The brake equipment or the safety tongs that are used for lift car
Technical field
The present invention relates to brake equipment preamble, that be used for lift car or safety tongs according to claim 1.
Background technology
Elevator is equipped with brake equipment or safety tongs, is used for stop elevator car under the situation of unallowed high-speed cruising, when this high-speed cruising for example may appear at control setup generation functional fault or wire cable rupture.
In known this device, start brake equipment or safety tongs by the velocity limiter that is fixedly mounted in hoistway or the machine room, when elevator cage operation, will impel velocity limiter to rotate.For this reason, be provided with the speed limit rope of a closure, it one walk around velocity limiter (usually in hoistway extreme higher position), tension wheel (extreme lower position in hoistway usually) is walked around in the other end.The speed limit rope is connected with the brake equipment or the safety tongs of lift car at the three unities, thereby is driven when elevator cage operation.If speed is too high, velocity limiter locking speed limit rope then, the result, brake equipment or safety tongs are triggered and stop elevator car thus.
The advantage of this structure is that it is mechanically worked merely, therefore the influence that can not be had a power failure.
But it has many shortcomings.On the one hand, it is out of order easily, and this mechanically works merely because of it exactly.If it becomes very dirty, then centrifugal pendulum only can just trigger (promptly only exceed in speed and just trigger when a lot) very late.
Another shortcoming is that cost is high relatively.Cast aside real brake equipment and do not talk, need the rope of a rhizosphere in the whole hoistway scope, it must be directed at two up and down, also must be tensioned.
Another shortcoming is that the solution of this machinery is only made a response when exceeding predetermined speed.Concerning present express elevator, this is normally not enough.This elevator is with the operation of the speed of for example 10 meter per seconds, so it must in time be braked before arriving final (top or the end) floor.If it is descending that lift car is at the second layer, then have only the speed of 5 meter per seconds also too high, thereby should trigger emergency braking.
In order to trigger emergency braking discriminatively, the solution of electronics is more suitable.Also the someone has proposed corresponding scheme.U.S. Pat 5,020,640 disclose a kind of brake device for elevator, and wherein the speed of lift car is measured by drive wheel, and hoist cable is on this drive wheel.
Usually, in elevator, be provided with the counterweight that is used for lift car.Design-calculated according to counterweight and other structural element is different, supposes that sometimes lift car only can reach too high speed when descending.But people must consider too high speed again sometimes when up, and for example when empty ladder, lift car is compared heavy and light, and therefore when control setup lost efficacy, it is up that counterweight quickens lift car.
Constitute the U.S. Pat 5 of same type, 366,045A discloses a kind of brake equipment or safety tongs of the above-mentioned type, here, pressure body has two bevelled plane of action, and two wedge shape brake components (voussoir) that work in the guide rail both sides abut on the above-mentioned plane of action.In addition, a screw actuator constitutes holding element, and this screw actuator overcomes spring force brake component is remained on such position, promptly on this position, leaves the slit between the friction face of brake component and guide rail at that time.If screw actuator is gone excitation, then spring is pressed into brake component in the slit between pressure body plane of action and the guide rail, that itself dwindles up, and the result frictional engagement occurs between brake component and guide rail, and the thrust of brake component is further increased.
But, find that in this known occasion the brake action of enhancing only appears at lift car when descending.When up, the frictional engagement that occurs between guide rail and brake component has played the effect that reduces braking force.Put a last floor on the lift car of stop with regard to making thus, this is favourable.But its shortcoming is to fail to produce emergency braking when up.
Also there is following problem in this known solution, promptly especially when guide rail position is wrong, the one-sided guide rail that acts on of brake component may occur, and lift car appears in the possibility of result, and then guide rail occurs and be badly damaged.This reinforcement degree that results from braking force depends on braking force itself (i.e. friction).If the friction ratio of a side is less, then thrust is also less, the result, and braking force totally reduces a lot.
Summary of the invention
The device that the objective of the invention is to avoid these defectives and propose a kind of the above-mentioned type, its feature be simple in structure and job security very high.It should not be only applicable to mechanical flip flop equipment, and is applicable to electric flip flop equipment.
According to the present invention, in the brake equipment or safety tongs of the above-mentioned type, the characteristic feature by claim 1 has realized this purpose.
The measure of passing through to be proposed has guaranteed that the friction face of brake component just is connected on the guide rail with set pressure, has avoided the danger of presses against track lopsidedly thus, and such danger may appear in the above-mentioned known solution.By setting the gap depth and groove (the forming a kind of crescent) degree of depth, can adjust any desirable inhibitory action when the stop elevator car by simple mode.Roller will roll on guide rail on (in case roller contact guide rail), be pressed into thus in the slit and to the end, in other words, abut in the place, slit on groove next door up to convex shoulder always.The guide rail of Chu Xianing has been determined thrust with the distance between the groove (slightly less than the roller diameter) with the elasticity of material there.
By the feature of claim 2, can realize the stop of lift car with plain mode, no matter lift car is in up, still in descending.In addition, also can guarantee that in simple mode different service directions have different hysteresis value with groove depth by the respective settings gap depth.At last, hysteresis value should be no more than 1g (g is an acceleration due to gravity) under uplink situation, this be because otherwise the passenger can fly away from the lift car floor, injured substantial risk can appear falling down in the result.
In order to reduce the impaired danger of guide rail under the situation of braking hindering for some reason as far as possible, the feature of adopting claim 3 is favourable.
By this measure, can avoid guide rail to bear pressure, the situation that when connecting two pressure bodies corresponding to different guide rails with rigid support, pressure just may occur bearing.In addition, such brake equipment also is applicable to following elevator, and promptly lift car only moves on one or two is fixed in the guide rail of same well enclosure.
By the feature of claim 4, reached the reduced stiffness of a pressure body part (corresponding to the up direction of lift car), the result, the thrust of brake component is reduced in the up braking of lift car.Thus one, when glancing impact on up direction, obtained smaller inhibitory action, thereby can avoid the passenger to fly away from the floor of lift car by simple mode.
Feature by claim 5 has obtained one from the very simple solution of structure.
Thus one, can in servicely keep brake component normal by simple mode according to the near distance of the upper surface of distance respective track.Under the situation that brake equipment is triggered, will make roller touch guide rail reliably and make roller begin to rotate, thus one, roller rolls to one of the slit and is pressed onto more and more tightly on the guide rail and clamped, has occurred the stop of lift car thus.
Description of drawings
Now, describe the present invention in conjunction with the accompanying drawings in detail.Wherein:
Fig. 1 schematically illustrates according to brake component of the present invention;
Fig. 2 schematically illustrates according to brake equipment of the present invention or safety tongs with horizontal sectional view;
Fig. 3 shows this brake equipment or safety tongs along the arrow III direction of Fig. 2.
The specific embodiment
As shown in Figure 2, guide rail 2 has the rail head 8 that is connected with the flange of rail 7 by web 6.
In brake equipment according to the present invention or safety tongs, be provided with the brake component that is roller 9 shapes, on two end faces 10 of roller, be provided with convex shoulder 11 (referring to Fig. 1).The outer peripheral face of roller 9 plays the effect of friction face 12.For this reason, it has annular knurl structure or friction lining, and it is designated to be used to be connected to guide rail 2 (participation Fig. 2).
Fig. 2 illustrates brake equipment 14 of the present invention with the horizontal section.This brake equipment has pressure body 19, and it corresponds essentially to U-shaped, and here, two legs 16,16 ' of U-shaped are clamped guide rail 2 in its free end region.
Be provided with slit 20 on the leg 16 of pressure body 19, roller 9 is imported into this slit.In addition, slit 20 has groove 21, and this groove can hold the friction face 12 (referring to Fig. 1) of roller 9.
Roller 9 remains on the axle 22 (not shown among Fig. 2, referring to Fig. 3) rotationally, and this passes the breach 23 in the leg 16 and is maintained in the bearing 25.
Bearing 25 is entangled by spring 28, and this spring is the stage clip form and at the direction pretension nip drum post 9 towards guide rail 2.Spring 28 is opposite with the effect of screw actuator (not shown), and this screw actuator is controlled by the mechanism of a monitoring elevator car speed.In addition, when detecting elevator cage operation when too fast, screw actuator is gone excitation.Thus one, spring 28 forces bearing 25 to move, and then makes roller 9 shift to guide rail 2, the result, and this roller is resisted against on the guide rail 2 (see figure 3) and is driven with its friction face 12 (referring to Fig. 1) and rotates.
The axle 22 of roller 9 also can be fixed on the conventional rope of common velocity limiter and by this rope to be brought in the slit 20 that itself dwindles.Therefore, this safety tongs is applicable to electric means (by removing the screw actuator of excitation) or mechanical system (passing through rope) and is activated.
When lift car was descending, roller 9 clockwise rotated (referring to Fig. 3 the time).Thus one, roller 9 rolls on guide rail 2 and to rising.Because the distance between groove 21 and the guide rail 2 is dwindled up, so this roller is clamped between groove 21 and guide rail 2, the result, this roller rubs in groove 21 also thereby is braked, thus unshowned lift car is by stop.On the final position, friction face 12 (see figure 1)s are (see figure 3) contact groove 21 on position 41, and on position 42, the slit 20 on convex shoulder 11 (see figure 1)s of roller 9 contact groove 21 next doors.On position 42, the degree of depth of groove 21 is correspondingly big, thereby friction face 12 (see figure 1)s do not contact groove 21 (see figure 3)s there.In this way, the motion distance of roller 9 is restricted, but this has no significant effect braking force, and this is because the friction quite little (convex shoulder is smooth) of (see figure 1) in convex shoulder 11 zones.Green phase answer setting slot 21 apart from guide rail 2 apart from (see figure 3), can correspondingly pre-determine the inhibitory action that occur this moment.Because bearing 25 can be swung and owing to be provided with breach 23, so roller 9 can be in the clear 20 moved along the slit.
When glancing impact in up, only need smaller braking force this moment, roller 9 rotates counterclockwise and thereby rolls downwards.
Slit 20 (perhaps groove 21) roughly has depression 31 at the center, be used for determining the inefficacy dead position.Roller 9 is drawn into this inefficacy dead position by the screw actuator of excitation.At this moment, between guide rail 2 and roller 9, leave the gap.
In form of implementation shown in Figure 3,, in lower area, be provided with otch 32 in order to reduce the rigidity of pressure body 19.So, pressure body 19 corresponding to up part in produced the corresponding rigidity that reduces, and then produced the thrust of smaller roller 9, the result smaller inhibitory action occurred at glancing impact.
The latter also can by on the depression 31 and under corresponding the walking always of groove 21 that differently design realize.
Claims (according to the modification of the 19th of treaty)
1, a kind of brake equipment or safety tongs that is used for lift car, described lift car moves along vertical guide rail (2) in hoistway, the brake component that wherein has a friction face (12) is maintained on the pressure body (19) on the described lift car of being placed in of described brake equipment in a movable manner, and described brake component is abutted on the guide rail (2) from the inefficacy dead position of being determined by holding element, wherein said brake component is made of roller (9), the trend of the axis of described roller is vertical perpendicular to described guide rail (2), the outer peripheral face of described roller is the form of friction face (12), the convex shoulder that described roller contracts later on (11) is imported at described pressure body (19) one movably and is parallel in the slit (20) that corresponding guide rail (2) extends, wherein said slit (20) has the groove (21) of the friction face (12) that is used to hold described roller (9), described groove (21) towards at least one end have dwindle apart from guide rail (2) spacing, thereby described roller (9) is on such position (position 41), be that the friction face (12) of described roller is attached on the one hand described guide rail (2) and goes up and be resisted against on the other hand in the described groove (21), described roller (9) also is on such position (position 42), be that the slit (20) that the convex shoulder (11) of described roller is resisted against described groove (21) next door is located, thereby prevent that described roller (9) is moved further, and described roller (9) is connected with the holding element of determining its inefficacy dead position, it is characterized in that, described slit (20) and described groove (21) extend to both sides from the depression (31) of determining described inefficacy dead position, described holding element has the screw actuator of settling swingably, described roller (9) is depressed into cooresponding guide rail (2) in advance by spring (28), described spring (28) is the stage clip form, described roller (9) towards the direction of guide rail (2) by pretension, the effect of described spring (28) is opposite with described screw actuator, described screw actuator is controlled by the mechanism of a monitoring elevator car speed, and have when too high-speed when detecting lift car, described screw actuator is gone excitation, thus one, described spring (28) make bearing (25) and and then make described roller (9) shift to described guide rail (2), thereby described roller is resisted against on the described guide rail (2) with its friction face (12), and quilt is driven rotation and rolls on described guide rail.
2, brake equipment according to claim 1 or safety tongs is characterized in that, clamp described guide rail (2) behind the described pressure body (19).
3, brake equipment according to claim 1 and 2 or safety tongs is characterized in that, described pressure body (19) is at the otch (32) that extends perpendicular to described guide rail (2) that itself has in the zone of extendible portion down of described slit (20).