Metal polishing apparatus

Abstract

The present application relates to the technical field of metal pipe inner cylindrical surface grinding and polishing and intelligent manufacturing equipment industry, in particular to a metal polishing equipment, which comprises a workbench, a conveyor installed on the top of the workbench and a guide cover fixed on the output end of the conveyor, and a plurality of round pipe workpieces are carried on the roller way of the conveyor, the present application realizes the automatic alignment of the weld on the inner wall of the round pipe through the locating assembly, and then realizes the 90 degree posture switching of the polishing wheel through the polishing switching assembly composed of a rotating seat, a rotating shaft, a limiting gear, a limiting rack and a cylinder, so as to complete the grading processing of the weld fixed-point grinding and the whole inner wall whole-circle grinding, the grading processing mode can relieve the periodic impact of the weld scar projection on the polishing wheel, slow down the local wear rate of the grinding material, improve the overall processing uniformity of the pipe inner cylindrical surface, and provide a feasible structural support for the high-precision upgrading of the pipe grinding equipment in the intelligent manufacturing equipment industry.

Description

Technical Field

[0001] This invention relates to the field of grinding and polishing of the inner cylindrical surface of metal pipes and intelligent manufacturing equipment, specifically a metal grinding and polishing device. Background Technology

[0002] Grinding and polishing the inner walls of metal pipes falls under the category of precision machining of rotating surfaces. It is a core step in metal surface treatment and a significant development direction for pipe post-processing equipment in the intelligent manufacturing equipment industry. Existing metal grinding and polishing equipment for round pipe workpieces typically consists of a workpiece rotation roller mechanism, an axial feed module, a lifting and adjusting grinding head assembly, and a drive control unit. It relies on the circumferential rotation of the workpiece and the axial feed of the grinding head to achieve the overall grinding and polishing of the cylindrical surface inside the pipe. With the technological iteration of the intelligent manufacturing equipment industry, such equipment has gradually achieved basic automated processing and can adapt to the grinding needs of rotating surfaces of straight pipe workpieces of different diameters. However, its core function remains general-purpose uniform grinding of the entire inner wall, with relatively insufficient specialized structural designs for treating localized protrusions such as weld seams.

[0003] Existing metal grinding and polishing equipment generally does not perform separate pre-grinding of the inner weld seam when processing round pipe workpieces with welds, and directly performs full-circumference inner wall grinding operations, which easily leads to a series of processing defects. Because the weld scars on the inner wall have obvious local protrusions, the grinding wheel is subjected to periodic impact loads during grinding, causing accelerated local wear of grinding consumables and shortening their service life. At the same time, over-grinding depressions or incomplete removal of excess weld material are prone to occur at the weld seam, resulting in uneven overall surface quality of the pipe inner wall, making it difficult to meet the processing standards of high-precision pipe fittings. Furthermore, existing equipment lacks an integrated design for automatic weld seam positioning and graded grinding, making it unable to adapt to the differentiated processing needs of rotating surfaces, which also restricts the upgrading and development of pipe grinding equipment towards higher precision and greater adaptability in the intelligent manufacturing equipment industry. Summary of the Invention

[0004] The purpose of this invention is to provide a metal grinding and polishing device to solve the problems mentioned in the background art. Existing grinding devices for round pipes with welded seams generally do not perform separate pre-grinding of the inner wall weld seam, but directly carry out the whole circumference inner wall grinding operation. The local protrusion of the weld scar can easily cause periodic impact on the grinding wheel, aggravate the local wear of consumables, shorten the service life, and also easily cause over-grinding depressions or residual height at the weld seam, resulting in uneven inner wall surface quality. Furthermore, the lack of integrated design for weld seam positioning and graded grinding makes it difficult to adapt to the different rotary surface processing needs, thus restricting the upgrading and development of pipe grinding equipment in the intelligent manufacturing equipment industry.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metal grinding and polishing equipment, comprising a worktable, a conveyor mounted on the top of the worktable, and a guide cover fixed to the output end of the conveyor. Several round tube workpieces are carried on the roller conveyor. A base is fixed to the bottom of the worktable. A mounting frame is fixed to the top of the conveyor near the guide cover. Two drive rollers are symmetrically arranged at the bottom of the mounting frame. A rotating frame is arranged between the tops of the two drive rollers. A drive discharge assembly is arranged at the top of the mounting frame. A support frame is arranged at the top of the guide cover. A first electric telescopic rod is arranged laterally at the top of the support frame. A fixing block is fixed to the outside of the first electric telescopic rod near the output end of the two drive rollers. A polishing wheel is arranged at the bottom of the fixing block. A grinding switching assembly is arranged at the top of the fixing block. A positioning assembly is arranged between the fixing block and the polishing wheel.

[0006] Furthermore, the rotating frame is internally equipped with several auxiliary rollers, and a second electric telescopic rod is fixed to the outside of the mounting frame on the side near the rotating frame. The output end of the second electric telescopic rod is fixedly connected to the top center of the rotating frame, and a control box is fixed to the bottom of the workbench.

[0007] Furthermore, each of the drive rollers is provided with a limit frame on its exterior. Both ends of the drive roller are rotatably mounted through and on the two side walls of the limit frame. A drive control motor is fixedly mounted on the exterior of one side of the limit frame, and the output end of the drive control motor is coaxially and fixedly connected to one end of the drive roller.

[0008] Furthermore, a fine-tuning electric telescopic rod is vertically fixed to the top of the support frame, and a guide rod is vertically slidably inserted through the support frame on the side near the fine-tuning electric telescopic rod. The output end of the fine-tuning electric telescopic rod and the top end of the guide rod are both fixedly connected to the bottom end of the first electric telescopic rod.

[0009] Furthermore, a grinding frame is provided at the bottom of the fixed block, the polishing wheel is rotatably installed inside the grinding frame, a drive motor is fixedly installed on one side of the grinding frame, and the output end of the drive motor is fixedly connected to the middle of the polishing wheel.

[0010] Furthermore, the grinding switching assembly includes a rotating seat and a cylinder. The rotating seat passes through and is rotatably clamped inside one end of the fixed block. The cylinder is fixedly installed on the outside of the top end of the fixed block. A rotating shaft is fixedly installed at the middle of the top end of the rotating seat. A limit gear is fixedly sleeved on the top end of the rotating shaft. A limit rack is fixedly installed at the output end of the cylinder. The limit rack is meshed with the limit gear.

[0011] Furthermore, a positioning frame is fixed at the top center of the fixed block, and a pressure control switch is fixed at one end of the positioning frame near the rotating seat; the positioning assembly includes several limiting rods and abutting blocks, the several limiting rods are arranged around the rotating seat and slide through the rotating seat, and the abutting block is fixedly installed at the top of one of the limiting rods near the pressure control switch.

[0012] Furthermore, the bottom ends of the limiting rods are all fixedly installed on the outside of the top of the grinding frame, and a compression spring is sleeved on the outside of each limiting rod. The two ends of the compression spring are respectively fixedly installed on the outside of one side of the grinding frame and the outside of one side of the rotating seat.

[0013] Furthermore, the drive feeding assembly includes a stepper motor, a drive rod, and two connecting rods. The stepper motor is fixedly installed at the top center of the mounting frame, the middle part of the drive rod is fixedly installed at the top of the stepper motor output end, and one end of each of the two connecting rods is rotatably installed outside the two ends of the drive rod.

[0014] Furthermore, a connecting frame is vertically fixed to the top of each limiting frame, and an auxiliary rod is horizontally fixed to the outside of the mounting frame on the side near the connecting frame. One end of the auxiliary rod is slidably mounted on the outside of the connecting frame on the side away from the mounting frame, and the top of the connecting frame is rotatably connected to the end of the corresponding connecting rod away from the drive rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This equipment uses a positioning assembly consisting of a limit rod, abutment block, compression spring, and pressure control switch to achieve automatic positioning and alignment of the weld seam on the inner wall of the circular pipe, relying on the floating structure of the grinding head itself. Then, a grinding switching assembly consisting of a rotating seat, rotating shaft, limit gear, limit rack, and cylinder achieves 90° attitude switching of the polishing wheel, completing the graded processing of weld seam fixed-point grinding and full circumferential grinding of the inner wall. This graded processing mode can alleviate the periodic impact of weld scar protrusion on the polishing wheel, reduce the local wear rate of grinding consumables, and improve the overall processing uniformity of the cylindrical surface inside the pipe, providing feasible structural support for the high-precision upgrade of pipe grinding equipment in the intelligent manufacturing equipment industry.

[0017] 2. This equipment, through a drive and discharge assembly consisting of a stepper motor, drive rod, and connecting rod, combined with a guide support structure of connecting frame and auxiliary rod, can synchronously drive two sets of limit frames and drive rollers to open and close. Automatic unloading of the processed round tubes is achieved by varying the roller spacing. Combined with the conveying and guiding functions of the front-end conveyor and guide hood, a fully automated operation chain of loading, processing, and unloading is formed. This reduces the frequency of manual loading and unloading operations, improves the production efficiency and operational consistency of grinding and polishing the inner cylindrical surface of the round tube, and ensures smooth and controllable unloading, reducing the risk of collision damage during workpiece unloading and guaranteeing the quality of the finished product on the rotating surface of the tube. It is well-suited to the continuous and batch operation development needs of tube processing equipment in the intelligent manufacturing equipment industry. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the mounting bracket and stepper motor of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the support frame and the first electric telescopic rod of the present invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0022] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B;

[0023] Figure 6 This is a three-dimensional structural diagram of the first electric telescopic rod and the fine-tuning electric telescopic rod of the present invention;

[0024] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C;

[0025] Figure 8 This is a partial cross-sectional perspective view of the three-dimensional structure of the fixing block and rotating seat of the present invention;

[0026] Figure 9 This is a schematic diagram illustrating how the invention uses a drive roller to rotate a circular tube to position the weld seam.

[0027] Figure 10 This is a schematic diagram of the polishing wheel of the present invention grinding and polishing the inner wall of a circular tube;

[0028] Figure 11 This is a three-dimensional structural diagram of the connecting frame and auxiliary rod of the present invention;

[0029] Figure 12This is a top view of the drive rod and connecting rod of the present invention.

[0030] In the attached diagram, the components represented by each number are as follows: 1. Workbench; 2. Conveyor; 3. Guide shroud; 4. Mounting frame; 5. Drive roller; 6. Support frame; 7. First electric telescopic rod; 8. Polishing wheel; 9. Grinding frame; 10. Fixing block; 11. Fine-tuning electric telescopic rod; 12. Guide rod; 13. Limiting frame; 14. Second electric telescopic rod; 15. Rotating frame; 16. Auxiliary roller; 17. Control box; 18. Rotating seat; 19. Limiting rod; 20. Positioning frame; 21. Pressure control switch; 22. Contact block; 23. Compression spring; 24. Rotating shaft; 25. Limiting gear; 26. Cylinder; 27. Limiting rack; 28. Drive motor; 29. ​​Stepper motor; 30. Drive rod; 31. Connecting rod; 32. Connecting frame; 33. Auxiliary rod; 34. Drive control motor; 35. Base. Detailed Implementation

[0031] 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.

[0032] Example 1: Please refer to Figure 1 - Figure 4 A metal grinding and polishing device includes a worktable 1, a conveyor 2 mounted on the top of the worktable 1, and a guide cover 3 fixed to the output end of the conveyor 2. Several round tube workpieces are carried on the roller conveyor of the conveyor 2. A base 35 is fixed to the bottom end of the worktable 1. A mounting frame 4 is fixed to the top of the conveyor 2 near the guide cover 3. Two drive rollers 5 are symmetrically arranged at the bottom end of the mounting frame 4. A rotating frame 15 is arranged between the top ends of the two drive rollers 5. A support frame 6 is arranged at the top of the guide cover 3. A first electric telescopic rod 7 is arranged laterally at the top of the support frame 6. A fixing block 10 is fixed to the outside of the first electric telescopic rod 7 near the output end of the two drive rollers 5. A polishing wheel 8 is arranged at the bottom end of the fixing block 10. A grinding switching component is arranged at the top end of the fixing block 10. A positioning component is arranged between the fixing block 10 and the polishing wheel 8.

[0033] The rotating frame 15 has several auxiliary rollers 16 installed inside. The mounting frame 4 is fixed to the outside of the rotating frame 15 on one side. The output end of the second electric telescopic rod 14 is fixedly connected to the top center of the rotating frame 15. The bottom of the workbench 1 is fixed with a control box 17.

[0034] Each drive roller 5 is provided with a limit frame 13 on its outside. Both ends of the drive roller 5 are mounted through and rotatably on the two side walls of the limit frame 13. A drive control motor 34 is fixedly installed on the outside of one side of the limit frame 13. The output end of the drive control motor 34 is coaxially fixedly connected to one end of the drive roller 5.

[0035] A fine-tuning electric telescopic rod 11 is vertically fixed at the top of the support frame 6. A guide rod 12 is vertically slidably inserted on the side of the support frame 6 near the fine-tuning electric telescopic rod 11. The output end of the fine-tuning electric telescopic rod 11 and the top end of the guide rod 12 are both fixedly connected to the bottom end of the first electric telescopic rod 7.

[0036] A grinding frame 9 is provided at the bottom of the fixed block 10. The polishing wheel 8 is rotatably installed inside the grinding frame 9. A drive motor 28 is fixedly installed on one side of the grinding frame 9. The output end of the drive motor 28 is fixedly connected to the middle of the polishing wheel 8.

[0037] The grinding switching assembly includes a rotating seat 18 and a cylinder 26. The rotating seat 18 is inserted through and rotatably clamped inside one end of the fixed block 10. The cylinder 26 is fixedly installed on the outside of the top end of the fixed block 10. A rotating shaft 24 is fixedly installed in the middle of the top end of the rotating seat 18. A limit gear 25 is fixedly sleeved on the top end of the rotating shaft 24. A limit rack 27 is fixedly installed at the output end of the cylinder 26. The limit rack 27 and the limit gear 25 are meshed and connected.

[0038] A positioning frame 20 is fixed at the top center of the fixed block 10, and a pressure control switch 21 is fixed at one end of the positioning frame 20 near the rotating seat 18. The positioning component includes several limiting rods 19 and abutting blocks 22. The several limiting rods 19 are arranged around the rotating seat 18 and slide through the rotating seat 18. The abutting block 22 is fixedly installed at the top of one of the limiting rods 19 near the pressure control switch 21.

[0039] The bottom ends of the limiting rods 19 are all fixedly installed on the outside of the top of the grinding frame 9. Each limiting rod 19 is fitted with a compression spring 23. The two ends of the compression spring 23 are respectively fixedly installed on the outside of one side of the grinding frame 9 and the outside of one side of the rotating seat 18.

[0040] In this embodiment, the working principle of the metal grinding and polishing equipment is as follows: it performs graded grinding and polishing on the inner cylindrical surface of the round tube, which meets the process requirements of precision machining of rotating surfaces and is also compatible with the automation upgrade direction of pipe fitting post-processing equipment in the intelligent manufacturing equipment industry.

[0041] The workbench 1 and the base 35 at the bottom provide stable installation support for the entire machine. The existing conveyor 2 transports the round tube workpieces to be processed one by one to the processing station. After being guided and limited by the guide cover 3, the round tubes enter the area above the two drive rollers 5. The mounting frame 4 is fixed to the top of the conveyor 2 near the guide cover 3, providing a stable installation foundation for the drive rollers 5, the rotating frame 15, and the drive discharge assembly. When the control box 17 detects that the round tube has arrived at the processing station, it controls the conveyor 2 to stop conveying, completing the workpiece loading and positioning.

[0042] After the material is loaded, the second electric telescopic rod 14 is started, which drives the rotating frame 15 to move downward, so that several auxiliary rollers 16 inside the rotating frame 15 abut against the outer wall of the top of the round tube; the auxiliary rollers 16 cooperate with the two drive rollers 5 below to form a radial limit on the round tube, which can reduce the radial runout during the rotation of the round tube and ensure the stability of the subsequent positioning and grinding process.

[0043] During the weld seam positioning stage, the radial height of the grinding head is first adjusted: the fine-tuning electric telescopic rod 11, which is vertically fixed to the top of the support frame 6, is activated, driving the first electric telescopic rod 7 to move vertically. The guide rod 12 slides vertically along the support frame 6, providing linear guidance for the lifting and lowering of the first electric telescopic rod 7, avoiding radial sway during movement, and ensuring the accuracy of height adjustment. By adjusting the height of the fine-tuning electric telescopic rod 11, the bottom of the polishing wheel 8 is brought close to the inner wall of the bottom of the round tube. With the pre-compression of the compression spring 23, a stable initial contact pressure is provided, allowing the polishing wheel 8 to adhere to the inner wall of the bottom of the round tube with a stable initial contact pressure, providing a consistent detection benchmark for subsequent weld seam positioning.

[0044] The support frame 6 provides an installation carrier for the grinding head feeding and lifting structure. After the height adjustment is completed, the drive control motor 34 starts, and the drive roller 5 supported by the limit frame 13 drives the round tube to rotate circumferentially at a low speed. When the weld protrusion on the inner wall of the round tube rotates to the contact position of the polishing wheel 8, the local protrusion of the weld scar pushes the polishing wheel 8 upward, causing the grinding frame 9 and the limit rod 19 to slide upward against the elastic force of the compression spring 23. The abutment block 22 fixed to the top of one of the limit rods 19 moves upward synchronously. When the sliding stroke reaches the preset threshold, the abutment block 22 abuts against the pressure control switch 21 installed on the positioning frame 20, and the pressure control switch 21 outputs a trigger signal to the control box 17. The control box 17 incorporates existing positioning latching control logic: the positioning process only responds to the first pressure trigger signal of the pressure control switch 21. When the contact block 22 first presses against the pressure control switch 21, the controller determines that the weld is in place and then controls the drive control motor 34 to decelerate and stop, so that the weld and polishing wheel 8 are circumferentially aligned. In the remaining processes of this processing cycle, subsequent state changes of the pressure control switch 21 do not participate in the start and stop control of the drive roller 5 until the entire round tube is polished and the equipment is reset, at which point the positioning logic can be reactivated. Combined with the floating buffer of the compression spring 23 and the subsequent attitude switching structure, the erroneous start and stop of the roller caused by the floating of the grinding head during the polishing process can be effectively avoided, ensuring the stability of equipment operation, thus completing the automatic positioning of the inner wall weld.

[0045] After positioning is completed, the weld pre-grinding process begins. The drive motor 28 starts, causing the polishing wheel 8 inside the grinding frame 9 to rotate at high speed. Simultaneously, the first electric telescopic rod 7 starts, driving the fixed block 10, rotating seat 18, grinding frame 9, and polishing wheel 8 to feed along the axial direction of the circular tube, grinding the entire axial weld. After feeding to the set stroke, the first electric telescopic rod 7 drives the polishing wheel 8 to retract in the opposite direction, thus forming axial reciprocating grinding to gradually remove the weld excess height. During the grinding process, the compression spring 23 provides continuous floating buffer force, adaptively compensating for the gradual change in weld scar height, maintaining a relatively stable grinding contact pressure, which helps to improve the grinding uniformity of the weld area. By pre-grinding the weld separately, this graded processing mode can alleviate the periodic impact of weld scar protrusion on the polishing wheel 8 during subsequent full-circumference grinding, reduce the local wear rate of grinding consumables, and extend the service life of consumables.

[0046] After the pre-grinding of the weld seam is completed, the fine-tuning electric telescopic rod 11 is activated, driving the first electric telescopic rod 7 and the grinding head to move slightly upward, so that the polishing wheel 8 is disengaged from the inner wall of the round tube, avoiding scratching the tube wall material during the posture switching process; then the cylinder 26 is activated, and its output end drives the limiting rack 27 to move linearly, which drives the limiting gear 25 and the rotating shaft 24 to rotate through gear meshing transmission, thereby driving the rotating seat 18, the grinding frame 9 and the polishing wheel 8 to rotate 90° around the vertical central axis, so that the working end face of the polishing wheel 8 is kept parallel to the cross-section of the round tube, completing the switching of the grinding posture (e.g. Figure 10 (As shown). It adopts a rotary drive method with gear and rack, which has high precision in posture switching and can maintain a stable locked state after entering the position, ensuring the consistency of subsequent full-circle grinding.

[0047] After the posture switch is completed, the fine-tuning electric telescopic rod 11 drives the grinding head to move downwards, causing the polishing wheel 8 to re-adhere to the inner wall of the round tube. The drive motor 28 continues to drive the polishing wheel 8 to rotate at high speed, while the drive control motor 34 starts again, driving the round tube to rotate at a set speed in a uniform circumferential direction through the drive roller 5. This, combined with the first electric telescopic rod 7 driving the polishing wheel 8 to reciprocate along the axial direction of the round tube, achieves uniform grinding and polishing of the entire circumference of the inner cylindrical surface of the round tube. This process relies on the coordination of workpiece rotation and grinding head axial feed to complete the machining of the rotating surface. The process characteristics of grinding the inner cylindrical surface ensure that the overall surface roughness of the inner wall of the pipe is uniform and consistent, meeting the processing requirements of high-precision pipe fittings.

[0048] After the inner wall of the entire round tube is polished, each actuator is reset in sequence: the fine-tuning electric telescopic rod 11 drives the grinding head to move upward and retract to the initial position, the cylinder 26 moves in the opposite direction to drive the polishing wheel 8 to rotate and reset, and the second electric telescopic rod 14 drives the rotating frame 15 and the auxiliary roller 16 to move upward, releasing the limit on the top of the round tube.

[0049] The integrated structure and automated control process of the above-mentioned graded grinding effectively improve the processing quality and efficiency of the inner wall of round pipes with welded seams, expand the equipment's adaptability to the processing needs of different pipe fittings' rotating surfaces, and provide a feasible technical path for the structural optimization and functional upgrading of pipe fitting grinding equipment in the intelligent manufacturing equipment industry.

[0050] Example 2: Please refer to Figure 2 - Figure 9 This embodiment further describes Example 1, and the top of the mounting frame 4 is provided with a drive discharge assembly.

[0051] The drive feeding assembly includes a stepper motor 29, a drive rod 30, and two connecting rods 31. The stepper motor 29 is fixedly installed at the top center of the mounting bracket 4. The middle part of the drive rod 30 is fixedly installed at the top of the output end of the stepper motor 29. One end of each of the two connecting rods 31 is rotatably installed on the outside of the two ends of the drive rod 30.

[0052] The top of each limiting frame 13 is vertically fixed with a connecting frame 32. An auxiliary rod 33 is horizontally fixed on the outside of the mounting frame 4 near the connecting frame 32. One end of the auxiliary rod 33 is slidably mounted on the outside of the connecting frame 32 away from the mounting frame 4. The top of the connecting frame 32 is rotatably connected to the end of the corresponding connecting rod 31 away from the drive rod 30.

[0053] In this embodiment, after the inner wall of the entire round tube is polished and all actuators are reset in sequence, the finished workpiece is discharged. The discharge assembly is started to complete the automatic unloading of the processed round tube. In conjunction with the front-end conveyor 2, the continuous operation of the tube rotation surface processing is realized, which meets the automation and unmanned operation requirements of tube processing equipment in the intelligent manufacturing equipment industry.

[0054] Stepper motor 29 is fixed at the top center of mounting bracket 4. After receiving the material discharge command from control box 17, it starts to run and drives drive rod 30, which is coaxially fixed with its output end, to rotate around its central axis. The two ends of drive rod 30 are rotatably connected to one end of two connecting rods 31, respectively, converting the rotational motion of drive rod 30 into the translational push-pull action of connecting rod 31. A single power source linkage synchronous transmission structure is adopted to ensure that the actions of the two actuators are synchronized, simplify the transmission link, and reduce the probability of equipment failure.

[0055] The connecting frames 32 on both sides are respectively fixed to the top of the two sets of limiting frames 13. An auxiliary rod 33 is horizontally fixed on the side of the mounting frame 4 near the connecting frame 32. The rod body of the auxiliary rod 33 passes through the corresponding side of the connecting frame 32, providing linear guidance and radial support for the lateral movement of the connecting frame 32. It can limit the degree of freedom of movement of the connecting frame 32, avoid swaying and jamming during opening and closing, and ensure the stability and alignment accuracy of the movement of the two sets of limiting frames 13. When the drive rod 30 rotates, the two connecting rods 31 simultaneously push the connecting frames 32 on both sides to slide away from each other along the auxiliary rod 33, thereby driving the two sets of limiting frames 13 and the drive rollers 5 rotatably supported on the limiting frames 13 to open outwards simultaneously, increasing the support distance between the two drive rollers 5 and releasing the support and limitation on the bottom of the round tube.

[0056] The round tube, having lost its bottom support, falls downwards under its own weight. Guided by the inclined surface of the guide cover 3, it is orderly discharged along a preset direction to the receiving station outside the equipment, completing the unloading operation of a single round tube. This openable discharge structure relies on the variation of the roller spacing to achieve unloading, eliminating the need for additional pushing or lifting unloading mechanisms. Its compact structure and smooth discharge action reduce workpiece collision damage during unloading, ensuring the finished product quality of the tube's rotating surface.

[0057] After the material is discharged, the stepper motor 29 receives the instruction from the control box 17 and runs in reverse. Through the drive rod 30 and the connecting rod 31, it pulls the two connecting frames 32 on both sides to slide towards each other along the auxiliary rod 33, thereby driving the two drive rollers 5 to reset to the initial support distance and restore their support capacity for subsequent workpieces to be processed. Then the conveyor 2 starts again and transports the next round tube to be processed to the work position above the two drive rollers 5. The equipment automatically enters the next processing cycle.

[0058] This automatic feeding structure, together with the front-end conveying and positioning, automatic weld seam positioning, and graded grinding and polishing processes, forms a complete automated processing link. It can realize the entire process of grinding and polishing the cylindrical surface inside the round pipe, reduce the frequency of manual loading and unloading operations, improve the production efficiency and operational consistency of pipe fitting rotary surface processing, and provide feasible structural support for the full automation and batch production upgrade of pipe grinding equipment in the intelligent manufacturing equipment industry.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0060] 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 metal grinding and polishing device, comprising a worktable (1), a conveyor (2) mounted on the top of the worktable (1), and a guide cover (3) fixed to the output end of the conveyor (2), characterized in that: The conveyor (2) carries several round tube workpieces on its roller conveyor, and the bottom end of the worktable (1) is fixed with a base (35). The top of the conveyor (2) is fixed with a mounting frame (4) near the guide cover (3). Two drive rollers (5) are symmetrically arranged at the bottom of the mounting frame (4). A rotating frame (15) is arranged between the tops of the two drive rollers (5). A drive discharge assembly is arranged at the top of the mounting frame (4). The top of the guide cover (3) is provided with a support frame (6), and the top of the support frame (6) is provided with a first electric telescopic rod (7) in the horizontal direction. The first electric telescopic rod (7) is fixed with a fixing block (10) near the output end of the two drive rollers (5). The bottom of the fixing block (10) is provided with a polishing wheel (8), and the top of the fixing block (10) is provided with a grinding switching component. A positioning component is provided between the fixing block (10) and the polishing wheel (8).

2. The metal grinding and polishing equipment according to claim 1, characterized in that: The rotating frame (15) has several auxiliary rollers (16) installed inside. The mounting frame (4) is fixed with a second electric telescopic rod (14) on the outside of the side close to the rotating frame (15). The output end of the second electric telescopic rod (14) is fixedly connected to the top center of the rotating frame (15). The bottom end of the workbench (1) is fixed with a control box (17).

3. The metal grinding and polishing equipment according to claim 1, characterized in that: Each of the drive rollers (5) is provided with a limit frame (13) on its outside. Both ends of the drive roller (5) are mounted through and rotatably on the two side walls of the limit frame (13). A drive control motor (34) is fixedly installed on one side of the limit frame (13). The output end of the drive control motor (34) is coaxially fixedly connected to one end of the drive roller (5).

4. The metal grinding and polishing equipment according to claim 1, characterized in that: The top of the support frame (6) is vertically fixed with a fine-tuning electric telescopic rod (11), and a guide rod (12) is vertically slidably passed through the side of the support frame (6) near the fine-tuning electric telescopic rod (11). The output end of the fine-tuning electric telescopic rod (11) and the top end of the guide rod (12) are both fixedly connected to the bottom end of the first electric telescopic rod (7).

5. The metal grinding and polishing equipment according to claim 1, characterized in that: A grinding frame (9) is provided at the bottom of the fixed block (10). The polishing wheel (8) is rotatably installed inside the grinding frame (9). A drive motor (28) is fixedly installed on one side of the grinding frame (9). The output end of the drive motor (28) is fixedly connected to the middle of the polishing wheel (8).

6. The metal grinding and polishing equipment according to claim 5, characterized in that: The grinding switching assembly includes a rotating seat (18) and a cylinder (26). The rotating seat (18) passes through and is rotatably clamped inside one end of the fixed block (10). The cylinder (26) is fixedly installed on the outside of the top of the fixed block (10). A rotating shaft (24) is fixedly installed in the middle of the top of the rotating seat (18). A limiting gear (25) is fixedly sleeved on the top of the rotating shaft (24). A limiting rack (27) is fixedly installed at the output end of the cylinder (26). The limiting rack (27) meshes with the limiting gear (25).

7. The metal grinding and polishing equipment according to claim 6, characterized in that: A positioning frame (20) is fixed at the top center of the fixed block (10), and a pressure control switch (21) is fixed at one end of the positioning frame (20) near the rotating seat (18). The positioning component includes several limiting rods (19) and abutting blocks (22). The several limiting rods (19) are arranged around the rotating seat (18) and slide through the rotating seat (18). The abutting block (22) is fixedly installed at the top of one of the limiting rods (19) near the pressure control switch (21).

8. The metal grinding and polishing equipment according to claim 7, characterized in that: The bottom ends of several limiting rods (19) are fixedly installed on the outside of the top of the grinding frame (9). Each limiting rod (19) is fitted with a compression spring (23). The two ends of the compression spring (23) are fixedly installed on the outside of one side of the grinding frame (9) and the outside of one side of the rotating seat (18).

9. The metal grinding and polishing equipment according to claim 3, characterized in that: The drive feeding assembly includes a stepper motor (29), a drive rod (30) and two connecting rods (31). The stepper motor (29) is fixedly installed at the top center of the mounting bracket (4). The middle part of the drive rod (30) is fixedly installed at the top of the output end of the stepper motor (29). One end of each of the two connecting rods (31) is rotatably installed outside the two ends of the drive rod (30).

10. A metal grinding and polishing equipment according to claim 9, characterized in that: The top of each limiting frame (13) is vertically fixed with a connecting frame (32). The mounting frame (4) is horizontally fixed with an auxiliary rod (33) on the side of the mounting frame (32) near the connecting frame (32). One end of the auxiliary rod (33) is slidably mounted on the side of the connecting frame (32) away from the mounting frame (4). The top of the connecting frame (32) is rotatably connected to the end of the corresponding side connecting rod (31) away from the driving rod (30).

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