An apparatus for removing the surface coating of galvanized pipe

Abstract

The application provides a device for removing the surface coating of a galvanized pipe, comprising a steel pipe inner fixing device fixed inside a steel pipe, a shaft sleeve fixedly installed at the shaft center of the steel pipe inner fixing device, a rotating support movably inserted into the shaft sleeve, a plurality of telescopic sleeves fixedly connected to one end of the rotating support away from the shaft sleeve, a rotating shaft of a power rubber wheel fixedly connected to a driving shaft of a driving motor, a zinc removal wheel movably abutting against the surface of the steel pipe arranged at the bottom of the movable arm, and a hydrochloric acid storage cabin arranged in the movable arm, wherein the hydrochloric acid in the hydrochloric acid storage cabin is coated on the surface of the steel pipe during the rotation of the zinc removal wheel. The device adopts a chemical and physical combined action to remove zinc on the surface of the steel pipe, and compared with a simple polishing wheel polishing method, the damage to the surface of the steel pipe is smaller, and for a thicker galvanized layer, the device still has a good zinc removal effect, thereby ensuring the quality of subsequent welding.

Description

Technical Field

[0001] This invention relates to the field of zinc removal devices for pipelines, specifically a device for removing the coating from the surface of galvanized pipes. Background Technology

[0002] A pipe flange pretreatment production line disclosed in the prior art (CN212444123U) allows for convenient movement of workpieces between various stations, thereby improving processing efficiency. The production line includes a workbench comprising a zinc removal station, a beveling station, and a butt welding station. Each of these stations is equipped with a drive support base for supporting and driving the workpiece rotation. The zinc removal station is equipped with polishing equipment, the beveling station with beveling equipment, and the butt welding station with welding equipment. Each station is connected by a transfer device, which includes a transfer plate. One end of the transfer plate is hinged to the side of the drive support base at the next station, and the other end extends to the side of the drive support base at the previous station and is connected to a lifting cylinder. When the transfer device is not activated, the transfer plate is lower than the contact surface between the drive support base and the workpiece.

[0003] To ensure the welding quality between adjacent steel pipes, a zinc removal process is required at the pipe ends before welding. However, the zinc removal method used in the flange pretreatment production line has significant drawbacks: the device grinds the pipe with a polishing wheel to remove zinc, but this polishing method alone can damage the outer wall of the pipe. Furthermore, if the galvanized layer on the outside of the steel pipe is thick, foam grinding often results in galvanized residue, affecting the zinc removal effect and subsequent welding quality. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus* for removing the coating from the surface of galvanized pipes, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An apparatus for removing the coating from the surface of a galvanized pipe includes an internal fixing device for the steel pipe, the internal fixing device being fixed inside the steel pipe, a bushing being fixedly installed at the axis of the internal fixing device, a rotating bracket being movably inserted inside the bushing, and the end of the rotating bracket away from the bushing being fixedly connected to a plurality of telescopic sleeves arranged in a ring array, and a zinc removal device being telescopically installed inside the telescopic sleeves.

[0007] Each of the aforementioned zinc removal devices includes a movable arm, within which a power rubber wheel is installed that movably abuts against the surface of a steel pipe. The rotating shaft of the power rubber wheel is fixedly connected to the drive shaft of a drive motor. The rotation of the drive motor drives the power rubber wheel to rotate, and the rotation of the power rubber wheel drives the movable arms to perform circumferential motion around the axle sleeve on the outer surface of the steel pipe. A zinc removal wheel is also installed at the bottom of the movable arm that movably abuts against the surface of the steel pipe. The zinc removal wheel rotates in the opposite direction during the circumferential motion of the movable arm around the outer surface of the steel pipe to remove zinc from the surface of the steel pipe. A hydrochloric acid storage chamber is also installed inside the movable arm. The hydrochloric acid in the hydrochloric acid storage chamber is coated onto the surface of the steel pipe during the rotation of the zinc removal wheel. The zinc removal wheel includes a hydrochloric acid coating area, a grinding area, and a brush cleaning area.

[0008] Preferably, a drive gear is fixedly installed at the shaft of the power rubber wheel. The drive gear meshes with a driven gear. A drive pulley is fixedly connected to the axle of the driven gear. The drive pulley is connected to the driven pulley via an elastic belt. The driven pulley is coaxially fixedly connected to the zinc removal wheel. The rotation of the power rubber wheel ultimately drives the zinc removal wheel to rotate in the opposite direction.

[0009] Preferably, a crankshaft connecting rod is fixedly connected to the axle of the drive gear, and a telescopic rod is movably sleeved on the crankshaft connecting rod. The telescopic rod is movably connected to a one-way intake piston. The one-way intake piston is telescopically disposed in a piston cylinder. The piston cylinder is connected to a hydrochloric acid storage chamber through a one-way intake valve. The hydrochloric acid storage chamber is connected to a capillary liquid storage plate through a liquid outlet. The capillary liquid storage plate transfers hydrochloric acid to the hydrochloric acid coating area during the rotation of the zinc removal wheel.

[0010] Preferably, the zinc removal wheel is also movably connected to a lifting block, which is movably positioned in a lifting groove in the movable arm. The lifting block and the movable arm are connected by a compression spring, which pushes the zinc removal wheel to closely abut against the steel pipe without external force.

[0011] Preferably, a fastening screw is fixedly connected to the end of the lifting block away from the zinc removal wheel, and a fastening limit bolt is movably sleeved on the fastening screw. The fastening limit bolt limits the lifting of the lifting block by abutting against the movable arm.

[0012] Preferably, the internal fixing device of the steel pipe includes a mounting base, on which a plurality of scissor-type fixing telescopic rods are arranged in a circular array. A positioning block is provided at the end of each scissor-type fixing telescopic rod away from the mounting base. The plurality of positioning blocks abut against the inner wall of the steel pipe to complete the internal fixing of the mounting base.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention uses a combination of chemical and physical methods to remove zinc from the surface of steel pipes. Compared with simple polishing wheel grinding, it causes less damage to the surface of the steel pipe and can still achieve good zinc removal effect even for thick galvanized layers, ensuring the quality of subsequent welding. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the enlarged structure of region A of the present invention;

[0017] Figure 3 This is a side view of the zinc removal wheel structure of the present invention.

[0018] In the diagram: 1. Steel pipe internal fixing device; 2. Steel pipe; 3. Bushing; 4. Rotating bracket; 5. Telescopic sleeve; 6. Zinc removal device; 7. Movable arm; 8. Power rubber wheel; 9. Drive motor; 10. Zinc removal wheel; 11. Hydrochloric acid storage chamber; 12. Hydrochloric acid coating area; 13. Grinding area; 14. Brush cleaning area; 15. Drive gear; 16. Driven gear; 17. Drive pulley; 18. Elastic belt; 19. Driven pulley; 20. Crankshaft connecting rod; 21. Telescopic rod; 22. One-way intake piston; 23. Piston cylinder; 24. One-way intake valve; 25. Liquid outlet; 26. Capillary liquid storage plate; 27. Lifting block; 28. Lifting groove; 29. ​​Compression spring; 30. Fastening screw; 31. Fastening limit bolt; 32. Mounting base; 33. Scissor-type fixed telescopic rod; 34. Positioning block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-3 The present invention provides a technical solution:

[0021] Example 1:

[0022] An apparatus for removing the coating from the surface of a galvanized pipe includes a steel pipe internal fixing device 1, which is fixed inside a steel pipe 2. A bushing 3 is fixedly installed at the axis of the steel pipe internal fixing device 1. A rotating bracket 4 is movably inserted inside the bushing 3. The end of the rotating bracket 4 away from the bushing 3 is fixedly connected to a plurality of telescopic sleeves 5 arranged in a ring array. A zinc removal device 6 is telescopically installed inside the telescopic sleeves 5.

[0023] Each of the zinc removal devices 6 includes a movable arm 7. Inside the movable arm 7, a power rubber wheel 8 is installed that moves against the surface of the steel pipe 2. The rotating shaft of the power rubber wheel 8 is fixedly connected to the drive shaft of the drive motor 9. The rotation of the drive motor 9 drives the power rubber wheel 8 to rotate. The rotation of the power rubber wheel 8 drives the movable arms 7 to perform circumferential motion around the bushing 3 on the outer surface of the steel pipe 2. At the bottom of the movable arm 7, a zinc removal wheel 10 is also installed that moves against the surface of the steel pipe 2. During the circumferential motion of the movable arm 7 around the outer surface of the steel pipe 2, the zinc removal wheel 10 rotates in the opposite direction to remove zinc from the surface of the steel pipe 2. Inside the movable arm 7, a hydrochloric acid storage chamber 11 is also installed. The hydrochloric acid in the hydrochloric acid storage chamber 11 is coated on the surface of the steel pipe 2 during the rotation of the zinc removal wheel 10. The zinc removal wheel 10 includes a hydrochloric acid coating area 12, a grinding area 13, and a brush cleaning area 14.

[0024] In this embodiment, the internal fixing device 1 of the steel pipe is used to fix the inside of the steel pipe 2, thereby fixing the zinc removal device 6 to the outside of the steel pipe 2. The zinc removal device 6 removes the external galvanized layer at the interface of the steel pipe 2 by rotating around the outside of the steel pipe 2. The zinc removal device 6 includes a movable arm 7, which is equipped with a zinc removal mechanism. The mechanism that drives the movable arm 7 to move in a circular motion around the bushing 3 is a power rubber wheel 8. The rotation of the power rubber wheel 8 drives the movable arm 7 to rotate. During the rotation of the movable arm 7, the zinc removal wheel 10 rotates in the opposite direction to remove zinc from the surface of the steel pipe 2. The zinc removal wheel 10 includes a hydrochloric acid coating area 12, a grinding area 13, and a brush cleaning area 14. The hydrochloric acid coating area 12 is used to coat the surface of the steel pipe 2 with hydrochloric acid to react chemically with the galvanized layer. The grinding area 13 is used to grind the galvanized layer. The brush cleaning area 14 is used to sweep away the galvanized layer that has been ground off. The above method can effectively remove zinc from the steel pipe. The galvanized layer on the outside of the steel pipe 2 is removed to ensure the subsequent welding quality of the steel pipe 2. The movable arm 7 is equipped with a hydrochloric acid storage chamber 11. During the rotation of the zinc removal wheel 10, the hydrochloric acid solution stored in the hydrochloric acid storage chamber 11 is coated onto the surface of the steel pipe 2 through the hydrochloric acid coating area 12. The hydrochloric acid coating area 12 is a cotton-like adsorption layer, which adsorbs hydrochloric acid in a way similar to that of a sponge. The hydrochloric acid is transferred through contact with the surface of the steel pipe 2. The steel pipe internal fixing device 1 in this embodiment includes a mounting base 32. Several scissor-type fixed telescopic rods 33 are arranged in a ring array on the mounting base 32. A positioning block 34 is provided at the end of the scissor-type fixed telescopic rod 33 away from the mounting base 32. Several positioning blocks 34 abut against the inner wall of the steel pipe 2 to complete the internal fixing of the mounting base 32. The distance between the positioning block 34 and the mounting base 32 is adjusted by operating the included angle of the scissor-type fixed telescopic rods 33, thereby fixing the inner wall of the steel pipe 2 by several positioning blocks 34.

[0025] Example 2:

[0026] A drive gear 15 is fixedly installed at the shaft of the drive rubber wheel 8. The drive gear 15 meshes with the driven gear 16. A drive pulley 17 is fixedly connected to the axle of the driven gear 16. The drive pulley 17 is connected to the driven pulley 19 through a spring belt 18. The driven pulley 19 is coaxially fixedly connected to the zinc removal wheel 10. The rotation of the drive rubber wheel 8 eventually drives the zinc removal wheel 10 to rotate in the opposite direction. In this embodiment, the drive mechanism for the reverse rotation of the zinc removal wheel 10 is the drive rubber wheel 8. The rotation of the drive rubber wheel 8 drives the drive gear 15 to rotate. The drive gear 15 drives the driven gear 16 to rotate in the opposite direction. The driven gear 16 drives the drive pulley 17 and the driven pulley 19 to rotate. The rotation of the driven pulley 19 eventually drives the zinc removal wheel 10 to rotate. This method reduces the use of a power unit.

[0027] Example 3:

[0028] A crankshaft connecting rod 20 is fixedly connected to the axle of the drive gear 15. A telescopic rod 21 is movably sleeved on the crankshaft connecting rod 20. The telescopic rod 21 is movably connected to a one-way intake piston 22. The one-way intake piston 22 is telescopically disposed in a piston cylinder 23. The piston cylinder 23 is connected to the hydrochloric acid storage chamber 11 through a one-way intake valve 24. The hydrochloric acid storage chamber 11 is connected to a capillary liquid storage plate 26 through an outlet hole 25. During the rotation of the zinc removal wheel 10, the capillary liquid storage plate 26 transfers hydrochloric acid to the hydrochloric acid coating area 12. In this embodiment, the drive gear 15 serves as the driving mechanism for pumping hydrochloric acid out of the hydrochloric acid storage chamber 11. The rotation of the drive gear 15 drives the crankshaft connecting rod 20 to rotate, and the rotation of the crankshaft connecting rod 20 drives the telescopic rod 21 to rotate. The telescopic rod 21 moves to drive the one-way intake piston 22 to extend and retract. The one-way intake piston 22 is equipped with a one-way intake valve. During the extension and retraction of the one-way intake piston 22, gas enters the piston cylinder 23 through the one-way intake valve. After entering the piston cylinder 23, the gas enters the hydrochloric acid storage chamber 11 through the one-way intake valve 24 during the compression process of the one-way intake piston 22. This increases the internal pressure of the hydrochloric acid storage chamber 11. The increased internal pressure causes the hydrochloric acid inside the hydrochloric acid storage chamber 11 to adhere to the capillary liquid storage plate 26 through the liquid outlet 25. The capillary liquid storage plate 26 is a cotton adsorption mechanism. The hydrochloric acid attached to it is transferred by contacting the hydrochloric acid coating area 12.

[0029] Example 4: A lifting block 27 is movably connected to the shaft of the zinc removal wheel 10. The lifting block 27 is movably positioned within the lifting groove 28 of the movable arm 7. The lifting block 27 and the movable arm 7 are connected by a compression spring 29. The compression spring 29 pushes the zinc removal wheel 10 to closely contact the steel pipe 2 without external force. To achieve close contact between the zinc removal wheel 10 and the steel pipe 2, the compression spring 29 applies downward pressure to the zinc removal wheel 10, thereby ensuring that all zinc removal operations of the zinc removal wheel 10 can be carried out smoothly. Furthermore, a fastening screw 30 is fixedly connected to the end of the lifting block 27 away from the zinc removal wheel 10. A fastening limit bolt 31 is movably sleeved on the fastening screw 30. 31 limits the lifting of the lifting block 30 by abutting against the movable arm 7. The zinc removal wheel 10 is limited by tightening the limiting bolt 31, so that it stops at a certain height. This operation allows the zinc removal wheel 10 to be raised before the grinding and zinc removal operation, so that only the hydrochloric acid coating area 12 can contact the steel pipe during the rotation of the zinc removal wheel 10, while the grinding area 13 and the brush cleaning area 14 do not contact the surface of the steel pipe 2. This operation facilitates the hydrochloric acid to fully dissolve the surface of the steel pipe 2. After the reaction is completed, the limiting bolt 31 is released, and the grinding and cleaning operation can be performed under the push of the compression spring 29.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for removing the coating from the surface of a galvanized pipe, comprising an internal fixing device for the steel pipe, wherein the internal fixing device is fixed inside the steel pipe, characterized in that: A bushing is fixedly installed at the axis of the steel pipe fixing device. A rotating bracket is movably inserted into the bushing. The end of the rotating bracket away from the bushing is fixedly connected to a number of telescopic sleeves arranged in a ring array. A zinc removal device is telescopically installed inside the telescopic sleeve. Each of the aforementioned zinc removal devices includes a movable arm, within which a power rubber wheel is installed that movably abuts against the surface of a steel pipe. The rotating shaft of the power rubber wheel is fixedly connected to the drive shaft of a drive motor. The rotation of the drive motor drives the power rubber wheel to rotate, and the rotation of the power rubber wheel drives the movable arms to perform circumferential motion around the axle sleeve on the outer surface of the steel pipe. A zinc removal wheel is also installed at the bottom of the movable arm that movably abuts against the surface of the steel pipe. The zinc removal wheel rotates in the opposite direction during the circumferential motion of the movable arm around the outer surface of the steel pipe to remove zinc from the surface of the steel pipe. A hydrochloric acid storage chamber is also installed inside the movable arm. The hydrochloric acid in the hydrochloric acid storage chamber is coated onto the surface of the steel pipe during the rotation of the zinc removal wheel. The zinc removal wheel includes a hydrochloric acid coating area, a grinding area, and a brush cleaning area.

2. The apparatus for removing the coating from the surface of a galvanized pipe according to claim 1, characterized in that: A drive gear is fixedly installed at the shaft of the power rubber wheel. The drive gear meshes with the driven gear. A drive pulley is fixedly connected to the shaft of the driven gear. The drive pulley is connected to the driven pulley via an elastic belt. The driven pulley is coaxially fixedly connected to the zinc removal wheel. The rotation of the power rubber wheel eventually drives the zinc removal wheel to rotate in the opposite direction.

3. The apparatus for removing the coating from the surface of a galvanized pipe according to claim 2, characterized in that: A crankshaft connecting rod is also fixedly connected to the axle of the drive gear. A telescopic rod is movably sleeved on the crankshaft connecting rod. The telescopic rod is movably connected to a one-way intake piston. The one-way intake piston is telescopically disposed in a piston cylinder. The piston cylinder is connected to a hydrochloric acid storage chamber through a one-way intake valve. The hydrochloric acid storage chamber is connected to a capillary liquid storage plate through an outlet hole. The capillary liquid storage plate transfers hydrochloric acid to the hydrochloric acid coating area during the rotation of the zinc removal wheel.

4. The apparatus for removing the coating from the surface of a galvanized pipe according to claim 2 or 3, characterized in that: The zinc removal wheel is also movably connected to a lifting block. The lifting block is movably positioned in a lifting groove opened in the movable arm. The lifting block and the movable arm are connected by a compression spring. The compression spring pushes the zinc removal wheel to closely abut against the steel pipe without external force.

5. The apparatus for removing the coating from the surface of a galvanized pipe according to claim 4, characterized in that: The lifting block is also fixedly connected to a fastening screw at the end away from the zinc removal wheel. A fastening limit bolt is movably sleeved on the fastening screw. The fastening limit bolt limits the lifting of the lifting block by abutting against the movable arm.

6. The apparatus for removing the coating from the surface of a galvanized pipe according to claim 5, characterized in that: The internal fixing device of the steel pipe includes a mounting base, on which a plurality of scissor-type fixed telescopic rods are arranged in a circular array. A positioning block is provided at the end of the scissor-type fixed telescopic rod away from the mounting base. The plurality of positioning blocks abut against the inner wall of the steel pipe to complete the internal fixing of the mounting base.

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