CN107500083B - Automatic accurate leveling device of hydraulic elevator - Google Patents
Automatic accurate leveling device of hydraulic elevator Download PDFInfo
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- CN107500083B CN107500083B CN201710970253.5A CN201710970253A CN107500083B CN 107500083 B CN107500083 B CN 107500083B CN 201710970253 A CN201710970253 A CN 201710970253A CN 107500083 B CN107500083 B CN 107500083B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/04—Kinds or types of lifts in, or associated with, buildings or other structures actuated pneumatically or hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/36—Means for stopping the cars, cages, or skips at predetermined levels
- B66B1/40—Means for stopping the cars, cages, or skips at predetermined levels and for correct levelling at landings
- B66B1/405—Means for stopping the cars, cages, or skips at predetermined levels and for correct levelling at landings for hydraulically actuated elevators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/0423—Driving gear ; Details thereof, e.g. seals actuated pneumatically or hydraulically
-
- 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
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Computer Networks & Wireless Communication (AREA)
- Civil Engineering (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
The invention discloses an automatic accurate leveling device of a hydraulic elevator, wherein high-pressure hydraulic oil is arranged in an energy accumulator, an interface of the energy accumulator is connected in series with an upper leveling switch hydraulic valve and then is communicated with an oil supply pipe, a lower leveling switch hydraulic valve is connected in series with an oil return pipe, an upper leveling photoelectric switch and a lower leveling photoelectric switch are respectively arranged on a lift car and are respectively used for detecting whether the lift car is higher than a standard leveling position and lower than the standard leveling position, the upper leveling photoelectric switch controls the on-off of the upper leveling switch hydraulic valve through an upper leveling control relay, and the lower leveling photoelectric switch controls the on-off of the lower leveling switch hydraulic valve through a lower leveling control relay. According to the invention, the photoelectric switch, the leveling control relay and the leveling switch hydraulic valve are arranged to jointly form an automatic control circuit, so that the elevator car can be automatically repaired when the elevator car is higher or lower than the standard leveling position in the leveling process, thereby realizing the function of accurate leveling, and a gate reporting device is not needed, so that the cost is saved.
Description
Technical Field
The invention relates to a local structure of a hydraulic elevator, in particular to an automatic accurate leveling device of the hydraulic elevator.
Background
The hydraulic elevator is an elevator driven by hydraulic pressure, and the hydraulic power source is used for making the plunger move linearly by pressing oil into the oil cylinder, and the car is directly or indirectly moved by a steel wire rope.
Compared with traction elevators, hydraulic elevators have liquid expansion and contraction factors in addition to wire rope expansion and contraction factors, so it is not easy for the hydraulic elevators to achieve accurate leveling.
The existing hydraulic elevator only uses the band brake to realize the leveling function, the mechanical braking leveling mode is difficult to realize accurate leveling due to factors such as expansion and contraction of liquid, so that a large error is caused after an elevator car stops, inconvenience is caused for passengers to get in and out of the elevator car, and safety accidents can be caused even in serious cases.
Disclosure of Invention
The invention aims to solve the problems and provide an automatic accurate leveling device for a hydraulic elevator, which can realize accurate leveling of an elevator car.
The invention realizes the above purpose through the following technical scheme:
the automatic accurate leveling device of the hydraulic elevator comprises a lift car, a hydraulic cylinder, an oil pump and an oil tank, wherein an oil inlet of the oil pump is connected with the oil tank, an oil outlet of the oil pump is connected with the hydraulic cylinder, a piston rod of the hydraulic cylinder is connected with the lift car, an oil supply pipe is arranged between the oil outlet of the oil pump and the hydraulic cylinder, and an oil return pipe is arranged between the hydraulic cylinder and the oil tank; the hydraulic elevator automatic leveling device comprises an upper leveling photoelectric switch, a lower leveling photoelectric switch, an upper leveling control relay, a lower leveling control relay, an upper leveling switch hydraulic valve, a lower leveling switch hydraulic valve and an energy accumulator, wherein high-pressure hydraulic oil is arranged in the energy accumulator, an interface of the energy accumulator is connected with a first end of the upper leveling switch hydraulic valve, a second end of the upper leveling switch hydraulic valve is communicated with the oil supply pipe, and the lower leveling switch hydraulic valve is connected in series on the oil return pipe; the upper flat photoelectric switch is arranged on the car and used for detecting whether the car is higher than a standard flat position, and the lower flat photoelectric switch is arranged on the car and used for detecting whether the car is lower than the standard flat position; the output signal of the upper flat layer photoelectric switch controls the on-off of a coil power supply of the upper flat layer control relay, the contact of the upper flat layer control relay controls the on-off of the coil power supply of the upper flat layer switch hydraulic valve, the output signal of the lower flat layer photoelectric switch controls the on-off of a coil power supply of the lower flat layer control relay, and the contact of the lower flat layer control relay controls the on-off of the coil power supply of the lower flat layer switch hydraulic valve.
In the structure, the upper leveling photoelectric switch, the lower leveling photoelectric switch, the upper leveling control relay, the lower leveling control relay, the upper leveling switch hydraulic valve and the lower leveling switch hydraulic valve jointly form an automatic control circuit, when the elevator car is higher than the standard leveling position, the power supply of the coil of the upper leveling switch hydraulic valve can be connected, the corresponding oil return pipe is connected, so that the elevator car can descend, when the elevator car descends below the standard leveling position, the power supply of the coil of the lower leveling switch hydraulic valve can be connected, the corresponding energy accumulator can further pressurize the oil pressure in the oil supply pipe, and the elevator car can ascend; the oil pressure in the accumulator is higher than the oil pressure in the oil supply pipe, so that the elevator car can be quickly stopped and lifted when descending; the standard leveling position is the position where the surface of the inner bottom plate of the car is just flush with the surface of the corresponding floor when the car stops, and a certain error range can be designed when the standard leveling position is set.
Specifically, the signal output end of the upper flat layer photoelectric switch outputs a high level when the car is not higher than a standard flat layer position and outputs a low level when the car is higher than the standard flat layer position, the signal output end of the upper flat layer photoelectric switch is connected with the first end of the coil of the upper flat layer control relay, and the first end of the normally closed contact of the upper flat layer control relay is connected with the first end of the coil of the upper flat layer switch hydraulic valve; the signal output end of the lower flat layer photoelectric switch outputs a high level when the car is not lower than a standard flat layer position and outputs a low level when the car is lower than the standard flat layer position, the signal output end of the lower flat layer photoelectric switch is connected with the first end of a coil of the lower flat layer control relay, and the first end of a normally closed contact of the lower flat layer control relay is connected with the first end of the coil of the lower flat layer switch hydraulic valve; the positive power input end of the upper flat layer photoelectric switch, the second end of the normally closed contact of the upper flat layer control relay, the positive power input end of the lower flat layer photoelectric switch, the second end of the normally closed contact of the lower flat layer control relay and the positive output end of the flat layer control direct current power supply are connected with each other, and the negative power input end of the upper flat layer photoelectric switch, the second end of the coil of the upper flat layer control relay, the second end of the coil of the upper flat layer switch hydraulic valve, the negative power input end of the lower flat layer photoelectric switch, the second end of the coil of the lower flat layer control relay, the second end of the coil of the lower flat layer switch hydraulic valve and the negative output end of the flat layer control direct current power supply are connected with each other.
Further, in order to automatically charge and boost the pressure when the oil pressure in the accumulator is insufficient and automatically stop charging the oil after boosting, the hydraulic elevator automatic leveling device further comprises an energy storage control relay, an upper limit hydraulic pressure relay, a lower limit hydraulic pressure relay, a hydraulic control one-way valve and an electromagnetic reversing valve, wherein an oil charging pipe is connected between an oil outlet of the oil pump and an interface of the accumulator in a communicated manner, the upper limit hydraulic pressure relay and the lower limit hydraulic pressure relay are respectively arranged on the oil charging pipe and are respectively used for detecting whether the oil pressure in the accumulator is higher than the upper limit pressure and lower than the lower limit pressure, a normally closed contact of the upper limit hydraulic pressure relay is closed when the pressure in the accumulator is not higher than the upper limit pressure and is opened when the pressure in the accumulator is higher than the upper limit pressure, a normally open contact of the lower limit hydraulic pressure relay is opened when the pressure in the accumulator is lower than the lower limit pressure, and the electromagnetic control one-way valve is arranged between a connection position between the oil charging pipe and the oil supply pipe and the electromagnetic control valve in the upper limit hydraulic control valve in series; the normally open contact of the lower limit hydraulic pressure relay is connected in parallel with the first normally open contact of the energy storage control relay and then is connected in series with the normally closed contact of the upper limit hydraulic pressure relay and the coil of the energy storage control relay to form an energy storage control circuit, the normally closed contact of the energy storage control relay is connected in series with the coil of the electromagnetic reversing valve to form an oil supply control circuit, and two ends of the energy storage control circuit and two ends of the oil supply control circuit are respectively connected with the flat layer control direct current power supply correspondingly; the second normally open contact of the energy storage control relay is connected with the coil of the contactor in series, and the normally open contact of the contactor is connected with the power input end of the motor of the oil pump in series.
The invention has the beneficial effects that:
according to the invention, the automatic control circuit is formed by arranging the upper and lower leveling photoelectric switches, the upper and lower leveling control relays and the upper and lower leveling switch hydraulic valves, so that the elevator car can be automatically repaired when the elevator car is higher or lower than the standard leveling position in the leveling process, thereby realizing the function of accurate leveling, solving the problem that the elevator car cannot be accurately leveled due to the expansion of hydraulic elevator liquid, and saving the cost without a gate reporting device.
Drawings
Fig. 1 is a schematic diagram of an oil circuit structure of an automatic accurate leveling device of a hydraulic elevator, and a schematic diagram of a circuit control principle is shown in the diagram;
fig. 2 is one of the circuit diagrams of the automatic accurate leveling device of the hydraulic elevator according to the present invention;
fig. 3 is a second circuit diagram of the automatic accurate leveling device for a hydraulic elevator according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, 2 and 3, the hydraulic elevator of the present invention comprises a car 1, a hydraulic cylinder 2, an oil pump 21 and an oil tank 22, wherein an oil inlet of the oil pump 21 is connected with the oil tank 22 (generally placed directly in the oil tank 22), an oil outlet of the oil pump 21 is connected with the hydraulic cylinder 2, a piston rod of the hydraulic cylinder 2 is connected with the car 1, an oil supply pipe (not labeled in the figure) is arranged between the oil outlet of the oil pump 21 and the hydraulic cylinder 2, and an oil return pipe (not labeled in the figure) is arranged between the hydraulic cylinder 2 and the oil tank 22; the automatic accurate leveling device of the hydraulic elevator comprises an upper leveling photoelectric switch 5, a lower leveling photoelectric switch 4, an upper leveling control relay 7, namely K1, a lower leveling control relay 6, namely K2, an upper leveling switch hydraulic valve 15, a lower leveling switch hydraulic valve 8, an energy accumulator 11, an energy storage control relay 10, namely K3, an upper limit hydraulic pressure relay 12, a lower limit hydraulic pressure relay 13, a hydraulic control one-way valve 17 and an electromagnetic reversing valve 18, wherein high-pressure hydraulic oil with oil pressure higher than oil pressure in an oil supply pipe is arranged in the energy accumulator 11, an interface of the energy accumulator 11 is connected with a first end of the upper leveling switch hydraulic valve 15, a second end of the upper leveling switch hydraulic valve 15 is communicated with the oil supply pipe, and the lower leveling switch hydraulic valve 8 is connected in series on the oil return pipe; an oil filling pipe (not marked in the figure) is connected between an oil outlet of the oil pump 21 and an interface of the accumulator 11 in a communicating way, an upper limit hydraulic pressure relay 12 and a lower limit hydraulic pressure relay 13 are respectively arranged on the oil filling pipe and are respectively used for detecting whether the oil pressure in the accumulator 11 is higher than the upper limit pressure and lower than the lower limit pressure, a normally closed contact of the upper limit hydraulic pressure relay 12 is closed when the pressure in the accumulator 11 is not higher than the upper limit pressure and is opened when the pressure in the accumulator 11 is higher than the upper limit pressure, a normally open contact of the lower limit hydraulic pressure relay is opened when the pressure in the accumulator 11 is not lower than the lower limit pressure and is closed when the pressure in the accumulator 11 is lower than the lower limit pressure, and a hydraulic control one-way valve 17 controlled to be opened and closed by an electromagnetic reversing valve 18 is arranged on the oil supply pipe between a connecting position between the oil filling pipe and the oil supply pipe and the hydraulic cylinder 2 in series; the upper flat layer photoelectric switch 5 is arranged on the car 1 and is used for detecting whether the car 1 is higher than the standard flat layer position, and the lower flat layer photoelectric switch 4 is arranged on the car 1 and is used for detecting whether the car 1 is lower than the standard flat layer position; the signal output end of the upper flat layer photoelectric switch 5 outputs a high level when the car 1 is not higher than the standard flat layer position and outputs a low level when the car 1 is higher than the standard flat layer position, the signal output end of the upper flat layer photoelectric switch 5 is connected with the first end of the coil of the upper flat layer control relay 7, namely K1, and the first end of the normally closed contact K1' of the upper flat layer control relay 7, namely K1, is connected with the first end of the coil of the upper flat layer switch hydraulic valve 15; the signal output end of the lower flat layer photoelectric switch 4 outputs a high level when the car 1 is not lower than the standard flat layer position and outputs a low level when the car 1 is lower than the standard flat layer position, the signal output end of the lower flat layer photoelectric switch 4 is connected with the first end of a coil of the lower flat layer control relay 6, namely K2, and the first end of a normally closed contact K2' of the lower flat layer control relay 6, namely K2, is connected with the first end of a coil of the lower flat layer switch hydraulic valve 8; the normally open contact of the lower limit hydraulic pressure relay 13 is connected in parallel with the first normally open contact K3' of the energy storage control relay 10, namely K3, and then is connected in series with the normally closed contact of the upper limit hydraulic pressure relay 12 and the coil of the energy storage control relay 10, namely K3, so as to form an energy storage control circuit, and the normally closed contact K3' ' of the energy storage control relay 10, namely K3, is connected in series with the coil of the electromagnetic reversing valve 18 so as to form an oil supply control circuit; the energy storage control relay 10, namely a second normally open contact K3'' of the K3, is connected with a coil of the contactor KM in series, a normally open contact KM 'of the contactor KM is connected with a power input end of a motor 19 of the oil pump 21 in series, a three-phase power supply comprising U, V, W fire wires is adopted in FIG. 3, two fire wires V, W are respectively connected at two ends of the energy storage control relay 10, namely the second normally open contact K3' 'of the K3, after being connected with the coil of the contactor KM in series, and three normally open contacts KM' are respectively connected with three fire wires U, V, W of the power input end of the motor 19 in series; the positive power input end of the upper flat photoelectric switch 5, the second end of the upper flat control relay 7, namely the normally closed contact K1 'of K1, the positive power input end of the lower flat photoelectric switch 4, the second end of the lower flat control relay 6, namely the normally closed contact K2' of K2, and the positive output end of the flat control direct current power DC are mutually connected, and the negative power input end of the upper flat photoelectric switch 5, the second end of the upper flat control relay 7, namely the coil of K1, the second end of the coil of the upper flat switch hydraulic valve 15, the negative power input end of the lower flat photoelectric switch 4, the second end of the coil of the lower flat control relay 6, namely the coil of K2, the second end of the coil of the lower flat switch hydraulic valve 8, and the negative output end of the flat control direct current power DC are mutually connected; and two ends of the energy storage control circuit and two ends of the oil supply control circuit are respectively and correspondingly connected with the positive electrode output end and the negative electrode output end of the flat layer control direct current power supply DC.
The oil pressure gauge 3, the first check valve 16, the second check valve 14 and the third check valve 20 are also shown in fig. 1, and these components and the connecting mechanism are all conventional components and connecting structures adopted by the hydraulic elevator, which are not described herein, the two-way regulating valve 9 is also shown in fig. 1, and is also a conventional component, the oil inlet and the oil outlet of the two-way regulating valve 9 are all connected in series on the oil supply pipe and the oil outlet of the two-way regulating valve is connected with the interface of the hydraulic cylinder 2, the oil return port of the two-way regulating valve 9 is connected with the oil return pipe, and the two ends of the upper flat layer switch hydraulic valve 8 are respectively connected with the oil return port of the two-way regulating valve 9 and the oil outlet of the two-way regulating valve 9. The thick lines in fig. 1 represent oil passages including an oil supply pipe, an oil return pipe, and an oil charge pipe, and the thin lines represent electric wires; the motor 19 is a driving motor for the oil pump 21, and the two are coupled by a coupling, and is shown separately in the figure to more clearly indicate that the motor is controlled and driven.
With reference to fig. 1, 2 and 3, the working principle of the automatic accurate leveling device for the hydraulic elevator of the invention is as follows:
when the elevator car 1 does not need to stop, the upper leveling photoelectric switch 5 and the lower leveling photoelectric switch 4 output high level, and the coil of the upper leveling control relay 7, namely K1, and the coil of the lower leveling control relay 6, namely K2, are electrified, so that the normally closed contact K1 'of the upper leveling control relay 7, namely K1, and the normally closed contact K2' of the lower leveling control relay 6, namely K2, are disconnected, and the upper leveling switch hydraulic valve 15 and the lower leveling switch hydraulic valve 8 are disconnected, so that the normal operation of the elevator is not influenced.
When the elevator car 1 stops at a floor needing to be stopped, if the elevator car 1 abnormally sinks below a standard leveling position in a leveling zone, namely, the lower leveling photoelectric switch 4 downwards exceeds a corresponding leveling baffle, the lower leveling photoelectric switch 4 outputs a low level, a coil of the lower leveling control relay 6, namely K2, is deenergized, the normally closed contact K2' of the lower leveling control relay 6, namely K2, is closed, the lower leveling switch hydraulic valve 8 is switched on, hydraulic oil in the hydraulic cylinder 2 flows back to the oil tank 22, the oil pressure in the hydraulic cylinder 2 is reduced, the elevator car 1 automatically descends to the standard leveling position, and the elevator car is stopped until the lower leveling photoelectric switch 4 returns to the leveling baffle position, namely, the elevator car is finished to be leveled downwards; if the car 1 is abnormally lifted to be higher than the standard flat position in the flat zone, namely the upper flat photoelectric switch 5 upwards exceeds the corresponding flat baffle, the upper flat photoelectric switch 5 outputs low level, the coil of the upper flat control relay 7, namely K1, is deenergized, the normally closed contact K1' of the upper flat control relay 7, namely K1, is closed, the upper flat switch hydraulic valve 15 is switched on, high-pressure oil in the accumulator 11 enters the oil supply pipe to increase the oil pressure in the hydraulic cylinder 2, the car 1 automatically stops descending and ascending and ascends to the standard flat position, and the upper flat is completed until the upper flat photoelectric switch 5 stops when returning to the flat baffle position.
If the oil pressure in the accumulator 11 is insufficient (i.e. not higher than the oil pressure of the oil supply pipe), the accumulator 11 needs to be filled with oil and boosted, the normally open contact of the lower limit hydraulic pressure relay 13 is closed (normally open) because the oil pressure in the accumulator 11 is lower than the lower limit value, the normally closed contact of the upper limit hydraulic pressure relay 12 is also closed, the coil of the energy storage control relay 10, namely K3, is electrified, the first normally open contact K3' and the second normally open contact K3' of the energy storage control relay 10, namely K3, are both closed, the first normally open contact K3' is closed to form self-locking of the energy storage control circuit, the second normally open contact K3' is closed to enable the coil of the contactor KM to be electrified, the three normally open contacts KM ' of the contactor KM are closed, the motor 19 operates, and the oil pump 21 works to charge the accumulator 11 through the oil supply pipe; meanwhile, the normally closed contact K3' ' ' of the energy storage control relay 10, namely K3, is opened (closed when not filled with oil), the coil of the electromagnetic directional valve 18 is deenergized, the hydraulic control one-way valve 17 is opened, the passage of the oil supply pipe is cut off, and the oil pump 21 only fills the energy accumulator 11 with oil; since the closed charge is formed, the oil pressure in the accumulator 11 can be much higher than the oil pressure of the supply pipe. After the oil filling is completed, the normally closed contact of the upper limit hydraulic pressure relay 12 is disconnected because the oil pressure in the accumulator 11 is higher than the upper limit value, so that the energy storage control circuit is disconnected and the self-locking is released, finally, the motor 19 stops running, the oil pump 21 stops working, the oil filling process is finished, meanwhile, the coil of the electromagnetic directional valve 18 is electrified, the hydraulic control one-way valve 17 is connected, the passage of the oil supply pipe is communicated, and the oil supply pipe can normally work to realize the normal running of the lift car 1. Thus, the hydraulic elevator can ensure that the oil pressure in the energy accumulator 11 is in the interval of setting the required leveling pressure in the running process, and the normal running of the elevator is not influenced.
The above embodiments are only preferred embodiments of the present invention, and are not limiting to the technical solutions of the present invention, and any technical solution that can be implemented on the basis of the above embodiments without inventive effort should be considered as falling within the scope of protection of the patent claims of the present invention.
Claims (3)
1. The automatic accurate leveling device of the hydraulic elevator comprises a lift car, a hydraulic cylinder, an oil pump and an oil tank, wherein an oil inlet of the oil pump is connected with the oil tank, an oil outlet of the oil pump is connected with the hydraulic cylinder, a piston rod of the hydraulic cylinder is connected with the lift car, an oil supply pipe is arranged between the oil outlet of the oil pump and the hydraulic cylinder, and an oil return pipe is arranged between the hydraulic cylinder and the oil tank; the method is characterized in that: the automatic accurate leveling device of the hydraulic elevator comprises an upper leveling photoelectric switch, a lower leveling photoelectric switch, an upper leveling control relay, a lower leveling control relay, an upper leveling switch hydraulic valve, a lower leveling switch hydraulic valve and an energy accumulator, wherein high-pressure hydraulic oil is arranged in the energy accumulator, an interface of the energy accumulator is connected with a first end of the upper leveling switch hydraulic valve, a second end of the upper leveling switch hydraulic valve is communicated with the oil supply pipe, and the lower leveling switch hydraulic valve is connected in series on the oil return pipe; the upper flat photoelectric switch is arranged on the car and used for detecting whether the car is higher than a standard flat position, and the lower flat photoelectric switch is arranged on the car and used for detecting whether the car is lower than the standard flat position; the output signal of the upper flat layer photoelectric switch controls the on-off of a coil power supply of the upper flat layer control relay, the contact of the upper flat layer control relay controls the on-off of the coil power supply of the upper flat layer switch hydraulic valve, the output signal of the lower flat layer photoelectric switch controls the on-off of a coil power supply of the lower flat layer control relay, and the contact of the lower flat layer control relay controls the on-off of the coil power supply of the lower flat layer switch hydraulic valve.
2. The automatic accurate leveling device of a hydraulic elevator according to claim 1, wherein: the signal output end of the upper flat layer photoelectric switch outputs a high level when the car is not higher than a standard flat layer position and outputs a low level when the car is higher than the standard flat layer position, the signal output end of the upper flat layer photoelectric switch is connected with the first end of a coil of the upper flat layer control relay, and the first end of a normally closed contact of the upper flat layer control relay is connected with the first end of the coil of the upper flat layer switch hydraulic valve; the signal output end of the lower flat layer photoelectric switch outputs a high level when the car is not lower than a standard flat layer position and outputs a low level when the car is lower than the standard flat layer position, the signal output end of the lower flat layer photoelectric switch is connected with the first end of a coil of the lower flat layer control relay, and the first end of a normally closed contact of the lower flat layer control relay is connected with the first end of the coil of the lower flat layer switch hydraulic valve; the positive power input end of the upper flat layer photoelectric switch, the second end of the normally closed contact of the upper flat layer control relay, the positive power input end of the lower flat layer photoelectric switch, the second end of the normally closed contact of the lower flat layer control relay and the positive output end of the flat layer control direct current power supply are connected with each other, and the negative power input end of the upper flat layer photoelectric switch, the second end of the coil of the upper flat layer control relay, the second end of the coil of the upper flat layer switch hydraulic valve, the negative power input end of the lower flat layer photoelectric switch, the second end of the coil of the lower flat layer control relay, the second end of the coil of the lower flat layer switch hydraulic valve and the negative output end of the flat layer control direct current power supply are connected with each other.
3. The automatic accurate leveling device of a hydraulic elevator according to claim 2, characterized in that: the automatic accurate leveling device of the hydraulic elevator further comprises an energy storage control relay, an upper limit hydraulic pressure relay, a lower limit hydraulic pressure relay, a hydraulic control one-way valve and an electromagnetic reversing valve, wherein an oil outlet of the oil pump is communicated with an interface of the energy storage device, the upper limit hydraulic pressure relay and the lower limit hydraulic pressure relay are respectively arranged on the oil filling pipe and are respectively used for detecting whether the oil pressure in the energy storage device is higher than the upper limit pressure and lower than the lower limit pressure, a normally closed contact of the upper limit hydraulic pressure relay is closed when the pressure in the energy storage device is not higher than the upper limit pressure and is opened when the pressure in the energy storage device is higher than the upper limit pressure, a normally open contact of the lower limit hydraulic pressure relay is opened when the pressure in the energy storage device is not lower than the lower limit pressure and is closed when the pressure in the energy storage device is lower than the lower limit pressure, and the hydraulic control one-way valve controlled by the electromagnetic reversing valve is arranged on a supply pipe in series connection position between the oil filling pipe and the oil supply pipe and the hydraulic cylinder; the normally open contact of the lower limit hydraulic pressure relay is connected in parallel with the first normally open contact of the energy storage control relay and then is connected in series with the normally closed contact of the upper limit hydraulic pressure relay and the coil of the energy storage control relay to form an energy storage control circuit, the normally closed contact of the energy storage control relay is connected in series with the coil of the electromagnetic reversing valve to form an oil supply control circuit, and two ends of the energy storage control circuit and two ends of the oil supply control circuit are respectively connected with the flat layer control direct current power supply correspondingly; the second normally open contact of the energy storage control relay is connected with the coil of the contactor in series, and the normally open contact of the contactor is connected with the power input end of the motor of the oil pump in series.
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| CN201710970253.5A CN107500083B (en) | 2017-10-18 | 2017-10-18 | Automatic accurate leveling device of hydraulic elevator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101585461A (en) * | 2009-04-17 | 2009-11-25 | 康力电梯股份有限公司 | Elevator accurate level control system |
| JP2014156350A (en) * | 2013-01-16 | 2014-08-28 | Mitsubishi Electric Corp | Car position detector |
| CN205472055U (en) * | 2016-04-07 | 2016-08-17 | 苏州捷菱快速电梯有限公司 | Leveling device suitable for elevator |
| CN207293876U (en) * | 2017-10-18 | 2018-05-01 | 四川泰升液压电梯制造有限公司 | A kind of hydraulic elevator accurate leveling device automatically |
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2017
- 2017-10-18 CN CN201710970253.5A patent/CN107500083B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101585461A (en) * | 2009-04-17 | 2009-11-25 | 康力电梯股份有限公司 | Elevator accurate level control system |
| JP2014156350A (en) * | 2013-01-16 | 2014-08-28 | Mitsubishi Electric Corp | Car position detector |
| CN205472055U (en) * | 2016-04-07 | 2016-08-17 | 苏州捷菱快速电梯有限公司 | Leveling device suitable for elevator |
| CN207293876U (en) * | 2017-10-18 | 2018-05-01 | 四川泰升液压电梯制造有限公司 | A kind of hydraulic elevator accurate leveling device automatically |
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