output shaft protruding from the speed reducer, and a plurality of main ropes 24 are wound around the main sheave 23. A car 25 is suspended from one end of the main rope 24, and a counterweight 26 is suspended from the other end of the main rope 24.

In the elevator constructed as described above, the motor 27 including the start and stop is controlled by the control panel for controlling the inverter power supply of a variable voltage variable frequency (not shown) installed in the machine room at the upper end of the hoistway 19. Controlled and balanced with basket 25 via main sheave 23 and main rope 24
26 moves up and down the hoistway 19.

FIG. 7 is an enlarged front view of the above-described disc brake 28, and FIG. 8 is a sectional view taken along the line BB of FIG. 7 and 8, a frame 2a of an electromagnet 2 made of lost wax is fixed to a front surface of an outer frame 1 of a hoisting machine 22 with a plurality of hexagon socket head bolts 32.

A coil 4 is buried inside the electromagnet 2, and a spring insertion hole 2b is formed inside the outer periphery of the electromagnet 2 as shown in FIG.
When viewed from the front of the, they are formed at 120 degree intervals. The rear ends of these spring insertion holes 2b are hexagonal. A hex bolt 13 for torque adjustment, which will be described later, is inserted from the front into these spring insertion holes 2b.
The compression coil spring 6 is loosely fitted to the screw 13, and the screw side of the hexagon bolt 13 projects from the front surface of the frame 2 a.

An annular disk plate 7B is provided on the front surface of the frame 2a. Bolt holes are formed in the outer periphery of the disk plate 7B at positions facing the spring insertion holes 2b of the frame 2a in FIG. As shown, bolts 13 protruding from the frame 2a pass through these bolt holes. The front surface of each of the above-described compression coil springs 6 is in contact with the back surface of the bolt hole of the disk 7B.

An end of an input shaft 3 of the speed reducer protrudes from the front surface of the outer frame 1, and a boss 5 having a spline formed on the outer periphery is press-fitted into the end of the input shaft 3 via a key 14. I have. The boss 5 is prevented from falling off by a C-shaped retaining ring (not shown) inserted at the tip of the input shaft 3.

A groove formed in the inner periphery of the annular friction plate 8 is loosely fitted in a spline portion on the outer periphery of the boss 5, and is movable only in the axial direction by the teeth of the spline formed on the outer periphery of the boss 5. It has become. On both sides of the outer periphery of the friction plate 8,
The sliding plate 8a is symmetrically joined.

An annular disk 9 is additionally provided on the front surface of the friction plate 8, and the back surface of the disk 9 is in contact with the front surface of the front slide plate 8a. Bolt holes are formed on the inner side of the outer periphery of the disk 9 at intervals of 120 degrees similarly to the disk 7, and the tips of the bolts 13 pass through these bolt holes.

A nut 31 is screwed to the tip of each bolt 13, and by tightening the nut 31, the disc 7B,
9 and the sliding plate 8a are tightened at a predetermined pressure by the return force of the compression coil spring 6.

In the disk 9, shaft holes 12a are provided at intervals of 120 degrees between bolt holes through which bolts 13 pass.
The front ends of the two screw studs 12 are fixed to the shaft holes 12a with nuts 11. The rear ends of the two screw studs 12 are formed in the frame 2a and screwed and fixed to the screw holes.

In the disk brake for a hoist constructed as described above, in order to set the brake torque to a predetermined value while keeping the installation length of the compression coil spring 6 constant, FIG.
The protrusion height between the front surface of the disk 9 and the tip of the bolt 13 is measured with calipers or the like.

After the elevator is installed, when the car is raised and lowered to perform an adjustment test on whether or not to stop at a predetermined deceleration and braking distance, the compression height is adjusted by adjusting the protrusion height of the bolt 13 described above. The tightening force of each of the disks 7B and 9 on the friction plate 8 by the coil spring 6 is adjusted.

On the other hand, when the coil 4 is excited, the disk 7B is attracted, and the back surface comes into close contact with the front surface of the frame 2a.
The compression coil spring 6 is formed by the sucked disk 7B.
Is compressed, and the tightened state of the discs 7 and 9 against the friction plate 8, that is, the brake operating state is released.

Therefore, while the car is moving up and down, the coil 4
Is in an excited state, the car is in a non-excited state when landing, and in the unlikely event of a power failure, the brake is activated and the car is stopped.

When manually raising and lowering the car at the time of adjustment of the installation test, the fitting portion at the center of the turning handle 32 shown in FIG. The input shaft 3
Is slowly rotated to drive the main sheave 23 and the main rope 24 shown in FIG.

In the disk brake for the hoist constructed as described above, the armature 7B surely returns to press the friction plate 8 by stopping the excitation of the coil 4, and it is determined whether or not the brake is activated. A switch for detection is incorporated.

[0021]

However, in the disk brake for the hoist constructed as described above, the operation detection switch of the electromagnet must be attached while avoiding attachment / detachment and operation of the turning handle. In addition to being restricted, there is a possibility that assembly and maintainability may be impaired.

An object of the present invention is to provide a disk brake for a hoist capable of easily and reliably detecting the operation of an electromagnet without impairing the operability of a turning handle.

[0023]

According to the first aspect of the present invention, there is provided an electromagnet which is inserted into a tip of an input shaft of a hoist and is fixed to an outer frame of the hoist, and an electromagnet provided in front of the electromagnet. In a disk brake for a hoist having an armature that operates by turning on and off, a switch is provided outside the electromagnet, and a pressing tool that turns on and off the switch by turning on and off the electromagnet is provided on the armature. I do.

A disk brake for a hoist according to a second aspect of the present invention is characterized in that a plurality of switches are provided, and the operation of the electromagnet is detected based on the AND condition of the switches.

A disk brake for a hoist according to a third aspect of the present invention is characterized in that a wear detection switch for detecting an increase in the operation stroke of the armature due to the brake disk worn to a preset value is added. I do.

Furthermore, the disk brake for a hoist according to the invention of claim 4 is characterized in that a stroke amplifying portion for amplifying the operation stroke of the armature by a lever is provided between the pressing tool and the switch.

According to the first aspect of the present invention, the switch and the pressing tool are incorporated in a small space formed above the disc brake.

According to the second aspect of the present invention,
In the event that the disk brake is in partial contact, it is detected by detecting it under the AND condition of the switch to prevent a reduction in the life due to partial wear and erroneous detection of operation.

According to the third aspect of the present invention,
The necessity of maintenance and inspection of the disc brake and the remaining life are grasped by the detection signal of the wear detection switch.

Further, in the invention according to the fourth aspect, adjustment of the gap between the switch and the pressing tool is easily performed by the lever having an increased stroke.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk brake for a hoist according to the present invention will be described below with reference to the drawings. FIG.
Is a front view showing a first embodiment of a disk brake for a hoist of the present invention, and corresponds to FIG.
FIG. 2 and FIG. 2 are cross-sectional views taken along line AA of FIG. 1 and also correspond to FIG.

FIGS. 1 and 2 are different from FIGS. 7 and 8 shown in the prior art in that a limit switch is provided on the upper part of the frame 2a of the electromagnet 2, and the operation of turning on and off the limit switch is performed. The other parts are the same as those in FIGS. 7 and 8 except that the part is fixed to the upper end of the armature.
Therefore, the same elements as those in FIGS. 7 and 8 are denoted by the same reference numerals, and description thereof will be omitted.

That is, between the outer frame 1 and the electromagnet 2 of the hoist, a mounting plate 10A having a U-shaped outer periphery in the front view of FIG. 1 is attached, and the mounting plate 10A is attached to the frame 2a. A bolt hole (not shown) is formed at a position corresponding to the tightening hole formed by the formed hexagon socket head cap screw 32.

Therefore, the frame 2a is attached via the mounting plate 10A provided between the frame 2a and the outer frame 1.
It is fixed to the outer frame 1 with hexagon socket head cap screws 32. Also,
A limit switch 11 is fixed on the upper side of the mounting plate 10A via a pair of small screws 30 on the right side when viewed from the front.

On the other hand, the armature 7A has an outer diameter larger than that of the armature 7B shown in FIG. 8 shown in the prior art, and a female screw hole is formed in a position facing the operation part of the limit switch 11. A hexagon bolt 29A is screwed into the female screw hole from the rear, and is fixed to the armature 7A with a nut 31 screwed from the front end.

The position of the rear surface of the head of the hex bolt 29A is such that the contact of the contact of the limit switch 11 starts at about 70% of the suction stroke of the armature 7A and the contact of the limit switch at 100% of the suction stroke. Loosen the nut 31 and adjust it so that it is about 90% of the wipe amount.

Therefore, the armature 7 shown in FIG.
At the position before the suction of N, the limit switch 11 is in the open state, the armature 7A is sucked, and the sliding plates 8a are closed with the entire front armature 7A and the plate 9 separated from each other.

In the disk brake for the hoist constructed as described above, the upper end can be accommodated below the upper end surface of the outer frame 1 of the hoist, as in the prior art. Since the amount of protrusion from the front is only the thickness of the mounting plate 10A, not only can the increase in occupied volume be minimized, but also the mounting and operation of the turning handle attached to and detached from the front side is the same as before. No problem.

Next, FIG. 3 is a front view showing a disk brake for a hoist according to a second embodiment of the present invention, which corresponds to FIG. 1 shown in the first embodiment and corresponds to claim 2. FIG. Note that the cross-sectional view of FIG. 3 corresponding to FIG. 2 has the same shape as FIG. 2 shown in the first embodiment, and thus is omitted.

FIG. 3 differs from FIG. 1 and FIG. 2 shown in the first embodiment in the number of limit switches, and the shape of the mounting plate attached to the back surface of the electromagnet 2 is correspondingly substantially corresponding thereto. 1 and 2
Is the same as

That is, the mounting plate 10B is provided with a substantially trapezoidal mounting portion 10a at a position corresponding to each of the hexagonal bolts 13 for torque adjustment arranged at intervals of 120 degrees.
A limit switch 11 is radially fixed with respect to a.

On the other hand, a hexagonal bolt 29A of the same product as the hexagonal bolt 29A shown in FIG. 1 and FIG. And is fixed to the armature 7A.

As described above, in the disk brake for the hoisting machine in which three limit switches 11 are symmetrically mounted, not only the contact reliability of the limit switches is improved, but also the operation of the three limit switches is controlled by an AND circuit. Contact with the sliding plate 8 due to an error during assembly, etc.
Partial contact of a can be detected, and erroneous detection of the operation of the electromagnet and partial acceleration of wear of the sliding plate due to the partial contact can be prevented.

FIG. 4A is a sectional view showing a third embodiment of a disk brake for a hoist according to the present invention.
FIG. 10 corresponds to FIG. 2 shown in the second embodiment and FIG. 3 shown in the second embodiment, and corresponds to claim 3.

Referring to FIG. 4A, the above-described FIGS.
3 differs from FIG. 3 in that a limit switch for detecting the degree of wear of the sliding plate 8a is added.
It is the same as FIG. Therefore, the same elements as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

That is, between the outer frame 1 and the electromagnet 2,
An inverted L-shaped mounting plate 10C is provided in place of the mounting plate 10A shown in FIG. At the front end of the mounting plate 10C, a limit switch 11B, which is the same product as the limit switch 11A, is fixed to the back side at a position corresponding to the limit switch 11A.

On the other hand, a pressing plate 15 is fixed via a nut 31 to the back side of the armature 7A on a bolt 29A penetrating the upper portion of the armature 7A, and the upper portion of the pressing plate 15 is connected to a limit switch 11B. And a predetermined gap.

That is, although the gap 4 is not in contact with the contact of the limit switch 11B when the coil 4 is in the non-excited state, the wear of the sliding plate 8a progresses, the operation amount of the armature 7A increases, and the sliding plate 8a Assembled to a size that will contact when the wear reaches an acceptable limit.

Therefore, in the disk brake for the hoist configured as described above, the limit switch 11B
By connecting these contacts to the maintenance circuit of the control panel, it is possible to detect a decrease in the braking force of the disc brake due to the progress of wear of the sliding plate 8a.

Further, the gap between the limit switch 11B and the pressing plate 15 is further narrowed slightly, and the number of days required for wear from when the limit switch 11B is operated to when the limit switch 11B is reached is checked by regular inspection of the elevator. By setting the interval, it is possible to grasp that the wear plate 8 needs to be replaced on the next inspection day, and this can be reflected in a maintenance inspection work plan.

In the embodiment shown in FIG. 4 (a), similarly to the disk brake for the hoist shown in FIG. 3 of the second embodiment, the place opposite to each compression coil spring 6 is provided. In contrast, by providing the limit switch 11A and further opposing the limit switch 11B and the pressing plate 15, the wear of the sliding plate 8a can be detected over the entire surface, and the detection accuracy is improved. It is also possible to increase the reliability of the braking force of the hoist disk brake.

Next, FIG. 4B is a sectional view showing a fourth embodiment of a disk brake for a hoist according to the present invention.
FIG. 9 is a diagram corresponding to FIG. 2A shown in the third embodiment and FIG. 4A shown in the third embodiment, and corresponding to claim 4.

FIG. 4B differs from FIGS. 2 and 4A described above in that the stroke of the pressing portion for operating the limit switch is increased to facilitate the adjustment work at the time of assembly. Others are the same as FIG. 2 and FIG.

That is, a small-sized compression coil spring 17 is provided at a position facing the head of the hexagon bolt 29A, and the rear end is fixed to the mounting plate 10A. This compression coil spring 17
A support 20 is erected on the upper part of the lever 16, and an intermediate slightly lower side of the lever 16 is connected to a front end of the support 20 via a pin.

A limit switch 11C is provided above the support 20.
Is fixed to the mounting plate 10A. The upper end of the lever 16 contacts the front end of the operating portion of the limit switch 11C, and the lower end of the lever 16 contacts the head of the hexagon bolt 29.

In the disk brake for the hoist constructed as described above, the operating stroke of the hexagon bolt 29A fixed to the upper end of the armature 7A is increased by the lever ratio of the lever 16, so that the limit switch 11C is turned on and off. , And the accuracy of detecting the operation of the armature 7A can be improved.

Also in this case, as shown in FIG. 3, by arranging three limit switches at 120-degree intervals, the detection accuracy can be further improved.

[0058]

As described above, according to the first aspect of the present invention,
In a disk brake for a hoist equipped with an armature that operates by turning on and off the electromagnet, in front of an electromagnet inserted into the tip of the input shaft of the hoist and fixed to the outer frame of the hoist, Provide a switch on the outside to
By providing the armature with a pressing tool that turns the switch on and off by turning off, the switch and the pressing tool were incorporated in the slight space formed above the disc brake,
A disk brake for a hoist that can easily and reliably detect the operation of the electromagnet without impairing the operation of the turning handle can be obtained.

According to the second aspect of the present invention, a plurality of switches are provided, and the operation of the electromagnet is detected based on the AND condition of the switches. Is detected by detecting under the AND condition of the switch to prevent the shortening of the life due to partial wear and the erroneous detection of the operation, so that the operation of the electromagnet can be easily and reliably performed without impairing the operation of the turning handle. Can be detected, and a disk brake for a hoisting machine which can increase the reliability of the brake can be obtained.

According to the third aspect of the present invention, a maintenance / inspection of the disk brake is provided by adding a wear detection switch for detecting an increase in the operation stroke of the armature due to the worn brake disk to a preset value. To obtain a disc brake for a hoisting machine that can easily and reliably detect the operation of the electromagnet without impairing the operation of the turning handle because the necessity and remaining life can be grasped by the detection signal of the wear detection switch. Can be.

Further, according to the fourth aspect of the present invention,
By providing a stroke amplifying unit that amplifies the operation stroke of the armature by the lever between the pressing tool and the switch, the gap between the switch and the pressing tool can be easily adjusted by the lever with the increased stroke. A disk brake for a hoist that can easily and reliably detect the operation of the electromagnet without impairing the operation of the turning handle can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of a disk brake for a hoist according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a second embodiment of the disk brake for the hoist of the present invention.

FIG. 4A is a sectional view showing a third embodiment of the disk brake for a hoist according to the present invention. (B) is sectional drawing which shows 4th Embodiment of the disc brake for hoists of this invention.

FIG. 5 is a diagram showing a conventional hoist in which a disk brake for a hoist is incorporated, and a car and a counterweight driven by the hoist.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a partially enlarged detailed view of FIG. 5;

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is an explanatory view showing the operation of a conventional disk brake for a hoist.

[Explanation of symbols]

1 ... outer frame, 2 ... electromagnet, 2a ... frame, 3 ... input shaft,
4 coil, 5 boss, 6, 17 compression coil spring, 7
A, 7B: Armature, 8: Friction plate, 8a, 8b: Sliding plate, 9: Disk, 10A, 10B: Mounting plate, 11A, 11B
... Limit switch, 12 ... Double screw stud, 13 ... Hex bolt, 14 ... Key, 15 ... Pressing plate, 16 ... Lever, 18 ... Machine room, 19 ... Hoistway, 20 ... Support, 21 ... Machine beam, 22 ... Upper machine, 23… Main sheave, 24… Main rope, 25… Cage, 26… Balance weight, 27… Electric motor, 28… Disc brake, 29
A, 29B: Hex bolt, 30: Small screw, 31: Nut.

Claims (4)

[Claims] 1. An electromagnet which is inserted into a tip of an input shaft of a hoist and is fixed to an outer frame of the hoist, and an armature provided in front of the electromagnet and operated by turning on / off the electromagnet. A disc brake for a hoist, wherein a switch is provided outside the electromagnet, and a pressing tool for turning on / off the switch by turning on / off the electromagnet is provided on the armature. . 2. The disk brake for a hoist according to claim 1, wherein a plurality of the switches are provided, and an operation of the electromagnet is detected based on an AND condition of the switches. 3. The hoist according to claim 1, further comprising a wear detection switch for detecting an increase in the operation stroke of the armature due to the brake disk worn to a preset value. For disc brakes. 4. A hoist according to claim 1, wherein a stroke amplifying unit for amplifying an operation stroke of the armature by a lever is provided between the pressing tool and the switch. Disc brake for machine.