CN111840832B - Speed-controllable descent control device - Google Patents
Speed-controllable descent control device Download PDFInfo
- Publication number
- CN111840832B CN111840832B CN202010855654.8A CN202010855654A CN111840832B CN 111840832 B CN111840832 B CN 111840832B CN 202010855654 A CN202010855654 A CN 202010855654A CN 111840832 B CN111840832 B CN 111840832B
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- thick bamboo
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- 238000013016 damping Methods 0.000 claims abstract description 39
- 238000009434 installation Methods 0.000 claims abstract description 28
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 14
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 14
- 241001330002 Bambuseae Species 0.000 claims abstract description 14
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 14
- 239000011425 bamboo Substances 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000000712 assembly Effects 0.000 claims description 15
- 238000000429 assembly Methods 0.000 claims description 15
- 239000000872 buffer Substances 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 208000027418 Wounds and injury Diseases 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B1/00—Devices for lowering persons from buildings or the like
- A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B1/00—Devices for lowering persons from buildings or the like
- A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
- A62B1/18—Other single parts for rope lowering-devices, e.g. take-up rollers for ropes, devices for shooting ropes
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Lowering Means (AREA)
Abstract
The invention provides a descent control device with controllable speed, and belongs to the technical field of fire-fighting and life-saving tools. Including mounting panel, a roll-up section of thick bamboo, the installation axle is slowly fallen the rope, the installation axle is fixed to be set up on the mounting panel, a roll-up section of thick bamboo rotates to be connected on the installation axle, slowly fall the one end of rope and fix on a roll-up section of thick bamboo, be provided with a magnetic damping mechanism between the both ends of installation axle and the roll-up section of thick bamboo respectively, magnetic damping mechanism includes the electromagnetic component who winds the coil wire of establishing, slowly fall the one end of installing the lock hook on the rope and be provided with a current control switch, link to each other with current control switch after two coil wires are parallelly connected, the circular telegram wire between current control switch and the coil wire is lax to be penetrated in the perforation. The invention has the advantages of high reliability and the like.
Description
Technical Field
The invention belongs to the technical field of fire-fighting lifesaving tools, and relates to a descent control device with controllable speed.
Background
The lifesaving descent control device is one common fire-fighting lifesaving device, and when fire disaster occurs, the escapers in high building may escape from fire scene via the lifesaving descent control device along the outer wall of the building. Most of the existing modes are damping control, namely friction mode, of the descent control rope or descent control belt, the descent speed needs to be preset, and the descent speed needs to be controlled in real time according to the situation of a fire scene, so that the descent safety and the escape efficiency of descent control can be comprehensively considered according to the situation of the scene and the actual situation of escape personnel, the speed is preset before escape in emergency, the escape efficiency is often not quite reasonable, misoperation and misjudgment are caused in high probability, the fire scene is possibly located below the floor where the escape personnel is located, the descent speed needs to be accelerated under the condition of high fire hidden danger, the descent speed also changes greatly along with the change of the descent height, the high drop injury safety hidden danger cannot be controlled at any time, and the speed controllable necessity of the descent control device is embodied in the situations.
Disclosure of Invention
The invention aims to solve the problems existing in the prior art and provide a descent control device with controllable speed, and the technical problem to be solved by the invention is how to control the descent speed and improve the safety.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a speed controllable slow-descent control device, its characterized in that includes mounting panel, a roll-up section of thick bamboo, installation axle and slow-descent rope, the installation axle is fixed to be set up on the mounting panel, a roll-up section of thick bamboo rotates to be connected on the installation axle, the one end of slow-descent rope is fixed on a roll-up section of thick bamboo, the other end of slow-descent rope is provided with a lock hook, be provided with a magnetic force damping mechanism between the both ends of installation axle and the roll-up section of thick bamboo respectively, magnetic force damping mechanism is including fixing the rotary drum on a roll-up section of thick bamboo, the rotary drum rotates to be connected on the installation axle, fixedly provided with a rotating sleeve on the rotary drum, there is a sliding sleeve through spline sliding connection on the installation axle, the guide slot that end to end has on the inner global of sliding sleeve, the rotary drum is provided with a synchronous sleeve sleeved outside the sliding sleeve, the inner wall of the synchronous sleeve is provided with guide blocks inserted in the guide grooves, the outer end of the sliding sleeve is fixedly provided with a fixed disc, the fixed disc can be positioned in the rotary sleeve, a plurality of electromagnetic assemblies are uniformly arranged on the fixed disc in the circumferential direction, the inner wall of the rotary sleeve is fixedly provided with a plurality of permanent magnetic strips corresponding to the electromagnetic assemblies one by one, the guide grooves comprise a plurality of guide sections connected end to end, the number of the guide sections is the same as that of the electromagnetic assemblies, each guide section comprises a straight damping section, an inclined reset section and a crossing section for connecting the damping section and the reset section, the number of the guide blocks is equal to that of the guide sections, and the electromagnetic assemblies and the permanent magnetic strips are mutually exclusive when the guide blocks are positioned in the damping section;
The electromagnetic assembly comprises an armature framework, a coil wire wound on the armature framework and a power supply for connecting the coil wire and the connecting wire; the slow descending rope is internally provided with a perforation, one end of the slow descending rope, provided with a locking hook, is provided with a current control switch, two coil wires are connected in parallel and then connected with the current control switch, and an electrified wire between the current control switch and the coil wires is loosely penetrated in the perforation.
The slow-descending rope is internally provided with a steel wire so that the stretchability of the slow-descending rope is poor, so that an electrified wire in the through hole has good reliability, one end of the slow-descending rope, which is connected with the winding drum, is fixed on the winding drum, the electrified wire extending out of the through hole is connected with an annular conductive terminal arranged on the wall of the winding drum, the conductive terminal and the other conductive terminal on the installation shaft are always in a relatively rotatable conductive state, and the conductive terminal on the installation shaft is connected to the coil wire.
When the guide block moves from the head end to the tail end of the crossing section, the electromagnetic assembly gradually moves away from the permanent magnet strip along the axial direction of the sliding sleeve, and in the process, the fixed disk where the electromagnetic assembly is positioned is attached with a certain angle of rotation, so that the electromagnetic assembly is switched from a state of being opposite to the permanent magnet strip to a state that the electromagnetic assembly is positioned at the inner side of the permanent magnet strip; when the guide block moves from the head end of the resetting section to the tail end, the electromagnetic assembly is close to the permanent magnet strip along the axis direction of the sliding sleeve, and in the process, the fixed disc where the electromagnetic assembly is positioned rotates by a certain angle relative to the rotating sleeve, so that the electromagnetic assembly reenters the running track of the permanent magnet strip, and in the rotating process of the fixed disc relative to the rotating sleeve, the motion rule of the electromagnetic assembly relative to the permanent magnet strip is as follows: the electromagnetic component and the permanent magnetic strip are positioned in the same motion track and are mutually close, then the electromagnetic component is far away from the track where the permanent magnetic strip is positioned and returns to the motion track of the permanent magnetic strip after the permanent magnetic strip is overturned, and the electromagnetic component and the permanent magnetic strip circulate in the way, in the process that the electromagnetic component is close to the permanent magnetic strip, the electromagnetic component generates resistance between the rotating drum and the mounting shaft due to mutual exclusion of the electromagnetic component and the permanent magnetic strip, so that the winding drum is driven to slow down, and meanwhile, the bending of the guide groove also enables the electromagnetic component and the permanent magnetic strip to generate resistance and force the winding drum to slow down.
Further, the damping section and the crossing section, the crossing section and the resetting section, and the resetting section and the damping section are in smooth transition.
Further, a buffer spring is connected between the sliding sleeve and the mounting shaft.
The buffer spring has a damping effect on the movement of the sliding sleeve on the mounting shaft and has a buffering effect on the movement of the guide block in the guide groove.
Furthermore, the power supply is a special power supply for fire protection or an independent power supply adapting to a single descent control device.
The independent power supply can reduce the dependence of the fire-fighting special power supply on the reliability of the fire disaster, and improve the reliability of the descent control device.
Further, the independent power supply can be a storage battery arranged on the mounting plate, and the storage battery is connected with a solar panel arranged on the wall surface where the mounting plate is located.
The specific structure of the solar power supply storage battery is related to, and is not described herein because it belongs to the conventional prior art.
The electromagnetic assembly is arranged on the installation shaft, and the installation shaft is in a static state, so that the structure can supply power to the electromagnetic assembly without the structure such as an electric brush, and the reliability and the stability are higher.
As another technical scheme, two coil wires are connected in parallel and then connected with a controller, one end of the slow descending rope, provided with a locking hook, is provided with a wireless switch, the wireless switch can send control signals to the controller in a Bluetooth mode, and the controller can adjust the current value in the coil wires according to the signals sent by the wireless switch.
The wireless power-on mode belongs to the conventional means, and the scheme has certain advantages in terms of structural simplification as another mode for adjusting the slow descent resistance.
Further, the inclination angle between the crossing section and the damping section is larger than the inclination angle between the reset section and the damping section.
The inclination angle between the crossing section and the damping section is larger, so that the electromagnetic assembly starts to deviate in a dislocation manner when approaching to the permanent magnet strip, and larger repulsive force when the distance between the crossing section and the damping section is smaller can be utilized.
Further, there are two electromagnetic assemblies.
After the tension of the slow-falling rope disappears, the slow-falling rope can be automatically rolled up so as to be used by the next user, and the principle of the automatic rolling of the slow-falling rope is as follows: the electromagnetic component and the permanent magnetic strip repel each other, so that the installation shaft rotates relative to the winding drum, the rotating inertia force drives the guide block to smoothly pass through the crossing section and the resetting section, and when the slow descending rope is wound and stopped or cannot be automatically wound, the slow descending rope can be slightly pulled after the slow descending rope releases the bearing, so that the electromagnetic component and the permanent magnetic strip are positioned at the damping section. The rolling process still has the characteristic of a pause type slow rolling.
Besides the characteristics, the descent control device can still have a descent control function under the condition of power failure, namely, the relative speed between the installation shaft and the winding drum is not too high through the cooperation of the guide groove and the guide block.
Drawings
Fig. 1 is a schematic structural view of the descent control device.
Fig. 2 is a schematic perspective view of the winding drum.
Fig. 3 is a cross-sectional view taken along the direction A-A in fig. 1.
Fig. 4 is a schematic view of the channel after deployment.
Fig. 5 is a schematic perspective view of a sliding sleeve.
In the figure, 1, a mounting plate; 2. a winding drum; 3. a mounting shaft; 4. slowly descending the rope; 41. a locking hook; 51. a rotating drum; 52. a rotating sleeve; 53. a sliding sleeve; 54. a synchronizing sleeve; 55. a guide block; 56. a fixed plate; 57. an electromagnetic assembly; 58. a permanent magnet strip; 59. a buffer spring; 6. a guide groove; 61. a damping section; 62. a reset section; 63. the segment is traversed.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 5, the device comprises a mounting plate 1, a winding drum 2, a mounting shaft 3 and a slow descending rope 4, wherein the mounting shaft 3 is fixedly arranged on the mounting plate 1, the winding drum 2 is rotationally connected on the mounting shaft 3, one end of the slow descending rope 4 is fixed on the winding drum 2, the other end of the slow descending rope 4 is provided with a locking hook 41, a magnetic damping mechanism is arranged between the two ends of the mounting shaft 3 and the winding drum 2 respectively, the magnetic damping mechanism comprises a rotary drum 51 fixed on the winding drum 2, the rotary drum 51 is rotationally connected on the mounting shaft 3, a rotary sleeve 52 is fixedly arranged on the rotary drum 51, the mounting shaft 3 is in sliding connection with a sliding sleeve 53 through a spline, a guide groove 6 connected end to end is arranged on the peripheral surface of the inner end of the sliding sleeve 53, a synchronous sleeve 54 sleeved outside the sliding sleeve 53 is arranged on the rotary drum 51, the inner wall of the synchronous sleeve 54 is provided with a guide block 55 inserted in the guide groove 6, the outer end of the sliding sleeve 53 is fixedly provided with a fixed disc 56, the fixed disc 56 can be positioned in the rotating sleeve 52, a plurality of electromagnetic assemblies 57 are circumferentially and uniformly arranged on the fixed disc 56, the inner wall of the rotating sleeve 52 is fixedly provided with a plurality of permanent magnetic strips 58 corresponding to the electromagnetic assemblies 57 one by one, the guide groove 6 comprises a plurality of guide sections connected end to end, the number of the guide sections is the same as that of the electromagnetic assemblies 57, each guide section comprises a flat damping section 61, an inclined reset section 62 and a crossing section 63 for connecting the damping section 61 and the reset section 62, the number of the guide blocks 55 is equal to that of the guide sections, and the electromagnetic assemblies 57 and the permanent magnetic strips 58 are mutually exclusive when the guide blocks 55 are positioned in the damping section 61.
When the guide block 55 moves from the head end to the tail end of the crossing section 63, the electromagnetic assembly 57 is gradually far away from the permanent magnet strip 58 along the axial direction of the sliding sleeve 53, and in the process, the fixed disk 56 where the electromagnetic assembly 57 is located is attached with a certain angle of rotation, so that the state that the electromagnetic assembly 57 is opposite to the permanent magnet strip 58 is switched into the state that the electromagnetic assembly 57 is located on the inner side of the permanent magnet strip 58; when the guide block 55 moves from the head end to the tail end of the reset segment 62, the electromagnetic assembly 57 approaches the permanent magnet strip 58 along the axial direction of the sliding sleeve 53, and in this process, the fixed disc 56 where the electromagnetic assembly 57 is located rotates at a certain angle relative to the rotating sleeve 52, so that the electromagnetic assembly 57 reenters the running track of the permanent magnet strip 58, and it can be seen that in the process that the fixed disc 56 rotates relative to the rotating sleeve 52, the motion rule of the electromagnetic assembly 57 relative to the permanent magnet strip 58 is as follows: the electromagnetic component 57 and the permanent magnetic strip 58 are located in the same motion track and are close to each other, then the electromagnetic component 57 is far away from the track where the permanent magnetic strip 58 is located and returns to the motion track of the permanent magnetic strip 58 after the permanent magnetic strip 58 is overturned, and the circulation is performed, so that in the process that the damping section 61 and the electromagnetic component 57 are close to the permanent magnetic strip 58, resistance is generated between the drum 51 and the mounting shaft 3 due to mutual exclusion of the two, the winding drum 2 is driven to be slowed down, and meanwhile, the bending of the guide groove 6 also causes the two to generate resistance and forces the winding drum 2 to be slowed down.
Smooth transitions are formed between the damping section 61 and the skip section 63, between the skip section 63 and the reset section 62, and between the reset section 62 and the damping section 61.
A buffer spring 59 is connected between the sliding sleeve 53 and the mounting shaft 3. The buffer spring 59 damps the movement of the slide 53 in the mounting shaft 3 and buffers the movement of the guide block 55 in the guide groove 6.
The electromagnetic assembly 57 includes an armature bobbin, a coil wire wound around the armature bobbin, and a power supply connecting the coil wire.
As an alternative, the power supply is a fire-fighting dedicated power supply or an independent power supply adapted to a single descent control device. The independent power supply can reduce the dependence of the fire-fighting special power supply on the reliability of the fire disaster, and improve the reliability of the descent control device.
The independent power supply can be a storage battery arranged on the mounting plate 1, and the storage battery is connected with a solar panel arranged on the wall surface where the mounting plate 1 is arranged. The specific structure of the solar power supply storage battery is related to, and is not described herein because it belongs to the conventional prior art.
The slow descending rope 4 is internally provided with a perforation, one end of the slow descending rope 4 provided with a locking hook 41 is provided with a current control switch, two coil wires are connected in parallel and then connected with the current control switch, and an electrified wire between the current control switch and the coil wires is loosely penetrated in the perforation. The steel wire is arranged in the slow descending rope 4 so that the stretchability of the slow descending rope 4 is poor, the electrified wire in the perforation is good in reliability, one end of the slow descending rope 4 connected with the winding drum 2 is fixed on the winding drum 2, the electrified wire extending out of the perforation is connected with an annular conductive terminal arranged on the drum wall of the winding drum 2, the conductive terminal and the other conductive terminal on the installation shaft 3 are always in a relatively rotatable conductive state, and the conductive terminal on the installation shaft 3 is connected to the coil wire.
The electromagnetic assembly 57 is arranged on the installation shaft 3, and the installation shaft 3 is in a static state, so that the structure can supply power to the electromagnetic assembly 57 without a structure such as a brush, and the reliability and the stability are higher.
As another technical scheme, two coil wires are connected in parallel and then connected with a controller, one end of the slow descending rope 4 provided with the locking hook 41 is provided with a wireless switch, the wireless switch can send control signals to the controller in a Bluetooth mode, and the controller can adjust the current value in the coil wires according to the signals sent by the wireless switch. The wireless power-on mode belongs to the conventional means, and the scheme has certain advantages in terms of structural simplification as another mode for adjusting the slow descent resistance.
The inclination angle between the turn-over section 63 and the damping section 61 is larger than the inclination angle between the return section 62 and the damping section 61. The larger inclination angle between the crossover section 63 and the damping section 61 enables the electromagnetic assembly 57 to start to deviate in a dislocation manner when approaching the permanent magnet strip 58, so that the larger repulsive force can be utilized when the distance between the crossover section and the damping section is smaller.
As shown in fig. 3, there are two electromagnetic assemblies 57, two guide sections of the guide groove, and two permanent magnet strips.
After the tension of the slow descending rope 4 disappears, the slow descending rope 4 can be automatically wound so as to be used by the next user, and the principle of the automatic winding of the slow descending rope 4 is as follows: the electromagnetic component 57 and the permanent magnetic strip 58 repel each other, so that the installation shaft 3 rotates relative to the winding drum 2, the rotating inertia force drives the guide block 55 to smoothly pass through the crossing section 63 and the resetting section 62, and when the slow descending rope 4 is wound and stopped or cannot be automatically wound, the slow descending rope 4 can be slightly pulled after the slow descending rope 4 releases the bearing, so that the electromagnetic component 57 and the permanent magnetic strip 58 are positioned in the damping section 61. The rolling process still has the characteristic of a pause type slow rolling.
In addition to the above features, the descent control device can still have a descent control function under the condition of power failure, that is, the relative speed between the installation shaft 3 and the winding drum 2 is not too fast through the cooperation of the guide groove 6 and the guide block 55.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The utility model provides a speed controllable slowly descending device, its characterized in that includes mounting panel (1), a roll-up section of thick bamboo (2), installation axle (3) and slowly descending rope (4), installation axle (3) fixed setting is on mounting panel (1), roll-up section of thick bamboo (2) rotate and connect on installation axle (3), slowly descending rope (4) one end is fixed on roll-up section of thick bamboo (2), slowly descending rope (4) other end is provided with a lock hook (41), be provided with a magnetic force damping mechanism between both ends of installation axle (3) and roll-up section of thick bamboo (2) respectively, magnetic force damping mechanism is including fixing rotary drum (51) on roll-up section of thick bamboo (2), rotary drum (51) rotate and connect on installation axle (3), fixedly provided with a rotating sleeve (52) on rotary drum (51), be provided with a sliding sleeve (53) through spline sliding connection on installation axle (3), be provided with guide slot (6) of end to end on the inner periphery of sliding sleeve (53), be provided with on rotary drum (51) and be provided with a synchronizing sleeve (56) on the inner wall (56) of synchronous disc (56) can be fixed on the rotating sleeve (52), a plurality of electromagnetic assemblies (57) are uniformly arranged on the circumference of the fixed disc (56), a plurality of permanent magnetic strips (58) which are in one-to-one correspondence with the electromagnetic assemblies (57) are fixedly arranged on the inner wall of the rotating sleeve (52), the guide groove (6) comprises a plurality of guide sections which are connected end to end and have the same number with the electromagnetic assemblies (57), each guide section comprises a straight damping section (61), an inclined resetting section (62) and a crossing section (63) for connecting the damping section (61) and the resetting section (62), the number of guide blocks (55) is equal to that of the guide sections, and the electromagnetic assemblies (57) and the permanent magnetic strips (58) are mutually exclusive when the guide blocks (55) are positioned in the damping section (61);
the electromagnetic assembly (57) comprises an armature framework, a coil wire wound on the armature framework and a power supply for connecting the coil wire and the connecting wire; a perforation is arranged in the slow descending rope (4), one end of the slow descending rope (4) provided with a locking hook (41) is provided with a current control switch, two coil wires are connected in parallel and then connected with the current control switch, and an electrified wire between the current control switch and the coil wires is loosely penetrated in the perforation;
The inclination angle between the crossing section (63) and the damping section (61) is larger than the inclination angle between the resetting section (62) and the damping section (61); the electromagnetic assemblies (57) are two.
2. A speed controllable descent control device according to claim 1, characterized in that the damping section (61) and the trip section (63), the trip section (63) and the reset section (62) and the damping section (61) are all smoothly transited.
3. A speed-controllable descent control device according to claim 2, characterized in that a buffer spring (59) is connected between the sliding sleeve (53) and the mounting shaft (3).
4. A speed controllable descent control device according to claim 3, wherein the power source is a fire protection dedicated power source or an independent power source adapted to a single descent control device.
5. The descent control device according to claim 4, wherein the independent power source is a storage battery arranged on the mounting plate (1), and the storage battery is connected with a solar panel arranged on a wall surface where the mounting plate (1) is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855654.8A CN111840832B (en) | 2020-08-24 | 2020-08-24 | Speed-controllable descent control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855654.8A CN111840832B (en) | 2020-08-24 | 2020-08-24 | Speed-controllable descent control device |
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| Publication Number | Publication Date |
|---|---|
| CN111840832A CN111840832A (en) | 2020-10-30 |
| CN111840832B true CN111840832B (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010855654.8A Active CN111840832B (en) | 2020-08-24 | 2020-08-24 | Speed-controllable descent control device |
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| CN (1) | CN111840832B (en) |
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