CN116986507A - Hydraulic braking device for elevator traction machine - Google Patents

Hydraulic braking device for elevator traction machine Download PDF

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Publication number
CN116986507A
CN116986507A CN202210936977.9A CN202210936977A CN116986507A CN 116986507 A CN116986507 A CN 116986507A CN 202210936977 A CN202210936977 A CN 202210936977A CN 116986507 A CN116986507 A CN 116986507A
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CN
China
Prior art keywords
hydraulic
path
circuit
oil
elevator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
CN202210936977.9A
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Chinese (zh)
Inventor
品川知洋
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication of CN116986507A publication Critical patent/CN116986507A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
    • B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/26—Operating devices pneumatic or hydraulic
    • B66D5/28—Operating devices pneumatic or hydraulic specially adapted for winding gear, e.g. in mining hoists
    • 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
    • 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
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
  • Braking Arrangements (AREA)

Abstract

The hydraulic brake device for an elevator traction machine can more easily eliminate the accumulation of gas. The brake caliper (13) releases the brake disc (11) by pressurizing the hydraulic oil, and brakes by depressurizing the hydraulic oil. The 1 st electromagnetic valve (16) is provided in an open/close circuit including a pressurizing path and a depressurizing path. The pressurization path is a path from the oil tank (14) to the brake caliper (13) via the pump (15). The pressure-removing path is a path from the brake caliper (13) to the oil tank (14). A1 st solenoid valve (16) selectively switches between a pressurizing path and a pressurizing path. A2 nd solenoid valve (17) selectively switches between the exhaust circuit and the open/close circuit. The exhaust circuit is a circuit that reaches the oil tank (14) from the oil tank (14) through the pump (15) and the brake caliper (13) in a state of braking the brake disc (11) so as to pass through the pressurizing path and the depressurizing path.

Description

Hydraulic braking device for elevator traction machine
Technical Field
The present invention relates to a hydraulic brake device for an elevator hoisting machine.
Background
Patent document 1 discloses an example of a hydraulic brake device for an elevator hoisting machine. In the hydraulic brake device, an accumulator and a pump are provided in a hydraulic unit that supplies hydraulic pressure. The accumulator stores oil in a state where a pressure in a predetermined range is applied. The pump is started when the hydraulic pressure in the accumulator is lower than the lower limit of the prescribed range, and supplies the hydraulic oil so that the hydraulic pressure in the accumulator is within the prescribed range. In the hydraulic brake device, the number of times of pump activation and the number of times of opening and closing of the hydraulic brake device are counted. In the hydraulic brake device, when the number of pump starts exceeds a predetermined value with respect to the number of times of opening and closing the hydraulic brake device, an abnormality of liquid pressure drop is detected.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2013-193803
Disclosure of Invention
In the hydraulic brake device, gas may be accumulated in a flow path or the like through which the hydraulic oil flows due to gas permeation or the like in the accumulator. As a result, the operation of the hydraulic brake device may be slow. In the hydraulic brake device of patent document 1, accumulation of gas cannot be detected. Therefore, a regular exhaust operation and the like are required, and time is required for maintenance spot inspection and the like.
The present invention has been made to solve such problems. The invention provides a hydraulic brake device for an elevator traction machine, which can eliminate accumulation of gas more easily.
The hydraulic brake device for an elevator hoisting machine of the present invention comprises: a tank for storing working oil; a pump that sends out working oil from the oil tank; a braking unit that releases a braking target provided in a hoisting machine of an elevator by pressurizing hydraulic oil, and brakes the braking target by depressurizing the hydraulic oil; a 1 st switch provided in an open/close circuit including a pressurization path and a depressurization path, the pressurization path being a path from the oil tank to the brake unit via the pump, and the depressurization path being a path from the brake unit to the oil tank, the pressurization path and the depressurization path being selectively switched; and a 2 nd switch that selectively switches between an exhaust circuit and the open/close circuit, the exhaust circuit reaching the tank from the tank via the pump and the braking unit in a state of braking the braked body so as to pass through the pressurizing path and the depressurizing path.
Effects of the invention
In the case of the hydraulic brake device for an elevator hoisting machine according to the present invention, accumulation of gas can be eliminated more easily.
Drawings
Fig. 1 is a structural diagram of an elevator according to embodiment 1.
Fig. 2 is a structural diagram of the hydraulic brake device according to embodiment 1.
Fig. 3 is a diagram showing a hydraulic circuit of the hydraulic unit of embodiment 1.
Fig. 4 is a diagram showing a hydraulic circuit of the hydraulic unit of embodiment 1.
Fig. 5 is a diagram showing a hydraulic circuit of the hydraulic unit of embodiment 1.
Fig. 6 is a flowchart showing an example of the operation of the hydraulic brake device according to embodiment 1.
Fig. 7 is a hardware configuration diagram of a main part of the control device according to embodiment 1.
Description of the reference numerals
1: an elevator; 2: a hoistway; 3: a traction machine; 4: a main rope; 5: a car; 6: a counterweight; 7: a control panel; 8: a traction machine motor; 9: a drive sheave; 10: a hydraulic braking device; 11: a brake disc; 12: a hydraulic unit; 13: a brake caliper; 14: an oil tank; 15: a pump; 16: a 1 st electromagnetic valve; 17: a 2 nd electromagnetic valve; 18: a variable throttle valve; 19: a measuring device; 20: a control device; 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h: a valve port; 22: a high pressure line; 23: an accumulator; 100a: a processor; 100b: a memory; 200: dedicated hardware.
Detailed Description
The manner in which the objects of the present invention are implemented will be described with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and repetitive description thereof will be appropriately simplified or omitted. The object of the present invention is not limited to the following embodiments, and modifications of any of the components of the embodiments or omission of any of the components of the embodiments can be made without departing from the scope of the present invention.
Embodiment 1
Fig. 1 is a structural diagram of an elevator 1 according to embodiment 1.
The elevator 1 is applied to, for example, a building having a plurality of floors. In a building, a hoistway 2 of an elevator 1 is provided. The hoistway 2 is a vertically long space extending across a plurality of floors. The elevator 1 includes a hoisting machine 3, main ropes 4, a car 5, a counterweight 6, and a control panel 7.
The hoisting machine 3 is disposed, for example, at an upper portion or a lower portion of the hoistway 2. The hoisting machine 3 includes: a traction machine motor 8 that generates a driving force; and a drive sheave 9 that rotates by the driving force generated by the hoisting machine motor 8. In the hoisting machine 3, a hydraulic brake device 10 is applied. The hydraulic brake device 10 may be an internal device that forms a part of the hoisting machine 3, or may be an external device that is applied to the hoisting machine 3. The hydraulic brake device 10 is a device for braking rotation of the drive sheave 9.
The main ropes 4 are wound around a drive sheave 9. The main ropes 4 support the load of the car 5 on one side of the drive sheave 9. The main ropes 4 support the load of the counterweight 6 on the other side of the drive sheave 9. The main rope 4 is moved so as to be pulled on either side of the drive sheave 9 by the driving force generated by the hoisting machine motor 8.
The car 5 is a device that travels in the vertical direction in the hoistway 2 to convey a user of the elevator 1 or the like between a plurality of floors. The counterweight 6 is a device for balancing the load applied to both sides of the drive sheave 9 with respect to the car 5. The car 5 and the counterweight 6 travel in opposite directions to each other in the vertical direction in the hoistway 2 in conjunction with the movement of the main ropes 4.
The control panel 7 is a device for controlling the operation of the elevator 1. The control panel 7 is disposed, for example, at an upper portion or a lower portion of the hoistway 2. The operation of the elevator 1 controlled by the control panel 7 includes, for example, traveling of the car 5 by the hoisting machine 3, braking of the drive sheave 9 of the hoisting machine 3, and the like. The control panel 7 is connected to the hoisting machine 3, the car 5, and the like so that a control signal of the elevator 1 can be output and information on the state of the elevator 1 can be obtained.
Fig. 2 is a structural diagram of the hydraulic brake device 10 according to embodiment 1.
A brake disc 11 is attached to the drive sheave 9 of the hoisting machine 3. The drive sheave 9 and the brake disc 11 rotate integrally with the rotation shaft of the hoisting machine motor 8.
The hydraulic brake device 10 includes a hydraulic unit 12 and a caliper 13. The hydraulic unit 12 is a unit that supplies hydraulic pressure using hydraulic oil. The hydraulic unit 12 supplies hydraulic pressure to the brake caliper 13. The brake caliper 13 grips the brake disc 11 by the elastic force of a spring or the like when the hydraulic oil is depressurized by the hydraulic unit 12, for example. The brake caliper 13 brakes the brake disc 11 and the drive sheave 9 by friction generated by gripping the brake disc 11. The brake caliper 13 releases the grip of the brake disc 11 against the elastic force of the spring, for example, when the hydraulic oil has been pressurized by the hydraulic unit 12. The brake caliper 13 releases the brake disc 11 and the drive sheave 9 by releasing the grip of the brake disc 11. The brake disc 11 is an example of a braked body. The brake caliper 13 is an example of a braking portion of the hydraulic brake device 10.
The control panel 7 outputs a command signal to the hydraulic unit 12 to control release and braking of the drive sheave 9. The command signal output by the control panel 7 to the hydraulic unit 12 contains, for example, a release command. In this example, the release command is a command for releasing the grip of the brake caliper 13 on the brake disc 11. The control panel 7 can also switch the operating mode of the elevator 1. The operation mode includes, for example, normal operation, suspension of operation, and the like. The normal operation is, for example, an operation mode in which the car 5 can be driven so that a user or the like can be transported between a plurality of floors. The operation suspension is an operation mode or the like in which the running of the car 5 is suspended in a state in which the running is stopped in order to save energy consumption, for example, in a period in which there is little user, such as late night or on a holiday.
Fig. 3 to 5 are diagrams showing the hydraulic circuit of the hydraulic unit 12 of embodiment 1.
In fig. 3, the hydraulic unit 12 is shown in a state in which the brake caliper 13 releases the grip of the brake disc 11.
The hydraulic unit 12 includes a tank 14, a pump 15, a 1 st electromagnetic valve 16, a 2 nd electromagnetic valve 17, a variable throttle valve 18, a measuring device 19, and a control device 20.
The oil tank 14 is a device for storing hydraulic oil in the hydraulic circuit.
The pump 15 is a device for sending the hydraulic oil of the hydraulic circuit from the oil tank 14. The pump 15 is driven by an electric motor.
The 1 st solenoid valve 16 is a device for switching the flow path of the hydraulic oil. In this example, the 1 st solenoid valve 16 has a valve port 21a, a valve port 21b, a valve port 21c, and a valve port 21d, and is a 4-port 2 position valve that switches between a pressurized position and a depressurized position. In fig. 3, the 1 st solenoid valve 16 is shown in a pressurized position. In the 1 st electromagnetic valve 16 pressurized position, the valve port 21a and the valve port 21b are connected, and the valve port 21c and the valve port 21d are connected. The 1 st electromagnetic valve 16 has a check valve that prevents the flow of the working oil from the valve port 21d to the valve port 21c in the pressurized position. The 1 st electromagnetic valve 16 is switched to the pressurizing position due to the excitation of the solenoid. When the solenoid is not excited, the 1 st electromagnetic valve 16 is switched to the pressure-removing position by the elastic force of the spring.
The 2 nd solenoid valve 17 is a device for switching the flow path of the hydraulic oil. In this example, the 2 nd solenoid valve 17 has a valve port 21e, a valve port 21f, a valve port 21g, and a valve port 21h, and is a 4-port 2 position valve that switches between a normal operation position and an exhaust position. Fig. 3 shows the 2 nd solenoid valve 17 in a state of a normal operation position. In the normal operation position of the 2 nd electromagnetic valve 17, the valve port 21e and the valve port 21f are connected, and the valve port 21g and the valve port 21h are connected. The 2 nd electromagnetic valve 17 has a check valve that prevents the flow of the working oil from the valve port 21e to the valve port 21f in the state of being in the normal operation position. The 2 nd electromagnetic valve 17 is switched to the exhaust position due to the excitation of the solenoid. When the solenoid is not excited, the 2 nd electromagnetic valve 17 is switched to the normal operation position by the elastic force of the spring.
The hydraulic unit 12 is provided with a flow path through which the hydraulic oil flows. In the hydraulic unit 12, a part or all of the flow path connecting the respective devices is formed of, for example, a high-pressure pipe. In this example, a flow path connecting the inlet of the tank 14 and the pump 15, a flow path connecting the outlet of the pump 15 and the valve port 21f of the 2 nd solenoid valve 17, a flow path connecting the valve port 21e of the 2 nd solenoid valve 17 and the valve port 21b of the 1 st solenoid valve 16, a flow path connecting the valve port 21a of the 1 st solenoid valve 16 and the brake caliper 13, a flow path connecting the brake caliper 13 and the valve port 21d of the 1 st solenoid valve 16, a flow path connecting the valve port 21c of the 1 st solenoid valve 16 and the valve port 21h of the 2 nd solenoid valve 17, and a flow path connecting the valve port 21g of the 2 nd solenoid valve 17 and the tank 14 are provided.
In the hydraulic unit 12, a flow path from an outlet of the pump 15 to the brake caliper 13 is connected to a high-pressure line 22. The high-pressure line 22 forms a flow path through which the working oil flows. In this example, the high-pressure line 22 is connected to a flow path connecting the valve port 21e of the 2 nd solenoid valve 17 and the valve port 21b of the 1 st solenoid valve 16. In this example, the side of the high-pressure pipe 22 connected to the flow path is referred to as the upstream side, and the opposite side is referred to as the downstream side.
The variable throttle 18 is provided in the high-pressure line 22. The measuring device 19 is provided downstream of the variable throttle valve 18 in the high-pressure line 22. The measuring device 19 measures the pressure of the working oil. The measuring device 19 comprises, for example, a pressure sensor.
The control device 20 is a device that controls the operation of the hydraulic unit 12. The control device 20 controls, for example, switching between excitation and non-excitation of the solenoid, and starting and stopping of the pump 15. The control device 20, for example, outputs an excitation signal to a solenoid to excite the solenoid. The control device 20 outputs excitation signals to solenoids of, for example, the 1 st solenoid valve 16 and the 2 nd solenoid valve 17. The control device 20 obtains a measured value of the pressure of the hydraulic oil measured by the measuring device 19. The control device 20 receives input of a control signal such as a release command from the control panel 7. The control device 20 outputs an excitation signal or the like based on the measured value of the measuring device 19, a control signal from the control panel 7, or the like, for example.
The hydraulic unit 12 is provided with an accumulator 23. The accumulator 23 is provided in the high-pressure line 22, for example. The accumulator 23 is a gas accumulator such as a balloon type, a piston type, or a diaphragm type. The hydraulic unit 12 may also be provided with other accumulators. The hydraulic unit 12 may be provided with a plurality of accumulators. The hydraulic unit 12 may be provided with an accumulator provided in another flow path of the high-pressure line 22.
Next, an example of the operation of the hydraulic brake device 10 at the time of release will be described with reference to fig. 3.
In the normal operation of the elevator 1, the 2 nd electromagnetic valve 17 is in the normal operation position. The control panel 7 releases the hydraulic brake device 10 to the drive sheave 9 when the car 5 is driven in the normal operation or the like. At this time, the control panel 7 outputs a release instruction to the control device 20 of the hydraulic unit 12. The control device 20 that receives the release instruction outputs a control signal indicating activation to the pump 15, and outputs an excitation signal to the solenoid of the 1 st electromagnetic valve 16. The solenoid of the 1 st electromagnetic valve 16 is excited, so that the 1 st electromagnetic valve 16 is switched to the pressurizing position.
The hydraulic pressure is supplied by the activated pump 15 by flowing the hydraulic oil in the order of the tank 14, the pump 15, the valve ports 21f and 21e of the 2 nd electromagnetic valve 17, the valve ports 21b and 21a of the 1 st electromagnetic valve 16, and the brake caliper 13. The path through which the hydraulic oil flows is an example of a pressurized path from the oil tank 14 to the caliper 13 via the pump 15. The discharge of the working oil from the caliper 13 is prevented by a check valve that prevents the flow of the working oil from the valve port 21d to the valve port 21c of the 1 st electromagnetic valve 16. Therefore, in the pressurized path including the brake caliper 13, the hydraulic oil is accumulated. Further, since the upstream side of the high-pressure pipe 22 is connected to the pressurizing path, the working oil is accumulated in the high-pressure pipe 22. At this time, the accumulator 23 provided in the high-pressure pipe 22 is accumulated.
The brake caliper 13 releases the grip of the brake disc 11 against the elastic force of the spring by the pressure of the working oil supplied from the oil tank 14 via the pressurizing path.
Next, an example of the operation of the hydraulic brake device 10 during braking will be described with reference to fig. 4.
In fig. 4, a hydraulic unit 12 is shown in a state in which a brake caliper 13 grips a brake disc 11.
In the normal operation of the elevator 1, the 2 nd electromagnetic valve 17 is in the normal operation position. The control panel 7 causes the hydraulic brake device 10 to brake the drive sheave 9 when stopping the car 5 in the normal operation or the like. At this time, the control panel 7 outputs a braking command to the control device 20 of the hydraulic unit 12. Alternatively, the control panel 7 may perform the braking command by stopping the output of the release command to the hydraulic unit 12. The control device 20 that receives the braking command outputs a control signal indicating a stop to the pump 15 to stop the output of the excitation signal to the solenoid of the 1 st electromagnetic valve 16. Since the excitation of the solenoid of the 1 st electromagnetic valve 16 is stopped, the 1 st electromagnetic valve 16 is switched to the pressure-removing position by the elastic force of the spring. In fig. 4, the 1 st solenoid valve 16 is shown in a state of the pressure release position.
In the pressure-removing position of the 1 st solenoid valve 16, the valve port 21a and the valve port 21b are connected, and the valve port 21c and the valve port 21d are connected. The 1 st solenoid valve 16 has a check valve that prevents the flow of the working oil from the valve port 21a to the valve port 21b in the state of being in the pressure-release position.
The hydraulic oil is discharged from the brake caliper 13 by the pressure accumulated in the hydraulic oil of the brake caliper 13. At this time, the check valve that prevents the flow of the hydraulic oil from the valve port 21e to the valve port 21f of the 2 nd electromagnetic valve 17 prevents the backflow of the hydraulic oil to the pump 15. The hydraulic oil flows in the order of the brake caliper 13, the ports 21d and 21c of the 1 st solenoid valve 16, and the ports 21h and 21g of the 2 nd solenoid valve 17, and is discharged to the reservoir 14. The path through which the hydraulic oil flows at this time is an example of a relief path from the brake caliper 13 to the oil tank 14. Thus, the 1 st solenoid valve 16 selectively switches between the pressurizing path and the depressurizing path as a path through which the hydraulic oil flows. The 1 st solenoid valve 16 is an example of a 1 st switch.
The brake caliper 13 discharges the working oil from the brake caliper 13 through the pressure-removing path, thereby gripping the brake disc 11 by the elastic force of the spring.
Here, the hydraulic oil is supplied from the oil tank 14 to the brake caliper 13 through the pressurizing path at the time of release of the hydraulic brake device 10, and is discharged from the brake caliper 13 to the oil tank 14 through the depressurizing path at the time of braking of the hydraulic brake device 10. In this way, the pressurizing path and the pressure-removing path are included in the hydraulic circuit as a part of the hydraulic circuit. A hydraulic circuit including a pressurizing path and a depressurizing path is an example of an open-close circuit.
Further, the hydraulic oil in the high-pressure line 22 is accumulated until the hydraulic brake device 10 brakes the drive sheave 9. When the hydraulic brake device 10 brakes the drive sheave 9, the hydraulic oil is prevented from being discharged from the high-pressure line 22 by a check valve that prevents the flow of hydraulic oil from the valve port 21b to the valve port 21a of the 1 st electromagnetic valve 16 and a check valve that prevents the flow of hydraulic oil from the valve port 21e to the valve port 21f of the 2 nd electromagnetic valve 17. Therefore, the hydraulic oil in the high-pressure pipe 22 is kept in a state after being accumulated. The accumulator 23 provided in the high-pressure pipe 22 is kept in a state after being accumulated. The hydraulic oil in the high-pressure pipe 22 and the accumulator 23 may supply the accumulated hydraulic pressure to the caliper 13 when the hydraulic brake device 10 releases the drive sheave 9 again.
However, for example, gas permeation may occur in the accumulator 23 or the like provided in the high-pressure line 22. At this time, gas may be accumulated in the hydraulic oil due to permeation of gas from the accumulator 23 or the like. Since gas is accumulated in the hydraulic oil, the operation of the hydraulic brake device 10 may be slow.
Therefore, the control device 20 monitors the accumulation of gas in the hydraulic oil by monitoring the measured value of the pressure of the hydraulic oil measured by the measuring device 19. The control device 20 measures the hydraulic pressure application time when the hydraulic brake device 10 releases the drive sheave 9. Here, the hydraulic pressure application time means a time from the output of the release command until the pressure of the hydraulic oil reaches a preset pressure threshold. When receiving the release command from the control panel 7, the control device 20 starts the measurement of the hydraulic pressure application time. The control device 20 monitors the measured value of the pressure of the hydraulic oil measured by the measuring device 19. When the measured value of the pressure of the hydraulic oil reaches the pressure threshold value, the control device 20 ends the measurement of the hydraulic pressure application time. The control device 20 compares the length of the measured hydraulic pressure application time with a time threshold value set in advance. When the length of the hydraulic pressure application time exceeds the time threshold, control device 20 determines that the accumulation of gas in the hydraulic oil has progressed to the point where the exhaust gas treatment is required. At this time, control device 20 activates the exhaust gas implementation flag. In this example, after the exhaust gas execution flag is set to be on, the control device 20 does not immediately perform the exhaust gas treatment, but continues the normal operation. For example, when the control panel 7 switches the operation mode to the operation suspension state according to the time period or the like, the control device 20 determines whether or not the exhaust gas implementation flag is valid. When the exhaust gas implementation flag is on, the control device 20 executes exhaust gas treatment. After the exhaust gas treatment is performed, the control device 20 deactivates the exhaust gas implementation flag.
Next, an example of the operation of the hydraulic brake device 10 during the exhaust gas treatment will be described with reference to fig. 5.
In fig. 5, the hydraulic unit 12 is shown at the time of exhaust gas treatment.
The exhaust treatment is performed when the car 5 is stopped, that is, when the hydraulic brake device 10 brakes the drive sheave 9. At this time, the 1 st solenoid valve 16 is in the decompression position. When the exhaust gas treatment is performed, the control device 20 outputs a control signal indicating the start to the pump 15, and outputs an excitation signal to the solenoid of the 2 nd electromagnetic valve 17. The 2 nd electromagnetic valve 17 is switched to the exhaust position due to the solenoid excitation of the 2 nd electromagnetic valve 17. In fig. 5, the 2 nd solenoid valve 17 is shown in a state of being in the exhaust position.
In the exhaust position of the 2 nd electromagnetic valve 17, the valve port 21e is connected to the valve port 21g, and the valve port 21f is connected to the valve port 21 h.
The hydraulic oil is caused to flow in the order of the tank 14, the pump 15, the ports 21f and 21h of the 2 nd solenoid valve 17, and the ports 21c and 21d of the 1 st solenoid valve 16 by the activated pump 15 to reach the brake caliper 13. The hydraulic oil is thus discharged from the brake caliper 13 to the reservoir 14 in the order of the ports 21a and 21b of the 1 st electromagnetic valve 16 and the ports 21e and 21g of the 2 nd electromagnetic valve 17. The hydraulic circuit in which the hydraulic oil flows at this time is an example of a bleed circuit that reaches the oil tank 14 again from the oil tank 14 via the pump 15 and the brake caliper 13. The exhaust circuit is a hydraulic circuit that passes through the pressurizing path and the depressurizing path. The direction in which the working oil flows through the brake caliper 13 on the exhaust circuit is opposite to the direction in which the working oil flows through the brake caliper 13 on the opening/closing circuit. Thus, the 2 nd solenoid valve 17 selectively switches between the normal operation circuit and the exhaust circuit as the hydraulic circuit through which the hydraulic oil flows. The 2 nd solenoid valve 17 is an example of a 2 nd switch.
During the exhaust gas treatment, the control device 20 activates the pump 15 to circulate the hydraulic oil in the exhaust gas circuit. The flow of the working oil circulating in the exhaust circuit after exiting the oil tank 14 until returning to the oil tank 14 is not hindered by a check valve or the like. As a result, the hydraulic oil flows through the brake caliper 13 in the opposite direction to the normal operation and is discharged to the oil tank 14, and therefore, the gas accumulated in the hydraulic oil in the hydraulic circuit is discharged to the oil tank 14. In this way, by switching the hydraulic circuit using the 2 nd electromagnetic valve 17, accumulation of gas in the hydraulic oil can be easily eliminated.
When the stop condition of the exhaust treatment is satisfied, the control device 20 outputs a control signal indicating a stop to the pump 15, and stops the output of the excitation signal to the solenoid of the 2 nd electromagnetic valve 17. Since the excitation of the solenoid of the 2 nd electromagnetic valve 17 is stopped, the 2 nd electromagnetic valve 17 is switched to the normal operation position by the elastic force of the spring. The stop condition of the exhaust gas treatment is, for example, a condition when a predetermined time has elapsed from the excitation of the solenoid of the 2 nd electromagnetic valve 17. Alternatively, the stop condition of the exhaust gas treatment may be a condition based on the flow rate of the hydraulic oil sent from the pump 15 or other measured values.
The control device 20 may stop the pump 15 after the 2 nd electromagnetic valve 17 is switched to the normal operation position. After the 2 nd electromagnetic valve 17 is switched to the normal operation position, the discharge of the hydraulic oil from the high-pressure line 22 is prevented by the check valve that prevents the flow of the hydraulic oil from the valve port 21b to the valve port 21a of the 1 st electromagnetic valve 16 and the check valve that prevents the flow of the hydraulic oil from the valve port 21e to the valve port 21f of the 2 nd electromagnetic valve 17. On the other hand, the check valve of the 2 nd electromagnetic valve 17 does not obstruct the inflow of the hydraulic oil to the high-pressure line 22. Therefore, the hydraulic oil in the high-pressure pipe 22 is accumulated. Further, an accumulator 23 provided in the high-pressure pipe 22 is accumulated. The control device 20 stops the pump 15 after a predetermined time elapses from when the 2 nd electromagnetic valve 17 is switched to the normal operation position, for example. Alternatively, for example, after the 2 nd electromagnetic valve 17 is switched to the normal operation position, the control device 20 may stop the pump 15 when the measured value of the pressure of the hydraulic oil measured by the measuring device 19 reaches a preset pressure.
Next, an example of the operation of the hydraulic brake device 10 will be described with reference to fig. 6.
Fig. 6 is a flowchart showing an example of the operation of the hydraulic brake device 10 according to embodiment 1.
For example, at the beginning of the process of FIG. 6, solenoid valve 1 16 is in the pressurized position. The 2 nd solenoid valve 17 is in the normal operation position. The exhaust implementation flag is inactive.
In step S01, the control device 20 determines whether or not the operation mode of the control panel 7 is set to the operation suspension. If the determination result is no, the process of the hydraulic brake device 10 proceeds to step S02. On the other hand, when the determination result is yes, the process of the hydraulic brake device 10 proceeds to step S10.
In step S02, the control device 20 determines whether or not a release instruction is received from the control panel 7. If the determination result is no, the process of the hydraulic brake device 10 proceeds to step S01. On the other hand, when the determination result is yes, the process of the hydraulic brake device 10 proceeds to step S03.
In step S03, the control device 20 outputs a control signal indicating activation to the pump 15, and outputs an excitation signal to the solenoid of the 1 st electromagnetic valve 16. Then, the process of the hydraulic brake device 10 advances to step S04.
In step S04, control device 20 starts measurement of the hydraulic pressure application time. Then, the process of the hydraulic brake device 10 advances to step S05.
In step S05, the control device 20 determines whether or not the pressure of the hydraulic oil measured by the measuring device 19 reaches the pressure threshold value. If the determination result is no, the process of the hydraulic brake device 10 proceeds to step S05, and the measurement of the hydraulic pressure application time is continued. On the other hand, when the determination result is yes, the measurement of the hydraulic pressure application time is completed, and the control device 20 sets the time from the start of the measurement to the end thereof as the length of the hydraulic pressure application time. Then, the process of the hydraulic brake device 10 advances to step S06.
In step S06, control device 20 determines whether or not the hydraulic pressure application time exceeds the time threshold. If the determination result is yes, the process of the hydraulic brake device 10 proceeds to step S07. On the other hand, when the determination result is no, the process of the hydraulic brake device 10 proceeds to step S08.
In step S07, control device 20 activates the exhaust gas implementation flag. Then, the process of the hydraulic brake device 10 advances to step S08.
In step S08, the control device 20 determines whether or not a brake command is received from the control panel 7. The control device 20 may determine that the brake command from the control panel 7 is received when the release command from the control panel 7 is stopped. When the control device 20 determines that the braking instruction is not received, the process of the hydraulic brake device 10 proceeds to step S08 again. On the other hand, when the determination result is yes, the process of the hydraulic brake device 10 proceeds to step S09.
In step S09, the control device 20 outputs a control signal indicating a stop to the pump 15, and stops the excitation signal output to the solenoid of the 1 st electromagnetic valve 16. Then, the process of the hydraulic brake device 10 advances to step S01.
In step S10, control device 20 determines whether or not the exhaust gas implementation flag is valid. If the determination result is no, the process of the hydraulic brake device 10 proceeds to step S01. On the other hand, when the determination result is yes, the process of the hydraulic brake device 10 proceeds to step S11.
In step S11, the control device 20 outputs a control signal indicating start-up to the pump 15, and outputs an excitation signal to the solenoid of the 2 nd electromagnetic valve 17. Then, the process of the hydraulic brake device 10 advances to step S12.
In step S12, control device 20 determines whether or not the stop condition of the exhaust gas treatment is satisfied. For example, when a predetermined time elapses from when the 2 nd electromagnetic valve 17 is switched to the exhaust position, the control device 20 may determine that the condition for stopping the exhaust gas treatment is satisfied. When the stop condition is not satisfied, the process of the hydraulic brake device 10 proceeds to step S12 again. On the other hand, when the stop condition is satisfied, the process of the hydraulic brake device 10 proceeds to step S13.
In step S13, the control device 20 outputs a control signal indicating a stop to the pump 15, and stops the excitation signal output to the solenoid of the 2 nd electromagnetic valve 17. Then, the process of the hydraulic brake device 10 advances to step S14.
In step S14, control device 20 deactivates the exhaust gas implementation flag. Then, the process of the hydraulic brake device 10 advances to step S01.
As described above, the hydraulic brake device 10 according to embodiment 1 includes the oil tank 14, the pump 15, the brake caliper 13, the 1 st solenoid valve 16, and the 2 nd solenoid valve 17. The oil tank 14 stores working oil. The pump 15 sends the hydraulic oil from the oil tank 14. The hoisting machine 3 of the elevator 1 is provided with a brake disc 11. The brake caliper 13 releases the brake disc 11 by pressurizing the hydraulic oil, and brakes the brake disc 11 by depressurizing the hydraulic oil. The 1 st electromagnetic valve 16 is provided in an open/close circuit including a pressurizing path and a depressurizing path. The pressurization path is a path from the oil tank 14 to the caliper 13 via the pump 15. The pressure release path is a path from the brake caliper 13 to the oil tank 14. The 1 st solenoid valve 16 selectively switches the pressurization path and the pressurization path. The 2 nd solenoid valve 17 selectively switches the exhaust circuit and the open/close circuit. The exhaust circuit is a circuit that reaches the oil tank 14 from the oil tank 14 through the pump 15 and the brake caliper 13 in a state of braking the brake disc 11 so as to pass through the pressurization path and the depressurization path.
With this configuration, the exhaust circuit and the open/close circuit can be easily switched by the 2 nd electromagnetic valve 17. The flow of the working oil circulating in the exhaust circuit after exiting the oil tank 14 until returning to the oil tank 14 is not hindered by a valve or the like. In the exhaust circuit, the working oil is returned from the oil tank 14 to the oil tank 14 via the brake caliper 13 by way of the pressurizing path and the depressurizing path by the pump 15. Therefore, the gas accumulated in the hydraulic oil in the brake caliper 13 is easily discharged to the oil tank 14 through the pressurizing path and the depressurizing path. The 2 nd electromagnetic valve 17 switches between the open/close circuit and the exhaust circuit by excitation of the solenoid. This makes it possible to switch the open/close circuit and the exhaust circuit in response to a control signal from the control panel 7 or the like.
The hydraulic brake device 10 further includes a measuring device 19 and a control device 20. The measuring device 19 measures the pressure of the hydraulic oil. The control device 20 switches the exhaust circuit and the open/close circuit by the 2 nd electromagnetic valve 17 according to the pressure measured by the measuring device 19.
The control device 20 measures a time from when the command to release the brake disc 11 is output to when the pressure measured by the measurement device 19 reaches a preset pressure threshold value. When the measured time exceeds a preset time threshold, the control device 20 causes the 2 nd electromagnetic valve 17 to switch between the exhaust circuit and the open/close circuit.
With this configuration, the hydraulic brake device 10 can detect that gas is accumulated in the hydraulic fluid to such an extent that the operation of the hydraulic brake device 10 becomes slow, and at this time, can perform the exhaust gas treatment. Thus, the exhaust gas treatment in the hydraulic oil is automated, and no periodic exhaust gas work by maintenance personnel is required. This can improve the maintainability of the hydraulic brake device 10. Further, since the exhaust operation is not performed as a maintenance operation, occurrence of an error or the like in the maintenance operation can be suppressed. Further, since the exhaust gas treatment is performed by monitoring the state of the operation delay of the hydraulic brake device 10, the start delay of the elevator 1 is less likely to occur. The exhaust gas treatment may be performed during a period in which the car 5 is stopped during the normal operation of the elevator 1.
The control device 20 also switches the exhaust circuit and the open/close circuit by the 2 nd electromagnetic valve 17 during the suspension of the operation of the elevator 1.
With this configuration, the exhaust gas treatment can be performed while suppressing the influence on the convenience of the user or the like.
The direction in which the working oil flows through the brake caliper 13 in the exhaust circuit is opposite to the direction in which the working oil flows through the brake caliper 13 in the opening/closing circuit.
With this configuration, the gas accumulated in the hydraulic fluid of the brake caliper 13 is easily discharged by braking and releasing of the hydraulic brake device 10.
The hydraulic brake device 10 may not be a disc brake having the brake disc 11 gripped by the brake caliper 13. The hydraulic brake device 10 may be, for example, a drum brake or the like. The switching between the pressurizing path and the depressurizing path may not be performed by the solenoid valve. The switching between the pressurization path and the depressurization path may be performed by, for example, pilot-operated switching valves. The switching between the open/close circuit and the exhaust circuit may not be performed by the solenoid valve. Switching between the open/close circuit and the exhaust circuit may be performed by, for example, pilot-operated switching valves.
Next, an example of the hardware configuration of the control device 20 will be described with reference to fig. 7.
Fig. 7 is a hardware configuration diagram of a main part of control device 20 according to embodiment 1.
The functions of the control device 20 may be implemented by a processing circuit. The processing circuit is provided with at least one processor 100a and at least one memory 100b. The processing circuit may include the processor 100a, the memory 100b, and at least one dedicated hardware 200, or the processing circuit may include at least one dedicated hardware 200 instead of the processor 100a and the memory 100b.
In the case where the processing circuit includes the processor 100a and the memory 100b, each function of the control device 20 is implemented by software, firmware, or a combination of software and firmware. At least one of the software and the firmware is described as a program. The program is stored in the memory 100b. The processor 100a reads out and executes a program stored in the memory 100b to realize the respective functions of the control device 20.
The processor 100a is also called a CPU (Central Processing Unit: central processing unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP. The Memory 100b is constituted by a nonvolatile or volatile semiconductor Memory such as RAM (Random Access Memory: random access Memory), ROM (Read Only Memory), flash Memory, EPROM (Erasable Programmable Read Only Memory: erasable programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory: electrically erasable programmable Read Only Memory), or the like.
In the case of a processing circuit provided with dedicated hardware 200, the processing circuit is implemented, for example, by a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit: application specific integrated circuit), an FPGA (Field Programmable Gate Array: field programmable gate array), or a combination thereof.
The functions of the control device 20 can be realized by a processing circuit. Alternatively, the functions of the control device 20 may be realized by a processing circuit. With respect to each function of the control device 20, a part may be realized by the dedicated hardware 200, and the other part may be realized by software or firmware. Thus, the processing circuitry implements the functions of the control device 20 via dedicated hardware 200, software, firmware, or a combination thereof.
To summarize the above description, the structures that can be adopted by the technique of the present invention include the structures and the like shown below as additional notes.
(additionally, 1)
A hydraulic brake device for an elevator hoisting machine, wherein the hydraulic brake device for an elevator hoisting machine comprises:
a tank for storing working oil;
a pump that sends out working oil from the oil tank;
a braking unit that releases a braking target provided in a hoisting machine of an elevator by pressurizing hydraulic oil, and brakes the braking target by depressurizing the hydraulic oil;
a 1 st switch provided in an open/close circuit including a pressurization path and a depressurization path, the pressurization path being a path from the oil tank to the brake unit via the pump, and the depressurization path being a path from the brake unit to the oil tank, the pressurization path and the depressurization path being selectively switched; and
and a 2 nd switch that selectively switches between an exhaust circuit and the open/close circuit, wherein the exhaust circuit reaches the tank from the tank via the pump and the braking unit in a state of braking the object to be braked so as to pass through the pressurizing path and the depressurizing path.
(additionally remembered 2)
The hydraulic brake device for an elevator hoisting machine according to supplementary note 1, wherein,
the 2 nd switcher is a solenoid valve.
(additionally, the recording 3)
The hydraulic brake device for an elevator hoisting machine according to supplementary note 1 or 2, wherein,
the hydraulic brake device for an elevator hoisting machine comprises:
a measuring device that measures the pressure of the hydraulic oil; and
and a control device that causes the 2 nd switch to switch between the exhaust circuit and the open/close circuit based on the pressure measured by the measuring device.
(additionally remembered 4)
The hydraulic brake device for an elevator hoisting machine according to supplementary note 3, wherein,
the control device causes the 2 nd switch to switch between the exhaust circuit and the open/close circuit when a time from outputting a command to release the braked body until the pressure measured by the measuring device reaches a preset pressure threshold exceeds a preset time threshold.
(additionally noted 5)
The hydraulic brake device for an elevator traction machine according to supplementary note 3 or 4, wherein,
the control device causes the 2 nd switch to switch between the exhaust circuit and the open/close circuit during suspension of the elevator operation.
(additionally described 6)
The hydraulic brake device for an elevator hoisting machine according to any one of supplementary notes 1 to 5, wherein,
the direction in which the working oil flows through the brake portion on the exhaust circuit is opposite to the direction in which the working oil flows through the brake portion on the opening/closing circuit.

Claims (6)

1. A hydraulic brake device for an elevator hoisting machine, wherein the hydraulic brake device for an elevator hoisting machine comprises:
a tank for storing working oil;
a pump that sends out working oil from the oil tank;
a braking unit that releases a braking target provided in a hoisting machine of an elevator by pressurizing hydraulic oil, and brakes the braking target by depressurizing the hydraulic oil;
a 1 st switch provided in an open/close circuit including a pressurization path and a depressurization path, the pressurization path being a path from the oil tank to the brake unit via the pump, and the depressurization path being a path from the brake unit to the oil tank, the pressurization path and the depressurization path being selectively switched; and
and a 2 nd switch that selectively switches between an exhaust circuit and the open/close circuit, wherein the exhaust circuit reaches the tank from the tank via the pump and the braking unit in a state of braking the object to be braked so as to pass through the pressurizing path and the depressurizing path.
2. The hydraulic brake device for an elevator traction machine according to claim 1, wherein,
the 2 nd switcher is a solenoid valve.
3. The hydraulic brake device for an elevator traction machine according to claim 1, wherein,
the hydraulic brake device for an elevator hoisting machine comprises:
a measuring device that measures the pressure of the hydraulic oil; and
and a control device that causes the 2 nd switch to switch between the exhaust circuit and the open/close circuit based on the pressure measured by the measuring device.
4. The hydraulic brake device for an elevator traction machine according to claim 3, wherein,
the control device causes the 2 nd switch to switch between the exhaust circuit and the open/close circuit when a time from outputting a command to release the braked body until the pressure measured by the measuring device reaches a preset pressure threshold exceeds a preset time threshold.
5. The hydraulic brake device for an elevator traction machine according to claim 3, wherein,
the control device causes the 2 nd switch to switch between the exhaust circuit and the open/close circuit during suspension of the elevator operation.
6. The hydraulic brake device for an elevator traction machine according to any one of claims 1 to 5, wherein,
the direction in which the working oil flows through the brake portion on the exhaust circuit is opposite to the direction in which the working oil flows through the brake portion on the opening/closing circuit.
CN202210936977.9A 2022-04-26 2022-08-05 Hydraulic braking device for elevator traction machine Pending CN116986507A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-072504 2022-04-26
JP2022072504A JP7243896B1 (en) 2022-04-26 2022-04-26 Hydraulic brake system for elevator hoist

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CN116986507A true CN116986507A (en) 2023-11-03

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Application Number Title Priority Date Filing Date
CN202210936977.9A Pending CN116986507A (en) 2022-04-26 2022-08-05 Hydraulic braking device for elevator traction machine

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JP (1) JP7243896B1 (en)
CN (1) CN116986507A (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07206323A (en) * 1994-01-25 1995-08-08 Hitachi Building Syst Eng & Service Co Ltd Control device for hydraulic elevator
EP3608356A4 (en) 2017-04-06 2021-01-13 Nitto Denko Corporation Film for millimeter-wave antenna
JP7004087B2 (en) * 2018-11-27 2022-01-21 三菱電機株式会社 Hydraulic brakes and elevators

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