SU1255540A2 - Device for protecting against rope slacking in case of jamming of lifting container in shaft - Google Patents

Description

The invention relates to lifting and transporting devices and can be used to protect the mine hoist from rope inlet, code alarms from a lifting vessel to the machine room, as well as to automatically control the mode of movement of the vessel in the shaft shaft and is an improvement of the known device according to ed. St. No. 861266.

The purpose of the invention is to increase the reliability of the lift protection.

The drawing shows a functional diagram of the device.

The device contains control keys 1 and 2 connected to the point of connection of the isolated section 3 in the communication line vessel 4 - rope 5 - pulley 6 - paving platform ("ground) 7 - capacity (not indicated)" ground-vessel - vessel 4 a controlled limit switch 8, which interacts with the vessel suspension 9, which performs, for example, the function of a lift rope control sensor (for control key 1) and an emergency condition sensor 10, for example, a code signal (for control key 2). The keys 1 and 2 include bandpass filters 11 and a current meter 12, for example, a current transformer, and a current regulator 13, for example, an electronic AC key, with control inputs connected to the outputs of the current meter 12. The device also contains blocks 14 and 15 of exciting high-frequency currents in the communication line, which are stationary and made each in the form of series-connected high-frequency generator 16, current meter 17, band-pass filter 18 tuned to pass the frequency of the high-frequency generator 16, and a transformer 19 (a multi-turn winding inductively connected to a lifting rope 5 and installed at the minimum beat of the rope 5 under the pulley 6 (i.e., before galvanic connection of the rope 5 with the "earth"), and connected the outputs of the current meters 17 in the high frequency current excitation units 14 in the communication line, the relay blocks 20 controlling the signal blocks 21 of the safety brake 22 of the elevator and the unit 23 automatically removing the cable inlet, made in the form of a lift inlet compensator mounted under the bottom 7 a rope comprising a lifting rope 5 of blocks 24, connected to it through a tension cable 25 of load 26, guides 27 of movement of load 28, and a node (not indicated) of stopping the load in guide rails x-drive 28 connected through a relay unit 20 to a source (not shown) energy.

The device works as follows.

In the initial state, the switch 8, which interacts with the node 9, controls

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the overlap of the hoisting rope, mounted on vessel 4, is closed, so the line of communication is vessel 4 — rope 5 — shchiv 6 — podshchikvny platform (“earth”) 7 — capacity “earth-vessel — vessel 4 is closed at its end with control key 1 . The high frequency generator 16 in the high frequency current excitation unit 14 in the communication line is in operation all the time. Therefore, a current of a certain value flows through the current meter 17, the bandpass filter 18 and the winding 19, which maintains the block 20 connected to the current meter 17, which in turn maintains the signal block 21, the lift safety brake 22 and the block 23. A light indicator (not shown) connected to the output of the current meter 12 of the control switch 1 is lit.

The signal from the sensor 10 of the code signals to the key 2 control is not received. Therefore, its indicator light is not illuminated.

When the vessel 4 moves along the shaft and there is no disruption to the normal movement of the vessel 4, the distance between the vessel 4 and the reinforcement and the walls of the shaft, and thus the size of the earth vessel, changes the length of the vessel zi, the resistance value in it and the magnitude of the high frequency current, including the current passing through the switch 8, the band-pass filter 11, configured to pass the frequency of the current of the high frequency generator 16 and through its current meter 12 and the current regulator 13 in key 1 management When the current changes, the meter 12 responds to this change, as a result of which the current regulator 13 changes the current in the communication line until it becomes equal to the initial one. The indicator light in control key 1 is illuminated at this time.

The process of stabilization of the current in the communication line is almost instantaneous, i.e., if, for example, there is a change in the capacitance of the earth vessel, in which the resistance to the high frequency current in the communication line increases, then the internal resistance of the regulator 13 immediately decreases current, and the current in the communication line remains the same, and for example, as the length of the earth part of the communication line decreases, the resistance in it decreases, and the internal resistance of the regulator 14 increases, contributing to the preservation of the initial current in the communication line.

When an overlap of the hoisting rope 5 occurs during the movement of the vessel 4 down and getting stuck in the shaft of the shaft, the node 9, operates, acts on the switch 8, opens it, which breaks the circuit of the communication line in the section 3 of the rope-vessel. The switch capacitance of the switch 8 is significantly less than the capacitance of the earth vessel, therefore its rupture introduces a relatively high resistance into the communication line, which can no longer be compensated by the current regulator. Accordingly, the high frequency current defined by the high frequency generator 16 is reduced in the communication link. The current passing through the current meter 17 is reduced. The latter translates into another position the relay unit 20 controlling the protection apparatuses — the signal unit 21, the safety brake 22 of the elevator, which is triggered, brakes the elevator, and the rope unit 23 — by connecting the drive 28 to the power source, due to which the load 26 is freed from the stoppers in the guide conductors 27 and, moving along them under the action of their own weight, compensate the resulting hoisting of the hoisting rope 5 during the period of operation of the safety brake 22 of the hoist 22 and stop the lift itself. The indicator light in key 1 of the control goes out.

The force developed by the weight of the load 26 is chosen to be approximately equal to the force developed by the weight of the hoisting rope 5 with a length equal to the maximum depth of the shaft. The own weight of the vessel 4 is usually greater than this weight of the rope 5, therefore, for example, when self-removing the cause of vessel 4 getting stuck in the shaft shaft, the latter starts to fall, causing the load 26 to rise along the rails 27. The speed of the vessel 4 is damped by the lifting load 26, insufficient to break the rope 5. After tensioning the rope 5 with the vessel 4, node 9 to control

five

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the cable inlet returns the switch 8 to the closed state, which in turn returns to its initial position the entire device, in which the load 26 stops in the guides 27, and the safety brake 22 of the elevator can be disengaged. The alarm unit 21 in the engine room and the light indicator on the vessel 4 signal the readiness of the device and the elevator to work.

The control key 2 serves to supply the code signals from the vessel 4 and is triggered from the alarm state sensor 10 (code signals). The control key 2 corresponds to a high frequency current drive unit 15 in the communication line. When the key 2 controls the actuator, the signal from the current meter in the high-frequency current excitation unit 15 is fed to the control actuator 20 by the signal unit 21 - code signaling. When the control key 2 is triggered, its indicator light comes on, the signaling unit 21 of the code signaling in the engine room is turned on and the auxiliary unit (not shown) of exciting the high frequency current in the communication line is simultaneously activated by the control unit 20, from which a current appears in the receiving node of the feedback, causing its light indicator to light up. Simultaneous ignition of the light indicators in the control key 2 and in the receiving feedback node signals that the signal is from the vessel and received in the engine room.

The device works in a similar way when other protection elements are connected to it, for example, control of cable overload.

Claims (2)

1. DEVICE FOR PROTECTION AGAINST ROPE START UP AT JAMMING A LIFTING VESSEL IN THE BARREL by author. St. No. 861266, characterized in that, in order to increase the reliability of protection, it is equipped with additional control keys with emergency status sensors connected to their inputs, additional generators and additional transformers connected to the latter through bandpass filters and an automatic cable inlet elimination unit connected to the control input to the third output of the relay block, while the control keys are made on a series-connected bandpass filter, a current meter and a current regulator. 2. The device according to π. 1, characterized in that the block of elimination of the inlet of the rope is made in the form of a block enclosing the rope that is mounted under the spring plate and connected to it via a tension cable of the load, mounted for movement in the rails, and an element for locking the load in the rails, equipped with a drive, the input of which is the control block input.