Sublance not prone to being stained with steel slag

Abstract

The invention relates to the technical field of sublance, in particular to a sublance not prone to being stained with steel slag. Comprising a gun body, the gun body comprises a central tube, a middle-layer tube and an outer-layer tube are sequentially arranged outside the central tube, a gun head is arranged at the lower end of the gun body, a connecting sleeve is arranged at the bottom of the gun head, a concave table is arranged on the bottom face of the gun head, the concave table and the connecting sleeve are coaxial, and the top of a probe can be inserted into the concave table. The device is not prone to damage and long in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of sub-lances, and in particular to a sub-lance that is not easily adhered with steel slag. Background Art

[0002] A sub-lance is a metal lance that can be lifted and inserted into a converter. A probe can be inserted at its lower end to measure data such as the temperature, oxygen content, and carbon content of molten steel. The patent with the application number 202321927721.8 discloses a structure for preventing the lower end face of a sub-lance from sticking with steel slag, including a sub-lance body. A connecting sleeve is arranged at the lower end of the sub-lance body. A quartz sheet with a circular ring-shaped cross-section is arranged on the lower end face of the sub-lance body. The inner diameter of the quartz sheet is smaller than the outer diameter of the probe, and the outer diameter of the quartz sheet is larger than the outer diameter of the probe. The quartz sheet can prevent the lower end face of the sub-lance from sticking with steel slag, so that the situation where the probe cannot be inserted in place due to steel slag will not occur. It can be reused multiple times without improving the probe that needs to be replaced for each detection, and the cost is relatively low. However, after long-term use, the quartz sheet will inevitably be damaged. Summary of the Invention

[0003] The technical problem to be solved by the present invention is, aiming at the above-mentioned existing technical deficiencies, to provide a sub-lance that is not easily adhered with steel slag.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a sub-lance that is not easily adhered with steel slag, including a lance body. The lance body includes a central tube. A middle layer tube and an outer layer tube are sequentially arranged outside the central tube. A lance head is arranged at the lower end of the lance body. A connecting sleeve is arranged at the bottom of the lance head. A concave platform is arranged on the bottom surface of the lance head. The concave platform is coaxial with the connecting sleeve. The top of the probe can be inserted into the concave platform.

[0005] Further optimizing the technical solution, a second chamfer is arranged on the outer edge of the top of the probe.

[0006] Further optimizing the technical solution, a third chamfer is arranged on the inner edge of the top of the probe.

[0007] Further optimizing the technical solution, a threaded hole is arranged on the lance head. An external threaded portion for connecting with the threaded hole is arranged on the top of the connecting sleeve. The bottom of the external threaded portion is flush with the bottom surface of the lance head.

[0008] Further optimizing the technical solution, the outer diameter of the connecting sleeve is larger than the outer diameter of the external threaded portion. A first chamfer is arranged on the outer edge of the upper part of the connecting sleeve at the combined part with the external threaded portion.

[0009] Further optimizing the technical solution, a third chamfer is arranged on the inner edge of the top of the probe.

[0010] To further optimize this technical solution, the outer side surface of the concave platform is a conical surface, and the diameter of the conical surface gradually increases in the direction from near to far from the bottom surface of the lance tip.

[0011] Compared with the prior art, the present invention has the following advantages: 1. A concave platform is provided on the bottom surface of the lance tip at the lower end of the gun body, and the top of the probe can be inserted into the concave platform, making it difficult for steel slag to enter the gap between the two and adhere to the concave platform, and the concave platform is not easily damaged; 2. The outer side surface of the concave platform is a conical surface, making it difficult for the probe to be pushed downward. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a sublance that is not easily adhered with steel slag.

[0013] Figure 2 It is a schematic structural diagram of a sublance that is not easily adhered with steel slag after installing the probe.

[0014] In the figure: 1. Lance tip; 11. Concave platform; 111. Conical surface; 2. Connecting sleeve; 21. First chamfer; 3. Probe; 31. Second chamfer; 32. Third chamfer. Detailed Embodiments

[0015] To make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concept of the present invention.

[0016] Detailed Embodiments: As shown in Figure 1-2 A sublance that is not easily adhered with steel slag includes a gun body. The gun body includes a central tube, and a middle layer tube and an outer layer tube are sequentially arranged outside the central tube. A lance tip 1 is provided at the lower end of the gun body. A connecting sleeve 2 is provided at the bottom of the lance tip 1. A holder and a connector (not shown in the figure) are sequentially connected below the connecting sleeve 2. A concave platform 11 is provided on the bottom surface of the lance tip 1. The cross-section of the concave platform 11 is circular. The concave platform 11 is coaxial with the connecting sleeve 2. The top of the probe 3 can be inserted into the concave platform 11. For the probe 3 that is matched with this sublance, the part of the probe located above the multi-core connector (used to connect with the connector on the sublance) is longer than a normal probe, so that after the probe is connected, the top of the probe 3 can be inserted into the concave platform 11. The gap between the probe 3 and the concave platform 11 is small, and it is difficult for steel slag to enter the gap between the two and adhere to the concave platform 11, and the situation where the probe 3 cannot be inserted in place due to steel slag will not occur.

[0017] Furthermore, a second chamfer 31 is provided at the outer edge of the top of the probe 3, so that the top of the probe 3 can easily enter the concave table 11. A third chamfer 32 is provided at the inner edge of the top of the probe 3. The third chamfer 32 should be relatively large, so that the wall thickness of the top of the probe 3 becomes thinner. In this case, the outer diameter of the probe 3 can be equal to or slightly larger than the diameter of the lower end of the concave table 11. When the probe 3 is inserted, the top of the probe 3 will be slightly deformed and thus can be inserted into the concave table 11, so that there is no gap between the top of the probe 3 and the lower end of the concave table 11.

[0018] Specifically, a threaded hole is provided on the gun head 1, and an external threaded portion for connecting with the threaded hole is provided at the top of the connecting sleeve 2. The bottom of the external threaded portion is flush with the bottom surface of the gun head 1. The outer diameter of the connecting sleeve 2 is larger than the outer diameter of the external threaded portion. A first chamfer 21 is provided at the outer edge of the upper part of the connecting sleeve 2 at the position where it combines with the external threaded portion.

[0019] Furthermore, the outer side surface of the concave table 11 is a conical surface 111, and the diameter of the conical surface 111 gradually increases in the direction from near to far from the bottom surface of the gun head 1. At this time, the outer diameter of the probe 3 can be slightly larger than the diameter of the lower end of the concave table 11. After the top of the probe 3 is inserted into the concave table 11, the part located at the lower opening of the concave table 11 is compressed. Since the contact surface between the probe 3 and the outer side surface of the concave table 11 is relatively small, the lower edge of the lower opening of the concave table 11 will sink into the outer surface of the probe 3 to some extent, and the parts located above and below the lower opening of the concave table 11 will tend to return to their original diameters, making it difficult to push the probe 3 downward. If the outer side surface is a cylindrical surface, since the part of the probe 3 located below the lower opening of the concave table 11 inclines inward, a force in the obliquely downward direction is generated when interacting with the concave table 11, and it is easy to push the probe 3 downward.

Claims

1. A sublance that is not easily contaminated by steel slag, comprising a lance body. The lance body includes a central tube, and a middle layer tube and an outer layer tube are sequentially arranged outside the central tube. A lance head (1) is arranged at the lower end of the lance body, and a connecting sleeve (2) is arranged at the bottom of the lance head (1). It is characterized in that: The bottom surface of the gun head (1) is provided with a concave platform (11), the concave platform (11) is coaxial with the connecting sleeve (2), and the top of the probe (3) can be inserted into the concave platform (11).

2. The sublance that is not easily stained with steel slag according to claim 1, wherein: A second chamfer (31) is provided on the outer edge of the top of the probe (3).

3. The sublance according to claim 2, which is not easily contaminated with steel slag, is characterized in that: A third chamfer (32) is provided on the inner edge of the top of the probe (3).

4. A sublance that is not easily contaminated with steel slag according to claim 2, characterized in that: A threaded hole is provided on the gun head (1), and an external threaded portion for connecting with the threaded hole is provided on the top of the connecting sleeve (2), and the bottom of the external threaded portion is flush with the bottom surface of the gun head (1).

5. The sublance that is not easily contaminated by steel slag according to claim 4, wherein: The outer diameter of the connecting sleeve (2) is larger than the outer diameter of the external threaded portion, and a first chamfer (21) is provided on the outer edge of the upper part of the connecting sleeve (2) at the part where it combines with the external threaded portion.

6. A sublance that is not easily contaminated with steel slag according to any one of claims 2-5, characterized in that: The outer side surface of the concave platform (11) is a conical surface (111), and the diameter of the conical surface (111) gradually increases in the direction from near to far from the bottom surface of the gun head (1).

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