JPS6218630Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a brake release device for an electric chain block or other suspended electric hoisting device, and it is possible to easily release the brake device by external operation while the electric motor is stopped. It is an object of the present invention to provide a brake release device that can adjust the braking force.

Next, this invention will be explained in detail using illustrated examples.

1 to 6 show an embodiment of this invention, in which a magnetic attracting body is placed in a recess formed by the rear end of the stator 2 and the rear end surface of the rotor 15 in the electric motor 1 arranged horizontally. 3 is arranged, and the rotor shaft 4 has the suction body 3 fitted and fixed thereto.
The rear end portion is supported by the casing 5 of the electric motor 1 via a bearing 16 so as to be rotatable and immovable in the axial direction, and a brake disc 7 disposed at the rear of the suction body 3 is rotatably supported by the casing 5 of the electric motor 1 through a bearing 16. A friction plate 18 that faces the fixed brake receiver 6 on the rear inner surface of the casing 5 is fixed to the large diameter portion 17 at the rear end of the brake disc 7, which is fitted in an immovably but slidable manner.

A brake spring 8 is interposed between the suction body 3 and the brake disc 7 in a compressed state and acts to press the brake disc 7 rearward.
A pressing ring 11 is rotatably but immovably fitted in the casing 9 via a bearing 10, and a plurality of pressing rods 12 extending in the front-rear direction are slidably provided at the rear of the casing 5. Fitted, each pressing rod 1
The front end of the press ring 2 faces the rear end surface of the press ring 11.

The rear part of each pressing rod 12 is inserted into the pressing member 14, and the front nut 20 and rear nut 21, which are screwed to the pressing rod 12, are crimped to the front and rear surfaces of the pressing member 14, so that each pressing rod 12 is A pressing rod 12 and a pressing member 1 are fixed to the pressing member 14 and between the casing 5 and the front nut 20.
A return spring 22 is interposed that acts to press the casing 5 rearward, and one end of the operating lever 13 disposed at the rear of the pressing member 14 is connected to a bracket 23 fixed to the outer surface of the rear end of the casing 5. It is pivotally mounted by a horizontal shaft 24. The operating lever 13
A pin-shaped stopper 25 is fixed to the other end, and a bracket 26 is fixed to the outer surface of the rear end of the casing 5 at a position opposite to the other end of the operating lever 13. The stopper 25 is inserted into a long hole 27 extending in the front-rear direction.

The pressing member 1 is located in the middle of the operating lever 13.
A pressing protrusion 25 facing the center of the rear surface of 4
and a strip attachment arm 29 that protrudes rearward are integrally provided, and the arm 29 protrudes from a vertical elongated hole 31 of the cover 30 fixed to the rear end of the casing 5. The upper end of an operating strip 32 such as a string or chain is connected to the tip of the strip 32, and a handle 33 is attached to the lower end of the strip 32. When no pulling force is applied to the strip 32, As shown in FIGS. 2 and 5, the pushing rod 12 and the pushing member 14 are moved rearward by the elasticity of the return spring 22, and the operating lever 13 is moved counterclockwise in FIG. 2 by the pushing member 14. The stopper 25 at the other end of the operating lever 13 engages with the rear end of the elongated hole 27.

One end of a rotating shaft 34 is inserted and connected to the other end of the rotor shaft 4 via a coupling ring 35.
A hollow driven shaft 36 rotatably fitted to the rotating shaft 34 is integrally provided with a load sheave 9 around which a load chain 37 is wound, and a large-diameter driven gear 39 is fixed to the hollow driven shaft 36 . A small-diameter drive gear 40 provided at the end is meshed with an intermediate large-diameter driven gear 42 fixed to a transmission shaft 41 arranged parallel to the rotating shaft 34, and is provided integrally with the transmission shaft 41. The intermediate small diameter drive gear 43 is meshed with the large diameter driven gear 39.

A plate-shaped frame 4 is attached to the front end of the casing 5.
4. A spacer frame 45, a plate frame 46, and a gear box 47 are arranged in sequence and connected by bolts (not shown), and the hollow driven shaft 36 is connected to a boss member 48 fitted into the plate frames 44 and 46. , 49 via a bearing 50, the coupling 35 is supported by one boss member 48 via a bearing 51, and the other end of the rotating shaft 34 is supported by a gear box 47 via a bearing 50.
The transmission shaft 41 is also supported by a gearbox 47 via a bearing (not shown).

The upper parts of the plate-shaped frames 44 and 46 and the lower part of the hanging fitting 53 arranged between them are pivotally connected by a horizontal support shaft 54 extending parallel to the rotating shaft 34, and the upper part of the hanging fitting 53 and the rail The load chain 37 is connected to the lower part of the trolley 56 running along the rail 55 by a horizontal shaft 57 extending perpendicular to the longitudinal direction of the rail, and a lower hook 58 is attached to the hanging end of the load chain 37.

It should be noted that there is a suction body 3 disposed inside the rear end of the stator 2 and fixed to the rotor shaft 4, a brake disc 7 that is attracted and moved by the magnetic force of the suction body 3 when the motor is in operation, and the brake disc 7 is a fixed brake. Since an electric motor with a suction release type brake that is equipped with a brake spring 8 that presses toward the receiver is well known, a detailed explanation thereof will be omitted.

In the device of this embodiment, when the operation of the electric motor 1 in the hoisting device suspending cargo is stopped, the brake disc 7 is pressed against the fixed brake receiver 6 by the elasticity of the brake spring 8, and the brake is activated. stops in a suspended position.

Next, when the handle 33 is grasped and the strip 32 is pulled downward, the operating lever 13 is rotated clockwise in FIG. Each pressing rod 12 is pushed forward against the elasticity of the return spring 22, and the brake disc 7 is moved forward against the elasticity of the brake spring 8 by each pressing rod 12 via the pressing ring 11 and bearing 10. , the friction plate 18 of the brake disc 7 is separated from the fixed brake receiver 6 of the casing 5, or the contact pressure of the friction plate 18 with respect to the fixed brake receiver 6 becomes small, and the weight of the load causes the friction plate 18 to become loose from the fixed brake receiver 6 of the casing 5. As the rotor shaft 4, the suction body 3, the brake disc 7, the rotor 15, etc. attached to the rotor shaft 4 are rotated, the cargo is lowered. In this case, by adjusting the turning force of the operating lever 13 by the strip 32, the descending speed of the cargo can be adjusted. Further, since the press ring 11 is rotatably attached to the brake disc 7 via the bearing 10, even if the brake disc 7 rotates, the press ring 11 is stopped due to frictional resistance with the press rod 12.

Next, when you release your hand from the handle 33, the return spring 2
2, each pressing rod 12 and pressing member 14
is moved rearward, and the operating lever 13 is rotated counterclockwise from the state shown in FIG. It will stop in this state. Furthermore, when the forward pressing force of the pressing ring 11 by the pressing rod 12 is released, the friction plate 18 of the brake disc 7 is pressed against the fixed brake receiver 6 due to the elasticity of the brake spring 8, so the brake is activated again and the load is lowered. stops again.

According to this invention, the brake disc 7 is arranged at the rear of the stator 2 and faces the fixed brake receiver 6 at the rear of the casing 5 of the electric motor 1;
The brake disc 7 in an electric motor with a suction release type brake is provided with a brake spring 8 that presses the brake disc 7 toward the fixed brake receiver 6.
A press ring 11 is rotatably attached via a bearing 10, and a plurality of press rods 12 facing the rear part of the press ring 11 are slidably slidable in the front-rear direction at the rear of the casing 5 of the electric motor. The rear part of each of the pressing rods 12 is fixed to a pressing member 14 that is moved forward by an operating lever 13, and the tip of a strip attachment arm 29 connected to the operating lever 13 has an operating rod. The upper end of the body 32 is connected, and the handle 33 is attached to the lower end of the strip 32, so simply push the handle 33 down below the hanging electric hoist installed above. By pulling, the pressing member 14, pressing rod 12, pressing ring 11
and via the bearing 10, the brake disc 7 can be pushed forward to release the brake or reduce the braking force of the brake, so that the load suspended by the hoisting device can be moved by the electric motor. When the cargo is stopped, it can be lowered manually, or the brakes can be completely released to allow the cargo to descend at a relatively high speed, or the brakes may be in a slipping or semi-braking state to reduce the descending speed of the cargo. Therefore, by lowering the load at high speed and then switching to low speed just above the floor or ground, it can be lowered safely. In addition, when releasing the brake by moving the rotor and the rotor shaft with the brake disc, there is a problem in that the weight of the moved part is quite large, so a large amount of manual operation force is required. Since there is no need to move the rotor shaft to which the heavy rotor is fixed, effects such as manual brake release operation can be achieved easily.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of this invention, in which Figure 1 is a side view showing the electric hoisting device suspended and supported by a trolley, and Figure 2 is a side view of the electric hoisting device suspended and supported by a trolley. A longitudinal side view showing a suction release type brake-equipped electric motor having a brake release device; FIG. 3 is a longitudinal side view showing a deceleration drive section of a load sheave;
Fig. 4 is a longitudinal sectional front view of the brake release device, Fig. 5 is a sectional view taken along line A-A in Fig. 4 showing the state when the brake is in operation, and Fig. 6 is a sectional view showing the state when the brake is in operation. A-A in Figure 4 shows the state immediately before release.
FIG. 3 is a cross-sectional view taken along a line. In the figure, 1 is an electric motor, 2 is a stator, 3 is a suction body, 4 is a rotor shaft, 5 is a casing, 6 is a fixed brake receiver, 7 is a brake disc, 8 is a brake spring, 9 is a load sheave, 10 is a bearing, 11 is a pressing ring, 12 is a pressing rod, 13 is an operating lever, 14 is a pressing member, 18 is a friction plate, 20 is a front nut, 21
is the rear nut, 22 is the return spring, 24 is the horizontal shaft, 2
5 is a stopper, 26 is a bracket, 27 is a long hole,
28 is a pressing protrusion, 32 is an operating strip, 33 is a handle, 34 is a rotating shaft, 35 is a coupling, 36
is a hollow driven shaft, 37 is a road chain, 39 is a large-diameter driven gear, 40 is a small-diameter drive gear, 42 is an intermediate large-diameter driven gear, 43 is an intermediate small-diameter drive gear, 53 is a hanging metal fitting, 55 is a rail, and 56 is a trolley. It is.

Claims (1)

[Scope of utility model registration request] A brake disc 7 disposed at the rear of the stator 2 of the electric motor 1 and facing a fixed brake receiver 6 at the rear of the casing 5 of the electric motor 1 is fitted onto the rotor shaft 4 so as to be slidable and unrotatable,
A brake spring 8 is engaged with the brake disc 7,
In the suspended electric hoisting device in which a load sheave 9 is connected to the rotor shaft 4 via a gear reduction mechanism, a pressing ring 11 is fitted to the brake disc 7 via a bearing 10, and the casing of the electric motor 1 A plurality of pressing rods 12 facing the rear part of the pressing ring 11 are fitted into the rear part of the pressing ring 11 so as to be slidable in the front-rear direction. The upper end of the operating strip 32 is connected to the tip of the strip attachment arm 29 which is fixed to the operating lever 13 and is connected to the operating lever 13, and the handle 33 is attached to the lower end of the strip 32. A brake release device for a suspended electric hoisting device.