CN110745663A - System for carrying out safety protection on elevator maintainers with shallow pits - Google Patents
System for carrying out safety protection on elevator maintainers with shallow pits Download PDFInfo
- Publication number
- CN110745663A CN110745663A CN201911204409.4A CN201911204409A CN110745663A CN 110745663 A CN110745663 A CN 110745663A CN 201911204409 A CN201911204409 A CN 201911204409A CN 110745663 A CN110745663 A CN 110745663A
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- Prior art keywords
- elevator
- car
- door
- jacking mechanism
- switch
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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
- B66B5/0043—Devices enhancing safety during maintenance
- B66B5/005—Safety of maintenance personnel
Abstract
The invention discloses a system for carrying out safety protection on elevator maintainers with shallow pits, which is characterized by comprising a car blocking device and a door opening detection system, wherein the car blocking device comprises a base, a supporting top arm, a blocking top plate and a jacking mechanism; the supporting top arm can be pushed to rotate by taking the base as a fulcrum through the extension of the jacking mechanism, so that the blocking top plate rotates to a horizontal state to block the bottom of the lift car; when the door opening detection system detects that the car door is closed, the elevator landing door is opened and the elevator landing door is in sliding contact with the induction pressing strip, the transmission plate is driven by the power of the induction pressing strip, and then the firing pin is collided to the switch of the blocking device, so that the blocking top plate can support the bottom of the car. When the elevator maintenance system is used for maintenance, a maintenance worker can give enough space for maintenance, so that the safety of the maintenance worker is guaranteed.
Description
Technical Field
The invention belongs to the technical field of elevator suspension, and particularly relates to a system for carrying out safety protection on elevator maintainers with shallow pits.
Background
For some old buildings, elevator projects are additionally installed, because of the limitation of old communities, in order to meet the requirements of fire fighting, light removal, structural safety and the like, a stereo garage, a water, electricity and gas official net, a septic tank and the like possibly exist below the position selected by an elevator, so that a pit of the elevator must be made into a shallow pit. And the condition that the elevator pit is shallow leads to that the maintenance height space of the elevator pit can not meet the requirement of safe maintenance, so that maintenance personnel can not normally enter the pit. In order to ensure the safety of the maintenance personnel entering the elevator pit, the elevator needs to be blocked from going downwards, so that the safety of the maintenance personnel is not threatened by the elevator.
CN208327012U discloses a shallow pit elevator maintenance device, which comprises a fixed base and a movable base, wherein the bottom end of the fixed base is connected with the ground through a bolt, and the top of the fixed base is provided with a buffer; the movable base is characterized in that a buffer is arranged at the top of the movable base, the lower portion of the movable base is hinged to the fixed base through a pin shaft, the distance from the top of the movable base to the pin shaft is larger than the distance from the top of the fixed base to the pin shaft, a lock hook is hinged to the movable base, a lock column matched with the lock hook is arranged on the fixed base, and a reset spring is arranged on the lock hook.
Although the maintenance device for the elevator with the shallow pit can ensure that the elevator car does not collide with the ground when in operation and can ensure that the elevator car has enough ground clearance when in maintenance, the maintenance device for the elevator with the shallow pit needs to be manually controlled, consumes manpower and is still inconvenient in practical application.
Therefore, how to provide a system which has a simple structure, can intelligently drive to block the elevator from going downwards and ensure the safety of maintenance personnel entering a pit to carry out safety protection on maintenance personnel of the shallow pit elevator becomes a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a simple structure can intelligent drive stop the elevator and go down, guarantee to get into the maintenance personal safety of pit carry out safety protection's system to shallow pit elevator maintainer.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a system for carry out safety protection to shallow pit elevator maintainer, includes elevator well and car, and this car has the sedan-chair door, the elevator well corresponds each floor and is equipped with the door opening respectively, and its bottom forms the pit, is equipped with elevator layer door in the door opening inboard, and its characterized in that still includes:
the door opening detection device is arranged on one side of the bottom door opening and comprises a fixed rod, two induction pressing strips, a pressing strip reset spring and an induction control structure; the fixed rod is horizontally arranged in the elevator shaft, the length direction of the fixed rod is consistent with the opening and closing direction of the elevator landing door, one end of the fixed rod is fixedly connected with the side wall of the elevator shaft, the other end of the fixed rod extends into a gap between the elevator landing door and the car door, and the fixed rod is positioned in the middle of the gap between the elevator landing door and the car door; the two induction pressing strips are positioned on the upper side or the lower side of the fixing rod and are respectively positioned between the fixing rod and the elevator landing door and the car door, wherein one ends of the two induction pressing strips, which are close to the elevator landing door, are connected with the fixing rod, the other ends of the two induction pressing strips extend towards the side wall direction of the elevator shaft and incline towards the opposite direction to form free ends, the free ends of the two induction pressing strips are respectively provided with a roller, and when the elevator landing door and the car door are opened simultaneously, the elevator landing door and the car door can be simultaneously contacted with the corresponding rollers; the pressing strip return spring is positioned between the two induction pressing strips, and two ends of the pressing strip return spring are respectively connected with the two induction pressing strips; the induction control structure is arranged on the fixed rod and comprises a contact switch, a transmission plate and a reset torsion spring, wherein the contact switch is provided with a switch contact piece which is vertically arranged; the transmission plate is horizontally arranged between the two induction pressing strips and is rotationally connected with the fixed rod through a lantern ring, the length direction of the transmission plate is perpendicular to the length direction of the fixed rod, and two ends of the transmission plate are opposite to the induction pressing strips; the transmission plate and the switch contact sheet are positioned on the same side of the contact switch, one side of the transmission plate, which is close to the contact switch, is provided with a firing pin, the firing pin extends towards the direction of the contact switch and is staggered with the switch contact sheet, the firing pin is positioned on one side of the switch contact sheet, which is close to the elevator landing door, and a gap is reserved between the firing pin and the switch contact sheet, when the elevator landing door presses the induction pressing strip, the induction pressing strip can press the transmission plate, so that the transmission plate rotates around the fixed rod, and the firing pin is driven to be in contact with the switch contact; the reset torsion spring is sleeved on the fixed rod and is positioned on one side of the transmission plate, which is far away from the contact switch, one support arm of the reset torsion spring is fixedly connected with the transmission plate, and the other support arm of the reset torsion spring is fixedly connected with the fixed rod through a fixed plate;
the elevator car blocking device comprises a base, a supporting top arm, a blocking top plate and a jacking mechanism, wherein the base is fixedly installed at the bottom of a pit of an elevator shaft, one end of the supporting top arm is rotatably connected with the base, and the other end of the supporting top arm is connected with the blocking top plate; the lower end of the jacking mechanism is rotatably connected with the bottom pit bottom plate through a support, and the upper end of the jacking mechanism is rotatably connected with the middle part of the supporting top arm; a car collision block is arranged at the bottom of the car, and the supporting top arm can be pushed to rotate around the base through the extension of the jacking mechanism, so that the blocking top plate rotates to a horizontal state and is opposite to the car collision block;
the controller, contact switch and climbing mechanism all link to each other with this controller, and after the contact switch action, the controller can control the climbing mechanism extension in order to carry out the jacking to supporting the top arm.
Therefore, when a maintenance worker enters an elevator pit to overhaul an elevator, the elevator car stops at a non-bottom position, the elevator landing door is independently opened at the moment, the elevator landing door horizontally moves along the sill to touch the induction pressing strip close to one side of the elevator landing door, the pressing strip return spring is in a compressed state at the moment, the induction pressing strip transmits pressure to the transmission plate, the striker further touches the switch of the blocking device, the car blocking device is in a working state and blocks the bottom of the car, a large enough space is provided for the maintenance worker to maintain, the car is prevented from descending, and the safety of the maintenance worker is guaranteed;
after the maintenance of maintenance personnel is accomplished, close elevator layer door, the dead lever is kept away from under layering reset spring's restoring force effect to the response layering that is close to elevator layer door one side, and the firing pin gets back to initial position along with the driving plate, and the blocking device switch disconnection is in off-working state, and at this moment, the elevator can resume the operation and normal reciprocating in the pit.
Further, the jacking mechanism adopts a cylinder, a hydraulic cylinder or an electric telescopic mechanism;
furthermore, the electric telescopic mechanism adopts an electric cylinder or an electric push rod to realize the telescopic action.
In this way, the blocking roof enables better blocking of the car bottom.
Further, the lower side of the middle part of the supporting jacking arm is provided with a groove, wherein the upper end of the jacking mechanism is also provided with a pulley, and the upper end of the jacking mechanism extends into the groove so that the pulley is arranged in the groove.
Thus, the jacking mechanism can better push the supporting jacking arm.
Furthermore, the controller is a conversion type relay, the jacking mechanism adopts an electric push rod, a static contact of the relay is connected with a contact switch in series, a normally open movable contact group and a normally closed movable contact group of the relay are respectively connected with the jacking mechanism in parallel, the power supply directions of the normally open movable contact group and the normally closed movable contact group are opposite, and the jacking mechanism is in a contraction state in an initial state; when the contact switch is closed, the relay can control the reverse electrification of the jacking mechanism, so that the jacking mechanism extends out; when the contact switch is disconnected again, the relay restores the electrifying direction of the jacking mechanism, so that the jacking mechanism retracts.
Thus, the whole control loop is simpler in structure and better in stability.
Furthermore, the controller and the door opening detection system are electrically connected with a signal receiver, the contact switch firstly sends an electric signal to the signal receiver, and the signal receiver controls the car blocking device through the controller.
Drawings
Fig. 1 is a schematic view of the structure of the car bottom of the present invention.
Fig. 2 is an enlarged schematic view of the structure at a in fig. 1 according to the present invention.
Fig. 3 is a schematic view of the structure of the car door and the landing door of the present invention when both are open.
Fig. 4 is an enlarged schematic view of the present invention at B in fig. 3.
Fig. 5 is a schematic view of the structure of the C-C viewing angle in fig. 3 according to the present invention.
Fig. 6 is a schematic view of the structure of the present invention with only the landing doors open.
Fig. 7 is a schematic diagram of the D-D viewing angle of fig. 6 according to the present invention.
Fig. 8 is a schematic structural view of the car blocking apparatus of the present invention in an inoperative state.
Fig. 9 is a schematic structural view of the car blocking device of the present invention in an operating state.
The reference numbers illustrate: a car 1; a car door 2; an elevator landing door 3; a base 4; a supporting top arm 5; a blocking top plate 6; a jacking mechanism 7; a fixing rod 8; an induction batten 9; a depression bar return spring 10; a drive plate 11; a striker 12; a contact switch 13; a car crash block 14; a recess 15; a roller 16; a return torsion spring 17; a fixed plate 18; a switch contact 20; a pulley 21; an elevator hoistway 22; a signal receiver 23; a controller 24.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Example 1: referring to fig. 1 to 9, a system for performing safety protection on a shallow pit elevator maintainer comprises an elevator shaft 22 and a car 1, wherein the car 1 is provided with a car door 2, the elevator shaft 22 is respectively provided with a door opening corresponding to each floor, a pit is formed at the bottom of the elevator shaft, an elevator landing door 3 is arranged on the inner side of the door opening, the system further comprises a door opening detection device, a car blocking device and a controller, the door opening detection device is arranged on one side of the bottom landing door opening and comprises a fixing rod 8, two induction pressing strips 9, a pressing strip reset spring 10 and an induction control structure; the dead lever 8 level sets up in elevator well 22, and its length direction is unanimous with the switch direction of elevator layer door 3, and this dead lever 8 one end and elevator well 22's lateral wall fixed connection, the other end extends to in the clearance between elevator layer door 3 and the sedan-chair door 2, and dead lever 8 is located the middle part of the horizontal direction in the clearance between elevator layer door 3 and sedan-chair door 2. Two response layering 9 are located the upside or the downside of dead lever 8 to be located respectively between dead lever 8 and elevator layer door 3 and sedan-chair door 2, wherein, two response layering 9 are close to the one end of elevator layer door 3 and link to each other with dead lever 8, and the other end extends and inclines to the direction that deviates from mutually to the lateral wall direction of elevator well 22, forms the free end, is equipped with a gyro wheel 16 respectively at the free end of two response layering 9, and when elevator layer door 3 and sedan-chair door 2 opened simultaneously, elevator layer door 3 and sedan-chair door 2 can contact with corresponding gyro wheel 16 simultaneously. The pressing strip return spring 10 is positioned between the two induction pressing strips 9, and two ends of the pressing strip return spring 10 are respectively connected with the two induction pressing strips 9; the induction control structure is arranged on the fixed rod 8 and comprises a contact switch 13, a transmission plate 11 and a reset torsion spring 17, the contact switch 13 is provided with a switch contact piece 20, the switch contact piece 20 is vertically arranged, the transmission plate 11 is horizontally arranged between the two induction pressing strips 9 and is rotatably connected with the fixed rod 8 through a lantern ring (not shown), the length direction of the transmission plate 11 is perpendicular to the length direction of the fixed rod 8, and two ends of the transmission plate are opposite to the induction pressing strips 9; the transmission plate 11 and the switch contact piece 20 are positioned on the same side of the contact switch 13, one side of the transmission plate, which is close to the contact switch 13, is provided with a striker 12, the striker 12 extends towards the contact switch 13 and is staggered with the switch contact piece 20, the striker 12 is positioned on one side of the switch contact piece 20, which is close to the elevator layer door 3, and a gap is formed between the striker 12 and the switch contact piece 20, when the elevator layer door 3 presses the induction pressing strip 9, the induction pressing strip 9 can press the transmission plate 11, so that the transmission plate 11 rotates around the fixed rod 8, and the striker 12 is driven to be in contact with the switch contact piece 20, so that the contact switch 13 acts; the reset torsion spring 17 is sleeved on the fixing rod 8 and is positioned on one side of the transmission plate 11 departing from the contact switch 13, one support arm of the reset torsion spring is fixedly connected with the transmission plate 11, and the other support arm is fixedly connected with the fixing rod 8 through a fixing plate 18. The car blocking device comprises a base 4, a supporting top arm 5, a blocking top plate 6 and a jacking mechanism 7, wherein the base 4 is fixedly installed at the bottom of a pit of an elevator shaft 22, one end of the supporting top arm 5 is rotatably connected with the base 4, the other end of the supporting top arm is connected with the blocking top plate 6, and the blocking top plate 6 can be positioned in a horizontal state after rotating along with the supporting top arm 5; the lower end of the jacking mechanism 7 is rotatably connected with the bottom plate of the pit through a support, and the upper end of the jacking mechanism 7 is rotatably connected with the middle part of the supporting top arm 5, wherein the rotating axial leads of the supporting top arm 5 and the jacking mechanism 7 are horizontally arranged and are mutually parallel, so that the supporting top arm 5 and the jacking mechanism 7 can rotate in a vertical plane; the bottom of the car 1 is provided with a car collision block 14, and the supporting top arm 5 can be pushed to rotate around the base 4 through the extension of the jacking mechanism 7, so that the blocking top plate 6 rotates to a horizontal state and is right opposite to the car collision block 14. The contact switch 13 and the jacking mechanism 7 are both connected with the controller 24, and after the contact switch 13 acts, the controller 24 can control the jacking mechanism 7 to extend to jack the supporting jacking arm 5.
In one embodiment, the blocking top plate 6 is rotatably connected with the supporting top arm 5, and a certain gap is formed between the support lug of the blocking top plate 6 and the supporting top arm 5, so that after the supporting top arm 5 rotates upwards, the blocking top plate 6 can rotate to a horizontal state along with the supporting top arm to realize the alignment with the car collision block 14.
Therefore, when a maintenance worker enters an elevator pit to overhaul an elevator, the elevator car stops at a non-bottom position, the elevator landing door is independently opened at the moment, the elevator landing door horizontally moves along the sill to touch the induction pressing strip close to one side of the elevator landing door, the pressing strip return spring is in a compressed state at the moment, the induction pressing strip transmits pressure to the transmission plate, the striker further touches the switch of the blocking device, the car blocking device is in a working state and blocks the bottom of the car, a large enough space is provided for the maintenance worker to maintain, the car is prevented from descending, and the safety of the maintenance worker is guaranteed;
after the maintenance of maintenance personnel is accomplished, close elevator layer door, the dead lever is kept away from under layering reset spring's restoring force effect to the response layering that is close to elevator layer door one side, and the firing pin gets back to initial position along with the driving plate, and the blocking device switch disconnection is in off-working state, and at this moment, the elevator can resume the operation and normal reciprocating in the pit.
The jacking mechanism 7 adopts an air cylinder, a hydraulic cylinder or an electric telescopic mechanism, and the electric telescopic mechanism adopts an electric cylinder or an electric push rod to realize the extension and retraction.
In this way, the blocking roof enables better blocking of the car bottom.
The lower side of the middle part of the supporting top arm 6 is provided with a groove 15, wherein the upper end of the jacking mechanism 7 is also provided with a pulley 21, and the upper end of the jacking mechanism 7 extends into the groove 15 so that the pulley 21 is arranged in the groove 15.
Thus, the jacking mechanism can better push the supporting jacking arm.
The controller 24 is a conversion-type relay, the jacking mechanism 7 adopts an electric push rod, a stationary contact of the relay is connected in series with a contact switch, a normally open movable contact group and a normally closed movable contact group of the relay are respectively connected in parallel with the jacking mechanism, wherein the power supply directions of the normally open movable contact group and the normally closed movable contact group are opposite, and the jacking mechanism is in a contraction state in an initial state; when the contact switch is closed, the relay can control the reverse electrification of the jacking mechanism, so that the jacking mechanism extends out; when the contact switch is disconnected again, the relay restores the electrifying direction of the jacking mechanism, so that the jacking mechanism retracts.
Thus, the whole control loop is simpler in structure and better in stability.
The controller 24 and the door opening detection system are also electrically connected with a signal receiver 23, the contact switch 13 firstly sends an electric signal to the signal receiver 23, and the signal receiver 23 controls the car blocking device through the controller 24.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a system for carry out safety protection to shallow pit elevator maintainer, includes elevator well and car, and this car has the sedan-chair door, the elevator well corresponds each floor and is equipped with the door opening respectively, and its bottom forms the pit, is equipped with elevator layer door in the door opening inboard, and its characterized in that still includes:
the door opening detection device is arranged on one side of the bottom door opening and comprises a fixed rod, two induction pressing strips, a pressing strip reset spring and an induction control structure; the fixed rod is horizontally arranged in the elevator shaft, the length direction of the fixed rod is consistent with the opening and closing direction of the elevator landing door, one end of the fixed rod is fixedly connected with the side wall of the elevator shaft, the other end of the fixed rod extends into a gap between the elevator landing door and the car door, and the fixed rod is positioned in the middle of the gap between the elevator landing door and the car door; the two induction pressing strips are positioned on the upper side or the lower side of the fixing rod and are respectively positioned between the fixing rod and the elevator landing door and the car door, wherein one ends of the two induction pressing strips, which are close to the elevator landing door, are connected with the fixing rod, the other ends of the two induction pressing strips extend towards the side wall direction of the elevator shaft and incline towards the opposite direction to form free ends, the free ends of the two induction pressing strips are respectively provided with a roller, and when the elevator landing door and the car door are opened simultaneously, the elevator landing door and the car door can be simultaneously contacted with the corresponding rollers; the pressing strip return spring is positioned between the two induction pressing strips, and two ends of the pressing strip return spring are respectively connected with the two induction pressing strips; the induction control structure is arranged on the fixed rod and comprises a contact switch, a transmission plate and a reset torsion spring, wherein the contact switch is provided with a switch contact piece which is vertically arranged; the transmission plate is horizontally arranged between the two induction pressing strips and is rotationally connected with the fixed rod through a lantern ring, the length direction of the transmission plate is perpendicular to the length direction of the fixed rod, and two ends of the transmission plate are opposite to the induction pressing strips; the transmission plate and the switch contact sheet are positioned on the same side of the contact switch, one side of the transmission plate, which is close to the contact switch, is provided with a firing pin, the firing pin extends towards the direction of the contact switch and is staggered with the switch contact sheet, the firing pin is positioned on one side of the switch contact sheet, which is close to the elevator landing door, and a gap is reserved between the firing pin and the switch contact sheet, when the elevator landing door presses the induction pressing strip, the induction pressing strip can press the transmission plate, so that the transmission plate rotates around the fixed rod, and the firing pin is driven to be in contact with the switch contact; the reset torsion spring is sleeved on the fixed rod and is positioned on one side of the transmission plate, which is far away from the contact switch, one support arm of the reset torsion spring is fixedly connected with the transmission plate, and the other support arm of the reset torsion spring is fixedly connected with the fixed rod through a fixed plate;
the elevator car blocking device comprises a base, a supporting top arm, a blocking top plate and a jacking mechanism, wherein the base is fixedly installed at the bottom of a pit of an elevator shaft, one end of the supporting top arm is rotatably connected with the base, and the other end of the supporting top arm is connected with the blocking top plate; the lower end of the jacking mechanism is rotatably connected with the bottom pit bottom plate through a support, and the upper end of the jacking mechanism is rotatably connected with the middle part of the supporting top arm; a car collision block is arranged at the bottom of the car, and the supporting top arm can be pushed to rotate around the base through the extension of the jacking mechanism, so that the blocking top plate rotates to a horizontal state and is opposite to the car collision block;
the controller, contact switch and climbing mechanism all link to each other with this controller, and after the contact switch action, the controller can control the climbing mechanism extension in order to carry out the jacking to supporting the top arm.
2. The system for safety protection of the maintainer of a shallow pit elevator as claimed in claim 1, wherein the jacking mechanism is a pneumatic cylinder, a hydraulic cylinder or an electric telescopic mechanism.
3. The system for safety protection of the overhaul personnel of the shallow pit elevator as claimed in claim 2, wherein the electric telescoping mechanism is telescopic by using an electric cylinder or an electric push rod.
4. The system for safety protection of the maintainer of a shallow pit elevator as claimed in claim 1, wherein the lower side of the middle portion of the supporting top arm has a groove, and wherein the upper end of the jacking mechanism is further provided with a pulley, and the upper end of the jacking mechanism extends into the groove so that the pulley is disposed in the groove.
5. The system for safety protection of the maintainer of the elevator with shallow pit as claimed in claim 1, wherein the controller is a conversion type relay, the jacking mechanism adopts an electric push rod, a stationary contact of the relay is connected in series with a contact switch, a normally open moving contact group and a normally closed moving contact group of the relay are respectively connected in parallel with the jacking mechanism, wherein the power supply directions of the normally open moving contact group and the normally closed moving contact group are opposite, and in an initial state, the jacking mechanism is in a contracted state; when the contact switch is closed, the relay can control the reverse electrification of the jacking mechanism, so that the jacking mechanism extends out; when the contact switch is disconnected again, the relay restores the electrifying direction of the jacking mechanism, so that the jacking mechanism retracts.
6. The system for safety protection of the maintainer of the elevator with shallow pit as claimed in claim 1, wherein a signal receiver is further electrically connected between the controller and the door opening detection system, the contact switch firstly sends an electric signal to the signal receiver, and the signal receiver then controls the car blocking device through the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204409.4A CN110745663A (en) | 2019-11-29 | 2019-11-29 | System for carrying out safety protection on elevator maintainers with shallow pits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204409.4A CN110745663A (en) | 2019-11-29 | 2019-11-29 | System for carrying out safety protection on elevator maintainers with shallow pits |
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| Publication Number | Publication Date |
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| CN110745663A true CN110745663A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911204409.4A Pending CN110745663A (en) | 2019-11-29 | 2019-11-29 | System for carrying out safety protection on elevator maintainers with shallow pits |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299182A (en) * | 2020-12-08 | 2021-02-02 | 重庆迈高电梯有限公司 | Automatic change shallow pit of elevator and overhaul protection device and protection system |
-
2019
- 2019-11-29 CN CN201911204409.4A patent/CN110745663A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299182A (en) * | 2020-12-08 | 2021-02-02 | 重庆迈高电梯有限公司 | Automatic change shallow pit of elevator and overhaul protection device and protection system |
| CN112299182B (en) * | 2020-12-08 | 2023-09-01 | 重庆迈高电梯有限公司 | Automatic change shallow pit of elevator and overhaul protection device and protection system |
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