Blast furnace stokehole tapping machine drill rod

Abstract

The utility model relates to the field of smelting furnace front equipment, in particular to a blast furnace front tapping machine drill rod. Connecting threads connected with a drill bit are arranged at the front end of the rod body. The connecting threads are wave-shaped threads, the length of the wave-shaped threads is 80 mm, and the number of the wave-shaped threads is three. By improving the shape and the number of turns of the threads at the front end of the tapping machine drill rod, not only can the connection strength requirement of tapping be met, but also the defects of the original thread design be made up, the waste of the drill rod is avoided, the production cost is greatly reduced, the labor intensity of workers is reduced, the tapping time is shortened, the furnace operation is facilitated, and the powerful effect of increasing the production and reducing the efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the field of smelting furnace front equipment, namely a drill rod of a blast furnace front opening machine. Background Art

[0002] In the prior art, the drill rod of the furnace opening machine is an important equipment for opening the iron mouth and tapping iron in the blast furnace during blast furnace smelting. The main function of the drill rod of the furnace opening machine is to use the opening machine in conjunction with the drill rod and the drill bit to drill open the blocked iron mouth, so that the molten iron in the blast furnace can smoothly flow out of the blast furnace through the iron mouth channel. The main structure of the drill rod of the furnace opening machine is a hollow cylinder with a length of 5600mm and a diameter of 38mm (the inner hollow is a diameter of 10mm), which is divided into a front end and a rear end. The rear end is installed on the rock drill of the opening machine, and the front end is an 80mm long trapezoidal thread fastening drill bit, see Figure 2 , 3 . In the past, the thread at the front end of the drill rod of the furnace opening machine was a five-turn trapezoidal deep thread. This thread design has certain defects: 1. The drill rod waste increases costs. When opening the iron mouth, the drill bit needs to be replaced because the drill bit alloy head is worn. The drill rod trapezoidal deep thread design makes it difficult to remove the drill bit from the drill rod. Since the drill bit cannot be separated from the drill rod, the drill rod and the drill bit are often forced to be discarded together, which leads to the waste of drill rod and increases costs. 2. Increase the labor intensity of workers, extend the time of opening the iron mouth, and indirectly affect the operation in the furnace. To replace the drill bit on site, workers need to use a sledgehammer and a pipe clamp, which wastes workers' physical strength. The difficulty in removing the drill bit leads to a waste of time, which also prolongs the time of opening the iron mouth. If the iron mouth is opened for more than a certain time, it will cause the furnace to be suffocated and the slag iron will not be discharged in time, which will affect the operation in the furnace. Utility Model Content

[0003] The utility model aims to provide a blast furnace front opening machine drill rod which is easy to replace in view of the above-mentioned shortcomings.

[0004] The technical solution of the utility model is: a drill rod of a blast furnace opening machine comprises a rod body, a connecting thread connected to a drill bit is provided at the front end of the rod body, and the connecting thread is characterized in that a wave thread is adopted, the wave thread length is 80 mm, and the wave thread is three turns.

[0005] The advantages of the utility model are as follows: 1. By improving the shape and number of turns of the front end thread of the drill rod of the opening machine, the connection strength requirements of the opening of the iron mouth can be met, and the defects of the original thread design can be made up. The trapezoidal thread at the front end of the drill rod is changed into a three-turn wave thread. Such a design basically avoids the disadvantage that the drill bit and the drill rod are difficult to separate. By improving the design of the front end thread of the drill rod, the waste of the drill rod is basically eliminated, which greatly reduces the production cost. Originally, each shift opened the iron mouth an average of 6 times, and an average of 5 drill rods were used. Now, each shift opened the iron mouth an average of 6 times, and an average of 2-3 drill rods are used. 2. When replacing the drill bit, pipe clamps and sledgehammers are no longer used. In 90% of cases, it can be disassembled by hand twisting, which greatly reduces the labor intensity of workers, shortens the time of opening the iron mouth, is conducive to the operation in the furnace, and plays a powerful role in increasing production and reducing efficiency.

[0006] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the corrugated thread at the front end of the drill rod of the utility model.

[0008] Figure 2 It is a schematic diagram of the drill rod before improvement of the utility model.

[0009] Figure 3 It is a simplified diagram of the trapezoidal thread at the front end of the improved drill rod of the utility model. DETAILED DESCRIPTION

[0010] See also Figure 1 , 2 , 3. The names of the parts are as follows: rod body 1, wave thread 2, trapezoidal thread 3.

[0011] See also Figure 1 , a drill rod for a blast furnace opening machine includes a rod body 1, a corrugated thread 2 connected to a drill bit is provided at the front end of the rod body 1, the length of the corrugated thread 2 is L=80mm, and the corrugated thread 2 is three turns. The drill bit (picture omitted) is connected to the rod body 1 by a corrugated thread 2. The three turns of corrugated thread 2 are easier to process than the trapezoidal thread 3, and save time and labor. In addition, the drill bit and the drill rod will be deformed by heat when drilling the iron mouth. The corrugated thread 2 is less deformed by heat, while the trapezoidal thread 3 is more deformed by heat due to obvious edges and corners, which makes it difficult to disassemble, time-consuming and labor-intensive. Changing the trapezoidal thread 3 at the front end of the drill rod to the corrugated thread 2 can save drill rods and reduce the labor intensity of workers, saving the cost of opening the iron mouth.

Claims

1. A drill rod for a blast furnace opening machine, comprising a rod body (1), the front end of the rod body (1) having a connecting thread connected to a drill bit, characterized in that The connecting thread adopts a wave thread (2), the length of the wave thread (2) is 80 mm, and the wave thread (2) is three turns.

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