A steel pipe surface treatment process

Abstract

The application discloses a steel pipe surface treatment process and relates to the technical field of steel pipes. The application comprises the following steps: S1: heating sand blasting, the internal temperature of a quenching furnace is increased to 800 DEG C, a steel pipe is placed in the quenching furnace for heating, and then the surface of the steel pipe is sand blasted and rusted by a sand blasting machine; S2: cooling and heat preservation, the surface of the steel pipe is blown dry by nitrogen, the temperature of the steel pipe is cooled to 300 DEG C and heat preservation is carried out for 2 hours, and in the heat preservation process, polyethylene powder paint is sprayed on the surface of the steel pipe. The application can effectively avoid the surface of the steel pipe from being eroded by high temperature, low temperature and humid environment, prevent rust layer and cracks from appearing on the surface of the steel pipe, ensure normal use of the steel pipe, prolong the service life of the steel pipe, and when the surface of the steel pipe is polished, different inner diameters of the steel pipe can be fixed by a fixing piece, three sliding rods are driven to slide synchronously by a driving piece, and then the polishing piece, the collecting piece and the heat dissipation piece are driven to move synchronously.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steel pipes, in particular to a steel pipe surface treatment process. BACKGROUND

[0002] The steel pipe is a kind of hollow cylindrical steel material, which has a hollow section and a length much larger than the diameter or circumference. The steel pipe is not only used for conveying fluid and powder solid, exchanging heat energy, and manufacturing mechanical parts and containers, but also is an economical steel material.

[0003] In the prior art, the steel pipe exposed to the outside for a long time will be eroded by high temperature, low temperature and humid environment, so that a rust layer and cracks will appear on the surface of the steel pipe, which not only affects the normal use of the steel pipe, but also reduces the service life of the steel pipe. Meanwhile, the smoothness of the surface of the steel pipe has certain requirements during use, so it is necessary to polish the surface of the steel pipe by a polishing device. The existing polishing device is difficult to be applicable to steel pipes of different sizes, and has poor applicability and flexibility. In the polishing process, waste materials are easily left on the surface of the steel pipe, thereby causing scratches on the surface of the steel pipe. Meanwhile, the surface of the steel pipe is easily damaged due to too high temperature in the polishing process. Therefore, the steel pipe surface treatment process is provided.

[0004] CONTENT

[0005] The application aims to solve the problems in the background art and provides a steel pipe surface treatment process.

[0006] In order to achieve the above-mentioned purpose, the application specifically adopts the following technical scheme:

[0007] A steel pipe surface treatment process comprises the following steps:

[0008] S1: heating and sand blasting, the temperature in the quenching furnace is increased to 800 DEG C, the steel pipe is placed in the quenching furnace for heating, and then the surface of the steel pipe is sand blasted and rusted by a sand blasting machine;

[0009] S2: cooling and heat preservation, the surface of the steel pipe is dried by nitrogen, so that the temperature of the steel pipe is cooled to 300 DEG C and heat preserved for 2 hours. In the heat preservation process, polyethylene powder coating is sprayed on the surface of the steel pipe;

[0010] S3: pickling, the steel pipe is soaked in an acidic solution, and the soaking time depends on the concentration of the acidic solution;

[0011] S4: washing and drying, the steel pipe is taken out from the pickling solution and washed by clean water, and then dried to remove excess water;

[0012] In the above-mentioned steel pipe surface treatment process, a special device is needed to polish the surface of the steel pipe. The special device comprises:

[0013] a base;

[0014] a rotating rod and a screw rod, both horizontally rotating and arranged on the base and distributed vertically, and both rotating synchronously under driving;

[0015] a fixing member, arranged on the rotating rod and used for fixing or releasing the steel pipe;

[0016] a sliding block, horizontally sliding and arranged on the base and threadedly matched with the screw rod;

[0017] a fixing ring, vertically arranged on the sliding block and located outside the rotating rod;

[0018] three sliding rods, all sliding and arranged on the fixing ring and distributed in an annular array;

[0019] a driving member, arranged on the fixing ring and the three sliding rods, and used for driving the three sliding rods to slide synchronously;

[0020] a polishing member and a collecting member, both arranged on the two sliding rods located at the bottom, the polishing member being used for polishing the surface of the steel pipe, and the collecting member being used for collecting the waste generated in the polishing;

[0021] a heat dissipation member, arranged on the fixing ring and the sliding rod located at the top and used for dissipating heat from the surface of the steel pipe.

[0022] By adopting the above technical scheme, the surface of the steel pipe can be effectively prevented from being eroded by high temperature, low temperature and humid environment, and the surface of the steel pipe can be prevented from rusting and cracking, so as to ensure normal use of the steel pipe and prolong the service life of the steel pipe. The fixing member can be used for fixing the steel pipe with different inner diameters, and the driving member can be used for driving the three sliding rods to slide synchronously, so as to drive the polishing member, the collecting member and the heat dissipation member to move synchronously, thereby polishing the surface of the steel pipe with different sizes, improving the applicability and use flexibility, collecting the waste generated in the polishing by the collecting member to avoid the waste remaining on the surface of the steel pipe and causing scratches on the surface of the steel pipe, and dissipating heat from the surface of the steel pipe by the heat dissipation member to avoid damage to the surface of the steel pipe due to high temperature in the polishing process.

[0023] Further, the application further comprises:

[0024] a driving motor, arranged on the base and having an output shaft connected with the free end of the screw rod;

[0025] a first pulley and a second pulley, both arranged on the same end of the rotating rod and the screw rod;

[0026] A connecting belt is arranged around the first pulley and the second pulley.

[0027] By adopting the technical scheme, when in use, the driving motor is turned on, the output shaft of the driving motor rotates, drives the screw rod and the second pulley to rotate synchronously, the connecting belt rotates with the second pulley and drives the first pulley and the rotating rod to rotate synchronously.

[0028] Further, the transmission ratio of the first pulley and the second pulley is 3:1.

[0029] By adopting the technical scheme, the sliding speed of the sliding block can be slowed down to a certain extent, so as to slow down the sliding block and polish the surface of the steel pipe more uniformly.

[0030] Further, the fixing member comprises:

[0031] Three fixing plates are arranged in an annular array on the outer circumferential side of the rotating rod, and the fixing plates are provided with arc-shaped plates;

[0032] A screw cylinder is arranged on the rotating rod in a horizontal direction through a bearing;

[0033] A movable block is threadedly sleeved on the screw cylinder, and the movable block is hingedly provided with three first movable rods arranged in an annular array, and free ends of the three first movable rods are respectively hingedly connected to the three fixing plates;

[0034] A fixed block is sleeved on the rotating rod, and the fixed block is hingedly provided with three second movable rods arranged in an annular array, and middle portions of the three second movable rods are respectively hingedly connected to middle portions of the three first movable rods, and free ends of the three second movable rods are respectively slidingly hingedly connected to the three fixing plates.

[0035] By adopting the technical scheme, when the screw cylinder rotates in a forward direction, the movable block moves in a horizontal direction to be close to the second plate due to the thread action of the screw cylinder, the three first movable rods synchronously rotate around the respective hinged points to be close to the vertical direction, at this time, the three second movable rods also synchronously rotate around the respective hinged points to be close to the vertical direction, the free ends of the three second movable rods respectively slide in the three waist holes, the three fixing plates synchronously move to be away from the rotating rod, the three arc-shaped plates synchronously move with the three fixing plates, until the outer surfaces of the three arc-shaped plates are attached to the inner side walls of the steel pipe, so as to fix the steel pipe, and vice versa.

[0036] Further, the free ends of the three arc-shaped plates are respectively provided with limiting blocks.

[0037] By adopting the technical scheme, the steel pipe can be prevented from contacting the base, so as to avoid friction between the steel pipe and the base when the steel pipe rotates.

[0038] Further, the driving member comprises:

[0039] three rotating discs, each eccentrically hinged on the fixed ring and arranged in an annular array;

[0040] three fixed rods, each arranged on a rotating disc and hingedly connected to a sliding rod at a free end;

[0041] two first connecting rods, each arranged on a rotating disc;

[0042] a second connecting rod arranged on another rotating disc;

[0043] two third connecting rods arranged in an annular array, one end of one third connecting rod being hingedly connected to a free end of a first connecting rod, and the other end of the third connecting rod being hingedly connected to the other end of the first connecting rod and a free end of the second connecting rod;

[0044] an electric push rod, a fixed end of which is hingedly connected to the fixed ring, and a free end of which is hingedly connected to the other end of the first connecting rod.

[0045] Further, the polishing member comprises:

[0046] a connecting rod arranged on the sliding rod;

[0047] a connecting plate arranged at a free end of the connecting rod and configured in an arc shape;

[0048] a polishing abrasive paper arranged on an inner side of the connecting plate.

[0049] By adopting the above technical scheme, the polishing abrasive paper is always in contact with the surface of the steel pipe when the steel pipe rotates, so as to polish the outer surface of the steel pipe.

[0050] Further, the collecting member comprises:

[0051] a collecting cylinder arranged on the sliding rod;

[0052] a rubber scraper arranged at a free end of the collecting cylinder and configured in an arc shape;

[0053] a plug-in groove and a positioning hole, both of which are arranged on the sliding rod and in communication with each other;

[0054] a plug-in block arranged on the collecting cylinder and in close plug-in cooperation with the plug-in groove, a threaded hole being arranged through the plug-in block;

[0055] a bolt in plug-in cooperation with the positioning hole and in threaded cooperation with the threaded hole.

[0056] By adopting the technical scheme, the rubber scraper plate is always in contact with the surface of the steel pipe when the steel pipe rotates, so that the waste on the surface of the steel pipe is scraped off and collected, and the scraped-off waste enters the collecting cylinder, so as to avoid that the waste remains on the surface of the steel pipe during polishing, thereby causing scratches on the surface of the steel pipe. With the passage of time, the waste in the collecting cylinder will also increase, at which time the collecting cylinder needs to be detached from the slide rod, and the waste in the collecting cylinder is poured out. The specific operation is as follows. The bolt is loosened by means of a tool until the collecting cylinder is away from the slide rod, and the insertion block is separated from the insertion slot. Then the waste in the collecting cylinder is poured out and the inside of the collecting cylinder is cleaned. After that, the collecting cylinder is reinstalled on the slide rod. The specific operation is as follows. The insertion block is tightly inserted into the insertion slot until the positioning hole and the threaded hole are communicated. The bolt is inserted into the positioning hole and tightened by means of a tool, so that the bolt and the threaded hole are threadedly connected.

[0057] Further, the heat dissipation member comprises:

[0058] A water storage tank is arranged on the fixed ring, and the water storage tank is communicated with the water inlet pipe and the water outlet pipe.

[0059] A storage tank is arranged on the slide rod, the free end of the water outlet pipe is communicated with the inside of the storage tank, and the bottom of the storage tank is rotatably arranged with a sponge roller through a bearing.

[0060] By adopting the technical scheme, when the steel pipe rotates, the sponge roller rotates together, and the water in the storage tank continuously wets the sponge roller. The sponge roller that is continuously wetted cools and heats the surface of the steel pipe. The water in the water storage tank continuously flows into the storage tank through the water outlet pipe, so as to cool and heat the surface of the steel pipe, so as to avoid that the surface of the steel pipe is damaged due to high temperature during polishing.

[0061] The surface of the steel pipe is polished by using the special device, which comprises the following steps:

[0062] S101: Steel pipe fixing, the steel pipe is kept in a horizontal direction and located on the outer periphery side of the rotating rod, and the steel pipe is fixed by the fixing member;

[0063] S102: Polishing treatment, the three slide rods are driven to slide synchronously by the driving member, the polishing member, the collecting member and the heat dissipation member move synchronously with the three slide rods, until the polishing sandpaper, the rubber scraper plate and the sponge roller are all attached to the surface of the steel pipe. The rotating rod and the screw rod are driven to rotate synchronously, the fixed steel pipe rotates together with the rotating rod, the sliding block slides on the base and drives the fixed ring to move together. The surface of the steel pipe is polished by the polishing member, the waste generated during polishing is collected by the collecting member, and the surface of the steel pipe is cooled and heated by the heat dissipation member.

[0064] S103: The steel pipe is fixed by the fixing piece, and the polished steel pipe is taken away.

[0065] The beneficial effects of the present application are as follows: the present application can effectively prevent the surface of the steel pipe from being eroded by high temperature, low temperature and humid environment, prevent the surface of the steel pipe from appearing rust layer and cracks, ensure the normal use of the steel pipe, and also prolong the service life of the steel pipe. When polishing the surface of the steel pipe, the fixing piece can be used to fix the steel pipe with different inner diameters, and the three sliding rods are driven to slide synchronously by the driving piece, so as to drive the polishing piece, the collecting piece and the heat dissipation piece to move synchronously, thereby the surface of the steel pipe with different sizes can be polished, thereby improving the applicability and use flexibility. At the same time, the waste generated by polishing is collected by the collecting piece, so as to avoid the waste remaining on the surface of the steel pipe during polishing, thereby causing scratches on the surface of the steel pipe. The surface of the steel pipe is cooled by the heat dissipation piece, so as to avoid damage to the surface of the steel pipe due to high temperature during polishing, so the present application is more practical. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 is a process flow chart of the present application;

[0067] Figure 2 is a structure perspective view of the special device of the present application;

[0068] Figure 3 is an exploded perspective view of part of the structure of the special device of the present application;

[0069] Figure 4 is an enlarged view of A in the present application; Figure 3

[0070] Figure 5 is a perspective view of part of the structure of the special device of the present application;

[0071] Figure 6 is an enlarged view of B in the present application; Figure 5

[0072] Figure 7 is an exploded perspective view of another part of the structure of the special device of the present application;

[0073] Figure 8 is a perspective view of part of the structure of the special device of the present application;

[0074] Figure 9 is a perspective view of the present application; Figure 8

[0075] ​​​Reference numerals: 1. Base; 2. Rotating rod; 3. Lead screw; 4. Fixing component; 401. Fixing plate; 402. Arc-shaped plate; 403. Screw barrel; 404. Movable block; 405. First movable rod; 406. Fixing block; 407. Second movable rod; 408. Limiting block; 5. Sliding block; 6. Fixing ring; 7. Slide rod; 8. Driving component; 801. Turntable; 802. Fixing rod; 803. First connecting rod; 804. Second connecting rod; 805. Third connecting rod; 806. Electric push rod; 9. Polished part; 901. 902. Connecting rod; 903. Connecting plate; 904. Polishing sandpaper; 10. Collecting component; 1005. Collecting cylinder; 1006. Rubber scraper; 1007. Insertion groove; 1008. Positioning hole; 1009. Insertion block; 10000. Threaded hole; 1001. Bolt; 11. Heat dissipation component; 1101. Water storage tank; 1102. Water inlet pipe; 1103. Water outlet pipe; 1104. Storage box; 1105. Sponge roller; 12. Drive motor; 13. First pulley; 14. Second pulley; 15. Connecting belt. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0077] like Figures 1-9 As shown in one embodiment of this application, a steel pipe surface treatment process includes the following steps:

[0078] S1: Heating and sandblasting: The internal temperature of the quenching furnace is raised to 800°C. The steel pipe is placed in the quenching furnace for heating. Then, the surface of the steel pipe is sandblasted to remove rust using a sandblasting machine. In this embodiment, the sandblasting abrasive used for rust removal is one of silicon carbide, garnet sand, or quartz sand. Preferably, silicon carbide is used as the sandblasting abrasive. The sandblasting machine is one of suction dry sandblasting machine, pressure dry sandblasting machine, or liquid sandblasting machine. Preferably, suction dry sandblasting machine is used.

[0079] S2: Cooling and heat preservation. The surface of the steel pipe is dried by blowing nitrogen gas, the temperature of the steel pipe is cooled to 300℃ and kept at that temperature for 2 hours. During the heat preservation process, polyethylene powder coating is sprayed onto the surface of the steel pipe.

[0080] S3: Pickling, immersing the steel pipe in an acidic solution. The immersion time depends on the concentration of the acidic solution. In this embodiment, the acidic solution is one of sulfuric acid, hydrochloric acid, or nitric acid. Preferably, the acidic solution is sulfuric acid.

[0081] S4: Water washing and drying. The steel pipe is removed from the pickling solution and washed with clean water, then dried to remove excess moisture.

[0082] Through the above processing process, the surface of the steel pipe can be effectively prevented from being eroded by high temperature, low temperature and humid environment, the rust layer and cracks on the surface of the steel pipe are prevented, the normal use of the steel pipe is ensured, and the service life of the steel pipe is also improved;

[0083] In the above S4 step, the surface of the dried steel pipe needs to be polished to make the smoothness of the steel pipe surface meet the requirements, so a special device needs to be used;

[0084] In the above steel pipe surface treatment process, a special device is used to polish the surface of the steel pipe, which comprises:

[0085] The base 1 is composed of a fixedly connected plate one and a plate two, the plate one is arranged in a horizontal direction, and the plate two is arranged in a vertical direction;

[0086] The rotating rod 2 and the screw rod 3 are both arranged in a horizontal direction through bearings on the base 1 and are distributed vertically, and both are driven to rotate synchronously, the rotating rod 2 and the screw rod 3 are both arranged in a horizontal direction through bearings on the plate two and are distributed vertically;

[0087] The fixing part 4 is arranged on the rotating rod 2 and is used for fixing or releasing the steel pipe;

[0088] The sliding block 5 is arranged in a horizontal direction on the base 1 and is screwed with the screw rod 3, a sliding slot is formed in the plate one in a horizontal direction, the sliding block 5 is slidably matched with the sliding slot in a horizontal direction, and the sliding of the sliding block 5 is guided and limited through the sliding slot;

[0089] The fixing ring 6 is arranged in a vertical direction on the sliding block 5 and is located outside the rotating rod 2, the inner diameter of the fixing ring 6 is greater than the outer diameter of the steel pipe, so that the steel pipe can smoothly pass through;

[0090] The three sliding rods 7 are all arranged in a sliding manner on the fixing ring 6 and are arranged in a ring array;

[0091] The driving part 8 is arranged on the fixing ring 6 and the three sliding rods 7, and drives the three sliding rods 7 to slide synchronously through the driving part 8;

[0092] The polishing part 9 and the collecting part 10 are arranged on the two sliding rods 7 located at the bottom position respectively, the surface of the steel pipe is polished through the polishing part 9, and the waste generated by polishing is collected through the collecting part 10;

[0093] The heat dissipation part 11 is arranged on the fixing ring 6 and the sliding rod 7 located at the top position and is used for dissipating heat and cooling the surface of the steel pipe;

[0094] In the initial state, the sliding block 5 is close to the second plate, and the fixed ring 6 is also close to the second plate. When polishing the surface of the steel pipe, the steel pipe is kept in the horizontal direction and passes through the inside of the fixed ring 6, one end of the steel pipe is close to the second plate, the steel pipe is located on the outer peripheral side of the rotating rod 2, the steel pipe is fixed by the fixing part 4, the three sliding rods 7 are driven to slide synchronously by the driving part 8, the polishing part 9, the collecting part 10 and the heat dissipation part 11 move synchronously with the three sliding rods 7, until the polishing part 9, the collecting part 10 and the heat dissipation part 11 are attached to the surface of the steel pipe, the rotating rod 2 and the screw rod 3 are driven to rotate synchronously in the clockwise direction, the fixed steel pipe rotates with the rotating rod 2, and the sliding block 5 slides on the first plate in the horizontal direction away from the second plate due to the thread of the screw rod 3. In the process, the surface of the steel pipe is polished by the polishing part 9, the waste generated by polishing is collected by the collecting part 10, and the surface of the steel pipe is cooled by the heat dissipation part 11. After the surface of the steel pipe is polished, the three sliding rods 7 are driven to slide synchronously by the driving part 8, and the polishing part 9, the collecting part 10 and the heat dissipation part 11 move synchronously with the three sliding rods 7. Until the polishing part 9, the collecting part 10 and the heat dissipation part 11 are away from the surface of the steel pipe, the steel pipe is released by the fixing part 4, and the steel pipe can be taken away. As described above, when the surface of the steel pipe is polished, the fixing part 4 can fix the steel pipe with different inner diameters, and the three sliding rods 7 are driven to slide synchronously by the driving part 8, so as to drive the polishing part 9, the collecting part 10 and the heat dissipation part 11 to move synchronously, so as to polish the surface of the steel pipe with different sizes, thereby improving the applicability and use flexibility. At the same time, the waste generated by polishing is collected by the collecting part 10, so as to avoid the waste remaining on the surface of the steel pipe during polishing, thereby causing scratches on the surface of the steel pipe. The surface of the steel pipe is cooled by the heat dissipation part 11, so as to avoid damage to the surface of the steel pipe due to high temperature during polishing, and therefore the application has higher practicability.

[0095] As Figure 3 shown, in some embodiments, further comprising:

[0096] The driving motor 12 is arranged on the base 1 and the output shaft is connected with the free end of the screw rod 3;

[0097] The first pulley 13 and the second pulley 14 are respectively sleeved on the same end of the rotating rod 2 and the screw rod 3;

[0098] The connecting belt 15 is wound on the first pulley 13 and the second pulley 14;

[0099] With reference to the foregoing, in the initial state, the slider 5 is close to the second plate, and the fixed ring 6 is also close to the second plate. In use, the driving motor 12 is turned on, the driving motor 12 works, the output shaft rotates in the positive direction, drives the screw rod 3 and the second belt pulley 14 to rotate synchronously in the clockwise direction, the connecting belt 15 rotates synchronously in the clockwise direction with the second belt pulley 14 and drives the first belt pulley 13 and the rotating rod 2 to rotate synchronously in the clockwise direction, and the slider 5 slides in the horizontal direction to be away from the second plate due to the thread action of the screw rod 3. Conversely, when the output shaft of the driving motor 12 reverses, the screw rod 3 and the second belt pulley 14 rotate synchronously in the counterclockwise direction, the connecting belt 15 rotates synchronously in the counterclockwise direction with the second belt pulley 14 and drives the first belt pulley 13 and the rotating rod 2 to rotate synchronously in the counterclockwise direction, and the slider 5 slides in the horizontal direction to be close to the second plate due to the thread action of the screw rod 3.

[0100] As shown in Figure 3 some embodiments, the transmission ratio of the first belt pulley 13 to the second belt pulley 14 is three to one, the diameter of the first belt pulley 13 is three times the diameter of the second belt pulley 14, and when the first belt pulley 13 rotates one circle, the second belt pulley 14 rotates one-third of a circle. Conversely, when the second belt pulley 14 rotates one circle, the first belt pulley 13 rotates one-third of a circle, that is, the transmission ratio of the first belt pulley 13 to the second belt pulley 14 is three to one. This design can slow down the sliding speed of the slider 5 to some extent, play a role in deceleration, and thus make the surface of the steel pipe be polished more uniformly.

[0101] As shown in Figures 3-4 some embodiments, the fixed part 4 includes:

[0102] three fixed plates 401, which are arranged in an annular array on the outer circumferential side of the rotating rod 2, and are provided with arc-shaped plates 402, and the fixed plates 401 and the arc-shaped plates 402 are both arranged in the horizontal direction;

[0103] a screw cylinder 403, which is arranged on the rotating rod 2 in the horizontal direction through a bearing;

[0104] a movable block 404, which is threadedly sleeved on the screw cylinder 403, and is provided with three first movable rods 405 arranged in an annular array and hinged on the movable block 404, and the free ends of the three first movable rods 405 are respectively hinged to the three fixed plates 401;

[0105] The fixed block 406 is sleeved on the rotating rod 2, and three second movable rods 407 are hingedly arranged on the fixed block 406 in an annular array, the middle positions of the three second movable rods 407 are respectively hingedly connected with the middle positions of the three first movable rods 405, and the free ends of the three second movable rods 407 are respectively slidably hingedly connected with the three fixed plates 401, the three fixed plates 401 are respectively provided with a waist hole in the horizontal direction, and the free ends of the three second movable rods 407 are respectively slidably arranged in the three waist holes, that is, the free ends of the three second movable rods 407 are respectively slidably hingedly connected with the three fixed plates 401.

[0106] With reference to the foregoing, in the initial state, the movable block 404 is away from the second plate, the three first movable rods 405 and the three second movable rods 407 tend to be in the horizontal direction, and the three fixed plates 401 are close to the rotating rod 2. When the steel pipe is kept in the horizontal direction and passes through the inside of the fixed ring 6, the fixing member 4 is located on the inside of the steel pipe. At this time, the screw cylinder 403 is rotated forward, and the movable block 404 will move to be close to the second plate in the horizontal direction due to the thread action of the screw cylinder 403. The three first movable rods 405 are synchronously rotated to tend to be in the vertical direction around the respective corresponding hinged points. Since the middle positions of the three second movable rods 407 are respectively hingedly connected with the middle positions of the three first movable rods 405, the three second movable rods 407 are also synchronously rotated to tend to be in the vertical direction around the respective corresponding hinged points at this time. The free ends of the three second movable rods 407 are respectively slidably arranged in the three waist holes, and the three fixed plates 401 are synchronously moved to be away from the rotating rod 2. The three arc-shaped plates 402 are respectively synchronously moved with the three fixed plates 401, until the outer surfaces of the three arc-shaped plates 402 are attached to the inner wall of the steel pipe, so as to fix the steel pipe. At the same time, different inner diameters of the steel pipe can be fixed. Conversely, when it is necessary to release the fixation of the steel pipe, the screw cylinder 403 is rotated reversely, and the movable block 404 will move to be away from the second plate in the horizontal direction due to the thread action of the screw cylinder 403. The three first movable rods 405 are synchronously rotated to tend to be in the horizontal direction around the respective corresponding hinged points. Since the middle positions of the three second movable rods 407 are respectively hingedly connected with the middle positions of the three first movable rods 405, the three second movable rods 407 are also synchronously rotated to tend to be in the horizontal direction around the respective corresponding hinged points at this time. The free ends of the three second movable rods 407 are respectively slidably arranged in the three waist holes, and the three fixed plates 401 are synchronously moved to be close to the rotating rod 2. The three arc-shaped plates 402 are respectively synchronously moved with the three fixed plates 401, so as to release the fixation of the steel pipe.

[0107] As Figure 3As shown, in some embodiments, the free end of each of the three arc-shaped plates 402 is provided with a limiting block 408. As described above, when polishing the surface of the steel pipe, the steel pipe is kept in a horizontal direction and passes through the inner side of the fixing ring 6, and one end of the steel pipe is close to the second plate until the one end of the steel pipe abuts against the limiting block 408. The design of the limiting block 408 can avoid the steel pipe contacting the second plate of the base 1, thereby avoiding the friction between the steel pipe and the second plate of the base 1 when rotating.

[0108] As shown, in some embodiments, the driving member 8 comprises: Figure 5

[0109] three rotating discs 801, which are eccentrically hinged on the fixing ring 6 and arranged in a ring array;

[0110] three fixing rods 802, which are respectively arranged on the three rotating discs 801 and are hingedly connected with the three sliding rods 7 at the free ends;

[0111] two first connecting rods 803, which are respectively arranged on two of the rotating discs 801;

[0112] a second connecting rod 804, which is arranged on the other rotating disc 801;

[0113] two third connecting rods 805, which are arranged in a ring array, one end of one of the third connecting rods 805 is hingedly connected with the free end of one of the first connecting rods 803, and the other end of the third connecting rod 805 is hingedly connected with the other end of the other first connecting rod 803 and the free end of the second connecting rod 804;

[0114] an electric push rod 806, which is hingedly arranged at the fixed end on the fixing ring 6 and is hingedly connected at the free end with the other end of the other first connecting rod 803;

[0115] ​In the present embodiment, for the convenience of understanding, the three rotating discs 801 are respectively named as A, B and C, wherein A is located at the top position, B and C are both located at the bottom position, two first connecting rods 803 are respectively arranged on A and B, the second connecting rod 804 is arranged on C, the movable end of the electric push rod 806 is hinged with the other end of the first connecting rod 803 on B, in the initial state, the movable end of the electric push rod 806 is in the retracted state, after the steel pipe is fixed by the fixing member 4, the electric push rod 806 is opened, the movable end of the electric push rod 806 is extended, the fixed end of the electric push rod 806 rotates around the hinge point, forcing the first connecting rod 803 on B and B to rotate synchronously around the hinge point, one of the third connecting rods 805 rotates synchronously with the rotation of the first connecting rod 803, the fixed rod 802 on B rotates synchronously with the rotation of B and forces the slide rod 7 corresponding to B to slide close to the steel pipe, the first connecting rod 803 on A and A rotate synchronously around the hinge point, the other third connecting rod 805 rotates synchronously with the rotation of the first connecting rod 803, the fixed rod 802 on A rotates synchronously with the rotation of A and forces the slide rod 7 corresponding to A to slide close to the steel pipe, the second connecting rod 804 and C rotate synchronously around the hinge point, the fixed rod 802 on C rotates synchronously with the rotation of C and forces the slide rod 7 corresponding to C to slide close to the steel pipe, so as to drive the three slide rods 7 to slide synchronously, the polishing member 9, the collecting member 10 and the heat dissipation member 11 move synchronously with the three slide rods 7 respectively, until the polishing member 9, the collecting member 10 and the heat dissipation member 11 all adhere to the surface of the steel pipe, on the contrary, the electric push rod 806 is opened, the movable end of the electric push rod 806 is retracted, the fixed end of the electric push rod 806 rotates around the hinge point, forcing the first connecting rod 803 on B and B to rotate synchronously around the hinge point, one of the third connecting rods 805 rotates synchronously with the rotation of the first connecting rod 803, the fixed rod 802 on B rotates synchronously with the rotation of B and forces the slide rod 7 corresponding to B to slide away from the steel pipe, the first connecting rod 803 on A and A rotate synchronously around the hinge point, the other third connecting rod 805 rotates synchronously with the rotation of the first connecting rod 803, the fixed rod 802 on A rotates synchronously with the rotation of A and forces the slide rod 7 corresponding to A to slide away from the steel pipe, the second connecting rod 804 and C rotate synchronously around the hinge point, the fixed rod 802 on C rotates synchronously with the rotation of C and forces the slide rod 7 corresponding to C to slide away from the steel pipe, so as to drive the three slide rods 7 to slide synchronously, the polishing member 9, the collecting member 10 and the heat dissipation member 11 move synchronously with the three slide rods 7 respectively, until the polishing member 9, the collecting member 10 and the heat dissipation member 11 all move away from the surface of the steel pipe.

[0116] As shown in some embodiments, the polishing member 9 comprises: Figure 6

[0117] The connecting rod 901 is arranged on the slide rod 7.

[0118] ​The connecting plate 902 is configured in an arc shape and is arranged at the free end of the connecting rod 901.

[0119] The polishing sandpaper 903 is arranged at the inner side of the connecting plate 902.

[0120] With the above, the connecting rod 901, the connecting plate 902 and the polishing sandpaper 903 move together with the sliding rod 7 until the inner side of the polishing sandpaper 903 is attached to the surface of the steel pipe. When the steel pipe rotates, the polishing sandpaper 903 is always in contact with the surface of the steel pipe, thereby polishing the outer surface of the steel pipe.

[0121] As shown in FIG. 1, in some embodiments, the collecting device 10 comprises: Figure 7 The collecting cylinder 1001 is arranged on the sliding rod 7.

[0122] The rubber scraper 1002 is arranged at the free end of the collecting cylinder 1001. The rubber scraper 1002 is configured in a cylindrical shape as a whole, and the free end of the rubber scraper 1002 is configured in an arc shape.

[0123] The insertion slot 1003 and the positioning hole 1004 are both arranged on the sliding rod 7 and are in communication with each other.

[0124] The insertion block 1005 is arranged on the collecting cylinder 1001 and is tightly inserted into the insertion slot 1003. The threaded hole 1006 is arranged through the insertion block 1005.

[0125] The bolt 1007 is inserted into the positioning hole 1004 and is screwed into the threaded hole 1006.

[0126]

[0127] ​In normal use, the collecting cylinder 1001 and the slide bar 7 are in a connected and fixed state, at this time, the plug-in block 1005 is located in the plug-in groove 1003, the positioning hole 1004 and the threaded hole 1006 are in communication, the bolt 1007 is inserted into the positioning hole 1004 and is screwed with the threaded hole 1006, referring to the above, the collecting piece 10 will move together with the slide bar 7 until the free end of the rubber scraper 1002 is attached to the surface of the steel pipe, and the rubber scraper 1002 is always in contact with the surface of the steel pipe when the steel pipe rotates, so as to scrape and collect the waste on the surface of the steel pipe, and the scraped waste will enter the collecting cylinder 1001 to avoid the waste remaining on the surface of the steel pipe during polishing, thereby causing scratches on the surface of the steel pipe, and as time goes by, the waste in the collecting cylinder 1001 will also increase, at this time, the collecting cylinder 1001 needs to be detached from the slide bar 7, and then the waste in the collecting cylinder 1001 is poured out, the specific operation is as follows, the bolt 1007 is loosened away from the positioning hole 1004 and the threaded hole 1006 by means of a tool, so that the collecting cylinder 1001 is away from the slide bar 7, until the plug-in block 1005 is separated from the plug-in groove 1003, then the waste in the collecting cylinder 1001 is poured out and the inside of the collecting cylinder 1001 is cleaned, and then the collecting cylinder 1001 is reinstalled on the slide bar 7, the specific operation is as follows, the plug-in block 1005 is tightly inserted into the plug-in groove 1003 until the positioning hole 1004 and the threaded hole 1006 are in communication, the bolt 1007 is inserted into the positioning hole 1004 and is tightened by means of a tool, so that the bolt 1007 and the threaded hole 1006 are screwed.

[0128] As shown in FIG. 1, in some embodiments, the heat dissipation piece 11 comprises: Figures 8-9

[0129] The water storage tank 1101 is arranged on the fixed ring 6, and the water inlet pipe 1102 and the water outlet pipe 1103 are in communication with the water storage tank 1101, and the water inlet pipe 1102 and the water outlet pipe 1103 are respectively located at the top and the bottom of the water storage tank 1101;

[0130] The storage tank 1104 is arranged on the slide bar 7, the free end of the water outlet pipe 1103 is in communication with the inside of the storage tank 1104, the bottom of the storage tank 1104 is rotatably provided with the sponge roller 1105 through a bearing, the bottom of the storage tank 1104 is provided with an opening, the sponge roller 1105 is rotatably arranged at the opening and seals the opening, and a part of the sponge roller 1105 is located in the storage tank 1104;

[0131] ​Before use, the water tank 1101 needs to be filled with water through the water inlet pipe 1102, and the water in the water tank 1101 flows into the storage tank 1104 along the water outlet pipe 1103 and wets the part of the sponge roller 1105 inside the storage tank 1104. During use, the storage tank 1104 and the sponge roller 1105 move together with the sliding rod 7, until the sponge roller 1105 is attached to the surface of the steel pipe. When the steel pipe rotates, it drives the sponge roller 1105 to rotate. The water in the storage tank 1104 continuously wets the sponge roller 1105, which cools the surface of the steel pipe. The water in the water tank 1101 continuously flows into the storage tank 1104 through the water outlet pipe 1103 to cool the surface of the steel pipe and prevent damage to the surface of the steel pipe due to high temperature during polishing.

[0132] The above-mentioned special device is used to polish the surface of the steel pipe, including the following steps:

[0133] S101: Steel pipe fixing, keeping the steel pipe horizontal and on the outer periphery of the rotating rod 2, and fixing the steel pipe by the fixing part 4;

[0134] S102: Polishing, driving the three sliding rods 7 to slide synchronously by the driving part 8, and moving the polishing part 9, the collecting part 10 and the heat dissipation part 11 synchronously with the three sliding rods 7, until the polishing sandpaper 903, the rubber scraper 1002 and the sponge roller 1105 are attached to the surface of the steel pipe. Drive the rotating rod 2 and the screw rod 3 to rotate synchronously, and the fixed steel pipe rotates with the rotating rod 2. The sliding block 5 slides on the base 1 and drives the fixed ring 6 to move. The polishing part 9 polishes the surface of the steel pipe, the collecting part 10 collects the waste generated by polishing, and the heat dissipation part 11 cools the surface of the steel pipe;

[0135] S103: The steel pipe is fixed by the fixing part 4, and the polished steel pipe is taken away.

[0136] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A surface treatment process for steel pipes, characterized in that, Includes the following steps: S1: Heating and sandblasting: The internal temperature of the quenching furnace is raised to 800℃, the steel pipe is placed in the quenching furnace for heating, and then the surface of the steel pipe is sandblasted to remove rust using a sandblasting machine. S2: Cooling and heat preservation. The surface of the steel pipe is dried by blowing nitrogen gas, the temperature of the steel pipe is cooled to 300℃ and kept at that temperature for 2 hours. During the heat preservation process, polyethylene powder coating is sprayed onto the surface of the steel pipe. S3: Pickling, immersing the steel pipe in an acidic solution, the immersion time depends on the concentration of the acidic solution; S4: Water washing and drying. The steel pipe is removed from the pickling solution and washed with clean water, then dried to remove excess moisture. In the above-mentioned steel pipe surface treatment process, a special device is required to polish the surface of the steel pipe. This special device includes: Base (1); The rotating rod (2) and the lead screw (3) are both mounted on the base (1) in a horizontal direction via bearings and are distributed vertically. They rotate synchronously under the drive. The fixing element (4) is set on the rotating rod (2) and is used to fix or release the steel pipe; The slider (5) is horizontally slidably disposed on the base (1) and threadedly engaged with the lead screw (3); A fixing ring (6) is vertically disposed on the slider (5) and located outside the rotating rod (2); Three sliding rods (7) are all slidably set on the fixed ring (6) and distributed in a ring array; A driving element (8) is provided on the fixed ring (6) and the three slide rods (7), and the driving element (8) drives the three slide rods (7) to slide synchronously. The polishing component (9) and the collecting component (10) are respectively set on the two slide bars (7) located at the bottom position. The surface of the steel pipe is polished by the polishing component (9), and the waste generated by polishing is collected by the collecting component (10). A heat dissipation component (11) is provided on the fixing ring (6) and the slide rod (7) located at the top position and is used to dissipate heat and cool the surface of the steel pipe. The polished part (9) includes: A connecting rod (901) is provided on the slide rod (7); The connecting plate (902) is arc-shaped and is located at the free end of the connecting rod (901); Polishing sandpaper (903) is provided on the inner side of the connecting plate (902).

2. The steel pipe surface treatment process according to claim 1, characterized in that, Also includes: A drive motor (12) is mounted on the base (1) and its output shaft is connected to the free end of the lead screw (3); The first pulley (13) and the second pulley (14) are respectively fitted onto the same end of the rotating rod (2) and the lead screw (3); A connecting belt (15) is wound around the first pulley (13) and the second pulley (14).

3. The steel pipe surface treatment process according to claim 2, characterized in that, The transmission ratio between the first pulley (13) and the second pulley (14) is three to one.

4. The steel pipe surface treatment process according to claim 3, characterized in that, The fastener (4) includes: Three fixed plates (401) are arranged in a ring array on the outer periphery of the rotating rod (2), and an arc plate (402) is provided on the fixed plate (401). The screw barrel (403) is mounted on the rotating rod (2) in a horizontal direction via a bearing; The movable block (404) is threaded onto the screw cylinder (403). Three first movable rods (405) are hinged on the movable block (404) in a ring array. The free ends of the three first movable rods (405) are respectively hinged to the three fixed plates (401). A fixed block (406) is sleeved on the rotating rod (2). Three second movable rods (407) are hinged on the fixed block (406) in a circular array. The middle positions of the three second movable rods (407) are respectively hinged to the middle positions of the three first movable rods (405). The free ends of the three second movable rods (407) are respectively slidably hinged to the three fixed plates (401).

5. The steel pipe surface treatment process according to claim 4, characterized in that, Limiting blocks (408) are provided at the free ends of the three arc-shaped plates (402).

6. The steel pipe surface treatment process according to claim 5, characterized in that, The driving component (8) includes: The three turntables (801) are all eccentrically hinged on the fixed ring (6) and distributed in a ring array; Three fixed rods (802) are respectively set on the three turntables (801) and their free ends are respectively hinged to the three sliding rods (7); Two first links (803) are respectively mounted on two of the turntables (801); The second link (804) is mounted on another of the aforementioned turntables (801); Two third links (805) are arranged in a circular array. The two ends of one of the third links (805) are respectively hinged to the free ends of the two first links (803), and the two ends of the other third link (805) are respectively hinged to the other end of one of the first links (803) and the free end of the second link (804). The electric push rod (806) has its fixed end hinged to the fixed ring (6) and its movable end hinged to the other end of the other first connecting rod (803).

7. The steel pipe surface treatment process according to claim 6, characterized in that, The collection component (10) includes: A collection tube (1001) is mounted on the slide bar (7); A rubber scraper (1002) is disposed at the free end of the collecting cylinder (1001), and the free end of the rubber scraper (1002) is constructed in an arc shape; The insertion slot (1003) and the positioning hole (1004) are both opened on the slide rod (7) and are interconnected; A plug-in block (1005) is disposed on the collecting cylinder (1001) and is tightly inserted into the plug-in groove (1003). A threaded hole (1006) is provided through the plug-in block (1005). The bolt (1007) is inserted into the positioning hole (1004) and threaded into the threaded hole (1006).

8. The steel pipe surface treatment process according to claim 7, characterized in that, The heat sink (11) includes: A water storage tank (1101) is installed on the fixed ring (6), and an inlet pipe (1102) and an outlet pipe (1103) are connected to the water storage tank (1101). Storage tank (1104) is mounted on slide bar (7). The free end of water outlet pipe (1103) is connected to the inside of storage tank (1104). A sponge roller (1105) is rotatably mounted on the bottom of storage tank (1104) via bearing.

9. The steel pipe surface treatment process according to claim 8, characterized in that, Polishing the surface of the steel pipe using the aforementioned specialized equipment includes the following steps: S101: Steel pipe fixing, so that the steel pipe is kept horizontal and located on the outer periphery of the rotating rod (2), and the steel pipe is fixed by the fixing part (4); S102: Polishing process. The three slide rods (7) are driven to slide synchronously by the drive component (8). The polishing component (9), the collecting component (10), and the heat dissipation component (11) move synchronously with the three slide rods (7) until the polishing sandpaper (903), the rubber scraper (1002), and the sponge roller (1105) are all in contact with the surface of the steel pipe. The rotating rod (2) and the lead screw (3) are driven to rotate synchronously. The fixed steel pipe rotates together with the rotating rod (2). The slider (5) slides on the base (1) and drives the fixed ring (6) to move together. The surface of the steel pipe is polished by the polishing component (9). The waste generated by polishing is collected by the collecting component (10). The surface of the steel pipe is cooled by the heat dissipation component (11). S103: The steel pipe is released from the fastener (4) and the polished steel pipe is removed.

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