AU2016428671B2 - Safe-braking control system, mine hoist and safe-braking control method - Google Patents

Safe-braking control system, mine hoist and safe-braking control method Download PDF

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Publication number
AU2016428671B2
AU2016428671B2 AU2016428671A AU2016428671A AU2016428671B2 AU 2016428671 B2 AU2016428671 B2 AU 2016428671B2 AU 2016428671 A AU2016428671 A AU 2016428671A AU 2016428671 A AU2016428671 A AU 2016428671A AU 2016428671 B2 AU2016428671 B2 AU 2016428671B2
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Prior art keywords
braking
disc brake
brake
circuits
disc
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AU2016428671A1 (en
Inventor
Guijun GAO
Ziming KOU
Hao Qin
Juan Wu
Jianwei YANG
Jing Zhang
Peng Zhang
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Taiyuan University of Technology
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Taiyuan University of Technology
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Priority to PCT/CN2016/104638 priority Critical patent/WO2018082022A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24Operating devices
    • B66D5/26Operating devices pneumatic or hydraulic
    • B66D5/28Operating devices pneumatic or hydraulic specially adapted for winding gear, e.g. in mining hoists

Abstract

Disclosed are a safe-braking control system, a mine hoist and a safe-braking control method. The safe-braking control system is used for safe-braking control of an engineering hoisting equipment, and comprises: a disk braking subsystem (100), which is used for safely braking a brake disc (3) of the engineering hoisting equipment by means of a brake shoe of a brake driven by hydraulic fluid; an electrically-controlled braking subsystem (200), which is used to brake a motor (5) of the engineering hoisting equipment when the disk braking subsystem (100) fails to brake. Because two sets of brake subsystems, namely the disk braking subsystem and the electrically-controlled braking subsystem, are provided for the engineering hoisting equipment, the electrically-controlled brake may be started in a timely manner in an abnormal situation of a mechanical brake control failing so as to ensure safe-braking function of the engineering hoisting equipment, thereby avoiding occurrence of a serious accident and improving reliability and safety of safe-braking for the engineering hoisting equipment in abnormal operating conditions.

Description

The present invention relates to safety braking control technology, and especially relates to a safety braking control system and method applicable to an engineering hoisting device, and a mine hoist comprising the safety braking control system.
BACKGROUND ART
A mine hoist is a machine working down the mine and on the ground, which can drive a container (a cage or a skip) to be lifted and lowered in the shaft by a wire rope to complete the task of material and personnel transportation. For mine hoists, safety braking is an important requirement for ensuring the safety in material and personnel transportation.
Currently, common safety braking manners of mine hoists include one-stage braking, two-stage braking and constant deceleration braking. The braking torque of one-stage braking and two-stage braking is determined according to the full-load downloading working condition, and the numerical value of the braking torque no longer changes after adjustment. For a mine with a small change in hoisting load, one-stage braking and two-stage braking can basically meet the requirements. However, for a mine with a great change in hoisting load and a high hoisting speed, two-stage braking causes too much change in the operation deceleration of the hoist, which is easy to cause sliding of the wire rope and may even lead to rope breaking, thereby endangering the device and personal safety. By contrast, constant deceleration braking can be unaffected by the load, and the deceleration during braking is within an expected value range. Sliding and breaking of the wire rope can be avoided by controlling the deceleration for smooth braking. Thus, constant deceleration braking system is a preferred safety braking manner for dealing with emergencies at coal mines.
In the existing constant deceleration braking system, the brake control hardware device is easy to fail. For example, when the hydraulic circuit of the disc brake is blocked, it may cause accidental braking or failure to brake at a critical moment, thus causing a serious accident.
Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims.
CONTENTS OF THE INVENTION
Aspects of the present invention provide a safety braking control system, a mine hoist and a safety braking control method, which can improve the reliability and safety when an engineering hoisting device performs safety braking under abnormal working conditions.
Throughout this specification the word comprise, or variations such as comprises or comprising, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
In one aspect, the present invention provides a safety braking control system for controlling a safety braking of the engineering hoisting device, comprising:
a disc brake braking subsystem, for safely braking a brake disc of the engineering hoisting device by driving a brake shoe of a brake with a hydraulic fluid; and an electrically controlled braking subsystem, for braking a motor of the engineering hoisting device in the case of braking failure of the disc brake braking subsystem.
Further, the disc brake braking subsystem may comprise:
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a disc brake group having at least one set of disc brake pairs, for safely braking the brake disc of the engineering hoisting device under the drive of a hydraulic fluid;
at least one set of main braking circuits, respectively connected with each of the disc brake pairs in the disc brake group, for providing the corresponding disc brake pair in the disc brake group with a hydraulic fluid to control the braking torque of the disc brake pair when the engineering hoisting device requires emergency braking; and at least one set of standby braking circuits, respectively connected with each of the disc brake pairs in the disc brake group, for providing the corresponding disc brake pair with a hydraulic fluid to control the braking torque of the disc brake pair instead of the failed main braking circuits by switching the hydraulic circuits, when at least part of the main braking circuits fail.
Further, the disc brake braking subsystem may further comprise:
an electro-hydraulic proportional reversing valve, disposed in the main braking circuits and the standby braking circuits, for controlling a flow and a communication relationship of the disc brake group respectively with the main braking circuits and the standby braking circuits; and a detection feedback member, for detecting a sensing signal configured to characterize the operating state of the engineering hoisting device, and for feeding back the signal to the electro-hydraulic proportional reversing valve and the electrically controlled braking subsystem.
Further, the detection feedback member may comprise:
a sensing unit, for detecting the sensing signal and sending the sensing signal to a constant decompression control cabinet; and the constant decompression control cabinet, for providing a control signal to the electro-hydraulic proportional reversing valve according to the received sensing signal, so as to realize constant deceleration braking control for the brake disc of the engineering hoisting device in a □s closed-loop control manner.
Further, the sensing unit may comprise at least one of the following CL
O sensors:
QC a pressure sensor, disposed in each of the main braking circuits and each of the standby braking circuits, for detecting a pressure of a hydraulic pipeline where the pressure sensor is located and sending a sensing signal of the pressure to the constant decompression control cabinet;
a speed sensor, disposed on a reel or the brake disc of the engineering hoisting device, for detecting a rotation speed of the reel or the brake disc and sending a sensing signal of the rotation speed to the constant decompression control cabinet; and a clearance/stroke sensor, disposed in each disc brake pair, for detecting a clearance/stroke sensing signal of the disc brake pairs and sending the clearance/stroke sensing signal to the constant decompression control cabinet.
Further, the electrically controlled braking subsystem may be configured to determine, according to the sensing signals fed back by the detection feedback member, whether the main braking circuits in the disc brake braking subsystem all fail, and brake the motor of the engineering hoisting device if the main braking circuits all fail.
Further, the main braking circuits and the standby braking circuits may be separately powered by independent accumulators.
Further, a plurality of the electro-hydraulic proportional reversing valves may be provided, and may be respectively disposed in each of the main braking circuits and the standby braking circuits, for realizing switching of active and standby braking circuits by controlling the communication relationship between each of the main braking circuits and the standby braking circuits and realizing constant deceleration braking control for the brake disc of the engineering hoisting device by controlling the flow of the braking circuits in communication.
Further, the main braking circuits and the standby braking circuits may further comprise an electromagnetic on-off valve group controlling the communication relationship of the hydraulic fluid, for controlling the on/off state of the main braking circuits or the standby braking circuits and realizing pressure relief control of the disc brake group.
Further, the electromagnetic on-off valve group, the electro-hydraulic proportional reversing valve, and the detection feedback member may be powered by a standby uninterruptible power supply system under emergency safety braking conditions.
In one aspect, the present invention further provides a mine hoist comprising the afore-mentioned safety braking control system, the mine hoist being the engineering hoisting device.
In one aspect, the present invention further provides a safety braking control method of the afore-mentioned safety braking control system, comprising:
in case of emergency safety braking of the engineering hoisting device, safety braking is carried out on the brake disc of the engineering hoisting device by the disc brake braking subsystem through driving the brake shoe of the brake with a hydraulic fluid; and when the disc brake braking subsystem fails to brake, the motor of the engineering hoisting device is braked by the electrically controlled braking subsystem.
Further, the disc brake braking subsystem may comprise: a disc brake group with at least one set of disc brake pairs, at least one set of main braking circuits and at least one set of standby braking circuits respectively connected with each disc brake pair in the disc brake group; and the step that safety braking is carried out on the brake disc of the engineering hoisting device by the disc brake braking subsystem through driving the brake shoe of the brake with a hydraulic fluid comprises:
the at least one set of main braking circuits provides the corresponding disc brake pair in the disc brake group with a hydraulic fluid to control the braking torque of the disc brake pair, such that the corresponding disc brake pair safely brakes the brake disc of the engineering hoisting device under the drive of the hydraulic fluid; and when at least part of the main braking circuits fail, the failed main braking circuits are replaced by the at least one set of standby braking circuits through switching the hydraulic circuits, so as to provide the corresponding disc brake pair with a hydraulic fluid to control the braking torque of the disc brake pair for the corresponding disc brake pair.
Further, the operation may further comprise: braking is carried out on the motor of the engineering hoisting device by the electrically controlled braking subsystem, when the main braking circuits in the disc brake braking subsystem all fail.
Further, the disc brake braking subsystem may further comprise: a detection feedback member, a plurality of electro-hydraulic proportional reversing valves respectively disposed in each of the main braking circuits and the standby braking circuits.
The safety braking control method may further comprise:
the communication relationship between each of the main braking circuits and the standby braking circuits is controlled by the electro-hydraulic proportional reversing valves according to the sensing signal detected by the detection feedback member which characterizes the operating state of the engineering hoisting device, so as to realize the switching of active and standby braking circuits; and the flow of the braking circuit in communication is also controlled by the electro-hydraulic proportional reversing valves, so as to realize the constant deceleration braking control for the brake disc of the engineering hoisting device.
In accordance with aspects of the invention as described above, two sets of braking subsystems, namely a disc brake braking subsystem and an electrically controlled braking subsystem, are provided for the engineering hoisting device, which can make it possible to timely active the electrically controlled braking in the abnormal case of mechanical brake control failure, so as to ensure the safety braking effect of the engineering hoisting device and to avoid serious accidents. In addition, the disc brake braking subsystem and the electrically controlled braking subsystem can be configured to achieve independent emergency protection, protection between each other and electromechanical latching, thus improving the reliability and safety during safety braking of the engineering hoisting device under abnormal working conditions.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings illustrated here are for providing further understanding of the present invention and thus constitute part of the present invention. The exemplary embodiments of the present invention and descriptions thereof are for interpreting the present invention, not constituting improper limitations of the present invention. In the drawings:
FIG. 1 is a schematic view of the principle of an embodiment of the safety braking system of the present invention.
FIG. 2 is a schematic view of the principle of another embodiment of the safety braking system of the present invention.
FIG. 3 is a schematic view of the principle of another embodiment of the safety braking system of the present invention.
FIG. 4 is a schematic view of the structure of an embodiment of the safety braking system of the present invention applied to a mine hoist.
FIG. 5 is a schematic view of the principle of an example of hydraulic control of the disc brake braking subsystem in the embodiments of the safety braking system of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Hereinafter, features of the present invention will be further described in detail through drawings and embodiments.
FIG. 1 is a schematic view of the principle of an embodiment of the safety braking system of the present invention. In this embodiment, the safety braking control system is used for controlling a safety braking of an engineering hoisting device. In combination with the schematic view of the structure of an embodiment of the safety braking system of the present invention applied to a mine hoist as shown in FIG. 4, the safety braking control system comprises: a disc brake braking subsystem 100 and an electrically controlled braking subsystem 200. Wherein, the disc brake braking subsystem 100 is for safely braking a brake disc 3 of the engineering hoisting device by driving a brake shoe of a brake with a hydraulic fluid. The electrically controlled braking subsystem 200 is for braking a motor 5 of the engineering hoisting device in the case of braking failure of the disc brake braking subsystem 100.
In this embodiment, two sets of braking subsystems, namely a disc brake braking subsystem and an electrically controlled braking subsystem, are provided for the engineering hoisting device in the present invention, which makes it possible to timely active the electrically controlled braking under the abnormal condition of mechanical brake control failure, so as to ensure the safety braking effect of the engineering hoisting device and to avoid serious accidents. In addition, the disc brake braking subsystem and the electrically controlled braking subsystem can achieve independent emergency protection, protection between each other and electromechanical latching, and thus improve the reliability and safety during safety braking of the engineering hoisting device under abnormal working conditions.
The disc brake braking subsystem 100 performs braking with a disc brake and uses a hydraulic fluid (such as hydraulic oil and the like) to drive the brake shoe of the disc brake, as a reel 1 of the engineering hoisting device rotates synchronously with the brake disc 3, and a great friction is obtained by the brake shoe squeezing the brake disc 3, thus deceleration and stop of the reel 1 are realized. In this embodiment, the disc brake braking subsystem 100 is configured to adopt an electro-hydraulic closed-loop control scheme to realize constant deceleration control under the working conditions of emergency braking.
FIG. 2 is a schematic view of the principle of another embodiment of the safety braking system of the present invention. Compared with the previous embodiment, the disc brake braking system 100 may specifically comprise: a disc brake group 110, at least one set of main braking circuits 120 and at least one set of standby braking circuits 130. Wherein, the disc brake group 110 having at least one set of disc brake pairs 2, is for safely braking the brake disc 3 of the engineering hoisting device under the drive of a hydraulic fluid.
At least one set of main braking circuits 120 are respectively connected with each of the disc brake pairs 2 in the disc brake group 110, and are for providing the corresponding disc brake pair 2 in the disc brake group 110 with a hydraulic fluid to control the braking torque of the disc brake pair 2 when the engineering hoisting device requires emergency braking. At least one set of standby braking circuits 130 are respectively connected with each of the disc brake pairs 2 in the disc brake group 110, and are for replacing the failed main braking circuits 120 by switching the hydraulic circuits to provide the corresponding disc brake pair 2 with a hydraulic fluid to control the braking torque of the disc brake pair 2, when at least part of the main braking circuits 120 fail.
The main braking circuits 120 herein can be used for disc brake braking under normal conditions and emergency braking conditions. When one or more main braking circuits 120 fail, corresponding standby braking circuits 130 can be used instead, thus a function of disc brake braking is still on. Besides, for the disc brake braking subsystem 100, N sets of disc brake pairs 2, main braking circuits 120 and standby braking circuits 130 may be provided. The probability of simultaneous failure of the N sets of disc brake pairs 2 is very small, no matter in normal operation or in parking braking conditions. And even if one or more main braking circuits 120 fail, a standby braking circuit 130 can be conveniently switched to provide a hydraulic fluid to the corresponding disc brake pair 2 instead. This process is very fast and has little impact on the production time of the engineering hoisting device.
An N + 1 electromechanical latching solution is realized by the N sets of disc brake pairs 2 and the corresponding main and standby braking circuits herein together with the motor braking function achieved by the previously mentioned electrically controlled braking subsystem 200 , which efficiently reduces or avoids serious accidents caused by accidental braking or braking failure at a critical moment, thus greatly improving the reliability and safety during safety braking of the engineering hoisting device under abnormal operating conditions.
In FIG. 2, the disc brake braking subsystem 100 may further comprise: an electro-hydraulic proportional reversing valve 140 and a detection feedback member 150. Wherein, the electro-hydraulic proportional reversing valve 140 is disposed in the main braking circuits 120 and the standby braking circuits 130, for controlling a flow and a communication relationship of the disc brake group 110 respectively with the main braking circuits 120 and the standby braking circuits 130. The detection feedback member 150 is for detecting a sensing signal configured to characterize the operating state of the engineering hoisting device, and for feeding back the sensing signal to the electro-hydraulic proportional reversing valve 140 and the electrically controlled braking subsystem 200.
The on-off and the flow of the braking circuit where the electro-hydraulic proportional reversing valve 140 is located can be controlled by the electro-hydraulic proportional reversing valve 140 according to the electrical control signal provided by the detection feedback member 150, thus the constant deceleration braking control of the disc brake being realized. The detection feedback member 150 is configured to detect the sensing signals (such as the rotation speed of the reel, the oil pressure of the braking circuits, the clearance and stroke of the disc brake pairs, and other sensing signals) that characterize the operating state of the engineering hoisting device. In addition to being provided to the electro-hydraulic proportional reversing valve 140, the detected sensing signals are also provided to the electrically controlled braking subsystem 200, so that the motor 5 of the engineering hoisting device is braked timely by the electrically controlled braking subsystem 200 when the disc brake braking subsystem fails.
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Between the disc brake braking strategy and the electrically controlled braking strategy, the disc brake braking is preferably adopted, and the electrically controlled braking is activated only when the disc brake braking completely fails. The electrically controlled braking subsystem 200 is configured to determine, according to the sensing signal fed back by the detection feedback member 150, whether the main braking circuits 120 in the disc brake braking subsystem 100 all fail, and brake the motor 5 of the engineering hoisting device if the main braking circuits all fail.
The hydraulic fluid for the main braking circuits 120 and the standby braking circuits 130 may be provided by a motor-driven pump or an accumulator. Considering that the emergency braking condition may be accompanied by a power failure, it is preferable that the main braking circuits 120 and the standby braking circuits 130 are each powered by a separate accumulator, thereby even if after being de-energized the motor cannot drive the pump to provide hydraulic fluids to the main braking circuits 120 and the standby braking circuits 130, the hydraulic fluid supply for braking can still be completed by the accumulator.
Considering that the main braking circuits 120 and the standby braking circuits 130 may be provided in plurality, a plurality of electro-hydraulic proportional reversing valves 140 may be disposed correspondingly. By providing a separate electro-hydraulic proportional reversing valve 140 respectively in each of the main braking circuits 120 and the standby braking circuits 130, the communication relationship between each of the main braking circuits 120 and the standby braking circuits 130 can be conveniently controlled to realize the switching of the active and standby braking circuits, and the constant deceleration braking control for the brake disc 3 of the engineering hoisting device can be realized by controlling the flow of the braking circuit currently in communication, so as to simplify the structure of the electro-hydraulic proportional reversing valves and the design of control logic.
In order to meet the requirements of normal operation braking and improve the control function of the active and standby braking circuits, an electromagnetic on-off valve group controlling the communication relationship of the hydraulic fluid may be further added to the main braking circuits 120 and the standby braking circuits 130. The electromagnetic on-off valve group controls the on-off state of the main braking circuits 120 or the standby braking circuits 130, and realizes pressure relief control of the disc brake group 110. Correspondingly, in order to avoid the potential power failure accompanied with the emergency safety braking condition, the electromagnetic on-off valve group, the electro-hydraulic proportional reversing valves 140, and the detection feedback member 150 are preferably powered by a standby uninterrupted power supply (UPS) system under emergency safety braking conditions to ensure smooth safety braking by the disc brake braking subsystem.
FIG. 3 is a schematic view of the principle of another embodiment of the safety braking system of the present invention. Compared with the previous embodiment, the detection feedback member 150 in this embodiment specifically comprises: a constant decompression control cabinet 151 and a sensing unit 152. Wherein, The sensing unit 152 is for detecting the sensing signal and sending the obtained sensing signal to the constant decompression control cabinet 151; and the constant decompression control cabinet 151 is for providing a control signal to the electro-hydraulic proportional reversing valve 140 according to the received sensing signal, so as to realize constant deceleration braking control for the brake disc 3 of the engineering hoisting device in a closed-loop control manner.
The sensing unit 152 may comprise one or more of the following sensors, such as a pressure sensor, a speed sensor 7, a clearance/stroke sensor, and the like. Wherein, a pressure sensor may be disposed in each of the main braking circuits 120 and each of the standby braking circuits 130, for detecting a pressure of a hydraulic pipeline where it’s located and sending a sensing signal of the pressure to the constant decompression control cabinet 151. FIG. 4 shows a speed sensor 7 disposed on the reel 1 or the brake disc 3 of the engineering hoisting device, and the speed sensor 7 is for detecting a rotation speed of the reel 1 or the brake disc 3 and sending a sensing signal of the rotation speed to the constant decompression control cabinet 151. A clearance/stroke sensor is provided in each disc brake pair 2, for detecting a clearance/stroke sensing signal of the disc brake pair 2 and sending the clearance/stroke sensing signal to the constant decompression control cabinet 151.
The above-mentioned embodiments of the safety braking control system in the present invention are applicable to various kinds of engineering hoisting devices, and are especially applicable to a mine hoist, which can effectively improve the safety performance of a mine hoist. That is, the present invention also provides a mine hoist comprising the safety braking control system described in the afore-mentioned embodiments, and the mine hoist is an engineering hoisting device described in the embodiments of the safety braking control system.
Based on the afore-mentioned safety braking control system, the present invention also provides a corresponding safety braking control method, comprising: in case of emergency safety braking of the engineering hoisting device, safety braking is carried out on the brake disc 3 of the engineering hoisting device by the disc brake braking subsystem 100 through driving the brake shoe of the brake with a hydraulic fluid; and the motor 5 of the engineering hoisting device is braked by the electrically controlled braking subsystem 200 in the case of braking failure of the disc brake braking subsystem 100.
When the disc brake braking subsystem 100 specifically comprises a disc brake group 110 with at least one set of disc brake pairs 2, at least one set of main braking circuits 120 and at least one set of standby braking circuits 130 respectively connected with each disc brake pair 2 in the disc brake group 110, the step that safety braking is carried out on the brake disc 3 of the engineering hoisting device by the disc brake braking subsystem 100 through driving the brake shoe of the brake with a hydraulic fluid (namely the disc brake braking subsystem 100 safely brakes the brake disc 3 of the engineering hoisting device by driving the brake shoe of the brake with a hydraulic fluid) specifically comprises:
the at least one set of main braking circuits 120 provides the corresponding disc brake pair 2 in the disc brake group 110 with a hydraulic fluid to control the braking torque of the disc brake pair 2, such that the corresponding disc brake pair 2 safely brakes the brake disc 3 of the engineering hoisting device under the drive of the hydraulic fluid; and when at least part of the main braking circuits 120 fail, the failed main braking circuits 120 are replaced by the at least one set of standby braking circuits 130 through switching the hydraulic circuits, so as to provide the corresponding disc brake pair 2 with a hydraulic fluid to control the braking torque of the disc brake pair 2.
When the main braking circuits 120 in the disc brake braking subsystem 100 all fail, braking is carried out on the motor 5 of the engineering hoisting device by the electrically controlled braking subsystem 200.
In another embodiment of the control method, the disc brake braking subsystem 100 may further comprise: a detection feedback member 150, a plurality of electro-hydraulic proportional reversing valves 140 disposed respectively in each of the main braking circuits 120 and the standby braking circuits 130; correspondingly, the safety braking control method may further comprise:
the communication relationship between each of the main braking circuits 120 and the standby braking circuits 130 is controlled by the electro-hydraulic proportional reversing valves according to the sensing signal detected by the detection feedback member 150 which characterizes the operating state of the engineering hoisting device, so as to realize the switching of active and standby braking circuits; and, the flow of the braking circuit currently in communication is also controlled by the electro-hydraulic proportional reversing valves, so as to realize the □8 θ constant deceleration braking control for the brake disc 3 of the engineering hoisting device.
CL
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CZ safety braking control method of the present invention have been previously described. The present invention will be further described in combination with the structure of an embodiment of the safety braking system of the present invention applied to a mine hoist as shown in FIG.
4. In FIG. 4, the motor 5 provides a driving force for the reel 1 through a decelerator 8, a brake disc 3 is fixedly mounted on the reel 1, a plurality of disc brake pairs 2 may be disposed on both sides of the brake disc 3, and the oil cylinders of the disc brake pairs 2 are in communication with the oil source for braking through a hydraulic circuit 4. The hydraulic circuit 4 connected with the disc brake pairs 2 comprises multiple sets of active and standby braking circuits. When some of the main braking circuits fail, the failed main braking circuits can be timely switched to the corresponding standby braking circuits by switching the active and standby braking circuits, thus the braking effect of the disc brake pairs 2 being ensured. When the main braking circuits return to normal, the corresponding main braking circuits are switched back to resume their supply of hydraulic fluid to the disc brake pairs 2.
A speed sensor 7 is disposed on an outer periphery of the brake disc
3. A signal of rotation speed of the brake disc 3 measured by the speed sensor 7 is sent to an electric control equipment 6. The electric control equipment 6 is configured to determine, according to the signal of rotation speed, whether the disc brake pairs 2 all fail, for example, whether the disc brake pairs 2 fail to achieve braking effect may be determined according to the current rotation speed. If it is determined that all of the disc brake pairs 2 fail, the electric control equipment 6 sends a control signal to the motor 5, and the motor 5 controls the rotation speed of the reel 1, so as to achieve the braking effect.
For the hydraulic circuit 4 in FIG. 4, FIG. 5 shows an example of related hydraulic control of hydraulic circuits in communication with the
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QC disc brake pairs. For the convenience of description, only two sets of disc brake pairs are schematically depicted in FIG. 5, respectively the disc brake pairs 9.1 and 9.2. The rod chambers of the oil cylinders of the disc brake pairs 9.1 and 9.2 are in communication with each other, connected to electro-hydraulic proportional reversing valves 6.1 and 6.2 via a plurality of electromagnetic on-off valves 8.1 and 8.2, and connected to the oil tank via electromagnetic on-off valves 8.3 and 8.4.
The electro-hydraulic proportional reversing valves 6.1 and 6.2 are respectively in communication with accumulators 7.1 and 7.2 and both in communication with oil pumps 2.1 and 2.2 at the same time. The process of constant deceleration braking can be realized by providing pressure oil to the disc brake pairs via either the oil pumps 2.1 and 2.2 or the accumulator 7.1 or 7.2.
For example, when the electromagnetic on-off valve 8.3 is energized, the communication relationship between the disc brake pairs 9.1, 9.2 and the oil tank is cut off. At this time, 10V voltage is provided to the electro-hydraulic proportional reversing valve 6.1, which makes the electro-hydraulic proportional reversing valve 6.1 work in the left position. The pressure oil pumped out of the oil pump 2.1 enters the electro-hydraulic proportional reversing valve 6.1 via check valves 5.1, 5.3. After flowing out of the electro-hydraulic proportional reversing valve 6.1, the pressure oil flows to the electromagnetic on-off valves 8.1 and 8.2 respectively, then converges and is pressed into the disc brake pairs 9.1 and 9.2, thereby braking effect of the disc brake pairs on the brake disc being realized. At the same time, the pressure oil will also flow respectively to accumulators 7.1 and 7.2 for pressure storage through check valves 5.3 and 5.4. Relief valves 4.1 and 4.2 are configured to adjust the maximum pressure of the oil pumps 2.1 and 2.2, while relief valves 4.3 and 4.4 are configured to provide maximum storage pressure protection for accumulators 7.1 and 7.2, respectively.
In the process of normal operation braking, for example, when the mine hoist arrives at a parking spot or temporarily stops for maintenance, □5 θ generally the motor braking subsystem controls the motor first to decelerate the hoist until it stops, and then disc brake braking is CL
O performed by the disc brake braking subsystem. The process of disc CZ brake braking may be performed in a manner of energizing the electromagnetic on-off valve 8.4 in FIG. 5, such that the pressure oil in the oil cylinders of the disc brake pairs 9.1 and 9.2 flows back to the oil tank to engage the brake and maintain the braking state of the mine hoist.
The electro-hydraulic proportional reversing valves 6.1 and 6.2 are respectively in communication with the accumulators 7.1 and 7.2. That is, the electro-hydraulic proportional reversing valve 6.1 is able to receive the pressure oil from the accumulator 7.1 and supply the oil to the disc brake pairs. This hydraulic circuit for supplying to the disc brake pairs can be used as an main braking circuit. When the main braking circuit from the accumulator 7.1 to the disc brake pairs 9.1 and 9.2 via the electro-hydraulic proportional reversing valve 6.1 fails, through switching the electro-hydraulic proportional reversing valves 6.1 and 6.2, pressure oil supply for disc brake pairs 9.1 and 9.2 can be realized by the accumulator 7.2 via the electro-hydraulic proportional reversing valve 6.2, i.e., this standby circuit plays a braking role in replacement of the main braking circuit.
In case of unexpected cases, such as a sudden power failure or out-of-control of the master control and power failure for all the departments of the coal mine, emergency safety braking needs to be performed immediately. At this time, the power required for the action of the electromagnetic on-off valves and the electro-hydraulic proportional revering valves may be supplied by a standby UPS, and the pressure required for the disc brake pairs may be supplied by the accumulators. In this case, the electromagnetic on-off valve 8.3 is energized, the control signal of the electro-hydraulic proportional reversing valve 6.1 is adjusted between -10V and 10V, and the pressure oil in the accumulator
7.1 enters directly into the electro-hydraulic proportional reversing valve 6.1. The control signal of the electro-hydraulic proportional reversing valve 6.1 which changes between -10V and 10V changes the flow therethrough, thus adjusting the pressure of the oil after flowing through
CL
0J the electro-hydraulic proportional reversing valve. The oil whose QC pressure has been adjusted enters into the electromagnetic on-off valves
8.1 and 8.2 respectively, then converges and is pressed into the disc brake pairs 9.1 and 9.2. The pressure of the oil entering the disc brake pairs can be changed by controlling the current or voltage of the electro-hydraulic proportional reversing valves. Pressure on the brake disc is controlled by the oil pressure, and the friction on the brake disc applied by the brake shoe against is adjusted, thus the braking torque is adjusted, and the constant deceleration braking control of the engineering hoisting device is realized.
When a sensing unit (such as a speed sensor or a pressure sensor) detects that normal constant deceleration braking fails or that deceleration error goes beyond the allowed range, a standby braking circuit needs to be activated to replace the failed main braking circuit to achieve constant deceleration braking. Similarly, the power required for the action of the electromagnetic on-off valve and the electro-hydraulic proportional reversing valve in the standby braking circuit can also be supplied by the standby UPS, and the pressure energy required for the disc brake pairs is supplied by the accumulators. At this time, the electro-hydraulic proportional reversing valve 6.1 may be closed, the electromagnetic on-off valves 8.1, 8.2 and 8.3 may be all energized, and the control signal of the electro-hydraulic proportional reversing valve 6.2 is adjusted between -10V and 10V, thereby the pressure oil in the accumulator 7.2 enters directly into the electro-hydraulic proportional reversing valve 6.2. The control signal of the electro-hydraulic proportional reversing valve 6.2 which changes between -10V and 10V changes the flow therethrough, and thus adjusts the pressure of the pressure oil after flowing through the electro-hydraulic proportional reversing valve. The pressure oil whose pressure has been adjusted enters into the electromagnetic on-off valves 8.1 and 8.2 respectively, □5 θ then converges and is pressed into the disc brake pairs 9.1 and 9.2.
Finally, it should be noted that: the above-mentioned embodiments CL
D are only used for explaining the present invention, not for limiting the present invention; while the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: modifications can still be made to the embodiments of the present invention, or equivalent replacement can be made to part of the technical features thereof; and these modifications or replacement, not departing from the spirit of the present invention, should all be contained in the scope of the present invention.

Claims (15)

  1. θ 1. A safety braking control system for controlling a safety braking of an Qh engineering hoisting device, comprising:
    a disc brake braking subsystem, for safely braking a brake disc of the
    22 engineering hoisting device by driving a brake shoe of a brake with a hydraulic fluid; and an electrically controlled braking subsystem, for braking a motor of the engineering hoisting device in the case of braking failure of the disc brake braking subsystem.
  2. 2. The safety braking control system according to claim 1, wherein the disc brake braking subsystem comprises:
    a disc brake group having at least one set of disc brake pairs, for safely braking the brake disc of the engineering hoisting device under the drive of the hydraulic fluid;
    at least one set of main braking circuits, respectively connected with each of the disc brake pairs in the disc brake group, for providing the corresponding disc brake pair in the disc brake group with a hydraulic fluid to control the braking torque of the disc brake pair when the engineering hoisting device requires emergency braking; and at least one set of standby braking circuits, respectively connected with each of the disc brake pairs in the disc brake group, for providing the corresponding disc brake pair with a hydraulic fluid to control the braking torque of the disc brake pair instead of the failed main braking circuits by switching hydraulic circuits, when at least part of the main braking circuits fail.
  3. 3. The safety braking control system according to claim 2, wherein the disc brake braking subsystem further comprises:
    an electro-hydraulic proportional reversing valve, disposed in the main braking circuits and the standby braking circuits, for controlling a flow and a communication relationship of the disc brake group respectively with the active braking circuits and the standby braking circuits; and a detection feedback member, for detecting a sensing signal configured to characterize the operating state of the engineering hoisting device, and for feeding back the sensing signal to the electro-hydraulic proportional reversing valve and the electrically controlled braking subsystem.
  4. 4. The safety braking control system according to claim 3, wherein the detection feedback member comprises:
    θ a sensing unit, for detecting the sensing signal and sending the sensing Qh signal to a constant decompression control cabinet; and
    L/l the constant decompression control cabinet, for providing a control signal — to the electro-hydraulic proportional reversing valve according to the received sensing signal, so as to realize constant deceleration braking control for the brake disc of the engineering hoisting device in a closed-loop control manner.
  5. 5. The safety braking control system according to claim 4, wherein the sensing unit comprises at least one of the following sensors:
    a pressure sensor, disposed in each of the main braking circuits and each of the standby braking circuits, for detecting a pressure of a hydraulic pipeline where the pressure sensor is located and sending a sensing signal of the pressure to the constant decompression control cabinet;
    a speed sensor, disposed on a reel or the brake disc of the engineering hoisting device, for detecting a rotation speed of the reel or the brake disc and sending a sensing signal of the rotation speed to the constant decompression control cabinet; and a clearance/stroke sensor, disposed in each disc brake pair, for detecting a clearance/stroke sensing signal of the disc brake pair and sending the clearance/stroke sensing signal to the constant decompression control cabinet.
  6. 6. The safety braking control system according to any one of claims 3 to 5, wherein the electrically controlled braking subsystem is configured to determine, according to the sensing signal fed back by the detection feedback member, whether the main braking circuits in the disc brake braking subsystem all fail, and brake the motor of the engineering hoisting device if the main braking circuits all fail.
  7. 7. The safety braking control system according to any one of claims 2 to 6, wherein the main braking circuits and the standby braking circuits are separately powered by independent accumulators.
  8. 8. The safety braking control system according to any one of claims 3 to 7, wherein a plurality of the electro-hydraulic proportional reversing valves are respectively disposed in each of the main braking circuits and the standby braking circuits, for realizing switching of active and standby braking circuits by controlling the communication relationship between each of the main braking circuits and the standby braking circuits, and realizing constant deceleration braking control for the brake disc of the engineering hoisting device by controlling the flow of the braking circuit in communication.
  9. 9. The safety braking control system according to any one of claims 3 to 8, wherein the main braking circuits and the standby braking circuits comprise an electromagnetic on-off valve group controlling the communication relationship of the hydraulic fluid, for controlling the on/off state of the main braking circuits or the standby braking circuits and realizing pressure relief control of the disc brake group.
  10. 10. The safety braking control system according to claim 9, wherein the electromagnetic on-off valve group, the electro-hydraulic proportional reversing valve, and the detection feedback member are powered by a standby uninterruptible power supply system under an emergency safety braking condition.
  11. 11. A mine hoist, comprising the safety braking control system according to any one of the claims 1-10, the mine hoist being the engineering hoisting device.
  12. 12. A safety braking control method of the safety braking control system according to any one of the claims 1-10, comprising:
    in case of emergency safety braking of the engineering hoisting device, safety braking is carried out on the brake disc of the engineering hoisting device by the disc brake braking subsystem through driving the brake shoe of the brake with a hydraulic fluid; and when the disc brake braking subsystem fails to brake, the motor of the engineering hoisting device is braked by the electrically controlled braking subsystem.
  13. 13. The safety braking control method according to claim 12, wherein the disc brake braking subsystem comprises: a disc brake group with at least one set of disc brake pairs, at least one set of main braking circuits and at least one set of standby braking circuits respectively connected to each disc brake pair in the disc brake group; and the step that safety braking is carried out on the brake disc of the engineering hoisting device by the disc brake braking subsystem through driving the brake shoe of the brake with a hydraulic fluid comprises:
    the at least one set of main braking circuits provides the corresponding disc brake pair in the disc brake group with a hydraulic fluid to the corresponding disc brake pair in the disc brake group to control the braking torque of the disc brake pair, such that the corresponding disc brake pair safely brakes the brake disc of the engineering hoisting device under the drive of the hydraulic fluid; and when at least part of the main braking circuits fail, the failed main braking circuits are replaced by the at least one set of standby braking circuits through switching the hydraulic circuits, so as to provide the corresponding disc brake pair with a hydraulic fluid to control the braking torque of the disc brake pair.
  14. 14. The safety braking control method according to claim 13, wherein when all of the main braking circuits in the disc brake braking subsystem fail, braking is carried out on the motor of the engineering hoisting device by the electronically controlled braking subsystem.
  15. 15. The safety braking control method according to claim 13 or 14, wherein the disc brake braking subsystem comprises: a detection feedback member, a plurality of electro-hydraulic proportional reversing valves respectively disposed in each of the main braking circuits and the standby braking circuits;
    and the safety braking control method further comprises:
    the communication relationship between each of the main braking circuits and the standby braking circuits is controlled by the electro-hydraulic proportional reversing valves according to the sensing signal detected by the detection feedback member which characterizes the operating state of the engineering hoisting device, so as to realize the switching of active and standby braking circuits; and the flow of the braking circuit in communication is controlled by the electrohydraulic proportional reversing valves, so as to realize the constant deceleration braking control for the brake disc of the engineering hoisting device.
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CN110526152A (en) * 2019-08-30 2019-12-03 太原理工大学 Multichannel protecting against shock intelligent constant deceleration brake fluid system

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CN103950859A (en) * 2014-04-01 2014-07-30 中信重工机械股份有限公司 Synchronous concurrent multi-channel constant deceleration safety braking system and method for mine hoist

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JP3508684B2 (en) * 2000-03-10 2004-03-22 コベルコ建機株式会社 Hydraulic winch
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CN201411338Y (en) * 2009-05-25 2010-02-24 天津起重设备有限公司 Block-double trolley type electric block provided with safety brake
CN103950859A (en) * 2014-04-01 2014-07-30 中信重工机械股份有限公司 Synchronous concurrent multi-channel constant deceleration safety braking system and method for mine hoist

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