阅读说明：本技术 一种钢管外表面深度除锈设备 (Steel pipe surface degree of depth rust cleaning equipment ) 是由 钟易民 于 2020-12-22 设计创作，主要内容包括：本发明公开一种钢管外表面深度除锈设备,包括化学除锈装置和机械除锈装置,所述机械除锈装置包括旋转筒、刷锈模块和旋转驱动机构,所述刷锈模块包括至少两个粗刷模块和至少两个细刷模块；所述粗刷模块包括粗刷安装块、粗刷钢丝以及匀化滚筒,所述粗刷钢丝设有多个,该粗刷钢丝的一端固定连接在粗刷安装块上,另一端延伸至旋转筒的内腔中；所述匀化滚筒设有两个,两个匀化滚筒分别位于在粗刷钢丝的两侧；所述匀化滚筒通过弹性伸缩结构连接在粗刷安装块上,所述细刷模块包括细刷安装块和细刷砂块。该钢管外表面深度除锈设备不仅能够比较彻底地去除钢管表面的铁锈,除锈质量较好,而且还具有结构简单、占用体积小、成本低以及易于广泛应用等优点。(The invention discloses deep rust removing equipment for the outer surface of a steel pipe, which comprises a chemical rust removing device and a mechanical rust removing device, wherein the mechanical rust removing device comprises a rotary cylinder, a rust brushing module and a rotary driving mechanism, and the rust brushing module comprises at least two rough brush modules and at least two fine brush modules; the coarse brush module comprises a plurality of coarse brush mounting blocks, coarse brush steel wires and a homogenizing roller, wherein one ends of the coarse brush steel wires are fixedly connected to the coarse brush mounting blocks, and the other ends of the coarse brush steel wires extend into the inner cavity of the rotary drum; the two homogenizing rollers are respectively positioned at two sides of the rough brush steel wire; the homogenizing roller is connected to the coarse brush mounting block through an elastic telescopic structure, and the fine brush module comprises a fine brush mounting block and a fine brush sand block. The deep rust removing equipment for the outer surface of the steel pipe not only can thoroughly remove iron rust on the surface of the steel pipe and has good rust removing quality, but also has the advantages of simple structure, small occupied volume, low cost, easy wide application and the like.)

1. The deep rust removing equipment for the outer surface of the steel pipe is characterized by comprising a chemical rust removing device and a mechanical rust removing device, wherein the mechanical rust removing device is positioned behind the chemical rust removing device along the conveying direction of the steel pipe; the chemical rust removal device comprises an atomizing head and a spray box, wherein the atomizing head is arranged in the spray box and is communicated with a conveying pipeline for providing rust removal liquid;

the mechanical rust removing device comprises a rotary drum, a rust brushing module arranged on the rotary drum and a rotary driving mechanism used for driving the rotary drum to rotate, and the rotary drum is rotatably connected to the rack; the circumferential surface of the rotary cylinder is provided with a plurality of rust brushing mounting openings which are uniformly distributed along the circumferential direction; the rust brushing module comprises at least two rough brush modules and at least two fine brush modules, and the rough brush modules and the fine brush modules are arranged at different rust brushing mounting openings at intervals along the circumferential direction;

the rough brush module comprises a rough brush mounting block, a plurality of rough brush steel wires and a homogenizing roller, the rough brush mounting block is mounted on the outer circular surface of the rotary drum through a detachable structure, one end of each rough brush steel wire is fixedly connected to the rough brush mounting block, and the other end of each rough brush steel wire extends into the inner cavity of the rotary drum;

the two homogenizing rollers are respectively positioned at two sides of the rough brush steel wire, and the axes of the homogenizing rollers are parallel to the axis of the rotating cylinder; the homogenizing roller is connected to the coarse brush mounting block through an elastic telescopic structure, the elastic telescopic structure comprises a mounting column, a telescopic spring and a mounting hole, the mounting hole is formed in the coarse brush mounting block, one end of the mounting column extends into the mounting hole, and the other end of the mounting column is rotatably connected with the homogenizing roller; the mounting post is provided with a limiting part with a larger diameter, the limiting part is positioned in the mounting hole, the telescopic spring is sleeved at one end of the mounting post extending to the mounting hole, and two ends of the telescopic spring are respectively abutted against the bottom surfaces of the limiting part and the limiting part; in a natural state, the height of the homogenizing roller is higher than that of the rough brush steel wire;

the fine brush module comprises a fine brush mounting block and a fine brush sand block, and the fine brush mounting block is mounted on the outer circular surface of the rotary cylinder through a detachable structure; one end of the fine brush sand block is fixed on the fine brush mounting block, the other end of the fine brush sand block is provided with a fine brush sand surface with the density larger than the distribution density of the coarse brush steel wires, and the fine brush sand surface is positioned in the inner cavity of the rotary cylinder.

2. The deep rust removal device for the outer surface of the steel pipe as claimed in claim 1, wherein a recycling tank is arranged below the spray tank, and a recycling hopper is arranged between the recycling tank and the spray tank.

3. The deep rust removal device for the outer surface of the steel pipe as claimed in claim 1, further comprising a cleaning device comprising a plurality of cleaning soft brushes uniformly distributed along the circumferential direction, wherein the cleaning soft brushes are connected to the end of the rotary cylinder far away from the chemical rust removal device through an elastic mounting structure.

4. The deep rust removal device for the outer surface of the steel pipe as claimed in claim 3, wherein the elastic mounting structure comprises a fixed block, a mounting rod and a mounting seat, and the fixed block is fixedly connected to the rotary cylinder; the cleaning soft brush is fixed on the mounting seat through a detachable drawer, one end of the mounting rod is fixed on the mounting seat, and the other end of the mounting rod slidably penetrates through the fixing block and is limited on one side, far away from the mounting seat, of the fixing block through the limiting connecting part; the mounting rod is sleeved with a mounting spring, and two ends of the mounting spring are abutted against the fixing block and the mounting seat.

5. The deep rust removing device for the outer surface of the steel pipe as claimed in claim 1, wherein a discharging gap for transferring rust to the outside of the rotary drum is formed between the rust brushing mounting port and the coarse brush mounting block and between the rust brushing mounting port and the fine brush mounting block.

6. The deep rust removing device for the outer surface of the steel pipe as claimed in claim 1 or 5, wherein the rust brushing mounting port is provided with two first positioning surfaces extending in the radial direction of the rotary cylinder, and an included angle between the two first positioning surfaces is an acute angle;

the both ends of thick brush installation piece and thin brush installation piece all are equipped with location portion, are equipped with the second locating surface with locating surface complex on this location portion.

7. The deep rust removing device for the outer surface of the steel pipe as claimed in claim 1, wherein the rotary driving mechanism comprises a rotary driving motor and a rotary transmission assembly, and the rotary driving motor is fixedly arranged on the frame.

Technical Field

The invention relates to steel pipe derusting equipment, in particular to steel pipe outer surface deep derusting equipment.

Background

Along with the continuous development of society and the continuous construction of various projects, the demand of steel pipes is more and more, and the application of the steel pipes plays an increasingly important role in the increase of national economy in China.

The steel pipe is corroded by air after being stored for a long time, rust can appear on the outer surface of the steel pipe, the steel pipe with the rust can not be directly applied, and further application can be carried out only after rust removal treatment. Although a very good treatment effect can be achieved, the production and rust removal processing costs are high, special workshop sites are required, and the wide application and popularization are not facilitated.

Disclosure of Invention

The invention aims to overcome the existing problems and provides the steel pipe outer surface deep rust removing device which not only can completely remove the iron rust on the surface of the steel pipe to achieve the effect of deep rust removal and has better rust removing quality, but also has the advantages of simple structure, small occupied volume, low cost, easy wide application and the like.

The purpose of the invention is realized by the following technical scheme:

the deep rust removing equipment for the outer surface of the steel pipe comprises a chemical rust removing device and a mechanical rust removing device, wherein the mechanical rust removing device is positioned behind the chemical rust removing device along the conveying direction of the steel pipe; the chemical rust removal device comprises an atomizing head and a spray box, wherein the atomizing head is arranged in the spray box and is communicated with a conveying pipeline for providing rust removal liquid;

the mechanical rust removing device comprises a rotary drum, a rust brushing module arranged on the rotary drum and a rotary driving mechanism used for driving the rotary drum to rotate, and the rotary drum is rotatably connected to the rack; the circumferential surface of the rotary cylinder is provided with a plurality of rust brushing mounting openings which are uniformly distributed along the circumferential direction; the rust brushing module comprises at least two rough brush modules and at least two fine brush modules, and the rough brush modules and the fine brush modules are arranged at different rust brushing mounting openings at intervals along the circumferential direction;

the rough brush module comprises a rough brush mounting block, a plurality of rough brush steel wires and a homogenizing roller, the rough brush mounting block is mounted on the outer circular surface of the rotary drum through a detachable structure, one end of each rough brush steel wire is fixedly connected to the rough brush mounting block, and the other end of each rough brush steel wire extends into the inner cavity of the rotary drum;

the two homogenizing rollers are respectively positioned at two sides of the rough brush steel wire, and the axes of the homogenizing rollers are parallel to the axis of the rotating cylinder; the homogenizing roller is connected to the coarse brush mounting block through an elastic telescopic structure, the elastic telescopic structure comprises a mounting column, a telescopic spring and a mounting hole, the mounting hole is formed in the coarse brush mounting block, one end of the mounting column extends into the mounting hole, and the other end of the mounting column is rotatably connected with the homogenizing roller; the mounting post is provided with a limiting part with a larger diameter, the limiting part is positioned in the mounting hole, the telescopic spring is sleeved at one end of the mounting post extending to the mounting hole, and two ends of the telescopic spring are respectively abutted against the bottom surfaces of the limiting part and the limiting part; in a natural state, the height of the homogenizing roller is higher than that of the rough brush steel wire;

the fine brush module comprises a fine brush mounting block and a fine brush sand block, and the fine brush mounting block is mounted on the outer circular surface of the rotary cylinder through a detachable structure; one end of the fine brush sand block is fixed on the fine brush mounting block, the other end of the fine brush sand block is provided with a fine brush sand surface with the density larger than the distribution density of the coarse brush steel wires, and the fine brush sand surface is positioned in the inner cavity of the rotary cylinder.

The working principle of the deep rust removing equipment for the outer surface of the steel pipe is as follows:

during operation, the steel pipe is conveyed into the spray box through the conveying device, the atomizing head communicated with the conveying pipeline for providing the rust removing liquid sprays the rust removing liquid on the outer surface of the steel pipe, the rust removing liquid corrodes the iron rust on the outer surface of the steel pipe in advance, and part of stubborn iron rust is removed. Then the steel pipe is conveyed into the inner cavity of the rotary drum, the rotary driving mechanism drives the rotary drum to rotate, and the rotary drum drives the thick brush module and the thin brush module to rotate. In the rotating process, the plurality of rough brushing steel wires scrape and brush the outer surface of the steel pipe, the surface of the steel pipe is roughly scraped, and the outer surface of the steel pipe is finely brushed by the fine brushing surface of the fine brushing sand block, so that the rust is completely and thoroughly removed.

Furthermore, two homogenization rollers are respectively arranged on two sides of the rough brush steel wire and connected to the rough brush mounting block through an elastic telescopic structure, and the homogenization rollers are higher than the rough brush steel wire in a natural state. After the steel pipe got into the inner chamber of a rotatory section of thick bamboo, the thick brush steel wire all pastes the surface at the steel pipe with the homogenization cylinder, in the rotatory in-process that carries out the rust cleaning to the steel pipe of thick brush steel wire, the homogenization cylinder rolls at the surface of steel pipe, along direction of rotation, the homogenization cylinder that is located thick brush steel wire rear not only can carry out spacingly to the thick brush steel wire, prevent that the thick brush steel wire from receiving the extrusion and too big angle of backward slope, guarantee that the thick brush steel wire has sufficient intensity to accomplish the rust cleaning work, can also homogenize the rust cleaning liquid simultaneously, thereby obtain more high-efficient and thorough rust cleaning effect. Wherein, after chemical rust removal, the outer surface of the steel pipe is provided with rust removing liquid, and because the distributed clearance of the rough brush steel wires is larger, the rough brush steel wires brush the outer surface of the steel pipe like a rake, so that a plurality of pits are dug on the rust layer on the surface, when the pits are excavated, the rust removing liquid which is originally uniformly distributed on the outer surface of the steel pipe is poked by the rough brushing steel wires, so that the inner rust on the position is exposed, then the homogenization roller positioned behind the rough brush steel wire rolls the position of the pit, and the stirred rust removing liquid is uniformly paved on the outer surface (rust layer) of the steel pipe again, so that the rust removing liquid enters the pit and contacts with the rust in the pit, so as to corrode, and then the fine brushing sand surface with higher density is used for finely brushing the corroded iron rust layer, so as to deeply derust, thereby completely removing the iron rust.

In a preferred embodiment of the present invention, a recycling bin is provided below the spray bin, and a recycling hopper is provided between the recycling bin and the spray bin. Through the structure, the rust removing liquid and other reaction substances in the spray box can be uniformly recovered into the recycling box and collected or recycled by the recycling box.

In a preferred embodiment of the present invention, a discharge gap for transferring rust to the outside of the rotary drum is provided between the rust brushing mounting opening and each of the rough brush mounting block and the fine brush mounting block.

The invention also comprises a cleaning device which comprises a plurality of cleaning soft brushes uniformly distributed along the circumferential direction, wherein the cleaning soft brushes are connected to the end part of the rotary drum far away from the chemical rust removing device through an elastic mounting structure. After the steel pipe is brushed coarsely and brushed finely, the iron rust on the surface of the steel pipe is basically and completely removed, and residual rust scraps and waste liquid are left.

Preferably, the elastic mounting structure comprises a fixing block, a mounting rod and a mounting seat, and the fixing block is fixedly connected to the rotary cylinder; the cleaning soft brush is fixed on the mounting seat through a detachable drawer, one end of the mounting rod is fixed on the mounting seat, and the other end of the mounting rod slidably penetrates through the fixing block and is limited on one side, far away from the mounting seat, of the fixing block through the limiting connecting part; the mounting rod is sleeved with a mounting spring, and two ends of the mounting spring are abutted against the fixing block and the mounting seat. Therefore, the cleaning soft brush can be attached to the surface of the steel pipe in a self-adaptive mode according to the actual size of the steel pipe, and therefore the steel pipe can be cleaned in place.

In a preferable aspect of the present invention, the rust brushing mounting port is provided with two first positioning surfaces extending in a radial direction of the rotary drum, and an included angle between the two first positioning surfaces is an acute angle;

the both ends of thick brush installation piece and thin brush installation piece all are equipped with location portion, are equipped with the second locating surface with locating surface complex on this location portion. Through above-mentioned structure, when changing thick brush module or thin brush module, during the staff directly advances the location portion card brush rust installing port, after the cooperation is pasted with first locating surface automatically to the second locating surface of location portion, accomplish positioning work promptly, it is very convenient to operate, and rethread screw will thick brush installation piece and thin brush installation piece locking can.

In a preferred embodiment of the present invention, the rotation driving mechanism includes a rotation driving motor and a rotation transmission assembly, and the rotation driving motor is fixedly disposed on the frame. Specifically, the rotary transmission assembly is a synchronous belt transmission assembly.

Compared with the prior art, the invention has the following beneficial effects:

1. the deep rust removing equipment for the outer surface of the steel pipe, disclosed by the invention, not only can thoroughly remove the iron rust on the surface of the steel pipe and has better rust removing quality, but also has the advantages of simple structure, small occupied volume, low cost, easiness in wide application and the like.

2. Through set up the homogenization cylinder in the both sides of scrubbing steel wire, and the homogenization cylinder passes through elastic telescopic structure to be connected on the scrubbing installation piece, under natural state, the height that homogenizes the cylinder is higher than the height of scrubbing steel wire. After the steel pipe got into the inner chamber of a rotatory section of thick bamboo, the thick brush steel wire all pastes the surface at the steel pipe with the homogenization cylinder, in the rotatory in-process that carries out the rust cleaning to the steel pipe of thick brush steel wire, the homogenization cylinder rolls at the surface of steel pipe, along direction of rotation, the homogenization cylinder that is located thick brush steel wire rear not only can carry out spacingly to the thick brush steel wire, prevent that the thick brush steel wire from receiving the extrusion and too big angle of backward slope, guarantee that the thick brush steel wire has sufficient intensity to accomplish the rust cleaning work, can also homogenize the rust cleaning liquid simultaneously, thereby obtain more high-efficient and thorough rust cleaning effect.

3. The detachable structure is used for arranging the rough brush module and the fine brush module at the derusting mounting opening to form a modularized mounting structure, so that the modules can be conveniently detached and cleaned, and other replaceable derusting modules can be replaced.

4. The invention adopts a mode of combining chemical rust removal and mechanical rust removal, and carries out pretreatment in a chemical mode and then treatment in a mechanical mode, thereby achieving the effect of deep rust removal, being capable of removing various stubborn iron rust and having extremely high rust removal rate.

Drawings

Fig. 1-2 are schematic perspective views of two different viewing angles of the deep rust removal device for the outer surface of the steel pipe in the invention.

Fig. 3 is a front view of a mechanical rust removing apparatus and a cleaning apparatus in the present invention.

Fig. 4 is a side view of a mechanical rust removing apparatus and a cleaning apparatus in the present invention.

Fig. 5 is a side view of the mechanical rust removing apparatus in the present invention.

Fig. 6 is a schematic perspective view of a rough brush module according to the present invention.

FIG. 7 is a side view of a brusher module of the present invention.

Fig. 8 is a sectional view taken along the line a-a in fig. 7.

Fig. 9 is a side view of two sets of brusher modules of the present invention undergoing a brusher operation.

Fig. 10 is a perspective view of the cleaning device of the present invention.

Detailed Description

In order to make those skilled in the art understand the technical solutions of the present invention well, the following description of the present invention is provided with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Referring to fig. 1-2, the deep rust removing apparatus for the outer surface of the steel pipe in the present embodiment includes a chemical rust removing device, a mechanical rust removing device, and a cleaning device, and the mechanical rust removing device is located behind the chemical rust removing device along the conveying direction of the steel pipe; the chemical rust removing device comprises an atomizing head 1 and an atomizing box 2, wherein the atomizing head 1 is arranged in the atomizing box 2 and is communicated with a conveying pipeline for providing rust removing liquid.

Referring to fig. 1-9, the mechanical rust removing device includes a rotary drum 3, a rust brushing module disposed on the rotary drum 3, and a rotary driving mechanism for driving the rotary drum 3 to rotate, the rotary driving mechanism includes a rotary driving motor 4 and a rotary transmission assembly, and the rotary driving motor 4 is fixedly disposed on a frame 5. Specifically, the rotary transmission assembly is a synchronous belt transmission assembly. The rotary drum 3 is rotatably connected to the frame 5; a plurality of rust brushing mounting openings 3-1 which are uniformly distributed along the circumferential direction are formed in the circumferential surface of the rotary cylinder 3; the rust brushing module comprises two rough brush modules and two fine brush modules, and the rough brush modules and the fine brush modules are arranged at different rust brushing mounting openings 3-1 at intervals along the circumferential direction.

Referring to fig. 5 to 9, the rough brush module includes a rough brush mounting block 6, a plurality of rough brush wires 7, and a homogenizing roller 8, the rough brush mounting block 6 is mounted on the outer circumferential surface of the rotary drum 3 by a detachable structure, the rough brush wires 7 are provided, one end of the rough brush wire 7 is fixedly connected to the rough brush mounting block 6, and the other end extends into the inner cavity of the rotary drum 3.

Referring to fig. 5-9, the homogenizing roller 8 is provided with two homogenizing rollers 8, two homogenizing rollers 8 are respectively positioned at two sides of the coarse brush steel wire 7, and the axis of the homogenizing roller 8 is parallel to the axis of the rotary drum 3; the homogenizing roller 8 is connected to the rough brush mounting block 6 through an elastic telescopic structure, the elastic telescopic structure comprises a mounting column 9, a telescopic spring 10 and a mounting hole 6-1, the mounting hole 6-1 is formed in the rough brush mounting block 6, one end of the mounting column 9 extends into the mounting hole 6-1, and the other end of the mounting column is rotatably connected with the homogenizing roller 8; the mounting column 9 is provided with a limiting part 9-1 with a larger diameter, the limiting part 9-1 is positioned in the mounting hole 6-1, the telescopic spring 10 is sleeved on one end of the mounting column 9 extending to the mounting hole 6-1, and two ends of the telescopic spring 10 are respectively abutted against the bottom surfaces of the limiting part 9-1 and the limiting part 9-1; in the natural state, the level of the leveling cylinder 8 is higher than the level of the raw wire 7.

Referring to fig. 1 to 5, the fine brush module includes a fine brush mounting block 11 and a fine brush sand block 12, the fine brush mounting block 11 being mounted on the outer circumferential surface of the spin basket 3 by a detachable structure; one end of the fine brush sand block 12 is fixed on the fine brush installation block 11, and the other end is provided with a fine brush sand surface with the density larger than that of the coarse brush steel wires 7, and the fine brush sand surface is positioned in the inner cavity of the rotary drum 3. And an avoiding structure for avoiding the forward conveying of the steel pipe is arranged at one end of the homogenizing roller 8 and one end of the fine sand brushing block 12 close to the chemical rust removing device.

Further, a discharging gap for transferring the iron rust to the outside of the rotary drum 3 is arranged between the rust brushing mounting opening 3-1 and the rough brush mounting block 6 and the fine brush mounting block 11.

Referring to fig. 1-2, a recycling tank 13 is provided below the spray tank 2, and a recycling hopper 14 is provided between the recycling tank 13 and the spray tank 2. Through the structure, the rust removing liquid and other reaction substances in the spray box 2 can be uniformly recovered into the recycling box 13 and collected or recycled by the recycling box 13.

Referring to fig. 1-4 and 10, the cleaning device comprises a plurality of cleaning soft brushes 15 uniformly distributed along the circumferential direction, and the cleaning soft brushes 15 are connected to the end of the rotary drum 3 far away from the chemical rust removing device through an elastic mounting structure. After the steel pipe is brushed coarsely and brushed finely, the iron rust on the surface of the steel pipe is basically and completely removed, and residual rust scraps and waste liquid are left.

Further, the elastic mounting structure comprises a fixed block 16, a mounting rod 17 and a mounting seat 18, wherein the fixed block 16 is fixedly connected to the rotary drum 3; the cleaning soft brush 15 is fixed on the mounting seat 18 through a detachable drawer, one end of the mounting rod 17 is fixed on the mounting seat 18, the other end of the mounting rod 17 slidably penetrates through the fixed block 16, and the cleaning soft brush is limited on one side, far away from the mounting seat 18, of the fixed block 16 through a limiting connecting part 17-1; the mounting rod 17 is sleeved with a mounting spring 19, and two ends of the mounting spring 19 are abutted against the fixing block 16 and the mounting seat 18. In this way, the cleaning soft brush 15 can be attached to the surface of the steel pipe in a self-adaptive manner according to the actual size of the steel pipe, so that the steel pipe can be cleaned in place.

Referring to fig. 5-9, the rust brushing mounting port 3-1 is provided with two first positioning surfaces 3-1-1 extending in the radial direction of the rotary drum 3, and an included angle between the two first positioning surfaces 3-1-1 is an acute angle; the two ends of the coarse brush mounting block 6 (the fine brush mounting block 11) are respectively provided with a positioning part 6-2, and the positioning parts 6-2 are provided with second positioning surfaces 6-2-1 matched with the positioning surfaces. Through the structure, when the thick brush module or the thin brush module is replaced, a worker directly clamps the positioning part 6-2 into the rust brushing mounting opening 3-1, and after the second positioning surface 6-2-1 of the positioning part 6-2 is automatically attached to and matched with the first positioning surface 3-1-1, positioning work is completed, operation is very convenient, and the thick brush mounting block 6 and the thin brush mounting block 11 are locked through screws.

Referring to fig. 1 to 10, the working principle of the deep rust removing device for the outer surface of the steel pipe in the embodiment is as follows:

during operation, the steel pipe is conveyed into the spray box 2 through the conveying device, the atomizing head 1 communicated with a conveying pipeline for providing the rust removing liquid sprays the rust removing liquid on the outer surface of the steel pipe, the rust removing liquid corrodes the iron rust on the outer surface of the steel pipe in advance, and part of stubborn iron rust is removed. Then, the steel pipe is conveyed into the inner cavity of the rotary drum 3, the rotary driving mechanism drives the rotary drum 3 to rotate (according to actual needs, the rotary drum 3 rotates forward and backward), and the rotary drum 3 drives the coarse brush module and the fine brush module to rotate. In the rotating process, the plurality of rough brushing steel wires 7 scrape and brush the outer surface of the steel pipe, the surface of the steel pipe is roughly scraped, and the outer surface of the steel pipe is finely brushed by the fine brushing surface of the fine brushing sand block 12, so that the rust is completely and thoroughly removed.

Further, two homogenization rollers 8 are respectively arranged on two sides of the rough brush steel wire 7, and the homogenization rollers 8 are connected to the rough brush mounting block 6 through an elastic telescopic structure, so that the homogenization rollers 8 are higher than the rough brush steel wire 7 in a natural state. After the steel pipe got into the inner chamber of rotary drum 3, thick brush steel wire 7 and homogenization cylinder 8 all pasted tightly at the surface of steel pipe, in the rotatory in-process that carries out the rust cleaning to the steel pipe of thick brush steel wire 7, homogenization cylinder 8 rolls at the surface of steel pipe, along direction of rotation, homogenization cylinder 8 that is located thick brush steel wire 7 rear not only can carry out spacingly to thick brush steel wire 7, prevent that thick brush steel wire 7 from receiving the extrusion and too big angle of backward slope, guarantee that thick brush steel wire 7 has sufficient intensity to accomplish the rust cleaning work, can also homogenize the rust cleaning liquid simultaneously, thereby obtain more high-efficient and thorough rust cleaning effect. After chemical rust removal, the outer surface of the steel pipe is provided with a rust removing liquid, the rough brush steel wires 7 brush the outer surface of the steel pipe like a rake due to the large distribution gap of the rough brush steel wires 7, so that a plurality of pits are dug on a rust layer on the surface, the rust removing liquid originally uniformly distributed on the outer surface of the steel pipe is poked by the rough brush steel wires 7 while the pits are dug, so that internal rust on the positions is exposed, then a homogenizing roller 8 positioned behind the rough brush steel wires 7 rolls the positions of the pits, the poked rust removing liquid is uniformly and flatly paved on the outer surface (the rust layer) of the steel pipe again, so that the rust removing liquid enters the pits to be in contact with the internal rust for corrosion, and then fine brush sand surfaces with higher density are used for finely grinding and brushing the corroded rust layer, so that the rust is completely removed.

The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.