CN102030280B - Mine-hoist constant deceleration safety braking system and braking method thereof - Google Patents
Mine-hoist constant deceleration safety braking system and braking method thereof Download PDFInfo
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- CN102030280B CN102030280B CN 201010534232 CN201010534232A CN102030280B CN 102030280 B CN102030280 B CN 102030280B CN 201010534232 CN201010534232 CN 201010534232 CN 201010534232 A CN201010534232 A CN 201010534232A CN 102030280 B CN102030280 B CN 102030280B
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Abstract
The invention discloses a mine-hoist constant deceleration safety braking system and a braking method thereof, and relates to the technical field of mine-hoist safety braking control. The system comprises a disk brake, a hydraulic station, an electric control device and a detection feedback device which are arranged on a drum brake disk, wherein a speed sensor arranged on the drum acquires a hoist deceleration signal and inputs the hoist deceleration signal into the electric control device; the electric control device receives the signal and compares the signal with the given speed value to send out a control command; after the control command is processed into an electric signal and compared with an oil pressure signal which is fed back by a pressure sensor on the hydraulic pipeline arranged between the outlet end of an electrohydraulic proportion reversing valve and the disk brake cylinder, an electric signal control command is sent out; and the electrohydraulic proportion reversing valve of the hydraulic station outputs a hydraulic pressure signal, which varies as the input control command varies, so as to control the motion state of the hoist by the disk brake, thereby realizing constant deceleration safety braking of the mine hoist.
Description
Technical field
The present invention relates to mine hoist safely braking control technical field, be specifically related to a kind of constant deceleration safety braking system for mine hoist and braking method thereof.
Background technology
Mine hoist is the throat equipment of mining, is bearing the vital task that mineral between the aboveground down-hole, equipment, material and personnel carry, and its performance quality is very important for Mine Safety in Production.And the mine hoist brake system is the critical component that is related to the mine hoist safety performance.
Safety arrestment refers to gig or lifting winch in operational process, for avoiding occurring the braking action of the rapid parking that safety misadventure takes.The safety arrestment process of gig is mainly finished by electro-hydraulic brake system, and wherein, electro-hydraulic brake system is comprised of disc-brake, Hydraulic Station, electrical control cubicles, detection positioner, hydraulic tubing and connecting cable.
At present, most of mine hoist still adopts constant moment of force secondary safely braking control mode " abbreviation two stage braking ", when being safety arrestment, divide two deboost phases to be applied on gig or the lifting winch with different numerical value whole lock torques, and when the first order is braked, keep lock torque constant until stop; Apply the brake mode of whole lock torques when then brake the second stage, satisfy safety procedure to the requirement of maximum braking moment, elevator system is remained static safely, be i.e. constant moment of force braking control.The inconsistent contradiction of the required lock torque of parking reliability requirement when two stage braking has solved in the safety arrestment process the required lock torque of braking deceleration size requirements and quiescence, make it to meet the relevant safety procedure requirement of country, to realize the safe and reliable work of elevator system.Because first order lock torque, i.e. P
One-levelValue after setting up, will no longer change.For the sake of security, generally by peak load, bad working environments, namely complete carrying transferred operating mode and determined P
One-levelValue, i.e. maximum braking moment requirement is carried in heavy duty like this and also can only be used this maximum braking moment to go braking under the operating mode; Because this moment, the gravity load direction was to help the elevator system braking, therefore, compared with the heavy-load lowering operating mode, carrying under the operating mode braking deceleration in the heavy duty changes greatly, braking is impacted large, and braking procedure is not steady, has same phenomenon in elevator system load change situation yet.Especially for large-scale multirope winding plant, be easy to break through the slip limit in the safety arrestment process, cause steel rope to skid, reduced safety performance and the service life of equipment, even caused serious accident.
At present, there is the import mine hoist to adopt permanent deceleration electro-hydraulic brake control system, adopt electrohydraulic servo valve that the system oil pressure in the mine hoist safety braking procedure is regulated, but contamination resistance is poor, cost is high, maintenance workload is large, reliability is low.If plant maintenance slightly has carelessness, just serious accident may occur in the safety arrestment process.
Summary of the invention
The purpose of this invention is to provide a kind of constant deceleration safety braking system for mine hoist and braking method, thereby when realizing emergency braking, braking deceleration is not changed with load, working conditions change, all the time brake by predefined velocity amplitude, improve stationarity and the safety of mine hoist braking; And this brake system has high response speed, high control precision, can implement bidirectional modulation to braking deceleration.
For achieving the above object, the present invention adopts following technical scheme:
Constant deceleration safety braking system for mine hoist of the present invention comprises the disc-brake, Hydraulic Station, electrical controller and the detection positioner that are arranged on the drum brake disc;
The Hydraulic Station of described system comprises closed-center system, at least comprise that an electric signal with input is converted to the electro-hydraulic proportion reversing valve of corresponding hydraulic flow and flow direction change, also comprise a solenoid directional control valve that switches Hydraulic Station normal operation operating mode and safety arrestment operating mode; Described closed-center system is connected with electro-hydraulic proportion reversing valve, solenoid directional control valve hydraulic tubing, and solenoid directional control valve exit end hydraulic tubing is connected to the oil cylinder of disc-brake;
The detection positioner of described system comprises the tachogenerator that is arranged on the reel;
Described tachogenerator gathers gig deceleration/decel signal and inputs electrical controller, electrical controller receives described deceleration/decel signal and compares with given velocity amplitude and sends control command, described control command is through Electric signal processing, and the electric signal control command is converted to hydraulic pressure signal to electro-hydraulic proportion reversing valve and output forms the speed closed loop control loop by the hydraulic pressure signal control dish type drg that the input electrical signal control command changes.
Described constant deceleration safety braking system for mine hoist, described detection positioner also comprises the pressure sensor on the hydraulic tubing between the oil cylinder that is arranged on electro-hydraulic proportion reversing valve exit end and disc-brake, described pressure sensor feeds back to the electro-hydraulic proportion reversing valve arrival end, the mineralization pressure close loop control circuit with the fuel injection pressure signal that collects after electrical controller is processed.
Described constant deceleration safety braking system for mine hoist, the entrance termination closed-center system of the electro-hydraulic proportion reversing valve of described Hydraulic Station is established the bypass by pass valve between described electro-hydraulic proportion reversing valve and the solenoid directional control valve; Described closed-center system and hydraulic pump source are by the check valve associated and obtain pressure oil and replenish, and described check valve allows fluid to flow and can not counter-flow towards the direction of closed-center system; Described solenoid directional control valve is connected to the oil cylinder of disc-brake through shutoff valve.
Described constant deceleration safety braking system for mine hoist, when the electric signal control command of input electro-hydraulic proportion reversing valve is positive signal, electro-hydraulic proportion reversing valve oil-feed valve port is opened, the draining valve port is closed, the oil-feed valve port UNICOM of closed-center system and electro-hydraulic proportion reversing valve, hydraulic oil enters the oil cylinder of disc-brake by electro-hydraulic proportion reversing valve oil-feed valve port, open a sluice gate or reduce the operation of lock torque, described electro-hydraulic proportion reversing valve oil-feed valve port is opened size and is in proportion with the electric signal control command of inputting.
Described constant deceleration safety braking system for mine hoist, when the electric signal control command of input electro-hydraulic proportion reversing valve is negative signal, electro-hydraulic proportion reversing valve draining valve port is opened, the oil-feed valve port is closed, the oil cylinder of disc-brake and electro-hydraulic proportion reversing valve draining valve port UNICOM, hydraulic oil flow back to the operation that fuel tank closes a floodgate or increases lock torque by electro-hydraulic proportion reversing valve draining valve port, and described electro-hydraulic proportion reversing valve draining valve port is opened size and is in proportion with the electric signal control command of inputting.
Described constant deceleration safety braking system for mine hoist, when the electric signal control command of input electro-hydraulic proportion reversing valve is zero, the electro-hydraulic proportion reversing valve spool mediates under the effect of spring force automatically, pressure oil-source entrance, the actuator port and the drain tap that lead to the disc-brake oil cylinder are in closed condition, and brake system is in and stops to regulate operating mode.
For better implementing the invention, described electro-hydraulic proportion reversing valve has the spool position feedback function, at this valve core displacement pickup is housed.Detection and the control of signal closed loop feedback by spool position are consistent the output parameter of electro-hydraulic proportion reversing valve and incoming signal.And by spool position closed loop feedback control function, make the electro-hydraulic brake control system become the high performance control system of high response speed, high control precision.
For better implementing the invention, the sliding valve structure of positive lap is adopted in described electro-hydraulic proportion reversing valve spool meta position, when making brake system be in the spool midway location of non-output parameter mode of operation, both had high response speed and high control precision, had again good closed performance and contamination resistance.
Electro-hydraulic proportion reversing valve among the present invention when input continually varying electric signal control command, is exported hydraulic power oil stream or the pressure signal of servo-actuated variation as a kind of electric liquid conversion amplifier element automatically.Because electro-hydraulic proportion reversing valve is implemented three kinds of work functions according to the difference of input control signal, namely in the safety arrestment process, have the two-way regulating function that braking deceleration is implemented to increase the lock torque operation and reduced the lock torque operation, thereby possessed the good condition that realizes the constant closed loop control.
The braking method of constant deceleration safety braking system for mine hoist of the present invention is: brake system is set the given speed value according to mine hoist safety arrestment requirement and elevator system needs, electrical controller sends control command after the deceleration/decel signal of given speed value and tachogenerator actual feedback is compared, control command is through amplifying, after the rectification mode is processed, send the electric signal control command again with behind the fuel injection pressure signal of pressure sensor feedback, be converted to hydraulic pressure signal by electro-hydraulic proportion reversing valve, hydraulic power oil stream or the pressure signal control disc-brake braking hoister that input control order changes pressed in electro-hydraulic proportion reversing valve output, implements the perseverance deceleration safety arrestment of mine hoist.
When implementing safety arrestment, brake system of the present invention can realize under different loads, friction speed and different operating mode elevator system being braked according to given constant speed.In the situation that detecting the actual deceleration degree, the detection positioner departs from given value, feedback regulation and compensating action by electric liquid closed loop braking control system, make it reduce rapidly deviation, keep the braking procedure deceleration/decel invariable, reach the effect of permanent brake snub.
In sum, owing to adopting aforesaid technical scheme, the present invention compared with prior art has following preceence:
The present invention has avoided the prior art braking deceleration to change greatly, and braking is impacted large, and braking procedure is not steady, and the brake safe reliability is owed excellent deficiency.Improved braking stationarity and safe reliability, made system reach higher safe reliability and Technical Economy.To improving the safe reliability of mine throat equipment, enhance productivity significant.
By adopting technical scheme of the present invention, sure brake system of the present invention is had braking deceleration is implemented two-way regulating function, possessed the good condition that realizes the constant closed loop control, had the deceleration and stopping performance of high response speed, high control precision, and have good contamination resistance.
Description of drawings
Fig. 1 is the block scheme of the two close loop control circuits of the present invention;
Fig. 2 is hydraulic circuit schematic diagram of the present invention;
Fig. 3 is the electro-hydraulic proportion reversing valve structural representation;
Among the figure: the 1-reel; The 2-brake disc; The 3-disc-brake; The 4-shutoff valve; The 5-solenoid directional control valve;
The 6-by pass valve; The 7-check valve; The 8-electro-hydraulic proportion reversing valve; The 9-energy storage; The 10-shutoff valve; 11-displacement pickup; 12-spool.
The specific embodiment
Constant deceleration safety braking system for mine hoist of the present invention comprises disc-brake, Hydraulic Station, electrical controller and detection positioner; Detect the lasting gig deceleration/decel signal feedback that will detect of positioner to electrical controller, electrical controller with the signal of feedback signal and setting relatively after, send control command to the electro-hydraulic proportion reversing valve of Hydraulic Station, electro-hydraulic proportion reversing valve is according to hydraulic power oil stream or the action of pressure signal control dish type brake oil cylinder of input instruction exporting change.
In conjunction with shown in Figure 2, wherein the closed-center system of Hydraulic Station " the present embodiment is selected energy storage 9 ", electro-hydraulic proportion reversing valve 8 and solenoid directional control valve 5 are in turn connected to form hydraulic circuit by pipeline, described solenoid directional control valve 5 is connected to disc-brake 3 by shutoff valve 4, specifically is connected to the oil cylinder of disc-brake; Establish bypass by pass valve 6 between electro-hydraulic proportion reversing valve 8 and the solenoid directional control valve 5; Described energy storage 9 is connected to pumping source through check valve 7, and described check valve 7 allows fluids to flow and can not counter-flow towards the direction of closed-center system 9.Wherein electro-hydraulic proportion reversing valve 8 is electric liquid conversion amplifier elements, and input continually varying electric signal control command is exported the hydraulic power oil stream of servo-actuated variation; Energy storage 9 provides control presssure oil for hydraulic brake system as the oil sources for subsequent use of system when safety arrestment comprises power failure; By pass valve 6 is used for limiting brake system prefabricatedly starts building to do oil pressure; Solenoid directional control valve 5 is in order to the switching in work loop and safety arrestment loop; The pressure oil-source that check valve 7 is used for coming with oil pump carries out one-way conduction and oppositely closes; Shutoff valve 10 is what to be used in when maintenance to the energy storage draining; Shutoff valve 4 is when maintenance to be used for cutting off that oil flows between Hydraulic Station and the disc-brake 3; Disc-brake 3 is as the hydraulic pressure of whole system and power conversion device, also is the braking power element; The piston rod mechanical connection brake disc 2 of disc-brake 3 oil cylinders, brake disc are close to friction with the reel wheel hub and are produced braking force under the effect of disc-brake 3 oil cylinders.
In conjunction with shown in Figure 3, electro-hydraulic proportion reversing valve 8 is selected three-position four-way valve, and at this valve core displacement pickup 11 is housed, the sliding valve structure of positive lap is adopted in described electro-hydraulic proportion reversing valve spool 12 meta positions, when making brake system be in the spool midway location of non-output parameter mode of operation, both had high response speed and high control precision, had again good closed performance and contamination resistance.
In conjunction with shown in Figure 1, the pressure sensor that is arranged on electro-hydraulic proportion reversing valve 8 exit end feeds back to electro-hydraulic proportion reversing valve 8 arrival ends, mineralization pressure close loop control circuit with the fuel injection pressure signal that collects; Be arranged on speed sensor on the reel 1 with the gig deceleration/decel signal feedback that collects to electrical controller, electrical controller sends control command after described speed signal and given velocity amplitude are compared, described control command is behind Electric signal processing, send the electric signal control command again with behind the oil pressure pressure signal that sends from pressure sensor, the electric signal control command is through amplifying, after the modes such as rectification are processed, be converted to hydraulic pressure signal through electro-hydraulic proportion reversing valve 8, the hydraulic pressure signal control dish type drg formation speed closed loop control loop that the input electrical signal control command changes is pressed in electro-hydraulic proportion reversing valve 8 outputs.Be that the hydraulic pressure signal that electro-hydraulic proportion reversing valve output changes by the input electrical signal control command is the power of flow control dish type drg 3 cylinder piston rods output, excess force after the power of disc-brake cylinder piston rod output and disc-brake spring force are offset acts on brake disc 2 brake discs by brake shoe and brake disc, the state of kinematic motion of the lock torque control elevator system that forms is braking deceleration according to the Changing Pattern of input electrical signal control command, implement the control to elevator system, realized the permanent deceleration safety arrestment of constant closed loop of mine hoist.
When the constant deceleration safety braking system for mine hoist of the present embodiment is implemented, brake system is set given deceleration value according to mine hoist safety arrestment requirement and elevator system needs, electrical controller sends control command after given deceleration value and actual feedback speed signal are compared, control command is through amplifying, after the modes such as rectification are processed, send the electric signal control command again with behind the fuel injection pressure signal that sends from pressure sensor, be converted to hydraulic pressure signal by electro-hydraulic proportion reversing valve, the hydraulic pressure flow control dish type drg braking hoister that input control order changes is pressed in electro-hydraulic proportion reversing valve output, implements the perseverance deceleration safety arrestment of mine hoist.
Electro-hydraulic proportion reversing valve 8 has three kinds of work functions: when the input electrical signal instruction is zero, hydraulic valve core 12 mediates under the effect of spring force automatically, the actuator port and the drain tap that make the pressure oil-source entrance, lead to drg are in closed condition, and brake system is in and stops to regulate operating mode; In the input electrical signal instruction during for (or for negative) signal just, electro-hydraulic proportion reversing valve 8 oil-feed valve ports are opened, the draining valve port is closed, the operation of lock torque is opened a sluice gate or reduced to the oil cylinder that enters disc-brake 3 by this oil-feed valve port from the hydraulic oil with pressure energy of energy storage, and its valve port is opened size, and namely to reduce the degree size of lock torque operation proportional with the electric signal instruction size of input; In the input electrical signal instruction during for negative (or for just) signal, electro-hydraulic proportion reversing valve 8 draining valve ports are opened, the oil-feed valve port is closed, the in-oil cylinder hydraulic oil of disc-brake 3 flows back to the operation that fuel tank closes a floodgate or increases lock torque by this valve draining valve port under the retarding spring effect, the degree size that its valve port unlatching size namely increases the lock torque operation is proportional with the electric signal instruction size of inputting.Because the electrohydraulic control loop that this electro-hydraulic proportion reversing valve forms has above-mentioned three kinds of control functions, so the present invention has the two-way regulating function that braking deceleration is implemented to increase the lock torque operation and reduced lock torque in the safety arrestment process, thereby possessed the good condition that realizes the constant closed loop control.
It should be noted that, be relative to the negative signal of input electrical signal control command, the definition of positive signal in the present embodiment.
The present invention not detailed descriptionthe partly is prior art.
Claims (1)
1. a constant deceleration safety braking system for mine hoist comprises the disc-brake, Hydraulic Station, electrical controller and the detection positioner that are arranged on the drum brake disc; It is characterized in that:
The Hydraulic Station of described system comprises closed-center system (9), at least comprise that an electric signal with input is converted to the electro-hydraulic proportion reversing valve (8) of corresponding hydraulic flow and flow direction change, also comprise a solenoid directional control valve (5) that switches Hydraulic Station normal operation operating mode and safety arrestment operating mode; Described closed-center system (9) is connected with electro-hydraulic proportion reversing valve (8), solenoid directional control valve (5) hydraulic tubing, and solenoid directional control valve (5) exit end hydraulic tubing is connected to the oil cylinder of disc-brake (3);
The detection positioner of described system comprises the tachogenerator that is arranged on the reel (1);
Described tachogenerator gathers gig deceleration/decel signal and inputs electrical controller, electrical controller receives described deceleration/decel signal and compares with given velocity amplitude and sends control command, described control command is through Electric signal processing, and the electric signal control command is converted to hydraulic pressure signal to electro-hydraulic proportion reversing valve (8) and output forms the speed closed loop control loop by the hydraulic pressure signal control dish type drg (3) that the input electrical signal control command changes.
2, constant deceleration safety braking system for mine hoist according to claim 1, it is characterized in that: described detection positioner also comprises the pressure sensor on the hydraulic tubing between the oil cylinder that is arranged on electro-hydraulic proportion reversing valve (8) exit end and disc-brake (3), described pressure sensor feeds back to electro-hydraulic proportion reversing valve (8) arrival end, the mineralization pressure close loop control circuit with the fuel injection pressure signal that collects after electrical controller is processed.
3, constant deceleration safety braking system for mine hoist according to claim 1, it is characterized in that: the entrance termination closed-center system (9) of the electro-hydraulic proportion reversing valve of described Hydraulic Station (8), establish bypass by pass valve (6) between described electro-hydraulic proportion reversing valve (8) and the solenoid directional control valve (5); Described closed-center system (9) and hydraulic pump source are by check valve (7) associated and obtain pressure oil and replenish, and described check valve (7) allows fluid mobile and can not counter-flow towards the direction of closed-center system (9); Described solenoid directional control valve (5) is connected to the oil cylinder of disc-brake (3) through shutoff valve (4).
4, according to claim 1,2 or 3 described constant deceleration safety braking system for mine hoists, it is characterized in that: when the electric signal control command of input electro-hydraulic proportion reversing valve (8) is positive signal, electro-hydraulic proportion reversing valve oil-feed valve port is opened, the draining valve port is closed, the oil-feed valve port UNICOM of closed-center system (9) and electro-hydraulic proportion reversing valve (8), hydraulic oil enters the oil cylinder of disc-brake (3) by electro-hydraulic proportion reversing valve oil-feed valve port, open a sluice gate or reduce the operation of lock torque, described electro-hydraulic proportion reversing valve oil-feed valve port is opened size and is in proportion with the electric signal control command of inputting.
5, according to claim 1,2 or 3 described constant deceleration safety braking system for mine hoists, it is characterized in that: when the electric signal control command of input electro-hydraulic proportion reversing valve (8) is negative signal, electro-hydraulic proportion reversing valve draining valve port is opened, the oil-feed valve port is closed, the oil cylinder of disc-brake (3) and electro-hydraulic proportion reversing valve (8) draining valve port UNICOM, hydraulic oil flows back to the operation that fuel tank closes a floodgate or increases lock torque by electro-hydraulic proportion reversing valve draining valve port, and described electro-hydraulic proportion reversing valve draining valve port is opened size and is in proportion with the electric signal control command of inputting.
6, according to claim 1,2 or 3 described constant deceleration safety braking system for mine hoists, it is characterized in that: when the electric signal control command of input electro-hydraulic proportion reversing valve (8) is zero, the electro-hydraulic proportion reversing valve spool mediates under the effect of spring force automatically, pressure oil-source entrance, the actuator port and the drain tap that lead to the disc-brake oil cylinder are in closed condition, and brake system is in and stops to regulate operating mode.
7, according to claim 1 or 3 described constant deceleration safety braking system for mine hoists, it is characterized in that: described electro-hydraulic proportion reversing valve (8) has the spool position feedback function, at this valve core (12) displacement pickup is housed.
8, according to claim 1 or 3 described constant deceleration safety braking system for mine hoists, it is characterized in that: the sliding valve structure of positive lap is adopted in described electro-hydraulic proportion reversing valve (8) spool meta position.
9, constant deceleration safety braking system for mine hoist according to claim 2, braking method when braking is implemented, it is characterized in that: brake system is set the given speed value according to mine hoist safety arrestment requirement and elevator system needs, electrical controller sends control command after the deceleration/decel signal of given speed value and tachogenerator actual feedback is compared, control command is through amplifying, after the rectification mode is processed, send the electric signal control command again with behind the fuel injection pressure signal of pressure sensor feedback, be converted to hydraulic pressure signal by electro-hydraulic proportion reversing valve, hydraulic power oil stream or the pressure signal control disc-brake braking hoister that input control order changes pressed in electro-hydraulic proportion reversing valve output, implements the perseverance deceleration safety arrestment of mine hoist.
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| CN 201010534232 CN102030280B (en) | 2010-11-08 | 2010-11-08 | Mine-hoist constant deceleration safety braking system and braking method thereof |
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| CN 201010534232 CN102030280B (en) | 2010-11-08 | 2010-11-08 | Mine-hoist constant deceleration safety braking system and braking method thereof |
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| CN201857238U (en) * | 2010-11-08 | 2011-06-08 | 中信重工机械股份有限公司 | Constant deceleration safety braking system for mine hoist |
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2010
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| DE3204695A1 (en) * | 1982-02-11 | 1983-08-18 | Siemens AG, 1000 Berlin und 8000 München | Device for the safety braking of hoists, in particular drum-type hoists |
| DD274745A3 (en) * | 1987-11-12 | 1990-01-03 | Kali Veb K | SECURED PNEUMATIC INTAKE BRAKE CONTROL FOR FOUNDER MACHINES |
| CN2897976Y (en) * | 2006-01-17 | 2007-05-09 | 徐州重型机械有限公司 | Intelligent controller of hoisting brake for crane |
| CN201857238U (en) * | 2010-11-08 | 2011-06-08 | 中信重工机械股份有限公司 | Constant deceleration safety braking system for mine hoist |
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| CN102030280A (en) | 2011-04-27 |
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