SU867836A1 - Mine hoist safety device - Google Patents

Description

(54) DEVICE PROTECTION OF MINING LIFT

The invention relates to lifting and transport engineering and can be used to protect the mining lifting installations from the rope overlap.

A mine elevator protection device is known, which contains a force sensor controlling the weight change of the hinged system connected to one of the inputs of the adder, to which another input is connected to the unit for determining the weight of the lifting rope, and to the output one of the inputs of the comparison unit, the other input of which is connected to the master block, and the output from the executive unit p.

However, the known device has insufficient protection due to the fact that it does not take into account the variable speeds of movement of the lifting vessel.

The purpose of the invention is to increase the effectiveness of protection.

This goal is achieved by the fact that the device is equipped with a speed sensor connected in series and a differentiating unit connected by an output to the third input of the adder.

The drawing shows a block diagram of the proposed device.

Claims (1)

The device contains a force sensor that controls the change in mass of the mounted system, and a speed sensor combined in a block of I sensors, a differentiation unit 2 and an integration unit 3 connected to a speed sensor of block 1, an adder A connected by an output to one of the inputs of the comparison unit 5, the other input of which is connected to the master unit 6, and to the output is the executive unit 7. The integration unit 3 together with the speed sensor performs the function of a unit for determining the weight of the hoisting rope. The inputs of the adder 4 are connected to 3 outputs of blocks 2 and 3 and the force sensor of block I. The device blocks can be implemented on standard elements, such as analog ones. The device works as follows. The sensor unit 1 generates two signals, one of which is proportional to the force on the pile pulley, the other to the speed of movement of the lifting vessel. Magnetoelastic or strain gauge sensors, for example, can be used as sensors measuring force on a pile pulley. For example, tachogenerators, digital devices operating with magnetic marks on the cable, etc., can be used as sensors that measure the speed of movement of a lifting vessel. These signals from the sensor unit simultaneously arrive at the Ayr Blrkm 2 n 3 adder. At the output of the adder 4, a signal is generated that is proportional only to the weight of the lifting vessel throughout the shaft. Therefore, when the lifting vessel hangs at any depth of the shaft, the signal produced by the adder 4 always changes from a constant value depending on the weight of the lifting vessel from the vessel to almost zero. At the output of the unit, the signal is poured in such a way that, when intelligent 1 ps-n-1, the weight of the empty vessel is 10–15% or more due to jamming or souring, the direct line 5 sends a signal to the executive unit 7, which gives a signal to stop the mine hoist. It is known that the dynamic component of the force acting on the force generator is proportional to the derivative of the linear velocity of the dropping mas. Therefore, the signal from sensor unit 1, proportional to the speed of movement of the lifting vessel, is fed to the Differentiation unit, which produces a signal proportional to the dynamic component effort This signal is fed to the first input of the adder 4 with a negative sign, and to the second input it receives a signal produced by a sensor that is proportional to the weight of the lifting vessel of the lifting wire and the dynamic component. To the third input, the adder 4 is given a signal (with a negative sign) produced by the integrating unit 3 and proportional to the weight of the hoisting rope in the process of lowering the hoisting vessel. Since the influence of the weight of the rope on the scraper pulley is determined and proportional to the path traveled by the lifting vessel, the influence of changing its weight in the process of lowering the lifting vessel can be programmed using the integration unit 3. The input of the integration unit 3 is given a signal proportional to the speed of movement of the lifting vessel along the trunk. Block 3, integrating the speed, generates a signal at the output proportional to the weight of the rope in the process of lowering the lifting vessel. At the end of each cycle, at the moment of locking the lifting mask, the integration unit 3 is reset. The adder 4 performs the summation of the signals fed to its inputs with the corresponding signs, and at its output a signal is generated that is proportional only to the weight of the lifting vessel. Thus, the proposed device favorably differs from the known one, as it allows to increase the reliability of protection of the mine hoist from the rope inlet by detecting the weight of the lifting vessel during its movement along the shaft. The invention The mine elevator protection device containing a force sensor controlling the weight change of the hinged system, connected to one of the inputs of the adder, to the other input of which a weight determination line of the lifting rope is connected, and to the output one of the inputs of the comparison unit, the other input of which is connected to a driver unit, and an output with an actuator unit, characterized in that, in order to catch the effectiveness of the protection, it is equipped with a series-connected speed sensor for moving the lifting vessel and ferentsiruyuschim unit output connected to the third input of the adder. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2687296/11, cl. B 66 B 5/12, 17.11.78. To SHPP