The elevator speed-limiting safety jaw
Technical field
The present invention relates to a kind of elevator speed-limiting safety jaw of elevator industry, specifically a mechanical device that is installed in the car bottom to the pulling force of a machinery of safety tongs, makes safety tongs can block the device of hoistway guide rail when the car overspeed.
Background technology
Traditional velocity limiter is loaded in the machine room of elevator hoistways top layer, and the safety tongs of elevator is another independent brake equipment, is installed in the car bottom.Normally utilize the steel rope that is suspended in the governor rope race to be connected with the safety tongs connecting rod mechanism of car bottom, and extend to bottom the hoistway always, walk around in the rope sheave groove that the tension wheel that is installed in the pit turns back to elevator hoistways top layer velocity limiter again, constitute circulation and connect.When cage operation surpasses command speed, rope sheave rotating speed on the velocity limiter quickens and surpasses to set rotating speed, centrifugal on the rope sheave button is driven spring buckle under centrifugal action, makes steel rope voussoir locking steel rope, and this moment, car was still done overspeed, so car and steel rope produce a relative motion, the power of this relative motion is stirred the catch gear of safety tongs, with the wedging of the voussoir in safety tongs eccentric wheel, clamp elevator rail, prevent elevator to do the hypervelocity motion.Therefore the use of traditional velocity limiter, the top layer machine room of elevator hoistways must leave sufficient space, makes " steel rope ", " tension wheel " make circulating motion.In current machine-roomless lift, can't adopt this traditional velocity limiter again.The patent No. is " 85109248 ", " elevator brake and safety tongs ", and it is that Ka Zha with two fluid controls is installed in car top, and blocks guide rail.According to " the building industry standard JG-1996 of People's Republic of China (PRC) regulation bans use of electricly, and the device of hydraulic pressure or pneumatic actuation comes the manoeuvring safety pincers, so this elevator brake and safety tongs can't be applied.
Summary of the invention
The objective of the invention is to defective and deficiency at above-mentioned prior art, be elevator industry, especially machine-roomless lift designs a kind of speed-limiting safety jaw simple in structure, stable and reliable for performance.Technical scheme of the present invention is achieved in that this elevator speed-limiting safety jaw is to be combined in one by velocity limiter and safety tongs two large divisions, and is installed in the car bottom.Wherein velocity limiter comprises centrifugal wheel, centrifugal, a left side, right side tooth embedding reaches by spring, the transmission device that gear and connecting rod are formed, left side tooth embedding and centrifugal wheel wheel shaft close fit, centrifugal is sleeved in the centrifugal wheel, with left side tooth embedding running-fit, with the centrifugal wheel free-running fit, in centrifugal wheel wheel shaft bottom right side tooth embedding is housed, engage spring is housed below it, plate washer is equipped with in centrifugal bottom, it is a left side, right side tooth embedding is separated mutually, the sleeve that input gear in the transmission device and right side tooth embedding fix is close fit mutually, it can intermesh with the output gear that is contained on the output shaft, connecting rod is housed on output shaft, described safety tongs is by backing block, eccentric wheel, and the transmission device that eccentric wheel is rotated is formed, backing block is by last, following two screw rods are installed on the pincers holder assembly frame, eccentric wheel is contained on the pincers mounting by last, following two screw rods are installed on the chassis sidewall relative with backing block, link to each other with the transmission device of safety tongs by the connecting rod on the velocity limiter output shaft, and power is passed to eccentric wheel on the safety tongs.When the elevator overspeed operation, centrifugal wheel separates with centrifugal, right side tooth embedding is because of elastic force effect and left side tooth embedding engagement, drive input, output gear engagement and output shaft is rotated, the upper and lower motion of drivening rod, the left and right bilateral deflection of eccentric wheel on the control safety tongs is made locking action with backing block to guide rail, reaches the purpose of elevator brake.
The present invention compared with prior art, structure is very simple, saved top layer machine room space, be very suitable for the design of current machine-roomless lift and select for use, next has saved from the room, top to pit back and forth two steel ropes and tension wheel, has reduced productive costs, and installation is oversimplified, concerning the used rope shape velocity limiter of the present invention, saved steel cable and top layer machine room space, it is more flexible than wedge shape velocity limiter that degree of freedom is installed.
Description of drawings
Fig. 1 is the structural representation of the utility model speed-limiting safety jaw.
Fig. 2 is a velocity limiter structural representation among Fig. 1.
Fig. 3 is a rope shaped centrifugal wheel structural representation among Fig. 2.
Fig. 4 is a wedge shape centrifugal wheel structural representation among Fig. 2.
Fig. 5 is the centrifugal wheel assembling scheme drawing of Fig. 3, Fig. 4.
Fig. 6 is the scheme of installation of rope shape velocity limiter.
Fig. 7 is the scheme of installation of wedge shape velocity limiter.
The specific embodiment
By shown in Figure 1, this speed-limiting safety jaw is in aggregates by combination by velocity limiter and safety tongs two large divisions, with being loaded on the car bottom.
By shown in Figure 2, in the housing of velocity limiter, the transmission device that centrifugal wheel 2, centrifugal 3, left and right tooth embedding 4,6 is housed and forms by gear cluster, output shaft 11, output gear 12, connecting rod 13.Left side tooth embedding 4 and centrifugal wheel 2 wheel shaft close fits, centrifugal wheel is cylindrical, and its race rectangular (as shown in Figure 4) is the wedge shape centrifugal wheel, and the velocity limiter of composition claims the wedge shape velocity limiter, and it cooperates with guide rail, is used for obtaining pure rolling friction power from guide rail.Its race semicircular in shape (as shown in Figure 3) is a rope shaped centrifugal wheel, the velocity limiter of the composition shape velocity limiter that claims to restrict, and it cooperates with steel rope, is used for obtaining pure rolling friction power from steel rope.Be contained in for centrifugal 3 in the centrifugal wheel 2, with the centrifugal wheel free-running fit, with left side tooth embedding 4 running-fits.Centrifugal is the semicircle piece of two separation, and it is connected with the wheel shaft elasticity of centrifugal wheel by thru-bolt 25.Centrifugal wheel wheel shaft bottom is set with right side tooth embedding 6, and it is corresponding with left side tooth embedding, and the plate washer 5 that 8, two centrifugal bottoms of engage spring are housed between the axle sleeve inner ring of its top shoulder and wheel shaft bottom separates left and right tooth embedding.The input gear 10 of velocity limiter transmission device be sleeved on right side tooth embedding stationary sleeve 7 on, and close fit with it, it moves and rotates synchronously with right side tooth embedding, when elevator overspeed moves, centrifugal drives plate washer and separates, right side tooth is embedded under the elastic force effect of engage spring 8, meshes with left side tooth embedding.The output gear that is contained in output shaft 11 1 ends is connected with the transmission device of safety tongs by connecting rod 13.
As shown in Figure 7, fixed mandril 26 on the housing of wedge shape velocity limiter, between push rod and velocity limiter chassis compression spring 27 are housed, because elastic force effect, make 28 rotations around the shaft of whole housing, thereby drive wedge shape centrifugal wheel and guide rail engagement, because friction force rotates the wedge shape centrifugal wheel.This wedge shape velocity limiter is loaded on the car bottom.
As shown in Figure 6, to bend wheel parallel to each other 29, make the certain cornerite of formation between steel rope and the centrifugal wheel,, guarantee that centrifugal wheel produces pure rolling to increase friction force in each installation shaft of upper and lower of rope shaped centrifugal wheel.This rope shape velocity limiter is installed on the car bottom.
As shown in Figure 1, be installed in after backing block 19 in the safety tongs and upper and lower two screw rod 21 sockets of belleville spring 20 usefulness on one side of pincers holder assembly frame 24, eccentric wheel is contained in the another side of pincers holder assembly frame, and the spatial separation between them is the installation site of hoistway guide rail.Being equipped with on the pincers holder assembly of eccentric wheel 18, backing block 19 has two through holes, by this through hole it is installed on the punching axle 22 of casing, sliding joining.End at pincers holder assembly 24 is equipped with fixing screw 23, and the other end that is set a spring 17 on punching axle 22 makes adjust the clearance that backing block 19, eccentric wheel 2 and guide rail match to desirable position.One end of upper and lower two push rods 16 is rotaryed connection with the upper and lower disc of eccentric wheel, behind the cover upper spring, its other end is connected with upper and lower two ends of pivoted arm 14, form four-bar linkage, rotating shaft 15 of the center fixation of pivoted arm, rotating shaft is rotated, and drives pivoted arm and turns left and right, and makes that eccentric wheel is suitable, conter clockwise deflection.Rotating shaft 15 and the connecting rod on the velocity limiter output shaft 13 on the safety tongs flexibly connect.
During the upper and lower operation of elevator, centrifugal wheel (wedge shape or rope shape) is made cw thereupon or is rotated counterclockwise.When elevator overspeed moves, the rotation of centrifugal wheel hypervelocity, centrifugal is disconnected from each other because of action of centrifugal force, and baffle plate also separates thereupon, under the effect of engage spring, makes the engagement of right side tooth embedding upward movement and left side abaculus, and rotation together.Meanwhile, input gear upwards meshes with output gear, and rotate together, the drive output shaft rotates, thereby make the upper and lower motion of connecting rod, the rotating shaft that connecting rod drives on the safety tongs is rotated, and pivoted arm is rotated to the left or to the right, spur upper and lower push rod make eccentric wheel just, conter clockwise deflection, jointly guide rail is clamped with backing block.
Electromagnetism Bringing-back mechanism 9 open in usual is housed on this speed-limiting safety jaw, and under the energising situation, the electromagnet action throws off left and right tooth embedding by magnetic clutch, and eccentric wheel automatically resets under the effect of spring.