EP2452911B1 - Braking device for elevator hoist - Google Patents

Braking device for elevator hoist Download PDF

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Publication number
EP2452911B1
EP2452911B1 EP10796857.0A EP10796857A EP2452911B1 EP 2452911 B1 EP2452911 B1 EP 2452911B1 EP 10796857 A EP10796857 A EP 10796857A EP 2452911 B1 EP2452911 B1 EP 2452911B1
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EP
European Patent Office
Prior art keywords
drum
braking
braking device
iron core
movable iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10796857.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2452911A4 (en
EP2452911A1 (en
Inventor
Tomokazu Hoshinoo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2452911A1 publication Critical patent/EP2452911A1/en
Publication of EP2452911A4 publication Critical patent/EP2452911A4/en
Application granted granted Critical
Publication of EP2452911B1 publication Critical patent/EP2452911B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • B66B11/04—Driving gear ; Details thereof, e.g. seals
    • B66B11/08—Driving gear ; Details thereof, e.g. seals with hoisting rope or cable operated by frictional engagement with a winding drum or sheave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
    • B66D5/08—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying blocks or shoes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02—Driving gear
    • B66D1/12—Driving gear incorporating electric motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/30—Operating devices electrical

Definitions

  • the present invention relates to a braking device that is provided to a hoist for deriving an elevator.
  • a braking device for an elevator hoist of the related art adopts an internal expansion direct-acting electromagnetic brake, as disclosed in Patent Document 1.
  • a fixed iron core and a movable iron core are provided in a drum
  • a brake shoe is attached to the movable iron core via two coupling members
  • the coupling members are screw-threaded in screw holes of the movable iron core so that they can be moved forward-and-backward and be adjusted in a screw manner, and are fixed with lock nuts.
  • the braking device is adapted to press and separate a frictional member of the brake shoe to and from an inner peripheral surface of the drum, thereby braking and opening the drum.
  • a gap that is formed when the frictional member and the drum are separated is adjusted by adjusting protruding lengths of the coupling members from the movable iron core.
  • WO9853217 shows a braking device according to the state of the art.
  • Patent Document 1 JP 2002-284486A (page 6 and FIG. 2 )
  • a maintenance-man when adjusting the gap in the routine maintenance, measures the gap between the frictional member and the drum of the braking device. Then, when the measured gap deviates from a prescribed value, the maintenance-man loosens the lock nuts of the coupling members,and then the respective coupling members is moved forward-and-backward in a screw manner so that the gap belongs to the prescribed value, thereby adjusting the protruding lengths of the coupling members from the movable iron core. At this time, the maintenance-man adjusts the lengths of the coupling members so that the gap is substantially uniform. Accordingly, the gap adjustment is troublesome and requires much time.
  • An object of the present invention is to provide a braking device for an elevator hoist capable of easily adjusting a gap between a frictional member and a drum.
  • a braking device of an elevator hoist of the present invention includes a housing that accommodates a rotatable drum therein and has an opening section having one end and other end opened; a pivoting member that is pivotably provided to the one end of the opening section and has the other end opened; a fastening and releasing member that fastens and releases the other end of the pivoting member to and from the other end of the opening section; an adjusting unit that adjusts a distance between the other end of the pivoting member and the other end of the opening section, with being fastened to the pivoting member; a braking section that is provided to the pivoting member and presses the drum, and a braking drive unit that is provided to the pivoting member and is pressed and separated to and from an outer peripheral surface of the drum.
  • the gap is adjusted by the adjusting unit and then the pivoting member is fastened to the housing by the fastening and releasing member.
  • the braking device of an elevator hoist of the present invention preferably includes: a frictional member is provided on a surface of the a braking section; and a pressing correction unit to press the frictional member so that the frictional member is uniformly pressed to the drum when pressing the frictional member to the drum.
  • the frictional member can be tightly pressed to the drum over its entire surface by the pressing correction unit. Accordingly, it is possible to increase the braking force of the braking device.
  • the braking device of an elevator hoist of the present invention preferably includes: a rotatable drum; a braking section that is mounted to contact and separate from an outer peripheral surface of the drum; a drive section that presses the braking section to the outer peripheral surface of the drum and separates the braking section from the outer peripheral surface of the drum; a pivoting member to which the drive section is provided; a first attachment part that is adapted to pivotably mount one end of the pivoting member and is mounted around the drum; a second attachment part that is adapted to fasten and release the other end of the pivoting member and is mounted around the drum, and a distance adjusting unit that adjusts a distance between the other end of the pivoting member and the second attachment part, with the other end of the pivoting member being fastened to the second attachment part.
  • the braking device since the one end of the pivoting member is attached to the first attachment part so that it can be pivoted, a distance between the other end of the pivoting member and the second attachment part is changed as the pivoting member is pivoted. Based on the distance, a gap between the braking section and the drum is changed in the separated state of the braking section and the drum.
  • the first attachment part has a hole
  • the pivoting member has a hole at the one end
  • the braking device includes a shaft member that is inserted into the hole of the first attachment part and the hole of the one end of the pivoting member.
  • the pivoting member when the fastened state is released to release the pivoting member from the second attachment part, the pivoting member is pivoted about the shaft member of the first attachment part serving as a supporting point. Accordingly, it is possible to pivot the pivoting member with the simple configuration.
  • one of hole of the first attachment part and the hole of the one end of the pivoting member is a screw hole, and the shaft member is screw-threaded into the screw hole.
  • the one end of the pivoting member is fixed to the first attachment part by the screw-threaded shaft member and the other end of the pivoting member is fastened to the second attachment part.
  • the pivoting member can be pivoted about the shaft member serving as a supporting point.
  • both ends of the pivoting member are securely fixed to the first attachment part and the second attachment part, it is possible to easily press the braking section to the outer peripheral surface of the drum.
  • the braking device for example, it is possible to pivot or fix the pivoting member by loosening or tightening the screw thread engagement of the shaft member. Accordingly, it is possible to easily adjust the pivoting position of the pivoting member.
  • the distance adjusting unit has a distance adjusting member having a thickness, and the other end of the pivoting member is fastened to the second attachment part via the distance adjusting member.
  • the gap between the braking section and the drum with the braking section and the drum being separated is determined depending on the thickness of the distance adjusting member. Accordingly, it is possible to easily adjust the gap with the braking section and the drum being separated by adjusting the thickness of the distance adjusting member.
  • two of distance adjusting members are alternately disposed side by side in a rotating axis center direction of the drum.
  • this braking device when the two of distance adjusting members having different thickness are alternately disposed side by side in a rotating axis center direction of the drum between the second attachment part and the other end of the pivoting member, it is possible to uniformly adjust the gap between the braking section and the drum in the rotating axis center direction with the braking section and the drum being separated.
  • the distance adjusting unit has: a hole that is provided to the other end of the pivoting member; a screw hole that is provided to the second attachment part a bolt that is inserted into the hole and is screw-threaded into the screw hole so that it can be moved forward-and-backward; a first nut that is screw-threaded on the bolt and is fixed on a surface of the other end of the pivoting member facing the second attachment parts; and a second nut that is screw-threaded on the bolt and fixes the bolt to the second attachment part.
  • this braking device when the distance between the other end of the pivoting member and the second attachment part is changed by tightening or loosening the bolt inserted into the hole of the other end of the pivoting member with the bolt being screw-threaded into the screw hole of the second attachment part, the gap between the braking section and the drum with the braking section and the drum being separated is changed depending on the distance. Then, the pivoting member is fixed to the bolt by the first nut and the bolt is fixed to the second attachment part by the second nut, so that the gap is fixed. Accordingly, since it is possible to continuously change the gap between the braking section and the drum with the braking section and the drum being separated by tightening or loosening the bolt, it is possible to easily adjust the gap.
  • the braking device for an elevator hoist of the present invention, preferably, the braking device includes a pivot-preventing unit that prevents the pivoting member from being pivoted in a state in which the fastened state of the other end of the pivoting member to the second attachment part is released.
  • the drive section has a first elastic member that is provided to the pivoting member; an electromagnetic coil that is provided to the pivoting member; a movable iron core that urges the braking section to the outer peripheral surface of the drum by the first elastic member at a non-excitation state of the electromagnetic coil and separates the braking section from the outer peripheral surface of the drum against the urging force of the first elastic member at an excited state of the electromagnetic coil, a guide unit that slidingly guides the movement of the movable iron core.
  • the guide unit has a first member that is fixed to the pivoting member and a second member that is provided around the first member and is elastically deformed more easily than the first member, and the movable iron core slidingly moves along the second member.
  • the movable iron core slides along the second member that is provided around the first member fixed to the pivoting member and is easily elastically-deformed.
  • the movable iron core can flexibly change the posture thereof, it can slide without being caught at the first member.
  • the guide unit the first member, which has a rod shape, fixed to a surface of the pivoting member facing the drum and has a first recess of a ring shape at a leading end thereof: and the second member, which has an elastic ring shape, fitted to the first recess and has a protrusion to slidingly guide the movement of the movable iron core.
  • the movable iron core is provided with a concave portion into which the first member and the second member can be inserted. When the movable iron core is moved, an inner peripheral surface of the concave portion and the second member slide.
  • the movable iron core slides along the second member having an elastic ring shape fitted in the first recess of the first member fixed to the pivoting member.
  • the movable iron core can flexibly change the posture thereof even when the axis center of the first member and the axis center of the concave portion of the movable iron core are deviated due to the manufacturing errors, the movable iron core can slide without being caught at the first member.
  • the guide unit has: the first member, which has a rod shape, fixed to a surface of the pivoting member facing the drum and has a first recess of a ring shape at a leading end thereof; and the second member, which has an elastic ring shape, fitted to the first recess and has a protrusion to slidingly guide the movement of the movable iron core.
  • the movable iron core is provided at four corners thereof with third circular recesses that can be engaged to the protrusions of the second members. When the movable iron core is moved, the second members slide along the third recesses.
  • the movable iron core slides along the second members of an elastic ring shape fitted in the second recesses of the first members fixed to the pivoting member.
  • the movable iron core can flexibly change the posture thereof even when the axis centers of the first members and the axis centers of the third recesses of the movable iron core are deviated due to the manufacturing errors, the movable iron core can slide without being caught at the first members.
  • the braking section has: a frictional member that is provided to face the outer peripheral surface of the drum; and a correction unit that is provided to uniformly press a braking surface of the frictional member to the outer peripheral surface of the drum and to uniform a gap between the braking surface of the frictional member and the outer peripheral surface of the drum.
  • the correction unit presses substantially and uniformly the braking surface of the frictional member to the outer peripheral surface of the drum.
  • the gap between the braking surface of the frictional member and the outer peripheral surface of the drum is substantially uniform.
  • the correction unit has: a spherical band seat that has a spherical band portion and a pillar portion contacting the movable iron core; a spherical crown seat that has a concave spherical crown portion to be engaged with the spherical band portion; a plate member that contacts the spherical crown seat and to which the frictional member is fixed; and a second elastic member that has a leading end communicating with a base portion, wherein the base portion is fixed to the movable iron core and the leading end presses the plate member to urge the plate member toward the movable iron core.
  • a position at which the leading end of the second elastic member presses the plate member is near a virtual line that is formed as a virtual plane including a rotating axis center of the drum and a center of the spherical band portion of the spherical band seat intersects with a surface of the plate member facing the drum.
  • this braking device when the frictional member is pressed to the drum, the engaged position of the spherical band seat and the spherical crown seat is deviated, and the second elastic member is deformed. Thus, the directions of the frictional member and the plate member facing the outer peripheral surface of the drum are changed, and the braking surface of the frictional member is tightly contacted to the outer peripheral surface of the drum, so that the frictional member presses uniformly.
  • the second elastic member presses the plate member toward the movable iron core, the position at which the plate member is pressed is near the part at which the plate member is supported to the spherical band seat.
  • the force by which the second elastic member changes the posture of the plate member is small. Therefore, even when the frictional member is separated from the drum, the plate member is separated from the drum with the substantially same posture as that in the pressed state. As a result, the gap between the frictional member and the drum is substantially uniform.
  • the gap is substantially uniform, so that it is possible to easily adjust the gap to the prescribed value.
  • a braking device for an elevator hoist capable of easily adjusting a gap between a frictional member and a drum.
  • FIG. 1 is an overall configuration view of a braking device for an elevator hoist according to an illustrative embodiment of the present invention.
  • FIG. 2 is a view illustrating a state in which arms of the braking device shown in FIG. 1 are opened.
  • FIG. 3 is a view seen from an arrow III-III direction of FIG. 1 , illustrating a state at the time of brake releasing.
  • FIG. 4 is a view seen from an arrow IV-IV direction of FIG. 1 , illustrating a state at the time of brake braking.
  • a braking device 1 for an elevator hoist is symmetrically formed in the left-right direction while sandwiching a drum 5.
  • the braking device 1 includes the rotatable drum 5 coupled to a rotor of a motor and a housing 7 that accommodates the drum 5 therein and has opening sections 7a, which has one end and the other end, opened at both sides.
  • the braking device 1 has arms 11 as pivoting member and braking drive sections 30, which is provided to the arms 11, to press and separate frictional members 69 to and from an outer peripheral surface of the drum 5.
  • the arm 11 is pivotably coupled to one end of the opening section 7a of the housing 7 by a pin 9, and the arm 11 is coupled and fixed to the other end of the opening section 7a of the housing via a spacer 15 as an adjustment unit for adjusting a distance by a bolt 13 as a fastening and opening member.
  • a jack bolt may be provided to a screw hole formed at the other end portion of the arm 11, instead of the spacer 15.
  • the arm 11, the spacer 15, the bolt 13, the pin 9 and the braking drive section 30 are respectively provided one by one to right and left sides.
  • a gap between the frictional member 69 and the drum 5 is changed depending on a thickness of the spacer 15.
  • a distance X from the pin 9 that is a pivoting center of the arm 11 to the fastening part of the bolt 13 is greater than a distance Y from the pin 9 to a center of a longitudinal direction of the arm 11.
  • the braking drive section 30 is provided to the arm 11 and has a braking section 50 that brakes the drum 5 and a drive section 70 having a movable iron core 72 that translationally moves the braking section 50 and presses and separates one end surface of the braking section 50 to and from the outer peripheral surface of the drum 5.
  • the braking section 50 is coupled and fixed to the movable iron core 72 and has a pressing correction section 60 as a pressing correction unit and the frictional member 69 that is fixed on a surface of the pressing correction section 60 facing the drum 5. Since a non-uniform gap is formed due to the manufacturing errors between the frictional member 69 and the drum 5 in the opened state of the braking device 1, the pressing correction section 60 is provided so as to uniformly press the frictional member 69 and the drum 5 in the braking state of the braking device 1.
  • the pressing correction section 60 is fixed to the movable iron core 72 and has a spherical band seat 62 that has a spherical band portion, a concave spherical seat 64 having a concave portion that is engaged with the spherical band portion of the spherical band seat 62, and a brake shoe 66 that is fixed on a planar side of the concave spherical seat 64.
  • the pressing correction section 60 has Z-shaped elastic clips 68 that press the brake shoe 66 toward the spherical band seat 62 and are fixed to the movable iron core 72 by screws 67 and the frictional member 69 that is fixed on a surface of the brake shoe 66 facing the drum 5.
  • the drive section 70 has the movable iron core 72 that is provided on a surface of the arm 11 facing the drum 5, springs 74 that urge the movable iron core 72 toward the drum 5 and is mounted to the arm 11, and electromagnetic coils 76 that suck the movable iron core 72 toward the arm 11 against the force of the springs 74.
  • the springs 74 are extended to urge the movable iron cores 72 toward the drum 72, so that the frictional members 69 are pressed to the drum 5, as shown in FIG. 4 .
  • the engaged positions of the spherical band seats 62 and the concave spherical seats 64 of the pressing correction sections 60 are deviated to elastically deform the elastic clips 68.
  • the frictional members 69 are tightly pressed to the drum 5 over the entire surface thereof.
  • the maintenance-man After a maintenance-man measures the gap b, the maintenance-man removes the bolt 13 fastened to the housing 7 to pivot the arm 11 about the pin 9 serving as a support point in the arrow A direction, as shown in FIG. 2 . In order to adjust the gap b to a desired value, the maintenance-man replaces a spacer 15 having a predetermined thickness prepared in advance and again fastens the arm 11 to the housing 7 by the bolt 13.
  • the spacer 15 may be singular or plural.
  • the arm 11 When replacing the frictional member 69 of the braking device 1, the arm 11 is pivoted as shown in FIG. 2 . At that state, the screw 67 of the braking section 60 is removed, the elastic clips 68 are detached, the brake shoe 66 is detached and a new brake shoe 66 is attached. Since it is possible to secure a wide operation space, it is possible to easily replace the brake shoe 66 and the like.
  • the braking device 1 for an elevator hoist configured as described above includes the housing 7 that accommodates the rotatable drum 5 therein and has the opened opening sections 7a, the arms 11 each of which is pivotably attached to one end of the opening section 7a and has the other end opened, the bolts 13 each of which fastens and releases the other end portion of the arm 11 to and from the other end of the opening section 7a, the spacers 15 each of which is adapted to adjust the distance between the other end portion of the arm 11 and the other end of the opening section with each spacer 15 being fastened to each arm 11 and the braking drive sections 30 that are provided to the arms 11 and press and separate the braking sections 50 to and from the outer peripheral surface of the drum 5.
  • the spacers 15 are replaced with the spacers 15 having a predetermined thickness prepared in advance and then the arms 11 are again fastened to the housing 7 by the bolts 13.
  • the braking device 1 has the pressing correction section 60 that causes the frictional member 60 of the braking section 50 to be uniformly pressed on the drum 5 when pressing the braking section 50 to the drum 5.
  • the arm 11 as a pivoting member is coupled and fixed to the other end of the opening section 7a of the housing 7 via the spacer 15 by the bolt 13 as a fastening and releasing member.
  • the bolt 13 as a fastening and releasing member.
  • a hoist 182 is mounted in a machine room 181 that is provided at the upper of a hoistway 180.
  • the hoist 182 is provided with a sheave 183 and a braking device 101, and a drum 105 of the braking device 101 and the sheave 183 are integrally rotated by an electromotor.
  • a rope 184 is wound on the sheave 183.
  • a cage 185 is coupled to one end of the rope 184 and a balance weight 186 is coupled to the other end thereof.
  • FIG. 5 is an overall configuration view of the braking device 101 for the elevator hoist 182.
  • FIG. 6 illustrates a state in which arms 111 as pivoting members of the braking device 101 for the elevator hoist 182, are pivoted.
  • the drum 105 is rotatably provided to a holder 103.
  • attachment parts 103a as a first attachment part and attachment part 103b as a second attachment part are provided to the holder 103.
  • the arms 111 are provided at both sides of the drum 105 facing to the outer peripheral surface, which is the braking surface of the drum 105.
  • One end portion of the arm 111 is pivotably mounted to the attachment part 103a and the other end portion is provided to the attachment part 103b via a spacer 115 as a distance adjusting member.
  • a surface of the arm 111 facing the drum 105 is provided with a drive section 170.
  • a surface of the drive section 170 facing the drum 105 is provided with a braking section 150.
  • the braking section 150 is provided with a frictional member 169 via a correction section 161 as a correction unit, and a shoe 166 as a plate member. A braking surface of the frictional member 169 is pressed and separated to and from the outer peripheral surface of the drum 105 by the drive section 170.
  • FIG. 9 is a view seen from an arrow V direction of FIG. 5 .
  • a bolt 112 as a shaft member is inserted into a hole 111a provided to one end portion of the arm 111 and is then screw-threaded into a screw hole 103c provided to the attachment part 103a, so that the arm 111 is fixed to the attachment part 103a.
  • the other end portion of the arm 111 is fixed to the attachment part 103b via the spacer 115 having a thickness t by a bolt 113.
  • a hook 117 as a pivot-preventing unit holds the other end portion of the arm 111 through the bolt 113 so that the arm 111 is not pivoted about the bolt 112 serving as a support point.
  • the arm 111 in order to pivot the arm 111, when a bolt 114, the hook 117 and the bolt 113 are taken off and the bolt 112 is loosened without falling out, the arm 111 can be pivoted about the bolt 112 serving as a support point, as shown in FIG. 6 .
  • the arm 111 can be pivoted about the bolt 112 serving as a support point. Accordingly, when the thickness t of the spacer 115 is changed, the gap g between the frictional member 169 and the drum 105 is changed depending on the thickness t of the spacer 115. In addition, regarding a distance X1 between the bolt 112 that is a pivoting center of the arm 111 and the fastening part of the bolt 113 having sandwiched the spacer 113 and a distance Y1 between the bolt 112 and the center of the frictional member 160, X1 is set to be longer than Y1.
  • dg dt ⁇ Y 1 / X 1 .
  • the braking device 101 is formed so that when the thickness t of the spacer 115 is changed, the gap g is changed less than the change amount of the thickness t.
  • FIGS. 7 and 8 are partially enlarged views of the drive section 170 and the braking section 150.
  • FIG. 7 illustrates a released state of the drum 105
  • FIG. 8 illustrates a braked state of the drum 105.
  • two guide pins 171 each of which has a rod shape, as a first member are fixed to the arm 111 to ward the drum 105.
  • Two recesses 171a each of which has a ring shape, as a first recess are provided to a leading end of the guide pin 171.
  • Rubber rings 173, each of which is an elastic body elastically deformed more easily than the first member, as a second member, are respectively fitted in the recesses 171a.
  • Outer peripheries of the rubber rings 173 more protrude than that of the guide pin 171.
  • a movable iron core 172 is formed with guide holes 172a into which the guide pins 171 having fitted the rubber rings 173 thereto can be inserted.
  • the outer peripheries of the rubber rings 173 are elastically deformed and contacted to inner peripheral surfaces of the guide holes 172a.
  • the movable iron core 172 is formed so that it is elastically supported to the arm 111 via the rubber rings 173 and the guide pins 171 and is slidingly guided along the rubber rings 173.
  • a depth of the guide hole 172a is formed so that the guide pin 171 can be accommodated therein and the movable iron core 172 can be sucked and contacted to the arm 111.
  • Electromagnetic coils 176 having a circumferential shape are provided to a side of the arm 111 facing the movable iron core 172. At the inner sides of the electromagnetic coils 176, springs 174 are provided to stand toward the outer peripheral surface of the drum 105. In FIG. 7 , the electromagnetic coils 176 are excited to suck the movable iron core 172 toward the arm 111 against the urging force of the springs 174, thereby separating the braking section 150 from the drum 105. Therefore, the gap g is formed between the frictional member 169 of the braking section 150 and the outer peripheral surface of the drum 105. In FIG. 8 , the electromagnetic coils 176 are not excited, so that the springs 174 urge the movable iron core 172 to press the braking section 150 toward the drum 105.
  • the braking section 150 is provided with the correction section 161 that corrects a posture of the frictional member 169 when pressing and separating the frictional member 169 to and from the drum 105.
  • the correction section 161 has a shoe 166 to which the frictional member 169 is fixed, a spherical band seat 162, a spherical crown seat 164 and elastic clips 168 as a second elastic member.
  • the spherical band seat 162 is a cylinder member having a spherical band portion and a pillar portion
  • the spherical crown seat 164 is a plate shape member having a concave spherical crown portion and the spherical band portion and the spherical crown portion are engaged.
  • the spherical band seat 162 In the state in which the spherical band seat 162 and the spherical crown seat 164 are engaged, the spherical band seat 162 is contacted to the movable iron core 172 and the spherical crown seat 164 is contacted to the shoe 166, with sandwiching between the movable iron core 172 and the shoe 166.
  • FIG. 11 is a view seen from an arrow VII direction of FIG. 6 and FIG. 13 is a view seen from an arrow VI-VI direction of FIG. 5 .
  • base portions thereof are fixed to the movable iron core 172 by screws 167 and leading ends having a piece shape press the surface of the shoe 166 facing the drum 105, thereby pressing and holding the shoe 166, the spherical crown seat 164 and the spherical band seat 162 to the movable iron core 172.
  • FIG. 14 is a pictorial view illustrating a position at which the elastic clip 168 presses the shoe 166.
  • the positions at which the elastic clips 168 press the shoe 166 are provided near a virtual line 166a, which is defined as a virtual plane 165 including a rotating axis center 105a of the drum 105 and a center 162a of the spherical band of the spherical band seat 162 intersects with the surface of the shoe 166 facing the drum 105, and at both end sides of the shoe 166.
  • the elastic clips 168 are tapered toward the leading ends thereof so as to press the specific positions of the shoe 166, as shown in FIG. 11 .
  • the elastic clip 168 is tapered toward the leading end thereof.
  • a portion of the leading end of the elastic clip 168, which portion presses the shoe 166 may be provided with a convex protrusion (not shown) and the protrusion may press the shoe 166.
  • FIGS. 5 and 6 A method with which a maintenance-man diss and inspects the braking device 1 for repair will be described with reference to FIGS. 5 and 6 .
  • a maintenance-man when maintaining the braking device, a maintenance-man disengages the bolts 114 that fix the hooks 117 and the bolts 113 that fasten the arms 111 to the attachment parts 103b. Then, the maintenance-man slightly loosens the screw-threaded bolts 112 so that the arms 111 can be pivoted. Then, as shown in FIG. 6 , when the arms 111 are pivoted about the bolts 112 serving as support points, the drive sections 170 and the braking sections 150 get away from the drum 105. Thereby, the maintenance-man can check the parts hidden by the drum 105 with eyes.
  • the maintenance-man After the inspection and the like, the maintenance-man assembles the braking device in reverse order to reassemble the braking device 1.
  • the gap g between the frictional member 169 and the outer peripheral surface of the drum 105 is adjusted to have a prescribed value. The method of adjusting the gap g will be described with reference to FIGS. 5 and 6 .
  • a maintenance-man When maintaining the braking device, a maintenance-man measures the gap g before the adjustment, disengages the bolts 114 that fix the hooks 117 and the bolts 113 that fasten the arms 111 to the attachment parts 103b, and slightly loosens the bolts 112 so that the arms 111 can be pivoted. Then, as shown in FIG. 6 , the maintenance-man pivots the arms 111 about the bolts 112 serving as support points.
  • the spacers 115 having a predetermined thickness t prepared in advance are sandwiched between the arms 111 and the attachment parts 103b. Then, the arms 111 are again fastened to the attachment parts 103b by the bolts 113 and fixed to the attachment parts 103a by the bolts 112 and the hooks 117 are fixed to the attachment parts 103b by the bolts 114. Like this, it is possible to change the gap g depending on the thickness t of the spacer 115.
  • the spacer 115 may be singular or plural.
  • FIG. 7 illustrates a state in which the drum 105 can be released from the frictional member 169 and can be thus pivoted.
  • the electromagnetic coils 176 are excited to suck the movable iron core 172 toward the arm 111 against the extending force of the springs 174, and the outer peripheries of the rubber rings 173 elastically deformed and the inner peripheral surfaces of the guide holes 172a are contacted to hold the movable iron core 172.
  • the gap g is formed between the frictional member 169 and the drum 105, so that the drum 105 can be rotated.
  • the springs 174 extend to urge and move the movable iron core 172 toward the drum 176.
  • the movable iron core 172 is moved while the inner peripheral surfaces of the guide holes 172a slide along the outer peripheries of the rubber rings 173. Then, as shown in FIG. 8 , the movable iron core 172 is moved to the braking position at which it presses the frictional member 169 of the braking section 150 to the outer peripheral surface of the drum 105.
  • the rubber rings 173 supports the movable iron core 172 while the rubber rings are elastically deformed and contacted to the inner peripheral surfaces of the guide holes 172a, and guide the movable iron core 172 while the rubber rings slide along the inner peripheral surfaces of the guide holes 172a.
  • the engaged position of the spherical band seat 162 and the spherical crown seat 164 is deviated by the force with which the drive section 170 urges the frictional member 169 toward the drum 105, and the elastic clips 168 are torsionally elastically-deformed to change the postures of the frictional member 169 and the shoe 166 with respect to the drum 105.
  • the frictional member 169 and the shoe 166 change the postures thereof in an arrow M direction of FIG. 14 .
  • the braking surface of the frictional member 169 is uniformly pressed along the outer peripheral surface of the drum 105.
  • the restoring force for removing the torsion is small and is smaller than the frictional force applied to the engaged part. Accordingly, even when the frictional member 169 is separated from the drum 105, the frictional member 169 and the shoe 166 keep the same postures as those in the pressed state. Thus, the gap g between the frictional member 169 and the drum 105 becomes substantially uniform.
  • the braking device 101 configured as described above realizes the following effects.
  • a maintenance-man when maintaining the braking device, a maintenance-man disengages the bolts 114 that fix the hooks 117 and the bolts 113 that fasten the arms 111 to the attachment parts 103b. Then, the maintenance-man slightly loosens the engaged bolts 112 fixed to the attachment parts 103a so that the arms 111 can be pivoted. Then, as shown in FIG. 6 , when the arms 111 are pivoted about the bolts 112 serving as support points, the drive sections 170 and the braking sections 150 get away from the drum 105. Thereby, the parts hidden by the drum 105 are exposed, so that the maintenance-man can check the same with eyes.
  • the braking section 150 is directly mounted to the drive section 170. Accordingly, an interlocking member or interlocking mechanism for interlocking the drive section 170 and the braking section 150 is not necessary. Thus, since it is possible to miniaturize the apparatus including the drive section 170 and the braking section 150, the braking device 101 is also miniaturized.
  • the arms 111 of the braking device 101 are fixed at the one end portions thereof to the attachment parts 103a by the bolts 112 and at the other end portions thereof to the attachment parts 103b by the bolts 113, the arms 111 are hard to move at the braking time, so that it is possible to secure the stable braking force.
  • a hole may be formed instead of the screw hole 103c of the attachment part 103a and a pin may be used instead of the bolt 112 (not shown).
  • the hook 117 holds the arm 111 to the attachment part 103b via the head of the bolt 113 so that the arm 111 is not pivoted. Accordingly, even when the fastening force of the bolt 113 disappears, the braking force of the braking device 101 does not disappear.
  • the hook 117 that is the pivot-preventing unit is shaped to hold the other end portion of the arm 111 via the bolt 113.
  • the hook 117 is shaped to directly contact and hold the other end portion of the arm 11 and to prevent the pivoting of the arm while avoiding the bolt 113, it is possible to realize the same effects.
  • the spacer 115 having a thickness t is sandwiched with the arm 111 being pivoted and the arm 111 is again fastened to the holder 103 by the bolt 113.
  • the movable iron core 172 is elastically supported by the rubber rings 173. Also, when sucking the movable iron core 172 toward the arm 111 or urging the movable iron core 172 toward the drum 105 by the springs 174, the rubber rings 173 fitted in the recesses 171a of the leading ends of the guide pins 171 are guided and moved while sliding along the inner peripheral surfaces of the guide holes 172a of the movable iron core 172.
  • the braking device 101 is provided with the correction section 161.
  • the correction section 161 When pressing the frictional members 169 of the braking sections 150, it is possible to press the braking surfaces of the frictional members 169 to the outer peripheral surface of the drum 105 substantially and uniformly. Thus, the braking force of the braking device 101 becomes stable.
  • the braking surfaces of the frictional members 169 are separated from the outer peripheral surface of the drum 105 while maintaining the same postures as those in the pressed state. Accordingly, it is possible to make the gaps g between the frictional members 169 and the outer peripheral surface of the drum 105 substantially uniform, so that it is possible to easily adjust the gaps g to the prescribed range.
  • the arm 111 and the attachment part 103b are fastened by the bolt 113 with one spacer 115 being sandwiched therebetween.
  • an arm 411 and an attachment part 403b may be fastened by the bolts 113 with two spacers having different thickness, i.e., spacers 415, 416 being sandwiched side by side in the rotating axis center direction of the drum 105.
  • One end portion of the arm 411 is fastened to an attachment part 403a of a holder 403 by the bolt 112, and the other end thereof is fastened to the attachment part 403b by the bolts 113. Then, the movable iron core 172 provided to the arm 411 presses and separates the frictional member 169 to and from the drum 105. At this time, the arm 411 may be fastened, with being deviated in the rotating direction about a vertical axis due to the manufacturing errors of the arm 411 or holder 403. In this state, the arm 411 is inclined with respect to the outer peripheral surface of the drum 105 and the movable iron core 172 obliquely presses and separates the frictional member 169 to and from the drum 105.
  • the rectangular parallelepiped spacer 115 is sandwiched between the arm 111 and the attachment part 103b.
  • a wedge-shaped spacer 615 may be sandwiched.
  • the wedge-shaped spacer 615 is sandwiched between an arm 611 and the attachment part 103b and the arm 611 is fastened to the attachment part 103b by the bolt 113.
  • the contact surfaces of the arm 611 and the spacer 615 are inclined at the same angle.
  • a bolt 610 provided to a stop plate 619 contacting the attachment part 103b and the arm 611 fixes the spacer 615 with pulling so that the spacer 615 does not protrude from between the arm 611 and the attachment part 103b.
  • the method of adjusting the gap g will be described in case that the wedge-shaped spacer 615 is sandwiched,.
  • the bolt 112 is slightly loosened so that the arm 611 can be pivoted about the bolt 112 serving as a support point.
  • the spacer 615 is inserted to expand the distance between the attachment part 103b and the arm 611, so that the gap g is enlarged.
  • the gap g is adjusted by changing the thickness t of the spacer 115 sandwiched between the arm 111 and the attachment part 103b.
  • a thin plate-shaped shim may be sandwiched between the movable iron core 172 and the spherical band seat 162 and the gap g may be adjusted by changing a thickness of the shim, which is not shown.
  • the adjustment method is as follows.
  • the arm 111 is pivoted, a shim having a predetermined thickness prepared in advance is sandwiched between the movable iron core 172 and the spherical band seat 162 so as to adjust the gap g to a desired value, and the arm 111 is again fastened to the attachment part 103b.
  • a shim having a predetermined thickness prepared in advance is sandwiched between the movable iron core 172 and the spherical band seat 162 so as to adjust the gap g to a desired value
  • the arm 111 is again fastened to the attachment part 103b.
  • the adjustment method using the shim sandwiched between the movable iron core 172 and the spherical band seat 162 it is possible to perform the adjustment at the closer position to the part to be adjusted, compared to the adjustment method using the spacer 115 sandwiched between the arm 111 and the attachment part 103b.
  • the number of parts to be sandwiched between the position to be adjusted and the gap to be adjusted is smaller. Accordingly, the influence resulting from the rattling between the respective parts is reduced, so that the adjustment precision is improved and thus the adjustment operation is easily performed.
  • the guide pins 171 having the rubber rings 173 fitted thereto are inserted into the guide holes 172a provided to the movable iron core 172.
  • the four guide pins 171 are provided to stand from an arm 511, circular recesses 572a are formed at four corners of the movable iron core 572 facing the guide pins 171 and parts of the rubber rings 173 fitted in the recesses 171a of the guide pins 171 are engaged into the recesses 572a.
  • the outer peripheries of the rubber rings 173 facing the recesses 572a are slightly elastically-deformed and contacted to the recesses 572a.
  • the movable iron core 572 is elastically supported to the arm 511 via the rubber rings 173 and the guide pins 171 and is slidingly guided along the rubber rings 173.
  • the movable iron core 572 When the movable iron core 572 is moved, it is moved while the recesses 572a are slidingly guided along the rubber rings 173. Hence, the movable iron core 572 can be smoothly moved.
  • the rubber rings 173 are always exposed, so that the maintenance-man can easily inspect the states of the rubber rings 173 or states of the sliding parts with eyes.
  • the shoe 166, the spherical crown seat 164 and the spherical band seat 162 are pressed to the movable iron core 172 by the spring force of the elastic clips 168.
  • a spherical band seat having magnetic force (not shown), instead of the elastic clips.
  • the movable iron core, the spherical band seat, the spherical crown seat and the shoe are sucked and coupled by the magnetic force.
  • the frictional member When separating the frictional member, the frictional member is separated from the outer peripheral surface of the drum while maintaining the same posture as that in the pressed state. Accordingly, the gap between the braking surface of the frictional member and the outer peripheral surface of the drum becomes substantially uniform and it is possible to easily adjust the gap g to the prescribed range. In addition, it is not necessary to mount and dismount the screws for fixing the elastic clips, so that it is possible to simply disassemble and assemble the braking device.
  • a third illustrative embodiment of the present invention will be described with reference to FIG. 16 .
  • the spacer 115 when adjusting the gap g between the frictional member 169 and the drum 105, the spacer 115 is sandwiched between the arm 111 and the attachment part 103b.
  • the distance between the arm 111 and the attachment part 103b is adjusted by a bolt and nuts.
  • the elements indicated with the same reference numerals as the other illustrative embodiments indicate the same parts in this illustrative embodiment, and the descriptions thereof will be omitted.
  • the movable iron core 172 is sucked to the arm 111 and the gap g is formed between the frictional member 169 and the drum 105.
  • the one end portion of the arm 111 is fastened to the attachment part 103a by the bolt 112.
  • a bolt 313 is inserted into a hole 111b formed in the other end portion of the arm 111 and a leading end of the bolt 313 is screwed into a screw hole 103d formed in the attachment part 103b.
  • Two nuts 320 are screw-threaded on the bolt 313.
  • the bolt 313 is fixed to the attachment part 103b by one nut 320 and the arm 111 is fixed to the bolt 313 by the other nut 320.
  • the method of adjusting the gap g will be described.
  • the two nuts 320 screw-threaded on the bolt 313 are loosened and the bolt 112 is slightly loosened so that the arm 111 can be pivoted about the bolt 112 serving as a support point.
  • the gap g is adjusted to a prescribed value.
  • the two nuts 320 are tightened and the bolt 112 is also tightened.
  • one bolt 313 is used.
  • two bolts 313 may be provided side by side in the rotating axis center direction of the drum 105, which is not shown. Due to the manufacturing errors, the facing surfaces of the arm 111 and the attachment part 103b may not be parallel with each other. In this case, it is possible to adjust the inclination of the arm 111 by adjusting the tightened degree of the respective bolts 313. Thereby, the operation of the movable iron core 172 to press and separate the frictional member 169 to and from the drum 105 becomes stable.
  • the arms 111, the attachment parts 103a and the attachment parts 103b are provided at both end sides of the outer periphery of the drum 105.
  • the arms 111, the attachment parts 103a and the attachment parts 103b are provided at obliquely upper sides of the outer periphery of the drum 105.
  • the elements indicated with the same reference numerals as the other illustrative embodiments indicate the same parts in this illustrative embodiment and the descriptions thereof are omitted.
  • a hoist 282 may be provided to a wall side of a machine chamber 281.
  • attachment parts 203a and attachment parts 203b of a holder 203 are provided so that the arms 111 are positioned at obliquely upper sides of the outer periphery of the drum 105.
  • the spacers 115 (not shown) sandwiched between the arms 111 and the attachment parts 203b and the bolts 113 (not shown) are disengaged and the bolts 112 of the attachment parts 203a are slightly loosened so that the arms 111 are pivoted about the bolts 112 serving as support points.
  • the same effects as the second illustrative embodiment are realized.
  • the hoist 282 is provided to the wall side of the machine chamber 281, it is possible to easily repair the drive section 170 and the braking section 150 by pivoting the arms 111. Further, a degree of freedom of the layout for mounting the hoist 282 to the machine chamber 281 is also improved.
  • the arms 111, the attachment parts 103a and the attachment parts 103b are provided at both sides of the outer periphery of the drum 105.
  • the arms 111, the attachment parts 103a and the attachment parts 103b are provided at obliquely upper sides of the outer periphery of the drum 105.
  • the arms and the attachment parts may be circumferentially provided at arbitrary positions of the outer periphery of the drum depending on the layout for mounting the hoist.
  • the attachment parts of the arms are provided to the holder that rotatably holds the drum.
  • the attachment parts of the arms may be provided to a fixed member instead of the holder.
  • two sets of the arms, the drive sections and the braking sections are respectively provided to one hoist.
  • one set or three or more sets may be provided to one hoist depending on the required braking capacity.
  • the drum In the second and fourth illustrative embodiments, the case is shown in which the drum is not accommodated in the holder. However, the drum may be accommodated in the housing, like the first illustrative embodiment.
  • the present invention can be applied to a braking device for an elevator hoist.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Braking Arrangements (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
EP10796857.0A 2009-07-07 2010-05-28 Braking device for elevator hoist Active EP2452911B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/JP2009/003140 WO2011004424A1 (ja) 2009-07-07 2009-07-07 エレベータ巻上機の制動装置
PCT/JP2010/003581 WO2011004543A1 (ja) 2009-07-07 2010-05-28 エレベータ巻上機の制動装置

Publications (3)

Publication Number Publication Date
EP2452911A1 EP2452911A1 (en) 2012-05-16
EP2452911A4 EP2452911A4 (en) 2015-10-28
EP2452911B1 true EP2452911B1 (en) 2018-02-21

Family

ID=43428866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10796857.0A Active EP2452911B1 (en) 2009-07-07 2010-05-28 Braking device for elevator hoist

Country Status (5)

Country Link
EP (1) EP2452911B1 (ja)
KR (1) KR101392054B1 (ja)
CN (1) CN102471030B (ja)
BR (1) BR112012000418A2 (ja)
WO (2) WO2011004424A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102753469B (zh) * 2010-02-10 2015-04-01 三菱电机株式会社 电梯用曳引机的制动装置
FI20115145L (fi) * 2011-02-15 2012-08-16 Kone Corp Kiinnitysrajapinta koneistojarrulle sekä koneistojarru
JP6108826B2 (ja) * 2012-12-28 2017-04-05 株式会社日立製作所 エレベータの巻上機用電磁ブレーキ装置
JP5911042B2 (ja) * 2013-04-24 2016-04-27 三菱電機株式会社 ブレーキ装置、及びそれを用いたエレベータ用巻上機
JP2015089840A (ja) * 2013-11-05 2015-05-11 株式会社日立製作所 電磁ブレーキ装置、巻上機及びエレベータ装置
CA3030960A1 (en) * 2016-08-01 2018-02-08 Lewis Designs, LLC Brake sphere for spherical braking apparatus
CN107060554B (zh) * 2017-06-09 2019-01-01 苏州安泰空气技术有限公司 一种生物安全柜电动前窗失电保护装置

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JPS6071737U (ja) * 1983-10-21 1985-05-21 小倉クラツチ株式会社 電磁ドラムブレ−キ
JPH05338967A (ja) * 1992-06-02 1993-12-21 Mitsubishi Electric Corp エレベーター用巻上機の制動装置
US5899304A (en) * 1997-05-21 1999-05-04 Daugherty; Jack L. Motor brake
JPH11222371A (ja) * 1998-02-06 1999-08-17 Mitsubishi Electric Building Techno Service Co Ltd エレベータのブレーキ装置
JP4482196B2 (ja) * 2000-05-15 2010-06-16 三菱電機株式会社 エレベーター用巻上機
JP2002284486A (ja) 2001-03-22 2002-10-03 Sanyo Kogyo Kk 巻上装置
JP2002362861A (ja) * 2001-06-04 2002-12-18 Mitsubishi Electric Corp エレベーター巻上機の制動装置
EP1431232B1 (en) * 2001-06-29 2012-11-07 Mitsubishi Denki Kabushiki Kaisha Elevator hoist and elevator device
JP4184774B2 (ja) * 2002-12-11 2008-11-19 株式会社日立製作所 エレベーター用巻上機
JP4391119B2 (ja) * 2003-04-18 2009-12-24 東芝エレベータ株式会社 エレベータのブレーキ装置
JP4009286B2 (ja) * 2004-12-06 2007-11-14 三陽工業株式会社 巻上機用の制動装置
JP2009046235A (ja) * 2007-08-17 2009-03-05 Mitsubishi Electric Corp ブレーキ装置

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Also Published As

Publication number Publication date
CN102471030B (zh) 2014-03-12
EP2452911A4 (en) 2015-10-28
CN102471030A (zh) 2012-05-23
EP2452911A1 (en) 2012-05-16
WO2011004543A1 (ja) 2011-01-13
KR20120024949A (ko) 2012-03-14
KR101392054B1 (ko) 2014-05-07
BR112012000418A2 (pt) 2019-09-24
WO2011004424A1 (ja) 2011-01-13

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