Rust removal and corrosion prevention device for bent steel pipe

Abstract

The utility model provides a rust removal and corrosion prevention device for a bent steel pipe, which belongs to the technical field of steel pipe production and is characterized in that a center bending mold is arranged between a heating coil and an air cooling coil, and the steel pipe firstly enters the heating coil and then sequentially passes through the center bending mold, the air cooling coil, a laser rust remover and a PE (polyethylene) belt winding device; in order to integrally bend the steel pipe, the heating coil is used for heating the steel pipe, the heated steel pipe enters the center bending mold to bend one end of the steel pipe, and the bent steel pipe enters the air cooling coil to be rapidly subjected to air cooling shaping treatment after meeting the bending angle requirement. The steel pipe subjected to air cooling shaping is prone to being oxidized with active gas in air in the heating and bending process to form an oxidation layer, in order to remove the oxidation layer on the surface, a laser rust remover is used for conducting laser rust removal on the steel pipe, and in order to protect the surface of the bent steel pipe, a PE belt is evenly wound on the surface of the steel pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe production, in particular to a rust removal and corrosion prevention device for steel pipe bends. Background Art

[0002] At present, large-diameter steel pipes cannot be formed in one piece and treated with surface anti-corrosion. Generally, the steel pipes are divided into two parts for treatment. The anti-corrosion of bent pipes is mainly achieved through elbow processing, followed by offline heating for anti-corrosion, and then the elbows are welded to the ends of the steel pipes. This is a two-step process and is mainly manual operation, which requires a large amount of manpower, is labor-intensive, and requires high labor intensity. Heating is mainly carried out by natural gas and furnaces, which results in high combustion pollution emissions, low thermal efficiency, and serious energy waste. There are many invalid transfers between the two steps, the operation area occupies a large area, and the utilization rate of the production site is low. The quality of manual operation fluctuates greatly, and the quality stability is poor.

[0003] Therefore, there is an urgent need for a method that can bend and anti-corrosion treat steel pipes in one go. Utility Model Content

[0004] In view of this, the utility model proposes a device for one-time treatment of steel pipe bending and anti-corrosion.

[0005] The technical solution of the utility model is implemented as follows: a steel pipe bending rust removal and anti-corrosion device, including a bracket and a heating coil and an air-cooling coil arranged on the bracket, characterized in that it also includes a laser rust remover and a PE tape winding device, a bending core mold is arranged between the heating coil and the air-cooling coil, and the steel pipe first enters the heating coil and then passes through the bending core mold, the air-cooling coil, the laser rust remover and the PE tape winding device in sequence.

[0006] On the basis of the above technical solution, preferably, the core bending mold, laser rust remover and PE tape winding device are all arranged on the bracket.

[0007] On the basis of the above technical solution, preferably, the bending core mold includes a tube body and an inner tube, and the inner tube is arranged in the tube body and extends from one end of the tube body to the other end of the tube body.

[0008] On the basis of the above technical solution, preferably, one end of the inner tube is arranged opposite to the heating coil, and the inner diameter of the end of the inner tube opposite to the heating coil is larger than the inner diameter of the end of the inner tube away from the heating coil.

[0009] On the basis of the above technical solution, preferably, the inner tube is bent along a smooth arc.

[0010] On the basis of the above technical solution, preferably, the laser rust remover comprises a support seat, a support disk, a rotating disk and a laser, wherein the support disk is arranged on the support seat, the rotating disk is arranged on the support disk, and the laser is arranged on the rotating disk.

[0011] On the basis of the above technical solution, preferably, the support plate includes a mounting hole, the rotating plate includes a pipe hole, and the mounting hole is concentrically arranged with the pipe hole.

[0012] On the basis of the above technical solution, preferably, the laser rust remover further comprises at least three positioning pins, and a number of the positioning pins are fixedly arranged on the supporting disk around the rotating disk.

[0013] On the basis of the above technical solution, preferably, a sleeve is provided on the positioning nail.

[0014] On the basis of the above technical solution, preferably, the PE tape winding device includes a winding seat, a fixed disk, a winding disk, a PE roller, at least three auxiliary nails and a rotating shaft, the winding seat is fixedly set on the bracket, a plurality of auxiliary nails and a fixed disk are set on the winding seat, a plurality of auxiliary nails are set around the winding disk, the rotating shaft is set on the winding disk, and the rotating shaft passes through the PE roller.

[0015] On the basis of the above technical scheme, preferably, it also includes a plurality of steel pipe conveying racks, which are all fixedly arranged on the bracket, and the steel pipe conveying racks include supporting square tubes and supporting blades, and supporting rollers are arranged on the supporting blades, and a supporting shaft is arranged at the center of the supporting rollers, and one end of the supporting shaft is arranged on the supporting blades; the supporting rollers include two, and the two supporting rollers are located on the same horizontal plane.

[0016] The utility model of a steel pipe bending rust removal and anti-corrosion device has the following beneficial effects compared with the prior art:

[0017] (1) In order to bend the steel pipe in an integrated manner, the steel pipe is heated by a heating coil, and the heated steel pipe enters a bending core mold to bend one end of the steel pipe. After the bent steel pipe meets the bending angle requirement, it enters an air cooling coil for rapid air cooling and shaping. The air-cooled steel pipe is easily oxidized with active gases in the air to form an oxide layer during the heating and bending process. In order to remove the oxide layer on the surface, the steel pipe is laser rusted by a laser rust remover. In order to protect the surface of the bent steel pipe, a PE tape is evenly wrapped around the surface of the steel pipe;

[0018] (2) The length calculated by the above formula is under ideal conditions. Due to the different materials and toughness of the steel pipes, the actual bending process is not completely limited by the arc length. The smaller the toughness of the material, the actual length must be greater than L, and the greater the toughness, the actual length must be less than L. The length of L needs to be selected according to the actual situation;

[0019] (3) There are many kinds of steel pipe materials. The heating temperature and heating time of steel pipes of different materials are different. At this time, several common materials are selected to introduce the heating temperature and heating time of the heating coil. The heating time is usually determined by the conveying speed of the steel pipe. The higher the conveying speed, the shorter the heating time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of a steel pipe bending rust removal and anti-corrosion device of the utility model;

[0022] Figure 2 This is a three-dimensional diagram of a steel pipe bending rust removal and anti-corrosion device of the utility model;

[0023] Figure 3 This is a top view of a steel pipe bending rust removal and anti-corrosion device according to the utility model;

[0024] Figure 4 It is a three-dimensional diagram of the bending core mold of the utility model;

[0025] Figure 5 This is a three-dimensional diagram of the laser rust remover of the utility model;

[0026] Figure 6 A three-dimensional diagram of another structure of the laser rust remover of the utility model;

[0027] Figure 7 This is a three-dimensional diagram of the PE tape winding device of the utility model;

[0028] Figure 8 It is a three-dimensional diagram of the steel pipe conveying rack of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1-8As shown, a steel pipe bending rust removal and anti-corrosion device includes a bracket 1 and a heating coil 2 and an air cooling coil 3 arranged on the bracket 1, and also includes a laser rust remover 5 and a PE tape winding device 6. A bending core mold 4 is arranged between the heating coil 2 and the air cooling coil 3. The steel pipe first enters the heating coil 2 and then passes through the bending core mold 4, the air cooling coil 3, the laser rust remover 5 and the PE tape winding device 6 in sequence. Select a suitable steel pipe length, select a suitable heating coil according to the bending radius and the outer diameter of the steel pipe, set the heating coil at a predetermined position, and control the heating temperature and heating time of the heating coil, select the size of the bending core mold according to the outer diameter and bending radius of the steel pipe, and set the position of the air cooling coil, the position of the laser rust remover and the position of the PE tape winding device according to the running track of the steel pipe after bending. In order to bend the steel pipe in an integrated manner, the steel pipe is heated by a heating coil, and the heated steel pipe enters a bending core mold to bend one end of the steel pipe. After the bent steel pipe meets the bending angle requirement, it enters an air cooling coil for rapid air cooling and shaping. The air-cooled steel pipe is easily oxidized with active gases in the air to form an oxide layer during the heating and bending process. In order to remove the oxide layer on the surface, a laser rust remover is used to remove rust on the steel pipe. In order to protect the surface of the steel pipe after bending, a PE belt is evenly wrapped around the surface of the steel pipe. The bending core mold 4, the laser rust remover 5 and the PE belt winding device 6 are all arranged on the bracket 1.

[0031] The bending core mold 4 includes a tube body 41 and an inner tube 42. The inner tube 42 is arranged in the tube body 41 and extends from one end of the tube body 41 to the other end of the tube body 41. One end of the inner tube 42 is arranged opposite to the heating coil 2. The inner diameter of the end of the inner tube 42 opposite to the heating coil 2 is larger than the inner diameter of the end of the inner tube 42 away from the heating coil 2. The inner tube 42 is bent along a smooth arc. The outer diameter of the steel tube is D, the central angle corresponding to the bent part is α, the chord length is H, and the length of the selected steel tube is L. The outer diameter D of the steel pipe to be bent is certain, and the central angle α corresponding to the bending part is also certain. The length of the part to be bent is obtained by calculating the arc length of the bending part. The length calculated by the above formula is under ideal conditions. Due to the different materials and toughness of the steel pipe, the actual bending process is not completely limited by the arc length. The smaller the toughness of the material, the actual length must be greater than L, and the greater the toughness, the actual length must be less than L. The length of L needs to be selected according to the actual situation.

[0032] The inner diameter of the bending core mold is R, the wall thickness of the steel pipe is d, and D+0.5d≤R≤D+1.5d. If the bending core mold is to be able to shape the steel pipe, the inner diameter size of the bending core mold needs to be limited. The bending of the bending core mold is related to the wall thickness and material of the steel pipe. Without considering the influence of the material here, the size of the inner diameter of the bending core mold is directly related to the wall thickness of the steel pipe. According to multiple experiments, the inner diameter of the bending core mold is within the range of D+0.5d≤R≤D+1.5d.

[0033] The arc length of the bending core mold is N, In order to better shape the steel pipe, when the arc length of the bending core mold is the same as the arc length of the bending part of the steel pipe, the bending core mold is longer, and the friction between the entire steel pipe and the bending core mold is greater. If the arc length of the bending core mold is smaller, the bending effect of the steel pipe is not good. According to the experience summarized in actual production, it is known that the arc length of the bending core mold is The bending effect of the steel pipe is better when the steel pipe is bent, and the friction between the steel pipe and the bending core mold is smaller.

[0034] The laser rust remover 5 includes a support base 51, a support disk 52, a rotating disk 53 and a laser 54. The support disk 52 is arranged on the support base 51, the rotating disk 53 is arranged on the support disk 52, and the laser 54 is arranged on the rotating disk 53. The support disk 52 includes a mounting hole 521, and the rotating disk 53 includes a through-tube hole 531. The mounting hole 521 is arranged concentrically with the through-tube hole 531. The laser rust remover 5 also includes at least three positioning pins 55, and a plurality of the positioning pins 55 are fixedly arranged on the support disk 52 around the rotating disk 53; this embodiment provides a mode of four positioning pins 55, and the four positioning pins are at equal distances from the circular rotating disk 53. In order to reduce the friction between the positioning pins 55 and the rotating disk 53, a sleeve 551 is arranged on the positioning pin 55.

[0035] The heating coil is selected according to the outer diameter of the steel pipe, and the heating temperature of the heating coil is adjusted according to the material of the different steel pipes. The heating temperature of the carbon steel pipe is selected to be 700℃-900℃, the carbon steel pipe travel speed is v1, and the heating time is The v1 is 85 mm / min; the heating temperature of the alloy steel pipe is 900°C-1200°C, the alloy steel pipe travel speed is v2, and the heating time is The v2 is 75 mm / min; the heating temperature of the stainless steel pipe is 1000°C-1200°C, the stainless steel pipe travel speed is v3, and the heating time is The v3 is 65mm / min. There are many kinds of steel pipe materials, and the heating temperature and heating time of steel pipes of different materials are different. At this time, several common materials are selected to introduce the heating temperature and heating time of the heating coil. The heating time is usually determined by the speed of steel pipe transportation. The higher the transportation speed, the shorter the heating time.

[0036] In order to facilitate the conveying of steel pipes and control the conveying speed of steel pipes, several steel pipe conveying racks 7 are also included. Several of the steel pipe conveying racks 7 are fixedly arranged on the bracket 1. The steel pipe conveying rack 7 includes a supporting square tube 71 and a supporting blade 72. A supporting roller 73 is arranged on the supporting blade 72. A supporting shaft 74 is arranged at the center of the supporting roller 73. One end of the supporting shaft 74 is arranged on the supporting blade 72. The supporting roller 73 includes two supporting rollers 73, and the two supporting rollers 73 are located on the same horizontal plane. The steel pipe is between the two supporting rollers 73 on each steel pipe conveying rack 7.

[0037] According to the full length of the steel pipe, an air cooling coil is added after the heating coil. The air cooling coil is equipped with a temperature detection device and an air volume control system. The current temperature is detected according to the season and the process temperature required for the winding process. The monitoring data is fed back to the air control system, and the air control system changes the air volume according to the winding process temperature equipment. The air volume of the air cooling coil is controlled according to the steel pipe of different materials and different bending angles. In order to better air cool, a temperature detection device is added to the air cooling coil to monitor the temperature of the steel pipe in real time and cool the steel pipe more accurately.

[0038] Laser rust remover and PE belt winding device are set up in sequence on the path of the steel pipe after the air cooling coil. There will be heated oxides on the surface of the steel pipe after cooling, which will be continuously transmitted to the laser rust remover. The outer disk of the device is fixed and the inner disk is rotated around the pipe through the power transmission of the wheel. The laser rust remover laser emitter is fixed on the inner disk and is transmitted forward with the bent pipe to remove rust around. The rust removal meets the relevant requirements (≥Sa2.5).

[0039] In order to better perform rust-proof treatment on the bent steel pipe, we use a PE tape winding device 6 to wrap the PE tape on the surface of the steel pipe. The PE tape winding device 6 includes a winding seat 61, a fixed disk 62, a winding disk 63, a PE roller 64, at least three auxiliary nails 65 and a rotating shaft 66. The winding seat 61 is fixedly set on the bracket 1, a number of auxiliary nails 65 and a fixed disk 62 are set on the winding seat 61, a number of auxiliary nails 65 are set around the winding disk 63, a rotating shaft 66 is set on the winding disk 63, and the rotating shaft 66 is set through the PE roller 64.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rust removal and anti-corrosion device for steel pipe bends, comprising a bracket (1) and a heating coil (2) and an air cooling coil (3) arranged on the bracket (1), characterized in that: The invention also comprises a laser rust remover (5) and a PE tape winding device (6); a bending core mold (4) is arranged between the heating coil (2) and the air cooling coil (3); the steel pipe first enters the heating coil (2) and then passes through the bending core mold (4), the air cooling coil (3), the laser rust remover (5) and the PE tape winding device (6) in sequence.

2. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 1, characterized in that: The bending core mold (4), the laser rust remover (5) and the PE tape winding device (6) are all arranged on the bracket (1).

3. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 1, characterized in that: The bending core mold (4) comprises a tube body (41) and an inner tube (42), wherein the inner tube (42) is arranged inside the tube body (41) and extends from one end of the tube body (41) to the other end of the tube body (41).

4. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 3, characterized in that: One end of the inner tube (42) is arranged opposite to the heating coil (2), and the inner diameter of the end of the inner tube (42) opposite to the heating coil (2) is larger than the inner diameter of the end of the inner tube (42) away from the heating coil (2).

5. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 3, characterized in that: The inner tube (42) is bent along a smooth arc.

6. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 1, characterized in that: The laser rust remover (5) comprises a support seat (51), a support disk (52), a rotating disk (53) and a laser (54); the support disk (52) is arranged on the support seat (51), the rotating disk (53) is arranged on the support disk (52), and the laser (54) is arranged on the rotating disk (53).

7. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 6, characterized in that: The supporting plate (52) comprises a mounting hole (521), the rotating plate (53) comprises a pipe-through hole (531), and the mounting hole (521) and the pipe-through hole (531) are arranged concentrically.

8. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 6, characterized in that: The laser rust remover (5) further comprises at least three positioning pins (55), and a plurality of the positioning pins (55) are fixedly arranged on the supporting disk (52) around the rotating disk (53).

9. A steel pipe bending rust removal and anti-corrosion device as claimed in claim 8, characterized in that: The positioning nail (55) is provided with a sleeve (551).

10. The rust removal and corrosion protection device for steel pipe bends according to claim 1, characterized in that: It also includes a plurality of steel pipe conveying racks (7), wherein the plurality of steel pipe conveying racks (7) are fixedly arranged on the bracket (1), wherein the steel pipe conveying rack (7) includes a supporting square tube (71) and a supporting blade (72), wherein a supporting roller (73) is arranged on the supporting blade (72), wherein a supporting shaft (74) is arranged at the center of the supporting roller (73), and one end of the supporting shaft (74) is arranged on the supporting blade (72); and the supporting roller (73) includes two supporting rollers (73), and the two supporting rollers (73) are located on the same horizontal plane.

Images