SU1583342A1 - Apparatus for controlling mine hoist brake - Google Patents

Abstract

The invention relates to the field of mine hoisting and is intended to control the brake of a mine hoist. The purpose of the invention is to increase the safety of the operation of the SPM. The device contains pneumatic actuator and control electric channels. A pressure regulator is connected to the pneumatic actuating channel, which is connected via electro-pneumatic valves with the brake cylinders of the ballast tube. A speed sensor is inputted into the electrical control channel, the signal from which in the first comparator (K) is compared with the signal of the speed difference generator. In the other, the signal from the speed sensor is compared to a minimum speed master signal. In case of exceeding the settings of both K, the corresponding deceleration relays or speed relays are triggered and thereby de-energize the coil of the electropneumatic valves during safety braking. In service braking mode, the brake force in the brake cylinders is controlled by means of a control unit, a rectifying bridge and a pressure regulator control coil. In the event of a power failure, the electrical circuit is powered by a capacitor bank. 1 il.

Description

This invention relates to the field of mine hoisting and is intended to control the brake of a mine hoist.

The purpose of the invention is to increase the safety of operation of the mine hoist.

The drawing shows a functional diagram of the proposed device.

The device contains two brake actuators, each of which consists of brake cylinders 1 and 2, a pressure regulator 3 with a control coil 4, electropneumatic valves 5-7

with coils 8-10, respectively, air collector 11, speed sensor 12, storage capacitor 13, first (discharge) resistor 14, first comparator 15 for comparing actual and stored speeds, speed difference setting unit 16, deceleration relay 17 with a closing contact 18, the second minimum speed comparator 19, the minimum speed setting unit 20, the speed relay 21 with the closing contact 22, the closing contact 23 of the safety braking contactor, the first intermediate relay 24 with the closing contacts 25-27 and the opening contact 28, time relay 29 with contact 30 having a shutdown time delay, a second intermediate relay 31 with closing contacts 32 and 33, a command device 34, a rectifying bridge 35, resistors 36 and 37, a block 38 of capacitors containing a resistor 37, a diode 39. Sensor 12 The speed consists of a tachogenerator 40 (e.g., alternating voltage), a rectifying bridge 41, an inductance filter 42, and capacitors 43 and 44.

The device is intended for operation in operating mode and safety braking.

When charging the machine, contact 23 closes, turning on relays 24 and 29. Contacts 25, 26, 27 and 30 are closed, contact 28 opens. The closure of the contacts 25 and 30 leads to the inclusion of the relay 31, which by its contact 33 turns on the coils 8-10. The contact 32 closes, preparing the circuit for further work.

When the machine is moving, the voltage at the output of the speed sensor 12 is proportional to the speed of the machine. This voltage is fed to one input of the comparator 19, and to the second input is the voltage corresponding to the minimum speed out ° C of the setpoint 20 minimum speed, below which you can brake arbitrarily sharply. If the actual hoist speed is greater than V, the comparator 19 is triggered, 01

em. This closes contact 2.2. relay 21 speed connected to the output of the comparator 19.

In the operating braking mode, when the contact 27 is closed 1, and 28 is open, the current in the control winding of the pressure regulator 4 is regulated by moving the commander 34.

Safety braking is carried out as follows.

Let the machine move at a constant speed V0 greater than V

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With

This contact, 22 is closed. When giving the command for safety braking, i.e. when the contactor 23 is opened, the relay 24 “turns off.” Closing its contact 28 and opening the contact 27, while the current in the winding 4 of the control of the pressure regulator 3 determines the first degree of braking, the coil of the secondary switch 29 loses power, as a result

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five

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What begins the countdown to the opening of contact 30.

In addition, the opening of the contact 25 of the relay 24 prepares the power supply circuit of the relay 31 in the safety braking mode, and the opening of the contact 26 leads to the disconnection of the capacitor 13 from the speed sensor 12. The capacitor 13 maintains the voltage that was output by the speed sensor before braking began, in other words, the value of V is remembered. Further, the voltage on the capacitor 13 remains constant, and the voltage on the output of the speed sensor 12 varies in accordance with the change in the actual speed of the machine.

After the dwell time of the relay 29, which is equal to the idle time and brake actuation time, the braking force of the first stage of the homing process is set. Further, depending on the operating mode of the hoisting machine, the device performs two variants of the braking process.

Lifting cargo. In this case, the actual speed of the machine under the action of the first stage of deceleration is reduced quickly enough, the amount of deceleration satisfies the safety rules. The comparator 15 input is turned on for comparison of the voltages on the capacitor 13 and on the output of the speed sensor 12, after some time from the beginning of the safety braking the difference of these voltages exceeds the setpoint setpoint 16, the comparator 15 is activated by turning on the relay 17, which closes its contact 18. Through the time interval, which should be somewhat longer than the first-stage deceleration time, expires on the opening of contact 30, but due to the contact 18 closed for this time, relay 31 will not be de-energized, Act 33 remains closed, the coil 8 - 10 - included, the braking force is not further increased. The device performs first-stage braking when lifting a load. After deceleration to mN, contact 22 opens, de-energizes the kagushka relay 31, its contact 33 turns off the coils 8-10, and valves 5-7 turn on the full braking force, releasing all the air from the brake cylinders 1 and 2. -

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braking torque pass when stopping the machine.

Descent cargo and distilled empty vessels. In this case, under the action of the first stage of braking, the speed of the machine does not decrease sufficiently quickly. Therefore, by the time the contact 30 is opened, the difference between the voltage stored at capacitor 13 at the output of sensor 12 does not exceed the setpoint of setpoint 16, contact 18 does not close. Therefore, the opening of the contact 30 leads to de-energizing the relay 31 and, accordingly, the coils 8-10. The device applies full braking force. Subsequently, as the speed slows down during deceleration, the comparator 15 is activated and the contact 18 is closed, but this does not turn on the coils 8 - 10, since the contact 32 blocks the day of the relay 31

If safety braking occurs due to relieving voltage.

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the valves, the first lead of the capacitor unit and the first lead of the winding of the first intermediate relay, the second lead of which is connected to the second lead of the DC power source through the closing contact of the safety braking contactor, the second lead of the second electro-pneumatic valve is connected to the second lead of the third electro-pneumatic valve, characterized in that, in order to increase the safety of operation of the mine hoist, it contains a speed sensor, two resistors, remembering capacitor, two comparators, variable speed limiter, minimum speed master, commander, rectifier bridge, speed, deceleration and time relays with corresponding contacts, the second intermediate relay with corresponding contacts, the first speed sensor output through

power supply from a lifting installation or co 25 the first resistor is connected to the second one is connected to them, the unit is grounded by a capacitor, grounded and through the second circuit 38 feeds all elements, including the contact of the first intermediate

These include the comparators 15 and 19, the dials 16 and 20 of the relay 17, 21, 31, and the valve coils 8-10, ensuring their proper operation during safety braking. Diode 39 eliminates the discharge of the block of capacitors 38 through the power source when the supply voltage disappears. Resistor 37 limits the charge current of the capacitors 38. Resistor 14 provides a discharge circuit for the storage capacitor 13 in the monitoring mode by the capacitor 13 of the actual speed of the machine when the contact 26 is closed.

Claims (1)

Invention Formula A shaft lifting machine brake control device containing a compressed air supply network connected through a pressure regulator and a first electro-pneumatic valve 35 relay connected to the first inputs of the first comparator and the first output 30 of the capacitor, the second output of which is connected to the second output of the speed sensor and the first input of the second comparator, the second input of which is connected to the output of the minimum speed generator, and the output through the speed ram is grounded, the second input of the first comparator is connected to the output of the speed difference controller, and the output is grounded through a ground relay, The 4Q contact of which is connected to the second output of the capacitor bank, through the second closing contact of the second intermediate relay to the second terminals of the first and second coils 45 electropneumatic valves, through the second resistor and the disconnecting contact of the first intermediate relay, to the first terminal of the control coil of the pressure regulator, through contact with the solenoid to the second and third electropneumatic, 50 th time to turn off the time relay and . Valves whose outputs are connected respectively to the first and second brake cylinders, a diode, a control coil of the pressure regulator, the first intermediate relay with  corresponding contacts, a DC power supply, the first terminal of which is connected to the first leads of electropneumatic coils relay connected to the first inputs of the first comparator and the first output a second capacitor, the second input of which is connected to the output of the minimum speed setting device, and the output is grounded through the speed ram, the second input of the first comparator is connected to the output of the speed difference setting device, and is grounded through a ground relay, which contact is connected to the second output of the capacitor unit, through the second closing contact of the second intermediate relay to the second terminals of the first and second coils electropneumatic valves, through the second resistor and the disconnecting contact of the first intermediate relay, to the first terminal of the control coil of the pressure regulator, through contact with the solenoid the closing relay of the speed relay - with the second output of the second intermediate relay, through the first closing contact of the second intermediate relay and the shorting contact of the speed relay - with the second output of the second intermediate relay, through the first closing contact of the second intermediate relay and the first closing contact of the first intermediate relay with the second output of the second intermediate relay and through a directly connected diode - with the second output ns of the DC power supply source, the first output of which is grounded and connected to the first terminals in orogo intermediate relays, time relays, a second terminal coupled to a second terminal of the first intermediate relay, 33428 The first and second terminals of the switchgear are connected respectively to the first and second outputs of the rectifying bridge, the third and fourth terminals of which are connected to the second and third closing contacts of the first intermediate relay with the first controller of the pressure regulator control coil.