CN213738097U - Automatic change shallow pit of elevator and overhaul protection device - Google Patents
Automatic change shallow pit of elevator and overhaul protection device Download PDFInfo
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- CN213738097U CN213738097U CN202022916766.8U CN202022916766U CN213738097U CN 213738097 U CN213738097 U CN 213738097U CN 202022916766 U CN202022916766 U CN 202022916766U CN 213738097 U CN213738097 U CN 213738097U
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Abstract
The utility model discloses an automatic change elevator shallow pit and overhaul protection device, a serial communication port, including transmission system and control system. When the elevator car needs to be overhauled, the automatic elevator shallow pit overhauling protection device can lift the elevator car, so that an overhauling height space meeting the safety overhauling requirement is formed between the bottom of the elevator car and a pit, and an overhauling person can conveniently enter the pit to overhaul; simultaneously, after the maintenance is accomplished, automatic elevator shallow pit overhauls protection device and is the recovery state, can not cause the influence to elevator car operation.
Description
Technical Field
The utility model relates to an elevator maintenance technical field, concretely relates to automatic change shallow pit of elevator overhauls protection device.
Background
With the continuous improvement of the technology, elevators are generally installed and used in modern buildings, the rapid development of the elevator industry is also driven, and the progress of the elevator maintenance technology becomes the focus of attention in the industry. However, when elevator projects are additionally installed on some old floors, due to 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 network, a septic tank and the like possibly exist below the selected position of the elevator, and therefore the elevator pit needs to be made into a shallow pit. To shallow pit elevator, the maintenance high space in elevator pit can not satisfy the safety inspection requirement, when actual overhaul, needs the maintainer to get into in the shallow pit, supports elevator car through simple devices such as steel pipe, and this has very big potential safety hazard when making the maintainer get into the pit and overhaul.
SUMMERY OF THE UTILITY MODEL
Not enough to the above that prior art exists, the utility model aims to provide an automatic change shallow pit of elevator overhauls protection device to the maintenance space height that solves shallow pit of elevator is not enough, and the maintainer gets into the problem that has the potential safety hazard when the shallow pit overhauls.
Solve the technical problem, the utility model discloses a following technical scheme:
an automatic elevator shallow pit overhaul protection device comprises a driving motor, a transmission mechanism and a supporting mechanism; the transmission mechanism comprises a transmission base, a transmission screw rod and a transmission member, and the supporting structure comprises a supporting base, an ejector rod, a supporting rod and a supporting plate. The driving motor, the transmission base and the supporting base are distributed on the ground of the elevator pit along a straight line, and the transmission base is located between the driving motor and the supporting base. One end of the transmission screw rod is connected with a motor shaft of the driving motor, and the other end of the transmission screw rod extends towards the direction of the supporting base. The transmission component is provided with a threaded hole matched with the transmission screw rod and is connected with the transmission screw rod in a threaded matching mode through the threaded hole. The transmission component is connected with the transmission base in a sliding fit manner and supports the transmission screw rod; one end of the supporting rod is rotatably connected with the supporting base, and the other end of the supporting rod is fixedly connected with the supporting plate. One end of the ejector rod is rotatably connected with the transmission member, the other end of the ejector rod is rotatably connected with a sliding block assembly, and the sliding block assembly is connected with the supporting rod in a sliding fit manner. In the initial state, the ejector rod is obliquely arranged, and one end of the ejector rod connected with the supporting rod is positioned above one end of the ejector rod connected with the transmission member.
Preferably, a first stop switch is provided on the support bar, the first stop switch being located between the slider assembly and the support plate and being capable of being triggered when the slider assembly is moved to the set position.
Preferably, a second stop switch is provided on the support bar, the second stop switch being located between the slider assembly and the support base, the second stop switch being capable of being triggered when the slider assembly is moved to a set position.
Preferably, the both sides of transmission base are the vertical curb plate that is equipped with respectively, still are equipped with a spout respectively along the axial of transmission lead screw on the both sides board in opposite directions the both sides of transmission component are equipped with a slip table respectively, the slip table is ingested in the spout to link to each other with curb plate sliding fit.
Preferably, a positioning device is further arranged on the transmission member, the positioning device comprises a positioning motor, a driving gear, a driven gear, a transmission screw rod, two positioning rods and a shell, the shell is fixedly connected with the transmission member, and the length direction of the shell is perpendicular to the axial direction of the transmission screw rod; a motor shaft of the positioning motor is arranged along the length direction of the shell, and the driving gear is fixedly connected with the motor shaft of the positioning motor; the driving screw is positioned in the shell, the length direction of the driving screw is consistent with that of the shell, the driven gear is sleeved in the middle of the driving screw and is fixedly connected with the driving screw, the driven gear is meshed with the driving gear, and the positioning motor can drive the driving screw to rotate through the driving gear and the driven gear; one end of each positioning rod is provided with a threaded hole matched with the transmission screw rod, the two positioning rods are in threaded fit connection with the two ends of the transmission screw rod through the threaded holes, and the other ends of the two positioning rods penetrate through the two ends of the shell and then extend out of the shell; the cross section of the positioning rod is polygonal, correspondingly, two ends of the shell are respectively provided with a polygonal through hole which is consistent with the positioning rod, and the positioning rod penetrates through the through hole and then extends out of the shell; and when the transmission component moves to the supporting position, the two positioning rods can be driven by the positioning motor to pass through the positioning holes.
Preferably, a limit block is arranged at one end of the support rod close to the support plate, and the limit block can prevent the sliding block assembly from continuously sliding.
Preferably, the support rod is provided with a guide groove, the guide groove is arranged along the length direction of the support rod, two ends of the guide groove are close to two ends of the support rod, and the section of the guide groove is in a T shape. The two ends of the sliding block component are respectively provided with a sliding plate, the section of the sliding plate is consistent with that of the guide groove, and the sliding block component is connected with the sliding groove in a sliding fit mode through the sliding plate.
Preferably, at least one bearing is further arranged on one side, facing the bottom of the guide groove, of the slider assembly, and the bearing is connected with the slider assembly in a rotating mode and attached to two side walls of the guide groove.
Compared with the prior art, the utility model has the advantages of as follows:
when the elevator car needs to be overhauled, the automatic elevator shallow pit overhauling protection device can prop up the elevator car, so that an overhauling height space meeting the safety overhauling requirement is formed between the bottom of the elevator car and a pit, and an overhauling person can conveniently enter the pit to overhaul; simultaneously, after the maintenance is accomplished, automatic elevator shallow pit overhauls protection device and is the recovery state, can not cause the influence to elevator car operation.
Drawings
Fig. 1 is the utility model relates to an automatic change elevator shallow pit overhauls protection device initial condition's schematic structure diagram.
Fig. 2 is the utility model relates to an automatic change elevator shallow pit overhauls protection device operating condition's schematic structure diagram.
Fig. 3 is a schematic structural view of the slider assembly.
Fig. 4 is a schematic structural view of the transmission member.
Fig. 5 is a schematic structural view of the transmission base.
Fig. 6 is the structural schematic diagram of the automatic elevator shallow pit overhaul protection system.
Fig. 7 is a schematic structural view of the positioning member when in positioning.
Fig. 8 is a schematic structural view when the positioning member is retracted.
In the figure: the elevator landing door locking device comprises a driving motor 1, a transmission base 2, a transmission screw rod 3, a transmission component 4, a support base 5, a push rod 6, a support rod 7, a support plate 8, a sliding block assembly 9, a limiting block 10, a guide rail 11, a sliding table 12, a positioning motor 13, a driving gear 14, a driven gear 15, a transmission screw rod 16, a positioning rod 17, a shell 18, a clamping plate 19, a bearing 20, an elevator landing door lock 21, a touch plate 22, a start-stop switch 23, a first stop switch 24, a second stop switch 25, a positioning hole 26, an elevator landing door 27 and an elevator car 28.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Automatic change elevator shallow pit and overhaul protection device
The protection device comprises a driving motor 1, a transmission mechanism and a supporting mechanism. The transmission mechanism comprises a transmission base 2, a transmission screw rod 3 and a transmission member 4, and the supporting structure comprises a supporting base 5, an ejector rod 6, a supporting rod 7 and a supporting plate 8. The driving motor, the transmission base and the supporting base are distributed on the ground of the elevator pit along a straight line, and the transmission base is located between the driving motor and the supporting base. One end of the transmission screw rod is connected with a motor shaft of the driving motor, and the other end of the transmission screw rod extends towards the direction of the supporting base. The transmission component is provided with a threaded hole matched with the transmission screw rod and is connected with the transmission screw rod in a threaded matching mode through the threaded hole. The transmission component is connected with the transmission base in a sliding fit manner and supports the transmission screw rod; one end of the supporting rod is rotatably connected with the supporting base, and the other end of the supporting rod is fixedly connected with the supporting plate. One end of the ejector rod is rotatably connected with the transmission member, the other end of the ejector rod is rotatably connected with a sliding block assembly 9, and the sliding block assembly is connected with the supporting rod in a sliding fit manner. In the initial state, the ejector rod is obliquely arranged, and one end of the ejector rod connected with the supporting rod is positioned above one end of the ejector rod connected with the transmission member.
In specific implementation, fig. 1 shows one embodiment of the present invention, and the protection device of the present invention can control the start and stop of the driving motor through the motor controller, and can control the rotation time of the driving motor, so that the support plate lifts the elevator car to the height required for maintenance; the start and stop of the driving motor can also be realized by connecting a plurality of switches and a controller in series on a control loop of the driving motor, for example, the start and stop of the driving motor can be controlled by the start and stop switch, two limit switches connected with the controller are arranged on the supporting rod, and the working and running time of the driving motor is controlled by the controller and the two limit switches, so that the elevator car can be lifted to the height required by maintenance within the running time of the driving motor; the protection device can also be connected with an elevator control system, and the lifting height of the elevator car can be adjusted through the elevator control system. The protection device can also be used in other places needing to be supported.
When needs get into elevator car pit and overhaul, operating personnel accessible motor controller or elevator control system start driving motor, driving motor's motor shaft drives the transmission lead screw and rotates, the direction that driving member kept away from driving motor moves, and promote the ejector pin and rotate, make the direction of slider subassembly orientation backup pad remove, and upwards lift up elevator car through bracing piece and backup pad, when highly satisfying the maintenance needs between elevator car bottom and the pit, motor controller or elevator control system close driving motor, operating personnel gets into the pit and overhauls the operation. When the overhaul is finished, an operator can start the driving motor through the motor controller or the elevator control system, a motor shaft of the driving motor drives the transmission screw rod to rotate in the direction opposite to the previous direction, the transmission component moves in the direction close to the driving motor and pulls the ejector rod to rotate, so that the sliding block component moves in the direction of the supporting base, when the elevator car is put down and reset, the motor controller or the elevator control system closes the driving motor, and the ejector rod and the supporting rod recover to the initial state.
In one embodiment, a first stop switch 24 is provided on the support bar between the slider assembly and the support plate that is capable of being triggered when the slider assembly is moved to a set position. A second stop switch 25 is provided on the support bar, located between the slider assembly and the support base, and is capable of being triggered when the slider assembly moves to a set position. The first stop switch and the second stop switch are connected in series in a power supply loop of the driving motor and can be triggered by the movement of the sliding block assembly, so that the running time of the driving motor is controlled.
In an embodiment, both sides of the transmission base are respectively vertically provided with a side plate, a sliding groove 11 is further respectively arranged on one side of each of the two opposite side plates along the axial direction of the transmission screw rod, two sides of the transmission component are respectively provided with a sliding table 12, and the sliding tables are ingested into the sliding grooves and are connected with the side plates in a sliding fit manner. The transmission component is also provided with a positioning device, the positioning device comprises a positioning motor 13, a driving gear 14, a driven gear 15, a transmission screw 16, two positioning rods 17 and a shell 18, the shell is fixedly connected with the transmission component, and the length direction of the shell is vertical to the axial direction of the transmission screw; a motor shaft of the positioning motor is arranged along the length direction of the shell, and the driving gear is fixedly connected with the motor shaft of the positioning motor; the driving screw is positioned in the shell, the length direction of the driving screw is consistent with that of the shell, the driven gear is sleeved in the middle of the driving screw and is fixedly connected with the driving screw, the driven gear is meshed with the driving gear, and the positioning motor can drive the driving screw to rotate through the driving gear and the driven gear; one end of each positioning rod is provided with a threaded hole matched with the transmission screw rod, the two positioning rods are in threaded fit connection with the two ends of the transmission screw rod through the threaded holes, and the other ends of the two positioning rods penetrate through the two ends of the shell and then extend out of the shell; the cross section of the positioning rod is polygonal, correspondingly, two ends of the shell are respectively provided with a polygonal through hole which is consistent with the positioning rod, and the positioning rod penetrates through the through hole and then extends out of the shell; and the corresponding positions on the two side plates of the transmission base are respectively provided with a positioning hole 26, when the transmission component moves to the supporting position, the two positioning rods can be driven by a positioning motor to pass through the positioning holes, and the positioning holes are positioned above the sliding chute 11.
In the initial state, two positioning rods in the positioning device extend out of the through hole in the shell and penetrate through the positioning holes in the transmission base to fix the transmission component. When the transmission component runs to a preset position, the motor controller starts the positioning motor and controls the running time of the positioning motor, so that the positioning rod passes through the positioning hole in the transmission base and moves towards the direction close to each other, namely the positioning rod retracts into the shell, the limitation on the position of the transmission component is cancelled, and the transmission component can move along the transmission screw rod; similarly, when the transmission component needs to be limited, the motor controller starts the positioning motor and controls the operation time of the positioning motor, so that the positioning rod passes through the positioning hole in the transmission base and moves towards the direction away from each other, namely, the positioning rod extends out of the shell and passes through the positioning hole, and the position of the transmission component is fixed. This can also be done by connecting a number of switches and controllers in series on the control loop of the drive motor, or by switching in the elevator control system.
In an embodiment, the supporting rod is close to one end of the supporting plate, a limiting block 10 is further arranged, the sliding block assembly can be prevented from continuously sliding, the position of the limiting block is the best supporting point of the supporting rod, the elevator car can be lifted to the height meeting the maintenance requirement, and the most stable supporting effect can be achieved.
In one embodiment, the support rod is provided with a guide groove, the guide groove is arranged along the length direction of the support rod, two ends of the guide groove are close to two ends of the support rod, and the section of the guide groove is T-shaped; and two ends of the sliding block component are respectively provided with a sliding plate 19, the section of the sliding plate is consistent with that of the guide groove, and the sliding block component is connected with the sliding groove in a sliding fit manner through the sliding plate. And at least one bearing 20 is further arranged on one side of the sliding block component, which faces the bottom of the guide groove, is rotatably connected with the sliding block component and is attached to two side walls of the guide groove, and a deep groove ball bearing is preferably selected as the bearing.
Second, automatic change elevator shallow pit and overhaul protection system
The automatic elevator shallow pit maintenance protection device comprises an automatic elevator shallow pit maintenance protection device and a bottom elevator door, wherein the bottom elevator door is provided with a layer door lock 21, the layer door lock is provided with a mandrel, and the layer door can be opened by rotating the mandrel; the start-stop switch is positioned on one side of the layer door lock and connected with a control loop of the driving motor, and the other end of the touch plate can trigger the start-stop switch to be closed in the rotating process of the touch plate, so that the driving motor is started.
When the power supply device is specifically implemented, the start-stop switch can be a movable switch, the first stop switch and the second stop switch can be movable switches, and the start-stop switch, the first stop switch and the second stop switch are connected in series in a power supply loop of the driving motor.
When needing to get into elevator car pit and overhaul, operating personnel operates elevator layer door lock, layer door lock rotates and drives the touch board and triggers and open the stop switch, start driving motor, driving motor's motor shaft drives the rotation of transmission lead screw, the transmission component moves towards the direction of keeping away from driving motor, and promote the ejector pin and rotate, make sliding block set move towards the direction of first stop switch, and through bracing piece and backup pad with elevator car 28 jack-up that makes progress, make the height between elevator car bottom and the pit satisfy the maintenance needs, simultaneously, sliding block set slides to stopper department, and trigger first stop switch, close driving motor, operating personnel gets into the pit and overhauls the operation.
When an operator leaves the pit, the operator resets and rotates the elevator landing door lock and drives the touch plate to trigger the start-stop switch, the driving motor is started, the motor shaft of the driving motor drives the transmission screw rod to rotate in the direction opposite to the previous direction, the transmission member moves in the direction close to the driving motor and pulls the ejector rod to rotate, the sliding block assembly moves in the direction of the second stop switch and puts down the elevator car to reset, meanwhile, the sliding block assembly triggers the second stop switch to stop the driving motor, and the ejector rod and the support rod recover to the initial state.
When the automatic elevator shallow pit overhauling protection device is adopted, and the positioning device is arranged on the automatic elevator shallow pit overhauling protection device, a controller is also arranged in the positioning motor and used for controlling the operation time of the positioning motor; the start-stop switch is connected with the positioning motor circuit and used for starting the positioning motor; the first stop switch is connected with the positioning motor circuit and used for starting the positioning motor; and the second stop switch is connected with the positioning motor circuit and used for starting the positioning motor.
In the initial state, one ends of the two positioning rods, which are far away from the connection part of the two positioning rods and the transmission screw rod, respectively penetrate through the positioning holes in the transmission base, and the controller is internally provided with positioning motor running time for controlling the moving distance of the positioning rods, so that the positioning rods can extend out of or retract into the shell from the positioning holes in the transmission base, and the transmission component is limited and fixed on the transmission base.
When needing to overhaul, rotate the layer lock, touch the board and trigger and open and stop the switch, the motor shaft of location motor begins forward rotation to drive the drive screw through driving gear and driven gear and rotate, make the locating lever pass on the transmission base rather than the locating hole that corresponds and move towards the direction that is close to each other, location motor stall, the length direction removal of transmission screw can be followed to the drive member this moment.
When the support rod jacks the elevator car upwards, the distance between the bottom of the elevator car and the pit meets the maintenance requirement, the sliding block assembly triggers the first stop switch, the motor shaft of the positioning motor starts to rotate reversely, the driving screw is driven to rotate through the driving gear and the driven gear, the positioning rod moves towards the direction far away from each other and penetrates through the positioning hole corresponding to the positioning rod on the transmission base, the positioning motor stops running, and the transmission component is limited and fixed at the moment.
After the overhaul is finished, the layer door lock is reset, the touch plate triggers the start-stop switch, the motor shaft of the positioning motor starts to rotate in the forward direction, the driving gear and the driven gear drive the transmission screw to rotate, the positioning rod penetrates through the positioning hole corresponding to the positioning rod on the transmission base and moves towards the direction close to each other, the positioning motor stops running, and the transmission component can move along the length direction of the transmission screw at the moment.
When the elevator car restores to the original position, the sliding block assembly triggers the second stop switch, the motor shaft of the positioning motor starts to rotate reversely, the driving gear and the driven gear drive the transmission screw to rotate, the positioning rods move towards the direction away from each other and penetrate through the positioning holes, corresponding to the positioning rods, in the transmission base, the positioning motor stops running, and the transmission component is limited and fixed at the moment.
The present invention is not limited to the above embodiments, and the same or similar structures as those of the above embodiments of the present invention are all within the protection scope of the present invention.
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 those modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all should be covered in the scope of the claims of the present invention.
Claims (8)
1. An automatic elevator shallow pit overhaul protection device is characterized by comprising a driving motor (1), a transmission mechanism and a supporting mechanism; the transmission mechanism comprises a transmission base (2), a transmission screw rod (3) and a transmission member (4), and the support mechanism comprises a support base (5), an ejector rod (6), a support rod (7) and a support plate (8); the driving motor, the transmission base and the support base are linearly distributed on the ground of the elevator pit, and the transmission base is positioned between the driving motor and the support base;
one end of the transmission screw rod is connected with a motor shaft of the driving motor, and the other end of the transmission screw rod extends towards the direction of the supporting base; the transmission component is provided with a threaded hole matched with the transmission screw rod and is connected with the transmission screw rod in a threaded matching way through the threaded hole; the transmission component is connected with the transmission base in a sliding fit manner and supports the transmission screw rod; one end of the supporting rod is rotatably connected with the supporting base, and the other end of the supporting rod is fixedly connected with the supporting plate; one end of the ejector rod is rotationally connected with the transmission member, the other end of the ejector rod is rotationally connected with a sliding block component (9), and the sliding block component is connected with the supporting rod in a sliding fit manner;
in the initial state, the ejector rod is obliquely arranged, and one end of the ejector rod connected with the supporting rod is positioned above one end of the ejector rod connected with the transmission member.
2. The automated elevator shallow pit inspection and protection device of claim 1, wherein a first stop switch (24) is provided on the support bar, the first stop switch being located between the slider assembly and the support plate and being capable of being triggered when the slider assembly is moved to a set position.
3. The automated elevator shallow pit inspection and protection device of claim 2, wherein a second stop switch (25) is provided on the support bar, the second stop switch being located between the slider assembly and the support base and being capable of being triggered when the slider assembly is moved to a set position.
4. The automatic elevator shallow pit overhaul protection device as claimed in claim 1, wherein two sides of the transmission base are vertically provided with a side plate respectively, one opposite side of the two side plates is further provided with a sliding groove (11) along the axial direction of the transmission screw rod respectively, two sides of the transmission member are provided with a sliding table (12) respectively, and the sliding table is taken into the sliding groove and is connected with the side plates in a sliding fit manner.
5. The automatic elevator shallow pit overhaul protection device as claimed in claim 4, wherein a positioning device is further arranged on the transmission member, the positioning device comprises a positioning motor (13), a driving gear (14), a driven gear (15), a transmission screw (16), two positioning rods (17) and a housing (18), the housing is fixedly connected with the transmission member, and the length direction of the housing is perpendicular to the axial direction of the transmission screw; a motor shaft of the positioning motor is arranged along the length direction of the shell, and the driving gear is fixedly connected with the motor shaft of the positioning motor; the driving screw is positioned in the shell, the length direction of the driving screw is consistent with that of the shell, the driven gear is sleeved in the middle of the driving screw and is fixedly connected with the driving screw, the driven gear is meshed with the driving gear, and the positioning motor can drive the driving screw to rotate through the driving gear and the driven gear; one end of each positioning rod is provided with a threaded hole matched with the transmission screw rod, the two positioning rods are in threaded fit connection with the two ends of the transmission screw rod through the threaded holes, and the other ends of the two positioning rods penetrate through the two ends of the shell and then extend out of the shell; the cross section of the positioning rod is polygonal, correspondingly, two ends of the shell are respectively provided with a polygonal through hole which is consistent with the positioning rod, and the positioning rod penetrates through the through hole and then extends out of the shell; and the corresponding positions on the two side plates of the transmission base are respectively provided with a positioning hole (26), and when the transmission component moves to the supporting position, the two positioning rods can be driven by the positioning motor to pass through the positioning holes.
6. The automatic elevator shallow pit overhaul protection device as claimed in claim 1, wherein a limit block (10) is further provided at an end of the support rod close to the support plate to prevent the slider assembly from sliding further.
7. The automatic elevator shallow pit overhaul protection device as claimed in claim 1, wherein the support rod is provided with a guide groove, the guide groove is arranged along the length direction of the support rod, two ends of the guide groove are close to two ends of the support rod, and the section of the guide groove is T-shaped; and two ends of the sliding block component are respectively provided with a sliding plate (19), the section of the sliding plate is consistent with that of the guide groove, and the sliding block component is connected with the sliding groove in a sliding fit manner through the sliding plate.
8. The automated elevator shallow pit inspection and protection device of claim 7, wherein at least one bearing (20) is further provided on a side of the slider assembly facing the bottom of the guide slot, the bearing being rotatably connected to the slider assembly and engaging two sidewalls of the guide slot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022916766.8U CN213738097U (en) | 2020-12-08 | 2020-12-08 | Automatic change shallow pit of elevator and overhaul protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022916766.8U CN213738097U (en) | 2020-12-08 | 2020-12-08 | Automatic change shallow pit of elevator and overhaul protection device |
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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 |
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2020
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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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