Sheath converter for internally grinding pipe end of special-shaped steel pipe

Abstract

The utility model relates to a sheath converter for internally grinding a pipe end of a special-shaped steel pipe. A stop circular plate (3) made of a circular steel plate with a hole in the center is connected in a sheath (1) made of a large-diameter thin-wall steel pipe in a spot welding manner and is fixed on the inner surface of the steel pipe; a limiting arc plate (2) made of an arc-shaped steel plate is welded to the inner surface of the end, close to the to-be-machined special-shaped pipe end steel pipe (4), of the protective sleeve (1). According to the special-shaped pipe end steel pipe internal grinding device, the technical problem of normal internal grinding of the pipe end large bevel opening of the special-shaped pipe end steel pipe (4) is solved, and after the special-shaped pipe end steel pipe (4) is machined, automatic machine internal grinding machining can be completed on the premise that the shape of the special-shaped pipe end steel pipe (4) is not damaged in subsequent steel pipe internal grinding machining.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical auxiliary equipment and relates to a sheath converter used for internal grinding of special-shaped steel pipe ends in an automatic machine. Background Art

[0002] During the production and manufacturing process of steel pipes, some steel pipes may have uneven ends due to oxygen cutting and other reasons, and even have large slopes at the ends ( Figure 1 As shown). Because of the pits on the inner surface of the steel pipe, it needs to be polished and leveled, but the large bevel at the end of the cut steel pipe makes it impossible to perform internal grinding with an automatic machine. When grinding with an automatic machine, one end of the steel pipe needs to support the top pile to prevent the steel pipe from moving forward during internal grinding, and the steel pipe needs to rotate during internal grinding (see Figure 2 ). Because the large beveled pipe end cannot support the top pile when grinding in the automatic machine, the steel pipe will run forward and will be stuck and unable to rotate.

[0003] The existing technology adopts the following methods: 1) first cutting off the bevel of one end of the pipe to make the pipe end flush, and then processing the bevel of the pipe end after internal grinding, which will lead to the steel pipe being scrapped due to length not meeting the requirements; 2) manual internal grinding, using an internal grinder with a handheld extension rod to grind the inner surface of the steel pipe, which has extremely low work efficiency and uneven internal grinding.

[0004] The above-mentioned prior art has the following main disadvantages: ① The steel pipe with a large beveled end cannot be internally ground by an automatic machine. Because the large beveled end cannot support the top pile during internal grinding, the steel pipe will move forward and will be stuck and unable to rotate. ② The processing is easy to scrap. Cutting off the bevel of one end of the pipe to make the pipe end flush, and then processing the bevel of the pipe end after internal grinding will lead to the steel pipe being scrapped because the length does not meet the requirements; ③ The efficiency is extremely low. If a handheld extension rod internal grinder is used to grind the inner surface of the steel pipe, the efficiency is very low and the internal grinding quality is poor. Utility Model Content

[0005] The utility model aims to provide a sheath converter for internal grinding of special-shaped steel pipe ends, which solves the technical problem that a steel pipe with a large bevel at the pipe end can be normally internally ground. After the special-shaped steel pipe end is processed, the internal grinding process can be completed without destroying the morphology of the pipe end in the subsequent internal grinding process.

[0006] Technical solution in this utility model:

[0007] A sheath converter used for internal grinding of special-shaped steel pipe ends has a stop circular plate made of a circular steel plate with a central hole spot welded to the inner wall of a sheath made of a large-diameter thin-walled steel pipe; a stop circular arc plate made of an arc-shaped steel plate is welded to the inner wall of one end of the sheath adjacent to the special-shaped pipe end to be processed.

[0008] Furthermore, the sheath is formed by butt welding two sections of short steel pipes with a large diameter and a thin wall.

[0009] Furthermore, the inner diameter of the jacket is 6 to 12 mm larger than the outer diameter of the steel pipe to be internally ground. If the gap is too large, the gap can be adjusted by increasing the thickness of the limiting arc plate.

[0010] Furthermore, the sheath has a length of 400 to 600 mm and a wall thickness of 8 to 10 mm.

[0011] The beneficial effects of the utility model are as follows: one end of the sheath converter is put on the outside of the special-shaped pipe end to be internally ground so that it becomes flush with the pipe end and is pressed against the top pile, so that the steel pipe can complete the internal grinding process. The two ends of the sheath converter for the internally ground special-shaped pipe end are flush, and one end is put on the outside of the special-shaped pipe end to be internally ground so that it becomes flush with the pipe end and is pressed against the top pile, so that the steel pipe can be normally internally ground by an automatic machine on the internal grinding stand. The special-shaped pipe end rotates in the sheath, and is supported by the steel plate inside the sheath so that it will not move forward and will not affect the rotation of the steel pipe and the sheath together, so as to achieve the effect of completing the internal grinding without damaging the special-shaped pipe end. It is simple to make, easy to select materials, and has a low manufacturing cost. The sheath converter for the internally ground special-shaped pipe end perfectly solves the problem that the special-shaped pipe end is easy to be damaged and cannot be subsequently processed by an automatic machine internal grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The pipe end is a steel pipe with a special-shaped large bevel to be internally ground.

[0013] Figure 2 The schematic diagram of the normal automatic internal grinding of steel pipes by the prior art is shown.

[0014] Figure 3 It is a three-view drawing of the sheath converter used for the special-shaped pipe end of the internally ground steel pipe according to the utility model.

[0015] Figure 4 It is a schematic diagram of using the sheath converter of the utility model to be sheathed on a special-shaped pipe end.

[0016] Figure 4 In the figure: 1-sheath; 2-limiting arc plate; 3-stop circular plate; 4-special-shaped pipe end steel pipe. DETAILED DESCRIPTION

[0017] The following is an explanation of the embodiments with reference to the accompanying drawings.

[0018] Figure 3 As shown: a sheath converter used for internal grinding of special-shaped steel pipe ends, a stop circular plate 3 made of a circular steel plate with a central opening is spot-welded inside a sheath 1 made of a large-diameter thin-walled steel pipe; a stop circular arc plate 2 made of an arc-shaped steel plate is welded to the inner surface of one end of the sheath 1 adjacent to the special-shaped pipe end steel pipe 4 to be processed.

[0019] Figure 4As shown in the figure: The sheath converter for the special-shaped inner grinding pipe end is sleeved on the special-shaped pipe end. The steel pipe 4 to be internally ground with a large beveled pipe end is inserted into the sheath converter for the special-shaped inner grinding pipe end of the present utility model, and internal grinding can be carried out. One end of the sheath converter is sleeved on the steel pipe 4 with a special-shaped pipe end. The sloped end of the steel pipe 4 with a special-shaped pipe end becomes a flat pipe end through the sheath converter. Then, the flat pipe end of the sheath 1 is abutted against the top pile groove from below. The steel pipe 4 with a special-shaped pipe end and the top pile both rotate at a slower speed. The internal grinding rod drives the rapidly rotating internal grinding head to extend into the inner surface of the steel pipe 4 from the other end of the steel pipe. The grinding head is close to the inner surface of the steel pipe 4 to complete Figure 2 Normal internal grinding processing by an automatic machine.

[0020] Manufacture of the sheath converter:

[0021] 1) Manufacture of the sheath 1: Select a section of large-diameter thin-walled steel pipe (or two short-section steel pipes can be butt-welded). Its inner diameter should be 6 - 12 mm larger than the outer diameter of the steel pipe 4 to be internally ground. The wall thickness of the sheath is generally taken as 8 - 10 mm. If it is too thick, it is not conducive to manual handling of the sheath. If it is too thin, it is easy to deform and affect the use safety. The length of the sheath is generally selected to be 400 - 600 mm.

[0022] 2) Manufacture of the stop circular plate 2: Oxygen-cut a circular steel plate with an outer diameter slightly smaller than the inner hole of the sheath from a steel plate about 10 mm thick. Welding the circular steel plate in the inner hole of the sheath is to fix the rotation range of the steel pipe 4 with a special-shaped pipe end in the sheath and protect the morphology of the steel pipe 4 with a special-shaped pipe end. Welding the circular steel plate 60 mm away from the steel pipe 4 with a special-shaped pipe end at one end of the sheath is also for convenient hoisting with a pipe end hook. Oxygen-cut a circular hole with a diameter of 180 mm in the middle of the stop circular plate 3 to facilitate observing the rotation of the pipe end bevel during internal grinding.

[0023] 3) Manufacture of the limit arc plate 3: If the gap between the inner hole of the sheath 1 and the outer diameter of the steel pipe 4 with a special-shaped inner grinding pipe end is too large, a circular arc-shaped steel plate 2 can be welded on the inner surface of the sheath 1 inserted into the steel pipe 4 with a special-shaped pipe end to reduce the radial movement of the steel pipe 4 with a special-shaped pipe end in the sheath.

Claims

1. A sheath converter for internally grinding the ends of special-shaped steel pipes, characterized by: A stopper circular plate (3) made of a circular steel plate with a central opening is spot welded to the inner wall of a jacket (1) made of a large-diameter thin-walled steel pipe; and a stopper circular arc plate (2) made of an arc-shaped steel plate is welded to the inner wall of one end of the jacket (1) adjacent to the special-shaped pipe end steel pipe (4) to be processed.

2. The sheath converter for internal grinding of special-shaped steel pipe ends according to claim 1 is characterized in that: The sheath (1) is a section of large-diameter thin-walled steel pipe, or two sections of short steel pipes that are butt-welded.

3. The sheath converter for internal grinding of special-shaped steel pipe ends according to claim 1 is characterized in that: The inner diameter of the sleeve (1) is 6 to 12 mm larger than the outer diameter of the steel pipe to be internally ground.

4. The sheath converter for internal grinding of special-shaped steel pipe ends according to claim 1 is characterized in that: The sheath (1) has a length of 400 to 600 mm and a wall thickness of 8 to 10 mm.

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