JP2006089162A - Brake of hoisting machine for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake of a hoisting machine for an elevator capable of maintaining the elasticity even when a shock-absorbing member including rubber provided between an electromagnetic magnet and a moving core is low at temperature. <P>SOLUTION: In order to heat a shock-absorbing member including rubber, the current in an electromagnetic coil 5 during the conduction is measured by a heating control device 60, and the estimated temperature of the electromagnetic coil 5 is calculated by calculating the resistance of the electromagnetic coil 5 from the current value. When the estimated temperature is lower than the set reference value, the current capable of heating only the shock-absorbing member 9 is allowed to run in the electromagnetic coil 5. Further, during the braking, the estimated temperature is calculated by allowing the weak current in the electromagnetic coil 5, and the shock-absorbing member 9 is heated by increasing the weak current. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a brake used in an elevator hoisting machine, and more particularly to an elevator hoisting machine brake provided with a rubber cushioning member between an electromagnetic magnet and a movable iron core.

  Some conventional devices have a buffer member provided between the movable iron core and the electromagnetic magnet in order to prevent the generation of impact sound that the movable iron core is attracted to and collides with the electromagnetic magnet when the electromagnetic brake of the elevator is released. It was. The buffer member is a sound-absorbing plate in which a rubber plate and a resin plate are overlapped to give elasticity and durability, and is embedded between an electromagnetic magnet of an electromagnetic brake and a movable iron core (for example, Patent Literature 1).

JP-A-8-73143

  In the conventional elevator hoist brakes as described above, rubber is used as a buffer member. However, when the temperature of the rubber itself decreases, the rubber transitions from rubber to glass, and the elasticity rapidly decreases. In addition, the impact absorption and the relaxation of the impact sound during brake operation are drastically reduced and the life of the rubber is also reduced. However, the conventional elevator hoist brake does not take into account such elastic characteristics of rubber at low temperatures. Therefore, at a low temperature, it is not possible to prevent the generation of an impact sound that the movable iron core is attracted to and collides with the electromagnetic magnet, but this impact sound is transmitted from the machine room to the living room and becomes an elevator noise.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator hoisting machine capable of maintaining the elasticity of a rubber cushioning member between an electromagnetic magnet and a movable iron core even at a low temperature. Is to provide a brake.

  The elevator hoisting machine brake according to the present invention includes a lining that contacts a braking surface of a rotating body that rotates together with the hoisting machine, and a movable iron core that is connected to the lining and can reciprocate in a direction that causes the lining to contact and separate from the braking surface. An electromagnetic magnet having an electromagnetic coil that attracts the movable iron core in the excited state and separates the lining from the braking surface, an elastic member that presses the lining against the braking surface when the electromagnetic magnet is not excited, and the electromagnetic magnet and the movable iron core. A rubber-made cushioning member which is provided between and loses the buffering action at a predetermined temperature or lower, a resistance value calculating means for calculating a resistance value of the electromagnetic coil based on an energization current to the electromagnetic coil of the electromagnetic magnet, and a resistance value Temperature estimation means for calculating an estimated temperature of the electromagnetic coil based on the temperature, and a temperature determination means for comparing the estimated temperature with a preset reference temperature When the estimated temperature is lower than the reference temperature based on the comparison determination by the temperature determination means, it is determined that the temperature of the buffer member is lower than the predetermined temperature, and a heating current for heating the buffer member to a predetermined temperature or higher is determined. And a current control means for applying to the electromagnetic coil.

  According to the elevator hoisting brake according to the present invention, the elasticity of the buffer member can be maintained by heating the rubber buffer member, so that the elasticity of the rubber can be maintained even when the temperature around the elevator is low. The original role of rubber as a buffer member can be maintained without deteriorating the thickness.

Embodiment 1 FIG.
1 to 6 show an embodiment of an elevator hoist brake according to the present invention. FIG. 1 is a cross-sectional view showing a schematic structure of an elevator hoist brake in a braking state. These are sectional drawings which showed the schematic structure of the hoisting machine brake for elevators in a released state. 3 is a BB cross-sectional view in FIG. 1, and FIG. 4 is a DD cross-sectional view in FIG. FIG. 5 is a characteristic diagram of a general rubber showing the relationship between temperature and hardness, and FIG. 6 is a functional block diagram of a heating control device for an elevator hoisting machine brake.

  In these drawings, an elevator hoist brake is used together with a cylindrical brake ring 2 having a braking surface 1 on the inside which is a rotating body connected to a rotating shaft (not shown) of the elevator hoist. It is attached to a hoisting machine frame (not shown) and installed in a space in the brake ring 2. In the illustrated example, a pair of elevator hoist brakes are arranged symmetrically on the left and right in the figure.

  Each of the elevator hoisting machine brakes is provided with a lining 3 that is separated from the braking surface 1 of the brake ring 2 that rotates together with a hoisting machine (not shown), and a movable iron core that is connected to and supports the lining 3. 4. The movable iron core 4 is supported so as to be able to reciprocate in the direction in which the lining 3 is brought into contact with and separated from the braking surface 1 of the brake ring 2. The elevator hoist brake also includes an electromagnetic magnet 7 having an electromagnetic coil 5 and a magnetic iron core 6 that attracts the movable iron core 4 in the excited state to separate the lining 3 from the braking surface 1. An elastic member 8, which is a coil spring that presses the lining 3 against the braking surface 1 when the electromagnetic magnet 7 is not excited, is provided between the electromagnetic magnet 7 and the movable iron core 4 in a compressed state.

  A buffer member 9 containing rubber is provided between the electromagnetic magnet 7 and the movable iron core 4. In the illustrated example, the buffer member 9 is fixed to the side of the magnetic iron core 6 of the electromagnetic magnet 7 facing the movable iron core 4. The plane-related position of the buffer member 9 with respect to the magnetic iron core 6 is shown in FIG. 3 together with the electromagnetic coil 5 and the elastic member 8. The buffer member 9 has a buffer function of absorbing an impact when the movable iron core 4 is magnetically attracted to the electromagnetic magnet 7 and abuts against the electromagnetic magnet 7 against the elastic force of the elastic member 8. However, since the buffer member 9 includes, for example, layered rubber, for example, when the ambient temperature is minus 10 degrees Celsius or less, the rubber property is lost at a predetermined temperature or less, which will be described in detail later, and the glass becomes a glass. The buffer action is lost.

  FIG. 5 is a characteristic diagram of a general rubber showing the relationship between temperature and hardness. The property of elasticity of rubber is considered to be caused by the active thermal motion of the thread-like molecules that make up the rubber. Rubber remains rubbery at room temperature, but as the temperature decreases, the thermal motion of the molecules is gradually constrained and reaches a temperature at which the molecules cannot move freely. This temperature is called the glass transition point. When the temperature of the rubber becomes lower than the glass transition point, the movement of molecules is suppressed, the rubber becomes hard like glass, and does not show the inherent elasticity of rubber.

  As examples of glass transition points, the glass transition point of butadiene rubber is minus 105 degrees Celsius, the glass transition point of natural rubber is minus 73 degrees Celsius, and the glass transition point of chlorosulfonated polyethylene rubber is minus 34 degrees Celsius. . The rubber used in the first embodiment is assumed to be nitrile rubber, and the glass transition point of the nitrile rubber is minus 10 degrees to minus 55 degrees Celsius.

  Further, as shown in FIG. 5, the rubber loses elasticity in an environment where the temperature is low, and is not suitable for the original use purpose of the buffer member 9 that exhibits a buffering action between the electromagnetic magnet 7 of the elevator and the movable iron core 4. In order to maintain the original purpose of use of the rubber as the buffer member 9, it is necessary to maintain the original elasticity of the rubber by heating the rubber even when the ambient temperature is lowered.

  In order to maintain the inherent elasticity of the rubber, it is necessary to keep the rubber at a temperature higher than the point A in FIG. When the temperature around the rubber is lowered, the temperature of the rubber itself is also lowered, and the elasticity of the rubber is lowered. Therefore, it is necessary to treat the rubber from the outside.

  Thus, the elevator hoist brake of the present invention includes the heating control device 60 in order to maintain the temperature of the cushioning member 9 including rubber at a predetermined temperature or higher, which is a glass transition point.

  The heating control device 60 for an elevator hoist brake according to the first embodiment shown in FIG. 6 energizes the electromagnetic coil 5 and measures a current measurement means 61 for measuring the energization current, and calculates a resistance based on the energization current. It has resistance calculation means 62 for calculating the resistance of the electromagnetic coil 5 by calculation in the calculation section 67, and estimated temperature calculation means 63 for calculating the estimated temperature of the electromagnetic coil 5 based on this resistance. The calculation by the estimated temperature calculation means 63 is executed by the estimated temperature calculation calculation unit 66 based on the temperature-resistance relational expression data 66a and the temperature and resistance actual measurement data 66b of the electromagnetic coil 5, as will be described later.

  The heating control device 60 also compares the estimated temperature of the electromagnetic coil 5 calculated in this way with a preset reference temperature 64a which will be described in detail later, and when the estimated temperature is lower than the reference temperature 64a. The temperature determining unit 64 determines that the temperature of the buffer member 9 is lower than a predetermined temperature that is a glass transition point. When it is determined that the estimated temperature of the electromagnetic coil 5 is lower than the reference temperature 64a based on the comparison determination by the temperature determination means 64, the temperature of the buffer member 9 is considered to be lower than the predetermined temperature (glass transition point). In this case, current control means 65 for applying a heating current to the electromagnetic coil 5 is provided in order to heat the electromagnetic coil 5 and set the temperature of the buffer member 9 to a predetermined temperature or higher.

  A current control changing means 68 is connected to the current control means 65 in order to change the value of the current applied by the current control means 65 during braking and during braking release.

  The temperature of the electromagnetic coil 5 is measured by measuring the resistance value from the energization current of the electromagnetic coil 5 and estimating the temperature. This temperature estimation is performed using the constant mass resistance temperature coefficient of the conductor metal, and this constant mass resistance temperature coefficient has a constant mass without taking into account expansion and contraction due to the temperature of the conductor metal. This is the temperature coefficient when considering how the resistance of copper wire changes with temperature.

For example, the electric resistance value R _t of the conductor metal in Celsius t _degrees, when the electrical resistance of the conductor metal in Celsius t ₁ ° R _t1, and a constant mass resistance temperature coefficient at C t ₁ ° and alpha _t1, The following relational expression holds.

R _t = R _t1 {1 + α _t1 (t−t ₁ )}

Here, for example, when the electromagnetic coil 5, which is a conductor metal, is a copper wire, t ₁ is 0 degrees Celsius, and α _t1 (= α ₀ ) when the electrical conductivity of the copper wire at 0 degrees Celsius is 100% is It is the following value.

α ₀ = 0.00427

  As described above, an approximate linear expression is established between the temperature and the electrical resistance of the conductor metal. Accordingly, in the electromagnetic coil 5, if the electrical resistance at the reference temperature and the constant mass resistance temperature coefficient are obtained in advance, the electrical resistance at an arbitrary temperature is calculated from an approximate linear equation. it can. Also, this approximate electrical resistance is substantially the same, although there is some width in the electromagnetic coil in the brake of the same specification manufactured.

  Thereby, the electric current is calculated by measuring the current flowing through the electromagnetic coil 5 according to the first embodiment, whereby the estimated temperature of the electromagnetic coil 5 can be calculated.

  As another measurement method, the electric resistance may be calculated by measuring the voltage applied to the electromagnetic coil 5 at the same time as the current.

  In general, rubber does not become glassy at room temperature, but at a very low temperature below freezing, and it is installed in a cold region or installed in a cold region and the frequency of elevator use is low. Or, it may be installed in a cold area and the elevator is turned off at night.

  From the above, when the electric resistance of the electromagnetic coil 5 is measured to estimate the temperature around the buffer member 9 including the rubber fixed to the electromagnetic magnet 7, and when it can be determined that the temperature around the buffer member 9 is low A current sufficient to heat the buffer member 9 is passed through the electromagnetic coil 5, and the buffer member 9 is also heated together with the electromagnetic magnet 7, thereby preventing the elastic elasticity of the buffer member 9 from being lowered. It can be seen that the original function as the buffer member 9 can be maintained in the upper brake.

  Next, the operation will be described. FIG. 6 is a functional block diagram of the heating control device 60 for the elevator hoist brake according to the first embodiment. Hereinafter, the operation at the time of braking and at the time of releasing the brake will be described using a functional block diagram.

  When releasing the elevator hoist brake, the movable iron core 4 is attracted to the electromagnetic magnet 7 as shown in FIG. In addition, a current (excitation current) sufficient for the electromagnetic magnet 7 to hold the movable core 4 is attracted to the electromagnetic coil 5.

  First, the current flowing through the electromagnetic coil 5 is measured by the current measuring means 61. The measured electric current of the electromagnetic coil 5 is calculated by the resistance calculating unit 62 by the resistance calculating unit 67, and the electric resistance of the electromagnetic coil 5 in the current state is calculated.

  Next, the estimated electrical resistance of the electromagnetic coil 5 is calculated by the estimated temperature calculation means 63 via the estimated temperature calculation calculation unit 66. Here, in the estimated temperature calculation calculation unit 66, the actual measurement data 66b of the temperature and the electric resistance of the electromagnetic coil 5 and the data 66a of the relational expression of the temperature and the electric resistance are registered in advance. An approximate linear equation of the conductor metal is used.

  The calculated estimated temperature of the electromagnetic coil 5 is compared with a reference temperature 64a set in advance by the temperature judging means 64. If the estimated temperature value is larger than the reference temperature 64a, the operation is terminated, and the estimated temperature is smaller than the reference temperature 64a. Proceed to the next step. The reference temperature 64a set here sets a temperature value in the vicinity of point A in FIG.

  In the first embodiment, since the glass transition point of the nitrile rubber used as the buffer member 9 is minus 55 degrees Celsius to minus 10 degrees Celsius, the value of the reference temperature 64a is set to minus 10 degrees Celsius. That is, the point A in FIG. 5 is minus 10 degrees Celsius in the first embodiment.

  When the estimated temperature is lower than the reference temperature 64a, the exciting current flowing in the electromagnetic coil 5 by the current control means 65 is increased to the maximum amount that can be passed. Since the electromagnetic coil 5 is heated by the increased current, the buffer member 9 including rubber provided in the vicinity of the electromagnetic coil 5 is also heated at the same time, and the rubber can regain proper elasticity as the buffer member 9.

  Further, since the calculated estimated temperature is the estimated temperature of the electromagnetic coil 5 itself, a corrective action is required to apply this to the estimated temperature of the buffer member 9. For example, the relationship between the increased current flowing through the electromagnetic coil 5 for raising the buffer member 9 by 1 degree Celsius and the time is obtained in advance by experiments and the like in consideration of the positional relationship of the buffer member 9 and the thermal conductivity. . Through this experiment and the like, the current value and time applied to the electromagnetic coil 5 necessary for raising the temperature of the buffer member 9 are calculated. When a current for heating the buffer member 9 is supplied to the electromagnetic coil 5, as a corrective action, control is performed so that a constant current is applied for a certain time based on this calculation.

  Further, since this operation is always repeated, the estimated temperature of the buffer member 9 is always monitored, and appropriate elasticity as the buffer member 9 can be maintained.

  At the time of braking of the elevator hoist brake, generally no current flows through the electromagnetic coil 5, and the movable iron core 4 is pressed toward the braking surface 1 by the elastic member 8 as shown in FIG. In addition, friction force is generated by the lining 3 abutting against the braking surface 1.

  However, during braking, it is assumed that a weak current for measuring electrical resistance flows through the electromagnetic coil 5 by the current control changing means 68 that can change the current applied by the current control means 65.

  First, a weak current flowing through the electromagnetic coil 5 is measured by the current measuring means 61. Here, the weak current is a current having a value such that the electromagnetic magnet 7 never attracts the movable iron core 4 even when a current is passed through the electromagnetic coil 5 in a state where the elevator hoisting machine is braking. The measured electric current of the electromagnetic coil 5 is calculated by the resistance calculation unit 62 through the calculation by the resistance calculation calculation unit 67.

  Next, the estimated electrical resistance of the electromagnetic coil 5 is calculated by the estimated temperature calculation means 63 via the estimated temperature calculation calculation unit 66. The calculated estimated temperature of the electromagnetic coil 5 is compared with a preset reference temperature 64a. If the estimated temperature is higher than the reference temperature 64a, the operation is terminated, and if the estimated temperature is lower than the reference temperature 64a, the process proceeds to the next step. .

  When the estimated temperature of the electromagnetic coil 5 is lower than the reference temperature 64a, the weak current flowing through the electromagnetic coil 5 is increased by a certain amount by the current control means 65. Here, in addition to the weak current for measuring the electric resistance of the electromagnetic coil 5, a weak current for heating the buffer member 9 containing rubber is applied, but the increase in the weak current does not exceed a certain amount. It is controlled by the current control means 65. In addition, since this functional operation is always repeated, the estimated temperature of the buffer member 9 is always monitored, and proper elasticity as the buffer member 9 can be maintained.

  As described above, as a correction process for the estimated temperature of the electromagnetic coil 5 and the buffer member 9, a weak current value to be applied to the electromagnetic coil 5 necessary for increasing the temperature of the buffer member 9 by an experiment or the like in advance. Time is calculated. When a weak current for heating the buffer member 9 is passed through the electromagnetic coil 5, as a correction treatment, control is performed so that a constant weak current is applied only for a predetermined time based on this calculation.

  Thus, according to the elevator hoisting machine brake according to the first embodiment, the temperature around the hoisting machine is about the buffer member 9 including the rubber provided between the electromagnetic magnet 7 and the movable iron core 4. Even when the temperature falls below the glass transition point of rubber, a current sufficient to individually heat the buffer member 9 can be applied to the electromagnetic coil 5 during operation of the elevator and during braking, and the electromagnetic magnet 7 can be heated. Therefore, the rubber of the buffer member 9 can maintain its original properties as a buffer member without losing elasticity.

  In the first embodiment shown in FIG. 1, two elevator hoist brakes are provided. However, one elevator may be provided, and the hoisting machine rotating shaft (not shown) is used as a center for the circumferential direction. There may be a plurality of three or more. In the case where a plurality of elevator hoist brakes are provided, a weak current for electric resistance measurement is allowed to flow through only one of the plurality of electromagnetic magnets 7 during braking, and the heating current is applied to all elevators. It may be controlled to energize the electromagnetic magnet 7 of the hoisting machine brake.

  This is because a weak current for measuring an electric resistance value is caused to flow through the electromagnetic magnet 7 during braking, or a weak current for heating is added when the body temperature of the electromagnetic magnet 7 is below the point A in FIG. In order to prevent a situation in which the movable iron cores 4 of all the elevator hoist brakes are sucked due to some situation (for example, when a large current flows).

  Moreover, you may provide the buffer member 9 provided in the electromagnetic magnet 7 in FIG. 1 and FIG. Even in this case, the same effect as the case where the buffer member 9 is provided in the electromagnetic magnet 7 can be obtained. Since the movable iron core has a smaller mass than the electromagnetic magnet, the thermal time coefficient is small, so that the temperature of the buffer member 9 is increased more quickly when the rubber of the buffer member is provided on the electromagnetic magnet side than on the electromagnetic magnet side. Can do.

  In addition, in the case of an elevator system using a thin hoisting machine, the hoisting machine and the brake body are smaller in mass than the conventional elevator system, so that the thermal time coefficient is reduced, and the external temperature and elevator car are reduced. It is easily affected by the driving frequency. In cold districts and the like, if the frequency of raising and lowering the elevator car of a system using a thin hoisting machine decreases, the temperature of the hoisting machine and the brake body may be rapidly lowered. For this reason, the effect by this Embodiment 1 can be anticipated in the elevator system using the thin winding machine which has spread recently.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view of the main part showing the state of braking of the elevator hoist brake according to the second embodiment, and FIG. 8 is the main part showing the state of brake release of the elevator hoist brake of FIG. FIG. In the figure, the movable iron core 4 is provided with a heating coil 10. The heating coil 10 heats the buffer member 9 together with the electromagnetic coil 5. In addition to the purpose of heating the buffer member 9, the heating coil 10 adds the magnetic flux generated in the heating coil 10 to the magnetic flux generated in the electromagnetic coil 5 and increases or decreases the magnetic flux generated by the electromagnetic coil 5. It is also possible to use it for the purpose of controlling the magnetic field between the movable core 4 and the movable iron core 4.

  FIG. 9 is a CC cross-sectional view showing the contact surface of the elastic member 8 of the movable iron core 4 in FIG. In the figure, two heating coils 10 are provided on the surface of the movable iron core 4. Other configurations are the same as those of the first embodiment.

  Next, the operation will be described. The method for calculating the estimated temperature of the electromagnetic coil 5 is the same as in the first embodiment. A current for heating the buffer member 9 together with the electromagnetic coil 5 is supplied to the heating coil 10, and the movable iron core 4 is heated by the current, so that the temperature of the buffer member 9 provided in the electromagnetic magnet 7 rises to a reference temperature or higher. It is something to be made.

  Further, depending on the direction and magnitude of the current flowing through the heating coil 10, the magnetic flux generated in the heating coil 10 can cancel or bundle the magnetic flux generated in the electromagnetic coil 5. If a large current flows in the direction of canceling the magnetic flux, the movable iron core 4 is not attracted to the electromagnetic magnet 7 and the elevator hoist brake is in a braking state. On the other hand, when an electric current flows in the direction in which the magnetic flux is bundled, the movable iron core 4 is attracted to the electromagnetic magnet 7 and the elevator hoisting machine brake is released. For this reason, at the time of braking and at the time of braking release, the direction and magnitude of the current flowing through the heating coil 10 may be changed to control the magnetic field between the electromagnetic coil 5 and the heating coil 10.

  Further, when the hoist has a plurality of brakes as in the first embodiment, the current is executed between the control of the magnetic field between the electromagnetic coil 5 and the heating coil 10 and the time of braking and the time of braking release. The buffer member 9 can be heated more quickly by flexibly controlling the control change means.

  For example, at the time of braking, if the current of each coil is controlled so that the magnetic flux generated in the electromagnetic coil 5 and the magnetic flux generated in the heating coil 10 cancel each other, only one of the electromagnetic coils 5 as in the first embodiment. There is no need for control such as passing a resistance value calculation or heating current or weakening the current.

  For this reason, when the estimated temperature of the electromagnetic coil 5 is lower than the reference temperature, the buffer member 9 can be heated more quickly by controlling the current to flow through both of the two heating coils 10 simultaneously.

  In addition, when the estimated temperature of the electromagnetic magnet 7 is higher than the reference temperature, no current flows through the two heating coils 10, and one of the two electromagnetic coils 5 is sequentially weak for calculating the electric resistance value. You may control so that an electric current may be sent.

  Thus, according to the elevator hoisting machine brake according to the second embodiment, the temperature around the hoisting machine is the rubber of the buffer member 9 provided between the electromagnetic magnet 7 and the movable iron core 4. Even when the temperature is lower than the glass transition point, a current sufficient to individually heat the buffer member 9 at the time of braking and at the time of releasing the brake is applied to the electromagnetic coil 5 and the heating coil 10, and the electromagnetic magnet 7 is Since it can heat, the rubber | gum of the buffer member 9 can maintain the property as the original buffer member 9 without impairing elasticity. Furthermore, since the electromagnetic coil 5 and the heating coil 10 are energized at the same time, the buffer member 9 can be heated with two coils, and the magnetic flux between the coils can be controlled. Therefore, compared to the first embodiment, The buffer member 9 can be heated more quickly and more flexibly.

It is a block diagram which shows the state at the time of braking of the hoisting machine brake for elevators by Embodiment 1 of this invention. It is a block diagram which shows the state at the time of cancellation | release of the elevator hoisting machine brake by Embodiment 1 of this invention. It is BB sectional drawing which shows the elastic member contact surface of the electromagnetic magnet in FIG. It is DD sectional drawing which shows the elastic member contact surface of the movable iron core in FIG. It is a characteristic view of general rubber showing the relationship between temperature and hardness. It is a functional block diagram of the heating control apparatus of the hoisting machine brake for elevators by Embodiment 1 of this invention. It is a block diagram which shows the state at the time of braking of the hoisting machine brake for elevators by Embodiment 2 of this invention. It is a block diagram which shows the state at the time of cancellation | release of the elevator hoisting machine brake by Embodiment 2 of this invention. It is CC sectional drawing which shows the elastic member contact surface of the movable iron core in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Braking surface, 2 Brake ring, 3 Lining, 4 Moving iron core, 5 Electromagnetic coil, 6 Magnetic iron core, 7 Electromagnetic magnet, 8 Elastic member, 9 Buffer member, 60 Heating control apparatus, 61 Current measuring means, 62 Resistance calculation means, 63 Estimated temperature calculation means, 64 Temperature determination means, 64a Reference temperature, 65 Current control means, 66 Estimated temperature calculation calculation section, 66a Relational expression data of temperature and resistance, 66b Actual measurement data of temperature and resistance, 67 Resistance calculation calculation section, 68 Current control changing means.

Claims (4)

A lining in contact with the braking surface of the rotating body that rotates with the hoisting machine;
A movable iron core coupled to the lining and capable of reciprocating in a direction in which the lining contacts and separates from the braking surface;
An electromagnetic magnet having an electromagnetic coil that attracts the movable iron core in an excited state and separates the lining from the braking surface;
An elastic member that presses the lining against the braking surface when the electromagnetic magnet is in a non-excited state;
A rubber cushioning member that is provided between the electromagnetic magnet and the movable iron core and loses a cushioning action at a predetermined temperature or lower;
A resistance value calculating means for calculating a resistance value of the electromagnetic coil based on an energization current to the electromagnetic coil of the electromagnetic magnet;
Estimated temperature calculating means for calculating an estimated temperature of the electromagnetic coil based on the resistance value;
A temperature determination means for comparing and determining the estimated temperature with a preset reference temperature;
Based on the comparison determination by the temperature determination means, when the estimated temperature is lower than the reference temperature, it is determined that the temperature of the buffer member is lower than the predetermined temperature, and the buffer member is set to be equal to or higher than the predetermined temperature. A hoisting machine brake for an elevator, comprising: current control means for applying a heating current for heating to the electromagnetic coil.   The elevator hoisting brake according to claim 1, further comprising a current control changing means capable of changing a value of a current applied by the current control means at the time of braking and at the time of releasing the brake.   A plurality of brake assemblies each including the lining, the movable iron core, the electromagnetic magnet, the elastic member, and the buffer member are distributed in the circumferential direction around the rotation axis of the rotating body, and the current control The elevator hoist brake according to any one of claims 1 to 2, wherein the means applies the heating current to each of the brake assemblies in turn during braking.   The elevator hoisting brake according to any one of claims 1 to 3, further comprising a heating coil that is provided on the movable iron core and heats the buffer member.

Images