JPS63715Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hoist, and is particularly suitable for reducing drive noise, machine drive transmission/rotation noise, and even brake noise, and preventing the influence of noise on the surrounding area during work such as construction work. It concerns a hoist.

Conventionally, hoists used during construction work, etc., have a wire winding drum A as shown in Figure 1.
and a drive device B disposed on the right side in the axial direction.
, a reduction gear C disposed on the left side in the axial direction, and a brake device D disposed at the end of the drive device B.
and an emergency brake device E disposed at the end of the speed reduction device C. The hoist is activated by transmitting the rotational force from the drive device B from the motor shaft 1 through the intermediate shaft 2 passing through the wire winding drum A to the gear shaft 3 of the reduction gear C, where it is decelerated and moves the spacer 4. The drum body 5 is rotated through the drum body 5. The normal brake when stopping and holding the load is the pressure plate 6 of the brake device D.
An electromagnetic brake plate 7 rotates together with the motor shaft 1.
In addition, in the event of an emergency such as when the brake device D fails and the load accelerates, the pressure plate 8 is pressed against the brake ring 9 to brake and stop the load. .

In such a hoist, since the wire winding drum A is driven by a single drive device B, a large load is applied at startup, which generates a loud startup noise, and the hoisting speed at this time is There are problems such as fast speed. In addition, this drive device B
The driving force from the wire winding drum A is transmitted through the intermediate shaft 2 passing through the wire winding drum A to the reduction gear C disposed on the opposite side, so its structure is complicated and the power transmission and rotation noise of the machine are reduced. Furthermore, since the brake device D used to stop and hold the load is simply attached to the end of the drive device B, it has a soundproofing function for the brake noise generated during braking. Not yet.

Therefore, various types of noise are generated when the hoist is used, and when it is used in construction work, etc., it has a large impact on the surrounding area, causing environmental deterioration, and countermeasures are required. was.

The present invention was developed against the background of the above circumstances, and includes a drive device that drives the wire winding drum via a reduction gear device, which is disposed on both sides of the wire winding drum in the axial direction. The brake device disposed in the section is surrounded by a brake cover device consisting of an inner cover and an outer cover, each of which is disposed with a predetermined space between them.

The purpose of this invention is to reduce the load per drum by using a pair of drive devices installed on both sides of the wire winding drum in the axial direction, and to reduce startup noise by utilizing the time lag during startup. By slowing down the hoisting speed during start-up, it contributes to start-up safety, and the brake device is surrounded by a specially constructed double brake cover device, which prevents brake noise from leaking outside. Moreover, it is an object of the present invention to provide a hoist which has a simple power transmission mechanism from a drive device and which can also reduce operating noise such as power transmission and rotation.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

As shown in FIG. 2, the hoist 11 drives the wire winding drum A through the reduction gears C and C disposed on both sides of the wire winding drum A in the axial direction. Drive device B, B
, and double-walled brake cover devices F, which are disposed on the end faces of the drive devices B, B and surround a brake device D (not shown). The hoist 11 is obstructed by the traveling beam 13 via the traveling devices 12, 12, and the hoist 1
A hook block 15 is suspended from the wire 14, which has one end fixed to the wire winding drum A, and which loads a load midway through the wire 14 wound around the wire winding drum A.

The structure of this hoist 11 will be explained in detail based on FIG. 3. The wire winding drum A includes a drum case 17 to which an output shaft bearing case 16 is fixed,
The drum main body 19 is arranged within the drum case 17 and fixed to an output shaft 18. The drive device B includes a stator frame 20, a stator core 21, a rotor 22, and a motor shaft 23, and the motor shaft 23 is directly connected to a first pinion gear 24 of the reduction gear C. As this drive device B, an elevator motor is used.
The speed reduction device C includes a first pinion gear 24, a first planetary gear 25, a first gear gauge 26, and a second planetary gear 2.
7 and an output shaft 18. The brake device D is composed of an electromagnetic brake plate 28 fixed to the end of the motor shaft 23 and a pressure plate 29.

The brake cover device F is composed of an inner cover 30 and an outer cover 31, which are arranged with a predetermined space between them. This predetermined space is set so that the inner cover 30 and the outer cover 31 do not resonate due to brake noise. The inner cover 30 has a double structure, and the outer layer 30a is made of a metal material such as casting, and the inner layer 30b is made of a soundproof material such as asbestos. Further, although the outer cover 31 is molded from synthetic resin in this embodiment, it may be molded from metal such as aluminum, and the flange portion 31a of the outer cover 31 is attached to the end face of the drive device B in a sealed manner. ing.

Next, the operation of this embodiment will be explained. First, when a start switch is turned on to operate the drive device B, the rotor 22 rotates, and this rotational force is transmitted from the motor shaft 23 to the first pinion gear 24. This rotational force is then reduced in speed and transmitted to the output shaft 18 via the first planetary gear 25, first gear gauge 26, and second planetary gear 27, thereby rotating the drum body 19.

In the initial stage of startup, since the drive device B is disposed on both the left and right sides of the wire winding drum A in the axial direction via the reduction gear device C, a startup time lag occurs. Due to this time lag at startup, the drum body 19 begins to rotate slowly, and then the drive devices B on both sides rotate periodically at a constant speed. In this manner, at the initial stage of startup, the drum body 19 rotates slowly, so that the startup noise can be reduced, the winding speed is slowed down, and the safety of startup is maintained.

Further, the drive device B and the reduction gear device C are arranged close to each other, and the rotational force from the drive device B is directly transmitted to the reduction device C, so that the drum body 19
Since the motor rotates, the power transmission structure becomes simple, and the operating noise of power transmission, rotation, etc. is significantly reduced.

When stopping and holding the load, the brake device D provided at the end of the drive device B is operated, but the brake noise generated during this braking is
The inner cover 30 and the outer cover 31 insulate and reduce noise, and since both covers 30 and 31 are arranged with a space 32 that is difficult to transmit vibrations caused by brake noise, both of them are free from resonance. The effect is even more remarkable.

In this way, in the hoist of the present invention, since the drive devices are arranged on both sides of the wire winding drum in the axial direction via reduction gears, the startup noise can be reduced by the startup time lag of both drive devices. At the same time, the winding speed at startup is slowed down.
It can also contribute to startup safety. In addition, the power of the drive device is directly transmitted to the speed reduction device placed in close proximity to rotate the wire winding drum, so the drive device is not placed on the opposite side of the wire winding drum as in the past. The power transmission/rotation structure is significantly simpler than that of a system in which the power is transmitted to a reduction gear, which is then transmitted to a wire winding drum, and the operating noise of the machine can be significantly reduced. Brake noise generated when the load is stopped or the like is effectively prevented by the inner cover and outer cover of the brake cover device.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of a conventional hoist, Figs. 2 and 3 show an embodiment of the present invention, Fig. 2 is a front view of the hoist, and Fig. 3 is a half-sectional front view of the hoist. . 11 is a hoist, A is a wire winding drum, B
is a drive device, C is a deceleration device, D is a brake device,
F is a brake cover device.

Claims (1)

[Scope of utility model registration request] A drive device for driving the wire winding drum via a speed reduction device is disposed on both sides of the wire winding drum in the axial direction, and a brake device disposed at the end of the drive device is provided in a predetermined space. A hoist characterized in that the hoist is surrounded by a brake cover device consisting of an inner cover and an outer cover arranged in the same manner.