Limit speed (shaft conveyance)

When speed limit is referred to in the shaft hoisting equipment the speed to which a goods support can be maximally accelerated so that standing still available depth sufficient for the goods support from the carrier at the end stop ( pit bank , fill location ) can easily be brought to a stop. The limit speed is always dependent on the available depth of the respective shaft .

The driving process

In the case of a shaft conveyor system, the vertical movement of the goods carrier is always based on the same principle. The hoisting rope is accelerated by the rope carrier up to the respective conveying speed . The hoisting rope is then driven at a constant speed. At a certain point, the hoisting rope is then decelerated by the rope carrier and braked to zero. The respective movement (acceleration, synchronism, deceleration) of the conveyor rope is transferred to the carrier. After the pause in delivery , the movement takes place in the opposite direction. A certain part of the depth is available to the funds for the individual movement periods. These periods of movement can be shown in a travel diagram. The distance that the conveyor covers during the individual movement periods can be calculated. The maximum speed of the respective shaft hoisting system can also be determined.

Acceleration up to the limit speed

If the carrier operator now accelerates the carrier machine beyond the determined maximum speed, the distance that is required for the acceleration becomes longer. At the same time, the delay distance is also extended. In return, the distance that the conveying means is moved at a constant speed is reduced. The speed can be increased until there is no longer any synchronism component and the conveyor is only accelerated or decelerated. The speed that is reached as the maximum speed is the limit speed. This limit speed must not be exceeded, since the remaining depth available would then not be sufficient to bring the conveyor to a stop at the end stop. The goods carrier would exaggerate and would only be brought to a standstill by the anti- excess device.

Individual evidence

^ ^A ^b ^c ^d ^e Carl Hellmut Fritzsche: Textbook of mining science. First volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1961, pp. 468–471.
^ ^A ^b Fritz Schmidt: The basics of the conveying machine system. Second increased and improved edition, Springer-Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1923, pp. 24–35.
^ ^A ^b E. G. Weyhausen, P. Mettgenberg: Calculation of electrical conveyor systems. Julius Springer's publishing house, Berlin 1920, pp. 1–18.
↑ Hans Bansen (ed.): The mining machines . Third Volume, The Shaft Carriers. Published by Julius Springer, Berlin 1913, pp. 76–84.
↑ ^a ^b Fritz Süchting: Tasks from machine technology and electrical engineering . Published by Julius Springer, Berlin 1924, pp. 27, 122–124.
↑ ^a ^b P. Walter: Determination of the payload in the shaft conveyance, in particular the vessel conveyance. In: Glückauf, Berg- und Hüttenmännische magazine. Association for mining interests in the Oberbergamtsiertel Dortmund (Ed.), No. 16, 67th year, April 18, 1931, pp. 513-523.
↑ Alois Riman, Friedrich Lockert: Project planning and rationalization of coal mines . Springer Verlag Wien GmbH, Vienna 1962, pp. 222-226.
↑ Wilhelm Breucker, Ernst Ulrich: Better protection in the event of overdoing in a shaft hoisting system. In: The WBK rope testing center provides information. WBL-Seilprüfstelle (Ed.), No. I, 11, July 1988.

Remarks

↑ The start-up acceleration for larger drum hoists is between 1 and 1.2 m / s ² . Smaller drum winding machines can also be accelerated up to 1.5 m / s ² . Traction sheave hoisting machines may only be accelerated at 1 m / s ² , otherwise a rope slip can occur. (Source: Hans Bansen (Ed.): The shaft hoisting machines. )

[Quelle_1-1] A ^b ^c ^d ^e Carl Hellmut Fritzsche: Textbook of mining science. First volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1961, pp. 468–471.

[Quelle_2-2] A ^b Fritz Schmidt: The basics of the conveying machine system. Second increased and improved edition, Springer-Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1923, pp. 24–35.

[Quelle_3-3] A ^b E. G. Weyhausen, P. Mettgenberg: Calculation of electrical conveyor systems. Julius Springer's publishing house, Berlin 1920, pp. 1–18.

[Quelle_4-4] Hans Bansen (ed.): The mining machines . Third Volume, The Shaft Carriers. Published by Julius Springer, Berlin 1913, pp. 76–84.

[Quelle_5-5] Fritz Süchting: Tasks from machine technology and electrical engineering . Published by Julius Springer, Berlin 1924, pp. 27, 122–124.

[Quelle_6-6] P. Walter: Determination of the payload in the shaft conveyance, in particular the vessel conveyance. In: Glückauf, Berg- und Hüttenmännische magazine. Association for mining interests in the Oberbergamtsiertel Dortmund (Ed.), No. 16, 67th year, April 18, 1931, pp. 513-523.

[Quelle_8-8] Alois Riman, Friedrich Lockert: Project planning and rationalization of coal mines . Springer Verlag Wien GmbH, Vienna 1962, pp. 222-226.

[Quelle_7-9] Wilhelm Breucker, Ernst Ulrich: Better protection in the event of overdoing in a shaft hoisting system. In: The WBK rope testing center provides information. WBL-Seilprüfstelle (Ed.), No. I, 11, July 1988.

[Anm._Bans.-7] The start-up acceleration for larger drum hoists is between 1 and 1.2 m / s ² . Smaller drum winding machines can also be accelerated up to 1.5 m / s ² . Traction sheave hoisting machines may only be accelerated at 1 m / s ² , otherwise a rope slip can occur. (Source: Hans Bansen (Ed.): The shaft hoisting machines. )