CN102030280A - 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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- CN102030280A CN102030280A CN 201010534232 CN201010534232A CN102030280A CN 102030280 A CN102030280 A CN 102030280A CN 201010534232 CN201010534232 CN 201010534232 CN 201010534232 A CN201010534232 A CN 201010534232A CN 102030280 A CN102030280 A CN 102030280A
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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 safety arrestment control technology field, be specifically related to permanent deceleration sure brake system of a kind of 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 is meant 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 made up of disc-brake, Hydraulic Station, electrical control cubicles, detection positioner, hydraulic tubing and connecting cable.
At present, most of mine hoist still adopts constant force square secondary safety arrestment 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 keep lock torque constant until parking at first order glancing impact; Second stage glancing impact applies the brake mode of whole lock torques then, satisfies the requirement of safety procedure to maximum braking moment, elevator system is remained static safely, i.e. constant force square control of braking.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, promptly complete carrying transferred operating mode and determined P
One-levelThe value, i.e. maximum braking moment requirement, like this carry in the heavy duty also can only use under the operating mode this maximum braking moment go the braking; Because this moment, the gravity load direction was to help the elevator system braking, therefore, transferred operating mode with heavy duty and compared, carrying under the operating mode braking deceleration in the heavy duty changes greatly, braking is impacted big, and braking procedure is not steady, has same phenomenon under 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 device ' and service life, even caused serious accident.
At present, have 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, the cost height, maintenance workload is big, reliability is low.If plant maintenance has carelessness slightly, just serious accident may take place in the safety arrestment process.
Summary of the invention
The purpose of this invention is to provide permanent deceleration sure brake system of a kind of 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 the stationarity and the safety of mine hoist braking; And this brake system has high response speed, high control accuracy, can implement bidirectional modulation to braking deceleration.
For achieving the above object, the present invention adopts following technical scheme:
The permanent deceleration sure brake system of mine hoist of the present invention comprises the disc-brake, Hydraulic Station, electrical controller and the detection positioner that are arranged on the reel 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 change liquid flow path direction, also comprises 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 disc-brake oil cylinder;
The detection positioner of described system comprises the tachogenerator that is arranged on the reel;
Described tachogenerator is gathered gig deceleration/decel signal and is imported electrical controller, electrical controller receives described deceleration/decel signal and compares with given velocity amplitude and sends control command, described control command is handled through electric signal, 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.
The permanent deceleration sure brake system of described mine hoist, described detection positioner also comprises and is arranged on the pressure sensor on the hydraulic tubing between electro-hydraulic proportion reversing valve exit end and the disc-brake oil cylinder, described pressure sensor feeds back to the electro-hydraulic proportion reversing valve arrival end with the fuel injection pressure signal that collects after electrical controller is handled, form the pressure closed loop control loop.
The permanent deceleration sure brake system of described mine hoist, the inlet 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 disc-brake oil cylinder through shutoff valve.
The permanent deceleration sure brake system of described 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 disc-brake oil cylinder 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 importing.
The permanent deceleration sure brake system of described 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, disc-brake oil cylinder 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 importing.
The permanent deceleration sure brake system of described 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, actuator port and drain tap that pressure oil-source entered the mouth, led to the disc-brake oil cylinder are in closed condition, and brake system is in and stops to regulate operating mode.
Be better implement the invention, described electro-hydraulic proportion reversing valve has the spool position feedback function, on this valve core displacement pickup is housed.Detection and signal close-loop feedback control by spool position are consistent the output parameter of electro-hydraulic proportion reversing valve and incoming signal.And, make the electro-hydraulic brake control system become the high performance control system of high response speed, high control accuracy by spool position close-loop feedback control function.
Be better implement 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 accuracy, had good closed performance and contamination resistance again.
Electro-hydraulic proportion reversing valve among the present invention when input continually varying electric signal control command, is exported hydraulic power oil stream or pressure signal that servo-actuated changes 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, promptly in the safety arrestment process, have the bidirectional modulation 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 the permanent deceleration sure brake system of 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 handled, send the electric signal control command after relatively again with from the fuel injection pressure signal of pressure sensor feedback, be converted to hydraulic pressure signal by electro-hydraulic proportion reversing valve, the hydraulic power oil stream of input control order instruction variation or the state of kinematic motion of pressure signal control disc-brake braking gig, the perseverance deceleration safety arrestment of enforcement mine hoist are pressed in electro-hydraulic proportion reversing valve output.
When implementing safety arrestment, brake system of the present invention can be implemented under different loads, friction speed and the different operating mode, and elevator system is braked according to given constant speed.Detect under the situation that the actual deceleration degree departs from given value detecting positioner, feedback regulation and compensating action by electric liquid closed loop braking control system, make it reduce deviation rapidly, keep the braking procedure deceleration/decel invariable, reach the effect of permanent brake snub.
In sum, owing to adopt 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 big, 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 Technological Economy.To improving the safe reliability of mine throat equipment, it is significant to enhance productivity.
By adopting technical scheme of the present invention, sure brake system of the present invention is had braking deceleration is implemented the bidirectional modulation function, possessed the good condition that realizes the constant closed loop control, had the deceleration and stopping performance of high response speed, high control accuracy, 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 a 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
The permanent deceleration sure brake system of mine hoist of the present invention comprises disc-brake, Hydraulic Station, electrical controller and detection positioner; Detecting positioner continues detected gig deceleration/decel signal feedback to electrical controller, electrical controller with the signal of feedback signal and setting relatively after, send the electro-hydraulic proportion reversing valve of control command, electro-hydraulic proportion reversing valve hydraulic power oil stream that output changes according to input instruction or the action of pressure signal control dish type brake oil cylinder to Hydraulic Station.
In conjunction with shown in Figure 2, wherein the closed-center system of Hydraulic Station " present embodiment is selected energy storage 9 for use ", 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, input continually varying electric signal control command, the hydraulic power oil stream that the output servo-actuated changes; Energy storage 9 provides control presssure oil for hydraulic brake system as the standby oil sources 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 normal operation loop and safety arrestment loop; The pressure oil-source that check valve 7 is used for coming with oil pump carries out unidirectional conducting and oppositely closes; Shutoff valve 10 is that maintenance the time is used for to the energy storage draining; Shutoff valve 4 is that maintenance the time is used for cutting off that oil flows between Hydraulic Station and the disc-brake 3; Disc-brake 3 is as the hydraulic pressure of total 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 for use, and displacement pickup 11 is housed on this valve core, 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 accuracy, had good closed performance and contamination resistance again.
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 with the fuel injection pressure signal that collects, and forms the pressure closed loop control loop; 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 after electric signal is handled, send the electric signal control command with the oil pressure pressure signal that sends from pressure sensor after relatively again, the electric signal control command is through amplifying, after modes such as rectification are handled, 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 oil cylinder piston bars output, excess force after the power of disc-brake oil cylinder piston bar 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, implemented control, realized the permanent deceleration safety arrestment of constant closed loop of mine hoist elevator system.
When the permanent deceleration sure brake system of the mine hoist of 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 modes such as rectification are handled, send the electric signal control command with the fuel injection pressure signal that sends from pressure sensor after relatively again, be converted to hydraulic pressure signal by electro-hydraulic proportion reversing valve, the state of kinematic motion of the hydraulic pressure flow control dish type drg braking gig of input control order instruction variation 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, make the pressure oil-source inlet, be in closed condition towards working of brakes hydraulic fluid port and drain tap, brake system is in and stops to regulate operating mode; In input electrical signal instruction during for (or for bearing) signal just, electro-hydraulic proportion reversing valve 8 oil-feed valve ports are opened, the draining valve port is closed, the hydraulic oil with pressure energy from energy storage enters the operation that lock torque was opened a sluice gate or reduced to disc-brake 3 oil cylinders by this oil-feed valve port, and the degree electric signal instruction size big or small and that import that its valve port unlatching size promptly reduces the lock torque operation is proportional; In 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, disc-brake 3 in-oil cylinder hydraulic oil flow 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 promptly increases the lock torque operation is proportional with the electric signal instruction size of importing.Because the electrohydraulic control loop that this electro-hydraulic proportion reversing valve is formed has above-mentioned three kinds of controllable function, so the present invention has the bidirectional modulation 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 a prior art.
Claims (9)
1. the permanent deceleration sure brake system of mine hoist comprises the disc-brake, Hydraulic Station, electrical controller and the detection positioner that are arranged on the reel 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 change liquid flow path direction, also comprises 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 disc-brake (3) oil cylinder;
The detection positioner of described system comprises the tachogenerator that is arranged on the reel (1);
Described tachogenerator is gathered gig deceleration/decel signal and is imported electrical controller, electrical controller receives described deceleration/decel signal and compares with given velocity amplitude and sends control command, described control command is handled through electric signal, 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. the permanent deceleration sure brake system of mine hoist according to claim 1, it is characterized in that: described detection positioner also comprises and is arranged on the pressure sensor on the hydraulic tubing between electro-hydraulic proportion reversing valve (8) exit end and disc-brake (3) oil cylinder, described pressure sensor feeds back to electro-hydraulic proportion reversing valve (8) arrival end with the fuel injection pressure signal that collects after electrical controller is handled, form the pressure closed loop control loop.
3. the permanent deceleration sure brake system of mine hoist according to claim 1, it is characterized in that: the inlet 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 (8) is connected to disc-brake (3) oil cylinder through shutoff valve (4).
4. according to claim 1, the permanent deceleration sure brake system of 2 or 3 described 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 disc-brake (3) oil cylinder 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 importing.
5. according to claim 1, the permanent deceleration sure brake system of 2 or 3 described 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, disc-brake (3) oil cylinder and electro-hydraulic proportion reversing valve (8) 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 importing.
6. according to claim 1, the permanent deceleration sure brake system of 2 or 3 described 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, actuator port and drain tap that pressure oil-source entered the mouth, led 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 the permanent deceleration sure brake system of 3 described mine hoists, it is characterized in that: described electro-hydraulic proportion reversing valve (8) has the spool position feedback function, on this valve core (12) displacement pickup is housed.
8. according to claim 1 or the permanent deceleration sure brake system of 3 described 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. the permanent deceleration sure brake system of mine hoist according to claim 1 and 2, 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 handled, send the electric signal control command after relatively again with from the fuel injection pressure signal of pressure sensor feedback, be converted to hydraulic pressure signal by electro-hydraulic proportion reversing valve, the hydraulic power oil stream of input control order instruction variation or the state of kinematic motion of pressure signal control disc-brake braking gig, the perseverance deceleration safety arrestment of enforcement mine hoist are pressed in electro-hydraulic proportion reversing valve output.
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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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