A polishing device and polishing method for steel pipe machining production

Abstract

The application relates to a steel pipe machining and polishing technology field, in particular to a polishing device and polishing method for steel pipe machining and production, which comprises a cylindrical outer polishing part, a cylindrical inner polishing part and a base, the outer polishing part and the inner polishing part are respectively kept in close contact with the outer side and the inner side of the steel pipe, when the steel pipe and the outer polishing part and the inner polishing part relatively move, the relative motion speed of the inner part of the steel pipe and the inner polishing part is the same as the relative motion speed of the outer part of the steel pipe and the outer polishing part, the top end of the base is fixedly connected with a second supporting ring, a second rotating drum is arranged in the second supporting ring, and a conical drum is slidably connected to the outer side of the second rotating drum. When the polishing device is used, the relative motion speed of the inner part of the steel pipe and the inner polishing part is the same as the relative motion speed of the outer part of the steel pipe and the outer polishing part, so that the polishing speed and efficiency of the inner part and the outer part of the steel pipe are kept synchronous, the phenomenon that one side of the steel pipe is excessively polished is avoided, and the qualified rate of the steel pipe machining is increased.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing and grinding technology, specifically to a grinding device and grinding method for steel pipe processing and production. Background Technology

[0002] Steel pipes need to be ground using a grinding device after cutting, before joining, and during rust removal. For example, Figure 1 and Figure 2 As shown, the inside of the steel pipe 1 is hollow. Due to the presence of the steel pipe wall, there is a thickness difference d between the inside and outside of the steel pipe 1 and the center line. That is, when the steel pipe 1 rotates, there will be a difference in linear velocity between the inside and outside of the steel pipe 1.

[0003] When removing rust or connecting steel pipe 1, both the inside and outside of steel pipe 1 need to be ground in order to increase efficiency and save grinding time.

[0004] 1. In the existing technology, coaxial outer grinding part 3 and inner grinding part 2 are often used to grind the outer and inner sides of the steel pipe 1 simultaneously, respectively;

[0005] 2. Chinese invention patent application number 201810961575.8 discloses a mechanical processing and grinding device for grinding the end of steel pipes. It describes a technical solution to the problem that "existing grinding equipment requires workers to hold the grinding wheel and grind the inner and outer rings of the steel pipes in turn, which increases the processing time of the steel pipes". The device uses multiple gears and other transmissions to achieve simultaneous rotation of the outer grinding wheel and the inner grinding wheel.

[0006] The above solutions all aim to achieve simultaneous grinding of the inner and outer sides of the steel pipe, thereby saving grinding time and increasing grinding efficiency. However, due to the difference in linear velocity between the inner and outer sides when the steel pipe 1 rotates, there will be a problem of asynchronous grinding between the inner and outer sides. For example, when removing rust from the steel pipe 1, the grinding efficiency of the outer side of the steel pipe 1 is higher than that of the inner side, which can easily lead to over-grinding of the outer side of the steel pipe 1. This can easily result in the steel pipe after processing and grinding no longer meeting the requirements for production and use.

[0007] Therefore, a grinding device and grinding method for steel pipe processing and production are proposed to address the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a grinding device and grinding method for steel pipe processing and production, in order to solve the problem mentioned in the background art that "due to the difference in linear velocity between the inner and outer sides of the steel pipe during rotation, there will be a problem of asynchronous grinding between the inner and outer sides. For example, the grinding efficiency of the outer side of the steel pipe is higher than that of the inner side of the steel pipe, which leads to the problem of over-grinding on the outer side of the steel pipe, which easily results in the steel pipe after processing and grinding no longer meeting the production and use requirements".

[0009] To achieve the above objectives, the present invention provides the following technical solution: a grinding device for steel pipe processing and production, comprising a cylindrical outer grinding component, a cylindrical inner grinding component, and a base, wherein the outer grinding component and the inner grinding component are respectively in contact with the outer and inner sides of the steel pipe, and when the steel pipe moves relative to the outer and inner grinding components, the relative speed between the inside of the steel pipe and the inner grinding component is the same as the relative speed between the outside of the steel pipe and the outer grinding component;

[0010] The top of the base is fixedly connected to a second support ring, and a second rotating cylinder is provided inside the second support ring. A cone cylinder is slidably connected to the outside of the second rotating cylinder. A hydraulic rod is fixedly connected to the outside of the second rotating cylinder. The movable end of the hydraulic rod is fixedly connected to the inner side of one end of the cone cylinder. Four synchronizing rods are evenly slidably connected to the inner side of one end of the second rotating cylinder. A pressure plate is fixedly connected to one side of the synchronizing rod inside the second rotating cylinder. A rotating wheel is fixedly connected to one side of the synchronizing rod outside the second rotating cylinder.

[0011] A third spring is provided on the outer side of the synchronizing rod. The two ends of the third spring are fixedly connected to the outer side of the second rotating cylinder and one side of the rotating wheel, respectively. The outer side of the rotating wheel is slidably connected to the inner side of the cone. The horizontal movement of the cone realizes the pressing and fixing of the steel pipe by the four synchronizing rods.

[0012] Under the above settings, when the grinding device of the present invention is used, it can make the relative movement speed between the inside of the steel pipe and the inner grinding part the same as the relative movement speed between the outside of the steel pipe and the outer grinding part, so as to keep the inside and outside of the steel pipe at a synchronous grinding speed and efficiency, avoid the phenomenon of over-grinding on one side of the steel pipe, and increase the pass rate of steel pipe processing.

[0013] This invention enables the fixing of steel pipes of different diameters. During fixing, the steel pipe is placed inside the second rotating drum, and then the movable end of the hydraulic rod is contracted, causing the cone to move away from the third motor. During the movement of the cone, the inner side of the cone continuously presses the rotating wheel on the synchronizing rod, where the rotating wheel is used to reduce friction. This causes the synchronizing rod to overcome the elastic force of the third spring and move towards the steel pipe, thereby causing the pressure plate on the synchronizing rod to abut against and continuously press the steel pipe, thus fixing the steel pipe inside the second rotating drum. At the same time, during the fixing process, the center line of the steel pipe remains concentric with the second rotating drum, preventing eccentricity during subsequent rotation and grinding.

[0014] Preferably, a second rotating cylinder is rotatably connected to the second support ring via a bearing, and a third motor is fixedly connected to the top of the base, with the end of the main shaft of the third motor fixedly connected to the center of one end of the second rotating cylinder.

[0015] When the second rotating drum is rotatably connected to the inner side of the second support ring through the bearing, the rotation of the third motor will drive the second rotating drum and the steel pipe fixed inside it to rotate synchronously.

[0016] Preferably, a connecting block is fixedly connected to the top of the base, and a fitting component is provided on the inner side of the connecting block. The movable end of the fitting component is fixedly connected to the inner grinding component. Two connecting plates are fixedly connected to one side of the connecting block. A sliding rod is slidably connected to the inner side of the connecting plate. A synchronization box is fixedly connected to the top of the sliding rod, and an outer grinding component is fixedly connected to the output end of the synchronization box.

[0017] Preferably, the bottom end of the slide rod is fixedly connected to a threaded portion, and a fastening plate is slidably connected to the outside of the threaded portion. A first spring is provided on the outside of the slide rod, and the two ends of the first spring are respectively attached to the bottom end of the connecting plate and the top end of the fastening plate on the lower side.

[0018] Preferably, a first motor is fixedly connected to the outside of the synchronization box, the end of the main shaft of the first motor extends into the inside of the synchronization box and is fixedly connected to a worm gear, a worm wheel is rotatably connected to the inside of the synchronization box, the worm gear and the worm wheel mesh with each other, the worm wheel is coaxially arranged with the outer grinding part, and the relative speed compensation is achieved by the opposite rotation of the outer grinding part and the steel pipe.

[0019] Under the above settings, before grinding, the outer grinding part and the inner grinding part are kept in contact with the outer and inner sides of the steel pipe, respectively. During grinding, the steel pipe is rotated by the third motor to achieve grinding. In order to overcome the grinding difference caused by the different linear speeds of the inner and outer sides of the steel pipe, the present invention sets the outer grinding part to a rotating state, and its rotation direction is opposite to the rotation direction of the steel pipe, thereby forming speed compensation at the grinding point, which facilitates the synchronous grinding of the inner and outer sides of the steel pipe. The rotation method of the outer grinding part is that the rotation of the first motor drives the worm to rotate, the rotation of the worm drives the worm wheel to rotate, and the rotation of the worm wheel drives the outer grinding part to rotate to achieve relative speed compensation during grinding.

[0020] The outer grinding part will have a downward force under the action of the first spring, thus maintaining its contact with the outside of the steel pipe. The set tight-fitting plate is screwed to the threaded part, that is, the tight-fitting plate can be adjusted up and down by rotation. After the position of the tight-fitting plate changes, the tension of the first spring on the outer grinding part will change, thereby changing the contact force between the outer grinding part and the outside of the steel pipe. When maintaining synchronous grinding, the contact force between the inner grinding part and the inside of the steel pipe and the contact force between the outer grinding part and the outside of the steel pipe should be made as similar as possible. Alternatively, the contact force between the outer grinding part and the outside of the steel pipe can be reduced to achieve the function of grinding degree compensation and differentiation.

[0021] Preferably, the inner side of the second support ring is fixedly connected to the outer side of the second rotating cylinder, the top end of the base is fixedly connected to a second motor and a support member, the top end of the base is fixedly connected to a first support ring, the inner side of the first support ring is rotatably connected to a first rotating cylinder, the inner side of the first rotating cylinder is fixedly connected to a gear ring, the end of the main shaft of the second motor is fixedly connected to a gear, the outer side of the gear meshes with the inner side of the gear ring, and one end of the first rotating cylinder is fixedly connected to a rotating ring.

[0022] Preferably, a continuously variable transmission (CVT) is fixedly connected to the top of the support member. The input end of the CVT is fixedly connected to the output shaft of the second motor, and the output end of the CVT is fixedly connected to the turntable. The relative movement speed of the grinding positions on the inner and outer sides is made the same through the speed regulation function of the CVT.

[0023] When the inner side of the second support ring is fixedly connected to the outer side of the second rotating cylinder, the steel pipe remains stationary during grinding. The inner and outer grinding parts are placed on the inner and outer sides of the steel pipe, respectively, so that the inner and outer grinding parts revolve around the center of the steel pipe to achieve grinding. Specifically, when the second motor rotates, it drives the gear to rotate. The gear drives the first rotating cylinder and the rotating ring to rotate through the gear ring. At the same time, when the second motor rotates, it drives the turntable to rotate through the continuously variable transmission. The rotation of the turntable and the rotating ring will drive the inner and outer grinding parts on its upper side to revolve around the center of the steel pipe to achieve grinding. During the grinding process, because of the presence of the continuously variable transmission, the speed can be adjusted by the continuously variable transmission to make the relative movement speed of the inner and outer sides of the steel pipe the same during grinding, thereby achieving the effect of synchronous grinding of the inner and outer sides.

[0024] Preferably, both the turntable and the ring are provided with bonding components on their inner sides, and the movable ends of the bonding components on the turntable and the ring are fixedly connected to the inner grinding component and the outer grinding component, respectively.

[0025] Preferably, the bonding component includes a slot, a limiting rod is fixedly connected to the inner side of the slot, a slider is slidably connected to the outer side of the limiting rod, the slider is the movable end of the bonding component, a second spring is provided on the outer side of the limiting rod, and the two ends of the second spring are fixedly connected to one end of the slider and the inner side of the slot, respectively.

[0026] Under the above configuration, the bonding component of the present invention can play the role of distance compensation and keep the inner and outer grinding parts in interference contact with the inner and outer sides of the steel pipe respectively, ensuring the continuous grinding. The bonding component includes a limiting rod and a slider sliding on the limiting rod. Under the action of the second spring, the slider moves closer to the steel pipe, thereby realizing the functions of distance compensation and interference contact.

[0027] A grinding method for steel pipe processing and production, comprising the following steps:

[0028] S1: The rotation of the third motor drives the second drum and the steel pipe to rotate. The rotation speed of the steel pipe v1 is obtained by the rotation speed of the third motor. The unit of rotation speed v1 is r / min.

[0029] S2: Obtain the inner radius r1, outer radius r2, wall thickness d, and outer grinding radius r3 of the steel pipe by measuring or consulting the steel pipe instruction manual;

[0030] S3: Obtain the extra distance traveled per minute between the outer edge and the inner edge of the steel pipe, s = 2π*v1, or s = 2πd*v1, which is the compensation amount required per minute for the grinding part when the grinding speed inside and outside the steel pipe is the same, where d is the wall thickness of the steel pipe.

[0031] S4: Calculate the compensation rotational speed of the external grinding part: v2 = s / 2πr3;

[0032] S5: Control the first motor to maintain the external grinding part at the rotation speed v2.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. A grinding device for steel pipe processing and production. When in use, the grinding device of the present invention can make the relative movement speed between the inside of the steel pipe and the inner grinding part the same as the relative movement speed between the outside of the steel pipe and the outer grinding part, so as to maintain the synchronous grinding speed and efficiency of the inside and outside of the steel pipe, avoid the phenomenon of over-grinding on one side of the steel pipe, and increase the pass rate of steel pipe processing.

[0035] 2. This invention relates to a grinding device for steel pipe processing and production. The device can fix steel pipes of different diameters. During fixing, the steel pipe is placed inside the second rotating drum, and then the movable end of the hydraulic rod retracts, causing the cone to move away from the third motor. During the movement of the cone, the inner side of the cone continuously presses against the rotating wheel on the synchronous rod. The rotating wheel reduces friction, causing the synchronous rod to overcome the elastic force of the third spring and move towards the steel pipe. This causes the pressure plate on the synchronous rod to press against and continuously tighten the steel pipe, thus fixing the steel pipe inside the second rotating drum. Simultaneously, during the fixing process, the centerline of the steel pipe remains concentric with the second rotating drum, preventing eccentricity during subsequent rotational grinding.

[0036] 3. This grinding device for steel pipe processing and production involves, before grinding, keeping the outer grinding part and the inner grinding part in contact with the outer and inner sides of the steel pipe, respectively. During grinding, the steel pipe is rotated by a third motor to achieve grinding. To overcome the grinding difference caused by the different linear velocities of the inner and outer sides of the steel pipe, the invention sets the outer grinding part to a rotating state, and its rotation direction is opposite to the rotation direction of the steel pipe, thereby forming speed compensation at the grinding point, which facilitates synchronous grinding of the inner and outer sides of the steel pipe. The rotation method of the outer grinding part is as follows: the rotation of the first motor drives the worm gear to rotate, the rotation of the worm gear drives the worm wheel to rotate, and the rotation of the worm wheel drives the outer grinding part to rotate, thereby achieving relative speed compensation during grinding.

[0037] 4. In this steel pipe processing and production grinding device, the outer grinding part has a downward force under the action of the first spring, thus maintaining its contact with the outside of the steel pipe. The set tight-fitting plate is spirally connected to the threaded part, that is, the tight-fitting plate can be adjusted up and down by rotation. After the position of the tight-fitting plate changes, the tension of the first spring on the outer grinding part will change, thereby changing the contact force between the outer grinding part and the outside of the steel pipe. When maintaining synchronous grinding, the contact force between the inner grinding part and the inside of the steel pipe and the contact force between the outer grinding part and the outside of the steel pipe should be made as equal as possible. Alternatively, the grinding degree can be compensated and differentiated by reducing the contact force between the outer grinding part and the outside of the steel pipe.

[0038] 5. This grinding device for steel pipe processing and production, when the inner side of the second support ring is fixedly connected to the outer side of the second rotating cylinder, the steel pipe remains stationary during grinding. The inner grinding part and the outer grinding part are placed on the inner and outer sides of the steel pipe respectively, so that the inner grinding part and the outer grinding part revolve around the center of the steel pipe to achieve grinding of the steel pipe. Specifically, when the second motor rotates, it drives the gear to rotate. The gear drives the first rotating cylinder and the rotating ring to rotate through the gear ring. At the same time, when the second motor rotates, it drives the turntable to rotate through the continuously variable transmission. The rotation of the turntable and the rotating ring will drive the inner grinding part and the outer grinding part on its upper side to revolve around the center of the steel pipe to achieve grinding of the steel pipe. During the grinding process, because of the presence of the continuously variable transmission, the speed can be adjusted by the continuously variable transmission to make the relative movement speed of the inner and outer sides of the steel pipe the same during grinding, thereby achieving the effect of synchronous grinding of the inner and outer sides.

[0039] 6. The grinding device for steel pipe processing and production, wherein the bonding component of the present invention can play a role in distance compensation and keep the inner grinding part and the outer grinding part in interference contact with the inner and outer sides of the steel pipe respectively, so as to ensure the continuous grinding. The bonding component includes a limiting rod and a slider sliding on the limiting rod. Under the action of the second spring, the slider moves closer to the steel pipe, thereby realizing the functions of distance compensation and interference contact. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a steel pipe structure in the prior art;

[0041] Figure 2 This is a schematic diagram of a structure in the existing technology where the inner and outer sides of a steel pipe are ground simultaneously.

[0042] Figure 3 This is a schematic diagram of the overall appearance structure of the first embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the front sectional view of the first embodiment of the present invention;

[0044] Figure 5 This is a cross-sectional view of the grinding surface during grinding, as shown in the first embodiment of the present invention.

[0045] Figure 6 This is a schematic diagram of the internal structure of the synchronization box in the first embodiment of the present invention;

[0046] Figure 7 This is a cross-sectional view of the steel pipe drive mechanism of the present invention.

[0047] Figure 8 This is a cross-sectional view of the structure during grinding in the second embodiment of the present invention;

[0048] Figure 9 This is a cross-sectional view of the rotating cylinder in the second embodiment of the present invention.

[0049] Figure 10 This is a schematic diagram of the overall structure of the rotating drum in the second embodiment of the present invention;

[0050] Figure 11 This is a schematic diagram of the bonding component in this invention.

[0051] In the diagram: 1. Steel pipe; 2. Internal grinding part; 3. External grinding part; 4. Base; 5. Connecting block; 6. Slider; 7. Sliding rod; 8. Fitting plate; 9. Threaded part; 10. First spring; 11. Connecting plate; 12. First motor; 13. Synchronizing box; 14. Limiting rod; 15. Second spring; 16. Worm gear; 17. Worm wheel; 18. Turntable; 19. Support component; 20. Continuously variable transmission; 21. Rotary ring; 22. Gear ring; 23. Second motor; 24. Gear; 25. First rotating drum; 26. First support ring; 27. Third motor; 28. Second support ring; 29. ​​Conical cylinder; 30. Synchronizing rod; 31. Pressure plate; 32. Third spring; 33. Rotary wheel; 34. Hydraulic rod; 35. Second rotating drum; 36. Empty slot. Detailed Implementation

[0052] 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.

[0053] Example 1

[0054] Please see Figures 1-7 and Figure 11 The present invention provides a technical solution:

[0055] A grinding device for steel pipe processing includes a cylindrical outer grinding part 3, a cylindrical inner grinding part 2, and a base 4. The outer grinding part 3 and the inner grinding part 2 are respectively attached to the outer and inner sides of the steel pipe 1. When the steel pipe 1 moves relative to the outer grinding part 3 and the inner grinding part 2, the relative speed between the inside of the steel pipe 1 and the inner grinding part 2 is the same as the relative speed between the outside of the steel pipe 1 and the outer grinding part 3.

[0056] The top of the base 4 is fixedly connected to the second support ring 28. The second support ring 28 is provided with a second rotating cylinder 35. The outer side of the second rotating cylinder 35 is slidably connected to the cone cylinder 29. The outer side of the second rotating cylinder 35 is fixedly connected to the hydraulic rod 34. The movable end of the hydraulic rod 34 is fixedly connected to the inner side of one end of the cone cylinder 29. Four synchronous rods 30 are evenly slidably connected to the inner side of one end of the second rotating cylinder 35. The synchronous rod 30 is fixedly connected to the pressure plate 31 on one side inside the second rotating cylinder 35. The synchronous rod 30 is fixedly connected to the wheel 33 on one side outside the second rotating cylinder 35.

[0057] A third spring 32 is provided on the outer side of the synchronizing rod 30. The two ends of the third spring 32 are fixedly connected to the outer side of the second rotating cylinder 35 and one side of the rotating wheel 33, respectively. The outer side of the rotating wheel 33 is slidably connected to the inner side of the cone cylinder 29. The horizontal movement of the cone cylinder 29 realizes the pressing and fixing of the four synchronizing rods 30 on the steel pipe 1.

[0058] Under the above settings, when the grinding device of the present invention is used, it can make the relative movement speed between the inside of the steel pipe 1 and the inner grinding part 2 and the relative movement speed between the outside of the steel pipe 1 and the outer grinding part 3 the same, so that the inside and outside of the steel pipe 1 maintain synchronous grinding speed and efficiency, avoid the phenomenon of over-grinding on one side of the steel pipe 1, and increase the pass rate of the steel pipe 1 processing.

[0059] This invention enables the fixing of steel pipes 1 of different diameters. During fixing, the steel pipe 1 is placed inside the second rotating drum 35, and then the movable end of the hydraulic rod 34 is contracted, causing the cone 29 to move away from the third motor 27. During the movement of the cone 29, the inner side of the cone 29 continuously presses the rotating wheel 33 on the synchronizing rod 30. The rotating wheel 33 is used to reduce friction, so that the synchronizing rod 30 overcomes the elastic force of the third spring 32 and moves towards the steel pipe 1. This causes the pressure plate 31 on the synchronizing rod 30 to abut against and continuously press the steel pipe 1, thereby fixing the steel pipe 1 inside the second rotating drum 35. At the same time, during the fixing process, the center line of the steel pipe 1 will remain concentric with the second rotating drum 35 to prevent eccentricity during subsequent rotation and grinding.

[0060] Specifically, a second rotating cylinder 35 is rotatably connected to the second support ring 28 via a bearing, and a third motor 27 is fixedly connected to the top of the base 4. The end of the main shaft of the third motor 27 is fixedly connected to the center of one end of the second rotating cylinder 35.

[0061] When the second rotating drum 35 is rotatably connected to the inner side of the second support ring 28 through the bearing, the third motor 27 will drive the second rotating drum 35 and the steel pipe 1 fixed inside it to rotate synchronously when it rotates.

[0062] Specifically, a connecting block 5 is fixedly connected to the top of the base 4, and a fitting component is provided on the inner side of the connecting block 5. The movable end of the fitting component is fixedly connected to the inner polishing component 2. Two connecting plates 11 are fixedly connected to one side of the connecting block 5. A slide rod 7 is slidably connected to the inner side of the connecting plate 11. A synchronization box 13 is fixedly connected to the top of the slide rod 7, and an outer polishing component 3 is fixedly connected to the output end of the synchronization box 13.

[0063] Specifically, the bottom end of the slide rod 7 is fixedly connected to a threaded part 9, and the outer side of the threaded part 9 is slidably connected to a pressing plate 8. A first spring 10 is provided on the outer side of the slide rod 7, and the two ends of the first spring 10 are respectively attached to the bottom end of the lower connecting plate 11 and the top end of the pressing plate 8.

[0064] Specifically, a first motor 12 is fixedly connected to the outside of the synchronization box 13. The end of the main shaft of the first motor 12 extends into the inside of the synchronization box 13 and is fixedly connected to a worm gear 16. A worm wheel 17 is rotatably connected to the inside of the synchronization box 13. The worm gear 16 and the worm wheel 17 mesh with each other. The worm wheel 17 is coaxially arranged with the outer grinding part 3. The relative speed compensation is achieved by the opposite rotation of the outer grinding part 3 and the steel pipe 1.

[0065] Under the above settings, before grinding, the outer grinding part 3 and the inner grinding part 2 are kept in contact with the outer and inner sides of the steel pipe 1, respectively. During grinding, the steel pipe 1 is rotated by the third motor 27 to achieve grinding. In order to overcome the grinding difference caused by the different linear speeds of the inner and outer sides of the steel pipe 1, the present invention sets the outer grinding part 3 to a rotating state, and its rotation direction is opposite to the rotation direction of the steel pipe 1, so as to form speed compensation at the grinding point, which facilitates the synchronous grinding of the inner and outer sides of the steel pipe 1. The rotation method of the outer grinding part 3 is that the first motor 12 rotates to drive the worm gear 16 to rotate, the rotation of the worm gear 16 will drive the worm wheel 17 to rotate, and the rotation of the worm wheel 17 will drive the outer grinding part 3 to rotate to achieve relative speed compensation during grinding.

[0066] The outer grinding part 3 will have a downward force under the action of the first spring 10, thus maintaining its contact with the outside of the steel pipe 1. The tight-fitting plate 8 is screwed to the threaded part 9, that is, the tight-fitting plate 8 can be adjusted up and down by rotation. After the position of the tight-fitting plate 8 changes, the tension of the first spring 10 on the outer grinding part 3 will change, thereby changing the contact force between the outer grinding part 3 and the outside of the steel pipe 1. When maintaining synchronous grinding, the contact force between the inner grinding part 2 and the inside of the steel pipe 1 and the contact force between the outer grinding part 3 and the outside of the steel pipe 1 should be made as similar as possible. Alternatively, the contact force between the outer grinding part 3 and the outside of the steel pipe 1 can be reduced to achieve the function of grinding degree compensation and differentiation.

[0067] Example 2

[0068] This embodiment is a further improvement on embodiment 1. Please refer to [link / reference]. Figure 1 , Figure 2 , Figures 7-11 The inner side of the second support ring 28 is fixedly connected to the outer side of the second rotating drum 35. The top of the base 4 is fixedly connected to the second motor 23 and the support member 19. The top of the base 4 is fixedly connected to the first support ring 26. The inner side of the first support ring 26 is rotatably connected to the first rotating drum 25. The inner side of the first rotating drum 25 is fixedly connected to the gear ring 22. The end of the main shaft of the second motor 23 is fixedly connected to the gear 24. The outer side of the gear 24 meshes with the inner side of the gear ring 22. One end of the first rotating drum 25 is fixedly connected to the rotating ring 21.

[0069] Specifically, a continuously variable transmission (CVT) 20 is fixedly connected to the top of the support member 19. The input end of the CVT 20 is fixedly connected to the output shaft of the second motor 23, and the output end of the CVT 20 is fixedly connected to the turntable 18. The relative movement speed of the grinding positions on the inner and outer sides is made the same through the speed regulation function of the CVT 20.

[0070] When the inner side of the second support ring 28 is fixedly connected to the outer side of the second rotating cylinder 35, during grinding, the steel pipe 1 remains stationary. The inner grinding part 2 and the outer grinding part 3 are placed on the inner and outer sides of the steel pipe 1 respectively, so that the inner grinding part 2 and the outer grinding part 3 revolve around the center of the steel pipe 1 to achieve grinding of the steel pipe 1. Specifically, when the second motor 23 rotates, it will drive the gear 24 to rotate. The gear 24 drives the first rotating cylinder 25 and the rotating ring 21 to rotate through the gear ring 22. At the same time, when the second motor 23 rotates, it drives the turntable 18 to rotate through the continuously variable transmission 20. The rotation of the turntable 18 and the rotating ring 21 will drive the inner grinding part 2 and the outer grinding part 3 on its upper side to revolve around the center of the steel pipe 1 to achieve grinding of the steel pipe 1. During the grinding process, because of the presence of the continuously variable transmission 20, the speed can be adjusted by the continuously variable transmission 20 to make the relative movement speed of the inner and outer sides of the steel pipe 1 the same during grinding, thereby achieving the effect of synchronous grinding of the inner and outer sides.

[0071] Specifically, both the inner sides of the turntable 18 and the ring 21 are provided with bonding components, and the movable ends of the bonding components on the turntable 18 and the ring 21 are fixedly connected to the inner polishing component 2 and the outer polishing component 3, respectively.

[0072] Specifically, the bonding component includes an empty groove 36, with a limiting rod 14 fixedly connected to the inner side of the empty groove 36, and a slider 6 slidably connected to the outer side of the limiting rod 14. The slider 6 is the movable end of the bonding component, and a second spring 15 is provided on the outer side of the limiting rod 14. The two ends of the second spring 15 are fixedly connected to one end of the slider 6 and the inner side of the empty groove 36, respectively.

[0073] Under the above configuration, the bonding component of the present invention can play the role of distance compensation and keep the inner grinding component 2 and the outer grinding component 3 in interference contact with the inner and outer sides of the steel pipe 1, respectively, to ensure the continuous grinding. The bonding component includes a limiting rod 14 and a slider 6 sliding on the limiting rod 14. Under the action of the second spring 15, the slider 6 moves closer to the steel pipe 1, thereby realizing the functions of distance compensation and interference contact.

[0074] This invention also discloses a grinding method for steel pipe processing and production, the steps of which are as follows:

[0075] S1: The rotation of the third motor 27 drives the second drum 35 and the steel pipe 1 to rotate. The rotation speed v1 of the steel pipe 1 is obtained by the rotation speed of the third motor 27. The unit of rotation speed v1 is r / min.

[0076] S2: Obtain the inner radius r1, outer radius r2, wall thickness d, and outer grinding radius r3 of steel pipe 1 by measuring or referring to the instruction manual of steel pipe 1;

[0077] S3: Obtain the extra distance traveled per minute between the outer edge and the inner edge of the steel pipe, s = 2πr2 - r1*v1, i.e., s = 2πd*v1, which is the compensation amount required per minute for the grinding part 3 when the grinding speed of the inner and outer parts of the steel pipe 1 is the same, where d is the wall thickness of the steel pipe.

[0078] S4: Calculate the compensation rotational speed v2 = s / 2πr3 for the outer grinding part 3;

[0079] S5: Control the first motor 12 to maintain the outer grinding part 3 at the rotation speed v2.

[0080] 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. A grinding device for steel pipe processing, comprising a cylindrical outer grinding component (3), a cylindrical inner grinding component (2), and a base (4), characterized in that: The outer grinding part (3) and the inner grinding part (2) are respectively attached to the outer and inner sides of the steel pipe (1). When the steel pipe (1) moves relative to the outer grinding part (3) and the inner grinding part (2), the relative speed between the inside of the steel pipe (1) and the inner grinding part (2) is the same as the relative speed between the outside of the steel pipe (1) and the outer grinding part (3). The top of the base (4) is fixedly connected to a second support ring (28). A second rotating cylinder (35) is provided inside the second support ring (28). A cone cylinder (29) is slidably connected to the outside of the second rotating cylinder (35). A hydraulic rod (34) is fixedly connected to the outside of the second rotating cylinder (35). The movable end of the hydraulic rod (34) is fixedly connected to the inner side of one end of the cone cylinder (29). Four synchronizing rods (30) are evenly slidably connected to the inner side of one end of the second rotating cylinder (35). A pressure plate (31) is fixedly connected to one side of the synchronizing rod (30) inside the second rotating cylinder (35). A rotating wheel (33) is fixedly connected to one side of the synchronizing rod (30) outside the second rotating cylinder (35). A third spring (32) is provided on the outside of the synchronizing rod (30). The two ends of the third spring (32) are fixedly connected to the outside of the second rotating cylinder (35) and one side of the rotating wheel (33), respectively. The outside of the rotating wheel (33) is slidably connected to the inside of the cone (29). The horizontal movement of the cone (29) realizes the pressing and fixing of the synchronizing rod (30) on the steel pipe (1). The second support ring (28) is rotatably connected to the second rotating cylinder (35) via a bearing. The top of the base (4) is fixedly connected to the third motor (27). The end of the main shaft of the third motor (27) is fixedly connected to the center of one end of the second rotating cylinder (35). A connecting block (5) is fixedly connected to the top of the base (4). A fitting component is provided on the inner side of the connecting block (5). The movable end of the fitting component is fixedly connected to the inner polishing component (2). Two connecting plates (11) are fixedly connected to one side of the connecting block (5). A slide rod (7) is slidably connected to the inner side of the connecting plate (11). A synchronization box (13) is fixedly connected to the top of the slide rod (7). An outer polishing component (3) is fixedly connected to the output end of the synchronization box (13). The bottom end of the slide rod (7) is fixedly connected to a threaded part (9), and the outer side of the threaded part (9) is slidably connected to a pressing plate (8). A first spring (10) is provided on the outer side of the slide rod (7), and the two ends of the first spring (10) are respectively attached to the bottom end of the connecting plate (11) on the lower side and the top end of the pressing plate (8). The outer side of the synchronization box (13) is fixedly connected to a first motor (12). The end of the main shaft of the first motor (12) extends into the inner side of the synchronization box (13) and is fixedly connected to a worm (16). The inner side of the synchronization box (13) is rotatably connected to a worm wheel (17). The worm (16) and the worm wheel (17) mesh with each other. The worm wheel (17) is coaxially arranged with the outer grinding part (3). The relative speed compensation is achieved by the opposite rotation of the outer grinding part (3) and the steel pipe (1). The grinding method of this device: S1: The rotation of the third motor (27) drives the second drum (35) and the steel pipe (1) to rotate. The rotation speed v1 of the steel pipe (1) is obtained by the rotation speed of the third motor (27). The unit of rotation speed v1 is r / min. S2: Obtain the inner radius r1, outer radius r2, steel pipe wall thickness d, and outer grinding part radius r3 of the steel pipe (1) by measuring or consulting the instruction manual of the steel pipe (1); S3: Obtain the extra distance s = 2π(r2-r1)*v1 traveled per minute by the outer edge of the steel pipe compared to the inner edge of the steel pipe, that is, the amount of compensation required per minute for the grinding part (3) when the grinding speed of the inner and outer parts of the steel pipe (1) is the same; S4: Calculate the compensation rotation speed v2 of the external grinding part (3) = ; S5: Control the first motor (12) to maintain the outer grinding part (3) at the rotation speed v2.

2. The grinding device for steel pipe processing and production according to claim 1, characterized in that: The inner side of the second support ring (28) is fixedly connected to the outer side of the second rotating cylinder (35). The top of the base (4) is fixedly connected to the second motor (23) and the support member (19). The top of the base (4) is fixedly connected to the first support ring (26). The inner side of the first support ring (26) is rotatably connected to the first rotating cylinder (25). The inner side of the first rotating cylinder (25) is fixedly connected to the gear ring (22). The end of the main shaft of the second motor (23) is fixedly connected to the gear (24). The outer side of the gear (24) meshes with the inner side of the gear ring (22). One end of the first rotating cylinder (25) is fixedly connected to the rotating ring (21).

3. The grinding device for steel pipe processing and production according to claim 2, characterized in that: The top of the support member (19) is fixedly connected to a continuously variable transmission (20). The input end of the continuously variable transmission (20) is fixedly connected to the output shaft of the second motor (23), and the output end of the continuously variable transmission (20) is fixedly connected to the turntable (18). The speed of the grinding positions on the inner and outer sides is the same through the speed regulation function of the continuously variable transmission (20).

4. The grinding device for steel pipe processing and production according to claim 3, characterized in that: The inner sides of the turntable (18) and the ring (21) are provided with bonding components, and the movable ends of the bonding components on the turntable (18) and the ring (21) are fixedly connected to the inner polishing component (2) and the outer polishing component (3), respectively.

5. A grinding device for steel pipe processing and production according to claim 4, characterized in that: The bonding assembly includes an empty groove (36), with a limiting rod (14) fixedly connected to the inner side of the empty groove (36), and a slider (6) slidably connected to the outer side of the limiting rod (14). The slider (6) is the movable end of the bonding assembly. A second spring (15) is provided on the outer side of the limiting rod (14), and the two ends of the second spring (15) are fixedly connected to one end of the slider (6) and the inner side of the empty groove (36), respectively.

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