A reversing rotary valve for controlling hydraulic double-return and double-feeding of cold-rolled pipe mill

Abstract

The invention discloses a reversing rotational valve for controlling hydraulic dual rotation and dual feeding of a cold pipe mill. The reversing rotational valve comprises a valve body, a valve core, a rotary motor, a rotary motor oil-inlet check valve, a back rotary regulator, a back rotary regulator oil-return check valve, a feeding motor, a feeding motor oil-inlet check valve, a back feeding regulator, a back feeding regulator oil-return check valve, a hydraulic system unloading check valve, a stop valve, a front feeding regulator oil-return check valve, a front feeding regulator, a front rotary regulator oil-return check valve, a front rotary regulator and a hydraulic pipe fitting. The reversing rotational valve is simple in structural parameter design calculation, intuitive, clear, compact in structure, simple and convenient in transmission, good in control function, stable in performance, convenient to assemble and adjust, small in size and layout area and light in weight.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of a hydraulic double-rotation and double-feeding mechanism for a cold-rolled pipe mill, and in particular relates to a reversing rotary valve for controlling the hydraulic double-return and double-feeding mechanism of a cold-rolled pipe mill. Background technique [0002] At present, with the continuous expansion of the application field of cold-rolled seamless pipes at home and abroad, the demand for cold-rolled seamless pipes is also increasing. Increase. According to the number of rolls, the cold rolling mill can be divided into two types: two-roller and multi-roller (three-roller, five-roller); according to the rotary feeding method, it can be divided into three types: single-return single-feed, double-return single-feed and double-return double-feed. Multi-roll mills generally only use single-pass and single-feed, while two-roll mills can use the above three rolling methods. ...

AI Technical Summary

Problems solved by technology

The rolling method of double rotation and double feed can effectively improve the productivity of the cold rolling mill, while the traditional hydraulic control mechanism can only be used for "single return and single feed".

In recent years, the hydraulic control mechanism for "double rotation and double (single) feeding" just developed in recent years, although the control principle is novel and the transmission structure is reasonable, the main shortcomings of the feedback after the actual application of relevant enterprises are: the "crank slide The structure of the "valve control mechanism" is relatively complex, the volume and layout area are large, the manufacturing (processing, assembly, debugging, etc.) is troublesome, the control performance is not stable enough, and the production cost is high

[0006] The main deficiencies of the existing technology after the actual application of relevant enterprises are: the adopted "crank spool valve control mechanism" has a complex structure, large volume and layout area, troublesome manufacturing (processing, assembly, debugging, etc.), and the control The performance is not stable enough and the production cost is high

[0008] 1) Since the three-position three-way stroke reversing slide valve is used for control, a crank transmission mechanism must be added to convert the synchronous rotational motion from the rolling mill head into reciprocating motion, so there are more transmission mechanisms;

[0009] 2) Due to the use of two sets of slide valve devices, the number of parts is large (mainly five valve blocks, two valve cores and crank transmission mechanism), the volume and layout area are large, and the materials and total weight used are relatively large ;

[0010] 3) The overall structure and transmission are more complex, the processing of the overall crank shaft and the inner cavity of each valve block is more troublesome, and the assembly and adjustment of the device are inconvenient, the design and calculation of stroke parameters are cumbersome, the control performance is not stable enough, and the production cost is high

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