CN113800361A

CN113800361A - Elevator driving system based on electric chassis

Info

Publication number: CN113800361A
Application number: CN202111072596.2A
Authority: CN
Inventors: 夏清和; 唐晓琳
Original assignee: Beijing Sword Electric Industrial Co ltd
Current assignee: Beijing Sword Electric Industrial Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2021-12-17

Abstract

The invention relates to the field of elevator control, and provides an elevator driving system based on an electric chassis. The system comprises: the elevator comprises an electric chassis, a lift car and a guide wheel; the electric chassis and the cage are connected by a traction rope passing around the guide pulley 3; the guide wheels are arranged at the top of the elevator shaft; the electric chassis and the elevator car are arranged in a hoistway; the electromechanical device built in the electric chassis, the guide wheel, the diverting pulley arranged on the cage and the hauling rope form an elevator dragging output system for outputting and transmitting power, and when the electromechanical device built in the electric chassis operates, the cage and the electric chassis move up and down in the hoistway. According to the elevator, the traction machine and the energy storage battery are arranged on the counterweight side of the traditional elevator, so that the elevator is separated from a power grid to operate, potential energy recovery is realized, and the functions of peak clipping and valley filling of the power grid are realized at the same time, and the elevator has the advantages of energy conservation, emission reduction, safety and reliability.

Description

Elevator driving system based on electric chassis

Technical Field

The invention relates to the technical field of elevator control, in particular to an elevator driving system based on an electric chassis.

Background

At present, the elevator becomes an indispensable transportation tool in people's daily life. The types of elevators are various, but the composition structure and the operation principle of the elevators are similar, as shown in fig. 1, fig. 1 is a drawing principle structure diagram of the elevator. In the elevator traction principle shown in fig. 1, the elevator comprises a traction machine, a guide wheel, a car and a counterweight, the car and the counterweight are connected by using a steel wire rope passing through the traction machine rotating wheel and the guide wheel, and the operation of the elevator car is controlled by driving the steel wire rope to operate under the driving of the traction machine.

The existing elevator basically adopts a traction structure, and in order to reduce the power of a motor, a counterweight device is additionally arranged on the side of a car; the weight of the counterweight is heavier than that of the car, when the elevator runs, if the weight of the car side is lower than that of the counterweight side during ascending or the weight of the car side is higher than that of the counterweight side during descending, the motor runs in a power generation mode, and the generated regenerated energy is generally consumed in a heat energy mode by a brake resistor, so that the elevator is wasted; therefore, the elevator is in an energy consumption state no matter which direction the elevator runs, and the energy consumption is large; the elevator peak operation time is generally in daytime, is in the power consumption peak period this moment, and the electrovalence is high, can not effectively utilize the crest power consumption, reduces the power consumption expense. Meanwhile, a control box for controlling the operation of the elevator needs to be arranged independently, and the space is occupied.

Therefore, a new elevator system with an elevator traction structure is needed to realize the safe, energy-saving and effective operation of the elevator function.

Disclosure of Invention

In order to solve the problems in the prior art, namely, the problem that the elevator consumes huge energy in the operation process of the existing elevator is solved, the elevator needs to drag a heavy object to move vertically, much energy is converted into potential energy of the heavy object, the energy consumption is large, and recoverable energy is wasted when the elevator operates up and down; most elevators operate in the daytime, and the operation period of the elevators does not have a power utilization peak period, so that the electricity price is high, and the power utilization of wave troughs cannot be well utilized; the control box for controlling the operation of the elevator needs to be separately arranged, and occupies space. The invention adopts the following technical scheme to solve the problems:

the application provides an elevator driving system based on electronic chassis, this elevator driving system based on electronic chassis includes: the elevator comprises an electric chassis, a lift car and a guide wheel; the electric chassis and the elevator car are connected through a hauling rope which bypasses the guide wheel; the guide wheels are arranged at the top of the elevator shaft; the electric chassis and the elevator car are arranged in a hoistway and are respectively arranged on two sides of the hoistway; the electric chassis forms an elevator traction output system through built-in electromechanical equipment, the guide wheel, the diversion sheave arranged on the elevator car and the traction rope, outputs and transmits power, and when the built-in electromechanical equipment of the electric chassis operates, the elevator car and the electric chassis move up and down in the hoistway.

In some examples, the electric chassis based elevator drive system further comprises a compensating composite cable connecting the car and the electric chassis; a power line is provided in the compensating composite cable, and the electric chassis supplies power to the car through the power line; the compensation composite cable is internally provided with a signal wire, and the car and the electric chassis perform data interaction through the signal wire; the compensation composite cable is provided with a flexible cable inside, and the flexible cable is used for balancing weight change caused by length change of the hauling rope on two sides of the guide wheel.

In some examples, the electric chassis includes a load-bearing frame, and a motor drive unit, an elevator control unit, a battery and battery management unit, a counterweight unit, and a protection unit disposed within the load-bearing frame; the motor driving unit is respectively connected with the elevator control unit and the battery and battery management unit, the battery and battery management unit provides power for the motor driving unit, the elevator control unit and the elevator electrical equipment, and the elevator control unit is used for controlling the operation of the motor driving unit.

In some examples, the motor driving unit includes a motor, a driver, an encoder, and a housing, and the motor, the encoder, the driver, and the housing are integrally and hermetically designed in an integrated housing.

In some examples, the motor driving unit is a split device, and includes a split motor and a driver.

In some examples, the driver includes a power input terminal and a power output terminal, one end of the power input terminal is connected to the dc bus of the driver, and the other end of the power input terminal is connected to the battery and the battery management unit; the power output end is connected with a power wiring end of the motor.

In some examples, the operation mode of the driver is an electric state and a power generation state, and when the driver operates in the electric state, the battery and battery management unit supplies power to the motor in the motor driving unit through the driver; when the driver works in a power generation state, the motor in the motor driving unit converts mechanical potential energy into electric energy, and the electric energy is fed back to the battery and the battery management unit through the driver to charge the battery.

In some examples, the elevator driving system based on the electric chassis comprises a charging potential, the battery and battery management unit comprises a power management module, the power management module sends a charging request to the elevator control unit when the time period and the battery capacity meet the charging condition, and when the elevator runs to the charging potential, a charging device for indicating the charging potential is connected with the battery and battery management unit to charge the battery and battery management unit; when the electric energy capacities of the battery and the battery management unit meet the conditions that the elevator runs in the whole day and the capacity is rich, the electric energy is fed back to the power grid or power is supplied to the electric equipment outside the elevator.

In some examples, the charging potential is provided at a top floor of the elevator hoistway and at a bottom floor of the elevator hoistway.

In some examples, the electric chassis based elevator drive system includes a maintenance box communicatively coupled to an elevator safety system by a safety bus, the elevator safety system comprised of an elevator control function safety plate, a hoistway function safety plate, and a ceiling safety plate; each safety board respectively collects the safety switch state of each corresponding position of the elevator, the elevator controls the safety board to judge whether the elevator is in an unsafe state, and an elevator stop command is output when the elevator is in the unsafe state, so that the safety of the elevator is ensured.

In some examples, the maintenance box is used for controlling the power supply and observing the running state of the elevator when the system is overhauled.

In some examples, the electric chassis-based elevator driving system further includes a braking safety gear and an absolute position measuring instrument, the braking safety gear being independently disposed at an outer side of the car and an outer side of the load-bearing frame, respectively; the absolute position measuring instrument measures the absolute position, real-time speed and real-time acceleration of the elevator car and the electric chassis in the well in real time, and triggers the braking safety tongs to brake the elevator car and the electric chassis when the electric chassis is overspeed.

In some examples, the protection unit is disposed at a lower side of the electric chassis and is used for reducing impact and protecting safety of the electric chassis when the electric chassis is accidentally squat.

In some examples, the counterweight unit includes counterweight blocks and a counterweight frame, and the counterweight unit is assembled by inserting a plurality of modular counterweight blocks into the counterweight frame.

The elevator driving system based on the electric chassis uses the electric chassis to replace a counterweight, and the position of a machine room does not need to be specially set; meanwhile, the motor, the battery and the battery management unit are arranged on the counterweight side, so that the number of counterweight blocks can be reduced; the motor and the electric device for driving are integrated in the electric chassis, so that the electric chassis is convenient to manufacture and maintain; the arrangement of the battery and the battery management unit enables the elevator to be separated from a power grid for use, and the elevator automatically returns to a charging position for charging when the battery is dead. Meanwhile, the arrangement of the battery and the battery management unit enables the elevator to be charged when the power utilization trough is formed, and the energy storage and the power supply of the battery and the battery management unit are utilized when the power utilization wave crest is formed, so that the power utilization cost is reduced, and the energy conservation and the efficiency improvement are achieved.

Drawings

Fig. 1 is a schematic diagram of an elevator traction structure in the background art of the application;

fig. 2 is a schematic structural diagram of another embodiment of an elevator function safety control system in the embodiment of the application;

fig. 3 is a schematic diagram of the traction structure of the elevator in the specific embodiment of the application;

FIG. 4 is a view showing a constitution of an electric chassis in the embodiment of the present application;

FIG. 5 is a schematic structural diagram of a motor driving unit in the embodiment of the present application;

fig. 6 is a schematic diagram of an elevator traction structure with a cable connection between a power chassis and a charging station in the embodiment of the application;

fig. 7 is a schematic structural diagram of a security system in an embodiment of the present application.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 2 shows a schematic diagram of an exemplary elevator traction structure to which embodiments of the present application can be applied.

As shown in fig. 2, the electric chassis-based elevator driving system includes: electric chassis 1, car 2 and leading wheel 3. The electric chassis 1 and the car 2 are connected by a hoisting rope passing around the guide sheave 3. The guide sheave 3 is installed at the top of an elevator shaft, and the electric chassis 1 and the car 2 are installed in the shaft, are disposed at both sides of the shaft, and can be moved up and down in the elevator shaft under the traction of a traction rope. The electromechanical device built in the electric chassis 1, the guide pulley 3, the diverting pulley provided in the car, and the hoisting rope constitute an elevator traction output system for outputting and transmitting power, and when the electromechanical device built in the electric chassis 1 operates, the car 2 and the electric chassis 1 are moved up and down in the hoistway. The electromechanical device built in the electric chassis 1 is a device for outputting or transmitting power, such as a motor.

In this embodiment, the electric chassis 1 outputs and transmits power to pull the movement of the hoisting rope, and drives the car 2 to move up and down. As can be seen from fig. 2, the electric chassis 1 has a function of balancing a car, i.e., a function of balancing a weight in a conventional elevator structure, and also has a function of a traction machine, outputs power, and pulls a traction rope to realize the operation of an elevator. In this embodiment, the hoisting rope may be a steel wire rope or a covering belt.

With continued reference to fig. 3, fig. 3 shows a schematic diagram of an elevator traction structure of a specific embodiment of the present application.

As shown in fig. 3, the electric chassis-based elevator driving system includes an electric chassis 1, a car 2, and a guide wheel 3, a compensating composite cable 4, a charging station 5, and a maintenance box 6. The electric chassis 1 and the car 2 are connected by a hoisting rope passing around the guide sheave 3. The guide sheave 3 is installed at the top of the hoistway, and two fixing devices for fixing the hoist rope are installed at appropriate positions on both sides of the same horizontal line of the guide sheave 3, and both ends of the hoist rope are connected to the fixing devices.

As can be seen from fig. 3, the car 2 and the electric chassis 1 are connected by a hoisting rope, and move up and down in the hoistway under the traction of the hoisting rope; it can be understood that, when the car 2 moves upward, the electric chassis 1 moves downward; when the car 2 moves down, the electric chassis 1 moves up. The electric chassis 1 is one end for providing power, and the car 2 at the other end of the hauling rope is driven by the electric chassis 1 to move up and down. The compensation composite cable 4 is connected between the electric chassis 1 and the car 2 to control the dynamic balance of the electric chassis 1 and the car 2. The charging potential 5 can charge the electric chassis 1, and the maintenance box 6 can be used for routine maintenance and inspection of the electric chassis 1 and the car 2.

The compensating composite cable 4 has a built-in power line through which the electric chassis 1 supplies power to the car 2; a signal line built in the compensation composite cable 4, through which data interaction between the car 2 and the electric chassis 1 is performed; and a flexible cord built in the compensating composite cable 4 for balancing a weight change caused by a length change of the hoist rope on both sides of the guide sheave 3. In the operation of the elevator, the weight of the two sides of the guide wheel is changed due to the position change of the elevator car and the electric chassis 1, the balance is damaged, and the dynamic balance is required to be carried out through the compensation composite cable.

Referring to fig. 4, fig. 4 is a structural diagram of the electric chassis in this embodiment, and as shown in fig. 4, the electric chassis 1 includes a supporting frame 10, and a motor driving unit 11, an elevator control unit 12, a battery and battery management unit 13, a counterweight unit 14, and a protection unit 15 disposed in the supporting frame 10. The units may be arranged in order from top to bottom.

In some specific implementations of the present embodiment, the motor driving unit 11 may be an integrated design of a motor and a driver. Specifically, a motor for traction and a driver for supplying power to the motor are integrally provided. The motor can be a synchronous motor, an asynchronous motor and other traction equipment; the driver may be a driving device such as a frequency converter or an inverter. In another embodiment of this embodiment, the actuator may be provided separately from the elevator control unit 12.

The elevator control unit 12 outputs information for controlling the operation of the elevator through an operation of an internal preset program or circuit according to the acquired information related to the operation of the elevator and external instruction or command information. The information related to the operation of the elevator includes: the information of the electric safety switches distributed at various positions such as a machine room, a well, a car roof and the like, the door zone information and the leveling information of the elevator, the door motor information of the elevator and the like. The information for controlling the operation of the elevator can be information for indicating or commanding the up/down of the elevator, or information for indicating the leveling of the elevator, etc.

The battery and battery management unit 13 supplies power to the motor drive unit 11 and the elevator control unit 12, and may also supply power to elevator electrical equipment; meanwhile, the battery and the battery management unit 13 can also store energy and can reversely supply the stored electric energy to the power grid. The battery management unit 13 includes a battery for storing electric energy, and supplies power to the electric device through the battery.

The counterweight unit 14 is used for balancing the weight of the elevator car connected with the counterweight unit through a hoisting rope, and in operation, the output power of the motor only needs to drive the weight difference between the counterweight and the car, so that the car can move up and down. Specifically, the counterweight unit 14 includes counterweight blocks and a counterweight frame. The counterweight blocks are provided with a flat weight, and the counterweight blocks are fixed and loaded by the counterweight frame. The counterweight unit 14 is provided to be removable, and the number of counterweight blocks is increased or decreased as required. In order to facilitate the adjustment of the counterweight unit at any time, the counterweight blocks can be arranged into modular counterweight blocks, and the counterweight unit 14 is formed by assembling a plurality of modular counterweight blocks inserted into the counterweight frame. For example, the modular counter-weight may be bladed to facilitate extraction as required.

The protection unit 15 is arranged on the lower side of the electric chassis and used for preventing the elevator from being out of control or brake failure and playing a role in buffering and protecting when the elevator rushes to the top or squats to the bottom. The protection unit 15 can adopt a protection buffer with a long-life rigid buffer structure, so that impact is reduced when the user squats at the bottom, the battery is not damaged by explosion, and a motor and a control system are protected from being damaged.

In a specific mode of this embodiment, referring to fig. 6, fig. 6 is a schematic diagram of a composition structure of the motor driving unit, and as shown in fig. 6, the motor driving unit 11 includes a motor 111 and a driver 112, and a housing 113 enclosing the motor 111 and the driver 112 as an integrated device.

The housing 113 is integrally formed and is divided into a first housing 1131 and a second housing 1132 by a partition within the housing cavity. The main body of the motor 111, such as the rotor, stator, coil, and shaft of the motor, is assembled in the first housing 1131; the above-described driver is fitted in the second housing 1132; the first casing 1131 and the second casing 1132 are separated by an intermediate partition. The power output end of the driver 112 is connected to the power terminal of the motor 111 through a cable or other electrical connection member, so that the power output of the driver 112 supplies power to the motor 111 to drive the motor 111 to operate. The intermediate partition board is provided with a through hole, and the cable or the electric connecting piece can be connected through the through hole. Wherein, the encoder can be arranged on the driver 112, and the end of the rotating shaft of the motor corresponds to the encoder. The encoder directly measures the rotational speed of the motor and transmits the measurement result to the driver 112, reducing the transmission path of the signal. The casing of the housing 113 may be made of a heat dissipating material, or a heat sink may be added to the casing of the housing 113 to satisfy the heat dissipating requirement of the motor driving unit.

In this embodiment, the driver 112 may be a power device having power conversion, such as an inverter for converting dc power into ac power, and converts the input dc power into ac power under the driving control of the control signal. The control signal may be the number of pulses or the frequency of the pulses to control the conduction angle of the power device, so as to control the voltage, current, frequency, etc. of the output power of the inverter, thereby accurately positioning the motor position or controlling the rotation speed, acceleration, etc. of the motor. The driver 112 further includes a power port and a communication port, wherein the power port is an output power port and an input power port. An output power supply port is connected with a power supply terminal of the motor 111 through an electric connecting piece and outputs three inverted alternating current power supplies to the output power supply port; the battery and battery management unit 113 is connected to the input power port, and the battery and battery management unit 113 supplies dc power to the input power port. In practical application, the input power supply port can be directly connected with the direct current bus of the inverter through a copper bar. The communication port is connected to the elevator control unit 12. Through the communication port, the elevator control unit 12 performs information exchange with the drive 112. The elevator control unit 12 sends a command or instruction information to the driver 112 so that the inverter operates according to the instruction information, and receives operation information, such as a rotational speed, voltage information, current information, temperature information, etc., about the driver 112 and the motor 111, which is sent from the driver 112.

In this embodiment, the power output terminal of the battery and battery management unit 13 is connected to the driver in the motor driving unit 11. In a specific implementation manner of this embodiment, the driver may be an inverter, a frequency converter, or another controllable power device, and the power output terminal of the battery and battery management unit 13 is directly connected to the dc bus of the controllable power device. The power output terminal of the driver 112 in the motor driving unit 11 is connected to the power supply terminal of the motor. Specifically, the driver 112 is an inverter, and an ac output terminal of the inverter is directly connected to a power supply terminal of the motor. The operation modes of the driver 112 are a motoring state and a generating state. When the driver 112 is operated in an electric state, the battery and battery management unit 13 supplies power to the motor in the motor driving unit 11 through the driver 112, and the motor outputs power to the outside to drive the car to reach a specified position under the traction operation of the hoisting rope. When the operation mode of the driver 112 is the power generation state, the motor 111 in the motor driving unit 11 is in the power generation state, converts the mechanical potential energy of the elevator car 2 and the electric chassis 1 into electric energy, and feeds back the electric energy to the battery and battery management unit 13 through the driver 112. For example, when the car 2 is moving upward with no load or moving downward with a heavy load, the opposite electric chassis 1 needs to be braked, and the motor 111 is in a power generation state, and the electric power generated by the motor 111 is fed back to the battery and the battery management unit 13 through the driver 112.

Since the driver 112 and the motor are integrally designed, the connection between the driver 112 and the motor can be directly and integrally integrated inside the motor driving unit 11.

The battery and battery management unit 13 is connected to the elevator control unit 12. Specifically, the power output end of the battery and battery management unit 13 is connected to the elevator control unit 12 to supply power to the elevator control unit 13; meanwhile, the battery and battery management unit 13 further includes a power management module for performing safety monitoring and effective management on the battery, and the power management module is connected to the elevator control unit 12. The power management module sends battery status information of the battery in the unit, including information such as battery level information, voltage information, current information, temperature information, and battery insulation resistance, to the elevator control unit 13. The voltage information can be the voltage information of the single battery, the voltage information of the battery pack, whether the battery pack is in overvoltage, undervoltage and the like; the current information can be loop current information, whether overcurrent exists and the like; the temperature information may be information such as the temperature of the battery post, the overheating of the battery, and the like. The elevator control unit 12 transmits instruction information to the battery management module, and the instruction information may be information instructing the battery and battery management unit 13 to cut off power supply, information instructing the battery and battery management unit 13 to return to a charging station for charging, or the like.

According to the preset logic, the power management module automatically returns to the charging position 5 and indicates a charging device of the charging position 5 to be connected with the battery and battery management unit 13 to realize charging/discharging under the condition that the time information and the received electric quantity information about the battery and the battery management unit 13 meet the charging/discharging conditions. In a specific implementation manner of this embodiment, the power management module sends a charging request to the elevator control unit 12 under the condition that the time period and the battery capacity satisfy the charging, and when the elevator runs to the charging location 5, a charging device indicating the charging location 5 is connected to the battery and battery management unit 13 to charge the battery and battery management unit 13; when the capacity of the battery power is sufficient for the elevator to run all day long and the capacity is abundant, the battery power is discharged to the outside, that is, the battery power can be reversely supplied to the external electric equipment of the elevator or input into the power grid through the battery management unit 13 for use. When the condition of discharging to the outside is met, a discharging request is sent to the elevator control unit 13, and after the elevator runs to the charging position 5, a charging device for indicating the charging position is connected with the battery and the battery management unit 13 to feed back electric energy to the power grid.

In another implementation manner of this embodiment, referring to fig. 5, fig. 5 is a schematic diagram of an elevator traction structure with a cable connection between an electric chassis and a charging location in this embodiment of the application. As shown in fig. 5, the charging station 5 and the electric chassis 1 are connected by a cable, and the battery management unit are charged or discharged to the outside by the cable connected to the charging station 5 and the electric chassis 4, so that the electric chassis 1 can be charged or discharged without returning to the charging station 5. The external discharge can be discharge to the external electrical equipment of the elevator or electric energy feedback to the power grid.

The charging conditions of the battery and the battery management unit 13 may be: it is detected that the amount of power of the battery and the battery management unit 13 is lower than a first threshold, or the amount of power of the battery and the battery management unit 13 is lower than a second threshold in a set charging period. The above-mentioned set charging time period can be determined according to the power usage of the power supply network, and the above-mentioned set charging time period can be set to be charged during the power utilization trough at night in the power utilization trough period. The first threshold is smaller than the second threshold, and for example, the first threshold may be set to 5% and the second threshold may be set to 90%. Obviously, when the electric quantity of the battery management unit 13 is lower than the first threshold value, the electric energy must be supplemented, otherwise, the operation or the safety of the elevator is influenced; when the power of the battery management unit 13 is higher than the second threshold, at this time, power replenishment is not required.

In specific application, according to the use condition of the elevator, a battery with appropriate electric energy capacity is selected to meet the use requirement of one charging cycle of the elevator, and when the electric quantity of the battery and the battery management unit 13 is detected to be low, such as being lower than a first threshold value, the battery and the battery management unit need to be charged regardless of whether the battery and the battery management unit are in a preset charging time period. If the power of the battery and the battery management unit 13 is higher than the first threshold, the battery is charged in a preset charging time period. In the set charging time period, when the electric quantity of the battery is detected to be lower than the second threshold value, the elevator control unit 12 controls the elevator to return to the charging position 5 and instructs the charging position 5 to charge the battery and the battery management unit 13. In a preset charging period, when the electric quantity of the battery and the battery management unit 13 is detected to be larger than the second threshold value, the battery and the battery management unit do not need to be charged, and the elevator can be used as a running elevator in the period.

In this embodiment, two charging stations 5 are provided, which can be respectively arranged at the bottom and the top of the hoistway. When the elevator car 2 arrives at the top floor, the electric chassis 1 at the opposite side moves to the bottom of the shaft at the moment, and the charging potential 5 arranged at the bottom can charge the battery and the battery management unit 13; similarly, when the car 2 of the elevator reaches the lowest floor, the electric chassis 1 on the opposite side moves to the top of the hoistway at this time, and the charging potential 5 provided at the top of the hoistway can charge the battery and the battery management unit 13.

In other implementations of the present embodiment, the counterweight unit 14 may be reduced or not used, and the number of the batteries and the battery management unit 13 may be increased. In this case, the battery and the battery management unit 13 may also be used as an energy storage device. For example, energy feedback may be provided to the grid during grid supply peaks, or power may be provided to other electrical devices within the cell, such as to an electric vehicle charging station.

The condition for the external discharge by the battery and battery management unit 13 may be that the capacity of the stored electric energy is sufficient for the entire day of operation of the elevator and the capacity is abundant. Specifically, the following may be mentioned: the amount of electricity of the battery and the battery management unit 13 is greater than the third threshold value during a specified discharge period. When the battery and battery management unit 13 supplies power to other electric devices on the power grid or feeds back electric energy to the power grid, the power consumption of the elevator system needs to be ensured in a set power consumption time period, such as a power consumption peak time period in the daytime.

The battery and battery management unit 13 is also connected to the car 2. The power output terminal of the battery and battery management unit 13 is connected to the car 2 via a compensating composite cable, and supplies power to the electric devices of the car 2. Specifically, the battery and battery management unit 13 supplies power to the car roof, the door controller, the door operator, and other devices in the car, such as lighting and an exhaust fan, through a built-in power line. Meanwhile, control devices in the car 2, such as the car roof, the door machine controller, the door machine, and the like, are connected to the control unit 12 through signal lines built in the compensation composite cable, and perform data interaction through the compensation composite cable. Namely, the compensation composite cable can not only supply power, but also carry out data interaction.

The car 2 and the elevator control unit 12 are communicated by a safety bus, the car roof plate acquires signals of car roof electrical safety switches (such as car roof emergency stop, safety tongs, car door lock and the like) through a car roof sensor connected with the car roof plate, and determines whether the car roof is safe or not based on the acquired signals, so that safety information is sent to a safety loop. The safety bus is a field bus adopting safety measures in a communication protocol. The adopted safety measures mainly comprise: echo mode, CRC redundancy check, connection test, address detection, time detection, etc.

In this embodiment, the elevator driving system based on the electric chassis further includes a maintenance box 6, the maintenance box is in communication connection with the elevator safety system in a safety bus mode, and safety detection and conventional maintenance are performed through the maintenance box 6. The elevator safety system consists of a control safety plate, a hoistway safety plate and a car top safety plate. Each safety board is in communication connection in a safety bus mode, and each safety board respectively acquires the safety switch state of each position corresponding to the elevator; the control safety board judges whether the elevator is in an unsafe state or not through the received safety information of the hoistway safety board and the car top safety board, and outputs an elevator stop command when the elevator is in the unsafe state, so that the safety of the elevator is ensured. Specifically, referring to fig. 7, fig. 7 is a schematic diagram of a composition structure of the safety system, and as shown in fig. 7, the control safety board is connected to the drive control side safety switch, and receives information of each safety switch to perform safety judgment. The driving control side safety switch comprises a turning hand wheel emergency stop switch, a control cabinet emergency stop switch, a speed limiter switch and the like. The well safety board is connected with the well safety switches, receives information of each safety switch and judges safety. The well safety switch comprises a pit emergency stop switch, a maintenance operation switch, a maintenance downlink switch, a maintenance uplink switch, a maintenance switch, a car buffer switch, an electric chassis protection switch and a tensioning wheel switch. The car top safety plate is connected with the car top safety switches, receives information of each safety switch and judges safety. The car top safety switches are limit switches, car door lock switches, leveling switches and door zone switches. The control safety plate, the hoistway safety plate and the car roof safety plate are communicated through a safety bus. The control safety board carries out safety decision judgment, receives safety information of the car top safety board and the shaft safety board through the safety bus, carries out decision judgment according to the received safety information, judges whether the elevator is in a non-safety state or not, and outputs an elevator stop command when the elevator is in the non-safety state so as to ensure the safety of the elevator.

The maintenance box 6 can be arranged outside the elevator shaft and can be arranged outside the bottom layer shaft of the floor and the top layer elevator shaft of the floor. The shaft safety plate can be arranged in a maintenance box at the bottom of a floor, and the safety switch of the elevator shaft and the safety on-off equipment of a pit are overhauled and maintained through the maintenance box. The car top safety plate can be arranged in a maintenance box positioned at the top layer of a floor, and the safety switch and the safety equipment of the elevator car top are overhauled and maintained through the maintenance box.

In this embodiment, the elevator driving system based on the electric chassis 1 further includes a braking safety gear and an absolute position measuring instrument. The braking safety tongs are independently installed at the outer side of the car 2 and the outer side of the carrying frame 10, and the absolute position measuring instruments may be installed in the elevator shaft, on the car, and on the electric chassis. Specifically, the absolute position measuring instruments are respectively arranged on the top of the electric chassis running guide rail and the top of the car running guide rail. The absolute position measuring instrument measures the speed of the object to be measured based on the absolute position difference between the object to be measured (car, electric chassis) and the absolute position measuring instrument.

The absolute position measuring instrument measures and records the absolute position of a measured target (a car and an electric chassis) in a hoistway in real time, and the elevator cannot slip due to a steel wire rope in the running process or lose the position after power failure, so that the floor staggering condition is avoided. When the absolute position measuring instrument detects that the elevator exceeds the running distance range, the running stop command is transmitted through the safety bus, and the control system immediately triggers the brake and the safety tongs to make the elevator.

And when the braking safety tongs detect that the speed of the car 2 or the electric chassis 1 exceeds a set value, triggering the braking safety tongs to brake the car or the electric chassis. The car 2 and the electric chassis 1 run on respective tracks, and the braking safety tongs are arranged on the tracks of the car 2 and used for clasping the braking safety tongs with the tracks of the car 2 when the car 2 stalls (such as a broken hauling rope), so that the safety of passengers in the car 2 is ensured by braking the car 2; similarly, the braking safety tongs are arranged on the track of the electric chassis 1, and when the electric chassis 1 stalls (for example, a traction rope is broken), the braking safety tongs are tightly held with the track of the electric chassis 1 to brake the electric chassis 1, so as to prevent the electric chassis 1 from being damaged, and prevent the battery and the battery management unit from being collided by external force to cause accidents.

Compared with the prior art, the embodiment of the application has the following beneficial effects:

the motor and the elevator control system of the elevator are transferred to the counterweight side, and the position of a machine room does not need to be specially set; meanwhile, the motor, the battery and the battery management unit are arranged on the counterweight side, so that the number of counterweight blocks can be reduced;

compared with the motor arranged at the top of the well, the motor is arranged at the counterweight side, only smaller traction driving force is needed, the electric energy can be saved, and the weight of the motor is reduced;

the motor and the electric power device for driving are integrated into a whole, so that the installation, maintenance and management are facilitated;

the electric chassis supplies power to the lift car through the compensation composite cable, and simultaneously performs data interaction with the lift car through the compensation composite cable in a safe bus mode, so that the number of cables and the complexity of lines are reduced;

the arrangement of the battery and the battery management unit enables the elevator to be separated from a power grid for use, and the elevator automatically returns to a charging position for charging when the battery is dead. Meanwhile, the battery and the battery management unit can be charged when the power utilization trough is formed, and the energy storage and power supply of the battery and the battery management unit are utilized when the power utilization wave crest is formed, so that the peak clipping and trough filling are realized, the power utilization cost is reduced, and the energy saving and the efficiency improvement are achieved.

The distributed energy storage in a local area is realized by expanding the capacity of the battery, the energy stored by the battery and the battery management unit is externally supplied to realize energy feedback to the power grid when the power consumption of the power grid reaches a peak, and particularly, the peak clipping and valley filling of the power grid are realized without power capacity increase when an old cell is transformed.

The weight of the counterweight can be adjusted by increasing or decreasing the counterweight blocks, so that the balance between the car and the counterweight side is met.

The protection unit protects the safety of the battery and the battery management unit, the motor driving unit and the elevator control unit when the electric chassis squats.

The safety system with the control function and the safety gear with the double functions of the application and the protection of the car and the counterweight electronic safety gear are used for ensuring the safety of the elevator.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. An electric chassis based elevator drive system, comprising: the elevator comprises an electric chassis, a lift car and a guide wheel; the electric chassis is connected with the elevator car through a traction rope which bypasses the guide wheel;

the guide wheels are arranged at the top of the elevator shaft; the electric chassis and the lift car are arranged in a hoistway and are respectively arranged on two sides of the hoistway;

the elevator traction output system is composed of electromechanical equipment arranged in the electric chassis, the guide wheel, the diversion sheave arranged on the lift car and the traction rope, power is output and transmitted, and when the electromechanical equipment arranged in the electric chassis operates, the lift car and the electric chassis move up and down in the shaft.

2. The electric chassis based elevator drive system of claim 1, further comprising a compensating compound cable connecting the car and the electric chassis;

a power line is arranged in the compensation composite cable, and the electric chassis supplies power to the car through the power line;

a signal wire is arranged in the compensation composite cable, and the car and the electric chassis perform data interaction through the signal wire;

the compensation composite cable is internally provided with a flexible cable, and the flexible cable is used for balancing the weight change caused by the length change of the traction rope on the two sides of the guide wheel.

3. The electric chassis-based elevator drive system of claim 1, wherein the electric chassis comprises a load-bearing frame and a motor drive unit, an elevator control unit, a battery and battery management unit, a counterweight unit, and a protection unit disposed within the load-bearing frame;

the motor driving unit is respectively connected with the elevator control unit and the battery and battery management unit, the battery and battery management unit provides power for the motor driving unit, the elevator control unit and the elevator electrical equipment, and the elevator control unit is used for controlling the operation of the motor driving unit.

4. The electric chassis based elevator drive system of claim 3, wherein the motor drive unit is integrally provided, comprising a motor, a drive, an encoder, and a housing, the motor, the encoder, and the drive being hermetically provided in the integral housing.

5. The electric chassis based elevator drive system of claim 3, wherein the motor drive unit is in a split arrangement comprising a split motor and drive.

6. The electric chassis based elevator drive system of claim 5, wherein the drive includes a power input and a power output, one end of the power input is connected to the DC bus of the drive, the other end of the power input is connected to the battery and battery management unit; the power output end is connected with a power wiring end of the motor.

7. The electric chassis-based elevator drive system of claim 6, wherein the operating mode of the drive is a motoring state and a generating state, the battery and battery management unit providing power to a motor in the motor drive unit through the drive when the drive is operating in the motoring state; when the driver works in a power generation state, the motor in the motor driving unit converts mechanical potential energy into electric energy, and the electric energy is fed back to the battery and the battery management unit through the driver to charge the battery.

8. The elevator driving system based on the electric chassis as claimed in claim 7, wherein the elevator driving system based on the electric chassis comprises a charging potential, the battery and battery management unit comprises a power management module, the power management module sends a charging request to the elevator control unit under the condition that the time period and the battery capacity meet the charging condition, and after the elevator runs to the charging potential, a charging device indicating the charging potential is connected with the battery and battery management unit to charge the battery and battery management unit;

and when the electric energy capacities of the battery and the battery management unit meet the conditions that the elevator runs in the whole day and the capacity is rich, feeding electric energy back to the power grid or supplying power to the electric equipment outside the elevator.

9. The electric chassis based elevator drive system of claim 8, wherein the charge potential is disposed at a top floor of the elevator hoistway and a bottom floor of the elevator hoistway, respectively.

10. The electric chassis based elevator drive system of claim 1, comprising a maintenance box communicatively coupled to an elevator safety system comprised of an elevator control function safety plate, a hoistway function safety plate, and a ceiling safety plate by way of a safety bus; each safety board respectively collects the safety switch state of each corresponding position of the elevator, the elevator controls the safety board to judge whether the elevator is in an unsafe state, and an elevator stop command is output when the elevator is in the unsafe state, so that the safety of the elevator is ensured.

11. The electric chassis based elevator drive system of claim 10, wherein the maintenance box is used to control power supply and observe elevator running status during system maintenance.

12. The electric chassis based elevator drive system of claim 3, further comprising a braking safety gear and an absolute position gauge, the braking safety gear being independently disposed outside the car and outside the load frame, respectively; the absolute position measuring instrument measures the absolute position, the real-time speed and the real-time acceleration of the elevator car and the electric chassis in the well in real time, and the electric chassis triggers the braking safety tongs when overspeed occurs to brake the car and the electric chassis.

13. The elevator driving system based on the electric chassis as claimed in claim 3, wherein the protection unit is disposed at the lower side of the electric chassis for reducing impact and protecting the safety of the electric chassis when the electric chassis is accidentally squat.

14. The motorized chassis based elevator drive system of claim 3, wherein the counterweight unit comprises a counterweight and a counterweight frame, the counterweight unit assembled by inserting a plurality of modular counterweight blocks into the counterweight frame.