JPH052552Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a hoist with a slow speed mechanism that allows easy maintenance and inspection and balances the weight.

B. Summary of the invention This invention connects a brake shaft to the main motor via an intermediate shaft, and also connects a drum provided on the intermediate shaft to the brake shaft via a reducer. In a hoist with a slow speed mechanism that is equipped with a spring and a coil that move a support rotatably attached to a shaft toward and away from a brake wheel attached to the end of the brake shaft, the support and the brake wheel are pressed against each other. On the other hand, in order to separate the support body from the brake wheel, a coil is embedded in the bracket that covers the reducer, and the bracket forms an electromagnet that also serves as a yoke, thereby separating the brake from the drum. This eliminates the need to provide a yoke for burying the coil at the end of the shaft, thereby facilitating maintenance and inspection and making it possible to balance the weight of the hoist.

C. Prior Art A sectional view of a conventional hoist with a slow speed mechanism is shown in FIG.

A brake shaft 3 is connected to a first rotating shaft 1a of the main motor 1 via an intermediate shaft 2. A drum 4 is rotatably attached to the intermediate shaft 2, and a wire 5 for lifting cargo is wound around the drum 4 via a hook (not shown). This drum 4 is interlocked and connected to a gear 3a formed on the brake shaft 3 via a first reduction gear 6 of a planetary gear type. Two brake wheels 7 are engaged with a spline portion 3b formed at the end of the brake shaft 3, and a support 8, which rotates by being pressed against the brake wheels 7, is connected via a second reduction gear 9. It is connected to the second rotating shaft 10a of the slow motor 10. A brake 11 for braking the second rotating shaft 10a is integrally attached to the left side of the slow motor 10.

Next, the vicinity of the brake wheel 7, support body 8, etc. will be described in detail. A plurality of guide shafts 12 are attached to the support body 8 at equal intervals in the circumferential direction,
Brake disks 13 and 14 are provided slidably along the guide shaft 12. On the other hand, a yoke 16 etc. is attached to a bracket 15 that covers the brake wheel 7 etc. via a guide 19, and a coil 17 is embedded in the yoke 16.
A spring 18 is interposed between the yoke 16 and a spring receiver 13a rotatably provided on the brake disc 13.

A rail (not shown) attached to the ceiling is located on the center line A, and the hoist body is provided with two sets of wheels (not shown) that support the hoist body so that it can travel freely by sandwiching the rails.

Next, the operation of such a hoist with a slow speed mechanism will be explained.

When the first rotating shaft 1a of the main motor 1 is rotated,
The rotational motion is transmitted to the brake shaft 3 via the intermediate shaft 2, and from the gear 3a to the drum 4 via the first reduction gear 6.
It is transmitted to Therefore, the cargo suspended from the wire 5 can be raised and lowered. At this time, the coil 17 is energized so that the brake shaft 3 is not braked, and the brake disc 13 is attracted to the left in the figure against the biasing force of the spring 18, and the brake discs 13, 14 and the brake wheel 7 are Keep them apart.

On the other hand, when rotating the drum 4 at a slow speed, the excitation of the coil 17 is stopped and the second rotating shaft 10a of the slow speed motor 10 is rotated. Then, spring 1
The brake discs 13 and 14 are
The brake shaft 3 and the brake wheel 7 are pressed against each other, and the brake shaft 3 and the support body 8 are brought into a state where they rotate as one. Therefore, the rotational motion of the second rotating shaft 10a is transmitted to the brake shaft 3 via the second reducer 9 and the support 8, and further transmitted to the drum 4 via the second reducer 6.
The drum 4 rotates at a slow speed. At this time, the first rotating shaft 1a of the main motor 1 is allowed to rotate idly.

When the brake 11 is applied while the drum 4 is rotating at a slow speed, the rotation of the drum 4 is stopped.

D Problem that the invention attempts to solve However, the distance from the center line A is
Since the yoke 16 is located further away from the yoke 16 and the coil 17 is buried in the yoke 16, the yoke 16 must be removed during maintenance and inspection of the brake discs 13, 14 and the brake wheel 7, and the heavy yoke 16 The disadvantage is that the weight cannot be balanced because it is too far away from the wheels.

Therefore, an object of the present invention is to provide a hoist with a slow speed mechanism that eliminates such drawbacks.

E. Means for solving the problem In order to achieve the above object, the present invention is constructed as follows.

Conventionally, the coil for separating the brake wheel and brake disc was buried inside a yoke attached to the bracket via a guide rod, but in this invention, the yoke is omitted and the coil is buried directly in the bracket. By doing so, the bracket constitutes an electromagnet that also serves as a yoke.

F Function Since the coil is embedded in the bracket that also serves as a yoke, the guide rod and yoke are not required, and the brake wheel etc. can be easily inspected, making maintenance and inspection easy. Additionally, since a heavy yoke is not required, the weight of the hoist body can be balanced.

G Example Hereinafter, the present invention will be explained based on the example shown in FIG. It should be noted that this embodiment is a partial improvement of the conventional hoist with a slow speed mechanism, so the same parts are given the same reference numerals, explanations are omitted, and only the different parts will be explained.

In this embodiment, in order to make the weight of the left side in the drawing smaller than the drum 4, a spur gear type first reduction gear 20 is used instead of a planetary gear type first reduction gear.

A brake shaft 21 is connected to the intermediate shaft 2, and the vicinity of the end of the brake shaft 21 is structured as follows: A slider 23 is attached to the brake shaft 21 via a bearing 22 that is slidable in the axial direction, and a guide rod (not shown) that is integral with the slider 23 to prevent the slider 23 from rotating is inserted into a guide hole (not shown) formed in a bracket 24 parallel to the brake shaft 21. A spring 25 for biasing the slider 23 to the left in the figure is housed in a recess 28 formed in the bracket 24, and a support 8 is attached to the slider 23 via a bearing 26 and a seal 27 so as to be rotatable. The slider 23 on the bracket 24
A ring-shaped groove 29 is formed on the surface facing the
In the groove 29, a coil 17 is embedded to constitute an electromagnet that attracts the slider 23 together with the support 8 against the biasing force of the spring 25 and slides it to the right in the figure.
The bracket 24 is made of a material that functions as a yoke. The teeth 31 provided on the support 8 are engaged with a gear 30 of the second reduction gear 9.

The spring 25 pushes the slider 23 to the left to press the brake wheel 7 and the brake disc 14 against each other, and connects the brake shaft 21 and the support 8 to the slow motor 10 which is interlocked with the support 8.
This is for interlockingly connecting the second rotating shaft 10a of the second rotary shaft 10a. On the other hand, the coil 17 resists the biasing force of the spring 25 and attracts the slider 23 to the right, so that the brake wheel 7 and the brake disc 1
This is for separating the brake shaft 21 and the second rotation shaft 10a of the slow speed motor 10 from each other and, contrary to the above, disconnecting the brake shaft 21 and the second rotating shaft 10a of the slow motor 10.

Next, the operation of such a hoist with a slow speed mechanism will be explained.

When the coil 17 is not energized, the slider 23 slides together with the support 8 to the left in the figure due to the biasing force of the spring 25, and the support 8, the brake disc 14, and the two brake wheels 7 are moved together. The brake shaft 21 and the support body 8 are pressed against each other and rotate integrally. That is, rotational force is transmitted between the brake shaft 21 and the second rotating shaft 10a of the slow speed motor 10, and the drum 4 can be rotated by the slow speed motor 10.

On the other hand, when the coil 17 is excited, the slider 23 is attracted to the right in the figure against the biasing force of the spring 25, and the support body 8 and the brake disc 1
4. The brake wheels 7 are separated from each other. That is, the brake shaft 21 becomes free with respect to the support body 8, and no rotational force is transmitted between the brake shaft 21 and the second rotating shaft 10a of the second motor 10. Therefore, the drum 4 can be rotated by the main motor 1.

Since the functions other than those described above are the same as the conventional ones, the explanation will be omitted.

H. Effects of the invention As explained above, according to the invention, the coil is buried in the bracket and the bracket constitutes an electromagnet that also serves as a yoke, so there is no need to attach a heavy yoke, and as a result, there is no need to remove the yoke. This makes maintenance and inspection of brake wheels, etc. easier. Also, since the weight is reduced by the amount of the conventional yoke, the weight of the hoist can be balanced. Furthermore, since the bracket exposed to the outside air also serves as a yoke, the cooling efficiency of the coil embedded in the bracket is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a hoist with a slow speed mechanism according to the present invention, and FIG. 2 is a sectional view showing a conventional hoist with a slow speed mechanism. 1... Main motor, 1a... First rotating shaft, 2...
Intermediate shaft, 4...drum, 7...brake wheel,
8...Support, 9...Second reducer, 10...Low speed motor, 10a...Second rotating shaft, 11...Brake, 17...Coil, 20...First reducer, 21
... Brake shaft, 23 ... Slider, 24 ... Bracket, 25 ... Spring.

Claims (1)

[Claims for Utility Model Registration] An intermediate shaft is connected to the first rotating shaft of the main motor, a brake shaft is connected to the intermediate shaft, a drum is rotatably provided on the intermediate shaft, and the drum is connected to the first rotating shaft through the first reduction gear. A spring and a coil are provided which are interlocked and connected to the brake shaft and which connect and separate the brake wheel attached to the end of the brake shaft and the support body rotatably provided on the brake shaft. In a hoist with a slow speed mechanism, which is provided with a brake that brakes the second rotating shaft while interlockingly connecting a second rotating shaft of a slow speed motor via a speed reducer, While placing the spring,
The coil is embedded in a bracket that covers the first reduction gear so as to separate the support body and the brake wheel against the biasing force of the spring, and the bracket constitutes an electromagnet that also serves as a yoke. A hoist with a slow speed mechanism.