CN110745663B - System for safety protection is carried out shallow pit elevator maintainer - Google Patents
System for safety protection is carried out shallow pit elevator maintainer Download PDFInfo
- Publication number
- CN110745663B CN110745663B CN201911204409.4A CN201911204409A CN110745663B CN 110745663 B CN110745663 B CN 110745663B CN 201911204409 A CN201911204409 A CN 201911204409A CN 110745663 B CN110745663 B CN 110745663B
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- elevator
- fixed rod
- door
- car
- jacking mechanism
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- 230000000903 blocking effect Effects 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000010304 firing Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000006698 induction Effects 0.000 claims description 40
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 19
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
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- Elevator Door Apparatuses (AREA)
- Elevator Control (AREA)
Abstract
The invention discloses a system for carrying out safety protection on a shallow pit elevator maintainer, 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 upper side of the base is rotationally connected with the supporting top arm, and one end of the supporting top arm is rotationally connected with the blocking top plate; the supporting top arm can be pushed to rotate by stretching the jacking mechanism by taking the base as a fulcrum, 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 sensing pressing strip, the transmission plate is driven by the power of the sensing pressing strip, so that the firing pin is impacted to the blocking device to switch, and the blocking top plate supports the bottom of the car. When maintenance personnel overhaul the elevator, the elevator maintenance system gives the maintenance personnel enough space to maintain, and ensures the safety of the maintenance personnel.
Description
Technical Field
The invention belongs to the technical field of elevator suspension, and particularly relates to a system for protecting safety of a shallow pit elevator maintainer.
Background
For some old buildings and elevator projects, because of the limitation of old communities, a shallow pit is required to be formed under the condition that a stereo garage, a water, electricity and gas network, a septic tank and the like possibly exist below the selected position of an elevator for the reasons of fire protection, light removal, structural safety and the like. The situation that the elevator pit is shallower results in that the overhaul height space of the elevator pit cannot meet the safety overhaul requirement, so that maintenance personnel cannot normally enter the pit. In order to ensure the safety of maintenance personnel entering the elevator pit, the descending of the elevator needs to be blocked, so that the elevator cannot threaten the safety of the maintenance personnel.
CN208327012U discloses a maintenance device for a shallow pit elevator, comprising a fixed base and a movable base, wherein the bottom end of the fixed base is connected with the ground through a bolt, and a buffer is arranged at the top of the fixed base; the movable base top is provided with a buffer, the lower part of the movable base is hinged with the fixed base through a pin shaft, the distance from the top of the movable base to the pin shaft is greater than the distance from the top of the fixed base to the pin shaft, the movable base is hinged with a lock hook, the fixed base is provided with a lock column matched with the lock hook, and the lock hook is provided with a reset spring.
The shallow pit elevator maintenance device can ensure that the elevator car does not collide with the ground during operation and can ensure that the elevator car has enough ground clearance during maintenance, but the elevator maintenance device needs to be manually controlled, consumes manpower and is still inconvenient during practical application.
Therefore, how to provide a system which has a simple structure and can intelligently drive to block the elevator from descending and ensure the safety protection of the maintenance personnel entering the pit to the maintenance personnel of the shallow pit elevator becomes a technical problem to be solved by the technicians in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problems that: how can just provide a simple structure, can intelligent drive stop the elevator and descend, guarantee to get into the maintenance personal safety of pit to shallow pit elevator maintenance personnel carry out the system of safety protection.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a carry out safety protection's system 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, 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 hoistway, 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 hoistway, the other end of the fixed rod extends into a gap between the elevator landing door and the elevator car door, and the fixed rod is positioned in the middle of the gap between the elevator landing door and the elevator car door; the two induction pressing strips are positioned on the left side or the right side of the fixed rod and between the fixed rod and the elevator landing door and the elevator car door respectively, wherein one end of the two induction pressing strips, which is close to the elevator landing door, is connected with the fixed rod, the other end of the two induction pressing strips extends towards the side wall direction of the elevator hoistway and inclines towards the direction deviating from the direction, a free end is formed, the free ends of the two induction pressing strips are respectively provided with a roller, and when the elevator landing door and the elevator car door are simultaneously opened, the elevator landing door and the elevator car door can be simultaneously contacted with the corresponding rollers; the pressing strip reset spring is positioned between the two induction pressing strips, and two ends of the pressing strip reset 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, and the switch contact piece is vertically arranged; the transmission plate is horizontally arranged between the two induction press strips and is rotationally connected with the fixed rod through the 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 press strips; the transmission plate and the switch contact piece 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 forms dislocation with the switch contact piece, the firing pin is positioned on one side of the switch contact piece, which is close to the elevator landing door, and a gap is reserved between the firing pin and the switch contact piece, when the elevator landing door extrudes the induction pressing strip, the induction pressing strip can extrude the transmission plate, so that the transmission plate rotates around the fixed rod and drives the firing pin to contact with the switch contact piece, and the contact switch generates action; the reset torsion spring is sleeved on the fixed rod and is positioned at one side of the transmission plate 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 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 arranged at the bottom of a pit of an elevator shaft, one end of the supporting top arm is rotationally 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 rotationally connected with the pit bottom plate through a bracket, and the upper end of the jacking mechanism is rotationally connected with the middle part of the supporting top arm; the bottom of the lift car is provided with a lift car collision block, and the lift car collision block can push the supporting top arm 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 lift car collision block;
And the controller is connected with the contact switch and the jacking mechanism, and can control the jacking mechanism to stretch so as to jack the supporting jacking arm after the contact switch acts.
Thus, when a maintainer enters the elevator pit to overhaul the elevator, the elevator car stops at a non-bottom layer position, the elevator landing door is independently opened at the moment, the elevator landing door horizontally moves along the sill to touch the sensing pressing strip close to one side of the elevator landing door, the pressing strip reset spring is in a compressed state at the moment, the sensing pressing strip transmits pressure to the transmission plate, and then the firing pin is enabled to touch the switch of the blocking device, so that the car blocking device is in a working state and blocks the bottom of the elevator car, a large enough space is provided for maintenance personnel, the elevator car is prevented from descending, and the safety of the maintainer is ensured;
after maintenance personnel repair is completed, the elevator landing door is closed, the induction pressing bar close to one side of the elevator landing door is far away from the fixed rod under the action of the restoring force of the pressing bar restoring spring, the firing pin returns to the initial position along with the transmission plate, the blocking device switch is disconnected and is in an inactive state, and at the moment, the elevator can resume operation and normally move up and down in the pit.
Further, the jacking mechanism adopts an air 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 telescopic operation.
In this way, the blocking roof can better achieve blocking of the bottom of the car.
Further, a groove is formed in the lower side of the middle of the supporting top arm, wherein a pulley is further arranged at the upper end of the lifting mechanism, and the upper end of the lifting mechanism stretches into the groove to enable the pulley to be placed in the groove.
Thus, the jacking mechanism can better push the supporting jacking arms.
Further, the controller is a conversion type relay, the jacking mechanism adopts an electric push rod, a fixed contact of the relay is connected with the 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, wherein the power supply directions of the normally open movable contact group and the normally closed movable 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 jacking mechanism to reversely electrify, so that the jacking mechanism stretches out; when the contact switch is disconnected again, the relay restores the energizing direction of the lifting mechanism, so that the lifting mechanism is retracted.
Thus, the whole control loop structure is simpler and the stability is better.
Further, 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 controls the car blocking device through the controller.
Drawings
Fig. 1 is a schematic view of the bottom of the car of the present invention.
Fig. 2 is an enlarged schematic view of the structure of fig. 1a according to the present invention.
Fig. 3 is a schematic view of the structure of the present invention with both the car door and the elevator landing door open.
Fig. 4 is an enlarged schematic view of the structure of the present invention at B in fig. 3.
Fig. 5 is a schematic view of the structure of the C-C view of fig. 3 according to the present invention.
Fig. 6 is a schematic view of the structure of the present invention with only the elevator landing door open.
Fig. 7 is a schematic view of the structure of the D-D view of fig. 6 according to the present invention.
Fig. 8 is a schematic view of the car stop device of the present invention in a non-operating state.
Fig. 9 is a schematic view of the car stop device according to the present invention in an operating state.
Reference numerals 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 fixed rod 8; an induction batten 9; a hold-down bar return spring 10; a drive plate 11; a striker 12; a contact switch 13; car bump 14; a groove 15; a roller 16; a reset torsion spring 17; a fixing 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 described with reference to the drawings and examples.
Example 1: referring to fig. 1 to 9, a system for protecting safety of 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 door openings corresponding to floors, the bottom of the elevator shaft is provided with a pit, the inner side of the door opening is provided with an elevator landing door 3, and the system further comprises a door opening detection device, a car blocking device and a controller, wherein the door opening detection device is arranged on one side of the bottom door opening and comprises a fixed rod 8, two induction pressing strips 9, a pressing strip reset spring 10 and an induction control structure; the fixed rod 8 is horizontally arranged in the elevator hoistway 22, the length direction of the fixed rod is consistent with the opening and closing direction of the elevator landing door 3, one end of the fixed rod 8 is fixedly connected with the side wall of the elevator hoistway 22, the other end of the fixed rod extends into a gap between the elevator landing door 3 and the elevator car door 2, and the fixed rod 8 is positioned in the middle of the horizontal direction of the gap between the elevator landing door 3 and the elevator car door 2. The two induction pressing strips 9 are positioned on the left side or the right side of the fixed rod 8 and are respectively positioned between the fixed rod 8 and the elevator landing door 3 and the car door 2, wherein one end of the two induction pressing strips 9, which is close to the elevator landing door 3, is connected with the fixed rod 8, the other end of the two induction pressing strips extends towards the side wall direction of the elevator hoistway 22 and inclines towards the opposite direction to form a free end, the free ends of the two induction pressing strips 9 are respectively provided with a roller 16, and when the elevator landing door 3 and the car door 2 are simultaneously opened, the elevator landing door 3 and the car door 2 can be simultaneously contacted with the corresponding rollers 16. The pressing strip reset spring 10 is positioned between the two induction pressing strips 9, and two ends of the pressing strip reset 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 two induction press strips 9 and is rotationally 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 press strips 9; the transmission plate 11 and the switch contact 20 are positioned on the same side of the contact switch 13, a firing pin 12 is arranged on one side of the transmission plate, which is close to the contact switch 13, the firing pin 12 extends towards the contact switch 13 and forms dislocation with the switch contact 20, the firing pin 12 is positioned on one side of the switch contact 20, which is close to the elevator landing door 3, and a gap is reserved between the firing pin 12 and the switch contact 20, when the elevator landing door 3 presses the sensing pressing strip 9, the sensing pressing strip 9 can press the transmission plate 11, so that the transmission plate 11 rotates around the fixed rod 8 and drives the firing pin 12 to contact with the switch contact 20, and the contact switch 13 acts; the reset torsion spring 17 is sleeved on the fixed rod 8 and is positioned on one side of the transmission plate 11 away 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 fixed rod 8 through a fixed 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 arranged at the bottom of a pit of an elevator shaft 22, one end of the supporting top arm 5 is rotationally connected with the base 4, the other end of the supporting top arm 5 is connected with the blocking top plate 6, and the blocking top plate 6 can be in a horizontal state after rotating along with the supporting top arm 5; the lower end of the jacking mechanism 7 is rotationally connected with the bottom plate of the pit through a bracket, and the upper end of the jacking mechanism 7 is rotationally connected with the middle part of the supporting jacking arm 5, wherein the rotating axial lines of the supporting jacking arm 5 and the jacking mechanism 7 are horizontally arranged and mutually parallel, so that the supporting jacking arm 5 and the jacking mechanism 7 can both 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 by the extension of the jacking mechanism 7, so that the blocking top plate 6 rotates to be in a horizontal state and is opposite to the car collision block 14. The contact switch 13 and the jacking mechanism 7 are both connected with the controller 24, and when the contact switch 13 acts, the controller 24 can control the jacking mechanism 7 to extend so as to jack the supporting jacking arm 5.
As an embodiment, the blocking top plate 6 is rotatably connected with the supporting top arm 5, and a certain gap is formed between the lugs of the blocking top plate 6 and the supporting top arm 5, so that the blocking top plate 6 can rotate to a horizontal state along with the supporting top arm 5 after the supporting top arm 5 rotates upwards, so as to be opposite to the car collision block 14.
Thus, when a maintainer enters the elevator pit to overhaul the elevator, the elevator car stops at a non-bottom layer position, the elevator landing door is independently opened at the moment, the elevator landing door horizontally moves along the sill to touch the sensing pressing strip close to one side of the elevator landing door, the pressing strip reset spring is in a compressed state at the moment, the sensing pressing strip transmits pressure to the transmission plate, and then the firing pin is enabled to touch the switch of the blocking device, so that the car blocking device is in a working state and blocks the bottom of the elevator car, a large enough space is provided for maintenance personnel, the elevator car is prevented from descending, and the safety of the maintainer is ensured;
after maintenance personnel repair is completed, the elevator landing door is closed, the induction pressing bar close to one side of the elevator landing door is far away from the fixed rod under the action of the restoring force of the pressing bar restoring spring, the firing pin returns to the initial position along with the transmission plate, the blocking device switch is disconnected and is in an inactive state, and at the moment, the elevator can resume operation and normally move up and down 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 telescopic operation.
In this way, the blocking roof can better achieve blocking of the bottom of the car.
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 lifting mechanism 7 is also provided with a pulley 21, and the upper end of the lifting mechanism 7 stretches 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 arms.
The controller 24 is a conversion type relay, the jacking mechanism 7 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, wherein the power supply directions of the normally open movable contact group and the normally closed movable 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 jacking mechanism to reversely electrify, so that the jacking mechanism stretches out; when the contact switch is disconnected again, the relay restores the energizing direction of the lifting mechanism, so that the lifting mechanism is retracted.
Thus, the whole control loop structure is simpler and the stability is better.
The controller 24 is further electrically connected with the door opening detection system, and a signal receiver 23 is further arranged between the controller 24 and the door opening detection system, 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 for illustrating the technical solution of the present invention and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the present invention, and all such modifications and equivalents are included in the scope of the claims.
Claims (4)
1. The utility model provides a carry out safety protection's system 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, 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 hoistway, 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 hoistway, the other end of the fixed rod extends into a gap between the elevator landing door and the elevator car door, and the fixed rod is positioned in the middle of the gap between the elevator landing door and the elevator car door; the two induction pressing strips are positioned on the left side or the right side of the fixed rod and between the fixed rod and the elevator landing door and the elevator car door respectively, wherein one end of the two induction pressing strips, which is close to the elevator landing door, is connected with the fixed rod, the other end of the two induction pressing strips extends towards the side wall direction of the elevator hoistway and inclines towards the direction deviating from the direction, a free end is formed, the free ends of the two induction pressing strips are respectively provided with a roller, and when the elevator landing door and the elevator car door are simultaneously opened, the elevator landing door and the elevator car door can be simultaneously contacted with the corresponding rollers; the pressing strip reset spring is positioned between the two induction pressing strips, and two ends of the pressing strip reset 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, and the switch contact piece is vertically arranged; the transmission plate is horizontally arranged between the two induction press strips and is rotationally connected with the fixed rod through the 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 press strips; the transmission plate and the switch contact piece 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 forms dislocation with the switch contact piece, the firing pin is positioned on one side of the switch contact piece, which is close to the elevator landing door, and a gap is reserved between the firing pin and the switch contact piece, when the elevator landing door extrudes the induction pressing strip, the induction pressing strip can extrude the transmission plate, so that the transmission plate rotates around the fixed rod and drives the firing pin to contact with the switch contact piece, and the contact switch generates action; the reset torsion spring is sleeved on the fixed rod and is positioned at one side of the transmission plate 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 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 arranged at the bottom of a pit of an elevator shaft, one end of the supporting top arm is rotationally 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 rotationally connected with the pit bottom plate through a bracket, and the upper end of the jacking mechanism is rotationally connected with the middle part of the supporting top arm; the bottom of the lift car is provided with a lift car collision block, and the lift car collision block can push the supporting top arm 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 lift car collision block; the lower side of the middle part of the supporting top 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 stretches into the groove to enable the pulley to be arranged in the groove;
the controller is connected with the contact switch and the jacking mechanism, and can control the jacking mechanism to stretch to jack the supporting jacking arm after the contact switch acts; the controller is a conversion type relay, the jacking mechanism adopts an electric push rod, a static contact of the relay is connected with the 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, wherein the power supply directions of the normally open movable contact group and the normally closed movable 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 jacking mechanism to reversely electrify, so that the jacking mechanism stretches out; when the contact switch is disconnected again, the relay restores the energizing direction of the lifting mechanism, so that the lifting mechanism is retracted.
2. The system for safety protection of a pit elevator service personnel according to claim 1, wherein the jacking mechanism is a cylinder, a hydraulic cylinder or an electric telescopic mechanism.
3. The system for safety protection of pit elevator service personnel according to claim 2, wherein the electric telescopic mechanism is telescopic by using an electric cylinder or an electric push rod.
4. The system for protecting safety of a pit elevator service personnel according to claim 1, wherein a signal receiver is further electrically connected between the controller and the door opening detection system, and the contact switch sends an electrical signal to the signal receiver, and the signal receiver controls the car blocking device through the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204409.4A CN110745663B (en) | 2019-11-29 | 2019-11-29 | System for safety protection is carried out shallow pit elevator maintainer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204409.4A CN110745663B (en) | 2019-11-29 | 2019-11-29 | System for safety protection is carried out shallow pit elevator maintainer |
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| CN110745663B true CN110745663B (en) | 2024-05-28 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111847178A (en) * | 2020-08-05 | 2020-10-30 | 江苏宜美家电梯有限公司 | Pedal switch mechanism applied to platform elevator |
| 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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| CN110745663A (en) | 2020-02-04 |
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