Hydraulic brake device for elevator hoist machine

Abstract

A hydraulic brake device for an elevator hoisting machine can more easily eliminate accumulation of gas. A brake caliper (13) releases a brake disc (11) by pressurization of working oil and brakes by depressurization of the working oil. A first solenoid valve (16) is provided in an opening and closing circuit that includes a pressurization path and a depressurization path. The pressurization path is a path from a tank (14) to the brake caliper (13) via a pump (15). The depressurization path is a path from the brake caliper (13) to the tank (14). The first solenoid valve (16) selectively switches the pressurization path and the depressurization path. A second solenoid valve (17) selectively switches a gas discharge circuit and the opening and closing circuit. The gas discharge circuit is a circuit that reaches the tank (14) from the tank (14) via the pump (15) and the brake caliper (13) in a state of braking the brake disc (11) by way of the pressurization path and the depressurization path.

Description

Technical Field

[0001] This invention relates to a hydraulic braking device for elevator traction machines. Background Technology

[0002] Patent Document 1 discloses an example of a hydraulic braking device for an elevator traction machine. In this hydraulic braking device, an accumulator and a pump are provided in the hydraulic unit supplying hydraulic pressure. The accumulator stores oil at a pressure within a specified range. The pump starts when the hydraulic pressure in the accumulator falls below the lower limit of a specified range and supplies working oil to bring the hydraulic pressure in the accumulator within the specified range. The hydraulic braking device counts the number of pump starts and the number of times the hydraulic braking device is opened and closed. In the hydraulic braking device, if the number of pump starts exceeds a predetermined value relative to the number of times the hydraulic braking device is opened and closed, an abnormal decrease in hydraulic pressure is detected.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-193803 Summary of the Invention

[0006] In hydraulic braking devices, gas can sometimes accumulate in the flow path of the working oil due to gas permeation from the accumulator. This can cause the hydraulic braking device to operate slowly. In the hydraulic braking device of Patent Document 1, the accumulation of gas cannot be detected. Therefore, periodic bleed-out operations are required, which takes time during maintenance and inspections.

[0007] This invention was made to solve such a problem. This invention provides a hydraulic braking device for elevator traction machines that can more easily eliminate gas accumulation.

[0008] The hydraulic braking device for an elevator traction machine of the present invention comprises: an oil tank storing working oil; a pump delivering working oil from the oil tank; a braking unit that releases a braked body disposed on the traction machine of the elevator by pressurizing the working oil and brakes the braked body by depressurizing the working oil; a first switcher disposed in an open / closed circuit including a pressurizing path and a depressurizing path, selectively switching the pressurizing path and the depressurizing path, wherein the pressurizing path is a path from the oil tank via the pump to the braking unit, and the depressurizing path is a path from the braking unit to the oil tank; and a second switcher that selectively switches an exhaust circuit and the open / closed circuit, wherein the exhaust circuit extends from the oil tank via the pump and the braking unit in a state of braking the braked body through the pressurizing path and the depressurizing path to the oil tank.

[0009] Invention Effects

[0010] If it is the hydraulic braking device for the elevator traction machine of the present invention, it is easier to eliminate the accumulation of gas. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the elevator according to implementation method 1.

[0012] Figure 2 This is a structural diagram of the hydraulic braking device according to Embodiment 1.

[0013] Figure 3 This is a diagram showing the hydraulic circuit of the hydraulic unit in Embodiment 1.

[0014] Figure 4 This is a diagram showing the hydraulic circuit of the hydraulic unit in Embodiment 1.

[0015] Figure 5 This is a diagram showing the hydraulic circuit of the hydraulic unit in Embodiment 1.

[0016] Figure 6 This is a flowchart illustrating an example of the operation of the hydraulic braking device according to Embodiment 1.

[0017] Figure 7 This is a hardware structure diagram of the main parts of the control device in Implementation Method 1.

[0018] Label Explanation

[0019] 1: Elevator; 2: Shaft; 3: Traction machine; 4: Main rope; 5: Car; 6: Counterweight; 7: Control panel; 8: Traction machine motor; 9: Drive sheave; 10: Hydraulic braking device; 11: Brake disc; 12: Hydraulic unit; 13: Brake caliper; 14: Oil tank; 15: Pump; 16: First solenoid valve; 17: Second solenoid valve; 18: Variable throttle valve; 19: Measuring device; 20: Control device; 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h: Valve ports; 22: High-pressure pipeline; 23: Accumulator; 100a: Processor; 100b: Memory; 200: Dedicated hardware. Detailed Implementation

[0020] The embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the drawings, identical or equivalent parts are labeled with the same reference numerals, and repeated descriptions are simplified or omitted as appropriate. Furthermore, the present invention is not limited to the following embodiments; any modifications to the constituent elements of the embodiments or any omissions of constituent elements of the embodiments are possible without departing from the spirit of the invention.

[0021] Implementation Method 1

[0022] Figure 1 This is a structural diagram of elevator 1 according to implementation method 1.

[0023] Elevator 1 is used, for example, in buildings with multiple floors. Within the building, there is a shaft 2 for elevator 1. The shaft 2 is a relatively long space spanning multiple floors in the vertical direction. Elevator 1 includes a traction machine 3, main ropes 4, a car 5, a counterweight 6, and a control panel 7.

[0024] The traction machine 3 is disposed, for example, at the upper or lower part of the shaft 2. The traction machine 3 includes: a traction machine motor 8 that generates driving force; and a drive sheave 9 that rotates by means of the driving force generated by the traction machine motor 8. A hydraulic braking device 10 is used in the traction machine 3. The hydraulic braking device 10 can be an internal device that forms part of the traction machine 3, or it can be an external device applied to the traction machine 3. The hydraulic braking device 10 is a device for braking the rotation of the drive sheave 9.

[0025] The main rope 4 is wound around the drive sheave 9. The main rope 4 supports the load of the car 5 on one side of the drive sheave 9. The main rope 4 supports the load of the counterweight 6 on the other side of the drive sheave 9. The main rope 4 is moved by being pulled on either side of the drive sheave 9 by means of the driving force generated by the traction machine motor 8.

[0026] The car 5 is a device that transports users of the elevator 1 between multiple floors by traveling vertically in the hoistway 2. The counterweight 6 is a device that balances the load applied to both sides of the drive sheave 9 between itself and the car 5. The car 5 and the counterweight 6 move in opposite directions vertically in the hoistway 2 in conjunction with the movement of the main rope 4.

[0027] The control panel 7 is a device for controlling the movement of the elevator 1. The control panel 7 is located, for example, at the top or bottom of the hoistway 2. The movements of the elevator 1 controlled by the control panel 7 include, for example, the movement of the car 5 via the traction machine 3 and the braking of the drive sheave 9 of the traction machine 3. The control panel 7 is connected to the traction machine 3 and the car 5 in a manner that allows it to output control signals to the elevator 1 and to obtain information about the status of the elevator 1.

[0028] Figure 2 This is a structural diagram of the hydraulic braking device 10 according to Embodiment 1.

[0029] A brake disc 11 is installed on the drive pulley 9 of the traction machine 3. The drive pulley 9 and the brake disc 11 rotate together with the rotating shaft of the traction machine motor 8.

[0030] The hydraulic braking device 10 includes a hydraulic unit 12 and a brake caliper 13. The hydraulic unit 12 is a unit that supplies hydraulic pressure using working oil. The hydraulic unit 12 supplies hydraulic pressure to the brake caliper 13. For example, when the working oil has been depressurized by the hydraulic unit 12, the brake caliper 13 grips the brake disc 11 by means of the spring force. The brake caliper 13 uses the frictional force generated by gripping the brake disc 11 to brake the brake disc 11 and the drive pulley 9. For example, when the working oil has been pressurized by the hydraulic unit 12, the brake caliper 13 releases its grip on the brake disc 11 by overcoming the spring force. The brake caliper 13 releases the brake disc 11 and the drive pulley 9 by releasing its grip on the brake disc 11. The brake disc 11 is an example of a braked object. The brake caliper 13 is an example of a braking part of the hydraulic braking device 10.

[0031] The control panel 7 controls the release and braking of the drive sheave 9 by outputting command signals to the hydraulic unit 12. The command signals output by the control panel 7 to the hydraulic unit 12 include, for example, a release command. In this example, the release command is a command to cause the brake caliper 13 to release its grip on the brake disc 11. The control panel 7 can also switch the operating mode of the elevator 1. Operating modes include, for example, normal operation and operation stop. Normal operation is, for example, an operating mode in which the car 5 travels in a manner that allows users to be transported between multiple floors. Operation stop is, for example, an operating mode in which the car 5 is stopped during periods of low user traffic, such as late at night or on rest days, in order to save energy consumption.

[0032] Figures 3 to 5 This is a diagram showing the hydraulic circuit of the hydraulic unit 12 in Embodiment 1.

[0033] exist Figure 3 The image shows the hydraulic unit 12 in a state where the brake caliper 13 has released its grip on the brake disc 11.

[0034] The hydraulic unit 12 includes an oil tank 14, a pump 15, a first solenoid valve 16, a second solenoid valve 17, a variable throttle valve 18, a measuring device 19, and a control device 20.

[0035] Oil tank 14 is a device for storing working oil in the hydraulic circuit.

[0036] Pump 15 is a device that delivers working oil from the oil tank 14 to the hydraulic circuit. Pump 15 is driven by an electric motor.

[0037] The first solenoid valve 16 is a device for switching the flow path of the working oil. In this example, the first solenoid valve 16 has four ports: 21a, 21b, 21c, and 21d, and is a four-port valve that switches between a pressurized position and a depressurized position. Figure 3The diagram shows the first solenoid valve 16 in the pressurized position. In the pressurized position, valve ports 21a and 21b are connected, and valve ports 21c and 21d are connected. The first solenoid valve 16 has a check valve that prevents the flow of working oil from valve port 21d to valve port 21c when in the pressurized position. The first solenoid valve 16 is switched to the pressurized position by the energization of the solenoid. When the solenoid is not energized, the first solenoid valve 16 is switched to the depressurized position by the force of a spring.

[0038] The second solenoid valve 17 is a device for switching the path of the working oil flow. In this example, the second solenoid valve 17 has four ports (2 positions): valve port 21e, valve port 21f, valve port 21g, and valve port 21h, which switch between a normal operating position and a venting position. Figure 3 The diagram shows the second solenoid valve 17 in its normal operating position. In this position, valve ports 21e and 21f are connected, and valve ports 21g and 21h are connected. The second solenoid valve 17 has a check valve that, in its normal operating position, prevents the flow of working oil from valve port 21e to valve port 21f. The second solenoid valve 17 is switched to the venting position due to the energization of the solenoid. When the solenoid is not energized, the second solenoid valve 17 is switched to the normal operating position by the force of a spring.

[0039] The hydraulic unit 12 is provided with a flow path for the flow of working oil. In the hydraulic unit 12, part or all of the flow paths connecting the various devices are formed, for example, by high-pressure pipelines. In this example, there is a flow path connecting the oil tank 14 and the inlet of the pump 15, a flow path connecting the outlet of the pump 15 and the valve port 21f of the second solenoid valve 17, a flow path connecting the valve port 21e of the second solenoid valve 17 and the valve port 21b of the first solenoid valve 16, a flow path connecting the valve port 21a of the first solenoid valve 16 and the brake caliper 13, a flow path connecting the brake caliper 13 and the valve port 21d of the first solenoid valve 16, a flow path connecting the valve port 21c of the first solenoid valve 16 and the valve port 21h of the second solenoid valve 17, and a flow path connecting the valve port 21g of the second solenoid valve 17 and the oil tank 14.

[0040] In the hydraulic unit 12, the flow path from the outlet of pump 15 to brake caliper 13 is connected to high-pressure line 22. High-pressure line 22 forms a flow path for the flow of working oil. In this example, high-pressure line 22 is connected to the flow path that connects the valve port 21e of the second solenoid valve 17 and the valve port 21b of the first solenoid valve 16. In this example, the side of high-pressure line 22 connected to this flow path is called the upstream side, and the opposite side is called the downstream side.

[0041] A variable throttle valve 18 is disposed in the high-pressure line 22. A measuring device 19 is disposed in the high-pressure line 22 downstream of the variable throttle valve 18. The measuring device 19 is a device for measuring the pressure of the working oil. The measuring device 19 includes, for example, a pressure sensor.

[0042] The control device 20 is a device for controlling the operation of the hydraulic unit 12. The control device 20 controls, for example, the switching of solenoid excitation and de-excitation, and the starting and stopping of the pump 15. The control device 20 excites the solenoid, for example, by outputting an excitation signal to it. The control device 20 outputs excitation signals, for example, to the solenoids of the first solenoid valve 16 and the second solenoid valve 17. The control device 20 obtains the measured value of the working oil pressure measured by the measuring device 19. The control device 20 receives control signals such as release commands from the control panel 7. The control device 20 outputs excitation signals, for example, based on the measured value from the measuring device 19 and the control signals from the control panel 7.

[0043] The hydraulic unit 12 includes an accumulator 23. The accumulator 23 is, for example, installed in the high-pressure line 22. The accumulator 23 is, for example, a gas accumulator such as a bladder type, piston type, or diaphragm type. The hydraulic unit 12 may also include other accumulators. The hydraulic unit 12 may also include multiple accumulators. The hydraulic unit 12 may also include accumulators installed in other flow paths of the high-pressure line 22.

[0044] Next, use Figure 3 An example of the operation of the hydraulic braking device 10 during release will be explained.

[0045] During normal operation of elevator 1, the second solenoid valve 17 is in the normal operating position. When the control panel 7 moves the car 5 during normal operation, it causes the hydraulic brake device 10 to release the drive sheave 9. At this time, the control panel 7 outputs a release command to the control device 20 of the hydraulic unit 12. Upon receiving the release command, the control device 20 outputs a control signal indicating start to the pump 15 and outputs an excitation signal to the solenoid of the first solenoid valve 16. The solenoid of the first solenoid valve 16 is energized, thereby switching the first solenoid valve 16 to the pressurized position.

[0046] Hydraulic pressure is supplied by the activated pump 15, which causes the working oil to flow in the following sequence: oil tank 14, pump 15, valve ports 21f and 21e of the second solenoid valve 17, valve ports 21b and 21a of the first solenoid valve 16, and brake caliper 13. This is an example of a pressurized path where the working oil flows from the oil tank 14 through the pump 15 to the brake caliper 13. A check valve that prevents the flow of working oil from valve port 21d to valve port 21c of the first solenoid valve 16 is used to prevent the working oil from being discharged from the brake caliper 13. Therefore, the working oil is pressurized in the pressurized path including the brake caliper 13. Furthermore, since the upstream side of the high-pressure line 22 is connected to the pressurized path, the working oil is pressurized in the high-pressure line 22. At this time, the accumulator 23 installed in the high-pressure line 22 is pressurized.

[0047] The brake caliper 13 uses the pressure of the working oil supplied from the oil tank 14 via the pressurization path to overcome the spring force and release the grip of the brake disc 11.

[0048] Next, use Figure 4 An example of the operation of the hydraulic braking device 10 during braking will be explained.

[0049] exist Figure 4 The hydraulic unit 12 is shown in the state where the brake caliper 13 grips the brake disc 11.

[0050] During normal operation of elevator 1, the second solenoid valve 17 is in the normal operating position. When the control panel 7 stops the car 5 during normal operation, it causes the hydraulic braking device 10 to brake the drive sheave 9. 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 can also issue a braking command by stopping the output of a release command to the hydraulic unit 12. Upon receiving the braking command, the control device 20 outputs a stop control signal to the pump 15 to stop the output of the excitation signal to the solenoid of the first solenoid valve 16. Since the excitation of the solenoid of the first solenoid valve 16 stops, the first solenoid valve 16 is switched to the depressurization position by means of the spring force. Figure 4 The first solenoid valve 16 is shown in the depressurization position.

[0051] In the depressurized position of the first solenoid valve 16, valve ports 21a and 21b are connected, and valve ports 21c and 21d are connected. The first solenoid valve 16 has a check valve that prevents the flow of working oil from valve port 21a to valve port 21b when in the depressurized position.

[0052] The working oil is discharged from the brake caliper 13 due to the pressure accumulated in the working oil. At this time, a one-way valve that prevents the working oil from flowing from port 21e to port 21f of the second solenoid valve 17 prevents backflow of the working oil to the pump 15. The working oil is discharged to the oil tank 14 in the order of flow through the brake caliper 13, ports 21d and 21c of the first solenoid valve 16, and ports 21h and 21g of the second solenoid valve 17. This is an example of a depressurization path from the brake caliper 13 to the oil tank 14. Thus, the first solenoid valve 16 selectively switches between the pressurization path and the depressurization path as the path for the working oil flow. The first solenoid valve 16 is an example of a first switcher.

[0053] The brake caliper 13 discharges working oil through the depressurization path, thereby gripping the brake disc 11 by means of the spring force.

[0054] Here, when the hydraulic braking device 10 is released, the working oil is supplied from the oil tank 14 to the brake caliper 13 through the pressurization path, and when the hydraulic braking device 10 is braked, it is discharged from the brake caliper 13 to the oil tank 14 through the depressurization path. Thus, the pressurization path and the depressurization path are included as part of the hydraulic circuit. The hydraulic circuit including the pressurization path and the depressurization path is an example of an open-closed circuit.

[0055] Furthermore, the working oil in the high-pressure line 22 is pressurized until the hydraulic braking device 10 brakes the drive sheave 9. When the hydraulic braking device 10 brakes the drive sheave 9, the working oil is prevented from being discharged from the high-pressure line 22 by using a check valve that prevents the flow of working oil from port 21b to port 21a of the first solenoid valve 16 and a check valve that prevents the flow of working oil from port 21e to port 21f of the second solenoid valve 17. Therefore, the working oil in the high-pressure line 22 remains in a pressurized state. In addition, the accumulator 23 provided in the high-pressure line 22 remains in a pressurized state. The working oil in the high-pressure line 22 and the accumulator 23 can also be supplied to the brake caliper 13 with the pressurized hydraulic pressure when the hydraulic braking device 10 releases the drive sheave 9 again.

[0056] However, for example, gas permeation may sometimes occur in the accumulator 23 installed in the high-pressure pipeline 22. In this case, gas may accumulate in the working oil due to gas permeation from the accumulator 23. Because of the gas accumulation in the working oil, the operation of the hydraulic braking device 10 may sometimes become slow.

[0057] Therefore, the control device 20 monitors the accumulation of gas in the working oil by monitoring the measured value of the working oil pressure measured by the measuring device 19. The control device 20 measures the hydraulic application time when the hydraulic brake device 10 releases the drive sheave 9. Here, the hydraulic application time represents the time from the output of the release command until the working oil pressure reaches a preset pressure threshold. The control device 20 begins measuring the hydraulic application time when it receives the release command from the control panel 7. The control device 20 monitors the measured value of the working oil pressure measured by the measuring device 19. The control device 20 ends the hydraulic application time measurement when the measured value of the working oil pressure reaches the pressure threshold. The control device 20 compares the measured length of the hydraulic application time with the preset time threshold. When the length of the hydraulic application time exceeds the time threshold, the control device 20 determines that the accumulation of gas in the working oil has progressed to the point where venting is required. At this time, the control device 20 activates the venting implementation flag. In this example, after activating the venting implementation flag, the control device 20 does not immediately perform venting, but allows normal operation to continue. For example, when the control panel 7 switches the operation mode to operation stop based on a time period, the control device 20 determines whether the exhaust implementation flag is valid. If the exhaust implementation flag is valid, the control device 20 performs exhaust processing. After performing exhaust processing, the control device 20 deactivates the exhaust implementation flag.

[0058] Next, use Figure 5 An example of the operation of the hydraulic braking device 10 during exhaust treatment will be explained.

[0059] exist Figure 5 The hydraulic unit 12 during exhaust treatment is shown in the image.

[0060] The venting process is performed when the car 5 stops, i.e., when the hydraulic brake device 10 brakes the drive pulley 9. At this time, the first solenoid valve 16 is in the depressurization position. During the venting process, the control device 20 outputs a control signal indicating start to the pump 15 and an excitation signal to the solenoid of the second solenoid valve 17. Due to the excitation of the solenoid of the second solenoid valve 17, the second solenoid valve 17 is switched to the venting position. Figure 5 The image shows the second solenoid valve 17 in the exhaust position.

[0061] In the exhaust position of the second solenoid valve 17, valve port 21e is connected to valve port 21g, and valve port 21f is connected to valve port 21h.

[0062] The pump 15, when activated, causes the working oil to flow to the brake caliper 13 in the following sequence: oil tank 14, pump 15, valve ports 21f and 21h of the second solenoid valve 17, and valve ports 21c and 21d of the first solenoid valve 16. The working oil then flows from the brake caliper 13 to the oil tank 14 in the following sequence: valve ports 21a and 21b of the first solenoid valve 16, and valve ports 21e and 21g of the second solenoid valve 17. This is an example of a venting circuit where the working oil flows from the oil tank 14 through the pump 15 and the brake caliper 13 back to the oil tank 14. The venting circuit is a hydraulic circuit with both a pressurization path and a depressurization path. The direction in which the working oil flows through the brake caliper 13 in the venting circuit is opposite to the direction in which the working oil flows through the brake caliper 13 in the opening / closing circuit. Thus, the second solenoid valve 17 selectively switches between the normal operating circuit and the venting circuit as the hydraulic circuit supplying the working oil. The second solenoid valve 17 is an example of the second switcher.

[0063] During the venting process, the control device 20 starts the pump 15, causing the working oil to circulate in the venting circuit. The flow of the working oil circulating in the venting circuit from the oil tank 14 until its return to the oil tank 14 is not obstructed by a check valve or similar device. As a result, the working oil flows through the brake caliper 13 in the opposite direction to normal operation and is discharged to the oil tank 14, thus venting any gas accumulated in the working oil in the hydraulic circuit. In this way, by switching the hydraulic circuit using the second solenoid valve 17, the accumulation of gas in the working oil can be easily eliminated.

[0064] When the exhaust treatment stop condition is met, the control device 20 outputs a stop control signal to the pump 15 and stops outputting the energizing signal to the solenoid of the second solenoid valve 17. Since the energizing of the solenoid of the second solenoid valve 17 stops, the second solenoid valve 17 is switched to its normal operating position by means of the spring force. The exhaust treatment stop condition is, for example, a predetermined time elapsed since the energizing of the solenoid of the second solenoid valve 17. Alternatively, the exhaust treatment stop condition may also be based on the flow rate of the working oil delivered by the pump 15 or other measured values.

[0065] Furthermore, the control device 20 can also stop the pump 15 after the second solenoid valve 17 is switched to the normal operating position. After the second solenoid valve 17 is switched to the normal operating position, the discharge of working oil from the high-pressure line 22 is prevented by a check valve that prevents the flow of working oil from the valve port 21b to the valve port 21a of the first solenoid valve 16, and a check valve that prevents the flow of working oil from the valve port 21e to the valve port 21f of the second solenoid valve 17. On the other hand, the check valve of the second solenoid valve 17 does not obstruct the inflow of working oil into the high-pressure line 22. Therefore, the working oil in the high-pressure line 22 is pressurized. In addition, the accumulator 23 provided in the high-pressure line 22 is pressurized. The control device 20 stops the pump 15, for example, after a preset time has elapsed since the second solenoid valve 17 was switched to the normal operating position. Alternatively, the control device 20 may, for example, stop the pump 15 when the pressure of the working oil measured by the measuring device 19 reaches a preset pressure after the second solenoid valve 17 is switched to the normal operating position.

[0066] Next, use Figure 6 An example of the operation of the hydraulic braking device 10 will be explained.

[0067] Figure 6 This is a flowchart illustrating an example of the operation of the hydraulic braking device 10 according to Embodiment 1.

[0068] For example, in Figure 6 At the start of the process, solenoid valve 16 is in the pressurized position. Solenoid valve 17 is in the normal operating position. The venting activation indicator is invalid.

[0069] In step S01, the control device 20 determines whether the operating mode of the control panel 7 is set to stop operation. If the determination result is "no", the processing of the hydraulic braking device 10 proceeds to step S02. On the other hand, if the determination result is "yes", the processing of the hydraulic braking device 10 proceeds to step S10.

[0070] In step S02, the control device 20 determines whether a release command has been received from the control panel 7. If the determination result is "no", the processing of the hydraulic braking device 10 proceeds to step S01. On the other hand, if the determination result is "yes", the processing of the hydraulic braking device 10 proceeds to step S03.

[0071] In step S03, the control device 20 outputs a control signal indicating start to the pump 15, and outputs an excitation signal to the solenoid of the first solenoid valve 16. Then, the processing of the hydraulic braking device 10 proceeds to step S04.

[0072] In step S04, the control device 20 begins measuring the hydraulic application time. Then, the processing of the hydraulic braking device 10 proceeds to step S05.

[0073] In step S05, the control device 20 determines whether the pressure of the working oil measured by the measuring device 19 has reached the pressure threshold. If the determination result is "no", the processing of the hydraulic braking device 10 proceeds to step S05, and the measurement of the hydraulic application time continues. On the other hand, if the determination result is "yes", the measurement of the hydraulic application time ends, and the control device 20 sets the time from the start to the end of the measurement as the length of the hydraulic application time. Then, the processing of the hydraulic braking device 10 proceeds to step S06.

[0074] In step S06, the control device 20 determines whether the hydraulic application time exceeds a time threshold. If the determination result is "yes", the processing of the hydraulic braking device 10 proceeds to step S07. On the other hand, if the determination result is "no", the processing of the hydraulic braking device 10 proceeds to step S08.

[0075] In step S07, the control device 20 activates the exhaust implementation flag. Then, the processing of the hydraulic braking device 10 proceeds to step S08.

[0076] In step S08, the control device 20 determines whether a braking command has been received from the control panel 7. The control device 20 may also determine that a braking command has been received from the control panel 7 when the release command from the control panel 7 stops. If the control device 20 determines that a braking command has not been received, the processing of the hydraulic braking device 10 proceeds to step S08 again. On the other hand, if the determination result is "yes," the processing of the hydraulic braking device 10 proceeds to step S09.

[0077] 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 first solenoid valve 16. Then, the processing of the hydraulic braking device 10 proceeds to step S01.

[0078] In step S10, the control device 20 determines whether the exhaust implementation flag is valid. If the determination result is "no", the processing of the hydraulic braking device 10 proceeds to step S01. On the other hand, if the determination result is "yes", the processing of the hydraulic braking device 10 proceeds to step S11.

[0079] In step S11, the control device 20 outputs a control signal indicating start to the pump 15, and outputs an excitation signal to the solenoid of the second solenoid valve 17. Then, the processing of the hydraulic braking device 10 proceeds to step S12.

[0080] In step S12, the control device 20 determines whether the venting process stop condition is met. For example, the control device 20 may determine that the venting process stop condition is met when a preset time has elapsed since the second solenoid valve 17 was switched to the venting position. If the stop condition is not met, the hydraulic braking device 10 process proceeds to step S12 again. On the other hand, if the stop condition is met, the hydraulic braking device 10 process proceeds to step S13.

[0081] 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 second solenoid valve 17. Then, the processing of the hydraulic braking device 10 proceeds to step S14.

[0082] In step S14, the control device 20 disables the exhaust implementation flag. Then, the processing of the hydraulic braking device 10 proceeds to step S01.

[0083] As described above, the hydraulic braking device 10 of Embodiment 1 includes an oil tank 14, a pump 15, a brake caliper 13, a first solenoid valve 16, and a second solenoid valve 17. The oil tank 14 stores working oil. The pump 15 delivers working oil from the oil tank 14. A brake disc 11 is provided in the traction machine 3 of the elevator 1. The brake caliper 13 releases the brake disc 11 by pressurizing the working oil and brakes the brake disc 11 by depressurizing the working oil. The first solenoid valve 16 is provided in an open / closed circuit that includes a pressurization path and a depressurization path. The pressurization path is the path from the oil tank 14 to the brake caliper 13 via the pump 15. The depressurization path is the path from the brake caliper 13 to the oil tank 14. The first solenoid valve 16 selectively switches between the pressurization path and the depressurization path. The second solenoid valve 17 selectively switches between the venting circuit and the open / closed circuit. The exhaust circuit is a circuit that extends from the oil tank 14 to the oil tank 14 via the pump 15 and the brake caliper 13 which is braking the brake disc 11 through a pressurization path and a depressurization path.

[0084] With this structure, the exhaust circuit and the on / off circuit can be easily switched using the second solenoid valve 17. The flow of the working oil circulating in the exhaust circuit from the oil tank 14 until its return to the oil tank 14 is not obstructed by valves or the like. In the exhaust circuit, the pump 15 causes the working oil to return from the oil tank 14 via the brake caliper 13 through a pressurization path and a depressurization path. Therefore, the pressurization path, the depressurization path, and the gas accumulated in the working oil in the brake caliper 13 are easily discharged to the oil tank 14. Furthermore, the second solenoid valve 17 switches between the on / off circuit and the exhaust circuit due to the excitation of the solenoid. Thus, the switching between the on / off circuit and the exhaust circuit can be implemented according to control signals from the control panel 7, etc.

[0085] Furthermore, the hydraulic braking device 10 includes a measuring device 19 and a control device 20. The measuring device 19 measures the pressure of the working oil. The control device 20 switches the second solenoid valve 17 between the exhaust circuit and the on / off circuit based on the pressure measured by the measuring device 19.

[0086] Furthermore, the control device 20 measures the time from the output of the command to release the brake disc 11 until the pressure measured by the measuring device 19 reaches a preset pressure threshold. When the measured time exceeds the preset time threshold, the control device 20 causes the second solenoid valve 17 to switch between the exhaust circuit and the on / off circuit.

[0087] With this structure, the hydraulic brake device 10 can detect when gas accumulates in the working oil to the point that its operation becomes slow, and at this time, venting can be performed. Thus, venting in the working oil is automated, eliminating the need for periodic venting operations by maintenance personnel. This improves the maintainability of the hydraulic brake device 10. Furthermore, since venting is not performed as a maintenance task, errors in maintenance operations can be suppressed. Moreover, since venting is performed by monitoring the operational delay of the hydraulic brake device 10, delays in the start-up of the elevator 1 are less likely to occur. Additionally, venting can also be performed during normal operation of the elevator 1 when the car 5 is stopped.

[0088] In addition, during the period when the elevator 1 stops operating, the control device 20 causes the second solenoid valve 17 to switch the exhaust circuit and the opening and closing circuit.

[0089] With this structure, exhaust treatment can be performed while suppressing the impact on user convenience, etc.

[0090] Furthermore, 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 and closing circuit.

[0091] With this structure, the gas accumulated in the working oil of the brake caliper 13 can be easily discharged through the braking and release of the hydraulic braking device 10.

[0092] Furthermore, the hydraulic braking device 10 may not be a disc brake with a brake disc 11 held by a brake caliper 13. The hydraulic braking device 10 may also be, for example, a drum brake. Moreover, the switching between the pressurization path and the depressurization path may not be performed by a solenoid valve. The switching between the pressurization path and the depressurization path may also be performed by, for example, a pilot-operated switching valve. The switching between the opening / closing circuit and the exhaust circuit may also not be performed by a solenoid valve. The switching between the opening / closing circuit and the exhaust circuit may also be performed by, for example, a pilot-operated switching valve.

[0093] Next, use Figure 7 An example of the hardware structure of the control device 20 will be explained.

[0094] Figure 7 This is a hardware structure diagram of the main parts of the control device 20 in Embodiment 1.

[0095] The functions of the control device 20 can be implemented by a processing circuit. The processing circuit includes at least one processor 100a and at least one memory 100b. Alternatively, the processing circuit may include processor 100a, memory 100b and at least one dedicated hardware 200, or, as an alternative to processor 100a and memory 100b, the processing circuit may include at least one dedicated hardware 200.

[0096] When the processing circuit includes a processor 100a and a memory 100b, the functions of the control device 20 are implemented by software, firmware, or a combination of software and firmware. At least one of the software and firmware is described as a program. The program is stored in the memory 100b. The processor 100a implements the functions of the control device 20 by reading and executing the program stored in the memory 100b.

[0097] The processor 100a is also called a CPU (Central Processing Unit), processing device, arithmetic device, microprocessor, microcomputer, or DSP. The memory 100b is composed of non-volatile or volatile semiconductor memories such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (Electrically Erasable Programmable Read Only Memory).

[0098] When the processing circuit has dedicated hardware 200, the processing circuit is implemented, for example, by a single circuit, a composite circuit, a programming processor, a parallel programming processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.

[0099] Each function of the control device 20 can be implemented separately by the processing circuit. Alternatively, each function of the control device 20 can also be implemented centrally by the processing circuit. Regarding each function of the control device 20, some can be implemented by dedicated hardware 200, and others by software or firmware. Thus, the processing circuit implements each function of the control device 20 through dedicated hardware 200, software, firmware, or a combination thereof.

[0100] In summary, the structures that can be adopted by the technology of the present invention include the structures shown below as appendices.

[0101] (Postscript 1)

[0102] A hydraulic braking device for an elevator traction machine, wherein the hydraulic braking device for the elevator traction machine comprises:

[0103] The fuel tank stores the working oil;

[0104] A pump that delivers working oil from the oil tank;

[0105] The braking unit releases the braked body of the traction machine installed in the elevator by pressurizing the working oil, and brakes the braked body by depressurizing the working oil.

[0106] A first switcher, configured in an open / closed loop including a pressurization path and a depressurization path, selectively switches between the pressurization path and the depressurization path, wherein the pressurization path is the path from the oil tank via the pump to the brake unit, and the depressurization path is the path from the brake unit to the oil tank; and

[0107] The second switch selectively switches the exhaust circuit and the opening / closing circuit, the exhaust circuit being connected from the oil tank via the pump and the braking unit in a state of braking the braked body, through the pressurization path and the depressurization path.

[0108] (Postscript 2)

[0109] According to the hydraulic braking device for elevator traction machines described in Appendix 1, wherein...

[0110] The second switch is a solenoid valve.

[0111] (Note 3)

[0112] According to Appendix 1 or 2, the hydraulic braking device for the elevator traction machine, wherein...

[0113] The hydraulic braking device for the elevator traction machine includes:

[0114] The measuring device measures the pressure of the working oil; and

[0115] A control device that causes the second switcher to switch the exhaust circuit and the opening / closing circuit based on the pressure measured by the measuring device.

[0116] (Postscript 4)

[0117] According to Appendix 3, the hydraulic braking device for the elevator traction machine, wherein...

[0118] When the time from the output of the command to release the braked body to the pressure measured by the measuring device reaching a preset pressure threshold exceeds a preset time threshold, the control device causes the second switcher to switch the exhaust circuit and the opening / closing circuit.

[0119] (Note 5)

[0120] According to Appendix 3 or 4, the hydraulic braking device for the elevator traction machine, wherein...

[0121] During the period when the elevator operation is stopped, the control device causes the second switcher to switch between the exhaust circuit and the opening and closing circuit.

[0122] (Note 6)

[0123] The hydraulic braking device for an elevator traction machine according to any one of Appendices 1 to 5, wherein...

[0124] The direction in which the working oil flows through the brake unit in the exhaust circuit is opposite to the direction in which the working oil flows through the brake unit in the opening and closing circuit.

Claims

1. A hydraulic braking device for an elevator traction machine, wherein, The hydraulic braking device for the elevator traction machine includes: The fuel tank stores the working oil; A pump that delivers working oil from the oil tank; The braking unit releases the braked body of the traction machine installed in the elevator by pressurizing the working oil, and brakes the braked body by depressurizing the working oil. A first switcher, configured in an open / closed loop including a pressurization path and a depressurization path, selectively switches between the pressurization path and the depressurization path, wherein the pressurization path is the path from the oil tank via the pump to the brake unit, and the depressurization path is the path from the brake unit to the oil tank; and The second switch selectively switches the exhaust circuit and the opening / closing circuit, the exhaust circuit being connected from the oil tank via the pump and the braking unit in a state of braking the braked body, through the pressurization path and the depressurization path.

2. The hydraulic braking device for an elevator traction machine according to claim 1, wherein, The second switch is a solenoid valve.

3. The hydraulic braking device for an elevator traction machine according to claim 1 or 2, wherein, The hydraulic braking device for the elevator traction machine includes: The measuring device measures the pressure of the working oil; and A control device that causes the second switcher to switch the exhaust circuit and the opening / closing circuit based on the pressure measured by the measuring device.

4. The hydraulic braking device for an elevator traction machine according to claim 3, wherein, When the time from the output of the command to release the braked body to the pressure measured by the measuring device reaching a preset pressure threshold exceeds a preset time threshold, the control device causes the second switcher to switch the exhaust circuit and the opening / closing circuit.

5. The hydraulic braking device for an elevator traction machine according to claim 3, wherein, During the period when the elevator operation is stopped, the control device causes the second switcher to switch between the exhaust circuit and the opening and closing circuit.

6. The hydraulic braking device for an elevator traction machine according to claim 4, wherein, During the period when the elevator operation is stopped, the control device causes the second switcher to switch between the exhaust circuit and the opening and closing circuit.

7. The hydraulic braking device for an elevator traction machine according to any one of claims 1 to 2, 4 to 6, wherein, The direction in which the working oil flows through the brake unit in the exhaust circuit is opposite to the direction in which the working oil flows through the brake unit in the opening and closing circuit.

8. The hydraulic braking device for an elevator traction machine according to claim 3, wherein, The direction in which the working oil flows through the brake unit in the exhaust circuit is opposite to the direction in which the working oil flows through the brake unit in the opening and closing circuit.

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