CN113928952A - Anti-falling safety protection device for elevator car and elevator - Google Patents
Anti-falling safety protection device for elevator car and elevator Download PDFInfo
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- CN113928952A CN113928952A CN202111255870.XA CN202111255870A CN113928952A CN 113928952 A CN113928952 A CN 113928952A CN 202111255870 A CN202111255870 A CN 202111255870A CN 113928952 A CN113928952 A CN 113928952A
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- safety
- elevator
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- fixing
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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
- B66B5/26—Positively-acting devices, e.g. latches, knives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
- B66B7/08—Arrangements of ropes or cables for connection to the cars or cages, e.g. couplings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention discloses an anti-falling safety protection device for an elevator car, which belongs to the field of elevators and comprises a fixed connecting piece with a longitudinal sliding chute; the upper end of the traction connecting piece is connected with the traction rope, and the lower end of the traction connecting piece is fixed in the sliding groove in a sliding manner through a fastening piece penetrating through the sliding groove; the safety fixing assembly comprises safety fixing clamps located on two sides of the sliding groove and extending outwards, the two sides of the sliding groove are respectively provided with at least one safety fixing clamp, and one end, close to the sliding groove, of each safety fixing clamp is hinged to the fastening piece. The invention also provides an elevator applying the safety protection device, wherein the elevator shaft is additionally provided with the step tooth socket column, when the hauling rope is broken or loosened, the safety fixing clamps at two sides can be rapidly unfolded through the arranged resetting device, and when the far ends of the safety fixing clamps are clamped into the clamping grooves on the step tooth socket column, the elevator car is locked, so that the elevator car is prevented from falling. The invention has low installation and maintenance cost and high safety.
Description
Technical Field
The invention belongs to the field of elevators, and relates to a safety protection device of an elevator, in particular to a falling prevention safety protection device of an elevator car and an elevator using the falling prevention safety protection device.
Background
The elevator is a main transportation means in the existing (high-rise) building, and due to the characteristics of frequent use and more people, the safety of the elevator becomes a factor of primary consideration. The elevator car is dropped to be one of the most dangerous situations in the use of the elevator, so the existing elevator system is designed with more perfect safety protection devices, such as a speed limiter, a safety gear, a car buffer at the bottom of an elevator shaft and the like.
Safety tongs are the most important safety devices in elevator installations, which are safety devices that, under the operation of the governor, bring the car to an emergency stop and hold it on the guide rails when the elevator speed exceeds the limit speed set by the elevator governor (typically 1.15 times the rated speed), or in the event of a rope break and slackening. However, the structure of the safety gear in the existing elevator device is very complex, and the manufacturing, installation and maintenance costs are very high.
Disclosure of Invention
The invention aims to provide an anti-falling safety protection device for an elevator car and an elevator using the device, so that the cost is reduced on the basis of ensuring the use safety of the elevator.
The invention provides a falling-proof safety protection device for an elevator car, which comprises:
the fixed connecting piece is provided with a sliding groove extending longitudinally;
the upper end of the traction connecting piece is connected with the traction rope, and the lower end of the traction connecting piece is fixed in the sliding groove in a sliding manner through a fastening piece penetrating through the sliding groove;
the safety fixing assembly comprises safety fixing clamps located on two sides of the sliding groove and extending outwards, the two sides of the sliding groove are respectively provided with at least one safety fixing clamp, and one end, close to the sliding groove, of each safety fixing clamp is hinged to the fastening piece.
Preferably, the bottom of the fixed connecting piece is provided with a fixing device for mounting the fixed connecting piece to the car.
Preferably, the fixing device is a fixing plate parallel to the plane of the sliding groove.
Preferably, the safety fixing clip is of a needle type or blade type structure, and an end part of the safety fixing clip, which is far away from the fastener, is provided with a clamping part extending downwards.
Preferably, the safety fixing clamps are respectively arranged at each side of the sliding groove, and the two safety fixing clamps positioned at the same side are respectively positioned at the front side and the rear side of the fixed connecting piece. The two sides of the limited safety fixing clip are uniformly distributed, so that the clamping and fixing of the safety fixing clip are facilitated, and the use safety of the elevator is improved.
Preferably, the fastener is a pin.
The invention provides an elevator, which comprises an elevator shaft and a car which moves up and down in the elevator shaft, wherein the top of the car is provided with at least one elevator car anti-falling safety protection device, and the lower end of a fastener of the elevator car anti-falling safety protection device is connected to the car through a resetting device;
the inner walls of two sides of the elevator shaft are respectively provided with locking positioning columns which extend up and down and can be clamped with the safety fixing clamps at different heights;
the resetting device is in a stretching state when the elevator works normally, and the resetting device can pull down the fastening piece when the hauling rope is disconnected and enable the safety fixing clamps at two sides to be opened, so that one end, far away from the fastening piece, of each safety fixing clamp is clamped on the locking positioning column.
Preferably, the locking reference column includes along the vertical projection of elevartor shaft lateral wall upper and lower extension, vertically offers a plurality of draw-in grooves that can with the block of safety fixing card at the one side of vertical projection towards the car, and the car both sides are equipped with the running assembly that can walk in vertical projection both sides. The elevator car can be prevented from swinging left and right in the falling process when being locked.
Preferably, car top both sides are equipped with spacing subassembly respectively, and this spacing subassembly includes:
the upright columns are positioned on two sides of the safety fixing clamp; and
a limiting part arranged between the two upright posts;
when one end of the safety fixing card, which is far away from the fastener, is clamped in the clamping groove, the limiting part is always positioned above the safety fixing card.
The above definition can prevent the safety fixing clips on two sides from spreading an overlarge angle around the fastener or winding upwards.
Preferably, the elevator car fall protection safety protection device housing is provided with a shell.
The working principle of applying the anti-falling safety protection device of the elevator car to the elevator is as follows: when the elevator car normally works, the steel wire traction rope at the upper end of the traction connecting piece is lifted upwards under the action of the gravity of the car to drag the connecting piece, the fastener at the lower end of the traction connecting piece slides upwards to the top of the sliding groove in the sliding groove, the resetting device arranged between the fastener and the car is stretched at the moment, and the safety fixing clamps at two sides are packed up, so that the safety fixing clamps cannot be clamped with the clamping grooves in the locking positioning columns, and the normal operation of the elevator is guaranteed.
When the condition that the steel wire towline of towing the connecting piece upper end breaks or relaxs appears, the towline is whole or partly lose the tension that resists resetting means, and under resetting means's quick contraction action, the safety fixing card of fastener and both sides can be by the pulling downwards of resetting means to make the safety fixing card of spout both sides expand rapidly, when the safety fixing card distal end block during to the draw-in groove on the locking reference column that falls, the car is locked, has avoided falling.
Drawings
FIG. 1 is a schematic view of a fixed connector;
FIG. 2 is a diagram of the normal operation of the anti-falling safety protection device of the elevator car;
FIG. 3 is a side view of FIG. 2;
fig. 4 is a state diagram of the falling protection state of the falling protection safety protection device of the elevator car; (ii) a
Fig. 5 is a schematic view of the installation structure of the anti-falling safety protection device of the elevator car applied to the elevator (in a normal working state);
fig. 6 is a schematic view of the installation structure of the anti-falling safety protection device of the elevator car applied to the elevator (falling protection state);
FIG. 7 is an enlarged view of portion A of FIG. 6;
fig. 8 is a schematic structural view of a car side limiting assembly;
FIG. 9 is a schematic structural view of the locking positioning post;
fig. 10 is a schematic top sectional view of the traveling assembly traveling on the locking positioning post.
The notation in the figure is: 1-fixed connecting piece, 11-sliding groove, 12-fixing device, 2-traction connecting piece, 21-connecting hole, 22-traction rope, 3-safety fixing clip, 31-clamping part, 4-fastening piece, 5-resetting device, 6-car, 61-walking component, 611-mounting seat, 612-roller, 62-upright post, 63-limiting part, 7-locking positioning column, 71-longitudinal convex column, 72-clamping groove, 73-step partition part, 8-elevator shaft and 9-shell.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Example 1:
as shown in fig. 1, 2 and 3, the present embodiment provides a fall prevention safety device for an elevator car, which includes a fixed connector 1, a traction connector 2 and a safety fixing assembly.
Fig. 1 shows a schematic view of a fixed connection 1, which has a longitudinally extending slot 11 in the middle.
The upper end of the traction connecting piece 2 is provided with a connecting hole 21 which is convenient for the connection of a traction rope 22, and the lower end of the traction connecting piece 2 is fixed in the sliding chute 11 in a sliding way through a fastener 4.
Install safe fixed subassembly on fastener 4, it is including being located the outside safe fixing clip 3 that extends in spout 11 both sides, spout 11 both sides are equipped with a safe fixing clip 3 respectively at least, in this embodiment, safe fixing clip 3 is equipped with two respectively in spout 11 every side, and lie in two safe fixing clips 3 of same one side and lie in fixed connection spare 1 front and back both sides respectively, that is to say, it has a pair of safe fixing clip 3 to strut about spout 11 one side of fixed connection spare 1, the opposite side struts a pair of safe fixing clip 3 about equally, safe fixing clip 3 can be the rectangular structure of pin type or blade formula, the one end that safe fixing clip 3 is close to spout 11 articulates on fastener 4, therefore the safe fixing clip 3 of the left and right sides all can strut outwards or draw in through articulated fastener 4.
As shown in fig. 1, in order to improve the connection between the lower end of the fixed link 1 and other components, the present embodiment may be provided with a fixing device 12 for mounting the fixed link 1 to the car 6 at the bottom of the fixed link 1.
The fixing manner of the fixed connecting piece 1 and the car 6 is various, so that different fixing devices 12 can be selected, for example, the fixing device 12 is a horizontal plate of the vertical sliding chute 11, so that the fixing device 12 can be fixed on the top of the car 6; or the fixing device 12 is a fixing plate parallel to the plane of the sliding groove 11, so that the fixing device 12 can be fixed on the side walls of the car 6.
The end of the safety fixing clip 3 away from the fastener 4 is provided with a downwardly extending engaging part 31, which can improve the locking effect of protecting the elevator.
The fastening member 4 may be selected as a pin passing through the sliding groove 11, and both the traction coupling member 2 and the safety fixing clip 3 may rotate around the pin.
Of course, the above-mentioned manufacturers or vendors of elevator car fall-prevention safety protection devices can be manufactured or sold separately.
Example 2:
the technical solution of this embodiment can be formed by applying the elevator car fall-prevention safety protection device in embodiment 1 to a specific elevator, and specifically, as shown in fig. 5, a schematic diagram of the safety protection device in the normal operation process of the elevator is shown.
The elevator comprises an elevator shaft 8 and a car 6 which moves up and down in the elevator shaft 8, wherein a proper number of elevator car anti-falling safety protection devices can be arranged at the top of the car 6 according to the situation, and the embodiment is only explained for the situation that one elevator car is installed.
The hoisting ropes 22 are normally connected to the upper ends of the hoisting attachments 2 first, and the safety device is mounted to the top of the car 6 by the lower ends of the fixed attachments 1 through the fixing devices 12 (if there is no fixing device 12, the fixed attachments 1 and the car 6 are connected by separate fixed connection devices, and then a restoring device 5 capable of connecting the fastening device 4 to the car 6 is mounted by the fastening device 4.
As shown in fig. 9 and 10, the inner walls of the elevator shaft 8 on both sides are provided with locking positioning posts 7 extending vertically and engageable with the safety fixing clips 3 at different heights.
Specifically, the locking positioning column 7 includes a longitudinal convex column 71 extending up and down along the sidewall of the elevator shaft 8, and the longitudinal convex column 71 may be in a vertical rectangular parallelepiped shape or may have a dovetail groove shape in cross section. One surface of the longitudinal convex column (71) facing the car 6 is longitudinally provided with a plurality of clamping grooves 72 which can be clamped with the safety fixing clip 3, the clamping grooves 72 are uniformly distributed, and adjacent clamping grooves 72 are separated by a step partition part 73.
When the elevator normally runs, the resetting device 5 is always in a proper stretching state, and then the safety fixing clamps 3 on the two sides are unfolded to keep the position unchanged.
In this state, the distal end of the safety fixing clip 3 does not contact the lock positioning post 7.
As shown in fig. 6 and 7, in case that the steel wire hoisting rope 22 at the upper end of the hoisting connection member 2 is broken or loosened, the hoisting rope 22 loses tension acting on the reset device 5 completely or partially, the fastening member 4 and the safety fixing clips 3 at both sides can be pulled downward by the reset device 5 under the rapid contraction action of the reset device 5, so that the safety fixing clips 3 at both sides of the chute 11 are rapidly unfolded under the action of the top of the elevator car 6, thereby increasing the distance between the safety fixing clips 3 at both sides, and when the distance between the safety fixing clips 3 at both sides is increased to the distance of the inner walls of the elevator shafts 8 at both sides, the engaging part 31 of the safety fixing clip 3 is engaged in the engaging groove 72, thereby locking the elevator car 6 to be dropped.
It should be noted that the both side step partitions 73 must have sufficient pressure-bearing capacity to bear the weight of the car 6 and the passenger (the total weight of the car 6 at the upper limit of the ride).
As shown in fig. 5 and 10, in order to guide the car 6 to stably run in the elevator shaft 8, the traveling assemblies 61 capable of traveling on the longitudinal studs 71 are provided on both sides of the car 6 in the present embodiment, and the traveling assemblies 61 in the present embodiment adopt the structure shown in fig. 10.
Specifically, each traveling assembly 61 comprises a U-shaped mounting seat 611 and rollers 612, each traveling assembly 61 has two rollers 621 which are respectively located at two sides of the mounting seat 611, and the rollers at two sides of the mounting seat 611 can be located at two sides of the longitudinal protruding pillar 71 and travel on the inner wall of the elevator shaft 8 (and can also travel on two sides of the longitudinal protruding pillar 71), so that the car 6 cannot swing left and right when being locked in the falling process.
If the running stability of the roller 612 is further improved without considering the cost, not only the upper running component 61 and the lower running component 61 can be respectively arranged on the two sides of the car 6, but also a track matched with the roller 612 can be arranged on the inner wall of the elevator shaft 8 on the two sides or two sides of the longitudinal convex column 71.
As shown in fig. 6-8, considering that the safety fixing clip 3 is not stably engaged with the engaging groove 72 when the car 6 is locked, it is preferable that a limiting component matching with the safety fixing clip 3 is respectively disposed on both sides of the top of the car, the limiting component includes an upright column 62 and a limiting part 63, wherein the upright column 62 is disposed on the upright column 62 on both sides of the safety fixing clip 3, and the limiting part 63 can be fixed between the two upright columns 62 by a limiting pin. When elevator normal operating or block locking, spacing portion 63 must be located safety fixing clip 3 top all the time, prevents that it from continuing to strut too big angle and leading to reducing safety fixing clip 3's locking effect, has also avoided the safety fixing clip 3 of both sides to wind around fastener 4 to the top simultaneously, loses and goes the locking effect.
It should be noted that, since the safety fixing clips 3 on both sides can be engaged with the engaging grooves 72 when expanded, the length of the safety fixing clip 3 must satisfy: when the safety fixing clips 3 on both sides are horizontally spread to 180 degrees, the distance between both sides must be greater than the distance between the clipping grooves 72 on both sides (equivalent to the distance between the elevator shafts 8 on both sides), so that the clipping portion 31 can be clipped into the clipping groove 72 when the safety fixing clips 3 on both sides are spread.
Consider the following case: if the safety fixing clips 3 on both sides are horizontally expanded to 180 degrees, the distance between both sides is smaller than the distance between the clamping grooves 72 on both sides, so that the safety fixing clips 3 cannot be clamped into the clamping grooves 72, and the safety protection device cannot play a role in safety protection of the elevator.
It is known that, if the angle of the two sides of the safety fixing clip 3 is expanded is larger, the strength of the safety fixing clip is reduced, and therefore, when the length of the safety fixing clip 3 is designed, it needs to be considered that when the safety fixing clip 3 is clamped into the clamping groove 72, the angle of the expansion between the safety fixing clips 3 on the two sides needs to be controlled within a reasonable range, for example, the angle of the expansion cannot exceed 150 degrees when the safety fixing clips 3 on the two sides are clamped into the clamping groove 72.
In order to protect the anti-falling safety protection device of the elevator car and prolong the service life of the anti-falling safety protection device of the elevator car, a shell 9 (a dotted line frame in fig. 5 and 6) is arranged on the outer cover of the anti-falling safety protection device of the elevator car, vertical seams (not shown in the figure) allowing the safety fixing clips 3 to move up and down are arranged on two sides of the shell 9, and therefore the anti-falling safety protection device can be prevented from being corroded by rainwater and dust to a certain extent.
It should be particularly understood that, because the reset device 5 is always in a stretching state in normal operation, and because the reset device 5 does not belong to a frequently used component, when the car 6 is in a falling accident, the stretched reset device 5 is required to be rapidly restored to an initial position at this time, so that the safety fixing clip 3 is rapidly clamped in the clamping groove 72, and therefore, the reset device 5 can select a tension spring or a spring with certain memory to prevent the tension spring or the spring from losing the restoring force under the stretching effect for a long time.
Of course, when the elevator is maintained or repaired, the resetting device 5 also needs to be periodically detected or replaced, and the restoring performance of the resetting device 5 is ensured to meet the protection requirement.
Finally, it should be added that, in embodiment 2, only one elevator car falling prevention safety protection device is applied to the elevator car 6, a plurality of groups of elevator car falling prevention safety protection devices can be further arranged according to the level of the requirement on safety, the safety fixing clips 3 on both sides of each group of safety protection device are correspondingly provided with the locking positioning columns 7 or share one locking positioning column 7, and when one locking positioning column 7 is shared, the clamping groove 72 needs to have enough width to clamp the plurality of groups of safety fixing clips 3.
The anti-falling safety protection device for the elevator car and the elevator are described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the methods of the present application and their core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. An elevator car prevents safety arrangement that falls, its characterized in that includes:
a fixed connecting piece (1) with a longitudinally extending sliding groove (11);
the upper end of the traction connecting piece (2) is connected with the traction rope (22), and the lower end of the traction connecting piece (2) is fixed in the sliding groove (11) in a sliding way through a fastener (4) penetrating through the sliding groove (11);
the safety fixing assembly comprises safety fixing clamps (3) located on two sides of a sliding groove (11) and extending outwards, wherein the two sides of the sliding groove (11) are respectively provided with at least one safety fixing clamp (3), and one end, close to the sliding groove (11), of each safety fixing clamp (3) is hinged to a fastener (4).
2. An elevator car fall protection safety device as claimed in claim 1, wherein the fixed connection member (1) is provided at its bottom with a fixing means (12) for mounting the fixed connection member (1) to the car (6).
3. A fall protection safety device for elevator cars, as claimed in claim 2, characterized in that said fixing means (12) are fixing plates parallel to the plane of the chute (11).
4. An elevator car fall protection safety device as claimed in claim 1, characterized in that the safety catch (3) is of pin or blade type and the end of the safety catch (3) remote from the fastening member (4) is provided with a downwardly extending catch (31).
5. An elevator car fall protection safety device as claimed in claim 4, wherein the safety fixing clips (3) are provided two on each side of the chute (11), and the two safety fixing clips (3) on the same side are respectively arranged on the front side and the rear side of the fixed connecting member (1).
6. An elevator car fall protection safety device as claimed in claim 1, wherein the fastener (4) is a pin.
7. Elevator, comprising an elevator hoistway (8) and a car (6) that moves up and down within the elevator hoistway (8), characterized in that:
the top of the car (6) is provided with at least one elevator car anti-falling safety protection device as claimed in any one of claims 1-6, the lower end of the fastening piece (4) of the elevator car anti-falling safety protection device is connected to the car (6) through a resetting device (5);
the inner walls of two sides of the elevator shaft (8) are respectively provided with locking positioning columns (7) which extend up and down and can be clamped with the safety fixing clamps (3) at different heights;
the resetting device (5) is in a stretching state when the elevator works normally, and the resetting device (5) can pull down the fastening piece (4) when the hauling rope (22) is disconnected and enable the safety fixing clamps (3) on the two sides to be opened, so that one ends, far away from the fastening piece (4), of the safety fixing clamps (3) are clamped on the locking positioning columns (7).
8. The elevator as claimed in claim 7, wherein the locking and positioning column (7) comprises a longitudinal convex column (71) extending up and down along the sidewall of the elevator shaft (8), a plurality of slots (72) capable of being engaged with the safety fixing clip (3) are longitudinally formed on one surface of the longitudinal convex column (71) facing the elevator car (6), and traveling assemblies (61) capable of traveling on two sides of the longitudinal convex column (71) are arranged on two sides of the elevator car (6).
9. Elevator according to claim 8, characterized in that the car (6) is provided with stop assemblies on both sides of its top, which stop assemblies comprise:
the upright posts (62) are positioned at two sides of the safety fixing clip (3); and
a limiting part (63) arranged between the two upright columns (62);
when one end, far away from the fastening piece (4), of the safety fixing card (3) is clamped into the clamping groove (72), the limiting part (63) is located above the safety fixing card (3) all the time.
10. An elevator according to claim 9, characterized in that the elevator car fall protection safety device housing is provided with a casing (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111255870.XA CN113928952A (en) | 2021-10-27 | 2021-10-27 | Anti-falling safety protection device for elevator car and elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111255870.XA CN113928952A (en) | 2021-10-27 | 2021-10-27 | Anti-falling safety protection device for elevator car and elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113928952A true CN113928952A (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111255870.XA Pending CN113928952A (en) | 2021-10-27 | 2021-10-27 | Anti-falling safety protection device for elevator car and elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113928952A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107235399A (en) * | 2017-06-09 | 2017-10-10 | 北京九州大地生物技术集团股份有限公司 | A kind of fall arrest hanging basket |
| CN208166318U (en) * | 2018-05-02 | 2018-11-30 | 西安特种设备检验检测院 | A kind of elevator anti-fall device |
| CN210193121U (en) * | 2019-04-22 | 2020-03-27 | 浙江德睿电梯部件科技有限公司 | Safety device for preventing elevator from falling rapidly |
| CN213326216U (en) * | 2020-07-17 | 2021-06-01 | 洛阳洛信矿山机器有限公司 | Mine hoisting wire rope safety device |
-
2021
- 2021-10-27 CN CN202111255870.XA patent/CN113928952A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107235399A (en) * | 2017-06-09 | 2017-10-10 | 北京九州大地生物技术集团股份有限公司 | A kind of fall arrest hanging basket |
| CN208166318U (en) * | 2018-05-02 | 2018-11-30 | 西安特种设备检验检测院 | A kind of elevator anti-fall device |
| CN210193121U (en) * | 2019-04-22 | 2020-03-27 | 浙江德睿电梯部件科技有限公司 | Safety device for preventing elevator from falling rapidly |
| CN213326216U (en) * | 2020-07-17 | 2021-06-01 | 洛阳洛信矿山机器有限公司 | Mine hoisting wire rope safety device |
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