Round pipe outer surface grinding device and method

Abstract

The invention relates to the technical field of metal pipe surface treatment, and discloses a round pipe outer surface grinding device and method.The transverse driving mechanism is arranged on a rack and comprises a linear module, the output end of the linear module is connected with a driving motor, the driving motor is rotationally connected with a round pipe electric clamp, and the round pipe electric clamp is used for clamping the end of a round pipe; the driving motor drives the circular tube to transversely move and rotate through the circular tube electric clamp; the polishing mechanism is arranged on the rack, comprises a liftable electric polishing wheel and is used for polishing the outer surface of the circular pipe; the pipe supporting mechanism is arranged on the rack and close to the polishing mechanism, and the pipe supporting mechanism is oppositely provided with a liftable positioning roller used for limiting the round pipe during polishing; the transverse driving mechanism is matched with the driving motor, the constant rotating speed and stable axial movement are matched with the stable grinding pressure controlled by the grinding mechanism, the grinding uniformity and consistency of the outer surface of the circular pipe are ensured, and the problem that the depth of manual grinding is different is solved.

Description

Technical Field

[0001] This invention relates to the field of metal pipe surface treatment technology, and in particular to a grinding device and method for the outer surface of a round pipe. Background Technology

[0002] In numerous industrial fields such as petrochemicals, steel structures in construction, and fluid transportation, metal round tubes are widely used in various core equipment and conveying systems due to their excellent mechanical properties, good conveying characteristics, and convenient connection methods, becoming an indispensable key basic component. During factory processing, on-site welding and assembly, and long-term service, the outer surface of these metal round tubes is prone to defects such as rust, oxide scale, and weld spatter. These defects not only affect the appearance quality of the round tubes but also reduce their corrosion resistance, shorten their service life, and may even cause stress concentration due to surface defects, posing a hidden danger to subsequent process implementation and the safe and stable operation of the overall system.

[0003] Rust removal, polishing, or weld spatter removal from the outer surface of metal tubes are essential processes for ensuring product quality and improving equipment reliability in related fields, directly impacting the safety, stability, and economy of industrial production. Currently, the industry primarily employs two technical solutions for treating the outer surface of metal tubes; however, both solutions have insurmountable defects and shortcomings, failing to fully meet the diverse and sophisticated production demands of today. The first option involves manual operation using a handheld angle grinder on-site. This method relies on operators manually controlling the grinder to grind the outer surface of the round tube, and is highly susceptible to human error. Firstly, operators must hold the equipment for extended periods, resulting in extremely high labor intensity and low efficiency, making it unsuitable for large-scale production. Secondly, the grinding quality depends entirely on the operator's skill and responsibility; variations in technique, force, and path among operators lead to inconsistent surface treatment quality even within the same batch or the same round tube, failing to guarantee uniformity and stability of the treatment effect. More importantly, during manual operation, operators must be in close contact with the high-speed rotating grinding components, posing safety risks such as mechanical injury. Furthermore, the large amount of metal dust generated during grinding permeates the working environment, seriously endangering the operator's respiratory health and failing to meet the safety and environmental protection requirements of modern industrial production.

[0004] The second option is to use large-scale specialized polishing machines for automated processing. These machines achieve automatic grinding of the outer surface of round tubes through mechanized structures. While this improves operational efficiency and the stability of processing quality to some extent, it still has significant drawbacks: First, the overall structure of the equipment is complex, and the core components require high precision machining, resulting in high equipment costs and significantly increasing the equipment investment costs for many small and medium-sized enterprises. Second, existing large-scale specialized polishing machines are mostly customized designs; their grinding mechanisms, clamping mechanisms, and other core components are adapted for specific tube diameters and processing techniques. If different diameters or types of defects need to be processed, large-scale modifications or replacement with specialized equipment are required, resulting in extremely poor equipment flexibility. Third, these machines were originally designed for continuous production of large batches of single-specification round tubes. However, the proportion of multi-variety, small-batch orders in current industrial production is increasing year by year. Large-scale specialized polishing machines cannot adapt to this flexible production demand of multiple specifications and small batches, leading to low equipment utilization and further increasing production costs for enterprises. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a grinding device and method for the outer surface of a round tube. The transverse drive mechanism works in conjunction with the drive motor to achieve a constant rotational speed and smooth axial movement. Combined with the stable grinding pressure controlled by the grinding mechanism, this ensures the uniformity and consistency of grinding the outer surface of the round tube, avoiding the problem of inconsistent depths caused by manual grinding.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, a grinding device for the outer surface of a circular tube includes: frame; A transverse drive mechanism, mounted on a frame, includes a linear module. The output end of the linear module is connected to a drive motor. The drive motor is rotatably connected to a round tube electric clamp. The round tube electric clamp is used to clamp the end of the round tube. The drive motor drives the round tube to move laterally and rotate through the round tube electric clamp. The grinding mechanism, mounted on the frame, includes a liftable electric grinding wheel for grinding the outer surface of the round tube; The pipe support mechanism is located on the frame and close to the grinding mechanism. The pipe support mechanism is equipped with a liftable positioning roller to limit the round pipe during grinding.

[0007] As a further implementation, the lateral drive mechanism includes a ball screw linear module, the output end of which is provided with a drive plate, and a drive motor is mounted on the drive plate, which drives the drive motor to move laterally.

[0008] As a further implementation, the circular tube electric clamp is rotatably connected to the housing of the drive motor via bearings, and the output end of the drive motor is connected to the circular tube electric clamp.

[0009] As a further implementation, a conical top is provided at the middle position of the electric clamp for the circular tube, and the conical top is inserted into the inside of the circular tube to achieve positioning.

[0010] As a further implementation, the grinding mechanism is a hydraulic lifting grinding mechanism, which includes a main hydraulic component and an electric grinding wheel located at the output end of the main hydraulic component to achieve lifting.

[0011] As a further implementation, the pipe support mechanism is located on both sides of the grinding mechanism. Each set of pipe support mechanisms includes two sets of oppositely arranged auxiliary hydraulic components. The output end of the auxiliary hydraulic components is connected to the positioning rollers through the roller frame. The round pipe can move between the two sets of positioning rollers on each set of pipe support mechanisms. The distance between the positioning rollers on the two sets of oppositely arranged auxiliary hydraulic components is adjustable.

[0012] As a further implementation, the roller frame is U-shaped, and the positioning rollers are mounted on the roller frame, with at least two positioning rollers mounted on each roller frame.

[0013] As a further implementation, a collection box is also included, which is equipped with a chip collection hopper. The position of the chip collection hopper corresponds to the position of the grinding mechanism and is used to collect grinding debris and dust.

[0014] As a further implementation, the bottom of the collection box is equipped with wheels.

[0015] Secondly, a method for polishing the outer surface of a circular tube, using any of the polishing devices described above, includes the following steps: Insert one end of the round tube to be ground into the electric round tube clamp and fix it. Adjust the spacing of the relatively set positioning rollers according to the diameter of the round tube to ensure that the round tube can be stably supported. The electric grinding wheel of the grinding mechanism descends and contacts the outer surface of the round tube. The preset grinding pressure is then activated, and the horizontal drive mechanism and drive motor are started, so that the round tube can move laterally and rotate at the same time. During the process, the electric grinding wheel continuously grinds the outer surface of the round tube.

[0016] The beneficial effects of the present invention are as follows: This invention achieves automatic rotation and axial feeding of the round tube through a transverse drive mechanism, combined with an automatic lifting grinding mechanism, realizing full automation of the grinding process for the outer surface of the round tube. One person can operate multiple machines, significantly improving production efficiency. The transverse drive mechanism, in conjunction with the drive motor, ensures a constant rotational speed and smooth axial movement, along with stable grinding pressure controlled by the grinding mechanism, guaranteeing the uniformity and consistency of the grinding on the outer surface of the round tube, avoiding the problem of uneven grinding depth caused by manual grinding. Through a hydraulic lifting support mechanism and a horizontally movable drive mechanism, this device can be quickly adjusted to adapt to round tubes of different lengths and diameters, demonstrating strong versatility. The conical top fixture design further enhances adaptability to different tube diameters. The use of a ball screw linear module and a hydraulic lifting grinding mechanism ensures smooth movement and precise control. The symmetrically arranged support mechanism guarantees the rigidity of the processing process and reduces vibration. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of the grinding device for the outer surface of a circular tube in an embodiment of the present invention; Figure 2 This is a front view of the cylindrical tube outer surface grinding device in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the ball screw linear module in an embodiment of the present invention; Figure 4 This is a schematic diagram of the pipe support unit in an embodiment of the present invention.

[0019] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0020] Among them: 1. rack, 2. Lateral drive mechanism, 201. Ball screw linear module, 202. Drive board, 203. Drive motor , 3. Hydraulic lifting grinding mechanism, 301. Main hydraulic component, 302. Electric grinding wheel; 4. Pipe support mechanism, 401. Auxiliary hydraulic assembly, 402. Roller frame, 403. Positioning roller; 5. Electric clamp for round tubes 6. Chip hopper, 7. Collection box, 8. Conical top fixture. Detailed Implementation

[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] Example 1 In a typical embodiment of the present invention, reference is made to Figures 1-4 As shown, a grinding device for the outer surface of a round tube includes a frame 1, a transverse drive mechanism 2, a grinding mechanism, a tube support mechanism 4, a round tube electric clamp 5, a chip hopper 6, a collection box 7, and a conical top fixture 8. The transverse drive mechanism 2, the grinding mechanism, and the tube support mechanism 4 are mounted on the frame 1, and the grinding mechanism is a hydraulic lifting grinding mechanism 3.

[0023] The frame 1 is the core support structure of the grinding device, and its structural design directly determines the overall rigidity and operational stability of the device. In this embodiment, the frame 1 is made of high-strength carbon steel and welded together. The main frame is a rectangular truss structure, and the truss beams are reinforced with stiffeners to effectively improve the frame's resistance to deformation. Support legs are located at the four corners of the bottom of the frame 1, and the support legs are equipped with adjustable anchor bolts. Operators can precisely adjust the level of the frame by rotating the anchor bolts to prevent vibrations caused by uneven ground during operation, which could affect the grinding accuracy.

[0024] In addition, the connection between the crossbeams and longitudinal beams of frame 1 is made by full welding and is subjected to aging treatment to eliminate welding stress, ensuring that the frame can maintain structural stability under long-term heavy load operation, and providing a solid foundation support for the installation of core components such as the transverse drive mechanism 2 and the grinding mechanism.

[0025] The transverse drive mechanism 2 includes a linear module, the output end of which is connected to a drive motor 203. The drive motor 203 is rotatably connected to a round tube electric clamp 5. The round tube electric clamp 5 is used to clamp the end of the round tube. The drive motor drives the round tube to move laterally and rotate through the round tube electric clamp 5. The grinding mechanism includes a liftable electric grinding wheel for grinding the outer surface of the round tube. The tube support mechanism is mounted on the frame and located close to the grinding mechanism. The tube support mechanism is provided with a liftable positioning roller for limiting the round tube during grinding.

[0026] like Figure 1 and Figure 3As shown, the lateral drive mechanism 2 includes a ball screw linear module 201, which is equipped with a motor and a ball screw assembly. A slider is provided on the ball screw linear module. Under the action of the motor, the slider can move laterally on the ball screw. The slider serves as the output end, and a drive plate is provided on the slider to enable the drive plate to move laterally on the lateral drive mechanism 2. A drive motor 203 is mounted on the drive plate 202, and the lateral drive mechanism 2 can drive the drive motor to move laterally via the drive plate. To prevent dust intrusion, a dustproof telescopic cover is installed on the ball screw linear module 201; the dustproof telescopic cover is existing technology.

[0027] Specifically, the transverse drive mechanism 2, as the core component for realizing the axial feed motion of the round tube, directly affects the uniformity of the grinding trajectory due to its motion accuracy and stability. In this embodiment, the transverse drive mechanism 2 includes a ball screw linear module 201, which is specifically configured with a servo motor and a high-precision ball screw assembly. The servo motor is an AC permanent magnet synchronous servo motor, which has the advantages of fast response speed, high positioning accuracy, and stable operation. Its rated power is 1.5kW, and its rated speed is 3000r / min. It achieves closed-loop position control through an encoder, and the positioning accuracy can reach ±0.01mm, enabling precise control of the axial movement speed and displacement of the round tube. The ball screw assembly uses a high-precision cold-rolled ball screw with a lead of 10mm and a pitch error ≤0.02mm / m. The ball screw and nut are driven by a ball circulation method, which effectively reduces motion friction, improves transmission efficiency, and reduces crawling during the movement.

[0028] The ball screw linear module 201 is equipped with a slider, which is fixedly connected to the screw nut. Driven by a servo motor, the slider can move smoothly laterally along the axial direction of the ball screw. The slider serves as the output end of the lateral drive mechanism, and a drive plate 202 is bolted to its top. The drive plate 202 is made of 45# steel, heat-treated, and precision-milled with a flatness error ≤0.02mm, ensuring the perpendicularity and coaxiality of the drive motor after installation. The lateral movement of the slider synchronously drives the drive plate and the components mounted on it to move laterally, thereby providing power for the axial feed of the circular tube.

[0029] To enable the round tube to move laterally during grinding and to grind different positions, the electric clamp for the round tube is mounted on the housing of the drive motor via a deep groove ball bearing to achieve a rotatable connection. The deep groove ball bearing is a high-precision bearing with a radial runout error of ≤0.005mm, ensuring the stability of the electric clamp for the round tube during rotation.

[0030] The output end of the drive motor 203 is connected to the electric clamp for the round tube 5 via a flexible coupling. The flexible coupling has the functions of buffering, vibration reduction, and compensating for the relative misalignment of the two shafts, which can effectively reduce the impact of the output torque fluctuation of the drive motor 203 on the rotational stability of the round tube. Under the support of the deep groove ball bearing, the drive motor can drive the electric clamp for the round tube 5 to rotate smoothly, thereby driving the round tube to rotate. At the same time, under the drive of the transverse drive mechanism 2, the drive plate can drive the drive motor 203, the electric clamp for the round tube 5, and the round tube to move at a uniform speed along the axial direction (transverse direction), ultimately realizing that the round tube is fed at a uniform speed along the axial direction while rotating, so that the electric grinding wheel 302 can form a continuous and uniform spiral grinding trajectory on the outer surface of the round tube, ensuring full coverage of grinding without any missed areas.

[0031] To ensure the concentricity of the round tube and the electric clamp 5 during rotation and to avoid uneven grinding thickness due to eccentric rotation, a conical top tool 8 is detachably installed at the middle position of the electric clamp 5. The conical top tool 8 is made of alloy tool steel and heat-treated, possessing excellent wear resistance and rigidity.

[0032] The conical clamp has a taper of 1:10. This taper ensures reliable clamping of the inner hole of the round tube and utilizes the self-centering principle of the conical surface to achieve rapid and precise positioning and clamping of round tubes with different wall thicknesses and inner diameters. Specifically, when the conical clamp is inserted into the round tube, the conical surface fits tightly against the inner wall of the tube. Through the guiding action of the conical surface, it can automatically correct the installation deviation of the round tube, keeping the axis of the round tube coincident with the rotation axis of the electric clamp, ensuring that the concentricity error of the round tube during rotation is ≤0.03mm.

[0033] In addition, the conical top tool 8 and the electric clamp for round tubes 5 are connected by threads, allowing operators to replace the conical top tool with one of different sizes according to the inner diameter of the round tube, which further improves the adaptability of the device to round tubes of different specifications.

[0034] like Figure 1 As shown, the hydraulic lifting grinding mechanism 3 includes a main hydraulic component 301, and an electric grinding wheel is located at the output end of the main hydraulic component to achieve lifting.

[0035] The grinding mechanism is a hydraulic lifting grinding mechanism 3. Its core function is to achieve the lifting and lowering of the electric grinding wheel through hydraulic drive, precisely controlling the contact pressure between the grinding wheel and the outer surface of the round tube, thereby ensuring grinding quality. In this embodiment, the main hydraulic component specifically consists of a hydraulic pump, an electromagnetic directional valve, a relief valve, a throttle valve, and a hydraulic cylinder. The hydraulic pump is a variable vane pump, which can provide stable hydraulic power to the hydraulic cylinder. The electromagnetic directional valve is a three-position four-way directional valve, which can achieve precise switching between the three working states of the hydraulic cylinder: extension, retraction, and stop. The relief valve is used to regulate the system working pressure to prevent excessive system pressure from damaging components. The throttle valve is used to regulate the lifting and lowering speed of the hydraulic cylinder, achieving smooth lifting and lowering of the electric grinding wheel. The electric grinding wheel is fixedly installed at the output end of the hydraulic cylinder of the main hydraulic component through a flange, and achieves lifting and lowering movement with the extension and retraction of the hydraulic cylinder.

[0036] In this embodiment, the main hydraulic assembly 301 is bolted to the upper crossbeam of the frame 1, and its installation height is higher than the axis of the electric cylindrical clamp 5. The hydraulic cylinder output end of the main hydraulic assembly 301 is set downward. This installation method allows the electric grinding wheel 302 to descend vertically from above to the outer surface of the cylindrical tube, making it easier for the operator to observe the grinding status. It also facilitates the natural fall of grinding debris, preventing debris from accumulating in the grinding area and affecting the grinding effect.

[0037] The main hydraulic component can achieve smooth lifting and lowering of the electric grinding wheel 302 through precise control of the hydraulic system. The lifting speed can be steplessly adjusted within the range of 0.5-5mm / s. When the electric grinding wheel descends to contact the outer surface of the round tube, the overflow valve can maintain the system pressure stability and ensure that the grinding pressure applied by the electric grinding wheel to the outer surface of the round tube is constant. The grinding pressure can be flexibly set according to the material of the round tube (such as carbon steel, stainless steel, alloy steel, etc.) and the grinding requirements (such as rust removal, rough polishing, fine polishing, etc.).

[0038] The electric grinding wheel 302 uses a resin-bonded diamond grinding wheel, and the grit size can be selected according to the grinding precision requirements, which can effectively improve grinding efficiency. In addition, the drive motor of the electric grinding wheel 302 has a rated power of 3kW and a rated speed of 2800r / min. It has an overload protection function and can automatically stop the machine when it encounters a hard object during grinding to avoid equipment damage.

[0039] The pipe support mechanism 4 is located on both sides of the grinding mechanism, symmetrically distributed at the left and right ends of the hydraulic lifting grinding mechanism 3. The distance between each set of pipe support mechanisms 4 and the grinding mechanism is set to 500mm. This distance ensures effective support for the grinding area of ​​the round pipe while avoiding interference between the support mechanism and the grinding mechanism. Each set of pipe support mechanisms 4 includes two sets of oppositely arranged auxiliary hydraulic components 401. The auxiliary hydraulic components 401 are vertically fixed on the crossbeam of the frame 1. The two sets of auxiliary hydraulic components 401 are located above and below the round pipe, respectively, forming a clamp-type support structure. The lower end of the auxiliary hydraulic component 401 located above is the output end, and the upper end of the auxiliary hydraulic component 401 located below is the output end. The two output ends are respectively connected to the roller frame 402 by bolts. The auxiliary hydraulic components 401 can drive the roller frame 402 to achieve lifting and adjustment, thereby adjusting the contact position between the positioning roller 403 and the round pipe.

[0040] like Figure 1 As shown, the output ends of the two sets of oppositely arranged auxiliary hydraulic components are connected to the positioning roller 403 through the roller frame 402. The positioning roller 403 is rotatably mounted on the roller frame 402 through bearings. The auxiliary hydraulic component 401 drives the entire roller frame 402 to rise and fall, thereby quickly adjusting the height of the positioning roller 403 to adapt to round pipes of different diameters and always provide stable support.

[0041] In this embodiment, the round tube can move between two sets of positioning rollers 403 on each set of tube support mechanisms. After adjustment, the distance between the positioning rollers 403 on the two sets of oppositely arranged auxiliary hydraulic components is adjustable, thus adapting to the grinding of round tubes of different diameters. Specifically, when grinding large-diameter round tubes, the upper auxiliary hydraulic component drives the roller frame 402 to move upward, and the lower auxiliary hydraulic component 401 drives the roller frame 402 to move downward, increasing the distance between the positioning rollers. When processing small-diameter round tubes, the upper auxiliary hydraulic component 401 drives the roller frame 402 to move downward, and the lower auxiliary hydraulic component 401 drives the roller frame 402 to move upward, reducing the distance between the positioning rollers 403, ensuring that the positioning rollers 403 are in close contact with the outer surface of the round tube, and achieving reliable support.

[0042] like Figure 4 As shown, the roller frame is U-shaped and made of extruded aluminum alloy, making it lightweight and rigid. The end of the roller frame away from the circular tube is mounted on the output end of the auxiliary hydraulic component 401 via a flange, and the positioning roller is mounted on the open end of the roller frame. At least two positioning rollers are installed on each roller frame 402 (two in this embodiment), and the two positioning rollers 403 are arranged parallel to each other along the axial direction of the circular tube. This double roller design can further improve the support stability of the circular tube and prevent the circular tube from deflecting during axial movement.

[0043] The surface of the positioning roller is covered with polyurethane material, which has excellent elasticity and wear resistance, and a Shore hardness of 85A. This material can increase the friction with the outer surface of the round tube, preventing the round tube from slipping, and also avoid scratching the outer surface of the round tube. It is especially suitable for grinding stainless steel round tubes with high surface quality requirements.

[0044] like Figure 2 As shown, when the electric clamp 5 moves the round tube past the pipe support mechanism 4 on the right side of the hydraulic lifting grinding mechanism 3, the positioning rollers on the upper and lower sets of roller frames on the pipe support mechanism 4 on the right side of the hydraulic lifting grinding mechanism 3 provide limiting support for the round tube. Through the tight fit between the positioning rollers and the outer surface of the round tube, the radial displacement of the round tube is restricted, so that the round tube always remains coaxial with the electric clamp 5. As the grinding work continues, the round tube moves laterally to the left under the drive of the transverse drive mechanism 2. When the grinding area of ​​the round tube enters the working range of the hydraulic lifting grinding mechanism 3, the pipe support mechanism 4 on the left side of the hydraulic lifting grinding mechanism 3 also provides limiting support for the other end of the round tube. At this time, the electric grinding wheel 302 of the hydraulic lifting grinding mechanism 3 grinds the round tube between the two pipe support mechanisms 4. Because the two sets of pipe support mechanisms 4 effectively support both ends of the round pipe, a stable two-point support structure is formed, so that the round pipe will not bend or deform due to its own weight or grinding pressure during the grinding process, ensuring that the grinding work can be carried out stably and smoothly.

[0045] Two sets of pipe support mechanisms 4 are symmetrically arranged, each set of pipe support mechanisms 4 having two sets of auxiliary hydraulic components 401 and roller frames 402 symmetrically arranged. This symmetrical design ensures the stability and centering of the circular pipe during rotation and movement. In addition, the auxiliary hydraulic components 401 of the pipe support mechanism 4 share a hydraulic station with the main hydraulic component 301, and are individually controlled by electromagnetic directional valves. This simplifies the overall structure of the device, reduces equipment costs, and also facilitates unified parameter adjustment by operators.

[0046] This embodiment also includes a collection box 7, which is used to collect metal shavings and dust generated during the grinding process, preventing the shavings and dust from spreading into the working environment and endangering the health of operators. It also facilitates subsequent shavings recycling and processing. The collection box 7 is made of stainless steel and has the advantages of corrosion resistance and high strength. Its volume is 500L, which can meet the shavings collection needs of long-term continuous grinding.

[0047] The collection box 7 is equipped with a chip hopper 6, which has a conical structure and is made of the same material as the collection box 7. The chip hopper 6 is fixedly installed on the top of the collection box 7 by bolts and is connected to the top of the collection box 7. The position of the chip hopper 6 corresponds to the position of the grinding mechanism, specifically located directly below the electric grinding wheel 302. The conical structure of the chip hopper 6 has a good guiding effect, which can quickly collect the grinding debris and dust and guide it into the collection box 7.

[0048] Preferably, the chip collection hopper 6 has an upper diameter of 800 mm, a lower diameter of 200 mm, and a height of 500 mm. Its inner wall is polished, with a surface roughness Ra≤0.8μm, which reduces the adhesion of chips and dust to the inner wall of the chip collection hopper.

[0049] To further enhance the dustproof effect, a flexible dustproof curtain is installed on the upper edge of the chip collection hopper 6. The dustproof curtain is made of PVC material, with a thickness of 0.5mm and a length of 300mm. When the round tube passes through the top of the chip collection hopper, the dustproof curtain can fit against the outer surface of the round tube to form a closed collection space, effectively preventing the dust generated during the grinding process from spreading out from the upper opening of the chip collection hopper.

[0050] The collection box 7 is equipped with omnidirectional casters at each of its four bottom corners. These casters are equipped with braking devices, allowing operators to move the collection box 7 by pushing it to a designated location for debris disposal. Once the collection box 7 is in the target location, the braking devices can be used to lock the casters and prevent further movement. Additionally, the collection box 7 has an observation window on its side, made of transparent acrylic material. This allows operators to monitor the debris accumulation inside the collection box in real time for timely cleaning.

[0051] The polishing device in this embodiment has the following effects: High degree of automation and high efficiency: The automatic rotation and axial feeding of the round tube are achieved through the horizontal drive mechanism and drive motor. Combined with the automatic lifting grinding unit, the grinding of the outer surface of the round tube is fully automated. One person can operate multiple machines, and the production efficiency is significantly improved.

[0052] Excellent grinding quality: The constant rotation speed and smooth axial movement, combined with the stable grinding pressure controlled by the hydraulic system, ensure the uniformity and consistency of grinding on the outer surface of the round tube, avoiding the problem of uneven grinding depth caused by manual grinding.

[0053] Excellent adaptability: With its hydraulically lifted support mechanism and horizontally movable drive mechanism, this device can be quickly adjusted to accommodate round pipes of different lengths and diameters, offering high versatility. The conical top fixture design further enhances its adaptability to different pipe diameters.

[0054] Stable and reliable operation: Utilizing a ball screw linear module 201 and a hydraulic system, the movement is smooth and the control is precise. The dustproof design extends the service life of core components. The symmetrically arranged support mechanism ensures rigidity during processing and reduces vibration.

[0055] Example 2 In a typical embodiment of the present invention, reference is made to Figures 1-4 As shown, a method for polishing the outer surface of a circular tube, using the polishing apparatus described in Embodiment 1, includes the following steps: One end of the round tube to be ground is inserted into the electric round tube clamp 5 and fixed. The spacing of the positioning rollers is adjusted according to the diameter of the round tube to ensure that the round tube can be stably supported. The electric grinding wheel of the grinding mechanism descends and contacts the outer surface of the round tube. The preset grinding pressure is set, and the horizontal drive mechanism and drive motor are started to realize the horizontal movement of the round tube while it rotates. During the process, the electric grinding wheel continuously grinds the outer surface of the round tube.

[0056] Specifically, Step 1: Loading and clamping; After connecting the hydraulic components to the hydraulic pump body and powering on the motor for debugging, the operator inserts one end of the round tube to be ground into the round tube electric clamp 5. The conical top 8 is pushed into the inner hole of the end of the round tube by the drive unit 2, realizing automatic centering and clamping. The other end of the round tube is placed freely on the positioning rollers 403 of the tube support units 4 on both sides. Step 2: Adjust the support height; Based on the diameter of the round tube, the auxiliary hydraulic components 401 of the tube support units 4 on both sides are controlled to move, driving the positioning rollers 403 to rise and fall until the axis of the round tube is at the same height as the axis of the drive unit 2, and ensuring that the round tube is stably supported. Step 3: Set the polishing parameters; Start the main hydraulic assembly 301 to drive the electric grinding wheel 302 to descend, so that it contacts the upper surface of the round tube and applies a preset grinding pressure; Step 4: Start automatic polishing; Simultaneously, the drive motor 203 and the ball screw linear module 201 are started. The drive motor 203 drives the round tube to rotate at a constant speed, while the ball screw linear module 201 drives the entire drive unit 2 and the round tube to move at a constant speed along its axis. During this process, the high-speed rotating electric grinding wheel 302 performs continuous, spiral grinding on the outer surface of the round tube. Step 5: Unloading; Once the round tube has been polished, the drive unit 2 stops and resets, the electric clamp 5 for the round tube is released, and the operator can remove the polished round tube. The polishing debris falls into the chip hopper 6 and is eventually collected in the collection box 7.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A grinding device for the outer surface of a circular tube, characterized in that, include: frame; A transverse drive mechanism, mounted on a frame, includes a linear module. The output end of the linear module is connected to a drive motor. The drive motor is rotatably connected to a round tube electric clamp. The round tube electric clamp is used to clamp the end of the round tube. The drive motor drives the round tube to move laterally and rotate through the round tube electric clamp. The grinding mechanism, mounted on the frame, includes a liftable electric grinding wheel for grinding the outer surface of the round tube; The pipe support mechanism is located on the frame and close to the grinding mechanism. The pipe support mechanism is equipped with a liftable positioning roller to limit the round pipe during grinding.

2. The grinding device for the outer surface of a circular tube according to claim 1, characterized in that, The lateral drive mechanism includes a ball screw linear module, with a drive plate at its output end. A drive motor is mounted on the drive plate, and the drive plate drives the drive motor to move laterally.

3. The grinding device for the outer surface of a circular tube according to claim 2, characterized in that, The circular tube electric clamp is rotatably connected to the housing of the drive motor via bearings, and the output end of the drive motor is connected to the circular tube electric clamp.

4. The grinding device for the outer surface of a circular tube according to claim 2, characterized in that, The electric clamp for the circular tube is provided with a conical top at the middle position, which is inserted into the inside of the circular tube to achieve positioning.

5. The grinding device for the outer surface of a circular tube according to claim 1, characterized in that, The grinding mechanism is a hydraulic lifting grinding mechanism, which includes a main hydraulic component and an electric grinding wheel located at the output end of the main hydraulic component to achieve lifting.

6. The grinding device for the outer surface of a circular tube according to claim 5, characterized in that, The pipe support mechanism is located on both sides of the grinding mechanism. Each set of pipe support mechanisms includes two sets of oppositely arranged auxiliary hydraulic components. The output end of the auxiliary hydraulic components is connected to the positioning roller through the roller frame. The round pipe can move between the two sets of positioning rollers on each set of pipe support mechanisms. The distance between the positioning rollers on the two sets of oppositely arranged auxiliary hydraulic components is adjustable.

7. The grinding device for the outer surface of a circular tube according to claim 6, characterized in that, The roller frame is U-shaped, and positioning rollers are installed on the roller frame. At least two positioning rollers are installed on each roller frame.

8. The grinding device for the outer surface of a circular tube according to claim 1, characterized in that, It also includes a collection box, which is equipped with a chip collection hopper. The chip collection hopper is positioned corresponding to the position of the grinding mechanism and is used to collect grinding debris and dust.

9. A grinding device for the outer surface of a circular tube according to claim 8, characterized in that, The collection box is equipped with wheels at the bottom.

10. A method for grinding the outer surface of a circular tube, characterized in that, The polishing apparatus as described in any one of claims 1-9 comprises the following steps: Insert one end of the round tube to be ground into the electric round tube clamp and fix it. Adjust the spacing of the relatively set positioning rollers according to the diameter of the round tube to ensure that the round tube can be stably supported. The electric grinding wheel of the grinding mechanism descends and contacts the outer surface of the round tube. The preset grinding pressure is then activated, and the horizontal drive mechanism and drive motor are started, so that the round tube can move laterally and rotate at the same time. During the process, the electric grinding wheel continuously grinds the outer surface of the round tube.

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