JP5495811B2 - Elevator hoist brake - Google Patents

Description

  The present invention relates to an elevator hoist brake in which a cushion rubber is provided between an electromagnetic magnet and a movable iron core.

  With conventional elevator hoist brakes, the impact noise between the electromagnetic magnet and the movable iron core during suction (release) is reduced, and the movable iron core is released from the electromagnetic magnet when the fall current value is high when falling (during braking). Therefore, rubber is provided between the electromagnetic magnet and the movable iron core. However, rubber is vulnerable to changes in the temperature environment, becomes hard in a low temperature region, and hardly plays its role.

  On the other hand, a method has been proposed in which a current is passed through an electromagnetic magnet and the temperature is kept at a certain value or more so as not to impair the properties of the rubber (for example, see Patent Document 1).

JP 2006-89162 A

  In the conventional hoisting machine brake as described above, the current can be passed through the electromagnetic magnet at low temperatures to maintain the characteristics of the rubber, but at high temperatures, the rubber is softened and the spring constant of the rubber is reduced. In this case, since the rubber bending allowance does not change, the reaction force of the rubber is lowered, and the function as a cushion material cannot be secured.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain an elevator hoisting machine brake that can ensure the function of a cushion rubber even at high temperatures.

  The elevator hoisting machine brake according to the present invention includes an electromagnetic magnet having a fixed iron core and a brake coil, a movable iron core that is displaceable in a direction to contact and separate from the electromagnetic magnet, a lining that is mounted on the movable iron core and is in contact with and separated from the braking surface An urging means for urging the movable iron core in a direction in which the lining is pressed against the braking surface, a rubber receiving member provided on the fixed iron core and having a linear expansion coefficient larger than that of the fixed iron core, and an electromagnetic magnet and the movable iron core Cushion rubber is provided on the rubber receiving member so as to be positioned between them, and the movable iron core abuts when the brake is released.

  In the elevator hoisting machine brake according to the present invention, since the cushion rubber is provided on the rubber receiving member having a larger linear expansion coefficient than the fixed iron core, the rubber receiving member expands at a high temperature so that the cushion rubber is moved to the movable core side. As a result, the bending amount of the cushion rubber when the movable iron core comes into contact is increased, and the function of the cushion rubber can be ensured.

It is sectional drawing of the hoisting machine brake of the elevator by Embodiment 1 of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is a characteristic view which shows the relationship between the hardness of general rubber | gum, and temperature. It is an enlarged view which shows the state at the time of normal temperature of the rubber receiving member and cushion rubber | gum of FIG. It is an enlarged view which shows the state at the time of the high temperature of the rubber receiving member and cushion rubber | gum of FIG. It is sectional drawing of the hoisting machine brake of the elevator by Embodiment 2 of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a cross-sectional view of an elevator hoist brake according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 1 shows a braking state. The brake drum 1, which is a rotating body, is rotated integrally with the drive sheave. A plurality of suspension means (for example, a rope or a belt) for suspending a car and a counterweight are wound around the drive sheave. A braking surface 1 a is formed on the inner peripheral surface of the brake drum 1.

  Inside the brake drum 1, a pair of hoisting machine brakes 2 are arranged in opposite directions. Each hoisting machine brake 2 has an electromagnetic magnet 3, a movable iron core 4, a lining 5, and a brake spring 6 as an urging means.

  The electromagnetic magnet 3 is fixed to a fixing part (not shown) of the hoisting machine. The electromagnetic magnet 3 has a fixed iron core 7 and a brake coil 8. Further, a coil insertion groove 7a, a spring insertion hole 7b, and a pair of rubber receiving member insertion holes 7c are provided on the surface of the electromagnetic magnet 3 facing the movable iron core 4.

  The brake coil 8 is inserted into the coil insertion groove 7a. The spring insertion hole 7b is disposed at the center of the fixed iron core 7, and the rubber receiving member insertion holes 7c are disposed on both sides of the spring insertion hole 7b.

  The movable iron core 4 can be displaced in a direction in which it is in contact with or separated from the electromagnetic magnet 3 (left-right direction in FIG. 1). The lining 5 is mounted on the movable iron core 4, is displaced together with the movable iron core 4, and is brought into contact with and separated from the braking surface 1a.

  The brake spring 6 has a base end inserted into the spring insertion hole 7 b and a tip end in contact with the movable iron core 4. The brake spring 6 biases the movable iron core 4 in a direction in which the lining 5 is pressed against the braking surface 1a.

  When the electromagnetic magnet 3 is excited, the movable iron core 4 is attracted to the electromagnetic magnet 3 side, the lining 5 is pulled away from the braking surface 1a against the spring force of the brake spring 6, and the braking force is released. Further, by releasing the excitation of the electromagnetic magnet 3, the lining 5 is pressed against the braking surface 1a by the spring force of the brake spring 6, and the stationary state of the brake drum 1 and the drive sheave is maintained or the rotation is braked.

  A cylindrical rubber receiving member (spacer) 9 is inserted into each rubber receiving member insertion hole 7c. The rubber receiving member 9 is made of a material having a larger linear expansion coefficient (thermal expansion coefficient) than the material (iron-based) of the fixed core 7 such as aluminum, zinc, lithium, or hafnium. Moreover, as a material of the rubber receiving member 9, for example, a resin material such as an acrylic resin may be used.

  A disc-shaped cushion rubber 10 is fixed to the end surface of the rubber receiving member 9 exposed outside the rubber receiving member insertion hole 7c. That is, the cushion rubber 10 is attached to the rubber receiving member 9 so as to be positioned between the electromagnetic magnet 3 and the movable iron core 4, and the movable iron core 4 contacts the cushion rubber 10 when the brake is released. The rubber receiving member 9 is disposed under the cushion rubber 10 as a seat for the cushion rubber 10.

  Here, FIG. 3 is a characteristic diagram showing the relationship between the hardness and temperature of general rubber. Even if the cushion rubber 10 is within the range A to B used in design, the cushion rubber 10 is softened at a high temperature and its spring constant is lowered.

  4 is an enlarged view showing a state of the rubber receiving member 9 and the cushion rubber 10 of FIG. 1 at normal temperature, and FIG. 5 is an enlarged view showing a state of the rubber receiving member 9 and the cushion rubber 10 of FIG. 1 at a high temperature. At normal temperature, the cushion rubber 10 protrudes from the surface of the fixed iron core 7 by a protrusion amount B. On the other hand, at a high temperature, the rubber receiving member 9 having a linear expansion coefficient larger than that of the fixed iron core 7 extends toward the movable core 4 by the extension amount α, so that the cushion rubber 10 is pushed out toward the movable iron core 4 by α. For this reason, the protrusion amount of the cushion rubber 10 from the fixed iron core 7 is B + α.

  Thus, in the hoisting machine brake 2 according to the first embodiment, the bending allowance (compression amount) of the cushion rubber 10 when the movable iron core 4 comes into contact is larger at a higher temperature than at a normal temperature. Therefore, even when the temperature is high, the decrease in the reaction force due to the decrease in the spring constant can be compensated by the increase in the bending allowance, so that the reaction force of the cushion rubber 10 can be secured and the function of the cushion rubber 10 can be secured. it can.

  Moreover, since the cushion rubber 10 is heated due to the heat generated by the brake coil 8, the rubber receiving member 9 is efficiently disposed at a high temperature by arranging the rubber receiving member 9 together with the brake coil 8 on the fixed iron core 7. Can be stretched.

Embodiment 2. FIG.
Next, FIG. 6 is a sectional view of an elevator hoisting machine brake according to Embodiment 2 of the present invention. In the first embodiment, the cushion rubber 10 is disposed on the electromagnetic magnet 3 side. However, in the second embodiment, the cushion rubber 10 is fixed to the movable iron core 4. In other words, the cushion rubber 10 is fixed to the movable iron core 4 so as to face the rubber receiving member 9, and the cushion rubber 10 contacts the rubber receiving member 9 when the brake is released. Other configurations are the same as those in the first embodiment.

  In such a hoisting machine brake 2, the end surface (seat surface) of the rubber receiving member 9 that receives the cushion rubber 10 when the brake is released protrudes toward the movable iron core 4 due to the extension of the rubber receiving member 9 at a high temperature. For this reason, the bending allowance of the cushion rubber 10 when coming into contact with the rubber receiving member 9 becomes larger at a higher temperature than at a normal temperature. Therefore, even when the temperature is high, the decrease in the reaction force due to the decrease in the spring constant can be compensated by the increase in the bending allowance, so that the reaction force of the cushion rubber 10 can be secured and the function of the cushion rubber 10 can be secured. it can.

The number, shape, and position of the cushion rubber 10 and the rubber receiving member 9 are not limited to the above example.
In the first embodiment, the cushion rubber 10 is provided on the electromagnetic magnet 3 side, and in the second embodiment, the cushion rubber 10 is provided on the movable iron core 4 side. However, the cushion rubber 10 may be provided on both sides.
Furthermore, the number of hoisting machine brakes 2 is not limited to two.
Furthermore, as the material of the cushion rubber 10, for example, nitrile rubber, butadiene rubber, natural rubber, chlorosulfonated polyethylene rubber, acrylic rubber, silicon rubber, or fluorine rubber can be used.

  1a Braking surface, 2 hoisting machine brake, 3 electromagnetic magnet, 4 movable iron core, 5 lining, 6 brake spring (biasing means), 7 fixed iron core, 8 brake coil, 9 rubber receiving member, 10 cushion rubber.

Claims (2)

An electromagnetic magnet having a fixed iron core and a brake coil,
A movable iron core that is displaceable in the direction of contacting and separating from the electromagnetic magnet
A lining that is mounted on the movable iron core and is contacted and separated from the braking surface;
A biasing means for biasing the movable iron core in a direction in which the lining is pressed against the braking surface;
A rubber receiving member provided on the fixed iron core, made of a material having a larger linear expansion coefficient than the material of the fixed iron core, and provided on the rubber receiving member so as to be positioned between the electromagnetic magnet and the movable iron core; A cushion rubber against which the movable iron core comes into contact when the brake is released ,
The elevator hoisting brake according to claim 1 , wherein a dimension of the rubber receiving member in a displacement direction of the movable iron core is larger than a dimension of the cushion rubber in the same direction . An electromagnetic magnet having a fixed iron core and a brake coil,
A movable iron core that is displaceable in the direction of contacting and separating from the electromagnetic magnet
A lining that is mounted on the movable iron core and is contacted and separated from the braking surface;
A biasing means for biasing the movable iron core in a direction in which the lining is pressed against the braking surface;
A cushion rubber provided on the movable iron core, and a rubber receiving member provided on the fixed iron core, made of a material having a larger linear expansion coefficient than the material of the fixed iron core, the cushion rubber abutting on when the brake is released ,
The elevator hoisting brake according to claim 1 , wherein a dimension of the rubber receiving member in a displacement direction of the movable iron core is larger than a dimension of the cushion rubber in the same direction .

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