SU1379216A1 - Device for controlling mine hoist brake - Google Patents

Abstract

The invention relates to the field of mine nodes 1) Sma, specifically to brake systems under 1, emngch installations. The purpose of the invention is to increase the reliability and safety of operation of the mine node machine. The device contains brake cylinders 1 and 2, electro valves 3 and 4 with coils 5 and 6, pressure reducing valves 7 and 8, pressure regulators 9 and 10 with coils II and 12, air collector 13, speed sensors 14 and 15, two comparators 16 and 17 minimum speed, two controllers 18 and 19 minimum speed, two relays 20 and 21 with normally open contacts 22 and 23, two differential links 24 and 25, two controlors 26 and 27 slowdowns, two adders 28 and 29, two proportional amplifiers 30 and 31, two diodes 32 and 33, a coil 34 of the safety stop contactor and two switches lev els of contact 35 and 36, the key 37 of the safety brake, a manual control sequencer 38 and the brake 39. The rectifier bridge 1 yl. yu (L

Description

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The invention relates to the field of mine lifting, specifically to brake systems and mining lifting installations.

The purpose of the invention is the guviepenie reliability and safety of operation niaxTHofi lifting ManjHHbi.

The drawing is given a functional diagram of the proposed device.

The device contains brake cylinders 1 and 2, solenoid valves 3 and 4 with coils 5 and 6, pressure reducing valves 7 and 8, pressure regulators 9 and 10 with catapacs 1 1 and 12, respectively, air collector 13. analog sensors 14 and 15 speeds, two comparators 16 and 17 of the minimum speed, two setting points 18 and 19 of the minimum speed, two relays 20 and 21 with normally open contacts 22 and 23, respectively, two differential links 24 and 25, two setting points 26 and 27 slow; . two adders 28 and 29, the bottom of the proportional Wuxi, 11, the bodies 30 and 31, two diodes 32 and 33. the coil 34 of the contact () and the safety braking and its two || 1K) chuck) | cich contact 35 and 36, key 37 11red (). Temple) single () second () |) can. commandoappa () at 38 manual control: 1 brake and rectifying 39.

The device is intended for operation in two modes: working and safety braking of the lifting machine.

In the working braking mode, the key 37 is closed, the coils 5, 6 and 34 are under current, therefore the lazans 3 and 4 are closed, and the switches 35 and 36 are connected; the command unit 38 with the coils II and 12 reg. pressure tori. Change the controls for the handles of the command device 38 with the worktable)) I go. 1 tori 9 and I) pressure, establish the necessary pressure in the brake pi.chindra 1 and 2. and therefore, the required braking torque, butt) 1-vaem1) | nd to the drum under the lifting mechanism.

When the key is opened, 37 p) is stored. A 1 foot () braking system.111 energizes the hoisting unit to de-energize the coil 34 of the safety braking contactor and the coil 5 and 6 of the electric valves. At JTOM, pins 35 and ZG) switch, connecting coils II and 12 pressure controllers .1 with differential outputs, gx amplify .1 (th, and q.1apan 3 and 4 connect brake chi. 1 and 2 through reducing valves 7 and 8 s atm () The pressure is discharged in the brake cylinders. It is carried out to a size that corresponds to the choice of the brake of the LOW operation. This value is set by the corresponding setting of the reducing valves 7 and 8.

The braking torque at safety braking 1) is set with the help of regulators 9 and I) of pressure and brake cylinders 1 and 2 so that the deceleration of G1od1, the removable machine is maintained at the required level. Managed by the re / street of the hoover / k nor from HOMonibK) two identical

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control channels, each of which contains an analog speed sensor 14 (15), the output of which has a voltage, the amplitude of which is proportional to the lifting speed. Much. After differentiating the speed signal at the output of the differential link 24 (25), there is a slowdown signal of the elevator, which arrives at one of the inputs of the adder 28 (29). To the second input of the adder from the output of the setting unit 26 (27) of deceleration, a nominal voltage corresponding to the deceleration specified for this lifting machine is selected from a range of 1.5–5 for vertical ground, it depends on the angle of inclination of the trunk for inclined lifting machinery .

The output voltage of the adder is applied to the proportional amplifier 30 (31), the output voltage of which is proportional to the difference between the specified deceleration and actually m. positive when the actual deceleration is exceeded and negative if the specified deceleration is exceeded. The output voltage of the proportional amplifier is connected through a diode 32 (33) and contacts 22 and 35 (23 and 36) in the safety braking mode to the coil 11 (12) of the corresponding pressure regulator 9 (10).

Since katun1ki and 12 pressure regulators 9 and 10 need to be powered with constant current, diodes 32 and 33 are inserted.

In addition, each of the control channels is equipped with a minimum speed comparator 16 (17), a speed signal is applied to one of the inputs and a voltage corresponding to a minimum speed of 0.1-0.3 m / s to the second. At a speed of 1 DL, which is equal to or less than the minimum when the braking of the machine with a slowdown. The patient is no longer dangerous, the output voltage of the comparator 16 (17) changes from 10 15 to zero, the relay 20 (21) de-energizes and . closes contact 22 (23). At this, the current in coils 11 (12) drops to zero and a full braking torque is applied. When the actual speed of this level exceeds the speed of the relay 20 (21), current is flowed around again and the coils of the controllers II (12) are connected to the outputs of the proportional amplifier 30 (31).

The safety braking process is carried out as follows.

Immediately after releasing the safety braking key 37 and selecting the idle brake speeds 3, 4. 7 and 8 of the brake idle, the difference between the actual deceleration and the specified max. M., The output voltage of the proportional amplifier 30 (31) is negative, the valve 32 (33) is closed and there will be no current in coils 11 and 12. Regulators tori 9 and 10 maximally open

on the release of air from cylinders 1 and 2, the braking torque increases as sharply as possible. As the actual deceleration increases and when it exceeds the value specified in Cat 11 - 12, current appears and the growth rate of the braking torque and deceleration decreases.

This system works statically with an error: when the actual deceleration of the error set in coils II and 12 is exceeded, a current value is established that corresponds to the required braking torque. The magnitude of the error is determined by the parameters of the system, therefore the specified deceleration should be set with account of the statism in advance.

If the requirements for the regulation of the brake .moment are such that a need arises in an astatic system, then instead of a proportional controller, a proportional-integral controller should be put. Further, until the speed drops to the maximum level, the device operates in the following mode: deviations of the actual delay in one direction or another, for example, due to fluctuations of effort in the ropes, cause a corresponding change in current in the catches, which “returns the deceleration to the specified level. In this case, the device can both reduce and increase the brake torque. When the speed drops to the level of maximum speed, contacts 10 and 23 are closed, the machine stops with maximum accelerated release of air from brake cylinders 1 and 2 through pressure regulators 9 and 10 to the atmosphere.

Claims (1)

Invention Formula A device for controlling the brake: i) m of a mine hoist, containing 0 five brake cylinders, solenoid valves, pressure reducing valves, air collector, pressure regulator, manual brake control command device, speed sensors, minimum speed comparators, minimum speed setting points, differentiating links, dry mattresses, voltage source, safety braking key, characterized in that In order to increase the reliability and safety of operation of the shaft hoist, it is equipped with an additional pressure regulator, two proportional amplifiers, two setting controllers. for two valves, two relays and a safety braking contactor, the output of each solenoid valve is connected via a pressure reducing valve to the atmosphere, the output of each speed sensor is connected to one of the inputs of the minimum speed comparator, the input of one of the differentiating links, the second the minimum speed comparator input is connected to the output of the minimum speed setpoint; the output of the differentiated link is connected to one of the inputs of the adder, the second input of which is connected to the output of the setpoint depressor, output One adder through a proportional amplifier, a valve, a relay contact connected to the output of the minimum speed comparator is connected to the pressure regulator cathode, and the output of the command and control unit is controlled by a rectifying bridge and the contacts of the safety brake contactor connected to the pressure regulator coils, the safety braking contactor and the solenoid coils are connected to a voltage source through a safety braking key. 0 five