JPH021353Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] The present invention relates to a main rope slip detection device for a hoisting machine.

[Technical background of the invention and its problems] A conventional shaft hoisting machine consists of a carrier, a counterweight, a main rope, a balancing rope, a winding drum, a main pulley, and a drive motor. The (rope slip) detection device adds a small auxiliary pulley (guide sheave), attaches a tachometer generator to it, and connects the signal of the tachometer generator attached to the winding drum shaft with an amplifier for each standard adjustment. If the difference is larger than a set value in the comparison circuit, it is determined that the main rope is slipping.

However, since it is essentially a mechanical monitoring device, it is not highly reliable and, for example, a malfunction due to a bearing failure in an auxiliary pulley may cause an alarm to be issued and the hoisting machine to stop unnecessarily.

[Purpose of the invention] The object of the invention is to provide a highly reliable main rope slippage detection device that electrically detects main rope slippage using only the items originally necessary for controlling the shaft hoisting machine without adding as many mechanical parts as possible. It is an object.

That is, the purpose of the present invention is to count the total number of rotations of the winding drum during one trip (trip) in a Cape type shaft hoisting machine, and calculate the effective diameter that changes due to lining wear of the main cable groove at each step. The value is memorized and the next effective diameter is estimated from the data of the past several processes, and if the calculated value of the effective diameter actually obtained differs by more than the allowable margin of error, the rope slips. An object of the present invention is to provide a main cable slippage detection device for a hoisting machine that determines that the main rope is slipping.

[Summary of the invention] This invention is based on the Koepe type shaft hoisting machine, which is operated during one trip (a type of shaft hoisting drum) during the operation process from the mine entrance to the bottom or from the bottom to the pit mouth. The total number of rotations of the winding drum is counted at each step, and the effective diameter of the winding drum, which changes due to the wear of the lining of the rope groove, is calculated at each step, and the value is memorized.The next effective diameter of the winding drum is estimated from the information of the past few steps, and the actual diameter is calculated. This is a main rope slip detection device for a hoisting machine that determines that the main rope has slipped and issues an alarm when the calculated value of the effective diameter obtained during the test falls below the predicted value tolerance range.

[Example of the invention] Next, an example of the invention will be described. The drawing shows a main cable slippage detection device for a hoisting machine, which includes the following components.

(a) A main rope 3 that suspends the carrier 1 and the carrier 1 and the balance weight 2 via a pulley 6 and raises and lowers it.

(b) A cape 5 that winds up or lowers the main rope 3.

(c) A drive motor 7 that rotationally drives the cape 5.

(d) A rotational speed generator 8 connected to the cape 5 and transmitting the rotational speed.

(E) A counting circuit 9 that counts the rotational speed signal 8a from the rotational speed generator 8.

(F) The number of revolutions 9a counted by the counting circuit 9 is
A Kape diameter calculation circuit 10 that calculates a Kape diameter by multiplying the diameter of the Kape diameter.

(g) Cape diameter 1 calculated by Cape diameter calculation circuit 10
A memory circuit 11 that stores 0a.

(H) A Kape diameter estimation calculation circuit 12 that calculates the slope of Kape diameter decrease based on the Kape diameter stored in the storage circuit 11 and estimates the Kape diameter.

(li) Comparison that compares the Cape diameter estimate 12a calculated by the Cape diameter estimated value calculation circuit 12 and the Cape diameter 10a calculated by the Cape diameter calculation circuit 10, and outputs a signal when the value becomes larger than a preset value. Circuit 13.

That is, in order to count the total number of revolutions N of the cape 5, the signal from the number of revolutions generator 8 for speed control is sent to the counting circuit 9.
I can put it in. In the Kape diameter calculation circuit 10, from the output N (rps) of the counting circuit 9, the preset pi, and the hoisting distance of 1 trip L (m), the Kape diameter D (m) = L/Nπ Calculate. This calculated value is stored in the memory circuit. The Cape diameter estimated value calculation circuit 12 calculates the slope of the decrease in the Cape diameter from the Cape diameter calculation values of the past several trips stored in the memory circuit 11, and predicts the current Cape diameter. The comparator circuit 13 compares the calculated diameter value with the rope slip, and if the difference is larger than a predetermined tolerance, it is determined that rope slip has occurred and a warning is issued.

Normally, the amount of wear on the lining of a rope groove does not suddenly increase, so a sudden decrease in the Kape effective diameter due to a sudden increase in rotational speed can be determined to be a rope slip, and this method is effective in detecting rope slip.

If a rope slip alarm is issued, check to see if there are any abnormalities in the rope groove or rope, or if the carrier is overloaded, and check to see if there are any abnormalities in the speed or current during operation using a hoisting machine operation recorder, etc. Confirmed,
If any abnormality is found, check the control circuit.

[Effects of the invention] As described above, according to the invention, a highly reliable main cable slippage detection device can be realized in a Cape type shaft hoisting machine.

Furthermore, by monitoring the average value of the Kape diameter calculations for consecutive trips, it is also possible to detect when the amount of wear on the lining of the rope groove has reached its limit.

[Brief explanation of the drawing]

The drawing is a configuration diagram of a rope slip detection device showing an embodiment of the present invention. 5...Cape, 8...Rotation speed generator, 9...Counting circuit, 10...Cape diameter calculation circuit, 11...Storage circuit, 12...Cape diameter estimated value calculation circuit, 13
...Comparison circuit.

Claims (1)

[Claims for Utility Model Registration] A main cable slippage detection device for a hoisting machine, comprising the following components. (a) A main rope that lifts and lowers a carrier and a balance weight balanced with the carrier via a pulley. (b) A winding drum that winds up or lowers this main rope. (c) A drive motor that rotates this winding drum. (d) A rotational speed generator connected to the winding drum and transmitting the rotational speed. (E) A counting circuit that counts the rotation speed signal from this rotation speed generator. (F) A cape diameter calculation circuit that calculates a cape diameter by multiplying the number of rotations counted by this counting circuit by the diameter of the winding drum. (g) A memory circuit that stores the Kape diameter calculated by this Kape diameter calculator circuit. (H) A Kape diameter estimated value calculation circuit that calculates the slope of Kape diameter decrease based on the Kape diameter stored in this memory circuit and estimates the Kape diameter. (li) A comparison circuit that compares the estimated Kape diameter calculated by this Kape diameter estimated value calculation circuit and the Kape diameter calculated by the Kape diameter calculation circuit, and outputs a signal when the Kape diameter becomes larger than a preset value.