CN210438237U - Lifting device with lifting force - Google Patents
Lifting device with lifting force Download PDFInfo
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- CN210438237U CN210438237U CN201920505115.4U CN201920505115U CN210438237U CN 210438237 U CN210438237 U CN 210438237U CN 201920505115 U CN201920505115 U CN 201920505115U CN 210438237 U CN210438237 U CN 210438237U
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- lifting
- lifting force
- guide rail
- limiting
- elevator
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Abstract
The utility model belongs to the technical field of elevator safety, concretely relates to lifting device with lifting force, including lifting force mechanism and lifting mechanism, lifting force mechanism is connected with lifting mechanism, lifting force mechanism is used for contacting friction with elevator guide rail to produce lifting force, thereby linkage lifting mechanism; the lifting mechanism is used for triggering the braking device. The lifting device with the lifting force generates the lifting force by the contact friction of the lifting force mechanism and the elevator guide rail, the speed limiter is not needed, and the requirement on the speed limiter is low; and the speed measurement and the generation of the lifting force are separated, so that the speed measurement and the generated lifting force are more stable and controllable.
Description
Technical Field
The utility model belongs to the technical field of elevator safety, concretely relates to pulling force's draw gear is carried in area.
Background
The safety protection of the elevator system is realized by a safety protection device, is emergency protection after the elevator breaks down, can detect the fault state, can enable the elevator car to be in a safe state by emergency braking, and prevents personnel injury and equipment damage. For example, descending overspeed or falling is realized by adopting a mechanical speed limiter, a lifting linkage mechanism and a safety gear, and the lifting force for lifting the safety gear is provided by the mechanical speed limiter.
In addition, the conventional speed governor measures a speed and generates a pulling force, and the pulling linkage mechanism is only used as a linkage or transmission mechanism. For the existing speed limiter, the speed is measured and lifting force is generated; for the safety of the elevator, the speed measurement is required to be stable, and the generated pulling force is required to be stable and controllable; if the lifting force is too large, the lifting linkage mechanism is easy to break, and if the lifting force is too small, the safety tongs cannot be reliably lifted and braked, so that the safety tongs are invalid, and further the safety protection of the elevator is invalid. In addition, the existing speed limiter is generally installed in an elevator machine room, the safety tongs are lifted through the transmission of a steel wire rope, the transmission distance of the lifting force is long, the controllability is poor, and safety risks are increased to different degrees.
SUMMERY OF THE UTILITY MODEL
Based on one or more of the above-mentioned not enough that exist among the prior art, the utility model provides a tensile draw gear is carried in area.
In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme:
a lifting device with lifting force comprises a lifting force mechanism and a lifting mechanism, wherein the lifting force mechanism is connected with the lifting mechanism and is used for being in contact friction with an elevator guide rail to generate the lifting force, so that the lifting mechanism is linked; the lifting mechanism is used for triggering the braking device.
Preferably, the driving mode of the contact friction of the lifting force mechanism and the elevator guide rail comprises one or more of mechanical driving, magnetic driving, electric driving, hydraulic driving and air driving.
Preferably, the lifting and pulling mechanism comprises a base body, the base body is provided with a guide rail groove which is longitudinally arranged, the elevator guide rail penetrates through the guide rail groove, one side of the guide rail groove is provided with a wedge block connected with the base body, and the other side of the guide rail groove is provided with a leaning piece movably connected with the base body; when the abutting piece moves to be in contact with the elevator guide rail, the abutting piece and the elevator guide rail rub to generate a lifting force.
Preferably, the seat body is provided with a slide way, and the abutting piece is movably matched with the slide way.
Preferably, the slide way comprises an upper slide way and a lower slide way which are communicated, and the upper slide way and the lower slide way both take the communication position of the upper slide way and the lower slide way as a starting point, extend towards the direction of the guide rail groove and extend towards two sides.
As a preferred scheme, the pulling force lifting mechanism further comprises a limiting mechanism, the limiting mechanism comprises a limiting column, a sliding sleeve and two limiting elastic pieces, the sliding sleeve is sleeved outside the limiting column, the sliding sleeve is connected with a base body of the pulling force lifting mechanism, and the limiting column is fixed on the elevator car; the two limiting elastic pieces are respectively positioned on two sides of the sliding sleeve and are both limited on the limiting columns.
Compared with the prior art, the utility model, beneficial effect is:
the lifting device with the lifting force generates the lifting force by the contact friction of the lifting force mechanism and the elevator guide rail, the speed limiter is not needed, and the requirement on the speed limiter is low; the speed measurement and the lifting force are separated, so that the speed measurement and the generated lifting force are more stable and controllable;
the utility model discloses a tensile pulling force's pulling device can also and realize two-way friction between the elevator guide rail is carried in the area.
Drawings
Fig. 1 is a schematic structural diagram of a lifting device with a lifting force according to a first embodiment of the present invention applied to an elevator car-based safety system;
fig. 2 is a schematic structural diagram of a lifting device with a lifting force according to a first embodiment of the present invention applied to the other side of an elevator car-based safety system;
fig. 3 is a schematic structural diagram of a lifting device with a lifting force according to a first embodiment of the present invention applied to a detection trigger device of an elevator car-based safety system;
fig. 4 is a schematic structural diagram of a lifting device with a lifting force according to a first embodiment of the present invention applied to the other side of a detection trigger device of an elevator car-based safety system;
fig. 5 is a schematic structural diagram of a lifting device with a lifting force according to a first embodiment of the present invention applied to the other side of a detection trigger device of an elevator car-based safety system;
fig. 6 is a schematic structural diagram of a lifting device with a lifting force according to a first embodiment of the present invention applied to the other side of a detection trigger device of an elevator car-based safety system;
FIG. 7 is a cross-sectional view of section E-E of FIG. 6;
fig. 8 is a schematic structural view of a detecting and triggering device and a lifting device with a lifting force according to a first embodiment of the present invention;
fig. 9 is a schematic structural view of a lifting force mechanism of a lifting device with a lifting force according to a first embodiment of the present invention;
fig. 10 is a schematic structural view of the other side of the lifting force mechanism of the lifting device with lifting force according to the first embodiment of the present invention;
FIG. 11 is a cross-sectional view of section F-F of FIG. 10;
fig. 12 is a schematic structural view of a lifting mechanism and a braking device of a lifting device with a lifting force according to a first embodiment of the present invention;
fig. 13 is a partially enlarged structural schematic view of a lifting mechanism and a braking device of a lifting device with a lifting force according to a first embodiment of the present invention;
fig. 14 is a partially enlarged schematic structural view of a lifting mechanism of a lifting device with a lifting force according to a first embodiment of the present invention;
fig. 15 is a schematic structural view of the other side of the lifting mechanism and the braking device of the lifting device with lifting force according to the first embodiment of the present invention;
fig. 16 is a schematic structural view of a lifting mechanism and a detection trigger device of a lifting device with a lifting force according to a third embodiment of the present invention;
fig. 17 is a schematic structural view of the lifting mechanism of the lifting device with lifting force and the detection trigger device according to the third embodiment of the present invention at another viewing angle.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
The first embodiment is as follows:
as shown in fig. 1 and 2, the pulling device with pulling force of the present embodiment is applied to an elevator car-based safety system including a detection triggering device a, a pulling device B with pulling force, and a braking device C, all of which are mounted on an elevator car.
The detection trigger device A is used for being in contact with the elevator guide rail I, the detection trigger device A is convenient to detect the running state of the elevator car accurately, and the detection trigger device A is also used for triggering the lifting device B with the lifting force when the running state of the elevator car is in a fault state. Specifically, as shown in fig. 3-6, the detection trigger device a comprises a detector 1 and a trigger mechanism 2, wherein the detector 1 is used for detecting the running state of the elevator car and driving the trigger mechanism when the elevator car is in a fault state; the detector 1 of this embodiment is a mechanical detector, i.e., a speed limiter, so the operating state of the elevator car detected by the detector of this embodiment is the operating speed of the elevator car, and then the fault state of the elevator car of this embodiment is a fault state that can be fed back by speed, such as overspeed, falling, or unexpected movement, for example, the fault state of overspeed is that the operating speed of the elevator car exceeds 115% of the rated speed of the elevator, and the fault state of falling, unexpected movement can be fed back by abnormality of the operating speed. As shown in fig. 5, the detector 1 is located on a roller 11, and the roller 11 is used for contacting with the elevator guide rail I, so that the running state of the elevator car detected by the detector is more accurate by the contact.
When the detector 1 detects that the running state of the elevator car belongs to a fault state, the speed governor acts and is linked with the trigger mechanism 2. As shown in fig. 3, the triggering mechanism 2 includes a driving member 21, a rotating shaft 22 and a linkage rod 23, wherein the driving member 21 is used for being triggered by the speed limiter to move; the cross section of the rotating shaft 22 is square, correspondingly, the driving member 21 is provided with a square hole matched with the cross section structure of the rotating shaft 22, and when the driving member 21 is installed on the rotating shaft 22, the rotating shaft 22 can be linked with the driving member 21; the linkage rod 23 is provided with a square hole matched with the cross-sectional structure of the rotating shaft 22, and when the linkage rod 23 is installed on the rotating shaft 22, the linkage rod 23 can be linked with the rotating shaft 22. Moreover, the rotating surface of the driving piece 21 rotating around the rotating shaft 22 is parallel to the rotating surface of the linkage rod 23 rotating around the rotating shaft 22; as shown in fig. 7, the linkage rod 23 is of a component design, and includes a rod 231, a sleeve 232 and a connecting rod 233, the sleeve 232 is sleeved outside the rod 231, and the two are matched with each other by a compression spring 234, the rod 231 is mounted on the rotating shaft 22 through a base, so that the rod 231 is linked with the rotating shaft 22; the connecting structure between the connecting rod 233 and the sleeve 232 is a concave-convex matching structure, and the connecting rod 233 abuts against the rod body 231, so that the rod body 231 can be linked with the connecting rod 233 to move when moving.
In addition, in order to facilitate the resetting of the triggering mechanism, as shown in fig. 4 and 5, the triggering mechanism of the present embodiment further includes a resetting assembly 24, the resetting assembly 24 includes a second rotating disc 241, a second mounting plate 242, a third movable plate 243, a fourth movable plate 244, a second guiding column 245 and a second resetting elastic member 246, the second rotating disc 241 is linked with the rotating shaft 22, the second mounting plate 242 is fixed to the elevator car through a mounting bracket a, and the second rotating disc 241 is rotatably fitted to the mounting bracket a; specifically, an annular groove is formed in the outer wall of the second rotating disc 241, correspondingly, a round hole is formed in the mounting frame a, and the round hole of the mounting frame is assembled in the annular groove of the second rotating disc, so that the second rotating disc can be rotatably matched with the mounting frame. The second mounting plate 242 is used for mounting the third movable plate 243 and the fourth mounting plate 244, and the mounting manner may be a joggle joint, so that the third movable plate 243 and the fourth mounting plate 244 are respectively located at two sides of the second rotating disc 241; more specifically, four reset bolts 2410 are arranged on the rotating surface of the second rotating disk 241, the four reset bolts 2410 are distributed in a square shape, and the third movable plate 243 and the fourth mounting plate 244 are distributed on two sides of the four reset bolts 2410, so that when the second rotating disk 241 rotates, the four reset bolts 2410 on the second rotating disk 241 can be linked with the third movable plate 243 and the fourth movable plate 244 to move. The second guiding column 245 is installed between the third movable plate 243 and the fourth movable plate 244, and extends to the outside of the fourth movable plate 244 to form a second extending section, and the second elastic resetting member 246 is sleeved on the second extending section of the second guiding column 245 and is limited by a nut; when the second rotating disc 241 rotates, the four reset bolts on the second rotating disc 241 can link the third movable plate 243 and the fourth movable plate 244 to move, so that the fourth movable plate 244 compresses the second reset elastic member 246, and the second reset elastic member 246 is in a compressed state, thereby facilitating the reset of the trigger mechanism. The second guiding column 245 is a long bolt, and penetrates through the third movable plate 243 and the fourth movable plate 244; the second return elastic member 246 is a return spring or other elastic component.
The lifting device B with a lifting force is used for generating the lifting force by contacting and rubbing with the elevator guide rail when being triggered and triggering the braking device C; specifically, as shown in fig. 8, the lifting device B with a lifting force comprises a lifting force mechanism 3 and a lifting force mechanism 4, the lifting force mechanism 3 is connected with the lifting force mechanism 4, and when the lifting force mechanism 3 is triggered, the lifting force mechanism is in contact friction with the elevator guide rail to generate the lifting force, so that the lifting force mechanism is linked to trigger the braking device. As shown in fig. 9, the structure of the lifting force mechanism 3 is the same as that of a safety tongs, and includes a seat body 31, the seat body 31 has a longitudinally-arranged guide rail groove 310, an elevator guide rail I penetrates through the guide rail groove 310, one side of the guide rail groove is provided with a wedge 32 connected with the seat body 31, and the surface of the wedge 32 is provided with a friction plate; the other side of the guide rail groove is provided with an abutting piece 33 movably connected with the seat body 31. Specifically, the seat body 31 has a slide way adapted to the abutting piece 33, so that the abutting piece 33 can be movably fitted to the slide way, the slide way includes an upper slide way 3110 and a lower slide way 3111 which are communicated, the upper slide way 3110 and the lower slide way 3111 both use the communication position of the two as a starting point, extend towards the direction of the guide rail groove and to both sides, so that the abutting piece 33 can be in clearance fit with the elevator guide rail to be in contact fit along the upper slide way 3110 or the lower slide way 3111, so that the abutting piece 33 is in contact friction with the elevator guide rail I to generate a lifting force, and bidirectional triggering can be realized. As shown in fig. 11 and 12, the abutting part 33 is connected to the link 233 of the linkage rod through a limit pin shaft 235, a spacer 236 and a screw 237, so that the linkage rod 23 can move along the upper sliding track 3110 or the lower sliding track 3111 in a linkage manner along the abutting part 33. In addition, the abutting member 33 of the present embodiment is a roller.
In addition, the pulling force mechanism 3 of this embodiment further includes a limiting mechanism, as shown in fig. 9 and 10, the limiting mechanism includes a limiting column 34, an upper sliding sleeve 35, a lower sliding sleeve 36, an upper limiting elastic piece 37 and a lower limiting elastic piece 38, which are sleeved outside the limiting column 34, the upper sliding sleeve 35 and the lower sliding sleeve 36 are distributed vertically and are fixedly connected with the base body 31 of the pulling force mechanism, the limiting column 34 penetrates through the upper sliding sleeve 35 and the lower sliding sleeve 36, the upper end of the limiting column 34 is sleeved with the upper limiting elastic piece 37 and is limited by a nut, so that the upper end and the lower end of the upper limiting elastic piece 37 are distributed and limited between the upper sliding sleeve 35 and the upper nut; the lower end of the limiting column 34 is sleeved with a lower limiting elastic part 38 and is limited by a lower nut, so that the upper end and the lower end of the lower limiting elastic part 38 are distributed and limited between the lower sliding sleeve 36 and the lower nut. The lower end of the limit column 34 is fixed on the elevator car through a fixing bracket. When the abutting part 33 of the lifting force mechanism is in contact friction with the elevator guide rail, the movement of the seat body 31 of the lifting force mechanism is limited by the upper limiting elastic part 37 and the lower limiting elastic part 38, and the buffer effect can be realized. The upper limiting elastic member 37 and the lower limiting elastic member 38 of this embodiment are both limiting springs or other elastic components.
As shown in fig. 12, the lifting mechanism 4 of the present embodiment includes a lifting rod 41 and a linkage assembly 42, wherein the lifting rod 41 is a right-angle structure formed by connecting a plurality of connecting rods in sequence, so as to avoid the structure of the elevator car; the upper end of the lifting rod 41 is connected with the seat body 31 of the lifting force mechanism to realize linkage to transmit the lifting force, the lower end of the lifting rod 41 is linked with the linkage component 42, and the linkage component 42 is linked with the brake device C to trigger the brake device C. Specifically, as shown in fig. 13, the linkage assembly 42 includes a rotating shaft 421 and a trigger plate 422, the rotating shaft 421 is a square tube structure, the rotating shaft 421 is connected to the lower end of the lifting rod 41 through a lifting plate 423, so that the rotating shaft 421 is linked to the lifting rod 41, the trigger plate 422 is linked to the rotating shaft 421, and the trigger plate 422 is linked to the brake device C to trigger the brake device C.
In addition, in order to reset the lifting mechanism, the linkage assembly 42 further includes a reset unit for resetting the rotating shaft. Specifically, as shown in fig. 13 and 14, the restoring unit includes a first rotary disk 424, a first mounting plate 425, a first movable plate 426, a second movable plate 427, a first guide column 428, and a first restoring elastic member 429, the first rotary disk 424 is linked to the rotary shaft 421, the first mounting plate 425 is fixed to the elevator car by a mounting bracket b, and the first rotary disk 424 is rotatably fitted to the mounting bracket b; specifically, an annular groove is formed in the outer wall of the first rotating disk 424, correspondingly, a round hole is formed in the mounting bracket b, and the round hole of the mounting bracket is assembled in the annular groove of the first rotating disk, so that the first rotating disk can be rotationally matched with the mounting bracket. The first mounting plate 425 is used for mounting the first movable plate 426 and the second mounting plate 427, and the mounting manner may be a joggle joint, so that the first movable plate and the second mounting plate are respectively located at two sides of the first rotary disc; more specifically, the rotating surface of the first rotating disk 424 is provided with four reset bolts 4240, the four reset bolts are distributed in a square shape, and the first movable plate and the second mounting plate are distributed on two sides of the four reset bolts 4240, so that when the first rotating disk 424 rotates, the four reset bolts 4240 on the first rotating disk 424 can be linked with the first movable plate and the second movable plate to move. The first guiding column 428 is installed between the first movable plate and the second movable plate, and extends to the outside of the second movable plate to form a first extending section, and the first elastic return member 429 is sleeved on the first extending section of the first guiding column 428 and is limited by a nut; when first rotary disk rotated, four reset bolts on the first rotary disk can link first fly leaf, the activity of second fly leaf to make the first elastic component 429 that resets of second fly leaf compression, make first elastic component 429 that resets be in compression state, be convenient for carry the reseing of carrying the mechanism. The first guide column is a long bolt and penetrates through the first movable plate and the second movable plate; the first return elastic element is a return spring or other elastic parts.
As shown in fig. 15, the number of the linkage assemblies 42 in this embodiment is two, each linkage assembly is linked with one braking device C, and the rotating shafts of the two linkage assemblies are connected to realize synchronous rotation, so as to realize stable braking of the elevator car. Wherein, the rotating shaft of only one linkage assembly is connected with the lifting rod through the lifting plate, and the rotating shaft of the other linkage assembly is synchronously linked through the rotating shaft of the linkage assembly connected with the lifting rod.
The braking device of the embodiment is used for braking the elevator car when triggered, and comprises a braking device which clamps the elevator guide rails to generate braking force, such as a one-way safety gear or a two-way safety gear, and can also be other rail clamping braking devices or other emergency protection devices. The specific structure of the braking device of this embodiment is the same as the specific structure of the lifting and pulling mechanism (not including the limiting mechanism), and is not described herein again.
The lifting device with the lifting force can realize the reset of the braking device through the reverse running of the elevator car, so that the lifting device is linked to reset.
The lifting device with the lifting force generates the lifting force by the contact friction of the lifting force mechanism and the elevator guide rail, the speed limiter is not needed, and the requirement on the speed limiter is low.
Example two:
the lifting device with lifting force of the embodiment is different from the first embodiment in that:
the driving mode of the abutting piece is changed from the mechanical driving mode of the first embodiment into magnetic driving or electric driving; specifically, an electromagnet is arranged relative to the abutting piece, and the mutual acting force between the abutting piece and the electromagnet is realized by switching on or off the electromagnet, so that the abutting piece moves to be in contact with the elevator guide rail along a slide way (the slide way is arranged only in the direction opposite to the elevator guide rail); wherein, the frictional force that leans on piece and elevator guide rail contact can be adjusted through the circular telegram electric current of adjusting the electro-magnet, and is convenient and reliable. In addition, mechanical drive, magnetic drive, electric drive, hydraulic drive and pneumatic drive can be freely combined, and the abutting piece can move to be in contact with the elevator guide rail to generate lifting force.
Other structures can refer to the first embodiment.
Example three:
the lifting device with lifting force of the embodiment is different from the first embodiment in that:
as shown in fig. 16 and 17, the detector of the present embodiment includes a mechanical detector 100 and an electronic detector 200, i.e., a mechanical speed limiter and an electronic speed limiter, the mechanical detector 100 and the electronic detector 200 are respectively located at two sides of the elevator guide rail, and rollers of the mechanical detector 100 and the electronic detector 200 have a certain pre-tightening force to contact with the elevator guide rail and always clamp the elevator guide rail; the mechanical detector is used for detecting the speed and the displacement of the elevator car, and the electronic detector is used for detecting the speed, the displacement, the acceleration and deceleration, the stroke, the vibration and the like of the elevator car. The driving member of the mechanical detector is linked with the driving member of the electronic detector, and the same linkage rod is used to link the pulling force lifting mechanism, so that the pulling force lifting mechanism 300 of the embodiment is also improved, and of course, the pulling force lifting mechanism of the first embodiment may also be used.
The pulling force mechanism 300 of this embodiment includes pedestal, U type leaf spring and two sets of spacing subassemblies, and the pedestal is located the middle part of U type leaf spring, and installs in U type leaf spring through four guide pillars of pedestal both sides, and buffer spring 310 is established to the guide pillar overcoat for carry on spacingly and cushion the activity of pedestal. Two sets of limiting assemblies are respectively fixed on two sides of the U-shaped plate spring, and the fixing mode refers to the first embodiment; the seat body is provided with a guide rail groove which is longitudinally arranged, the elevator guide rail penetrates through the guide rail groove, one side of the guide rail groove is provided with a wedge block connected with the seat body, and the other side of the guide rail groove is provided with a leaning piece movably connected with the seat body; when the state of the elevator car is in a fault state, the linkage rod linkage abutting piece moves to be in contact with the elevator guide rail. The structure diversification of the pulling force mechanism is realized.
Other structures can refer to the first embodiment.
The foregoing has been a detailed description of the preferred embodiments and principles of the present invention, and it will be apparent to those skilled in the art that variations may be made in the specific embodiments based on the concepts of the present invention, and such variations are considered as within the scope of the present invention.
Claims (6)
1. The lifting device with the lifting force is characterized by comprising a lifting force mechanism and a lifting mechanism, wherein the lifting force mechanism is connected with the lifting mechanism and is used for generating the lifting force by contacting and rubbing with an elevator guide rail so as to link the lifting mechanism; the lifting mechanism is used for triggering the braking device.
2. The lifting device with the lifting force according to claim 1, wherein the driving mode of the lifting force mechanism in contact friction with the elevator guide rail comprises one or more of mechanical driving, magnetic driving, electric driving, hydraulic driving and pneumatic driving.
3. The lifting device with the lifting force according to claim 1, wherein the lifting force mechanism comprises a base body, the base body is provided with a longitudinally arranged guide rail groove, the elevator guide rail penetrates through the guide rail groove, one side of the guide rail groove is provided with a wedge block connected with the base body, and the other side of the guide rail groove is provided with a leaning piece movably connected with the base body; when the abutting piece moves to be in contact with the elevator guide rail, the abutting piece and the elevator guide rail rub to generate a lifting force.
4. A pulling apparatus with a pulling force according to claim 3, wherein the base body has a slideway, and the abutting member is movably fitted to the slideway.
5. The lifting device with the lifting force according to claim 4, wherein the slideway comprises an upper slideway and a lower slideway which are communicated, and the upper slideway and the lower slideway both take the communication position of the upper slideway and the lower slideway as a starting point and extend towards the direction of the guide rail groove and towards two sides.
6. The lifting device with the lifting force as recited in claim 3, wherein the lifting force mechanism further comprises a limiting mechanism, the limiting mechanism comprises a limiting post, a sliding sleeve sleeved outside the limiting post and two limiting elastic members, the sliding sleeve is connected with a base body of the lifting force mechanism, and the limiting post is fixed on the elevator car; the two limiting elastic pieces are respectively positioned on two sides of the sliding sleeve and are both limited on the limiting columns.
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| CN201920505115.4U CN210438237U (en) | 2019-04-15 | 2019-04-15 | Lifting device with lifting force |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920505115.4U CN210438237U (en) | 2019-04-15 | 2019-04-15 | Lifting device with lifting force |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020211664A1 (en) * | 2019-04-15 | 2020-10-22 | 杭州沪宁电梯部件股份有限公司 | Emergency protection system for elevator car safety |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020211664A1 (en) * | 2019-04-15 | 2020-10-22 | 杭州沪宁电梯部件股份有限公司 | Emergency protection system for elevator car safety |
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