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Supply of rolling mill pressing device to press down nuts and screws

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  • Time of issue:2020-07-01
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(Summary description)The reduction device of the rolling mill is one of the important structures of the rolling mill, used to adjust the roll gap, also called the roll gap adjustment device. The pressing screw is composed of three parts: the contact end with the roll chock is called the head;

Supply of rolling mill pressing device to press down nuts and screws

(Summary description)The reduction device of the rolling mill is one of the important structures of the rolling mill, used to adjust the roll gap, also called the roll gap adjustment device. The pressing screw is composed of three parts: the contact end with the roll chock is called the head;

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2020-07-01
  • Views:0
Information

The reduction device of the rolling mill is one of the important structures of the rolling mill, used to adjust the roll gap, also called the roll gap adjustment device. The pressing screw is composed of three parts: the contact end with the roll chock is called the head; the threaded part in the middle is called the body; the screw drive end is called the tail when the nut is pressed down, which bears the driving torque from the pressing motor. The pressing nut is installed on the end face of the hole towel of the mill housing and is positioned with a pressing plate to prevent rotation during work. The threaded part of the screw body is matched with the internal thread of the nut, and the roll gap adjustment is completed by the rotation of the screw.

The cross-sectional shape of the tail of the screw is square and spline. The square structure with a replaceable blue steel slide plate is mainly used for fast pressing devices; the spline structure is mainly used for slow pressing devices with heavy loads. .

The thread of the screw body part of the screw has two types: zigzag and trapezoid. The former has higher transmission efficiency and is mostly used for rapid reduction devices such as rough rolling mills; the latter has higher thread strength and is mostly used for cold rolling with larger rolling forces. The pressing device of the plate and strip rolling mill. Most of the pressing screws use single-thread (single-head) threads. Only double-thread (double-head) or multi-thread threads are used in fast electric pressing devices such as roughing mills. The head of the pressed screw is generally made into a spherical shape, and contacts with the spherical copper pad to form a thrust bearing. The spherical shape facilitates the automatic adjustment of the roll chock.

The threaded working surface of the screw and nut is under great pressure. In order to reduce the friction loss on the thread working surface when the screw is rotated, the screw is generally made of alloy forged steel, and the nut is made of high-strength bronze (ZQA-19-4) or brass (ZHAL66-6-3- 2) and other materials.

In addition to satisfying the stress conditions, the reasonable structure of the pressed nut should also consider saving non-ferrous metals. From this point of view, the structure of the screw nut has an integral type and a combined type. In the large rolling mill reduction device, because the weight of the pressed nut is relatively large, in order to save non-ferrous metals, a combined structure is often used. For modular nuts, in the process of manufacturing and installation, the integrity of the insert sleeve and the copper nut must be guaranteed. At the same time, the two materials should have similar elastic moduli.

Shandong Zhengxiang Industrial and Mine is a manufacturer with many years of experience in copper casting production and sales. The company specializes in the production of various specifications and models of copper-based alloy parts, zinc-based alloy parts and aluminum alloy parts. Specializing in the production of rolling mill press nuts, it also produces copper sleeves, copper tiles, universal joint shaft sliders, concave spherical blocks, reducer worm gears and other accessories. If necessary, welcome to order.

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