CN212450162U - Mechanical speed limiting protection device for elevator - Google Patents
Mechanical speed limiting protection device for elevator Download PDFInfo
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- CN212450162U CN212450162U CN202020873208.5U CN202020873208U CN212450162U CN 212450162 U CN212450162 U CN 212450162U CN 202020873208 U CN202020873208 U CN 202020873208U CN 212450162 U CN212450162 U CN 212450162U
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Abstract
The utility model relates to an elevator machinery speed limit protection device, including speed limit wire rope, car frame and safety tongs, the upper beam one end of car frame is equipped with the speed limit rope sheave that links to each other with speed limit wire rope, be equipped with centrifugal throwing block on the speed limit rope sheave, speed limit rope sheave below is equipped with produces the pivoted gag lever post by centrifugal throwing block striking after, it carries the connecting rod to be equipped with between the pull rod of gag lever post and safety tongs to carry, carry and draw connecting rod one end and gag lever post lower extreme joint, the other end is articulated with safety tongs's pull rod upper end, it is connected with extension spring to carry and draw connecting rod top, when the gag lever post is thrown the piece striking and upwards the pendulum and change to and carry the connecting rod separation to carry, extension spring drives safety tongs. The utility model discloses a set up the speed limit rope sheave at the car frame, utilize the centrifugation to get rid of the piece and detach the joint restriction of carrying the connecting rod under high-speed rotation, be convenient for carry the pull rod of carrying the quick pulling safety tongs of connecting rod, and then realize the quick action of safety tongs, structural design is reasonable, effectively shortens brake time.
Description
The technical field is as follows:
the utility model relates to an elevator machinery speed limit protection device.
Background art:
in the prior art, a steel wire rope of an elevator speed limiter is connected with a safety gear through a mechanical connecting rod, and when speed is limited, the steel wire rope of the speed limiter pulls the safety gear to operate through the mechanical connecting rod, so that the safety gear generates friction force on a guide rail. However, the existing elevator speed limiting structure is complex, the production cost is increased, and when the elevator exceeds the speed, the steel wire rope of the speed limiter is easy to shake violently, so that the steel wire rope of the speed limiter cannot pull the safety gear in time, the braking time is prolonged, and accidents are easy to cause.
The utility model has the following contents:
the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a mechanical speed limit protection device of elevator is provided, structural design is reasonable, makes things convenient for the safety tongs to act fast.
In order to realize the purpose, the utility model discloses a technical scheme is: a mechanical speed-limiting protection device of an elevator comprises a speed-limiting steel wire rope vertically arranged in a hoistway, a car frame and a safety gear arranged at the bottom of one side of the car frame, wherein a speed-limiting rope wheel connected with the speed-limiting steel wire rope is arranged at one end of an upper beam of the car frame, a centrifugal throwing block capable of rotating outwards along with the rotation of the speed-limiting rope wheel is arranged on the speed-limiting rope wheel, a limiting rod capable of rotating after being impacted by the centrifugal throwing block is arranged below the speed-limiting rope wheel, a rotatable lifting connecting rod is arranged between the limiting rod and a pull rod of the safety gear, one end of the lifting connecting rod is clamped with the lower end of the limiting rod, the other end of the lifting connecting rod is hinged with the upper end of the pull rod of the safety gear, a tension spring is connected above the lifting connecting rod, and when the limiting rod is impacted by the centrifugal throwing block and swings upwards to be, so that the pulling connecting rod drives the pulling rod of the safety gear to move upwards.
Furthermore, the middle part of the speed limiting rope wheel is connected with a rope wheel rotating shaft, and the rope wheel rotating shaft is arranged at one end of an upper beam of the car frame; the centrifugal throwing blocks are in a pair, and the axes of the rope wheel rotating shafts of the centrifugal throwing blocks are centrosymmetric.
Furthermore, the centrifugal throwing block is arc-shaped, one end of the centrifugal throwing block is rotatably connected with the speed-limiting rope wheel, the inner side of the centrifugal throwing block is connected with a centrifugal spring, and when the centrifugal throwing block rotates towards the outer side, the centrifugal spring generates a centrifugal tensile force towards the inner side.
Furthermore, the upper end of the limiting rod is rotatably connected with an upper beam of the car frame, and the lower end of one side surface of the limiting rod, which is close to the lifting connecting rod, is provided with a limiting bayonet; and one end of the lifting connecting rod, which is close to the limiting rod, is provided with a limiting clamping block which is clamped in the limiting clamping opening.
Furthermore, one side of the limiting rod, which is close to the extension spring, is provided with a return spring for pulling the limiting rod to swing downwards to a limiting bayonet and be in clamping fit with a limiting clamping block.
Furthermore, one end of the lifting connecting rod, which is close to the limiting rod, is rotatably connected with an upper beam of the car frame, and the extension spring is positioned between the rotating center of the lifting connecting rod and the pull rod of the safety gear.
Furthermore, a transverse sliding groove is formed in the upper end of the pull rod of the safety tongs, a hinge shaft penetrates through the transverse sliding groove in a sliding mode, and the hinge shaft is rotatably connected with the lifting connecting rod.
Furthermore, the speed-limiting steel wire rope is wound around the speed-limiting rope wheel by a circle, the upper end of the speed-limiting steel wire rope is fixed on a rope hitch plate on the bearing beam of the elevator, and the lower end of the speed-limiting steel wire rope is connected with a tension spring fixed at the bottom of the hoistway.
Furthermore, the speed-limiting rope wheel is provided with an absolute value encoder which rotates synchronously with the speed-limiting rope wheel, the absolute value encoder comprises an absolute type rotary encoder module and a sensor receiver, the absolute type rotary encoder module is screwed on the speed-limiting rope wheel and sleeved on a rope wheel rotating shaft, the sensor receiver is arranged on the periphery of the absolute type rotary encoder module, the absolute type rotary encoder module is disc-shaped, the absolute type rotary encoder module is provided with a forward rotation receiving point and a reverse rotation receiving point, and the forward rotation receiving point and the reverse rotation receiving point are positioned on two different concentric circles on the end surface of the absolute type rotary encoder module.
Compared with the prior art, the utility model discloses following effect has: the utility model discloses a setting up at the upper beam of car frame can be by speed limit wire rope drive pivoted speed limit rope sheave, utilizes the centrifugation on the speed limit rope sheave to get rid of the joint restriction of carrying the connecting rod under high-speed rotation, is convenient for carry the pull rod of carrying the quick pulling safety tongs of connecting rod, and then realizes the quick action of safety tongs, and structural design is reasonable, effectively shortens brake time.
Description of the drawings:
fig. 1 is a schematic front view of a first embodiment of the present invention;
FIG. 2 is a schematic view of a structure of a speed-limiting rope wheel, a centrifugal throwing block, a limiting rod and a lifting connecting rod of the first embodiment of the present invention;
FIG. 3 is a schematic view of the operating state of FIG. 2;
fig. 4 is a schematic view of a partial side view of a first embodiment of the present invention;
FIG. 5 is a schematic view of the second embodiment of the present invention
Fig. 6 is a schematic perspective view of a second embodiment of the present invention;
FIG. 7 is an enlarged view taken at A in FIG. 6;
fig. 8 is a front view of an absolute rotary encoder module according to a second embodiment of the present invention.
In the figure:
1-speed limiting steel wire rope; 2-a car frame; 201-upper beam of car frame; 3-safety tongs; 301-a pull rod; 4-speed limiting rope wheel; 5-centrifugal throwing block; 6-a limiting rod; 7-pulling the connecting rod; 8-extension spring; 9-a sheave shaft; 10-a first hinge axis of rotation; 11-centrifugal spring; 12-a second hinge axis of rotation; 13-limiting bayonet; 14-a limit clamping block; 15-a return spring; 16-a third hinge axis of rotation; 17-a transverse chute; 18-a hinged axis; 19-rope hitch plate; 20-a tension spring; 21-a well; 22-a car; 23-a guide rail; 24-absolute rotary encoder module; 25-a sensor receiver; 26-a fixing frame; 27-inverting the reception point; 28-forward rotation receiving point.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The first embodiment is as follows: as shown in fig. 1 to 4, the present invention relates to an elevator machinery speed-limiting protection device, which comprises a speed-limiting steel wire rope 1 vertically arranged in a hoistway, a car frame 2 and a safety gear 3 installed at the bottom of one side of the car frame 2, wherein the safety gear 3 is an existing mature product, and the safety gear 3 is driven by a pull rod 301 thereof to operate; one end of an upper beam 201 of the car frame is provided with a speed-limiting rope wheel 4 connected with a speed-limiting steel wire rope 1, the speed-limiting rope wheel 4 is arranged on the inner side of the speed-limiting steel wire rope 1, the speed-limiting rope wheel 4 is driven by the speed-limiting steel wire rope 1 to move synchronously, a centrifugal throwing block 5 capable of rotating outwards along with the rotation of the speed-limiting rope wheel 4 is arranged on the speed-limiting rope wheel 4, a limiting rod 6 capable of rotating after being impacted by the centrifugal throwing block is arranged below the speed-limiting rope wheel 4, a rotatable lifting connecting rod 7 is arranged between the limiting rod 6 and a pull rod 301 of the safety tongs 3, one end of the lifting connecting rod 7 is clamped with the lower end of the limiting rod 6, the other end of the lifting connecting rod 7 is hinged with the upper end of the pull rod 301 of the safety tongs 3, a tension spring 8 in a tension state is connected above the lifting connecting rod 7, the extension spring 8 pulls the lifting connecting rod 7 to swing upwards, so that the lifting connecting rod 7 drives the pull rod 301 of the safety gear 3 to move upwards. The speed-limiting rope wheel 4 which can be driven to rotate by the speed-limiting steel wire rope 1 is arranged on the upper beam 201 of the car frame, the centrifugal throwing block 5 on the speed-limiting rope wheel 4 is driven to move outwards under the action of centrifugal force generated by high-speed rotation, the centrifugal throwing block drives the lifting connecting rod to release clamping limitation, the lifting connecting rod can be conveniently lifted, the pull rod of the safety gear can be quickly pulled, the safety gear can quickly move, the structural design is reasonable, and the braking time is effectively shortened.
In this embodiment, the middle part of the speed-limiting rope wheel 4 is connected with a rope wheel rotating shaft 9, the rope wheel rotating shaft 9 is installed at one end of an upper beam 201 of the car frame through a bearing seat, and the speed-limiting rope wheel 4 and the safety gear 3 are located on the same side; the centrifugal flail blocks 5 are in a pair, and the axes of the rope wheel rotating shafts 9 of the centrifugal flail blocks 5 are in central symmetry. Preferably, the centrifugal swing block 5 is arc-shaped, and the arc opening direction faces the rope pulley rotating shaft 9; one end of the centrifugal throwing block 5 is rotatably connected with the speed-limiting rope wheel 4 through a first hinge rotating shaft 10, the inner side of the centrifugal throwing block 5 is connected with a centrifugal spring 11, and when the centrifugal throwing block 5 rotates outwards, the centrifugal spring 11 generates an inwards centrifugal tensile force; it should be noted that the centrifugal spring is installed on the speed-limiting rope wheel, and the centrifugal spring and the pair of centrifugal flappers are both arranged on one side of the speed-limiting rope wheel close to the upper beam of the car frame.
In this embodiment, the upper end of the limiting rod 6 is rotatably connected with the upper beam 201 of the car frame through the second hinge rotating shaft 12, and the lower end of one side surface of the limiting rod 6 close to the pull-up connecting rod 7 is provided with a rectangular limiting bayonet 13; one end of the lifting connecting rod 7 close to the limiting rod 6 is provided with a rectangular limiting clamping block 14 clamped in the limiting bayonet 13.
In this embodiment, one side of the limiting rod 6 close to the extension spring 8 is provided with a return spring 15 for pulling the limiting rod 6 to swing downwards to the limiting bayonet 13 and be in clamping fit with the limiting clamping block 14. Namely: when the braking lower speed of the elevator at the safety gear is reduced, the safety gear can drive the pull rod of the safety gear to move downwards due to the self resetting capability, the safety gear is in contact with the braking action, the lifting connecting rod can be driven to swing downwards to reset, the limiting rod swings downwards to reset under the pulling of the reset spring, and under the condition that the lifting connecting rod and the limiting rod are reset, the limiting clamping block on the lifting connecting rod and the limiting bayonet at the lower end of the limiting rod can be enabled to restore the clamping fit again.
In this embodiment, one end of the lifting connecting rod 7 close to the limiting rod 6 is rotatably connected with an upper beam 201 of the car frame through a third hinge rotating shaft 16, the extension spring 8 is vertically arranged and is located between a rotation center of the lifting connecting rod 7 and a pull rod 301 of the safety gear 3, when a limiting clamping block 14 of the lifting connecting rod 7 is in clamping fit with a limiting bayonet 13 at the lower end of the limiting rod 6, the lifting connecting rod 7 is kept still, and at this time, the extension spring 8 is already in a stretching state; when the limiting clamping block 14 of the lifting connecting rod 7 is separated from the limiting bayonet 13 at the lower end of the limiting rod 6, the lifting connecting rod 7 can be quickly pulled to swing upwards by utilizing the upward pulling force of the extension spring 8, and then the pulling rod 301 of the safety gear 3 is pulled to move upwards quickly through the lifting connecting rod 7, so that the safety gear operates.
In this embodiment, a horizontal sliding groove 17 is provided at the upper end of the pull rod 301 of the safety gear 3, a hinge shaft 18 is slidably inserted in the horizontal sliding groove 17, and the hinge shaft 18 is rotatably connected with the lifting connecting rod 7.
In this embodiment, the speed-limiting steel wire rope is a single (strip-shaped, non-closed loop structure), the speed-limiting steel wire rope is wound around the speed-limiting rope wheel for one turn, the upper end of the speed-limiting steel wire rope is fixed on a rope hitch plate 19 on the elevator bearing beam, the lower end of the speed-limiting steel wire rope is connected with a tension spring 20 fixed at the bottom of the hoistway, the tension spring provides tension for the speed-limiting steel wire rope, and sufficient friction force is ensured between.
In the embodiment, the rope sheave rotating shaft fixing device further comprises a fixing frame, wherein the fixing frame is horizontally arranged at one end of the upper beam of the car frame, one end of the fixing frame is screwed at the end part of the upper beam of the car frame, and the other end of the fixing frame is inserted and fixed with the rope sheave rotating shaft.
In this embodiment, it should be noted that the extension spring and the return spring are both mounted on the upper beam of the car frame.
The utility model has the advantages that:
(1) the speed-limiting rope wheel which can be driven to rotate by the speed-limiting steel wire rope is arranged on the upper beam of the car frame, and is thrown out under high-speed rotation by using the centrifugal throwing block on the speed-limiting rope wheel, and the clamping limit of the lifting connecting rod is removed, so that the lifting connecting rod can conveniently and quickly pull the pull rod of the safety tongs, the safety tongs can quickly act, the structural design is reasonable, and the braking time is effectively shortened;
(2) compared with the existing elevator structure, the elevator speed limiter with a complex structure is omitted, so that the production cost can be obviously reduced.
In this embodiment, during specific operation: (1) when the elevator normally works, the speed-limiting rope wheel 4 normally rotates, the centrifugal force generated at the moment is small, the pair of centrifugal throwing blocks 5 do not impact the upper end of the limiting rod 6, and because the limiting bayonet 13 at the lower end of the limiting rod 6 is in clamping fit with the limiting clamping block 14 of the lifting connecting rod 7, the stretching spring 8 in a stretching state cannot drive the lifting connecting rod 7 to swing upwards at the moment, and the lifting connecting rod 7 and the limiting rod 6 are kept still; (2) when the elevator is overspeed, the speed-limiting rope wheel 4 is driven by the speed-limiting steel wire rope 1 to rotate at a high speed, a pair of centrifugal throwers on the speed-limiting rope wheel 4 rotate outwards under the action of centrifugal force and impact the upper end of the limiting rod 6, the lower end of the limiting rod 6 swings upwards under the impact of the centrifugal throwers 5 until the limiting bayonet 13 is separated from the limiting fixture block 14, then the tension spring 8 pulls the lifting connecting rod 7 to swing upwards by means of self-tension elasticity, the lifting connecting rod 7 swings upwards and pulls the pull rod 301 of the safety tongs 3 to move upwards at the same time of swinging upwards, so that the safety tongs 3 operate and generate friction force on the guide rail 23, the car 22 is quickly braked on the guide rail 23, and.
Example two: as shown in fig. 5, 6, 7 and 8, the present embodiment is different from the first embodiment in that: the speed limiting rope wheel is provided with an absolute value encoder which synchronously rotates with the speed limiting rope wheel, the absolute value encoder comprises an absolute type rotary encoder module and a sensor receiver, the absolute type rotary encoder module is screwed on the speed limiting rope wheel and sleeved on a rope wheel rotating shaft, the sensor receiver is arranged on the periphery of the absolute type rotary encoder module, and the absolute value rotary encoder can reflect the up-and-down linear motion characteristic of the lift car through the sensor receiver.
In this embodiment, the absolute rotary encoder module is disc-shaped, and the absolute rotary encoder module is provided with a forward rotation receiving point and a reverse rotation receiving point.
In this embodiment, the forward rotation receiving point and the reverse rotation receiving point are located on two different concentric circles on the end surface of the absolute rotary encoder module.
In this embodiment, the absolute value encoder is a rotary variable multi-turn absolute value rotary encoder, and has a digital serial port and an SSI output interface, and is widely used. Besides the position of the elevator can be effectively judged after the fault occurs, the sensor can be used as a sensor to reflect the vertical motion characteristics of the elevator car, such as speed, acceleration, kinetic energy, micro displacement and the like, in many occasions.
In the embodiment, when the lift car vertically runs up and down, the speed-limiting rope wheel performs rotary motion under the action of the speed-limiting steel wire rope, the speed-limiting rope wheel drives the synchronous absolute rotary encoder module to rotate, the sensor receiver receives the motion characteristics of the elevator which is reflected, and meanwhile, when the lift car stops at a certain position in a well or is leveled at any floor, if a positive rotation receiving point receives a signal firstly, the lift car is indicated to go upwards; on the contrary, the reverse receiving point receives the signal first, which indicates that the car descends. The absolute value encoder is installed on the speed limiting rope wheel, so that the characteristic of vertical linear motion of the lift car can be conveniently and quickly obtained.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (9)
1. The utility model provides an elevator machinery speed limit protection device, includes speed limit wire rope, the car frame of vertical setting in the well and installs the safety tongs in car frame one side bottom, its characterized in that: the speed limiting rope wheel connected with the speed limiting steel wire rope is arranged at one end of an upper beam of the car frame, a centrifugal throwing block capable of rotating outwards along with the rotation of the speed limiting rope wheel is arranged on the speed limiting rope wheel, a limiting rod capable of rotating after being impacted by the centrifugal throwing block is arranged below the speed limiting rope wheel, a rotatable lifting connecting rod is arranged between the limiting rod and a pull rod of the safety tongs, one end of the lifting connecting rod is connected with the lower end of the limiting rod in a clamping mode, the other end of the lifting connecting rod is hinged to the upper end of the pull rod of the safety tongs, a stretching spring is connected above the lifting connecting rod, and when the limiting rod is impacted by the centrifugal throwing block and swings upwards to be separated from the lifting connecting rod, the stretching spring pulls the lifting connecting rod to swing upwards so that the lifting connecting rod.
2. The elevator machine speed limit protection device of claim 1, wherein: the middle part of the speed limiting rope wheel is connected with a rope wheel rotating shaft, and the rope wheel rotating shaft is arranged at one end of an upper beam of the car frame; the centrifugal throwing blocks are in a pair, and the axes of the rope wheel rotating shafts of the centrifugal throwing blocks are centrosymmetric.
3. The elevator machine speed limit protection device of claim 2, wherein: the centrifugal throwing block is arc-shaped, one end of the centrifugal throwing block is rotatably connected with the speed-limiting rope wheel, the inner side of the centrifugal throwing block is connected with a centrifugal spring, and when the centrifugal throwing block rotates towards the outer side, the centrifugal spring generates centrifugal tension towards the inner side.
4. The elevator machine speed limit protection device of claim 1, wherein: the upper end of the limiting rod is rotatably connected with an upper beam of the car frame, and the lower end of one side surface of the limiting rod, which is close to the lifting connecting rod, is provided with a limiting bayonet; and one end of the lifting connecting rod, which is close to the limiting rod, is provided with a limiting clamping block which is clamped in the limiting clamping opening.
5. The elevator machine speed limit protection device of claim 4, wherein: one side of the limiting rod, which is close to the extension spring, is provided with a return spring which is used for pulling the limiting rod to swing downwards to a limiting bayonet and is in clamping fit with a limiting clamping block.
6. The elevator machine speed limit protection device of claim 1, wherein: one end of the lifting connecting rod, which is close to the limiting rod, is rotatably connected with an upper beam of the car frame, and the extension spring is positioned between the rotating center of the lifting connecting rod and a pull rod of the safety gear.
7. The elevator machine speed limit protection device of claim 1, wherein: the upper end of the pull rod of the safety tongs is provided with a transverse sliding groove, a hinged shaft is arranged in the transverse sliding groove in a sliding and penetrating mode, and the hinged shaft is rotatably connected with the lifting connecting rod.
8. The elevator machine speed limit protection device of claim 1, wherein: the speed-limiting steel wire rope is wound around the speed-limiting rope wheel by a circle, the upper end of the speed-limiting steel wire rope is fixed on a rope hitch plate on the bearing beam of the elevator, and the lower end of the speed-limiting steel wire rope is connected with a tension spring fixed at the bottom of the hoistway.
9. The elevator mechanical speed limit protection device of claim 1 or 8, wherein: the speed-limiting rope wheel is provided with an absolute value encoder which synchronously rotates with the speed-limiting rope wheel, the absolute value encoder comprises an absolute type rotary encoder module and a sensor receiver, the absolute type rotary encoder module is screwed on the speed-limiting rope wheel and sleeved on a rope wheel rotating shaft, the sensor receiver is arranged on the periphery of the absolute type rotary encoder module, the absolute type rotary encoder module is disc-shaped, a forward rotation receiving point and a reverse rotation receiving point are arranged on the absolute type rotary encoder module, and the forward rotation receiving point and the reverse rotation receiving point are positioned on two different concentric circles on the end face of the absolute type rotary encoder module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020873208.5U CN212450162U (en) | 2020-05-22 | 2020-05-22 | Mechanical speed limiting protection device for elevator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020873208.5U CN212450162U (en) | 2020-05-22 | 2020-05-22 | Mechanical speed limiting protection device for elevator |
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| CN212450162U true CN212450162U (en) | 2021-02-02 |
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| CN202020873208.5U Active CN212450162U (en) | 2020-05-22 | 2020-05-22 | Mechanical speed limiting protection device for elevator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111498638A (en) * | 2020-05-22 | 2020-08-07 | 福州快科电梯工业有限公司 | Mechanical speed limiting protection device for elevator and working method thereof |
| CN113526371A (en) * | 2021-09-16 | 2021-10-22 | 徐州清歌机械制造有限公司 | A safe type promotes transfer device for building material |
-
2020
- 2020-05-22 CN CN202020873208.5U patent/CN212450162U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111498638A (en) * | 2020-05-22 | 2020-08-07 | 福州快科电梯工业有限公司 | Mechanical speed limiting protection device for elevator and working method thereof |
| CN113526371A (en) * | 2021-09-16 | 2021-10-22 | 徐州清歌机械制造有限公司 | A safe type promotes transfer device for building material |
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