CN213864907U - Elevator overspeed governor safety arrangement - Google Patents
Elevator overspeed governor safety arrangement Download PDFInfo
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- CN213864907U CN213864907U CN202022604743.3U CN202022604743U CN213864907U CN 213864907 U CN213864907 U CN 213864907U CN 202022604743 U CN202022604743 U CN 202022604743U CN 213864907 U CN213864907 U CN 213864907U
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Abstract
The utility model provides an elevator overspeed governor safety arrangement belongs to elevator safety equipment technical field for solve current elevator overspeed governor and can not the safety inspection, and itself lacks effective safety protection's problem. The speed limiting device comprises a speed limiting seat, wherein a seat cover is arranged at the upper end of the speed limiting seat, a main shaft is fixed in the speed limiting seat, a speed limiting wheel is rotatably arranged on the main shaft, a driving component, two temperature sensors and two speed measuring components are arranged on the speed limiting seat, an electric power storage control box is fixed on the speed limiting seat, two symmetrical rope holes are formed in the lower end of the speed limiting seat, and a steel rope is arranged on the speed limiting wheel; the utility model can transmit the fault signal of the dead locking of the speed limiting wheel or high temperature to the electric power storage control box in time by matching the speed measuring component, the temperature sensor and the electric power storage control box, thereby ensuring the safety performance of the elevator; through driving the subassembly and the cooperation of electric power storage control box, animals such as accessible ultrasonic wave and buzzer sound are effectively driven, avoid the mistake to touch safety tongs, damage circuit and other parts, guarantee normal effective work.
Description
Technical Field
The utility model belongs to the technical field of elevator safety equipment, a elevator overspeed governor safety arrangement is related to.
Background
With the development of the times, an elevator as a manned tool provides a convenient life and work mode for people, but the safety is particularly important, and an elevator speed limiter is one of safety control components in an elevator safety protection system. When the elevator is in operation, no matter what reason causes the car to overspeed or even to fall, and all other safety protection devices do not work, the speed limiter and the safety tongs perform linkage action to stop the elevator car.
If the speed limiter fails, a great safety accident can be caused, so that the safety protection of the speed limiter is also important, the common problems of the speed limiter are that the rotation shaft is broken or the bearing is blocked, so that the wheel of the speed limiter is blocked and fails, and the steel wire rope of the speed limiter generates a force for pulling the safety tongs, so that the safety tongs malfunction is caused, or the steel wire rope slips in a rope groove of the wheel of the speed limiter and cannot trigger the action of the safety tongs; small animals such as mice enter the elevator speed limiter through the steel wire rope, and the elevator speed limiter can not work normally and effectively due to the fact that the small animals mistakenly touch the safety tongs or are clamped between the speed limiter wheel and the speed limiter seat or damage an internal circuit.
Based on this, we have provided one kind can effectively test the speed temperature effectively drive elevator overspeed governor safety arrangement of animals such as mouse.
SUMMERY OF THE UTILITY MODEL
The utility model aims at having the above-mentioned problem to current technique, provided an elevator overspeed governor safety arrangement, the technical problem that the device will solve is: how to effectively monitor the security performance of elevator overspeed governor, avoid animals such as mouse to miss the safety tongs simultaneously, or cause circuit and other damages.
The purpose of the utility model can be realized by the following technical proposal:
the utility model provides an elevator overspeed governor safety arrangement, includes the speed limit seat, speed limit seat upper end is equipped with the seat lid, and the inside main shaft that is fixed with of speed limit seat rotates on the main shaft and is provided with the speed limit wheel, is provided with on the speed limit seat and drives subassembly, two temperature sensor and two speed measuring subassembly, is fixed with the electrical storage control box on the speed limit seat, and the rope hole of two symmetries is seted up to speed limit seat lower extreme, is equipped with the steel cable on the speed limit wheel, and the steel cable passes two rope holes in proper order.
The utility model discloses a theory of operation: the speed limiting seat is installed on an elevator machine room, a steel rope sequentially penetrates through two rope holes and is wound around a speed limiting wheel, the steel rope normally moves to drive the speed limiting wheel to rotate, the electric storage control box is connected with an elevator control system, and meanwhile, the electric storage control box provides electric energy for each part; when the speed measuring component detects that the instantaneous speed of the speed limiting wheel exceeds the normal range of the instantaneous running speed of the elevator, if the main shaft is broken or the speed limiting wheel is stuck by an internal bearing, so that the speed limiting wheel is stuck and fails, the speed measuring component sends a signal to the electric power storage control box, the electric power storage control box sends a fault signal to the elevator control system, the elevator control system sends an elevator running stopping signal, the elevator is stopped in time, the safety performance of the elevator is guaranteed, and the maintenance is reminded; the two temperature sensors are used for monitoring the internal temperature of the device in real time, when the temperature sensors monitor that the temperature is abnormal, if the steel rope and the speed limiting wheel generate relative friction, high temperature is generated, the temperature sensors send signals to the electric storage control box, the electric storage control box sends fault signals to the elevator control system, the elevator control system sends elevator operation stopping signals, the elevator is stopped in time, the safety performance of the elevator is guaranteed, and maintenance is reminded; when animals such as mouse are close to this device, animals such as mouse can be monitored to the subassembly of driveing to send ultrasonic wave and buzzer sound, drive animals such as mouse, avoid animals such as mouse to get into this device from the rope hole inside, cause circuit or other damages, guarantee this device ability normal effective work.
Reinforcing plates are fixed to the front side and the rear side of the speed limiting seat, two ends of the main shaft are fixed to the reinforcing plates, two mounting holes I are formed in the two sides of the speed limiting seat, mounting plates are arranged at the two ends of the upper side of the speed limiting seat, and the temperature sensor is fixed to the upper end of the mounting plate in the corresponding position.
Structure more than adopting, reinforcing plate have and strengthen stabilizing effect, and mounting hole one is used for the mount pad lid, and temperature sensor is dismantled to the mounting panel easy to assemble.
Mounting holes II are formed in the two sides of the seat cover, the mounting holes II are arranged corresponding to the mounting holes I, mounting connecting rods are arranged between the mounting holes II and the mounting holes I corresponding to the mounting holes II, and a plurality of avoiding grooves are formed in the lower side of the seat cover.
By adopting the structure, the mounting hole II is matched with the mounting hole I, the connecting rod is convenient to disassemble, assemble and install, the overhaul is carried out, and the avoiding groove is used for avoiding the speed measuring assembly and the temperature sensor.
The speed measuring component comprises a laser emitter and a laser receiver, the laser emitter and the laser receiver are respectively fixed at two sides of the upper end of the speed limiting seat, the laser emitter and the laser receiver are opposite in position, and the laser emitter and the laser receiver are both electrically connected with the power storage control box.
By adopting the structure, the laser emitter emits laser signals, the laser receiver receives the laser signals, the laser emitter emits the laser signals, when the speed limiting wheel operates stably, the signal receiving frequency is stable, when the speed limiting wheel operates stably and breaks down, the signal receiving frequency changes instantaneously so as to judge whether the speed limiter wheel operates synchronously with the elevator, and transmits the change signals to the electric power storage control box, and the electric power storage control box judges whether the speed limiter wheel operates normally.
The driving assembly comprises an ultrasonic driving device, infrared sensors and a buzzer, the number of the ultrasonic driving device and the number of the infrared sensors are two, the two ultrasonic driving devices are fixed on two sides of the speed limiting seat respectively, the two infrared sensors are fixed at the lower end of the speed limiting seat, the positions of the infrared sensors correspond to the rope holes, the infrared sensors are located on the outer sides of the rope holes corresponding to the positions, the buzzer is fixed on the speed limiting seat, and the ultrasonic driving device, the infrared sensors and the buzzer are all electrically connected with the power storage control box.
Structure more than adopting, when animals such as mouse are close to this device, animals such as mouse are monitored to infrared sensor to with signal transmission to electrical storage control box, electrical storage control box control ultrasonic wave drives ware and bee calling organ work, and the ultrasonic wave drives the ware and sends the ultrasonic wave, and bee calling organ sends the buzzing, drives animals such as mouse, avoids animals such as mouse to get into this device from the rope hole inside, causes circuit or other damages, guarantees that this device can normally effectively work.
The speed limiting wheel consists of an inner wheel seat and a wheel plate, the inner wheel seat is rotatably arranged on the main shaft, the wheel plate is fixed on the inner wheel seat, a plurality of spaced wheel holes which are uniformly distributed on the circumference are formed in the wheel plate, and the laser emitter and the laser receiver are positioned on two sides of the spaced wheel holes.
Structure more than adopting, interior wheel base rotates and sets up on the main shaft, guarantees wheel board and steel cable synchronous motion, and interval round hole and laser emitter and laser receiver cooperation, laser emitter transmission laser signal only pass through interval round hole, just can be received by laser receiver for judge whether steady rotation of speed limiting wheel has not the damage.
Compared with the prior art, this elevator overspeed governor safety arrangement has following advantage:
1. through the matching of the speed measuring component, the temperature sensor and the electric power storage control box, when the speed limiting wheel is blocked or the temperature in the device is overhigh, an abnormal fault signal can be transmitted to the electric power storage control box, the electric power storage control box can send out a fault signal and an overhaul signal in time, the elevator can be stopped in time, and the safety performance of the elevator is ensured;
2. through driving the subassembly and the cooperation of electric power storage control box, animals such as accessible ultrasonic wave and buzzer sound are effectively driven, avoid the mistake to touch safety tongs, or cause circuit and other damages, guarantee that this device can normally effectively work.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of the three-dimensional structure of the present invention with the cover removed;
FIG. 3 is a schematic perspective view of a part of the present invention;
in the figure: the device comprises a speed limiting seat 1, a rope hole 1a, a mounting hole I1 b, a mounting plate 1c, a seat cover 2, a mounting hole II 2a, a laser emitter 3, a laser receiver 4, a temperature sensor 5, an ultrasonic wave driver 6, a main shaft 7, an infrared sensor 8, a steel rope 9, a reinforcing plate 10, a buzzer 11, a speed limiting wheel 12, an inner wheel seat 12a, a wheel plate 12b, a wheel hole 12c and an electric power storage control box 13.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-3, the embodiment provides a safety protection device for an elevator speed limiter, which includes a speed limiting seat 1, a seat cover 2 is arranged at the upper end of the speed limiting seat 1, a main shaft 7 is fixed inside the speed limiting seat 1, in the embodiment, the fixing manner adopts a key connection, a speed limiting wheel 12 is rotatably arranged on the main shaft 7, a driving assembly, two temperature sensors 5 and two speed measuring assemblies are arranged on the speed limiting seat 1, and an electric power storage control box 13 is fixed on the speed limiting seat 1;
the speed limiting seat 1 is installed on an elevator machine room, a steel rope 9 sequentially penetrates through two rope holes 1a and is wound on a speed limiting wheel 12, the steel rope 9 normally moves to drive the speed limiting wheel 12 to rotate, an electric storage control box 13 is connected with an elevator control system, and meanwhile, the electric storage control box 13 provides electric energy for all parts; when the speed measuring component detects that the instantaneous speed of the speed limiting wheel 12 exceeds the normal range of the instantaneous running speed of the elevator, if the main shaft 7 is broken or the speed limiting wheel 12 is jammed due to the fact that a bearing in the speed limiting wheel 12 is jammed and fails, the speed measuring component sends a signal to the electric storage control box 13, the electric storage control box 13 sends a fault signal to the elevator control system, the elevator control system sends an elevator running stopping signal, the elevator is stopped in time, the safety performance of the elevator is guaranteed, and maintenance is reminded; the two temperature sensors 5 are used for monitoring the internal temperature of the device in real time, when the temperature sensors 5 monitor abnormal temperature, if the steel rope 9 and the speed limiting wheel 12 generate relative friction and generate high temperature, the temperature sensors 5 send signals to the electric storage control box 13, the electric storage control box 13 sends fault signals to the elevator control system, the elevator control system sends elevator operation stopping signals, the elevator is stopped in time, the safety performance of the elevator is guaranteed, and maintenance is reminded; when animals such as mouse are close to this device, animals such as mouse can be monitored to the subassembly of driveing to send ultrasonic wave and buzzer sound, drive animals such as mouse, avoid animals such as mouse to get into this device from rope hole 1a inside, cause circuit or other damages, guarantee that this device can normally effectively work.
Reinforcing plates 10 are fixed on the front side and the rear side of the speed limiting seat 1, in the embodiment, the fixing mode adopts welding, two ends of the main shaft 7 are fixed on the reinforcing plates 10, in the embodiment, the fixing mode adopts interference fit connection, two mounting holes 1b are formed in two sides of the speed limiting seat 1, mounting plates 1c are arranged at two ends of the upper side of the speed limiting seat 1, and the temperature sensor 5 is fixed at the upper end of the mounting plate 1c in the corresponding position; the reinforcing plate 10 has a reinforcing and stabilizing effect, the mounting hole I1 b is used for mounting the seat cover 2, and the mounting plate 1c facilitates mounting and dismounting of the temperature sensor 5.
Mounting holes II 2a are formed in the two sides of the seat cover 2, the mounting holes II 2a are positioned corresponding to the mounting holes I1 b, a mounting connecting rod is arranged between the mounting holes II 2a and the mounting holes I1 b in the corresponding positions, and a plurality of avoidance grooves are formed in the lower side of the seat cover 2; the mounting hole II 2a is matched with the mounting hole I1 b, the connecting rod is convenient to disassemble, assemble and install, maintenance is carried out, and the avoiding groove is used for avoiding the speed measuring assembly and the temperature sensor 5.
The speed measuring component comprises a laser emitter 3 and a laser receiver 4, the laser emitter 3 and the laser receiver 4 are respectively fixed at two side parts of the upper end of the speed limiting seat 1, in the embodiment, the fixing mode adopts bolt connection, the laser emitter 3 and the laser receiver 4 are opposite, and the laser emitter 3 and the laser receiver 4 are both electrically connected with the power storage control box 13; the laser emitter 3 emits laser signals, the laser receiver 4 receives the laser signals, the laser emitter 3 emits the laser signals, when the speed limiting wheel 12 runs stably, the signal receiving frequency is stable, when the speed limiting wheel 12 runs stably and breaks down, the signal receiving frequency changes instantaneously to judge whether the speed limiter wheel runs synchronously with the elevator, the change signals are transmitted to the electricity storage control box 13, and the electricity storage control box 13 judges whether the speed limiter wheel works normally.
The driving component comprises two ultrasonic wave driving devices 6, two infrared sensors 8 and two buzzers 11, the two ultrasonic wave driving devices 6 and the two infrared sensors 8 are respectively fixed on two sides of the speed limiting seat 1, the two infrared sensors 8 are fixed at the lower end of the speed limiting seat 1, the positions of the infrared sensors 8 correspond to the rope holes 1a, the infrared sensors 8 are located on the outer sides of the rope holes 1a at the corresponding positions, and the buzzers 11 are fixed on the speed limiting seat 1;
when animals such as mice approach the device, the infrared sensor 8 monitors the animals such as mice and transmits signals to the electric power storage control box 13, the electric power storage control box 13 controls the ultrasonic wave driver 6 and the buzzer 11 to work, the ultrasonic wave driver 6 emits ultrasonic waves, the buzzer 11 emits buzzing sounds to drive the animals such as mice, the animals such as mice are prevented from entering the device from the rope hole 1a, the safety tongs are touched by mistake, or circuits and other damages are caused.
The speed limiting wheel 12 is composed of an inner wheel seat 12a and a wheel plate 12b, the inner wheel seat 12a is rotatably arranged on the spindle 7, the wheel plate 12b is fixed on the inner wheel seat 12a, in the embodiment, the fixing mode adopts casting molding, a plurality of spaced wheel holes 12c which are uniformly distributed circumferentially are formed in the wheel plate 12b, and the laser emitter 3 and the laser receiver 4 are positioned on two sides of the spaced wheel holes 12 c;
the inner wheel seat 12a is rotatably arranged on the main shaft 7, the wheel plate 12b and the steel rope 9 are guaranteed to move synchronously, the spacing wheel hole 12c is matched with the laser emitter 3 and the laser receiver 4, the laser emitter 3 emits laser signals, and the laser signals are only received by the laser receiver 4 through the spacing wheel hole 12c so as to judge whether the speed limiting wheel 12 rotates stably or not and have no damage.
In the present embodiment, the above-mentioned electric components such as the laser receiver 4, the ultrasonic driver 6, and the storage battery control box 13 are all prior art products, and can be purchased and used in the market.
The utility model discloses a theory of operation:
the speed limiting seat 1 is installed on an elevator machine room, a steel rope 9 sequentially penetrates through two rope holes 1a and is wound on a speed limiting wheel 12, the steel rope 9 normally moves to drive the speed limiting wheel 12 to rotate, and an electric power storage control box 13 is connected with an elevator control system;
the laser emitter 3 emits laser signals, the signals are received by the laser receiver 4 through the spacing wheel holes 12c, when the speed measurement component detects that the instantaneous speed of the speed limiting wheel 12 exceeds the normal range of the instantaneous running speed of the elevator, if the main shaft 7 is broken or the internal bearing of the speed limiting wheel 12 is blocked to cause the blocking failure of the speed limiting wheel 12, the speed measurement component sends abnormal signals to the electric storage control box 13, the electric storage control box 13 sends fault signals to the elevator control system, the elevator control system can send elevator running stopping signals to stop the elevator in time, the safety performance of the elevator is guaranteed, and maintenance is reminded;
when the temperature sensor 5 monitors that the temperature is abnormal, if the steel rope 9 and the speed limiting wheel 12 generate relative friction to generate high temperature, the temperature sensor 5 sends a signal to the electric storage control box 13, the electric storage control box 13 sends a fault signal to the elevator control system, the elevator control system sends an elevator operation stopping signal to stop the elevator in time, the safety performance of the elevator is guaranteed, and maintenance is reminded;
when animals such as mice approach the device, the infrared sensor 8 monitors the animals such as mice and transmits signals to the electric power storage control box 13, the electric power storage control box 13 controls the ultrasonic wave driver 6 and the buzzer 11 to work, the ultrasonic wave driver 6 emits ultrasonic waves, the buzzer 11 emits buzzing sounds to drive the animals such as mice, the animals such as mice are prevented from entering the device from the rope hole 1a, the safety tongs are touched by mistake, or circuits and other damages are caused.
In conclusion, through the matching of the speed measuring component, the temperature sensor 5 and the electric power storage control box 13, when the speed limiting wheel 12 is blocked or the temperature in the device is overhigh, an abnormal fault signal can be transmitted to the electric power storage control box 13, the electric power storage control box 13 can send out a fault signal and a maintenance signal in time, the elevator is stopped in time, and the safety performance of the elevator is ensured; through driving the subassembly and the cooperation of electric power storage control box 13, animals such as accessible ultrasonic wave and buzzer sound are effectively driven and animals such as mouse avoid the mouse, the mistake touches safety tongs, or cause circuit and other damages, guarantee that this device can normally effectively work.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (6)
1. The utility model provides an elevator overspeed governor safety arrangement, includes speed limit seat (1), a serial communication port, speed limit seat (1) upper end is equipped with seat cover (2), speed limit seat (1) inside is fixed with main shaft (7), it is provided with speed limit wheel (12) to rotate on main shaft (7), be provided with on speed limit seat (1) and drive the subassembly, two temperature sensor (5) and two components that test the speed, be fixed with electric power storage control box (13) on speed limit seat (1), two rope holes (1a) of symmetry are seted up to speed limit seat (1) lower extreme, be equipped with steel cable (9) on speed limit wheel (12), two rope holes (1a) are passed in proper order in steel cable (9).
2. The safety protection device for the speed limiter of the elevator according to claim 1, wherein reinforcing plates (10) are fixed to the front side and the rear side of the speed limiting seat (1), two ends of a main shaft (7) are fixed to the reinforcing plates (10), two mounting holes I (1b) are formed in the two sides of the speed limiting seat (1), mounting plates (1c) are arranged at the two ends of the upper side of the speed limiting seat (1), and the temperature sensor (5) is fixed to the upper ends of the mounting plates (1c) in the corresponding position.
3. The safety protection device for the speed limiter of the elevator according to claim 2, wherein two mounting holes II (2a) are formed in two sides of the seat cover (2), the mounting holes II (2a) are located corresponding to the mounting holes I (1b), a mounting connecting rod is arranged between the mounting holes II (2a) and the mounting holes I (1b) in the corresponding positions, and a plurality of avoiding grooves are formed in the lower side of the seat cover (2).
4. The elevator speed limiter safety protection device according to claim 2 or 3, characterized in that the speed measuring component comprises a laser emitter (3) and a laser receiver (4), the laser emitter (3) and the laser receiver (4) are respectively fixed at two sides of the upper end of the speed limiting seat (1), the laser emitter (3) and the laser receiver (4) are opposite in position, and the laser emitter (3) and the laser receiver (4) are both electrically connected with the power storage control box (13).
5. The elevator speed limiter safety protection device according to claim 1, wherein the driving assembly comprises two ultrasonic driving devices (6), two infrared sensors (8) and a buzzer (11), the two ultrasonic driving devices (6) and the two infrared sensors (8) are respectively fixed on two sides of the speed limiting seat (1), the two infrared sensors (8) are fixed at the lower end of the speed limiting seat (1), the positions of the infrared sensors (8) correspond to the rope holes (1a), the infrared sensors (8) are located on the outer sides of the rope holes (1a) in the corresponding positions, the buzzer (11) is fixed on the speed limiting seat (1), and the ultrasonic driving devices (6), the infrared sensors (8) and the buzzer (11) are all electrically connected with the power storage control box (13).
6. The elevator speed limiter safety protection device according to claim 4, wherein the speed limiting wheel (12) is composed of an inner wheel seat (12a) and a wheel plate (12b), the inner wheel seat (12a) is rotatably arranged on the spindle (7), the wheel plate (12b) is fixed on the inner wheel seat (12a), a plurality of circumferentially and uniformly distributed spaced wheel holes (12c) are formed in the wheel plate (12b), and the laser emitter (3) and the laser receiver (4) are positioned on two sides of the spaced wheel holes (12 c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022604743.3U CN213864907U (en) | 2020-11-12 | 2020-11-12 | Elevator overspeed governor safety arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022604743.3U CN213864907U (en) | 2020-11-12 | 2020-11-12 | Elevator overspeed governor safety arrangement |
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| Publication Number | Publication Date |
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| CN213864907U true CN213864907U (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022604743.3U Active CN213864907U (en) | 2020-11-12 | 2020-11-12 | Elevator overspeed governor safety arrangement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455423A (en) * | 2022-03-24 | 2022-05-10 | 常熟理工学院 | Elevator safety tongs-speed limiter linkage device |
-
2020
- 2020-11-12 CN CN202022604743.3U patent/CN213864907U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455423A (en) * | 2022-03-24 | 2022-05-10 | 常熟理工学院 | Elevator safety tongs-speed limiter linkage device |
| CN114455423B (en) * | 2022-03-24 | 2022-11-25 | 常熟理工学院 | Elevator safety tongs-overspeed governor aggregate unit |
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