CN203486698U - Elevator steel wire rope holder - Google Patents

Elevator steel wire rope holder Download PDF

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Publication number
CN203486698U
CN203486698U CN201320526573.9U CN201320526573U CN203486698U CN 203486698 U CN203486698 U CN 203486698U CN 201320526573 U CN201320526573 U CN 201320526573U CN 203486698 U CN203486698 U CN 203486698U
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CN
China
Prior art keywords
spring
clutch
elevator
wire rope
wire holder
Prior art date
Application number
CN201320526573.9U
Other languages
Chinese (zh)
Inventor
张维克
曹仪
Original Assignee
常熟市琴茂机械有限公司
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Publication date
Priority to CN201310367935 priority Critical
Priority to CN201310367935.9 priority
Application filed by 常熟市琴茂机械有限公司 filed Critical 常熟市琴茂机械有限公司
Priority to CN201320526573.9U priority patent/CN203486698U/en
Application granted granted Critical
Publication of CN203486698U publication Critical patent/CN203486698U/en

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Abstract

The utility model discloses an elevator steel wire rope holder and belongs to elevator safety protective devices. The elevator steel wire rope holder comprises a braking device, a cam device, a spring device, a spring compression device and a locking device, wherein the braking device comprises a fixed braking vane and a movable braking vane, and the spring compression device comprises a chain wheel-belt transmission device formed by a chain wheel chain transmission device and a hoisting mechanism. When the steel wire rope holder brakes, a spring in the spring device is released to push a cam follower in the cam device to drive the movable braking vane to move towards the fixed braking vane, and finally the braking device holds a steel wire rope. When the steel wire rope holder needs to release the steel wire rope, the chain wheel-belt transmission device pulls the cam follower under the action of force to compress the spring, then the movable braking vane is separated from the fixed braking vane, and the steel wire rope is released. The elevator steel wire rope holder has the advantages that the chain wheel-belt transmission device is strong in impact resistance, and the whole steel wire rope holder is good in braking effect, simple and compact in structure, convenient to operate and maintain, safe and free of pollution.

Description

Elevator wire rope wire holder
Technical field
The utility model belongs to the safety guard technical field of elevator, be specifically related to a kind of when lift car abnormal running state the wire holder of urgent stop elevator steel rope.
Background technology
Modem elevator is mainly comprised of towing machine, guide rail, counterweight, safety device (as velocity limiter, safety tongs and energy disperser etc.), signal manipulation system, car and Room door etc.These parts are arranged on respectively in the hoistway and machine room of building.Conventionally adopt Wire Friction Driving, steel rope is walked around traction sheave, and two ends connect respectively car and counterbalanced weight, and direct motor drive traction sheave makes car lifting.That elevator requires is safe and reliable, transport efficiency is high, leveling accuracy and ride comfort etc.And in actual life; often there are all kinds of elevator accidents; door system accident, the car end accident of rushing to summit or squat for example; to passenger, bring potential safety hazard; so require elevator that safety protection device for lift car must be installed in elevator standard, urgent stop elevator car when car leaves floor ground when lift car exceeds the speed limit or when car door opens.
Existing safety protection device for lift car mainly contains rapid stop traction sheave or stop steel rope or rapid stop counterweight or direct stop car rapidly.Wherein the disclosed technical scheme of the wire holder of stop steel rope is more, for example Hollister-Whitney Elevator Corp. is in the current failed Chinese utility model patent of application on July 23rd, 1993, name is called " the elevator car brake equipment of belt brake piece ", this car brake equipment comprises a pair of braking brake piece, when establishing the spring relaxation of moving locked component in compressive state by cable, brake shoes combination and clamp steel rope, spring is compressed by fluid-operated piston cylinder assembly set, the cam follower that is connected to one of brake shoes moves along cam face, cam follower makes a brake shoes move towards another brake shoes.Locked component is opened responsive from the movement of flooring and door thereof to car speed, car, can actuatable switches control car control panel, to do not prevent that car from moving when spring compresses with brake shoes inordinate wear with cam follower.This wire holder that utilizes hydraulic efficiency pressure system to carry out Compress Spring, install more loaded down with trivial detailsly, hydraulic efficiency pressure system comprises piston, hydraulic actuating cylinder, valve, flexible pipe, joint etc., and these parts easily lost efficacy in use procedure repeatedly, form and leak, leakage of oil meeting can bring adverse effect to environment.
In view of above-mentioned prior art, be necessary existing wire holder structure to be improved, technical scheme described below produces under this background.
Utility model content
The technical matters that the utility model mainly solves is to provide a kind of elevator wire rope wire holder, and this elevator wire rope wire holder has the feature of good braking effect, compact conformation, operating maintenance convenience, long service life, safety non-pollution.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of elevator wire rope wire holder is provided, comprises:
Brake gear, comprises determining braking vane and the moving braking vane of the second brake rubber block being installed of the first brake rubber block is installed;
Cam gear, described cam gear is connected on moving braking vane, and it comprises the first cam, the second cam and cam follower;
Spring installation, described spring installation is connected on the cam follower of described cam gear;
Spring-compressed mechanism, described spring-compressed mechanism is connected on the cam follower of described cam gear;
Latching device, described latching device is connected on the cam follower of described cam gear;
Described spring-compressed mechanism comprises the sprocket wheel-belt driver consisting of sprocket chain strip transmission mechanism and hoisting mechanism, when wire holder brake wire, spring in spring installation discharges from compressive state, thereby spring actuating cam follower drives moving braking vane towards determining braking vane motion, finally makes the first brake rubber block and the second brake rubber block clamp steel rope; When wire holder discharges steel rope, thereby the spring of sprocket wheel-belt driver in the drop-down moving cam follower of the effect compression spring device of power makes braking vane away from determining braking vane, thereby discharges steel rope.
In preferred embodiment of the utility model, described sprocket wheel-belt driver comprise minor sprocket, with the hinge wheel of minor sprocket same plane setting, be engaged on chain on minor sprocket and Dalian wheel, by key fixed cover the 4th adapter shaft of hinge wheel is housed, for pulling the elevator band of cam follower, described elevator band one end is wound in the middle part of the 4th adapter shaft, and the other end is connected on the connecting element of spring installation after walking around the axle of cam follower.
In preferred embodiment of the utility model, the middle part of described the 4th adapter shaft has wedged hole, and the head of elevator band is wound in the outer round surface of the 4th adapter shaft after walking around a voussoir and being flush-mounted in wedged hole together with voussoir.
In preferred embodiment of the utility model, the middle part of the axle of described cam follower is set with antifriction-bearing box, and described elevator band is around hanging on this antifriction-bearing box.
In preferred embodiment of the utility model, described sprocket wheel-belt driver also comprises the track adjusting wheel arranging with minor sprocket and Dalian wheel same plane.
In preferred embodiment of the utility model, described spring-compressed mechanism also comprises motor and gear case.
In preferred embodiment of the utility model, described spring-compressed mechanism also comprises overriding clutch, described overriding clutch is for coordinates transmission of torque so that motor and gear case are exported to sprocket wheel-belt driver with sprocket wheel-belt driver at wire holder dispose procedure, thus the spring in compression spring device; In wire holder braking procedure, be that in the process of the spring releasing compression in spring installation, overriding clutch disengaging coordinates with sprocket wheel-belt driver.
In preferred embodiment of the utility model, described gear case comprises output shaft, described overriding clutch comprises the first half-clutch device and the second half-clutch device, on the output shaft of gear case, be set with successively minor sprocket, the first half-clutch device and the second half-clutch device, minor sprocket and the first half-clutch device one processes or both are combined into one by connecting element, both are not with output shaft rotation, and the second half-clutch device is along with output shaft rotation, when the first half-clutch device and the second half-clutch device match, the second half-clutch device can be given the first half-clutch device by the transmission of torque of output shaft, and then minor sprocket is rotated.
In preferred embodiment of the utility model, between described the second half-clutch device and the output shaft of gear case, steel ball is installed.
In preferred embodiment of the utility model, described overriding clutch also comprises coil pack, moving iron core member, locating pin bracket and fork, moving iron core member is arranged in the inside of coil pack, the part that moving iron core member stretches out coil pack is connected in the middle part of fork, described fork one end is fixedly installed in locating pin bracket by locating dowel pin, the described fork other end is connected with the second half-clutch device, thereby fork can be under the electromagnetic force producing between coil pack and moving iron core member rotates and realizes coordinating of the second half-clutch device and the first half-clutch device around locating dowel pin.
The beneficial effects of the utility model are: the utility model adopts after said structure, there is one of advantage, adopt sprocket wheel chain gear and belt-driving, two kinds of drivings device are with respect to gear system or power hydraulic system, and simple in structure, strong shock resistance, good braking effect, environment friendly and pollution-free, operating maintenance convenient;
Advantage two, at wire holder during in release position, by compression, belt is wound on the 3rd adapter shaft spring, but sprocket wheel-belt driver do not stress, and only has catch gear to the cam follower application of force, so can extend the service life of driving device;
Advantage three, the second half-clutch device of described overriding clutch is to the first half-clutch device, moved and engage under the effect of electromagnetic force by steel ball, thereby by the transmission of torque of gearbox output shaft to sprocket wheel-belt driver, in this process, what the second half-clutch device was subject in moving process is force of rolling friction, less than the force of sliding friction that in general power-transfer clutch, half-clutch device is subject to, so the frayed mild degree of overriding clutch, service life is relatively long;
Advantage four, the track adjusting wheel in described sprocket wheel-belt driver presses to the portion of chain of a side portion of chain of opposite side, dwindling chain gear part takes up space, make spring installation and cam follower install and arrange near chain part, make arrangement of parts compacter.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also according to these accompanying drawings, obtain other accompanying drawing, wherein:
Fig. 1 is the block diagram in the utility model wire holder one direction;
Fig. 2 is the block diagram on the utility model wire holder other direction;
Fig. 3 is the structural representation of the utility model wire holder in releasing position;
Fig. 4 is the left view of Fig. 3;
Fig. 5 is the birds-eye view of Fig. 3;
Fig. 6 A-A cutaway view during in releasing position that is Fig. 3 at wire holder;
Fig. 7 B-B cutaway view during in releasing position that is Fig. 3 at wire holder;
Fig. 8 C-C cutaway view during in releasing position that is Fig. 3 at wire holder;
Fig. 9 D-D cutaway view during in releasing position that is Fig. 4 at wire holder;
Figure 10 is the utility model wire holder at the first brake rubber block and the wearing and tearing of the second brake rubber block are very little or without the structural representation during in braking position under wear pattern;
Figure 11 is the E-E cutaway view of Figure 10;
The structural representation that Figure 12 is the utility model wire holder when the first brake rubber block and the second brake rubber block may wear in limit situation in braking position;
Figure 13 is the F-F cutaway view of Figure 12;
Figure 14 is the circuit diagram for the utility model wire holder;
In accompanying drawing, the mark of each parts is as follows: 1, steel rope, 2a, normal open switch, 2b, normally closed switch, 3, trigger arm, 4, brake rubber block wearing and tearing switch, 5, trigger arm, 6, automatic/hand change-over switch, 7, test switch, 8, master cock, 9, lead-in wire, 10, lead-in wire, 11, lead-in wire, 12, lead-in wire, 100, brake gear, 101, determine braking vane, 102, moving braking vane, 103, the first brake rubber block, 104, the second brake rubber block, 200, cam gear, 201, cam follower, 202, the first adapter shaft, 203, the first connecting panel, 204, the second connecting panel, 205, the first cam, 206, the second cam, 207, the first slit, 208, the second slit, 209, first end, 210, the second end, 211, the second adapter shaft, 212, bearing, 213, the first sliding shoe, 214, the second sliding shoe, 215, L shaped triggering block, 216, screw, 300, spring installation, 301, the first spring, 302, the second spring, 303, the first sleeve pipe, 304, the second sleeve pipe, 305, the first pilot bar, 306, the second pilot bar, 307, the 3rd pilot bar, 308, the 4th pilot bar, 309, the first cap, 310, the second cap, 311, the 3rd adapter shaft, 410, motor, 420, gear case, 421, gear case adapter plate, 422, output shaft, 430, overriding clutch, 431, the first half-clutch device, 432, the second half-clutch device, 433, fork, 434, coil pack, 435, moving iron core member, 436, pin, 437, base, 438, locating dowel pin, 439, locating pin bracket, 440, sprocket wheel-belt driver, 441, minor sprocket, 442, Dalian wheel, 443, track adjusting wheel, 444, chain, 445, the 4th adapter shaft, 446, bearing seat, 447, elevator band, 500, catch gear, 501, coil pack, 502, moving iron core member, 503, base, 504, mounting base, 505, jacking block, 506, roller, 507, bearing pin, 508, connecting strap, 509, claw, 510, fixed block, 511, carrier bar, 600, installing mechanism, 601, the first side plate, 602, the second side plate, 603, the first mounting bracket, 604, the second mounting bracket, 605, the first sliding tray, 606, the second sliding tray.
The specific embodiment
Below the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present utility model, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making all other embodiment that obtain under creative work prerequisite, all belong to the scope of the utility model protection.
An elevator wire rope wire holder, refers to Fig. 1, and a kind of elevator wire rope wire holder is arranged on elevator erecting frame, and this mounting means is unrestricted and belong to known prior art, here repeats no more.Described elevator wire rope wire holder comprises brake gear 100, cam gear 200, spring installation 300, spring-compressed mechanism 400, latching device 500 and installing mechanism 600.
Described brake gear 100 comprises determining braking vane 101 and the moving braking vane 102 of the second brake rubber block 104 being installed of the first brake rubber block 103 is installed, moving braking vane 102 can be with respect to determining braking vane 101 motions, so that the first brake rubber block 103 and the second brake rubber block 104 clampings and release steel rope.
Described cam gear 200 is connected on moving braking vane 102, it comprises the first cam 205, the second cam 206 and cam follower 201, and the axle by cam follower 201 drives moving braking vane 102 in the first cam 205 surfaces and the lip-deep motion of the second cam 206 and 101 moves with respect to determining braking vane.
Described spring installation 300 is connected on the cam follower 201 of described cam gear 200, thereby comes translating cam follower 201 to drive moving braking vane 102 with respect to 101 motions of determining braking vane by the spring in spring installation 300 flexible.
Described spring-compressed mechanism 400 is connected on the cam follower 201 of described cam gear 200, for the spring of compression spring device 300.
Described latching device 500 is connected on the cam follower 201 of described cam gear 200, for the snap lock of spring installation 300 at compressed state.
As shown in Figure 1, Figure 2, Figure 3 shows, described wire holder comprises wire holder is installed to the installing mechanism 600 on elevator erecting frame, the first side plate 601 and the second side plate 602 that it comprises parallel opposed, be fixed on elevator erecting frame by the first mounting bracket 603 and the second mounting bracket 604 respectively on biside plate 601,602 lateral surfaces.Between the first side plate 601 and the second side plate 602, be provided with spring installation 300, spring installation 300 comprises the first spring 301 and the second spring 302, Rectangular Spring for example, they are applied to pressure on cam gear 200, cam gear 200 comprises cam follower 201, first adapter shaft 202, the first adapter shaft 202 two ends that are provided with of cam follower 201 inner pivot are carried by the first connecting panel 203 and the second connecting panel 204.The two ends of the first adapter shaft 202 can be moved along the convex arc surface of the first cam 205 and the second cam 206, and these two cams 205,206 are respectively installed on the first side plate 601 and the second side plate 602 or are respectively parts for the first side plate 601 and the second side plate 602.
As shown in Fig. 6, Fig. 8, Figure 11, Figure 13, the first side plate 601 and the first cam 205 form the first slit 207, the second side plates 602 and second cam 206 formation the second slit 208, two slits 207,208 have respectively first end 209 and the second end 210.The size of the first slit 207 and the second slit 208 is a bit larger tham the external diameter of the first adapter shaft 202, with allow the first adapter shaft 202 in the first slit 207 and the second slit 208 towards with away from 210 motions of first end 209 and the second end.
Pivotable second adapter shaft 211 that is connected with of the other end of the first connecting panel 203 and the second connecting panel 204 as shown in Figure 1 and Figure 2, between the first side plate 601 medial surface relative with the second side plate 602, be provided with the first sliding shoe 213 and the second sliding shoe 214 being arranged on the second adapter shaft 211, on the first side plate 601 and the second side plate 602, being formed with respectively the first sliding tray 605 and the second sliding tray 606, the first sliding shoes 213 and the second sliding shoe 214 can be respectively in the first sliding tray 605 and the interior slip of the second sliding tray 606.
As shown in Fig. 1,2,4,6,7,8,11,13, described brake gear 100 comprises determines braking vane 101 and moving braking vane 102, determining braking vane 101 is fixedly installed between the first side plate 601 and the second side plate 602 opposite faces, moving braking vane 102 is set in parallel on the first sliding shoe 213 and the second sliding shoe 214 with respect to determining braking vane 101, determines to be separately installed with the first brake rubber block 103 and the second brake rubber block 104 on face that braking vane 101 is relative with moving braking vane 102.Because the first sliding shoe 213 and the second sliding shoe 214 can be respectively in the first sliding tray 605 and the interior slips of the second sliding tray 606, so moving braking vane 102 can pushed away from and towards determining braking vane 101.
Between the first described brake rubber block 103 and the second brake rubber block 104, pass through elevator wire rope 1.When moving braking vane 102 is when determining braking vane 101 and move, the first brake rubber block 103 and the second brake rubber block 104 will coordinate steel rope 1, when the first brake rubber block 103 and the second brake rubber block 104 are applied on steel rope 1 by enough Clamping forces, the first brake rubber block 103 and the second brake rubber block 104 will clamp steel rope 1 makes it stop motion.Wire holder of the present utility model forms such Clamping force by the first spring 301 and the second spring 302, and along with moving on cam follower 201, the Clamping force that the first spring 301 and the second spring 302 apply will reduce.When wire holder brake wire, the Clamping force of 103,104 pairs of steel ropes 1 of first, second brake rubber block is 10 times that the spring of first, second spring 301,302 is made a concerted effort.Although two springs shown in figure, also can adopt a spring or two to come cam follower 201 application of forces with upper spring.
The in the situation that of the normal operation of lift car, the first spring 301 and the second spring 302 keep by compression.But, under abnormal condition, for example, when car speeding, car door are opened, car leaves floor ground, now elevator control loop can cut off rapidly the power supply of latching device 500, latching device 500 is thrown off, and the first spring 301 and the second spring 302 are released actuating cam follower 201 and move up.The first adapter shaft 202 of cam follower 201 inside is along with the convex arc surface of the first cam 205 and the second cam 206 is upwards moved, in mobile process, the first adapter shaft 202 is increasing with the distance of determining braking vane 101, the first adapter shaft 202 drives moving braking vane 102 to move towards determining braking vane 101 by the first connecting panel 203 and the second connecting panel 204, thereby makes the first brake rubber block 103 and the second brake rubber block 104 clamp steel rope 1.During wire holder end of braking, determine 102 pairs of steel ropes of braking vane 101 and moving braking vane and apply final gripping power.When the first brake rubber block 103 and the second brake rubber block 104 wearing and tearing, the first spring 301 and the second spring 302 extend, thereby strong constant gripping power is provided.
The convex arc surface of the first slit 207, the second slit 208, the first cam 205 and the second cam 206 has enough length to make when wire holder is during in releasing position, determining has enough intervals between braking vane 101 and moving braking vane 102, make the first brake rubber block 103 not contact steel rope 1 with the second brake rubber block 104, even if steel rope 1 and two brake rubber block 103,104 air spotss are capable, steel rope 1 does not contact with two brake rubber blocks 103,104 yet.
As shown in Fig. 6, Fig. 8, described the first spring 301 is set on first sleeve pipe 303 and the second sleeve pipe 304 of relative axial alignment separately with the second spring 302, the first sleeve pipe 303 internal upper part covers have the first pilot bar 305 that can relative sliding, bottom cover has the 3rd pilot bar 307, the second sleeve pipe 304 is so same, its internal upper part cover has the second pilot bar 306 that can relative sliding, and bottom cover has the 4th pilot bar 308.The upper end of the first pilot bar 305 and the second pilot bar 306 is fixed on cam follower 201.The upper end of the first spring 301 and the second spring 302 is separately installed with the first cap 309 and the second cap 310, and their shape is made when cam follower 201 moves and can be coordinated and be held on cam follower 201.Or the upper end of the first spring 301 and the second spring 302 can be fixed on cam follower 201 by other desirable modes.The 3rd pilot bar 307 and the 4th pilot bar 308 are all to form the cylinder with step by small column and big column two parts, and the lower end abutment of the first spring 301 and the second spring 302 is on great circle cylinder.Three, on the big column of the 4th pilot bar 307,308, have the through hole that is in alignment with each other and is parallel to cam follower 201 axis, in these two through holes, cross-under has the two ends of the 3rd adapter shaft 311, the three adapter shafts 311 to be fixed on first, second side plate 601,602.
As Fig. 1, 3, 7, shown in 9, wire holder described in the utility model also comprises spring compression means 400, this device can be set to first by wire holder, the second spring 301, 302 releasing positions by compression, it comprises motor 410, gear case 420, overriding clutch 430, sprocket wheel-belt driver 440, described motor 410 is installed on a side drive gear casing 420 work of gear case 420, gear case 420 is arranged on gear case adapter plate 421, gear case adapter plate 421 is arranged on the upper surface of the first side plate 601 and the second side plate 602, on the output shaft 422 of gear case 420, be set with successively the minor sprocket 441 on sprocket wheel-belt driver 440, the first half-clutch device 431 of overriding clutch 430 and the second half-clutch device 432, minor sprocket 441 and the first half-clutch device 431 one process or both are combined into one by connecting element, both do not rotate with output shaft 422, and the second half-clutch device 432 is installed on output shaft 422 and with output shaft 422 rotations by key, steel ball is installed between described the second half-clutch device 432 and output shaft 422 and can under the rolling of steel ball, relatively moves, when the second half-clutch device 432 moves and mutually engages to the first half-clutch device 431, the second half-clutch device 432 can be given the first half-clutch device 431 by the transmission of torque of output shaft 422, and then minor sprocket 441 is rotated.As shown in Figure 5, described overriding clutch 430 comprises coil pack 434, moving iron core member 435, base 437, locating pin bracket 439 and fork 433, base 437 is fixed on gear case 420, coil pack 434 is arranged on base 437 inside, moving iron core member 435 is arranged in the inside of coil pack 434, the part that moving iron core member 435 stretches out coil pack 434 has through hole, centre is installed with pin 436, on base 437, be also fixed with locating pin bracket 439, in locating pin bracket 439, also have through hole, centre is installed with locating dowel pin 438, pin 436 is parallel with locating dowel pin 438 and for fork 433 is installed, the other end of fork 433 is connected with the second half-clutch device 432.When motor 410 and overriding clutch 430 are all switched on, motor 410 drive gear casing 420 work, the output shaft 422 of gear case 420 rotates the second half-clutch device 432, and the coil pack 434 of overriding clutch 430 is because producing electromagnetic force between energising and moving iron core member 435, electromagnetic force makes iron core member 435 move towards gear case 420 directions, moving iron core member 435 drives fork 433 to rotate around locating dowel pin 438 by pin 436, thereby the other end that makes fork 433 drives the second half-clutch device 432 to shift to the first half-clutch device 431, both are engaged, finally make minor sprocket 441 rotate.What when the second half-clutch device 432 is shifted to the first half-clutch device 421 here, be subject to is the force of rolling friction from steel ball, rather than the force of sliding friction of general power-transfer clutch because not having steel ball to be subject to, reduced the friction force that the second half-clutch device 432 is subject to, two halves power-transfer clutch can be engaged rapidly, and prolonged mechanical service life.
As Fig. 7, 8, 9, 11, shown in 13, described sprocket wheel-belt driver 440 under the driving of motor 410 by cam follower 201 to first, the second slit 207, 208 first, the second end 209, 210 directions are drawn, thereby compression first, the second spring 301, 302, it comprises minor sprocket 441, hinge wheel 442 and track adjusting wheel 443 with minor sprocket 441 same planes settings, be engaged on the chain 444 on minor sprocket 441 and Dalian wheel 443, the 4th adapter shaft 445 of hinge wheel 442 is housed by key fixed cover, for pulling the elevator band 447 of cam follower 201, described Dalian wheel 442 is near the second side plate 602, described track adjusting wheel 443 presses to the portion of chain of a side portion of chain of opposite side, dwindling chain gear takes up space, make arrangement of parts compacter.Described the 4th adapter shaft 445 can rotate relative to the first side plate 601 and the second side plate 602, being fixed on the second side plate 602 of its one end pivotable near the second side plate 602, its one end near the first side plate 601 is arranged on bearing seat 446 by bearing, and bearing seat 446 is fixed on the first side plate 601 by connecting element.Described elevator band 447 is high-intensity fabric belt or metal steel band, its one end is installed on the middle part of the 4th adapter shaft 445, the middle part of the 4th adapter shaft 445 has wedged hole, the head of elevator band 447 is wound in the outer round surface of the 4th adapter shaft 445 after walking around a voussoir 448 and being flush-mounted in wedged hole together with voussoir 448, when elevator band 447 draws tighter and tighter, elevator band 447 heads and voussoir 448 can be pressed from both sides tighter and tighter, thereby make more difficult drop-off of elevator band 447 heads.The other end of elevator band 447 is fixedly mounted on the 3rd adapter shaft 311 after walking around the bearing 212 of installing at the first adapter shaft 202 middle parts.From Fig. 8,11,13, if the 4th adapter shaft 445 rotates along direction A, elevator band 447 will be wound on the 4th adapter shaft 445, thereby cam follower 201 is drawn towards first, second end 209,210 directions of first, second slit 207,208, compress first, second spring 301,302, discharge steel rope 1.
As Fig. 3, 7, shown in 9, when wire holder discharges steel rope 1 end, latching device 500 described in the utility model will pin the first spring 301 and the second spring 302 in compressed state, this latching device 500 comprises coil pack 501, moving iron core member 502, base 503, coil pack 501 is sleeved on the outside of moving iron core member 502 and is placed in the inside of base 503, base 503 is fixed on mounting base 504, mounting base 504 is fixed on determines braking vane 101 in the face of on the face of cam follower 201, on mounting base 504, be also fixed with a fixed block 510, the both sides of this fixed block 510 are by two connecting panels 508 that are connected with of connecting pin pivotable, described moving iron core member 502 lower ends are connected to a jacking block 505, jacking block 505 both sides are connected with two blocks of carrier bars 511 by pin, other end inner side and the other end of two connecting panels 508 of two blocks of carrier bars 511 link together by bearing pin 507 and locking piece, carrier bar 511 and connecting panel 508 can be relatively rotated with respect to each other.Between two connecting panels 508, have a roller 506 to be sleeved on bearing pin 507, this roller 506 can be relative to rotating with bearing pin 507.This latching device 500 also comprise one be fixedly installed in cam follower 201 middle parts can with the claw 509 of roller 506 tablings.When wire holder is in releasing position, first, second spring 301,302 is by compression time, coil pack 501 energisings, between coil pack 501 and moving iron core member 502, produce electromagnetic force, this electromagnetic force makes iron core member 502 move towards cam follower 201, roller 506 is embedded in the draw-in groove of claw 509, and coil pack 501 keeps energising, makes first, second spring 301,302 in compressed state.
As shown in Fig. 3,6, normal open switch 2a and normally closed switch 2b are installed on the mounting base 504 of catch gear 500, both share a trigger arm 3.L shaped triggering block 215 is installed on cam follower 201, and a flanging of L shaped triggering block 215 is installed on cam follower 201 by screw, is through screw 216 sufficient length and that stretch to trigger arm 3 on another flanging of L shaped triggering block 215.When the first spring 301 and the second spring 302 are completely by compression time, cam follower 201 arrives bottom, screw 216 touches trigger arm 3, normally closed switch 2b is opened, make motor 410 and overriding clutch 430 power-off, sprocket wheel-belt driver 440 is transmitting torque no longer, does not recompress the first spring 301 and the second spring 302; Normal open switch 2a is closed, and catch gear 500 energisings, are locked at confined state by the first spring 301 and the second spring 302.
As shown in Fig. 3,11,13, brake rubber block wearing and tearing switch 4 is also installed on mounting base 504, brake rubber block wearing and tearing switch 4 is normally closed switchs, trigger arm 5 is installed on it, when the first brake rubber block 103 and the second brake rubber block 104 be not when wearing and tearing or part are worn and torn, first, second spring 301,302 discharges, and moves but can not touch trigger arm 5, as shown in figure 11 on cam follower 201; When the first brake rubber block 103 and the second brake rubber block 104 may wear to limit, as shown in figure 13, when moving upward to vertex, cam follower 201 will touch trigger arm 5, disconnection valve shelling damages switch 4, make motor 410 and overriding clutch 430 must not electricity, spring compression means 400, by inoperative, can not compressed the first spring 301 and the second spring 302, and wire holder is waited for maintenance in braking mode.
Circuit diagram shown in Figure 14 is controlled the operation of wire holder and car, and dotted line is wire holder part with interior device.Lead-in wire 9 and 10 is connected with automatic/hand change-over switch 6 and normal open switch 2a respectively, and when automatic/hand change-over switch 6 is opened, this switch discharges the first spring 301 and the second spring 302, and prevention car moves.When the first spring 301 and the second spring 302 are by compression time, touch brake control lever 3, make normal open switch 2a closed, car moves.Therefore,, if the first spring 301 and the second spring 302 are not by compression, car just can not move.
Lead-in wire 11 and 12 extends to apparatus for controlling elevator, lead-in wire 11 is connected with a normally closed master cock 8, a test switch 7 and brake rubber block wearing and tearing switch 4, when test switch 7 disconnects, thereby release the first spring 301 and the second spring 302 are applied to the first brake rubber block 103 and the second brake rubber block 104 on steel rope 1.And master cock 8 just can be opened while only receiving the signal of control system, control system detects car speeding, car door will send the signal that disconnects master cock 8 when car leaves floor ground while opening, and makes wire holder power-off clamp steel rope 1.And only have when first, second brake rubber block 103,104 may wear to limit, for example, when cam follower 201 arrives the limit of its upward movement, brake rubber block wearing and tearing switch 4 is opened, and circuit disconnects, and discharges the first spring 301 and the second spring 302.
When master cock 8, test switch 7 and brake rubber block wearing and tearing switch 4 are closed, the coil pack 501 of catch gear 500 is only just switched on by circuit when normal open switch 2a is closed.When normal open switch 2a is closed, by compression, the coordinating of the roller 506 based on catch gear 500 and claw 509 makes the first spring 301 and the second spring 302 be held in state by compression for the first spring 301 and the second spring 302.If in master cock 8 or test switch 7 or brake rubber block wearing and tearing switch 4, any is disconnected, the coil pack 501 of catch gear 500 will power-off, roller 506 is no longer fastened in the draw-in groove of claw 509 because being subject to downward electromagnetic force, this just makes the first spring 301 and the second spring 302 discharge from compressive state, thus, cause the first brake rubber block 103 and the second brake rubber block 104 to clamp steel rope 1.
After motor 410 and overriding clutch 430 is in parallel and normally closed switch 2b be connected in series between power supply lead wire 11 and 12, when wire holder is switched to the process of release position from braking mode, normally closed switch 2b is closed, motor 410 and just energising of overriding clutch 430, both operations are compressed the first spring 301 and the second spring 302 by sprocket wheel-belt driver 440.When the first spring 301 and the second spring 302 completely by compression, wire holder discharges while finishing, trigger arm 3 is touched, normally closed switch 2b disconnects, motor 410 and overriding clutch 430 power-off, both quit work, and do not recompress the first spring 301 and the second spring 302.
From the above, under normal running (operation) conditions, by compression, the first brake rubber block 103 and the second brake rubber block 104 of determining braking vane 101 and moving braking vane 102 are spaced apart, and steel rope 1 is free to by therebetween for the first spring 301 and the second spring 302.Yet, if elevator cage operation hypervelocity, or car door moves apart floor ground motion while opening, and control system will disconnect master cock 8 after detecting, make coil pack 501 dead electricity of latching device 500, thereby discharge the first spring 301 and the second spring 302, so the first brake rubber block 103 and the second brake rubber block 104 will clamp steel rope 1 and stop car movement.
Please continue to refer to each view, narrate principle of work of the present utility model:
During beginning, as shown in Fig. 4,6,7,8,9, suppose that elevator device is without any fault, wire holder is in static or releasing position.After braking starts, the releasing of the first spring 301 and the second spring 302 parts compression, according to moving, determine braking vane 102,101 and be applied to the final gripping power on steel rope 1, that steel rope 1 remains on is moving, determine between braking vane 102,101, and motor 410 no powers.
As shown in Fig. 5,7,8,11, normally closed switch 2b and brake rubber block wearing and tearing switch 4 are in normally closed position, and when wire holder is switched on, wire holder is switched to releasing position from braking position, thereby starts dispose procedure.Now motor 410 and overriding clutch 430 are all switched on, motor 410 energisings cause output shaft 422 to rotate along direction A, overriding clutch 430 energisings, between coil pack 434 and moving iron core member 435, will produce electromagnetic force, electromagnetic force makes iron core member 435 band untie-sells 436 move towards gear case 420 directions, pin 436 drives again fork 433 to rotate around locating dowel pin 438, thereby the second half-clutch device 432 that makes to be arranged on fork 433 other ends moves to the first half-clutch device 431, thereby both engagings, minor sprocket 441 rotates along direction A under the associating gearing of overriding clutch 430, transmission by chain 444 causes again hinge wheel 442 to rotate along direction A, the rotation of Dalian wheel 442 causes the 4th adapter shaft 445 to rotate along direction A, the rotation of the 4th adapter shaft 445 is wound around thereon elevator band 447, thereby pull cam follower 201 to move down along the first cam 205 surfaces and the second cam 206 surfaces, thereby make the first spring 301 and the second spring 302 by compression.
As shown in Figure 6, when the first spring 301 and the second spring 302 complete when compressed, wire holder is in releasing position.Screw 216 touches normal open switch 2a and normally closed switch 2b, closed normal open switch 2a, disconnect normally closed switch 2b, make motor 410 and overriding clutch 430 power-off, between moving iron core member 435 and coil pack 434, lose electromagnetic force, fork 433 rotates towards the direction away from coil pack 434 around locating dowel pin 438, makes the second half-clutch device 432 leave the first half-clutch device 431, and the torque of gearbox output shaft 422 cannot be passed to minor sprocket 441.Normal open switch 2a is closed, makes catch gear 500 energisings, pins cam follower 201, makes first, second spring 301,302 in compressed state, thereby keeps wire holder in release position.
When elevator device detects abnormal condition, wire holder can be switched to braking mode from release position, and braking starts moment, system cut-off, catch gear 500, with regard to power-off, unclamps the coupling mechanism force to cam follower 201, removes the locking to the first spring 301 and the second spring 302.The first spring 301 and the second spring 302 start to remove compression, cam follower 201 moves up rapidly along the first cam 205 surfaces and the second cam 206 surfaces under the elastic force effect of the first spring 301 and the second spring 302, thereby follower pulls elevator band 447 to make the 4th adapter shaft 445 along direction B twirl in the process moving up, cause Dalian wheel 442 along direction B twirl, Dalian wheel 442 makes minor sprocket 441 rotate along direction B by chain 444, because system makes wire holder dead electricity, so overriding clutch 430 is because no power makes the first half-clutch device 431 separated with the second half-clutch device 432, the rotating speed of minor sprocket 441 can not pass to gear case 420, so can not damage gear case 420.
When the first brake rubber block 103 and the second brake rubber block 104 do not have noticeable wear, cam follower 201 does not arrive the surperficial top of the first cam 205 and the second cam 206, as shown in figure 11.When the first spring 301 and the second spring 302 extend until wear and tear and reach scheduled volume along with the wearing and tearing of the first brake rubber block 103 and the second brake rubber block 104, the power of the first spring 301 and the second spring 302 doubles and keeps constant.While thinning down when the first brake rubber block 103 and the wearing and tearing of the second brake rubber block 104, cam follower 201 further moves with compensate for wear on the first cam 205 surfaces and the second cam 206 surfaces, when cam follower 201 is encountered the shake-up arm 5 of brake rubber block wearing and tearing switch 4, as shown in figure 13, disconnection valve shelling damages switch 4, motor 410 power-off are not moved, need to safeguard wire holder.
When elevator device power-off, wire holder is in braking mode, the first spring 301 and the second spring 302 are in uncompressed state, now manually pull elevator band 447, cam follower 201 is moved down along the first cam 205 surfaces and the second cam 206 surfaces, cause the first spring 301 and the second spring 302 pressurizeds, thereby make the first connecting panel 203 and the second connecting panel 204 drive moving braking vane 102 away from determining braking vane 101, unclamp the clamping to steel rope 1, manually declutch fairly simple.
The beneficial effect of the utility model elevator wire rope wire holder is: the utility model adopts after said structure, there is one of advantage, adopt sprocket wheel chain gear and belt-driving, two kinds of drivings device are with respect to gear system or power hydraulic system, and simple in structure, strong shock resistance, good braking effect, environment friendly and pollution-free, operating maintenance convenient;
Advantage two, at wire holder during in release position, by compression, belt is wound on the 3rd adapter shaft spring, but sprocket wheel-belt driver do not stress, and only has catch gear to the cam follower application of force, so can extend the service life of driving device;
Advantage three, the second half-clutch device of described overriding clutch is to the first half-clutch device, moved and engage under the effect of electromagnetic force by steel ball, thereby by the transmission of torque of gearbox output shaft to sprocket wheel-belt driver, in this process, what the second half-clutch device was subject in moving process is force of rolling friction, less than the force of sliding friction that in general power-transfer clutch, half-clutch device is subject to, so the frayed mild degree of overriding clutch, service life is relatively long;
Advantage four, the track adjusting wheel in described sprocket wheel-belt driver presses to the portion of chain of a side portion of chain of opposite side, dwindling chain gear part takes up space, make spring installation and cam follower install and arrange near chain part, make arrangement of parts compacter.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model description to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present utility model.

Claims (10)

1. an elevator wire rope wire holder, comprising:
Brake gear, comprises determining braking vane and the moving braking vane of the second brake rubber block being installed of the first brake rubber block is installed;
Cam gear, described cam gear is connected on moving braking vane, and it comprises the first cam, the second cam and cam follower;
Spring installation, described spring installation is connected on the cam follower of described cam gear;
Spring-compressed mechanism, described spring-compressed mechanism is connected on the cam follower of described cam gear;
Latching device, described latching device is connected on the cam follower of described cam gear;
It is characterized in that: described spring-compressed mechanism comprises the sprocket wheel-belt driver consisting of sprocket chain strip transmission mechanism and hoisting mechanism, when wire holder brake wire, spring in spring installation discharges from compressive state, thereby spring actuating cam follower drives moving braking vane towards determining braking vane motion, finally makes the first brake rubber block and the second brake rubber block clamp steel rope; When wire holder discharges steel rope, thereby the spring of sprocket wheel-belt driver in the drop-down moving cam follower of the effect compression spring device of power makes braking vane away from determining braking vane, thereby discharges steel rope.
2. a kind of elevator wire rope wire holder according to claim 1, it is characterized in that: described sprocket wheel-belt driver comprise minor sprocket, with the hinge wheel of minor sprocket same plane setting, be engaged on chain on minor sprocket and Dalian wheel, by key fixed cover the 4th adapter shaft of hinge wheel is housed, for pulling the elevator band of cam follower, described elevator band one end is wound in the middle part of the 4th adapter shaft, and the other end is connected on the connecting element of spring installation after walking around the axle of cam follower.
3. a kind of elevator wire rope wire holder according to claim 2, it is characterized in that: the middle part of described the 4th adapter shaft has wedged hole, the head of elevator band is wound in the outer round surface of the 4th adapter shaft after walking around a voussoir and being flush-mounted in wedged hole together with voussoir.
4. a kind of elevator wire rope wire holder according to claim 2, is characterized in that: the middle part of the axle of described cam follower is set with antifriction-bearing box, and described elevator band is around hanging on this antifriction-bearing box.
5. a kind of elevator wire rope wire holder according to claim 2, is characterized in that: described sprocket wheel-belt driver also comprises the track adjusting wheel arranging with minor sprocket and Dalian wheel same plane.
6. a kind of elevator wire rope wire holder according to claim 1, is characterized in that: described spring-compressed mechanism also comprises motor and gear case.
7. a kind of elevator wire rope wire holder according to claim 5, it is characterized in that: described spring-compressed mechanism also comprises overriding clutch, described overriding clutch is for coordinates transmission of torque so that motor and gear case are exported to sprocket wheel-belt driver with sprocket wheel-belt driver at wire holder dispose procedure, thus the spring in compression spring device; In wire holder braking procedure, be that in the process of the spring releasing compression in spring installation, overriding clutch disengaging coordinates with sprocket wheel-belt driver.
8. a kind of elevator wire rope wire holder according to claim 7, it is characterized in that: described gear case comprises output shaft, described overriding clutch comprises the first half-clutch device and the second half-clutch device, on the output shaft of gear case, be set with successively minor sprocket, the first half-clutch device and the second half-clutch device, minor sprocket and the first half-clutch device one processes or both are combined into one by connecting element, both are not with output shaft rotation, and the second half-clutch device is along with output shaft rotation, when the first half-clutch device and the second half-clutch device match, the second half-clutch device can be given the first half-clutch device by the transmission of torque of output shaft, and then minor sprocket is rotated.
9. a kind of elevator wire rope wire holder according to claim 8, is characterized in that: between described the second half-clutch device and the output shaft of gear case, steel ball is installed.
10. a kind of elevator wire rope wire holder according to claim 8, it is characterized in that: described overriding clutch also comprises coil pack, moving iron core member, locating pin bracket and fork, moving iron core member is arranged in the inside of coil pack, the part that moving iron core member stretches out coil pack is connected in the middle part of fork, described fork one end is fixedly installed in locating pin bracket by locating dowel pin, the described fork other end is connected with the second half-clutch device, thereby fork can be under the electromagnetic force producing between coil pack and moving iron core member rotates and realizes coordinating of the second half-clutch device and the first half-clutch device around locating dowel pin.
CN201320526573.9U 2013-08-22 2013-08-27 Elevator steel wire rope holder CN203486698U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103434912A (en) * 2013-08-22 2013-12-11 常熟市琴茂机械有限公司 Steel wire rope clamping device of elevator
EP3208223A4 (en) * 2014-10-14 2018-06-06 Hangzhou Huning Elevator Parts Co., Ltd. Automatic reset steel wire rope brake
CN110422720A (en) * 2019-08-20 2019-11-08 武汉市云竹机电新技术开发有限公司 Vertical-lift full-range over speed protects system
CN111032555A (en) * 2018-05-07 2020-04-17 G.A.L.生产有限责任公司 Elevator emergency brake with brake shoe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104261297B (en) * 2014-09-17 2016-06-01 苏州通润驱动设备股份有限公司 The drift stop of a kind of elevator traction sheave
CN104816999B (en) * 2015-05-12 2017-01-18 锦州市特种设备监督检验所 Rapid rope disassembly and assembly device for elevator speed governor
CN105540383B (en) * 2016-02-26 2018-05-18 上海盛蒂斯自动化设备股份有限公司 Prevent the rope brake device of car accidental movement
CN106429709A (en) * 2016-12-09 2017-02-22 佛山市南海区永通力电梯配件厂(普通合伙) Rope gripper

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228540A (en) * 1992-07-24 1993-07-20 Hollister-Whitney Elevator Corp. Elevator car brake with shoes actuated by springs
KR100609836B1 (en) * 2004-04-23 2006-08-11 주식회사 엘텍 Rope braking device for elevator
CN1789102B (en) * 2004-12-17 2010-12-08 中国建筑科学研究院建筑机械化研究分院 Elevator overspeed protecting device
KR100624093B1 (en) * 2005-01-24 2006-09-20 (주)금영제너럴 Oil-pressure generating apparatus for the safety braking apparatus of the elevator system
KR100851566B1 (en) * 2006-09-11 2008-08-18 조길희 The rope braking device for an elevator
CN201400495Y (en) * 2009-05-07 2010-02-10 河北东方富达机械有限公司 Rope gripper for elevator
JP5714345B2 (en) * 2011-01-27 2015-05-07 東芝エレベータ株式会社 Elevator brake system
CN103086225B (en) * 2012-12-11 2016-01-20 杭州奥立达电梯有限公司 Anti-slip protection device for elevator
CN203486698U (en) * 2013-08-22 2014-03-19 常熟市琴茂机械有限公司 Elevator steel wire rope holder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103434912A (en) * 2013-08-22 2013-12-11 常熟市琴茂机械有限公司 Steel wire rope clamping device of elevator
EP3208223A4 (en) * 2014-10-14 2018-06-06 Hangzhou Huning Elevator Parts Co., Ltd. Automatic reset steel wire rope brake
CN111032555A (en) * 2018-05-07 2020-04-17 G.A.L.生产有限责任公司 Elevator emergency brake with brake shoe
CN110422720A (en) * 2019-08-20 2019-11-08 武汉市云竹机电新技术开发有限公司 Vertical-lift full-range over speed protects system

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