CN116924178A - Speed limiting braking device - Google Patents
Speed limiting braking device Download PDFInfo
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- CN116924178A CN116924178A CN202311183406.3A CN202311183406A CN116924178A CN 116924178 A CN116924178 A CN 116924178A CN 202311183406 A CN202311183406 A CN 202311183406A CN 116924178 A CN116924178 A CN 116924178A
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- transmission shaft
- rotating disc
- speed limiting
- friction
- shell
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 54
- 230000005540 biological transmission Effects 0.000 claims abstract description 80
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 14
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 16
- 238000005096 rolling process Methods 0.000 description 9
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002783 friction material Substances 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Abstract
The invention relates to a speed limiting braking device which comprises a speed limiting box and two racks, wherein the speed limiting box comprises a shell, a transmission shaft and a friction mechanism, two ends of the transmission shaft respectively penetrate through the shell and extend out of the shell, gears meshed with the two racks are respectively arranged between the transmission shaft and the shell, the friction mechanism comprises a rotating disc, a first friction ring and a second friction ring, the rotating disc is connected to the transmission shaft and rotates along with the transmission shaft, the first friction rings are connected to two side surfaces of the rotating disc, the second friction rings are arranged on the inner walls of the shells on two sides of the rotating disc, and when the rotating speed of the transmission shaft reaches a certain degree, any one of the first friction rings contacts with the corresponding second friction ring and limits the rotation of the transmission shaft. The invention is a speed limiting braking device which has simple structure and convenient installation, and can be installed and used without changing the structures of the existing lifting device and an outer frame.
Description
Technical Field
The invention relates to the technical field of safety devices, in particular to a speed limiting braking device.
Background
Because of the high equipment, the chemical fertilizer plant or other coal chemical industry needs to convey raw materials up and down frequently, a man-carrying or cargo lifting device, such as a vertical loading hopper, is usually installed beside the equipment, and is provided with a man-carrying or cargo carrying space in a bucket or cage type, and can move up and down along a fixed channel under the pulling of a traction rope, because of the large loading capacity and the heavy weight of the dead weight plus the weight of the internal man or raw materials, the phenomenon of quick falling or quick top-punching caused by the stalling of a motor can occur in the running process due to the breakage of the traction rope, and once such an accident occurs, the equipment is damaged lightly, and the physical health of operators in a workshop is endangered by the heavy weight, so that a speed limiting device is generally additionally installed on the lifting device.
In the prior art, a plurality of structures related to speed limiting devices are arranged, but weak current control is mostly used, such equipment is outdoor in actual production, the environment is bad, the measurement accuracy of a detection device is greatly influenced, a speed reducing mechanism needs control electronics of a central console to conduct instruction control, the control device is not sensitive enough in response when being used, and the safety is poor, so that the speed limiting of a lifting device is not perfect.
Therefore, a speed limiting brake device which is reasonable in structure and high in safety and is suitable for industrial use is needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a speed limiting braking device, and aims to provide a speed limiting braking device which is reasonable in structure, high in safety and suitable for industrial use.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a speed limiting braking device comprises a speed limiting box and two racks;
the speed limiting box comprises a shell, a transmission shaft and a friction mechanism, wherein the transmission shaft is coaxial with the shell, two ends of the transmission shaft respectively penetrate through the shell and extend out of the shell, gears respectively meshed with two racks are arranged at two ends of the transmission shaft, and the friction mechanism is arranged between the transmission shaft and the shell;
the friction mechanism comprises a rotating disc, first friction rings and second friction rings, wherein the rotating disc is connected to a transmission shaft, a sliding trend along the transmission shaft is generated when the rotating disc rotates along with the transmission shaft, first elastic pieces are arranged on two sides of the rotating disc, the first friction rings are connected to two sides of the rotating disc, second friction rings are arranged on inner walls of shells on two sides of the rotating disc, the second friction rings are in a sliding state along the length direction of the shell, second elastic pieces are arranged between the two second friction rings and inner end faces of the shell, which are close to each other, and when the rotation speed of the transmission shaft reaches a certain degree, any one of the first friction rings is in contact with the corresponding second friction ring and limits the rotation of the transmission shaft.
When the speed limiting box is used, the rack is fixed, the transmission shaft is meshed with the rack through the gear to generate rotary power, the rotary speed of the transmission shaft is in direct proportion to the running speed of the lifting device where the speed limiting box is located, after the rotary speed of the transmission shaft reaches a certain degree, the first friction ring and the second friction ring on the rotary disc are contacted to generate friction force, and the friction force is fed back to the transmission shaft through the rotary disc to reduce the speed of the transmission shaft.
Further, be equipped with the guide way on the transmission shaft, the rolling disc cover is on the transmission shaft, and the rolling disc center is equipped with the shaft hole, be equipped with the guide block that stretches into the guide way on the shaft hole inner wall, the last ventilation hole of array of rolling disc and inclined blade form the effect of blowing when the rolling disc is rotatory.
Because the rotating disc rotates along with the transmission shaft, the ventilation holes and the inclined blades can form wind, the reaction force of the air can enable the rotating disc to move to a certain side, the specific moving direction depends on the deflection direction of the blades, when the rotating disc moves, according to the distance that the rotating disc moves against the elastic force of the first spring, the first friction ring cannot be in contact with the second friction ring within a certain rotating speed range, the speed of the transmission shaft is not limited, and when the rotating speed of the transmission shaft is increased, the distance that the rotating disc moves against the elastic force of the first spring is increased, so that any one first friction ring can be in contact with the corresponding second friction ring and the rotation of the transmission shaft is limited.
There are many ways of driving the rotating disc to move, for example, a coil is arranged on the rotating disc, a magnet is arranged in the shell, when the coil rotates along with the rotating disc, current is generated by cutting a magnetic induction line, meanwhile, a magnetic field formed by the current interacts with a magnetic field formed by the magnet to enable the rotating disc to move, and along with the increase of the rotating speed, the moving effect is better, but the effect is more stable and more convenient to use than that of arranging a vent hole and an inclined blade on the rotating disc.
Further, the guide groove is formed by two spiral sections and a straight section, two ends of the straight section are respectively communicated with one spiral section, the rotation direction, the screw pitch and the total length of the two spiral sections are the same, and when the second elastic piece is in a natural state, each second friction ring corresponds to the middle position of one spiral section respectively.
When the straight section of guide slot and the cooperation of first elastic component make the transmission shaft in certain rotational speed scope, the rotating disk can not remove the spiral section, and the rotating disk just can not carry out the speed limit to the transmission shaft not remove the spiral section, after the transmission shaft rotational speed is accelerated to a certain degree, the rotating disk just removes the spiral section, in case the rotating disk removes the spiral section, the influence of first elastic component to the rotating disk is just become tiny this moment, because the fast rotation of transmission shaft, the spiral section can promote the rotating disk and be close to the second friction ring fast, feedback to the transmission shaft when first friction ring and second friction ring contact, the speed of restriction transmission shaft, such setting can be with less initiation power guide rotating disk removal, after the rotating disk removes the spiral section, the driving force that the spiral section produced is great, guarantee that enough frictional force can feed back to the transmission shaft on the transmission shaft and slow down.
The rotating disc moves to the spiral section after the rotating speed of the transmission shaft exceeds a fixed speed value, namely a speed limiting set value, and the speed value is usually larger than the normal running speed of applied equipment (such as a vertical feeding hopper or other lifting equipment), and the speed limiting set value can be adjusted by replacing the first elastic piece, so that the invention is suitable for lifting devices with different running speeds, the initiating effect is consistent with the effect of starting a strong electric system by weak current control so as to realize high-power output, but the invention realizes the effect by a mechanical structure, thereby avoiding the instability of an electric control system.
Further, when the spiral section is in a right-hand rotation and the speed limiting box moves upwards relative to the rack, the blowing direction of the blade faces to the left, and when the spiral section is in a left-hand rotation and the speed limiting box moves upwards relative to the rack, the blowing direction of the blade faces to the right.
The direction of rotation of the helical segment is matched to the direction of blade blowing, for example: the spiral section of dextrorotation cooperatees the blade to blow towards left, when the rotor disk rotates, it causes the rotor disk to follow straight section and right-hand movement to blow to left, when moving to the spiral section, the spiral section makes the rotor disk continue right-hand movement, realize the effect that takes over with the blade is blown, then as long as the transmission shaft is still rotating, the rotor disk can keep being pushed the effect by right, make first friction ring and second friction ring contact, the rotor disk no longer produces the removal because of speed variation, but mainly because the thrust effect of spiral section keeps the state, make frictional force always exist, from realizing that the speed limit setting value is greater than elevating gear's normal operating speed, but elevating gear rotational speed after being limited can be less than normal operating speed.
Further, when the second elastic piece is compressed to the limit, a space is reserved between the second friction ring and the tail end of the corresponding spiral section.
The first friction ring and the second friction ring are prevented from being strongly extruded to form a clamping state when the spiral section pushes the rotating disc to move.
Further, a sliding groove along the length direction of the shell is formed in the inner wall of the shell, a protruding edge extending into the sliding groove and in sliding connection with the sliding groove is formed in the outer wall of the second friction ring, an adjusting ring is arranged between the second elastic piece and the inner end face of the shell, which is close to the second elastic piece, a threaded hole is formed in the end portion of the shell, an adjusting bolt is arranged in the threaded hole, and the adjusting bolt penetrates through the threaded hole to be propped against the adjusting ring.
The adjusting ring and the adjusting bolt can enable the second elastic piece to have an adjusting effect of moving distance to the rotating disc, so that when the rotating disc moves to the tail end of the spiral section, the pressure between the first friction ring and the second friction ring can be adjusted, and the second friction ring and the first friction ring have different friction forces through rotating the adjusting bolt, so that the effect of reducing the rotating speed of the transmission shaft and even stopping rotating is further generated.
Furthermore, by enabling the adjusting bolts to have different screwing lengths and different friction forces between the second friction ring and the first friction ring, different speed limiting braking effects on the transmission shaft are achieved, and the rotating speed of the transmission shaft can be reduced to be lower than the normal rotating speed.
Further, the two first elastic pieces are uniform in shape and size, the two first elastic pieces are symmetrical relative to the rotating disc, one end of each first elastic piece is connected to the inner end face of the shell, and the other end of each first elastic piece is propped against the rotating disc through the thrust bearing.
The first elastic piece only generates resistance to the rotating disc which moves due to blowing, does not influence the rotation of the rotating disc, and can realize speed limitation of the transmission shaft no matter in a forward rotating state or a reverse rotating state of the transmission shaft by matching the two first elastic pieces with the two spiral sections.
Further, when the transmission shaft is static, the two first elastic pieces are in a natural state, the rotating disc is positioned in the middle of the straight section, and the elastic coefficient of the first elastic pieces is smaller than that of the second elastic pieces.
The first elastic piece only limits the movement generated by rotating and blowing the rotating disc when the transmission shaft is in a certain rotating speed range (namely, the normal operating speed range of the lifting device) without affecting other factors, so that the elastic coefficient of the first elastic piece can be smaller, the second elastic piece needs to enable the first friction ring to be closely attached to the second friction ring so as to realize friction deceleration, and the second elastic piece needs to have a larger elastic coefficient.
Further, the casing includes linking bridge and connecting cylinder, the both ends of connecting cylinder all are equipped with the linking bridge, two the linking bridge is located the inboard opposite side of connecting cylinder constitutes the interior terminal surface of casing, is equipped with the through-hole that supplies the transmission shaft to pass on the linking bridge, and the last array of linking bridge in the through-hole outside has the bleeder vent.
Further, the through hole is connected with the transmission shaft through a deep groove ball bearing.
Through the technical scheme, the invention has the beneficial effects that:
the rack is connected to the outer frame of the lifting device, the speed limiting box is connected to the top end or the bottom end of the box body for carrying people or goods, and only two ends of the transmission shaft extend out of the speed limiting box and are connected with the gears meshed with the rack.
According to the invention, the lifting device with different running speeds can be adapted by replacing different first elastic pieces, and the state of the lifting device after being limited in speed can be adjusted by rotating the adjusting nut.
According to the invention, the lifting device can be decelerated or braked when the running speed of the lifting device is abnormal through the adjustment of the adjusting bolt, the lifting device can be slowly lowered in a state lower than the normal running speed, the safety of people or objects is ensured, and the lifting device is convenient to maintain and rescue.
The invention has reasonable structure and high safety, can adapt to various working conditions by replacing the first elastic piece and rotating the adjusting bolt, has rapid speed limiting response to the lifting device, has adjustable speed limiting effect, ensures that the lifting device slowly descends in a state lower than the normal running speed, and is at the lowest end after reaching the safest state, thereby facilitating rescue and maintenance.
The invention does not use a weak current control system, realizes the speed limiting braking of the lifting device only by the self-feedback effect of the mechanical structure, and has the advantages of quick response, good speed limiting effect and no environmental influence.
The invention is not only suitable for the existing up-down lifting device, but also suitable for various structures which need unidirectional operation or bidirectional speed-limiting operation in other operation directions.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a front view of the speed governor of the present invention;
FIG. 3 is a front cross-sectional view of the speed governor of the present invention;
fig. 4 is an enlarged view of a portion a of fig. 3;
FIG. 5 is a schematic (partial) view of the structure of the drive shaft of the present invention;
FIG. 6 is a schematic view of the structure of the rotating disc of the present invention;
FIG. 7 is a schematic view of the structure of the invention attached to a vertical loading hopper;
fig. 8 presents a schematic view of the structure of the invention attached to an elevator.
The reference numerals in the drawings are: 1. a rack; 2. a housing; 3. a transmission shaft; 4. a friction mechanism; 5. a gear; 6. a rotating disc; 7. a first friction ring; 8. a second friction ring; 9. a first elastic member; 10. a second elastic member; 11. a guide groove; 12. a shaft hole; 13. a guide block; 14. a vent hole; 15. a blade; 16. a helical section; 17. a straight section; 18. a chute; 19. an adjusting ring; 20. an adjusting bolt; 21. a thrust bearing; 22. a connecting bracket; 23. a connecting cylinder; 24. ventilation holes; 25. deep groove ball bearings.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
as shown in fig. 1-2, a speed limiting braking device comprises a speed limiting box and two racks 1, wherein in the embodiment, the racks 1 are long-strip racks;
as shown in fig. 3 to 6, the speed limiting box comprises a shell 2, a transmission shaft 3 and a friction mechanism 4, wherein the transmission shaft 3 is coaxial with the shell 2, two ends of the transmission shaft 3 respectively penetrate through the shell 2 and extend out of the shell 2, two ends of the transmission shaft 3 are provided with gears 5 respectively meshed with the two racks 1, and the friction mechanism 4 is arranged between the transmission shaft 3 and the shell 2;
the friction mechanism 4 includes the rolling disc 6, first friction ring 7 and second friction ring 8, the rolling disc 6 is connected on transmission shaft 3, produces along the gliding trend of transmission shaft 3 when rotatory with transmission shaft 3, and the both sides of rolling disc 6 all are equipped with first elastic component 9, in this embodiment, first elastic component 9 is the compression spring that the diameter is less spring wire made, and the wire diameter of first elastic component 9 is 0.5mm in this embodiment, all be connected with first friction ring 7 on the both sides face of rolling disc 6, all there is second friction ring 8 on the casing 2 inner wall of rolling disc 6 both sides, first friction ring 7 and second friction ring 8 are the cyclic annular body that friction material made, second friction ring 8 is sliding state along casing 2 length direction, all is equipped with second elastic component 10 between the casing 2 inner end face that two second friction rings 8 are close to each other, second elastic component 10 is the compression spring that the diameter is greater spring wire made, and the diameter of second elastic component 10 is 10mm in this embodiment, when the first friction ring and the first friction ring 7 of first friction ring and the second friction ring 8 have a certain degree of friction material to compress tightly when the first friction ring 7 and the first friction ring 8 have the corresponding friction ring 7, and the first friction ring 7 when the first friction ring is contacted with the first friction ring 7 and the first friction ring and the second friction ring 7 has a great degree of friction ring 8.
Be equipped with guide way 11 on the transmission shaft 3, rotor disk 6 cover is on transmission shaft 3, and rotor disk 6 center is equipped with shaft hole 12, be equipped with on the inner wall of shaft hole 12 and stretch into the guide block 13 in the guide way 11, be arrayed with ventilation hole 14 and inclined blade 15 on the rotor disk 6, when rotor disk 6 was rotatory, blade 15 cut air formed the effect of blowing.
The guide groove 11 is formed by two spiral sections 16 and a straight section 17, two ends of the straight section 17 are respectively communicated with one spiral section 16, the rotation direction, the screw pitch and the total length of the two spiral sections 16 are the same, when the second elastic piece 10 is in a natural state, each second friction ring 8 corresponds to the middle position of one spiral section 16, two guide grooves 11 are arranged in the embodiment, more guide grooves 11 can be further arranged under the condition of ensuring enough strength, and the plurality of guide grooves 11 are distributed outside the transmission shaft 3 in an array mode.
When the spiral direction of the spiral section 16 is right-handed and the speed limiting box moves upwards relative to the rack, the blowing direction of the blade 15 is left-handed, and when the spiral direction of the spiral section 16 is left-handed and the speed limiting box moves upwards relative to the rack, the blowing direction of the blade 15 is right-handed, in this embodiment: the spiral section 16 is right-handed, and the blowing direction of the blade 15 is left-handed.
The second elastic member 10 is compressed to the limit with a space between the second friction ring 8 and the end of the corresponding spiral segment 16.
The inner wall of the shell 2 is provided with a chute 18 along the length direction of the shell 2, the outer wall of the second friction ring 8 is provided with a convex ridge which extends into the chute 18 and is in sliding connection with the chute 18, an adjusting ring 19 is arranged between the second elastic piece 10 and the inner end surface of the shell 2 which is close to the second elastic piece, the end part of the shell 2 is provided with a threaded hole, an adjusting bolt 20 is arranged in the threaded hole, the adjusting bolt 20 passes through the threaded hole to be propped against the adjusting ring 19, and when the adjusting bolt 20 is rotated, the adjusting bolt 20 can prop against the adjusting ring 19.
The two first elastic pieces 9 are identical in shape and size, the two first elastic pieces 9 are symmetrical relative to the rotating disc 6, one end of each first elastic piece 9 is connected to the inner end face of the shell 2, and the other end of each first elastic piece is pressed against the rotating disc 6 through the thrust bearing 21.
When the transmission shaft 3 is stationary, the two first elastic pieces 9 are in a natural state, and the rotating disc 6 is positioned in the middle of the straight section 17.
The shell 2 comprises a connecting support 22 and a connecting cylinder 23, the connecting supports 22 are arranged at two ends of the connecting cylinder 23, two opposite side surfaces of the connecting supports 22, which are positioned at the inner side of the connecting cylinder 23, form an inner end surface of the shell 2, through holes for the transmission shaft 3 to pass through are formed in the connecting supports 22, and ventilation holes 24 are arrayed in the connecting supports at the outer sides of the through holes.
The through hole is connected with the transmission shaft through a deep groove ball bearing 25.
As shown in fig. 7, a speed limiting braking device of this embodiment is disposed on a vertical feeding hopper, a speed limiting box is connected to a coal hopper, a rack 1 is fixed on a frame, a gear 5 of the speed limiting box is meshed with the rack 1 when the coal hopper is running up and down, and the speed of the coal hopper is low (relative to the state when the coal hopper is running abnormally) when the coal hopper is running normally, so that the rotation speed of the gear 5 is also low, and when a transmission shaft 3 rotates, the blades 15 of a rotating disc 6 are blown small, so that the rotating disc 6 can only move on a straight section 17 of a guide groove 11.
When the coal bucket is abnormal, (such as a traction rope is broken), the coal bucket slides down quickly, the speed is gradually increased, the gear 5 is meshed with the rack 1, the rotating speed of the gear 5 is also increased, when the rotating speed of the transmission shaft 3 with the rotating disc 6 is increased to a certain degree, the reaction force of the air blowing of the rotating disc 6 enables the rotating disc 6 to move to a spiral section 16, at the moment, the spiral section 16 enables the rotating disc 6 to approach to a second friction ring 8, the first friction ring 7 and the second friction ring 8 are contacted, friction force is generated, the rotating speed of the transmission shaft 3 is limited, the rotating speed of the gear 5 is further reduced, and the effect of reducing the descending speed of the coal bucket is generated through the meshing of the gear 5 and the rack 1.
Taking this embodiment as an example, in a workshop where coal is lifted, dust is unavoidable, at this time, the device for monitoring speed cannot timely and accurately feed back speed information, but the weight of the vertically loaded coal hopper can reach 1-2 tons after the load is carried by the coal hopper, and the abnormality usually occurs in the lifting process, after the traction rope breaks, even if the haulage rope falls down at normal running speed, such large weight can cause strong impact to equipment or ground at the lower end of the track, under the action of dead weight, the downward sliding speed can be doubled, the equipment or ground at the lower end of the track is difficult to compensate impact, and meanwhile, the impact is accompanied by material splashing, so that the adjusting bolt 20 is rotated, when the rotating disc 6 moves to the end of the spiral section 16, the pushing force of the second elastic piece 10 to the second friction ring 8 is increased to improve friction, so that the coal hopper can slide downwards in a state lower than the normal running speed only when the coal hopper exists under the gravity of the self and the material, thereby ensuring that the coal hopper can safely reach the lowest end of the track in the semi-air when running fault, on the one hand, the raw material in the coal hopper can safely drop down to the ground due to the falling down speed, on the other hand, and the lifting device is avoided to be convenient to maintain due to the falling down.
The invention does not use a weak current control system, realizes the speed limiting braking of the lifting device only through the automatic feedback effect of the mechanical structure, does not need other operations after the lifting device slides down to the lowest end and is maintained, only lifts the hopper upwards, and can recover the initial state without limiting the hopper, namely the lifting device is automatically reacted in the whole process, and has the advantages of safety, effectiveness, good speed limiting effect and no environmental influence.
As shown in fig. 8, the invention is also suitable for equipment with bidirectional vertical operation such as elevators, windlass, stacker crane and the like, can also be used for other equipment with unidirectional or bidirectional operation and inclined or horizontal operation direction and speed limitation, can limit the speed of the equipment when the speed of the equipment is out of control, ensures the safety of the equipment and operators, is not limited by the operation direction of the equipment and is not influenced by the environment.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above examples, and various modifications can be made to the technical solution of the present invention without departing from the spirit of the present invention, i.e., the scope of the disclosure.
Claims (10)
1. The speed limiting braking device is characterized by comprising a speed limiting box and two racks (1);
the speed limiting box comprises a shell (2), a transmission shaft (3) and a friction mechanism (4), wherein the transmission shaft (3) is coaxial with the shell (2), two ends of the transmission shaft (3) respectively penetrate through the shell (2) and extend out of the shell (2), gears (5) respectively meshed with the two racks (1) are arranged at two ends of the transmission shaft (3), and the friction mechanism (4) is arranged between the transmission shaft (3) and the shell (2);
the friction mechanism (4) comprises a rotating disc (6), a first friction ring (7) and a second friction ring (8), wherein the rotating disc (6) is connected to a transmission shaft (3), a sliding trend along the transmission shaft (3) is generated when the rotating disc (6) rotates along with the transmission shaft (3), first elastic pieces (9) are arranged on two sides of the rotating disc (6), the first friction rings (7) are connected to two sides of the rotating disc (6), second friction rings (8) are arranged on the inner walls of the shells (2) on two sides of the rotating disc (6), the second friction rings (8) are in a sliding state along the length direction of the shells (2), second elastic pieces (10) are arranged between the two second friction rings (8) and the inner end surfaces of the shells (2) close to each other, and when the rotating speed of the transmission shaft (3) reaches a certain degree, any one of the first friction rings (7) is in contact with the corresponding second friction rings (8) and limits the rotation of the transmission shaft (3).
2. The speed limiting braking device according to claim 1, characterized in that the transmission shaft (3) is provided with a guide groove (11), the rotating disc (6) is sleeved on the transmission shaft (3), the center of the rotating disc (6) is provided with a shaft hole (12), the inner wall of the shaft hole (12) is provided with a guide block (13) extending into the guide groove (11), the rotating disc (6) is provided with a vent hole (14) and inclined blades (15), and a blowing effect is formed when the rotating disc (6) rotates.
3. A speed limiting brake device according to claim 2, characterized in that the guiding groove (11) is formed by two spiral sections (16) and a straight section (17), two ends of the straight section (17) are respectively communicated with one spiral section (16), the rotation direction, the screw pitch and the total length of the two spiral sections (16) are the same, and when the second elastic piece (10) is in a natural state, each second friction ring (8) corresponds to the middle position of one spiral section (16) respectively.
4. A speed limiting brake according to claim 3, wherein the direction of rotation of the screw section (16) is rightward and the direction of blowing of the vane (15) is leftward when the speed limiting box is moved upward with respect to the rack, and wherein the direction of rotation of the screw section (16) is leftward and the direction of blowing of the vane (15) is rightward when the speed limiting box is moved upward with respect to the rack.
5. A speed limiting brake according to claim 3, characterized in that the second elastic member (10) is compressed to a limit with a distance between the second friction ring (8) and the end of the corresponding screw segment (16).
6. The speed limiting braking device according to claim 1, wherein a sliding groove (18) along the length direction of the shell (2) is formed in the inner wall of the shell (2), a protruding edge which extends into the sliding groove (18) and is in sliding connection with the sliding groove (18) is formed in the outer wall of the second friction ring (8), an adjusting ring (19) is arranged between the second elastic piece (10) and the inner end face of the shell (2) which is close to the second elastic piece, a threaded hole is formed in the end portion of the shell (2), an adjusting bolt (20) is arranged in the threaded hole, and the adjusting bolt (20) penetrates through the threaded hole to be propped against the adjusting ring (19).
7. A speed limiting brake according to claim 3, characterized in that the two first elastic members (9) are of uniform shape and size, the two first elastic members (9) are symmetrical with respect to the rotating disc (6), the uniform end of each first elastic member (9) is connected to the inner end face of the housing (2), and the other end is pressed against the rotating disc (6) through the thrust bearing (21).
8. A speed limiting brake according to claim 3, characterized in that when the transmission shaft (3) is stationary, both first elastic members (9) are in a natural state, the rotating disc (6) is located in the middle of the straight section (17), and the elastic coefficient of the first elastic members (9) is smaller than that of the second elastic members (10).
9. The speed limiting braking device according to claim 1, wherein the casing (2) comprises a connecting bracket (22) and a connecting cylinder (23), the connecting brackets (22) are arranged at two ends of the connecting cylinder (23), two opposite side surfaces of the connecting brackets (22) positioned at the inner side of the connecting cylinder (23) form an inner end surface of the casing (2), through holes for the transmission shaft (3) to pass through are formed in the connecting brackets (22), and ventilation holes (24) are formed in the connecting brackets (22) at the outer sides of the through holes in an array mode.
10. A speed limiting brake according to claim 9, characterized in that the through hole is connected to the drive shaft (3) via a deep groove ball bearing (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311183406.3A CN116924178B (en) | 2023-09-14 | 2023-09-14 | Speed limiting braking device |
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|---|---|---|---|
| CN202311183406.3A CN116924178B (en) | 2023-09-14 | 2023-09-14 | Speed limiting braking device |
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| CN116924178B CN116924178B (en) | 2023-12-08 |
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|---|---|
| CN116924178B (en) | 2023-12-08 |
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