CN212329263U - Large variable quantity oblique cutting type rotary pipe expander - Google Patents

Abstract

The utility model discloses a large-variable oblique-cutting rotary pipe expander, which comprises a frame, wherein a steel pipe input device, a steel pipe hot rolling device and a steel pipe output device are sequentially arranged on the frame, the steel pipe hot rolling device comprises at least three hot rolling rolls which are circumferentially and uniformly distributed, a hot rolling core head is rotatably arranged on the frame, an expanding support section is arranged on the hot rolling core head, and an expanding rolling section is arranged on the hot rolling roll; the diameter-expanding support section comprises a diameter-expanding support conical section and a forming support column section, the diameter-expanding rolling section comprises a diameter-expanding extrusion conical section and a forming pressure-stabilizing column section, a forming buffer conical section is arranged between the diameter-expanding support conical section and the forming support column section on the hot rolling core head, and the cone apex angle of the forming buffer conical section is smaller than that of the diameter-expanding support conical section. The utility model discloses a high quality hole enlargement operation can be accomplished under big reducing rate in the setting of shaping buffering conic section, is showing and is improving the reducing rate, does benefit to the one-time hot rolling shaping of heavy-calibre steel pipe.

Description

Large variable quantity oblique cutting type rotary pipe expander

Technical Field

The utility model relates to a steel pipe hot rolling equipment technical field especially relates to a rotatory expander of large variable volume oblique cutting formula.

Background

The steel pipe production comprises hot rolling, cold rolling and the like, wherein the hot rolling can refine grains better and eliminate defects. The diameter of the steel pipe is usually changed in the hot rolling process, the steel pipe is limited by the plasticity of the steel pipe and the like, and the structure of the roller core head at the present stage influences, so that the diameter change rate of the hot rolling can be about 30% at present, and the performance of the steel pipe is easily reduced and even defects occur due to the larger diameter change rate. Therefore, for large-diameter steel pipes, the steel pipes are often formed by hot rolling for many times, the energy consumption is high, the production efficiency is low, and the production cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a show improvement reducing rate is provided, does benefit to the rotatory expander of heavy variable inclined cutting formula of one shot hot rolling shaping of heavy-calibre steel pipe.

In order to solve the technical problem, the technical scheme of the utility model is that: the large-variable-quantity oblique-cutting type rotary pipe expander comprises a base, wherein a steel pipe input device, a steel pipe hot rolling device and a steel pipe output device are sequentially arranged on the base, a steel pipe heating device is arranged on the base at the position of the steel pipe input device, the steel pipe hot rolling device comprises at least three hot rolling rolls which are arranged on the base and are uniformly distributed in the circumferential direction, the hot rolling rolls are rotatably arranged at the same advancing angle, and the hot rolling rolls are jointly connected with a hot rolling driving device; the hot rolling mill is characterized in that a hot rolling core print which can extend to the hot rolling roll is rotatably arranged on the stand, at least one expanding support section is arranged on the hot rolling core print, and expanding rolling sections which correspond to the expanding support sections one to one are arranged on the hot rolling roll; the diameter-expanding support section comprises a diameter-expanding support conical section and a forming support column section which are sequentially arranged, the diameter-expanding rolling section comprises a diameter-expanding extrusion conical section corresponding to the diameter-expanding support conical section and a forming pressure-stabilizing column section corresponding to the forming support column section, a forming buffer conical section is arranged between the diameter-expanding support conical section and the forming support column section on the hot rolling core head, and the cone apex angle of the forming buffer conical section is smaller than the cone apex angle of the diameter-expanding support conical section.

As a preferred technical scheme, two expanding support sections are arranged on the hot rolling core head, and two expanding rolling sections corresponding to the two expanding support sections are arranged on the hot rolling roll.

Preferably, one end of the hot rolling core print close to the pipe incoming direction is provided with a pipe section.

Since the technical scheme is used, the utility model discloses the steel pipe after the heating reachs steel pipe hot rolling device department at first gets into between first hole enlargement extrusion conic section and the hole enlargement support conic section. The hot rolling core print mainly plays a role in supporting the steel pipe, and the hot rolling roll mainly plays a role in rolling the steel pipe. After the hot roll rotates, the hot rolling core print rotates in the opposite direction due to the action of friction force, and the steel pipe can move forward along the hot rolling core print due to the arrangement of the advancing angle of the hot roll. The arrangement of the forming buffer conical section enables a buffer space with thickened pipe wall to be formed between the hot rolling core head and the hot rolling roller, the steel pipe can be stored in the buffer space before entering the forming support column section and the forming pressure stabilizing column section, the stored steel pipe is extruded into the forming support column section and the forming pressure stabilizing column section under the extrusion action of the later steel pipe to form full cylindrical roll forming, the formed steel pipe is uniform and compact in structure and stable in performance, and defects are not prone to occurring. This sample utility model discloses a high quality hole enlargement operation can be accomplished under big reducing ratio in the setting of shaping buffering conic section, is showing and has improved the reducing ratio, does benefit to the one-time hot rolling shaping of heavy-calibre steel pipe.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the hot roll and the hot roll core according to the embodiment of the present invention, which is illustrated in a plan view for clarity of the matching structure of the sections;

fig. 3 is an enlarged schematic view of the structure at I in fig. 2.

In the figure: 1-a machine base; 11-steel pipe input device; 12-steel tube output device; 13-steel tube heating device; 14-steel tube hot rolling device; 2-hot rolling the core print; 21-expanding the diameter of the supporting section; 22-expanding a supporting conical section; 23-forming a support column section; 24-forming a buffer conical section; 25-a conduit section; 26-hot rolling the core rod; 3-hot roll; 31-expanding the diameter of the rolling section; 32-expanding and extruding the conical section; 33-forming a pressure stabilizing column section; 4-hot rolling drive.

Detailed Description

The invention is further explained below with reference to the drawings and examples. In the following detailed description, exemplary embodiments of the invention are described by way of illustration only. Needless to say, a person skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

As shown in fig. 1, 2 and 3, the large variable skew rotary pipe expander includes a machine base 1, and the machine base 1 is provided with a steel pipe input device 11, a steel pipe hot rolling device 14 and a steel pipe output device 12 in sequence. The steel pipe input device 11 and the steel pipe output device 12 both adopt a conventional three-roller conveying structure with a forward angle, and three rollers are respectively and universally connected with the three rollers through a power distribution frame driven by a driving device and three output ends on the power distribution frame to realize three-roller conveying. This is prior art as known to those skilled in the art and will not be described in detail herein.

A steel pipe heating device 13 is arranged on the machine base 1 at the position of the steel pipe input device 11, and conventionally, the steel pipe heating device 13 adopts intermediate frequency heating to heat the steel pipe to the temperature required by hot rolling.

The steel pipe hot rolling device 14 comprises at least three hot rolls 3 which are installed on the stand 1 and are uniformly distributed in the circumferential direction, each hot roll 3 is rotatably installed at the same advancing angle, and the hot rolls 3 are connected with a hot rolling driving device 4 together. The embodiment shows three hot rolls 3, and the installation and driving of the three hot rolls are substantially the same as the structures of the steel pipe input device 11 and the steel pipe output device 12, which are well known to those skilled in the art and will not be described herein again.

The hot rolling core print 2 capable of extending to the hot rolling roller 3 is rotatably installed on the machine base 1, and conventionally, the hot rolling core print 2 is rotatably installed in two modes, one mode is that a hot rolling core bar 26 is clamped on the machine base 1 through three rollers, and the hot rolling core print 2 is fixedly arranged at the end part of the hot rolling core bar 26; and secondly, a core rod roadster is arranged on the stand 1, a hot rolling core rod 26 is rotatably arranged on the core rod roadster, and the end part of the hot rolling core rod 26 is fixedly provided with the hot rolling core head 2. Both of the above two ways are known in the prior art and will not be described herein.

The hot rolling core print 2 is provided with at least one expanding support section 21, and the hot rolling roll 3 is provided with expanding rolling sections 31 corresponding to the expanding support sections 21 one by one. The expanding support section 21 comprises an expanding support conical section 22 and a forming support column section 23 which are arranged in sequence, and the expanding support conical section and the forming support column section are arranged in sequence along the advancing direction of the steel pipe. Conventionally, the cross-sectional area of the expanding support cone 22 is gradually increased along the advancing direction of the steel pipe.

The expanding roller section 31 comprises an expanding extrusion conical section 32 corresponding to the expanding support conical section 22 and a forming pressure stabilizing column section 33 corresponding to the forming support column section 23. And a forming buffer conical section 24 is arranged between the diameter-expanding support conical section 22 and the forming support column section 23 on the hot rolling core print 2, and the conical vertex angle of the forming buffer conical section 24 is smaller than that of the diameter-expanding support conical section 22. In this way, from a sectional view, the shaped buffer cone 24 and the hot roll 3 approximately form a triangular enlarged area, which allows the steel pipe to buffer and accumulate there, and the wall thickness is increased.

In the embodiment, the hot rolling core print 2 mainly plays a role in supporting the steel pipe, and the hot rolling roll 3 mainly plays a role in rolling the steel pipe. After the hot roll 3 rotates, rolling friction mainly exists between the hot roll 3 and a steel pipe, static friction mainly exists between the steel pipe and the hot rolling core print 2, and the hot rolling core print 2 rotates in the opposite direction under the combined action of friction. And the steel pipe can advance along the hot rolling core print 2 due to the advancing angle setting of the hot rolling roll 3. In the forward process, the inner surface of the steel pipe is formed by taking the outer surface of the hot rolling core print 2 as a reference, and the rolling action of the hot rolling roller 3 can promote the self flow of the steel pipe at high temperature, promote the uniform structure of the steel pipe and eliminate defects.

When the heated steel pipe of this embodiment reaches the hot rolling device 14, it first enters between the diameter-expanding extrusion cone 32 and the diameter-expanding support cone 22. In this embodiment, a conduit section 25 is arranged at one end of the hot rolling core print 2 close to the pipe incoming direction, and the conduit section 25 is beneficial for a steel pipe to be smoothly sleeved on the hot rolling core print 2 and to smoothly reach between the diameter expanding extrusion conical section 32 and the diameter expanding support conical section 22; the conduit section 25 is conventionally of conical design. And in the process of advancing the steel pipe by rolling and rolling, the diameter expansion is gradually formed between the diameter expansion extrusion conical section 32 and the diameter expansion supporting conical section 22. The expanded steel pipe firstly reaches the forming buffer conical section 24 for buffer storage and wall thickening, the stored steel pipe material can better promote internal welding under the action of high temperature, the defects of gaps, cracks, bubbles and the like are eliminated, and the stored steel pipe is extruded between the forming support column section 23 and the forming pressure-stabilizing column section 33 under the action of subsequent steel pipe extrusion and rolling of the hot rolling roll 3 to form a full cylindrical roll forming. Thus, the forming buffer conical section 24 is arranged in the embodiment, the original defects of the steel pipe, cracks, thin walls and the like in the diameter expanding process can be obviously eliminated, the formed steel pipe has uniform and compact structure and stable performance, and the thickness dimension of the steel pipe can be well controlled. In conclusion, the embodiment can complete high-quality diameter expansion operation under the condition of large diameter changing rate, obviously improves the diameter changing rate and is beneficial to one-time hot rolling and forming of large-diameter steel pipes.

Preferably, two expanding support sections 21 are disposed on the hot rolling core 2, and two expanding rolling sections 31 corresponding to the two expanding support sections 21 are disposed on the hot rolling roll 3. Therefore, the steel pipe of the embodiment can be continuously subjected to twice diameter expansion, buffer accumulation and forming above the recrystallization temperature, so that the secondary diameter expansion is realized, the diameter-changing rate is further improved while the high-quality diameter expansion output is ensured, the diameter-changing rate can reach 80%, a breakthrough technology of large-variable diameter expansion is formed, and the steel pipe has extremely high economic value and social value.

The basic principles, main features and advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (3)

1. Rotatory pipe expander of large variable oblique cutting formula, including the frame, be equipped with steel pipe input device, steel pipe hot rolling device and steel pipe output device on the frame in proper order, lie in on the frame steel pipe input device department is equipped with steel pipe heating device, its characterized in that: the steel pipe hot rolling device comprises at least three hot rolls which are arranged on the stand and are uniformly distributed in the circumferential direction, the hot rolls are rotatably arranged at the same advancing angle, and the hot rolls are connected with a hot rolling driving device together; the hot rolling mill is characterized in that a hot rolling core print which can extend to the hot rolling roll is rotatably arranged on the stand, at least one expanding support section is arranged on the hot rolling core print, and expanding rolling sections which correspond to the expanding support sections one to one are arranged on the hot rolling roll; the diameter-expanding support section comprises a diameter-expanding support conical section and a forming support column section which are sequentially arranged, the diameter-expanding rolling section comprises a diameter-expanding extrusion conical section corresponding to the diameter-expanding support conical section and a forming pressure-stabilizing column section corresponding to the forming support column section, a forming buffer conical section is arranged between the diameter-expanding support conical section and the forming support column section on the hot rolling core head, and the cone apex angle of the forming buffer conical section is smaller than the cone apex angle of the diameter-expanding support conical section.

2. The large variable capacity miter cut rotary pipe expander of claim 1, wherein: the hot rolling core head is provided with two expanding support sections, and the hot rolling roll is provided with two expanding rolling sections corresponding to the two expanding support sections respectively.

3. The large variable capacity miter cut rotary pipe expander of claim 1, wherein: the hot-rolled core head is provided with a conduit section at one end close to the pipe direction.

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