CN211687842U - Braking device - Google Patents

Abstract

The utility model relates to a braking device, including the safety tongs, establish the first support on the safety tongs, rotate the cross axle of being connected with first support, establish the swing arm that has operation end and control end on the cross axle, fix on the first support and be located the first spacing on the removal orbit of control end, articulate the second on first support spacing, the cover is used for promoting the control end to keeping away from first spacing direction pivoted torsional spring on the cross axle, slider with the pincers body sliding connection of safety tongs, both ends are connected with the operation end of slider and swing arm respectively the pull rod with establish the pulling device on the safety tongs, an electro-magnet and both ends that are used for with the spacing motion orbit of follow control end of second push away from are respectively with the first support and the spacing flexible portion etc. that are used for the spacing direction removal that is close to the swing arm of pulling second of being connected of second. The utility model is used for emergency braking of elevator car and lift garage etc. has characteristics such as simple structure and reaction rate are fast.

Description

Braking device

Technical Field

The utility model belongs to the technical field of the technique of stall braking and specifically relates to a braking device is related to.

Background

Safety tongs are the safety arrangement of elevator. The elevator safety gear device is a safety device which emergently stops a car and clamps the car on a guide rail under the operation of a speed limiter when the speed of an elevator exceeds the set limit speed of the speed limiter of the elevator or in the case of breakage and looseness of a suspension rope.

The existing safety tongs mostly adopt a mechanical linkage type control mode, have a complex structure, are limited by a long transmission path, and have certain delay in starting time.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a not enough to prior art exists, the utility model aims at providing a brake equipment, this brake equipment can carry out the quick braking.

The above object of the present invention can be achieved by the following technical solutions:

a brake apparatus comprising:

the safety gear is provided with a first bracket;

the transverse shaft is arranged on the first bracket;

the swing arm is arranged on the transverse shaft and is provided with an operation end and a control end;

the first limit is fixed on the first support and is positioned on the moving track of the control end;

the second limit is hinged on the first support and limits the swing range of the control end together with the first limit;

the torsional spring is sleeved on the transverse shaft, and two ends of the torsional spring are respectively fixed on the transverse shaft and the first bracket and are used for pushing the control end to rotate towards the direction far away from the first limit;

the electromagnet is arranged on the first support and used for pushing the second limit away from the motion track of the control end;

the sliding block is connected with the clamp body of the safety clamp in a sliding manner;

two ends of the pull rod are respectively connected with the slide block and the operation end of the swing arm;

the pulling device is arranged on the safety gear and used for pulling the swing arm to enable the control end to move towards the direction close to the first limit position; and

and two ends of the telescopic part are respectively connected with the first support and the second limit and used for pulling the second limit back to the motion trail of the control end.

Through adopting above-mentioned technical scheme, when braking, the electro-magnet moves rapidly, pushes away the second is spacing, and the control end of swing arm begins to rotate, and the slider on the pulling pincers body slides through the pull rod pulling. The moving directions of the sliding block and the safety tongs are opposite, in the process of relative sliding of the sliding block and the safety tongs, the clearance between the sliding block and the guide rail is gradually reduced to be close to the guide rail surface, the pressure borne by the sliding block is rapidly increased, the friction force between the sliding block and the rail is increased, and rapid braking is realized. The action of the sliding block is directly triggered by the electromagnet, and compared with a mechanical control mode, the control stroke triggered by the electromagnet is shorter, and the reaction is quicker.

The utility model discloses further set up to: in the direction perpendicular to the axis of the transverse shaft, the cross section of the transverse shaft is polygonal;

a polygonal hole matched with the transverse shaft is formed in the swing arm;

the swing arm is sleeved on the cross shaft through a polygonal hole.

Through adopting above-mentioned technical scheme, the swing arm cover can rotate along with it after polygonal cross axle, and the structure is simpler, and the connection between the two is also more firm.

The utility model discloses further set up to: a plurality of jacks are arranged on the first support;

one end of the torsion spring is positioned in one of the insertion holes.

Through adopting above-mentioned technical scheme, insert the one end of torsional spring in the different jacks, can adjust the torsional spring to the moment of force that the cross axle was exerted, can adjust the torsional spring according to actual conditions like this, the actual user demand of laminating more.

The utility model discloses further set up to: and a brake shoe is arranged on one side of the sliding block close to the track.

Through adopting above-mentioned technical scheme, can increase the frictional force between slider and the track, improve braking effect.

The utility model discloses further set up to: and a clamping groove matched with the second limit is arranged on the control end of the swing arm.

Through adopting above-mentioned technical scheme, can increase the area of contact between swing arm and the second is spacing, reduce the probability that skids and improve the stability of the two when the contact.

The utility model discloses further set up to: the pulling device comprises a second bracket arranged on the safety gear, a driving part arranged on the second bracket, a rotating wheel arranged on a rotating shaft of the driving part and a pull rope;

one end of the pull rope is fixed on the rotating wheel, and the other end of the pull rope is fixed on the swing arm, so that the control end of the swing arm rotates towards the direction close to the first limit position.

Through adopting above-mentioned technical scheme, when the drive division rotated, through runner pulling stay cord, made the operating end swing of swing arm to make the slider break away from the track. The pulling device has simple structure and light weight, and can be installed in a small space.

The utility model discloses further set up to: the driving part comprises a speed reducer arranged on the second support and a motor arranged on the speed reducer;

the rotating wheel is arranged on a rotating shaft of the speed reducer.

By adopting the technical scheme, the motor and the speed reducer are taken as a mature scheme, the running is stable, and the damage is not easy to damage.

The utility model discloses further set up to: the first travel switch is arranged on the first support;

the detection end of the first travel switch is positioned on the moving track of the control end and used for giving out signals to stop the driving part from rotating.

By adopting the technical scheme, the driving part can be rapidly stopped after finishing the action, and the damage caused by long-time starting is avoided.

The utility model discloses further set up to: a transition piece is arranged on the swing arm;

the transition piece comprises a first part and a second part arranged on the first part, and the second part inclines towards the direction far away from the detection end of the first travel switch;

the detection end of the first travel switch is positioned on the moving track of the second part.

Through adopting above-mentioned technical scheme, the swing arm is when rotating, and the second part on the transition piece lies in the in-process of first travel switch detection end contact, and contact strength increases gradually, and impact strength when can reducing direct contact prolongs first travel switch's life.

The utility model discloses further set up to: the travel control device also comprises a second travel switch arranged on the second bracket and a travel control block arranged on the rotating wheel;

the detection end of the second travel switch is positioned on the moving track of the travel control block and used for giving a signal to stop the rotation of the driving part.

By adopting the technical scheme, the driving part can be rapidly stopped after finishing the action, the pull rope can be loosened but not excessively loosened, the pull rope can be rapidly tightened when braking next time, and the reaction time of corresponding steps is shortened.

To sum up, the utility model discloses a beneficial technological effect does:

1. when braking is carried out, the electromagnet rapidly acts to push the second limit away, the control end of the swing arm starts to rotate, the slide block on the clamp body is pulled to slide through the pull rod, the moving direction of the slide block is opposite to that of the safety clamp, in the process of relative sliding of the slide block and the safety clamp, the gap between the slide block and the guide rail is gradually reduced to be close to the guide rail surface, the pressure borne by the slide block is rapidly increased, the friction force between the slide block and the rail is increased accordingly, and rapid braking is realized. The action of the sliding block is directly triggered by the electromagnet, and compared with a mechanical control mode, the control stroke triggered by the electromagnet is shorter, and the reaction is quicker.

2. The first travel switch can make the driving part stop quickly after finishing the action, and avoid being burnt out due to long-time starting but no rotation.

3. The second travel switch can make the driving part stop quickly after finishing the action, so that the pull rope can be loosened but not excessively loosened, the pull rope can be tightened quickly during the next braking, and the reaction time of the corresponding step is shortened.

4. When the swing arm rotates, the second part on the transition piece is in the process of contacting with the detection end of the first travel switch, the contact strength is gradually increased, the impact strength during direct contact can be reduced, and the service life of the first travel switch is prolonged.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention.

Fig. 2 is a schematic perspective view based on fig. 1, in which the viewing angle is switched.

Fig. 3 is a schematic view of the structure of the swing arm and the connection thereof based on fig. 1, wherein a part of the first bracket and the transverse shaft are hidden.

Fig. 4 is a schematic diagram of an electromagnet according to an embodiment of the present invention.

Fig. 5 is an enlarged schematic view of a portion a in fig. 2.

Fig. 6 is a schematic view illustrating a connection between a torsion spring and a first bracket and a cross shaft according to an embodiment of the present invention.

Fig. 7 is an installation schematic diagram of a first travel switch according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a driving portion according to an embodiment of the present invention.

Fig. 9 is an installation schematic diagram of a second travel switch according to an embodiment of the present invention.

In the figure, 11, safety tongs, 12, a transverse shaft, 13, a swing arm, 14, a first limit, 15, a second limit, 16, a torsion spring, 17, an electromagnet, 18, a sliding block, 181, a brake shoe, 19, a pull rod, 20, a pulling device, 21, a first travel switch, 22, a transition piece, 23, a second travel switch, 24, a travel control block, 31, a telescopic part, 111, a first bracket, 112, a jack, 113, a main body part, 114, a caliper block, 115, a rocker arm, 116, an elastic element, 133, a polygonal hole, 131, an operation end, 132, a control end, 134, a clamping groove, 171, a shell, 172, an iron core, 173, a coil, 174, a return spring, 201, a second bracket, 202, a driving part, 203, a rotating wheel, 204, a pull rope, 221, a first part, 222, a second part, 2021, a speed reducer, 2022 and a motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, a brake device disclosed for an embodiment of the present invention mainly comprises a safety gear 11 and a brake part.

The safety gear 11 is mainly composed of a main body 113, a gear block 114 slidably connected to the main body 113, a swing arm 115 rotatably connected to the main body 113, and an elastic member 116.

The braking part mainly comprises a first bracket 111, a transverse shaft 12, a swing arm 13, a first limit 14, a second limit 15, a torsion spring 16, an electromagnet 17, a sliding block 18, a pull rod 19, a pulling device 20 and the like, wherein the first bracket 111 is fixedly arranged on the safety gear 11, and the connection mode between the first bracket 111 and the safety gear 11 can be welding or bolt connection.

The transverse shaft 12 is rotatably connected to the first bracket 111, and both ends of the transverse shaft respectively penetrate through holes on the first bracket 111. The torsion spring 16 is sleeved on the cross shaft 12, one end of the torsion spring 16 is fixed on the first bracket 111, the other end of the torsion spring 16 is fixed on the cross shaft 12, after the cross shaft 12 rotates under the action of external force, the torsion spring 16 stores the force, and after the external force disappears, the torsion spring 16 can apply a torque to the cross shaft 12 to drive the swing arm 13 to rotate.

Of course, both ends of the transverse shaft 12 may be fixed to the first bracket 111, at this time, the swing arm 13 is rotatably connected to the transverse shaft 12, the torsion spring 16 is still sleeved on the transverse shaft 12, and both ends thereof are respectively connected to the transverse shaft 12 and the swing arm 13, so that the swing arm 13 is still rotated without changing the function.

Referring to fig. 1 and 3, the swing arm 13 is fixedly mounted on the transverse shaft 12 and can swing along with the rotation of the transverse shaft 12, and for convenience of description, two ends of the swing arm are named as an operation end 131 and a control end 132 respectively.

The operating end 131 of the swing arm 13 is connected with a pull rod 19, the other end of the pull rod 19 is connected with a slide block 18, the slide block 18 is connected with a clamp block 114 of the safety gear 11 in a sliding mode, and the swing arm 13 can pull the slide block 18 to slide on the clamp block 114 in the swinging process.

The connecting mode of the pull rod 19 and the swing arm 13 has multiple modes, the first mode is hinged, the second mode is that a hole is added on the swing arm 13, two groups of nuts are added on the pull rod 19, one end of the pull rod 19 penetrates through the hole on the swing arm 13, the two groups of nuts on the pull rod 19 are respectively positioned on two sides of the hole, the pull rod 19 is hung on the swing arm 13, and the hole on the swing arm 13 is larger than the diameter of the pull rod 19, so that the pull rod 19 can freely swing relative to the swing arm 13.

The first limit 14 and the second limit 15 are both mounted on the first bracket 111, wherein the first limit 14 is fixed on the bracket 111, and the second limit 15 is hinged on the first bracket 111. The two limit positions are located on the moving track of the control end 132, and can limit the movement of the control end 132 to enable the control end to swing within a certain range.

Referring to fig. 1 and 4, the electromagnet 17 is mainly composed of a housing 171, an iron core 172 slidably connected to the housing 171, a coil 173 installed in the housing 171, a return spring 174, and the like, and when a current is applied, the coil 173 generates a magnetic field to slide the iron core 172 to extend from the housing 171, and when a current is not applied, the magnetic field disappears and the return spring 174 pushes the iron core 172 back to the original position.

The electromagnet 17 is mounted on the first bracket 111 and is used for pushing the second limit 15 away from the moving track of the control end 132, so that the control end 132 of the swing arm 13 can continuously swing.

Referring to fig. 3, after the second limit 15 is pushed away from the moving track of the control end 132 by the electromagnet 17, a reset operation is required, so that an extensible part 31 is added, and two ends of the extensible part 31 are respectively connected with the first bracket 111 and the second limit 15. When the electromagnet 17 is operated, the telescopic part 31 is extended along with the swing of the second limit 15, and when the iron core 172 of the electromagnet 17 is retracted, the telescopic part 31 is shortened, and the second limit 15 is pulled back to the original position.

Preferably, the telescopic portion 31 is a spring, and both ends of the spring are respectively hung on the first bracket 111 and the second limit 15.

The pulling device 20 is mounted on the safety gear 13 and is operative to pull the swing arm 13 to rotate so that the control end 132 thereof moves in a direction approaching the first limit 14.

The braking device is mounted on the car or garage of the elevator, the guide rails of the elevator or garage pass through the main body part 113 of the safety gear 11, the two clamp blocks 114 are respectively positioned on two sides of the rail, and similarly, the sliding blocks 18 are also positioned on two sides of the rail.

If the car or the lift garage of elevator rises or after the in-process that descends if the stall appears, the control system in elevator or lift garage detects this signal, begins to carry out emergency braking operation, and specific process is:

the electromagnet 17 starts to operate after receiving the signal, and pushes the second limit 15 to move in a direction away from the control end 132 of the swing arm 13. After the second limit 15 is out of contact with the control end 132 of the swing arm 13, the torsion spring 16 starts to push the cross shaft 12 to rotate, and the cross shaft 12 rotates and simultaneously drives the control end 132 of the swing arm 13 to rotate in a direction away from the first limit 14.

The operating end 131 of the swing arm 13 pulls the slide block 18 to slide in the block 114 of the safety gear 11 through the pull rod 19. During a stall, the safety gear 11 is driven by the car or the lifting garage to slide downwards, the sliding block 18 slides downwards together with the safety gear, but the sliding block 18 slides upwards under the pulling of the pull rod 19 by taking the clamp block 114 as a reference, and the moving direction of the clamp block 114 is opposite. The clearance between the slide block 18 and the guide rail is gradually reduced, when the slide block 18 is in contact with the rail, the slide block 18 continuously slides upwards relative to the clamp block 114 to clamp the guide rail to be tightly attached to the surface of the rail, and along with the relative movement of the slide block 18 and the guide rail, the slide block 18 pushes the clamp block 114 to drive the swing arm 115 to swing and compress the elastic element 116 until the slide block 18 moves to the top impacting position of the safety clamp, the elastic element 116 provides stable positive pressure for the slide block 18 after being compressed, so that stable friction opposite to the moving direction of the elevator car or the lifting garage is generated between the slide block 18 and the guide rail, the elevator car or the lifting garage can be gradually decelerated to a braking state, and emergency braking under a stalling state is realized.

After braking is completed, the clamp block 114 presses the slide block 18 tightly on the guide rail, and at this time, the car or the lifting garage of the elevator needs to ascend for a certain distance before resuming running, and at this time, the clamp block 114 and the slide block 18 ascend simultaneously, but the ascending speed of the slide block 18 is slower than that of the clamp block 114, and the pressure between the two is reduced.

After the swing arm is lifted for a certain distance (about 0.3-0.5 m), the pulling device 20 starts to pull the swing arm 13 to rotate, and at this time, the control end 132 of the swing arm 13 starts to move towards the direction close to the first limit 14 and stops after contacting the first limit 14. When the control end 132 of the swing arm 13 moves, its operating end 131 simultaneously rotates in the opposite direction and pushes the slide block 18 to slide on the block 114 of the safety gear 11 via the pull rod 19. In this process the distance between the slide 18 and the rail increases and the car or garage of the elevator can freely rise and fall on the rail.

The control end 132 of the swing arm 13 will pull the second limit stop 15 back into position while moving closer to the first limit stop 14, at the same time as the telescopic portion 31 will pull the second limit stop 15 back into position. After the pulling device 20 stops, the control end 132 of the swing arm 13 again rides on the second stop 15.

In order to increase the friction force when the sliding block 18 contacts with the track, a brake rubber 181 is additionally arranged on the sliding block 18, and the brake rubber 181 is fixed on the sliding block 18 by bolts. The brake shoe 181 is made of alloy structural steel which is subjected to heat treatment and surface knurling treatment, and kinetic energy can be rapidly converted into heat energy in the process of contacting with a rail, so that the falling speed of the car or the lifting garage is reduced.

Referring to fig. 2 and 5, the control end of the swing arm 13 is directly lapped on the second limit 15, and the two limit ends are in line contact or single surface contact, which has more freedom and is easy to shake, so that a slot 134 is added on the control end 132 of the swing arm 13, the shape of the slot 134 is matched with that of the second limit 15, and the inner side surface of the slot is a curved surface or consists of a plurality of planes. Therefore, the contact area between the control end 132 of the swing arm 13 and the second limit 15 can be increased, the degree of freedom of the joint can be reduced, and the stability during contact can be further improved.

Referring to fig. 1 and 3, the transverse shaft 12 is rotatably connected to the first bracket 111 in the following ways:

the first is to directly form a circular hole on the first bracket 111, two ends of the cross shaft 12 directly extend out of the circular hole, and the cross shaft 12 is provided with a shaft stop, a retainer ring, a pin shaft, a nut or a bolt, etc., so that the relative position of the cross shaft 12 and the first bracket 111 is fixed, and the axial movement of the cross shaft 12 is avoided. In this embodiment, the cross-sectional shape of the transverse shaft 12 may be circular or polygonal.

The second method is to mount the bearing seat on the first bracket 111 and then mount the cross shaft 12 on the bearing seat, and at this time, a shaft stop or a nut needs to be mounted on the cross shaft 12 to avoid axial movement of the cross shaft 12. In this embodiment, the cross-sectional shape of the transverse shaft 12 may be circular.

The swing arm 13 is mounted on the cross shaft 12, the connection mode between the two can be various forms such as welding, key connection or direct fixation by bolts, and when the key connection is used, the two are fixed together by bolts at the same time, so that the swing arm 13 is prevented from sliding on the cross shaft 12.

Preferably, the cross-sectional shape of the cross shaft 12 is polygonal, and may be rectangular or regular hexagonal, so that the cross shaft 12 may be made of a square tube or a hexagonal tube, and accordingly, the swing arm 13 needs to be provided with a polygonal hole 133 matching the cross-sectional shape of the cross shaft 12. The swing arm 13 is sleeved on the transverse shaft 12 and then connected together by bolts, so that the swing arm 13 is prevented from sliding on the transverse shaft 12.

When the swing arm 13 is rotatably connected to the transverse shaft 12, the cross-sectional shape of the transverse shaft 12 is circular. The transverse shaft 12 passes directly through a hole in the swing arm 13 or a bearing is additionally arranged at the joint of the two.

Further, the bearing at the joint of the transverse shaft 12 and the swing arm 13 is a sliding bearing.

The torsion spring 16 is a kind of spring, and two ends of the torsion spring are respectively provided with a hook, and the torsion spring can be abutted against or hung on two objects, and can be deformed and accumulate force when being subjected to external force, and can be restored to the original shape when the external force disappears.

Referring to fig. 2 and 6, the number of the torsion springs 16 is two, and the torsion springs are respectively sleeved on two ends of the transverse shaft 12, and two hooks at two ends of the torsion springs are respectively hooked on the transverse shaft 12 and the first bracket 111. When the swing arm is static, the torsion spring 16 applies a torque to the cross shaft 12, so that the control end 132 of the swing arm 13 presses on the second limit 15; when braking, the electromagnet 17 pushes away the second limit 15, the limit on the control end 132 of the swing arm 13 disappears, the torsion spring 16 starts to push the swing arm 13 to rotate, and when the swing arm 13 rotates, the slide block 18 is pulled by the pull rod 19 to move in the direction opposite to the moving direction of the safety gear 11, so that the safety gear is attached to the guide rail to realize emergency braking; when the device is reset, the pulling device 20 pulls the swing arm 13 to rotate, meanwhile, the telescopic part 31 pulls the second limit 15 back to the original position, and after the pulling device 20 stops, the torsion spring 16 drives the swing arm 13 to rotate reversely through the transverse shaft 12, so that the control end 132 of the torsion spring is lapped on the second limit 15.

In the actual manufacturing and using process, the torque applied by the torsion spring 16 to the transverse shaft 12 is different due to the difference of the batch and the using time of the torsion spring 16, and for the convenience of adjustment, a plurality of insertion holes 112 are formed in the first bracket 111, and one hook of the torsion spring 16 can be inserted into different insertion holes 112, so as to adjust the prestress on the torsion spring 16.

Further, a plurality of insertion holes 112 are provided in the first bracket 111 with reference to the axis of the transverse shaft 12, and the angles between adjacent insertion holes 112 are equal.

Referring to fig. 1 and 2, after the swing arm 13 is pulled by the pulling device 20 to rotate until the control end 132 of the swing arm is in contact with the first limit 14, the swing arm 13 cannot continue to rotate, at this time, the pulling device 20 cannot output power, electric energy is converted into heat energy, heat accumulation occurs inside the pulling device 20, the service life of the pulling device 20 can be shortened, and the pulling device 20 can be directly burnt out in severe cases. To avoid this, a first travel switch 21 is mounted on the first bracket 111, and the detection end of the first travel switch 21 is located on the moving track of the control end 132 of the swing arm 13, and when the control end 132 of the swing arm 13 passes the detection end of the first travel switch 21, the first travel switch 21 can give a signal, and the control system of the elevator or the elevator garage powers off the pulling device 20.

The first position switch 21 may be a contact type or a non-contact type.

The contact type working principle is as follows: when a module installed on a production mechanical moving part impacts a travel switch, a contact of the travel switch acts to realize circuit switching, and the operation is similar to that of a button, namely, after a control end 132 of the swing arm 13 is contacted with a detection end of the first travel switch 21, the detection end acts, the first travel switch 21 sends an electric signal, and a control system of an elevator or a lifting garage carries out corresponding action after receiving the electric signal.

The non-contact working principle is as follows: the detection end of the travel switch generates a stable field, such as a magnetic field, when a mechanical moving part passes through the field, the field changes, and a change signal is detected and then fed back to a control system of the elevator or the lifting garage; or the detection end of the travel switch sends out detection light, and when the feedback is detected or cannot be detected, the situation that a mechanical moving part passes through is indicated, and then the detection light is fed back to the control system of the elevator or the lifting garage.

Preferably, the first travel switch 21 is a contact travel switch.

Referring to fig. 7, further, a transition piece 22 is added to the swing arm 13, and the transition piece 22 is composed of a first portion 221 fixed to the swing arm 13 and a second portion 222 fixed to the first portion 221. The second portion 222 is inclined in a direction away from the detection end of the first travel switch 21, so that the second portion 222 and the detection end surface of the first travel switch 21 are inclined, the impact strength when the second portion 222 and the first travel switch are in contact can be reduced, and the service life of the first travel switch 21 is prolonged.

Referring to fig. 8, the pulling device 20 mainly comprises a second bracket 201, a driving portion 202, a rotating wheel 203, a pulling rope 204 and the like, wherein the second bracket 201 is welded or bolted to the safety gear 11, the driving portion 202 is fixedly installed on the second bracket 201, the rotating wheel 203 is installed on a rotating shaft of the driving portion 202, one end of the pulling rope 204 is fixed on the rotating wheel 203, a part of the pulling rope is wound on the rotating wheel 203, and the other end of the pulling rope is fixed on the swinging arm 13.

When the driving part 202 works, the rotating wheel 203 is driven to rotate, and when the rotating wheel 203 rotates, the length of the pull rope 204 wound on the rotating wheel 203 is increased, so that the swing arm 23 is pulled to rotate. The driving portion 202 is used to rotate the control end 132 of the swing arm 23 in a direction approaching the first limit 14, so that the operating end 131 of the swing arm 23 pushes the slide block 18 to move through the pull rod 19, and the distance between the slide block 18 and the guide rail is increased.

After the first stroke switch 21 is operated, the driving portion 202 drives the rotating wheel 203 to rotate reversely, so that the pull rope 204 is changed from a tight state to a loose state.

Referring to fig. 9, the driving portion 202 is mainly composed of a speed reducer 2021 flanged to the second bracket 201 and a motor 2022 mounted on the speed reducer 2021, and the rotating wheel 203 is keyed on a rotating shaft of the speed reducer 2021.

When the pulley 203 rotates in the reverse direction, the length of the rope 204 wound thereon decreases, and the swing of the swing arm 13 at the next emergency braking is left. For example, the swing amount required for the swing arm 13 is S, the swing amount reserved for the swing of the swing arm 13 by the pull rope 204 in the relaxed state needs to be KS, where K is a safety factor, and its value is greater than 1.

In order to control the swing amount of the swing arm 13 reserved by the pull rope 204 in the relaxed state within a reasonable range, a second travel switch 23 is mounted on the second bracket 201, a travel control block 24 is mounted on the rotating wheel 203, and the type and the function of the second travel switch 23 are the same as those of the first travel switch 21, which is not described again here.

The sensing end of the second travel switch 23 is located on the path of travel of the travel control block 24 so that when the travel control block 24 rotates with the wheel 203 to contact or enter the sensing area of the sensing end of the second travel switch 23, the second travel switch 23 can send a signal to the elevator or garage elevator control system to stop the reverse rotation of the drive section 202. Therefore, the looseness of the pull rope 204 can be controlled by controlling the working time of the driving part 202, so that the swinging requirement of the swing arm 13 can be met, excessive looseness can not be generated, the working time of the driving part 202 is increased, and meanwhile, the loose pull rope 204 can be prevented from being wound together.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. A brake apparatus, comprising:

the safety gear (11) is provided with a first bracket (111);

a cross shaft (12) arranged on the first bracket (111);

a swing arm (13) provided on the lateral shaft (12) and having an operation end (131) and a control end (132);

the first limit (14) is fixed on the first bracket (111) and is positioned on the moving track of the control end (132);

the second limit (15) is hinged on the first bracket (111) and limits the swing range of the control end (132) together with the first limit (14);

the torsion spring (16) is sleeved on the transverse shaft (12), two ends of the torsion spring are respectively fixed on the transverse shaft (12) and the first bracket (111), and the torsion spring is used for pushing the control end (132) to rotate towards the direction far away from the first limit (14);

the electromagnet (17) is arranged on the first bracket (111) and used for pushing the second limit (15) away from the motion track of the control end (132);

the sliding block (18) is connected with the clamp body of the safety clamp (11) in a sliding way;

the two ends of the pull rod (19) are respectively connected with the slide block (18) and the operation end (131) of the swing arm (13);

the pulling device (20) is arranged on the safety gear (11) and used for pulling the swing arm (13) to enable the control end (132) to move towards the direction close to the first limit position (14); and

and two ends of the telescopic part (31) are respectively connected with the first bracket (111) and the second limit (15) and used for pulling the second limit (15) back to the motion track of the control end (132).

2. A braking apparatus according to claim 1, characterized in that: the cross section of the transverse shaft (12) is polygonal in the direction perpendicular to the axis of the transverse shaft (12);

a polygonal hole (133) matched with the transverse shaft (12) is formed in the swing arm (13);

the swing arm (13) is sleeved on the transverse shaft (12) through a polygonal hole (133).

3. A braking apparatus according to claim 1, characterized in that: a plurality of jacks (112) are arranged on the first bracket (111);

one end of the torsion spring (16) is positioned in one of the jacks (112).

4. A braking apparatus according to claim 1, characterized in that: and a brake shoe (181) is arranged on one side of the sliding block (18) close to the track.

5. A braking apparatus according to claim 1, characterized in that: and a clamping groove (134) matched with the second limiting part (15) is arranged on the control end (132) of the swing arm (13).

6. A braking apparatus according to claim 1, characterized in that: the pulling device (20) comprises a second bracket (201) arranged on the safety gear (11), a driving part (202) arranged on the second bracket (201), a rotating wheel (203) arranged on a rotating shaft of the driving part (202) and a pull rope (204);

one end of the pull rope (204) is fixed on the rotating wheel (203), and the other end of the pull rope is fixed on the swing arm (13), so that the control end (132) of the swing arm (13) rotates towards the direction close to the first limit (14).

7. A braking apparatus in accordance with claim 6, characterised in that: the driving part (202) comprises a speed reducer (2021) arranged on the second bracket (201) and a motor (2022) arranged on the speed reducer (2021);

the rotating wheel (203) is arranged on a rotating shaft of the speed reducer (2021).

8. A braking apparatus in accordance with claim 6, characterised in that: the first travel switch (21) is arranged on the first bracket (111);

the detection end of the first travel switch (21) is positioned on the moving track of the control end (132) and is used for giving a signal to stop the rotation of the driving part (202).

9. A braking apparatus in accordance with claim 7, characterised in that: a transition piece (22) is arranged on the swing arm (13);

the transition piece (22) comprises a first part (221) and a second part (222) arranged on the first part (221), and the second part (222) is inclined to the direction far away from the detection end of the first travel switch (21);

the detection end of the first travel switch (21) is positioned on the moving track of the second part (222).

10. A braking apparatus according to claim 6 or 8, characterised in that: the device also comprises a second travel switch (23) arranged on the second bracket (201) and a travel control block (24) arranged on the rotating wheel (203);

the detection end of the second travel switch (23) is positioned on the moving track of the travel control block (24) and is used for giving a signal to stop the rotation of the driving part (202).

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