Mixed jet descaling device axially and eccentrically arranged for inner wall of pipe

Abstract

A mixed jet descaling device axially and eccentrically arranged for the inner wall of a metal pipe comprises a support rod (1) arranged inside the metal pipe (100), the support rod being parallel to the central axis of the metal pipe, eccentrically arranged and not concentric with the central axis of the metal pipe; and at least two spray nozzle units (2, 2, 2) for spraying the mixed jet, the spray nozzle units being arranged from front to back along the length direction of the support rod. At least two mixed jet spray nozzles (21, 21, 21) are provided in each spray nozzle unit and uniformly arranged along the circumference of the support rod in such a manner that the mixed jet spray nozzles diverge towards periphery of the support rod with the axis of the support rod as the center. The mixed jet spray nozzles of the spray nozzle units arranged from front to back are staggered from front to back in the circumferential direction of the inner wall of the to-be-descaled metal pipe, thereby forming a mixed jet spray nozzle matrix and creating an effective descaling zone capable of completely covering the circumferential surface of the inner wall of the metal pipe. The descaling device can achieve continuous, high efficient, stable and environment-friendly descaling for the inner wall surfaces of cold-state metal pipes.

Claims

1. A mixed jet descaling device for descaling an inner wall of a metal pipe, said mixed jet descaling device comprising: a support rod configured to be used inside the metal pipe, wherein said support rod comprises a single tortuous rod having a first support portion and a second support portion extending from an end of the first support portion by bending the support rod spatially, wherein each axis of the first and second support portions are parallel and eccentric relative to a central axis of the support rod; at least two spray nozzle units are fixed on the support rod, each spray nozzle unit comprising at least two jet spray nozzles configured to spray a mixed abrasive medium to remove metal oxide scales formed on the inner wall of the metal pipe during hot rolling or heat treatment, wherein the spray nozzle units are mounted on each of the first and second support portions of the support rod along a lengthwise direction thereof in axially eccentric positions relative to the central axis, and an angle is formed between an axial direction of the jet spray nozzles and the central axis of the support rod, wherein each jet spray nozzle is oriented at a non-perpendicular angle relative to the respective axis of the first or second support portion on which each spray nozzle is mounted, the jet spray nozzles are configured in a diverging manner with the respective axis of the first and second support portions as a respective center; and wherein the mixed jet descaling device is arranged inside the metal pipe without being in contact with the metal pipe, wherein the jet spray nozzles form a matrix of mixed abrasive medium, wherein said matrix provides a descaling zone capable of covering a circumferential surface of the inner wall of the metal pipe, and wherein a straight relative movement between the jet spray nozzles and the metal pipe remove the metal oxide scales formed on the inner wall of the metal pipe.

2. The mixed jet descaling device of claim 1, wherein the second support portion of the support rod extends from the end of the first support portion by bending twice spatially.

3. The mixed jet descaling device of claim 1, wherein in a projection plane perpendicular to the central axis of the support rod in the metal pipe, the axes of the first and second support portions are both configured on a concentric circle with the central axis of the support rod as the center, and are configured on the concentric circle in an angularly staggered manner.

4. The mixed jet descaling device of claim 1, wherein the support rod further comprises a third support portion which is used for arranging the spray nozzle units, said third support portion extends in the lengthwise direction from an end of the second support portion by bending the support rod spatially, and an axis of the third support portion is eccentric relative to the central axis of the support rod.

5. The mixed jet descaling device of claim 4, wherein the third support portion of the support rod extends from the end of the second support portion of the support rod by bending the support rod twice spatially, and wherein the third support portion is parallel to the second support portion of the support rod.

6. The mixed jet descaling device of claim 4, wherein in a projection plane perpendicular to the central axis of the support rod in the metal pipe, the axes of the first, second and third support portions are all arranged on a concentric circle with the central axis of the support rod as the center, and are configured on the concentric circle in an angularly staggered manner.

7. A descaling system for descaling an inner wall of a metal pipe, comprising: a metal pipe having an inner wall; and the mixed jet descaling device of claim 1; wherein the mixed jet descaling device is arranged inside the metal pipe to descale metal oxide formed on the inner wall of the metal pipe.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a structural schematic view of a first embodiment of the present invention.

(2) FIG. 2 is a side view of FIG. 1.

(3) FIG. 3 is a sectional view taken through A-A of FIG. 1.

(4) FIG. 4 is a sectional view taken through B-B of FIG. 1.

(5) FIG. 5 is a sectional view taken through C-C of FIG. 1.

(6) FIG. 6 is a structural schematic view of a second embodiment of the present invention.

(7) FIG. 7 is a side view of FIG. 6.

(8) FIG. 8 is a structural schematic view of a support rod in the second embodiment of the present invention.

(9) FIG. 9 is a sectional view taken through D-D of FIG. 6.

(10) FIG. 10 is a sectional view taken through E-E of FIG. 6.

(11) FIG. 11 is a sectional view taken through F-F of FIG. 6.

PREFERRED EMBODIMENTS OF THE INVENTION

(12) Referring to FIGS. 1-5, an axially eccentrically arranged mixed jet descaling device for an inner wall of a metal pipe of the present invention comprises a support rod 1 arranged inside the metal pipe 100 to be descaled, the support rod being parallel to the central axis of the metal pipe 100, eccentrically arranged and not concentric with the central axis of the metal pipe; and three spray nozzle units 2, 2, 2 for spraying a mixed jet, the spray nozzle units being arranged one behind another along the lengthwise direction of the support rod, wherein at least two mixed jet spray nozzles 21, 21, 21 are provided in each spray nozzle unit 2, 2, 2 and uniformly arranged along the circumference of the support rod 1 in such a manner that the mixed jet spray nozzles diverge towards the periphery of the support rod with the axis of the support rod 1 as the center; and the mixed jet spray nozzles of the spray nozzle units 2, 2, 2 arranged one behind another are staggered one behind another in the circumferential direction of the inner wall of the metal pipe to be descaled, thereby forming a mixed jet spray nozzle matrix and creating an effective descaling zone capable of covering the circumferential surface of the inner wall of the metal pipe. A larger spacing and a smaller spacing exist between the support rod 1 and the inner wall of the metal pipe 100, the greater spacing is larger than the smaller spacing, i.e., as shown in the figures, the spacing between the upper inner wall and the support rod is the larger spacing and the spacing between the lower inner wall and the support rod is the smaller spacing, the upper inner wall and the lower inner wall are divided by a horizontal line of the support rod, and the mixed jet spray nozzles 21, 21, 21 are arranged on the side of the support rod having the larger spacing between the support rod 1 and the inner wall 100.

(13) Referring to FIGS. 6-11, which show the second embodiment of the present invention, the support rod 1 comprises a first support portion 11, a second support portion 12 which extends from the end of the first support portion 11 by bending twice spatially and is parallel to the first support portion 11, and a third support portion 13 which extends from the end of the second support portion 12 by bending twice spatially and is parallel to the second support portion 12, axes of the first to third support portions 11-13 are all arranged eccentrically with identical eccentric values, and the axes are arranged in an angularly staggered manner on a circumference with the central axis of the metal pipe 100 as the center; and the mixed jet spray nozzles in the spray nozzle units 2, 2, 2 on the first to third support portions 11-13 are arranged to be staggered one behind another in the circumferential direction of the inner wall of the metal pipe to be descaled, thereby forming a mixed jet spray nozzle matrix and creating a circular effective descaling zone capable of covering the circumferential surface of the inner wall of the metal pipe 100.

(14) In addition, the axes of the first to third support portions 11-13 are all arranged on the circumference of a concentric circle with the central axis of the metal pipe 100 as the center, and uniformly arranged on the circumference in an angularly staggered manner.

(15) Furthermore, an angle is formed between the axial direction of the mixed jet spray nozzle and the central axis of the support rod.

(16) The spray nozzle units of the present invention are all fixed on an eccentric tortuous support rod, and the mixed jet spray nozzles in each spray nozzle unit are arranged in a diverging manner in accordance with the respective center, namely, the mixed jet is formed in a diverging manner; and the mixed jet spray nozzles in each spray nozzle unit are uniformly arranged in the circumferential direction of a circular cross section of the pipe in a typically eccentrically diverging form, the values of staggered angles between every two spray nozzles in the same spray nozzle unit in the circumferential direction of the cross section are the same, namely when three spray nozzle units overlap, it can be seen from the view in the overlapping direction that the values of staggered angles between every two adjacent spray nozzles in the circumferential direction of the cross section are the same after the three individual spray nozzles overlap.

(17) In this way, when the pipe moves straight in the axial direction, and all the spray nozzle units are spraying and remain stationary, the scales of the inner wall of the pipe are completely removed after the inner wall of the pipe completely pass through all the spray nozzle units.

(18) The present invention takes full advantage of the mixed jet descaling effect and the cross section properties of the pipe, and uses this high-pressure jet method to achieve high-speed continuous descaling for the pipe.