SU51832A1 - Installation for continuous heat treatment of drill pipes - Google Patents

Description

Typically, heat treatment (quenching) of tubular products is performed exclusively in an upright position. For this, if the processing is subjected to pipes of relatively small diameter, they are collected into packages, which are loaded into vertical (shaft) furnaces for heating. Upon reaching the required temperature, the bags are removed from the furnace and immersed in a quenching tank located above it. With massive pipes, each of them is individually heated, followed by immersion in a tank, which is then adjacent to the furnace. In this method, only tubes of small length can be heat treated. Drilling pipes, having a great length with a relatively thin wall, cannot be hardened in this way since it is impossible to obtain a uniform heating of the pipe in height and for a number of other reasons of technical, operational and similar order.

In the proposed installation for the heat treatment of drill pipes, consisting of successive heating furnace, quenching apparatus and tempering furnace, the horizontal method of pipe quenching was applied. For this purpose, the installation is equipped with a device for moving the pipe in a horizontal position from one unit to another, consisting of two pairs of hyperbolic rolls, which give a rotational-translational (helical) motion to the pipe as it moves. In addition, the installation includes a specially designed quenching apparatus, characterized in that the supply of water and air is tangential to the pipe moved along the apparatus.

In FIG. 1 shows a device for imparting a screw movement to a pipe in a front view; FIG. 2- Also in the top view; FIG. 3 shows an axial section of the quenching apparatus; FIG. 4 is the same in cross section; FIG. 5-general view of the installation; FIG. A b-axial incision of the stopper for closing the pipe.

The pipe, heated in a quenching furnace 7 (Fig. 5), reaches the quenching temperature through window 2, from where it is directed by roller 3 to the first pair of hyperbolic rolls 4, described below.

can easily be installed at the desired height.

The subject matter of the invention.

Claims (2)

1. Installation for continuous heat treatment of drill pipes, consisting of consecutive heating furnace, quenching apparatus and tempering furnace, characterized in that, in order to straighten the heated pipes and their movement, two pairs of hyperololic rollers 4 are used, rotating synchronously . 2. The embodiment of the quenching apparatus in the installation according to claim 1, characterized in that it is equipped to supply water and air tangentially to the pipe with two annular rows of nozzles displaced one relative to the other by an angle and annular nozzles. 2 jff. when rotating the pipe. When switching from one pipe diameter to another, the ruler 34 may be lowered or raised on the brace 36. The quenching apparatus 6 (Figs. 3 and 4) consists of five working sections c, c, c, c, c and one auxiliary d. Each of the working sections is an iron drum 37 equipped with two annular rows of nozzles 38 In each row eight nozzles are equally spaced from each other, with one row shifted relative to the other by 22-30. For feeding nozzles each section has each with a single 39 and an air annular collector 40, connected to the corresponding mains 4J and 42 (Fig. 4). Each line has its own common shut-off valve 43. The annular manifolds also have their own adjusting valves 44 and 45. In addition, each nozzle has its own valve 46 to evenly adjust the water flow through the ring. The nozzles were connected to the mains through a tee 47 with a flexible rubber hose 48. To eliminate spraying, each nozzle is equipped with a plug 49 welded into the body of section 37. A rubber diaphragm 57 with a narrowed nozzle hole is clamped into the nozzle provided with a ring 50. The end of the nozzle inserted into it engages with tension, giving a seal regardless of the angle of inclination of the nozzle. Here, each of the nozzles has an articulated holder 52 which allows the nozzle jet to be adjusted as required. The simplest position of the nozzles should be considered the position when the water jets are located in a vertical plane and directed towards the center of the section. More complicated is the tangential direction of the water jet shown in the drawing. If in the first case the quenched pipe receives a direct blow, in the second case it slides along the tangent to the pipe. In addition, due to the tangential direction of the jet, a rotational moment is formed, and the quenching medium takes the form of an air ring vortex saturated with water. In addition to nozzles 38, for two-sided quenching of the pipe, as well as with the requirement of increased quenching rigidity, the working sections f: are equipped with nozzles 55. They are two truncated cones inserted one into the other in such a way that an annular gap is formed at the vertices. The size of this slot can be adjusted by a bronze ring 54. Water is fed into the hollow space of the nozzles through pipes 55. Each of the nozzles has its own supply and valve 56. As can be seen from the drawing, the nozzles are mounted on iron diaphragms 57, sandwiched between the flanges of the sections 37. At the same time, some of the nozzles are facing along the movement of the hardened pipe and part against. This is intended to create equal conditions for quenching both ends of the pipe. Since quenching produces a large amount of waste media: water, steam, and air, each section has its own exhaust pipe 58, which is led out into a common drainage channel. In order to observe the action of the sections in each branch 58 there is a door 59. In addition to the nozzles, the sections are provided with an inlet funnel 60 and wiring b /. The auxiliary section d is made solely for the possibility of mounting roller 62. Without this roller, due to the large console when the pipe is pushed only on the input roller 63, the pipe gives, not income to the output roller 64, the deflection. The power of the quenching apparatus 6 can be supplied from a normal water supply network or, for the constancy of the temperature of the quenching medium and the easy possibility of its adjustment, it can be produced from special tanks. When moving from one diameter of the quenched pipe to another, the quenching apparatus is raised or lowered on four screws 65 that have been passed through the nuts 66. The nuts are fixed and fixed on the common frame 67 of the quenching apparatus. The screw heads rest loosely on the cups 68 welded to the brackets 69 of the frontal shaped sheets 7i9. Thus, rotated 1-1 screws 65 to the author's testimony of V. M, Trubitsyna 51832 Hip „Printed Labor-. Zak No. 6101-500 to the author's testimony of V. M. Trubitsyn No. 51832