Improved cutting torch structure for continuous casting blank cutting

Abstract

The utility model discloses an improved cutting torch structure for cutting a continuous casting blank, which comprises a cutting torch main body, and an oxygen channel penetrating through the middle of the cutting torch main body is formed along the axis of the cutting torch main body; a mixed gas inlet channel is formed in the portion, close to the upper end, of the cutting torch body from the outer side of the cutting torch body, the mixed gas inlet channel comprises gas inlet holes formed in the circumferential wall of the cutting torch body, and the inner ends of the gas inlet holes communicate with a gas inlet cavity which is formed in the cutting torch body and provided with an annular section. A plurality of mixed gas outlet channels are evenly formed in the bottom of the gas inlet cavity in the circumferential direction, each mixed gas outlet channel comprises a taper hole section, a gas mixing section and a gas outlet section which are sequentially communicated from top to bottom, a spiral gas guide piece is fixedly arranged on the inner circumferential wall of each mixed gas outlet channel, and two sets of opposite refraction plates are arranged in each gas mixing section in a staggered mode. According to the utility model, mixed gas can be uniformly mixed in a gas mixing section with a short path and a small space, the flame effect formed by subsequent combustion is ensured, and the cutting quality of a continuous casting billet is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flame cutting of continuous casting billets, in particular to an improved cutting nozzle structure for cutting continuous casting billets. Background Art

[0002] In the process of cutting continuous casting billets, a flame cutter is required for cutting. The cutting nozzle is an important part of the flame cutter. It can achieve a smooth cutting surface and a fast cutting speed for cutting steel, without biting, burning, slag, carbon increase and hardening. The main principle of the cutting nozzle is to supply oxygen and a mixed gas with a combustion medium (such as liquefied gas, propane gas, propylene gas) to the inside of the cutting nozzle through the corresponding pipeline. After the oxygen and the preheated mixed gas are burned, a high-temperature jet flame is formed for cutting. At present, the cutting nozzle has a poor mixing effect on the preheated mixed gas, resulting in insufficient mixing of the mixed gas, affecting the combustion effect of the mixed gas, and thus affecting the cutting effect of the cutting nozzle on the continuous casting billet. Therefore, an improved cutting nozzle structure for continuous casting billet cutting is developed. Utility Model Content

[0003] The utility model aims to provide an improved cutting nozzle structure for cutting continuous casting billets, so as to solve the technical problems mentioned in the above background technology.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model discloses an improved cutting nozzle structure for cutting continuous casting billet, comprising a cutting nozzle body, wherein the cutting nozzle body is provided with an oxygen passage running through the middle thereof along its axis; a mixed gas inlet passage is provided from the outer side of the cutting nozzle body at a portion close to the upper end thereof, wherein the mixed gas inlet passage comprises an inlet hole provided on the peripheral wall of the cutting nozzle body, wherein the inner end of the inlet hole is communicated with an inlet cavity provided inside the cutting nozzle body and having a ring-shaped cross section; a plurality of mixed gas outlet passages are uniformly provided along the circumferential direction at the bottom of the inlet cavity, wherein each of the mixed gas outlet passages comprises a tapered hole section, a mixing section and an outlet section which are connected in sequence from top to bottom, wherein the inner diameter of the tapered hole section gradually decreases from top to bottom, and a spiral air guide sheet is fixedly provided on the inner peripheral wall, wherein two groups of opposite refraction plates are staggeredly provided inside the mixing section, wherein the refraction plates of each group are arranged to be inclined upward along the axial direction close to the mixing section, and the outlet section extends to the bottom of the cutting nozzle body.

[0006] Furthermore, the cutting nozzle body is provided with a first connector outside the upper end of the oxygen channel, and a second connector is provided outside the air inlet, and both the first connector and the second connector are provided with external threads.

[0007] Furthermore, the lower half of the oxygen channel is configured as a tapered hole structure that gradually narrows from top to bottom.

[0008] Furthermore, each of the gas outlet sections is arranged to be inclined toward the direction close to the oxygen channel, and the inner diameter gradually decreases from top to bottom.

[0009] Compared with the prior art, the beneficial technical effects of the utility model are:

[0010] The utility model introduces mixed gas into the nozzle from the air inlet hole and the air inlet cavity firstly passes through the tapered hole section. As the inner diameter of the tapered hole section gradually narrows and a spiral air guide sheet is provided, the mixed gas flowing through forms a vortex with a certain pressure and enters the gas mixing section. In the process of the mixed gas flowing downward in the gas mixing section, the mixed gas continuously hits two groups of refraction plates arranged relatively staggered, and then turns back in the opposite direction, continuously increasing the disturbance of the mixed gas in the flow process, so that the mixed gas can be evenly mixed in the gas mixing section with a short path and a small space, thereby ensuring the flame effect formed by subsequent combustion, which is beneficial to ensuring the cutting quality of the continuous casting billet. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model will be further described below in conjunction with the accompanying drawings.

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0014] Explanation of the accompanying drawings: 1. cutting nozzle body; 2. oxygen channel; 3. mixed gas inlet channel; 3-1. air inlet hole; 3-2. air inlet cavity; 4. mixed gas outlet channel; 4-1. cone hole section; 4-2. gas mixing section; 4-3. air outlet section; 4-4. air guide sheet; 4-5. refraction plate; 5. first connector; 6. second connector. DETAILED DESCRIPTION

[0015] like Figure 1-Figure 2 As shown, an improved cutting nozzle structure for cutting continuous casting billets comprises a cutting nozzle body 1, wherein the cutting nozzle body 1 is provided with an oxygen passage 2 running through the middle thereof along its axis.

[0016] A mixed gas intake passage 3 is provided from the outer side of the cutting nozzle body 1 near the upper end thereof. The mixed gas intake passage 3 includes an intake hole 3-1 provided on the peripheral wall of the cutting nozzle body 1. The inner end of the intake hole 3-1 is connected to an intake cavity 3-2 which is provided inside the cutting nozzle body 1 and has a circular cross section.

[0017] The bottom of the air inlet cavity 3-2 is uniformly provided with a plurality of mixed gas outlet channels 4 along the circumferential direction, and each of the mixed gas outlet channels 4 includes a conical hole section 4-1, a gas mixing section 4-2 and a gas outlet section 4-3 which are sequentially connected from top to bottom. The inner diameter of the conical hole section 4-1 gradually decreases from top to bottom, and a spiral air guide sheet 4-4 is fixedly provided on the inner peripheral wall. Two groups of opposite refraction plates 4-5 are staggered inside the gas mixing section 4-2, and each group of the refraction plates 4-5 is tilted upward along the axial direction close to the gas mixing section 4-2. The gas outlet section 4-3 extends to the bottom of the cutting nozzle body 1.

[0018] The cutting nozzle body 1 is provided with a first connector 5 on the outside of the upper end of the oxygen channel 2, and a second connector 6 on the outside of the air inlet 3-1. The first connector 5 and the second connector 6 are both provided with external threads, so as to connect the joints of the external oxygen supply pipeline and the mixed gas supply pipeline respectively through threaded connection.

[0019] The utility model introduces mixed gas into the nozzle from the air inlet hole and the air inlet cavity firstly passes through the tapered hole section. As the inner diameter of the tapered hole section gradually narrows and a spiral air guide sheet is provided, the mixed gas flowing through forms a vortex with a certain pressure and enters the gas mixing section. In the process of the mixed gas flowing downward in the gas mixing section, the mixed gas continuously hits two groups of refraction plates arranged relatively staggered, and then turns back in the opposite direction, continuously increasing the disturbance of the mixed gas in the flow process, so that the mixed gas can be evenly mixed in the gas mixing section with a short path and a small space, thereby ensuring the flame effect formed by subsequent combustion, which is beneficial to ensuring the cutting quality of the continuous casting billet.

[0020] In this embodiment, the lower half of the oxygen channel 2 is configured as a tapered hole structure that gradually narrows from top to bottom, and each of the gas outlet sections 4-3 is inclined toward the direction close to the oxygen channel 2, and the inner diameter gradually decreases from top to bottom. Through the above configuration, the outlet pressure of oxygen and mixed gas can be increased.

[0021] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. An improved cutting nozzle structure for continuous casting billet cutting, characterized in that: The invention comprises a cutting nozzle body, wherein the cutting nozzle body is provided with an oxygen passage running through the middle thereof along its axis; a mixed gas inlet passage is provided from the outer side of the cutting nozzle body near the upper end thereof, wherein the mixed gas inlet passage comprises an inlet hole provided on the peripheral wall of the cutting nozzle body, the inner end of the inlet hole is communicated with an inlet cavity provided inside the cutting nozzle body and having a circular cross section; a plurality of mixed gas outlet passages are uniformly provided along the circumferential direction at the bottom of the inlet cavity, each of the mixed gas outlet passages comprises a tapered hole section, a mixing section and an outlet section which are sequentially connected from top to bottom, the inner diameter of the tapered hole section gradually decreases from top to bottom, and a spiral air guide sheet is fixedly provided on the inner peripheral wall, two groups of opposite refraction plates are staggeredly provided inside the mixing section, the refraction plates of each group are arranged to tilt upward along the axial direction close to the mixing section, and the outlet section extends to the bottom of the cutting nozzle body.

2. The improved cutting nozzle structure for continuous casting billet cutting according to claim 1 is characterized in that: The cutting nozzle body is provided with a first connector outside the upper end of the oxygen channel, and a second connector is provided outside the air inlet hole, and both the first connector and the second connector are provided with external threads.

3. The improved cutting nozzle structure for continuous casting billet cutting according to claim 1 is characterized in that: The lower half of the oxygen channel is configured as a tapered hole structure that gradually narrows from top to bottom.

4. The improved cutting nozzle structure for continuous casting billet cutting according to claim 1, characterized in that: Each of the gas outlet sections is arranged obliquely toward the direction close to the oxygen channel, and the inner diameter thereof gradually decreases from top to bottom.

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