JP2013049534A - Brake system for hoisting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the adjustment of a brake gap in a brake system for a hoisting machine that generates a braking force for a hoisting machine of an elevator.SOLUTION: The brake system for the hoisting machine includes a brake disk 10, a brake pad 20, a drive section 3, a controller 2, an interval adjusting member 4, and a buffer 5A. The brake disk 10 rotates together with the rotation of a drive shaft 101a of an electric motor 101. The brake pad 20 can stop the brake disk 10 when its plane part is in abutting contact with a plane part of the brake disk 10. While the drive section 3 causes the brake pad 20 to be engaged with the brake disk 10 so that the respective plane parts are brought into abut-contact with each other, it moves the brake pad 20 away from the brake disk 10. The controller 2 controls the operation of the brake pad 20 by the drive section 3. The interval adjusting member 4 moves the brake pad 20 to the engagement direction and the moving-away direction in a state that its tip is in abut-contact with the back side of the brake pad 20, and adjusts the interval of the respective plane parts. The buffer section 5A is provided at the tip of the interval adjusting member 4.

Description

  Embodiments described herein relate generally to a hoisting brake device that generates a braking force for an elevator hoisting machine.

  An elevator hoisting machine has an electric motor as a driving source and a sheave connected to a driving shaft of the electric motor, and transmits the driving force of the electric motor via a hoisting rope wound around the sheave. Raise and lower. In the elevator, the car is stopped at a desired position by decreasing the driving force of the electric motor. Conventionally, this elevator is provided with a hoisting machine brake device that locks the drive shaft (ie, sheave) of the electric motor so as not to rotate in order to prevent the elevator car from being lifted (displaced) from its stopped state. It has been.

  This hoisting machine brake device includes a brake disk that rotates together with the drive shaft of the electric motor, and a brake pad that generates a frictional force between the brake disk and the brake disk so that the brake disk does not rotate. For example, this type of hoisting machine brake device is disclosed in Patent Documents 1 and 2 below.

Special table 2008-540968 gazette Japanese Patent No. 3940102

  By the way, in the brake device for hoisting machines, an interval (hereinafter also referred to as “brake gap”) is provided between the brake disc and the brake pad, and the brake pad is moved so that the interval is eliminated. While the brake disk is in a rotation stop state (brake operation state), the brake disk is rotated (brake released state) by moving the brake pad so as to increase the interval from this state. In this hoisting machine brake device, the brake gap may change due to wear of the brake pad or aging with use. In addition, the brake gap may change due to temperature changes.

  Here, for example, when the brake gap is larger than the reference set value, the pressing force from the brake pad to the brake disc is reduced, and the rotation stop state of the brake disc may not be maintained. Furthermore, in this case, since the amount of movement of the brake disk increases, there is a possibility that the operation sound will increase. On the other hand, when the brake gap is smaller than the reference set value, the brake gap narrows as the temperature rises, and there is a possibility that the brake disc and the brake pad may be in contact with each other even when the brake is released. There is a risk that the durability of the brake disc and the brake pad may be reduced due to wear. In this hoisting machine brake device, a brake switch that operates as the brake pad moves may be prepared to detect whether the brake is on (brake operating state) or off (brake released state). However, if the brake gap is out of the reference set value, the brake operation may not be confirmed due to the brake switch not operating. In this elevator, if the operation of the hoisting machine brake device cannot be properly confirmed, the control unit determines that the operation is abnormal, and the operation must be stopped.

  As described above, in the hoisting machine brake device, it is necessary to strictly manage the reference set value of the brake gap. Nevertheless, in the conventional hoisting machine brake device, precise adjustment of the brake gap is not easy, and the adjustment work takes time. For example, conventionally, there is one that adjusts the brake gap by the size of the coil frame in the electromagnetic coil portion, and a shim or the like is inserted into the base of a fixing bolt that connects the coil frame and the electric motor.

  The problem to be solved by the present invention is to provide a hoisting machine brake device in which the adjustment of the brake gap is easy.

  The hoisting machine brake device according to the embodiment includes a brake disk, a brake pad, a drive unit, a control unit, a distance adjusting member, and a buffer unit. The brake disk rotates with the rotation of the drive shaft of the electric motor in the hoisting machine for raising and lowering the elevator car. The brake pad has a flat portion opposed to the flat portion of the brake disc, and can stop the brake disc when the flat portions are in contact with each other. The drive unit engages the brake disc with the brake disc so that the flat portions abut against each other, and separates the brake pad from the brake disc. A control part controls operation | movement of the said brake pad by a drive part. The interval adjusting member adjusts the interval between the planar portions by moving the brake pad in the engaging direction and the separating direction in a state where the tip portion is in contact with the back surface of the brake pad. The buffer portion is provided on at least one of the rear surface of the brake pad or the tip portion of the interval adjusting member.

FIG. 1 is a diagram illustrating a hoisting machine brake device according to an embodiment. FIG. 2 is a perspective view illustrating the hoisting machine brake device according to the embodiment, and is a partial cross-sectional view illustrating a relationship between a brake pad and a distance adjusting bolt. FIG. 3 is a diagram illustrating a positional relationship between the brake pad and the distance adjusting bolt according to the embodiment. FIG. 4 is a diagram illustrating a positional relationship between a brake pad and a distance adjusting bolt according to Modification 1 of the embodiment. FIG. 5 is a diagram illustrating a positional relationship between a brake pad and a distance adjusting bolt according to the second modification of the embodiment. FIG. 6 is a diagram illustrating a distance adjusting bolt according to a third modification example in the embodiment. FIG. 7 is a diagram illustrating another example of the interval adjusting bolt according to the third modification of the embodiment. FIG. 8 is a diagram illustrating a hoisting machine brake device according to a fourth modification of the embodiment. FIG. 9 is a diagram illustrating a positional relationship among a brake pad, a distance adjusting bolt, and an elastic member according to Modification 4 of the embodiment.

  Hereinafter, embodiments of a hoisting machine brake device will be described in detail with reference to the drawings.

[Embodiment]
An embodiment of a hoisting machine brake device will be described. FIGS. 1 and 2 illustrate an elevator hoisting machine 100 around an electric motor 101. A hoisting machine brake device that holds the hoisting machine 100 in a stopped state is denoted by reference numeral 1. FIG. Yes. The hoisting machine brake device 1 is used when an emergency stop of a car in a hoistway is performed, and generates a braking force for stopping the electric motor 101. Further, the hoisting machine brake device 1 stops the electric motor 101 at a normal time (except in an emergency), and when the car in the hoistway is stopped at a predetermined position (for example, a predetermined floor number) It is also used to prevent the car from moving up and down. Therefore, the hoisting machine brake device 1 generates a braking force for holding the electric motor 101 in a stopped state.

  This hoisting machine brake device 1 is an elevator having a machine room in which the hoisting machine 100 is arranged together with a control panel, a speed governor and the like (not shown), for example, a rope type in which a machine room is provided above a hoistway. You may apply to an elevator and may apply to the machine room less elevator which has arrange | positioned the hoisting machine 100, a control panel, etc. in the hoistway. In the following, a rope type elevator will be described as an example.

  First, the hoisting machine 100 will be briefly described. The hoisting machine 100 includes an electric motor 101 as a driving source and a sheave 102 connected to a driving shaft 101a of the electric motor 101. The sheave 102 is wound around a hoisting rope (not shown), and is connected to a car (not shown) in the hoistway through another sheave around which the hoisting rope is wound. The hoisting machine 100 raises and lowers the car in the hoistway by the driving force of the electric motor 101 and stops the electric motor 101 at a predetermined position by stopping the electric motor 101. The driving force control of the electric motor 101 is executed by, for example, a control unit (control panel) 2 to which detection signals (such as a car position and an ascending / descending speed) of various sensors are input.

  The hoisting machine brake device 1 is a so-called disc brake including a brake disc and a brake pad. The hoisting machine brake device 1 has a rotating member 10 disposed on the back side of the electric motor 101 (on the side opposite to the sheave 102 in the axial direction of the drive shaft 101a), and the rotating member 10 is pressed against the rotating member 10 to rotate. And a locking member 20 that locks the member 10 so as to be in a rotation stopped state. Hereinafter, the axial direction refers to the axial direction of the drive shaft 101a and the rotating member 10. When simply referred to as the central axis, the center of rotation of the drive shaft 101a and the rotating member 10 is referred to as the central axis. Furthermore, in the following, the sheave 102 side of the electric motor 101 with respect to the back surface is referred to as the front surface. The positional definition of the front surface and the back surface with respect to the axial direction is similarly applied to various members described later such as the rotating member 10 disposed on the central axis.

  The rotating member 10 is a portion facing the locking member 20 on its own rotating track and a portion in contact with the locking member 20 is at least a flat portion. The rotating member 10 corresponds to a brake disk of the hoisting machine brake device 1. For this reason, here, the rotating member 10 is formed into a disk shape from a metal material such as iron or a carbon fiber reinforced carbon composite material. Hereinafter, the rotating member 10 is referred to as a brake disk 10.

  In the illustrated electric motor 101, a drive shaft 101a extends to the back side. Therefore, the center of the brake disk 10 is fixed to the protruding portion on the back side of the drive shaft 101a, and is rotated together with the drive shaft 101a. Here, the drive shaft 101a protrudes also on the back side of the electric motor 101. However, on the back side, a separate rotation shaft that rotates integrally with the drive shaft 101a may be provided. Fixes the brake disc 10 to the rotating shaft.

  On the other hand, the locking member 20 is formed with at least a flat portion at a portion facing the flat portion of the brake disc 10, and the rotation of the brake disc 10 is stopped by pressing the flat portion against the flat portion of the brake disc 10. It can be locked to a state. The locking member 20 corresponds to a brake pad of the hoisting machine brake device 1. For this reason, hereinafter, the locking member 20 is referred to as a brake pad 20.

  The brake pad 20 includes a friction material 20a provided in a portion facing the flat portion of the brake disc 10, and a holding portion 20b made of a metal material such as iron for holding the friction material 20a. The friction material 20a has a flat portion facing the flat portion of the brake disc 10, and the brake disc 10 can be held in a rotation stopped state by bringing the flat portions into contact with each other. Further, the friction material 20a can stop the rotation of the brake disc 10 in the above-described emergency. As for this friction material 20a, the back surface (the side opposite to a plane part) is affixed on the holding | maintenance part 20b. In the illustrated brake pad 20, both the friction material 20a and the holding portion 20b are formed in a disc shape in accordance with the shape of the brake disc 10 (FIG. 3). Here, the diameter of the brake pad 20 (the friction material 20 a and the holding portion 20 b) is set to be approximately the same as the diameter of the brake disk 10.

  Further, in the hoisting machine brake device 1, the brake pad 20 is engaged with the brake disk 10 so that the flat portions of the brake disk 10 and the brake pad 20 come into contact with each other, and the brake pad 20 is connected to the brake disk 20. A drive unit 3 that is spaced apart from 10 is provided. The drive unit 3 includes a first drive mechanism that moves the brake pad 20 in the axial direction toward the brake disk 10, and a second drive mechanism that moves the brake pad 20 in the axial direction so as to move away from the brake disk 10. . This exemplary first drive mechanism uses the elastic force of the elastic member 30. On the other hand, the second drive mechanism utilizes the attractive force when the electromagnetic coil unit 40 is energized. The drive unit 3 is disposed on the back side of the brake pad 20.

  One end of the elastic member 30 is attached to the back surface of the holding portion 20 b of the brake pad 20, and the other end is attached to a member that does not move relative to the brake disk 10. In this illustration, the following coil frame 41 in the electromagnetic coil unit 40 disposed on the back side of the holding unit 20b is used as the member. The coil frame 41 is formed with a holding groove 41a that holds the elastic member 30 in an axially stretchable state. The other end of the elastic member 30 is disposed at the groove bottom of the holding groove 41a.

  The elastic member 30 is longer in the axial direction than the groove depth of the holding groove 41 a and protrudes from the coil frame 41 toward the back surface of the brake pad 20. The elastic member 30 is attached so that the elastic force is generated in a state where the brake pad 20 is in contact with the brake disk 10. Since the coil frame 41 cannot move relative to the brake disc 10, the elastic member 30 presses the brake pad 20 against the brake disc 10 from the back side of the holding portion 20 b by its elastic force. For this reason, the resilience when the brake disk 10 and the brake pad 20 are in contact with each other is set to a magnitude that allows the brake disk 10 that has stopped rotating due to the stop of the electric motor 101 to maintain the stopped state. When the hoisting machine brake device 1 is used even during an emergency stop, for example, the resilience at that time is set to a magnitude that can stop the rotating brake disc 10.

  Here, the illustrated elastic member 30 is, for example, a coil spring, and a plurality of elastic members 30 are arranged radially at substantially equal intervals with respect to the central axis. Each elastic member 30 is arrange | positioned on the concentric circle centering on the central axis. Therefore, the coil frame 41 has a plurality of holding grooves 41 a corresponding to the number and arrangement of the elastic members 30.

  The electromagnetic coil unit 40 includes a coil frame 41 disposed on the back side of the brake pad 20. The coil frame 41 includes an electromagnetic coil 42 to which electric power is supplied from the control unit 2, and is fixed to the electric motor 101 via a plurality of connecting members 43 such as bolts. The control unit 2 controls energization and non-energization of the electromagnetic coil 42.

  Further, the electromagnetic coil unit 40 includes a movable iron core 44. The movable iron core 44 is formed in a column shape concentric with the brake disc 10 and the brake pad 20. In this example, the projecting portion toward the coil frame 41 on the back surface of the holding portion 20 b is a movable iron core 44. When energized, an attractive force in the axial direction that attracts the brake pad 20 toward the coil frame 41 acts on the movable iron core 44.

  The electromagnetic coil unit 40 generates an attractive force having a predetermined magnitude when energized, while the attractive force becomes 0 when not energized. The suction force is set larger than the elastic force of the elastic member 30. Therefore, the brake pad 20 is pressed against the brake disk 10 by the elastic force of the elastic member 30 when not energized, and is separated from the brake disk 10 by the suction force that resists the elastic force of the elastic member 30 when energized. As a result, the hoisting machine brake device 1 is in a brake operating state when not energized, and in a brake released state when energized.

  The coil frame 41 is provided with a guide portion 51 for guiding the brake pad 20 in the axial direction in order to smoothly move the brake pad 20 in the axial direction. The guide portions 51 are, for example, guide shafts erected in the axial direction toward the brake pad 20, and a plurality of guide portions 51 are arranged radially at substantially equal intervals with respect to the central axis. Each guide portion 51 is provided on a concentric circle with the central axis of the coil frame 41 as the center. On the other hand, guided portions 52 are formed at a plurality of locations corresponding to the respective guide portions 51 in the holding portion 20b. The guided portion 52 is an axial guide hole formed in the holding portion 20b, and the guide portion 51 is inserted therein. The brake pad 20 may be guided along an axial groove (or protrusion) provided on the shaft of the hoisting machine. In this case, the shaft is extended toward the brake pad 20, and a protrusion (or groove) to be inserted into the groove (or protrusion) of the shaft is formed in the brake pad 20.

  Here, in the elevator in which the hoisting machine brake device 1 is mounted, for example, at the time of installation or inspection of the elevator, the respective flat portions of the friction material 20a of the brake disk 10 and the brake pad 20 ( The operator adjusts the distance (brake gap) between the contact surfaces. This is because if the brake gap is too large, the collision noise when the brake disc 10 and the brake pad 20 come into contact with each other will increase. On the other hand, when the brake gap is too small, the collision noise can be reduced, but the brake gap is narrowed due to the influence of temperature change or the like, which may hinder the normal operation of the hoisting machine brake device 1. Therefore, the hoisting machine brake device 1 is provided with the interval adjusting member 4 for adjusting the brake gap to the reference set value. The reference set value is, for example, the maximum value of the brake gap within a range where the collision sound satisfies the noise standard (legal standard or manufacturer standard). Therefore, the brake gap should be as large as possible.

  In this example, a screw member is used as the interval adjusting member 4. Hereinafter, the spacing adjusting member 4 is referred to as a “spacing adjusting bolt 4”. The distance adjusting bolt 4 has a male screw portion screwed into a female screw portion of a fixing member on the back side of the holding portion 20b of the brake pad 20, and a tip portion that is one end of the male screw portion on the back surface of the holding portion 20b. Arrange for contact. The fixing member is a member that does not move relative to the electric motor 101. Here, the coil frame 41 arrange | positioned at the back side of the holding | maintenance part 20b is utilized.

  The distance adjusting bolt 4 has a tip portion that is one end protruding from the front side of the coil frame 41 toward the brake pad 20 side, and a head portion that is the other end protruding to the back side of the coil frame 41. The spacing adjustment bolt 4 moves forward toward the electric motor 101 when the operator rotates the head to one side with a tool such as a wrench, and moves away from the electric motor 101 by rotating the head to the other side. To retreat. Further, when the electromagnetic coil portion 40 is energized, the gap adjusting bolt 4 is brought into contact with the back surface of the holding portion 20b at the tip, and the back surface is attracted to the electromagnetic coil portion 40 (strictly speaking, the attraction force-elastic member). It is made to project to the brake pad 20 side so that the tip can be pressed by the elastic force of 30). Therefore, when the electromagnetic coil unit 40 is energized, the brake pad 20 can be brought closer to the brake disk 10 by moving the gap adjusting bolt 4 forward, and the brake pad can be moved backward by moving the gap adjusting bolt 4 backward. 20 can be separated from the brake disc 10. Thus, in the hoisting machine brake device 1, the brake gap can be adjusted by the distance adjusting bolt 4. The brake gap is adjusted while the electromagnetic coil unit 40 is not energized. Then, whether or not the brake gap is correctly adjusted can be confirmed by energizing the electromagnetic coil unit 40.

  As shown in FIG. 3, in the illustrated distance adjusting bolt 4, the contact portion between the front end portion and the back surface of the holding portion 20 b is the central axis (the central position of the brake pad 20, and the central position of the friction material 20 a). A plurality of them are arranged at equal intervals on a concentric circle centering on the center. Specifically, the respective spacing adjustment bolts 4 are arranged with respect to the coil frame 41 at substantially equal intervals radially with respect to the central axis. And these space | interval adjustment bolts 4 are arrange | positioned on the concentric circle centering on the central axis, and arrange | position so that an axis line may become parallel with respect to an axial direction. Thereby, the contact part of a front-end | tip part and the back surface of the holding | maintenance part 20b is located on the concentric circle centering on a central axis at equal intervals. Here, four spacing adjustment bolts 4 are illustrated.

  With the arrangement of the respective spacing adjustment bolts 4, the hoisting machine brake device 1 can move the brake pad 20 in the well-balanced axial direction with the respective spacing adjustment bolts 4. The flat portions of the brake disc 10 and the holding portion 20b can be kept parallel to each other. That is, the hoisting machine brake device 1 can adjust the brake gap with high accuracy while suppressing the occurrence of the inclination of the brake pad 20 with respect to the flat portion of the brake disc 10. Therefore, in the hoisting machine brake device 1, the brake disc 10 and the friction material 20 a of the brake pad 20 can be brought into surface contact with each other when deenergized, so that the brake pad 20 can be prevented from coming into contact with each other. Further, since it is possible to realize the prevention of the one-piece contact, the hoisting machine brake device 1 can avoid the local heat generated due to the partial collision of the brake pad 20, so that the brake torque can be stabilized. In addition, the wear resistance of the brake disc 10 and the brake pad 20 can be improved. Further, the hoisting machine brake device 1 allows the plane portions of the brake disc 10 and the holding portion 20b to be parallel to each other during the adjustment work of the brake gap by the arrangement of the distance adjusting bolts 4 as described above. Thus, the work of adjusting the brake gap can be made more efficient.

  Here, in this illustration, four interval adjustment bolts 4 are provided, but it is preferable to provide at least three interval adjustment bolts 4 in order to obtain the effect of suppressing the inclination. In addition, the distance adjusting bolt 4 of this example is arranged so that its axis is parallel to the axial direction, but it may be arranged on the coil frame 41 with its axis inclined with respect to the axial direction.

  According to the embodiment described above, the adjustment of the brake gap to the reference set value can be performed by the interval adjusting bolt 4. For this reason, according to the present embodiment, it is possible to individually cope with deviations from the reference set value of the brake gap due to processing errors and assembly errors of various components of the hoisting machine brake device 1. Therefore, according to this embodiment, since the deviation of the brake gap at the time of installation or replacement of the hoisting machine brake device 1 having individual differences can be finely adjusted, the reliability of the hoisting machine brake device 1 can be improved. Brake performance can be improved. Furthermore, according to the present embodiment, since the brake gap can be adjusted, for example, the brake pad 20 is not sufficiently opened, and it is possible to prevent the car from moving up and down while the brake disk 10 and the friction material 20a are in contact with each other. it can. Therefore, according to the present embodiment, it is possible to avoid the generation of smoke due to heat generation from the contact portion, and it is possible to avoid a shortage of braking force due to wear of the brake disk 10 and the friction material 20a.

  Further, the distance adjusting bolt 4 facilitates the adjustment work of the brake gap to the reference set value. Here, there is a possibility that the brake gap may deviate from the reference set value due to the influence of time-dependent changes such as wear associated with use and expansion / contraction of members (brake disc 10, brake pad 20, etc.) due to temperature changes. According to the present embodiment, since the adjustment work of the brake gap to the reference set value is easy, the work time can be shortened. Therefore, it can be said that this embodiment is useful when checking the elevator.

  By the way, in this hoisting machine brake device 1, when not energized, the brake pad 20 is pressed against the brake disk 10 by the elastic force of the elastic member 30, and the tip of the distance adjusting bolt 4 is the back surface of the holding portion 20 b. Away from. And when raising / lowering a cage | basket | car, the control part 2 supplies with electricity to the electromagnetic coil part 40, and separates the brake pad 20 from the brake disc 10. FIG. At this time, the brake pad 20 moves until the rear surface of the holding portion 20b hits the tip of the distance adjusting bolt 4 (that is, until the brake gap adjusted by the distance adjusting bolt 4 is reached). For this reason, in the hoisting machine brake device 1, there is a risk of causing noise and vibration when the back surface of the holding portion 20 b hits the tip of the distance adjusting bolt 4. There is also a possibility that the durability of the adjusting bolt 4 may be reduced.

  Therefore, in order to improve such an inconvenience, in this example, the interval adjusting bolt 4 is formed of a material capable of buffering a collision sound such as a resin or a metal powder mixed resin. As a result, the hoisting machine brake device 1 can soften the collision sound when the rear surface of the holding portion 20b and the tip of the distance adjusting bolt 4 hit each other, and suppress the occurrence of vibrations at that time. You can also. Accordingly, the hoisting machine brake device 1 can improve the durability of the brake disc 10 and the distance adjusting bolt 4. Furthermore, the mitigation of the collision noise and vibration contributes to the elimination of discomfort for residents and elevator users near the hoisting machine 100. This is because the living room may be adjacent to the machine room or hoistway in which the hoisting machine 100 is stored, and residents in the living room may feel uncomfortable if a collision sound or vibration occurs every time power is applied. Because I remember. Further, in the machine room-less elevator, the hoisting machine 100 is installed in the hoistway on the uppermost floor or the lowermost floor. Therefore, when an elevator user or the like in front of the landing door generates a collision sound or vibration every time energization occurs. This is because they feel uncomfortable.

  On the other hand, depending on the specifications and installation environment of the elevator, the brake disc 10 may become high temperature or the ambient temperature of the distance adjusting bolt 4 may become high temperature. In this case, the distance adjusting bolt 4 made of a resin material may be deformed by heat. For this reason, in order to prevent deformation due to heat as much as possible, the gap adjusting bolt 4 can be molded using a thermosetting resin such as an epoxy resin or a urethane resin rather than a thermoplastic resin such as plastic among resin materials. preferable. According to the distance adjusting bolt 4 made of this thermosetting resin, the durability of the distance adjusting bolt 4 can be further improved.

  Further, in the hoisting machine brake device 1, a locking member (not shown) may be provided for preventing the distance adjusting bolt 4 from turning after adjusting the brake gap. As this locking member, for example, a female screw member such as a nut screwed into the male screw portion of the distance adjusting bolt 4 can be considered. The female screw member is tightened toward the front surface, the back surface, or both of the coil frame 41. Therefore, since the distance adjusting bolt 4 is fixed to the coil frame 41 so as not to loosen, for example, it is possible to suppress a change from the reference set value of the adjusted brake gap. In addition, a folding washer may be used as the locking member.

[Modification 1]
In the above-described embodiment, the brake pad 20 in which the friction material 20a and the holding portion 20b are both formed in a disk shape is illustrated. For this reason, in the embodiment, the contact portion between the tip of the distance adjusting bolt 4 and the back surface of the brake pad 20 (the back surface of the holding portion 20b) is equidistant on a concentric circle centering on the central axis. A plurality of interval adjusting bolts 4 are arranged. On the other hand, in the brake device 1 for hoisting machines of this embodiment, the brake pad 20 can be replaced with a variety of shapes. For example, in this hoisting machine brake device 1, it is possible to apply the brake pad 21 (FIG. 4) in which the friction material 21 a is formed in a rectangular plate shape. In the brake pad 21, the holding portion 21b is also formed into a rectangular plate shape.

  Also in this rectangular brake pad 21, the plurality of interval adjusting bolts 4 have a central axis (the brake pad 21 and the friction material 21 a) at the contact portion between the tip portion and the back surface of the brake pad 21 (the back surface of the holding portion 21 b). It is desirable to arrange them so as to be equidistant on a concentric circle centering on the center position. This is because this arrangement makes it possible to adjust the brake gap with high accuracy while suppressing the occurrence of the inclination of the brake pad 21 with respect to the flat portion of the brake disc 10, and the same effects as those of the above-described embodiment can be obtained.

  Here, the brake pad 21 is formed by forming the friction material 21a and the holding portion 21b into a square plate shape. For this reason, as shown in FIG. 4, the four spacing adjusting bolts 4 have respective intersections between the concentric circles where the contact portions are arranged and the two diagonal lines of the brake pad 21 (the friction material 21a and the holding portion 21b). It is also possible to arrange so that the abutting part is located on the surface. That is, in the four spacing adjusting bolts 4, the contact portion between the tip end portion and the back surface of the brake pad 21 (the back surface of the holding portion 21b) sandwiches the central axis (the center position of the brake pad 21 and the friction material 21a). However, they are arranged on the two diagonal lines of the friction material 21a and equidistant from the central axis. Also by this arrangement, it is possible to obtain the same effects as those of the above-described embodiment.

  About the arrangement | positioning on the diagonal of this space | interval adjustment volt | bolt 4, it can apply to the brake pad by which the friction material was shape | molded at least at rectangular plate shapes, such as a square and a rectangle. This arrangement can also be applied to a brake pad in which a friction material is formed in a polygonal plate shape such as a regular pentagon or a regular hexagon. Therefore, the plurality of gap adjusting bolts 4 have a contact portion between the tip portion and the back surface of the brake pad (the back surface of the holding portion) with the center axis (the center position of the brake pad or friction material) sandwiched between the brake pads. What is necessary is just to arrange | position so that it may become equidistant from the said central axis on at least 2 diagonal. Each spacing adjustment bolt 4 may be determined in consideration of the shape of the brake pad (particularly the friction material) as to whether it is arranged on the concentric circle or on the diagonal line.

[Modification 2]
In the hoisting machine brake device 1 according to the above-described embodiment, the brake pad 20 can be replaced with a split structure including a plurality of brake pads. For example, FIG. 5 shows an example in which the rotation of one brake disk 10 is held in a stopped state by two brake pads 22 and 23. The brake pads 22 and 23 are formed by forming the friction materials 22 a and 23 a and the holding portions 22 b and 23 b into a rectangular plate shape, and are arranged uniformly with respect to the center of the brake disk 10. Therefore, in the brake pad 22, the contact portion between the tip end portion of the distance adjusting bolt 4 and the back surface of the brake pad 22 (the back surface of the holding portion 22b) sandwiches the central axis (the center position of the brake pad 22 and the friction material 22a). The four spacing adjusting bolts 4 are arranged so as to be equidistant from the central axis on two diagonal lines of the friction material 22a. Also in the brake pad 23, the four space | interval adjustment bolts 4 are arranged similarly. Thereby, in each brake pad 22 and 23, it becomes possible to adjust the brake gap with high accuracy while suppressing the occurrence of the inclination of the brake pad 22 and 23 with respect to the flat surface portion of the brake disc 10, and the above-described embodiment. Similar effects can be obtained.

[Modification 3]
In the above-described embodiment, the interval adjusting bolt 4 is formed of resin in order to reduce the collision noise and vibration between the brake pad 20 and the interval adjusting bolt 4 when energized. However, even if a thermosetting resin is used, it is difficult to completely eliminate the influence of the heat accompanying the temperature change with the gap adjusting bolt 4, and there is a risk of causing a shift in the brake gap and a decrease in durability. For this reason, it is desirable that the distance adjusting bolt 4 is made of metal.

  Therefore, in the hoisting machine brake device 1 according to the above-described embodiment, a buffer portion is provided on at least one of the rear surface of the holding portion 20b or the front end portion of the metal spacing adjustment bolt 4. FIG. 6 is an example in which a buffer portion 5 </ b> A is provided at the tip of the metal spacing adjustment bolt 4. The buffer portion 5A is formed in a columnar shape from a resin material such as a thermoplastic resin, a metal powder mixed resin, or a thermosetting resin, and is adhesively fixed to the tip end portion of the distance adjusting bolt 4 with an adhesive. Moreover, this buffer part 5A may be crimped and fixed to the tip part. By providing the buffer portion 5A in this way, the hoisting machine brake device 1 can suppress the brake gap deviation due to temperature change and improve the durability of the distance adjusting bolt 4, while maintaining the brake pad 20 during energization. Since the collision noise and vibration with the distance adjusting bolt 4 can be mitigated, the reliability and brake performance can be improved.

  Furthermore, the buffer part may be fitted into a groove part (not shown) formed at the tip part of the distance adjusting bolt 4, for example, and its own groove part is fitted into the tip part. Also good. FIG. 7 shows an example of the latter. The latter buffer portion 5B is formed in a columnar shape from a resin material such as a thermoplastic resin, a metal powder mixed resin, or a thermosetting resin, and has a groove portion into which the tip of the distance adjusting bolt 4 is inserted. . As described above, when the buffer portion 5B is fitted, only the buffer portion 5B needs to be replaced at the time of wear or the like, and it is not necessary to replace the distance adjusting bolt 4.

  Here, the gap adjusting bolt 4 having the buffer portions 5A and 5B can be applied to the hoisting machine brake device 1 of the first and second modifications.

[Modification 4]
In the above-described embodiment, the respective spacing adjustment bolts 4 are arranged so as to be shifted with respect to the elastic member 30. In this illustration, in the hoisting machine brake device 1 of the embodiment, as shown in FIGS. 8 and 9, the elastic member 30 is a coil spring, and the distance adjusting bolt 4 is disposed inward (center of the axis) of the coil spring. Deploy. That is, here, the distance adjusting bolt 4 and the elastic member 30 are arranged concentrically. Therefore, a female thread portion concentric with the holding groove 41 a of the elastic member 30 is screwed into the coil frame 41. As a result, the hoisting machine brake device 1 has a high degree of freedom in arrangement of components such as the distance adjusting bolt 4, the elastic member 30, and the electromagnetic coil 42, and enables efficient arrangement of the components. Therefore, the space for arranging the electromagnetic coil 42 can be widened. Further, in the hoisting machine brake device 1, the coil frame 41 can be reduced in size, and the entire device can be reduced in size. For this reason, this hoisting machine brake device 1 also leads to downsizing of the hoisting machine 100, and the degree of freedom of arrangement of the hoisting machine 100 in the machine room or hoistway increases. Therefore, the hoisting machine brake device 1 also contributes to the design freedom of the layout of the building in which the elevator is installed.

  Here, the arrangement of the gap adjusting bolt 4 can also be applied to the hoisting machine brake device 1 of Modification 1-3 described above.

[Modification 5]
In the hoisting machine brake device 1 according to the above-described embodiment or modification 1-4, the distance adjusting bolt 4 is provided with a load detection unit (not shown) such as a strain gauge or a piezoelectric element that can detect a load in the axial direction. It may be arranged and used as a load cell. The load detection unit detects a load applied to the distance adjusting bolt 4 from the brake pad 20 (21, 22, 23). Therefore, when applying a strain gauge, it arrange | positions on the axis | shaft of the space | interval adjustment bolt 4, and arrange | positions at the front-end | tip part of the space | interval adjustment bolt 4 when applying a piezoelectric element. The control unit 2 can obtain a force (opening force) when the brake pad 20 (21, 22, 23) is separated from the brake disk 10 during energization by receiving the detection signal of the load detection unit. The opening force is the same as a value obtained by subtracting the elastic force of the elastic member 30 from the attractive force of the electromagnetic coil unit 40.

  In this modified example 5, when the release force is not detected or the release force is extremely small, the control unit 2 determines that the brake is not sufficiently released, and stops the elevator service (that is, operation). Let The case where the opening force is not detected is a state in which the brake pad 20 (21, 22, 23) is not in contact with the tip end portion of the distance adjusting bolt 4. For example, the brake gap is narrower than the reference set value. The state which is present can be considered. In addition, when the opening force is extremely small, the brake pad 20 (21, 22, 23) is in contact with the tip of the distance adjusting bolt 4, but the load is as large as when the brake gap is the reference set value. For example, a state where the brake gap may be narrower than the reference set value in the future due to a decrease in the attractive force of the electromagnetic coil unit 40 is conceivable. For example, the control unit 2 stops the elevator when the detected opening force falls below a predetermined threshold. As the threshold value, for example, an opening force in a state where a decrease in the attractive force of the electromagnetic coil unit 40 is suggested may be set. By executing such control, the hoisting machine brake device 1 can cause the control unit 2 to grasp that the brake is correctly released to the brake gap of the reference set value. In spite of the time, the brake disk 10 and the brake pad 20 (21, 22, 23) are in contact with each other, and it is possible to avoid a situation in which heat generation and wear due to the dragging occur. Therefore, this hoisting machine brake device 1 can improve reliability and brake performance.

  Here, just because the opening force once falls below the threshold value does not necessarily cause a decrease in the attractive force of the electromagnetic coil unit 40 or the like. For example, the guide part 51 and a part of the guided part 52 of the brake pad 20 (21, 22, 23) are accidentally caught, and the movement of the brake pad 20 (21, 22, 23) is temporarily poor. This is because a situation such as For this reason, it is preferable that the control unit 2 repeats the comparison determination between the detected opening force and a predetermined threshold at an interval. For example, when the detected opening force falls below a predetermined threshold, the control unit 2 may stop the elevator once and determine whether the elevator is finally stopped or restarted based on the result of the comparison determination again. Further, when the detected opening force falls below a predetermined threshold, the control unit 2 waits for another comparison determination while operating the elevator, and determines whether or not it is necessary to finally stop the elevator based on the result. May be.

  According to the embodiment and the modification example 1-5 described above, by providing the distance adjusting bolt 4 in the hoisting machine brake device 1, the workability of adjusting the brake gap and the maintenance of the hoisting machine brake device 1 are maintained. Workability, performance and reliability can be improved. According to this embodiment and Modification 1-5, the hoisting machine brake device 1 can continue to operate normally by adjusting the correct brake gap, so that a safe and safe service for elevator users is provided. Can be continuously provided.

  By the way, this hoisting machine brake device 1 is a one-push type (that is, a method in which the brake pad 20 (21, 22, 23) is pressed only on one side of the brake disk 10) in the above-described embodiment or modification 1-5. However, the present invention can also be applied to a system in which the brake disc 10 is sandwiched between the brake pads 20 (21, 22, 23) from both sides. Even in this case, the various effects described above can be produced in the same manner.

  As mentioned above, although embodiment and the modification regarding this invention were demonstrated, this embodiment and the modification are shown as an example and are not intending limiting the range of invention. This embodiment and modification can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Brake device for hoisting machine 2 Control part 3 Drive part 4 Space | interval adjustment bolt (space | interval adjustment member)
5A, 5B Buffer 10 Brake disc (rotating member)
20, 21, 22, 23 Brake pad (locking member)
20a, 21a, 22a, 23a Friction material 20b, 21b, 22b, 23b Holding part 30 Elastic member 40 Electromagnetic coil part 41 Coil frame 100 Hoisting machine 101a Drive shaft 101 Electric motor

Claims (5)

A brake disk that rotates together with the rotation of the drive shaft of the electric motor in the hoist for raising and lowering the elevator car;
A brake pad having a flat portion opposed to the flat portion of the brake disc, and capable of stopping the brake disc when the flat portions are in contact with each other;
A drive portion for engaging the brake pad with the brake disc so that the flat portions abut against each other, and driving the brake pad away from the brake disc;
A control unit for controlling the operation of the brake pad by the driving unit;
An interval adjusting member that moves the brake pad in the engaging direction and the separating direction in a state in which a tip portion is in contact with the back surface of the brake pad, and adjusts an interval between the plane portions;
A buffer provided on at least one of the rear surface of the brake pad or the tip of the spacing adjustment member;
A brake device for a hoisting machine, comprising:   The spacing adjusting member is arranged such that the contact portion with the rear surface of the brake pad is arranged at equal intervals on a concentric circle centered on the center position of the brake pad, or the contact portion is positioned at the center position of the brake pad. 2. The brake device for a hoisting machine according to claim 1, wherein a plurality of brake devices are provided so as to be arranged on at least two diagonal lines of the sandwiched brake pad and equidistant from the center position.   The hoisting machine brake device according to claim 1 or 2, wherein the buffer portion is adhesively fixed, crimp-fixed, or fitted and fixed to an end of the distance adjusting member on the brake pad side.   The drive unit includes a coil spring that applies a resilient force in the engagement direction to the back surface of the brake pad, and the interval adjusting member is disposed at the axial center of the coil spring. The brake device for a hoist according to 2 or 3.   A load detection unit that detects a load from the brake pad to the gap adjusting member is provided, and the control unit detects the load detection unit when the brake pad and the brake disk are controlled to be in a separated state. The hoisting machine brake device according to claim 1, 2, 3, or 4, wherein the elevator is stopped when the value is smaller than a predetermined threshold value.

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