Pipe fitting machining device

Abstract

The invention discloses a pipe fitting machining device which comprises a horizontal displacement driving mechanism, a lifting displacement driving mechanism, a clamping mechanism and a bearing assembly, the horizontal displacement driving mechanism is connected with a sliding table capable of moving front and back, a fixed supporting plate is arranged on the front side face of the sliding table, and a driving motor and a shaft seat are installed on the fixed supporting plate; the output end of the driving motor is connected with the driving shaft, the front portion of the driving shaft is sleeved with a supporting rod, the supporting rod is connected with a radial adjustable telescopic polishing assembly, the clamping mechanism is arranged on the front side of the horizontal displacement driving mechanism, and the clamping mechanism is used for clamping a pipe fitting to rotate. The lifting displacement driving mechanism is connected with the bearing assembly and drives the bearing assembly to move up and down, high-quality inner hole machining of pipe fittings of different specifications can be completed, the production preparation time is remarkably shortened, the labor intensity is lowered, and the consistency of finished products and the production efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of grinding equipment, in particular to a pipe processing device. Background Art

[0002] The inner holes of pipe fittings must be polished before leaving the factory, otherwise the remaining burrs, oxide scale and welding spatter will increase fluid resistance, scratch the seals, and even cause premature failure of the entire system.

[0003] However, the industry currently still relies heavily on workers holding extended grinders or simple rotary files to reach into the pipe for operation. This is not only labor-intensive and inefficient, but the grinding force is entirely based on feel, which can easily lead to "over-grinding" or "under-grinding", and the inner wall roughness is extremely unstable. This is because the outer wall grinding equipment has developed relatively maturely, but there are very few professional devices for inner holes. There is a lack of automated solutions that can adapt to different pipe diameters and maintain coaxial positioning, which has become a key bottleneck restricting the improvement of pipe grinding quality and efficiency. Summary of the Invention

[0004] To solve the above technical problems, the present invention relates to a pipe processing device, which has a simple and reliable structure, effectively solves the above technical problems, and is suitable for popularization and use. To achieve the above purpose, the present invention is implemented through the following technical solutions: Base comprises support, castor, and frame upper is provided with guide rail, and support and conveyer frames movable end contact site are provided with recoil spring or rubber cushion, and castor is arranged on the pin of base bottom four, to carry mobile handler location.

[0005] The cam is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel is fixed to the chassis, and the guide wheel

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: the clamping mechanism includes a base, a six-jaw chuck, and a chuck servo motor. A fixed bracket is provided on the base, and a chuck servo motor is installed on the fixed bracket. The output shaft of the chuck servo motor is connected to the six-jaw chuck, and the axial direction of the six-jaw chuck coincides with the axial direction of the drive shaft.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: it also includes a spring, the inner hole of the support rod is slidably matched with the drive shaft, the drive shaft is provided with a first radial protrusion, and the rear end of the support rod is provided with a second radial protrusion, the spring is sleeved on the outside of the drive shaft and is located between the first radial protrusion and the second radial protrusion, the outside of the drive shaft is provided with a radial protrusion, the inner hole of the support rod is provided with a slide groove adapted to the radial protrusion, and the radial protrusion is adapted to the slide groove for axially limiting the support rod to prevent it from detaching from the drive shaft.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the lifting displacement drive mechanism includes a screw motor, a screw, a top plate, a first vertical rod, a second vertical rod, and a lifting plate, the screw is arranged perpendicular to the horizontal plane, the screw motor cooperates with the screw and is used to drive it to rotate, the center hole of the lifting plate is provided with a lifting block that cooperates with the screw thread, the four first vertical rods are symmetrically fixed in pairs around the screw, the top plate is fixed to the top end of the first vertical rod, the lifting plate is provided with four through holes that slide with the first vertical rod, and the lifting plate can move up and down when the screw rotates, the four second vertical rods are symmetrically fixed in pairs above the lifting plate, and the upper part of the second vertical rod is fixedly connected to the lifting support plate after passing through the through hole of the top plate.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: the radially adjustable telescopic grinding assembly includes a sleeve, a scissors-type combination rod, and a mounting plate. The two sleeves are arranged relative to each other front and back and are both sleeved on the outside of the support rod. The sleeve is fixedly connected to the support rod. The outside of each sleeve is provided with three radial protrusions, and the three radial protrusions are evenly spaced around the circumferential direction of the sleeve. The three groups of scissors-type combination rods are also spaced around the circumferential direction. The inner ends of the scissors-type combination rods are respectively rotatably connected to the radial protrusions corresponding to the two sleeves, the outer first end of the scissors-type combination rod is rotatably connected to the positioning plate inside the mounting plate, the outer second end of the scissors-type combination rod cooperates with the slide rail assembly inside the mounting plate, the mounting plate is arranged in an arc shape, and the grinding sanding sheet is arranged on the outside of the mounting plate.

[0010] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0011] Compared with the existing technology, the present invention has the following outstanding and beneficial technical effects: the present invention integrates the originally scattered and inefficient manual grinding process into a continuous and reproducible automated process, and the radially retractable grinding head can be adjusted instantly as the pipe diameter changes; the synchronously rotating six-jaw chuck and the follower support assembly keep the pipe fittings on the same axis at all times, eliminating vibration and eccentricity, and ensuring that the entire inner wall is uniform; the horizontal and lifting drive mechanisms are linked, so that the grinding head always fits the inner hole surface during the advance, retreat and lifting process, avoiding over-grinding, missed grinding or spiral defects that are prone to occur in traditional methods; the whole machine has a compact structure, and the adjustment parameters are uniformly set by the control system. The operator only needs to complete loading and unloading to complete high-quality inner hole processing of pipe fittings of different specifications, significantly shortening production preparation time, reducing labor intensity, and improving finished product consistency and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of the equipment; Figure 2 It is a schematic diagram of the side view of the equipment; Figure 3 Schematic diagram of the radially adjustable telescopic grinding assembly in Example 1; Figure 4 It is a schematic diagram of the radially adjustable telescopic grinding assembly in the second embodiment. DETAILED DESCRIPTION

[0013] In order to make the objectives, technical solutions and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments. However, the specific implementation methods and embodiments described below are only for illustrative purposes and are not intended to limit the present invention.

[0014] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The directions or positional relationships shown are only for the convenience of describing the present invention, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0015] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0016] Example 1 In order to solve the above technical problems, Figure 1-3As shown, in this embodiment, a pipe processing device is designed, including a horizontal displacement drive mechanism 1, a lifting displacement drive mechanism 2, a clamping mechanism 3, and a supporting assembly 4. The horizontal displacement drive mechanism 1 is connected to a slide 11 that can move forward and backward, and a fixed support plate 12 is provided on the front side of the slide 11. A drive motor 13 and an axle seat 14 are installed on the fixed support plate 12. The output end of the drive motor 13 is connected to a drive shaft 15, and the drive shaft 15 passes through the inner hole of the axle seat 14 and rotates with it. The front part of the drive shaft 15 is sleeved with a support rod 16, and the support rod 16 is connected to a radially adjustable telescopic grinding assembly 5. The radially adjustable telescopic grinding assembly 5 is provided with a support rod 16. The grinding assembly 5 includes a grinding sand piece 51, and the axial distance between the grinding sand piece 51 and the support rod 16 can be adjusted. The clamping mechanism 3 is arranged on the front side of the horizontal displacement drive mechanism 1, and the clamping mechanism 3 is used to clamp the pipe fitting for rotation. The lifting displacement drive mechanism 2 is arranged between the clamping mechanism 3 and the horizontal displacement drive mechanism 1. The lifting displacement drive mechanism 2 is connected to the supporting assembly 4 and drives it to move up and down. The supporting assembly 4 includes a lifting support plate 41 and a roller 42. The two rollers 42 are symmetrically arranged on the left and right and are arranged above the lifting support plate 41 through a support block. The central symmetry plane of the two rollers 42 coincides with the axis of the support rod 16.

[0017] Through the above structure, the device realizes the automated and high-precision processing of the inner wall of the pipe. The horizontal displacement drive mechanism 1 drives the slide 11 to move back and forth, so that the grinding sandpaper 51 can penetrate into the interior of the pipe body and feed at a uniform speed along the axial direction, ensuring that the entire inner wall is processed continuously and evenly, avoiding discontinuities and omissions in manual operation. The double rollers 42 in the support assembly 4 are symmetrically arranged to provide stable support for the pipe. At the same time, the clamping mechanism 3 drives the pipe to rotate synchronously, and cooperates with the lifting displacement drive mechanism 2 to adjust the height of the support assembly 4 in real time, so that the axis of the pipe always coincides with the support rod 16, eliminating bending and vibration during long pipe processing, and significantly improving coaxiality and surface consistency. The radially adjustable telescopic grinding assembly 5 can instantly adjust the contact distance between the sandpaper and the pipe wall according to different pipe diameters, greatly shortening the changeover time. Prevent flexural deformation caused by gravity or rotational force, and ensure that the grinding depth and angle are always consistent. The entire device integrates feeding, rotation, support and adjustment functions, realizing the automation and continuous operation of inner hole grinding, significantly improving processing efficiency and product quality, and reducing labor intensity and production costs.

[0018] It is further preferred in this embodiment that the horizontal displacement drive mechanism 1 includes a frame 17, a linear cylinder 18, a guide rod 19, a guide seat 110, a support seat 111, a guide wheel 112, and a guide rail 113. The frame 17 is fixed on the ground, and the support seat 111 is arranged at the rear end above the frame 17. The cylinder body of the linear cylinder 18 is fixed to the rear side of the support seat 111, and the piston rod of the linear cylinder 18 passes through the front baffle of the support seat 111 forward and is fixedly connected to the slide 11. The linear cylinder 18 is only responsible for pure axial thrust and is not movable. The plug rod is coaxial with the center of the slide 11, eliminating lateral bending moment, and the thrust output is linear and responsive. Guide seats 110 are provided on the left and right sides and the upper and lower positions of the support seat 111 respectively. The front and rear ends of the guide rod 19 are fixedly connected to the slide 11 and the rear baffle of the support seat 111 respectively. The guide rod 19 is arranged parallel to the piston rod of the linear cylinder 18. The guide rod 19 passes through the inner hole of the guide seat 110 and slides with it. The four guide rods 19 form a closed rectangular guide frame. The slide 11 is bidirectionally constrained at any position, and the straightness and repeat positioning accuracy are guaranteed. Wheel seats 114 are symmetrically provided on the left and right sides of the lower side of the slide 11, and each wheel seat 114 is connected to a guide wheel 112. The upper surface of the frame 17 is provided with left and right symmetrical guide rails 113. The guide wheels 112 cooperate with the guide rails 113 and can roll back and forth along the direction of the guide rails 113. The weight of the slide 11 and the grinding reaction force are borne by the rolling pair of the guide wheel 112 and the guide rail 113, and sliding is changed to rolling, the friction resistance is greatly reduced, the temperature rise is low and the wear is small during long-term operation, and at the same time, the lateral limitation of the guide wheel 112 by the guide rail 113 further suppresses the yaw, so that the entire slide 11 always maintains a smooth and low-noise reciprocating motion within a long stroke.

[0019] It is further preferred in this embodiment that the clamping mechanism 3 includes a base 31, a six-jaw chuck 32, and a chuck servo motor 33. A fixed bracket is provided on the base 31, and a chuck servo motor 33 is installed on the fixed bracket. The output shaft of the chuck servo motor 33 is connected to the six-jaw chuck 32, and the axial direction of the six-jaw chuck 32 coincides with the axial direction of the drive shaft 15. The clamping mechanism 3 uses the base 31 as a rigid reference and directly drives the six-jaw chuck 32 through the chuck servo motor to achieve high-speed and smooth rotation of the pipe fitting. The six-jaw synchronous clamping can automatically center the pipe fitting to ensure that the pipe fitting is coaxial with the drive shaft 15 to avoid eccentric vibration.

[0020] It is further preferred that the present embodiment further includes a spring 115, the inner hole of the support rod 16 is slidably matched with the drive shaft 15, the drive shaft 15 is provided with a first radial convex disc 116, and the rear end of the support rod 16 is provided with a second radial convex disc 117, the spring 115 is sleeved on the outside of the drive shaft 15 and is located between the first radial convex disc 116 and the second radial convex disc 117, forming a flexible floating connection between the drive shaft 15 and the support rod 16, when the grinding sheet 51 encounters a sudden radial step of the pipe or weld, the spring 115 15 can be compressed or rebounded instantly and the grinding pressure can be automatically adjusted. A radial protrusion is provided on the outer side of the driving shaft 15, and a slide groove is provided in the inner hole of the supporting rod 16 to match the radial protrusion. The radial protrusion and the slide groove are adapted to axially limit the supporting rod 16 to prevent it from separating from the driving shaft 15. The cooperation between the radial protrusion and the slide groove provides a clear axial limit while transmitting torque, ensuring that the supporting rod 16 will not accidentally slip off, but can also make slight compensation in the axial direction, so that the grinding head is always close to the pipe wall, thereby improving safety and processing consistency.

[0021] It is further preferred in this embodiment that the lifting displacement drive mechanism 2 includes a screw motor 21, a screw 22, a top plate 23, a first vertical rod 24, a second vertical rod 25, and a lifting plate 26. The screw 22 is arranged perpendicular to the horizontal plane, and the screw motor 21 cooperates with the screw and is used to drive it to rotate. A lifting block 27 is provided at the center hole of the lifting plate 26 that is threadedly engaged with the screw 22. The four first vertical rods 24 are symmetrically fixed on the bottom plate in pairs around the screw 22. The top plate 23 is fixed to the top of the first vertical rod 24. The lifting plate 26 is provided with four through holes that slide with the first vertical rod 24. When the screw 22 rotates, the lifting plate 26 can move up and down. The four second vertical rods 25 are symmetrically fixed in pairs on the lifting plate. Above the descending plate 26, the upper part of the second vertical rod 25 passes through the through hole of the top plate 23 and is fixedly connected to the lifting support plate 41, converting the precise angular displacement of the servo motor into the vertical displacement of the lifting plate 26 without gap. The four first vertical rods 24 form sliding guides on all sides. The lifting plate 26 always remains horizontal when sliding up and down along it, and will not tilt or get stuck. The top plate 23 acts as both an upper end limit and a guide base for the second vertical rod 25, so that the lifting support plate 41 can still obtain four-point support at a high position, with good rigidity and small shaking. The overall structure is compact, the transmission chain is short, the response is fast, and the positioning accuracy is high. It can match the support height required for different pipe diameters in real time to ensure that the center of the pipe always coincides with the grinding axis, thereby ensuring the consistency and surface quality of the entire inner hole processing.

[0022] The present embodiment is further preferred in that the radially adjustable telescopic grinding assembly 5 includes a shaft sleeve 52, a scissor-type combination rod 53, and a mounting plate 54. The two shaft sleeves 52 are arranged relative to each other front and back and are both sleeved on the outside of the support rod 16. The shaft sleeve 52 is fixedly connected to the support rod 16. The outside of each shaft sleeve 52 is provided with three radial protrusions 55. The three radial protrusions 55 are evenly spaced around the circumferential direction of the shaft sleeve 52. The three groups of scissor-type combination rods 53 are also spaced around the circumferential direction. The inner ends of the scissor-type combination rods 53 are rotatably connected to the radial protrusions 55 corresponding to the two shaft sleeves 52 respectively, and the outer first end of the scissor-type combination rod 53 is rotatably connected to the positioning piece 56 on the inner side of the mounting plate 54. The outer second end of the scissor-type combination rod 53 cooperates with the slide rail assembly 57 on the inner side of the mounting plate 54 to form a purely radial telescopic parallelogram mechanism. A compression spring (not shown in the figure) is arranged in the scissor-type combination rod 53 structure. ), specifically, a tension spring can be added between adjacent scissor rods, or a compression spring can be added at the end of the slide rail, and the direction is consistent with the radial expansion and contraction. Both arrangements are acceptable, that is, "external force adjustment" can be changed to "elastic force self-adaptation". When the sanding disc encounters a part where the pipe diameter becomes larger, the reaction force of the pipe wall compresses the spring, and the scissor frame automatically expands outward. When the pipe diameter decreases, the spring rebounds to make the scissor frame synchronously retract inward, always maintaining a constant contact force. The preload force of the spring is converted into a stable positive pressure of the sanding disc on the pipe wall. Regardless of the millimeter-level fluctuation of the pipe diameter due to ovality or weld excess height, the scissor frame can instantly expand and contract to compensate, avoiding manual repeated adjustment, and ensuring uniform inner wall roughness. The mounting piece 54 is arranged in an arc shape, and the grinding sanding disc 51 is arranged on the outside of the mounting piece 54. The two shaft sleeves 52 are locked with the support rod 16 to form a rigid reference. The three groups of scissors are arranged equidistantly along the circumference, so that the sanding disc maintains a concentric circle posture at any radial position, ensuring consistent grinding thickness throughout the entire circumference, and the arc-shaped disc is consistent with the curvature of the pipe wall, thereby increasing the contact angle.

[0023] Example 2 Taking into account the working conditions with a larger range of pipe diameter changes, the mechanical travel of the scissor-spring structure alone is difficult to cover, and the spring stiffness changes nonlinearly with the amount of expansion and contraction, making it difficult to maintain constant pressure. In order to solve this technical problem, another solution is proposed in this embodiment. Specifically, the radially adjustable telescopic grinding assembly 5 includes a linear actuator 58, a sleeve 59, a cross guide plate 510, a connecting rod 511, an adjustment plate 512, and a slider 513. The rear end of the linear actuator 58 is fixedly connected to the support rod 16, and the front end of the linear actuator 58 is provided with a cross guide plate 510. The push rod of the linear actuator 58 passes through the center hole of the cross guide plate 510 and is fixedly connected to the sleeve 59. The outer side of the sleeve 59 is provided with four limit plates 514 evenly spaced around the circumferential direction. The four sides of the cross guide plate 510 are respectively provided with guide sliding holes 515. The slider 513 is slidably connected to the guide sliding holes 515. The adjustment plate 512 is perpendicular to the cross guide plate 510 and fixedly connected to the slider 513. The inner side of the adjustment plate 512 is connected to the limit plate 514 of the sleeve 59 through the connecting rod 511. The outer side of each adjustment plate 512 is provided with a A fixed rod 516 is provided on the outside of the fixed rod 516, and a sand piece positioning plate 517 is provided on the outside of the sand piece positioning plate 517. The outside of the sand piece positioning plate 517 is used to install the sanding piece 51. The linear actuator 58 is used to drive the sleeve 59 to move back and forth so that the connecting rod 511 rotates and the adjustment plate 512 can realize radial displacement adjustment along the direction of the guide slide hole 515. The linear actuator 58 can adopt any linear drive method such as electric push rod and cylinder, directly output axial displacement with motor or cylinder, and then convert it into radial displacement through the connecting rod mechanism. The stroke is programmable and the pressure can be closed-loop controlled. There is no need to adjust the diameter of the pipe when it changes. No mechanical disassembly or assembly is required; the control system simply issues real-time commands to continuously and precisely change the grinding radius within the millimeter range. This active, instant, and stepless adjustment enables the same machine to continuously process pipes of different specifications without stopping the machine, completely eliminating the accuracy and efficiency bottlenecks caused by manual diameter changes or the stiffness limitations of springs 115. The cross guide plate 510 locks the rotational freedom, allowing only pure radial sliding, ensuring that the four sanding discs are always synchronized and concentric. The overall structure is compact, with all moving parts hidden between the sleeve 59 and the cross plate, preventing interference between exposed connecting rods and the pipe wall, making it suitable for complex applications such as deep holes and pipe bends. The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made by technicians in the relevant technical field based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe processing device, characterized in that: Base comprises support, castor, and frame upper is provided with guide rail, and support and conveyer frames movable end contact site are provided with recoil spring or rubber cushion, and castor is arranged on the pin of base bottom four, to carry mobile handler location.

2. A pipe processing device according to claim 1, characterized in that: The horizontal displacement driving mechanism includes a frame, a linear cylinder, a guide rod, a guide seat, a support seat, a guide wheel, and a guide rail. The frame is fixed to the ground. The support seat is arranged at the rear end above the frame, and the cylinder body of the linear cylinder is fixed to the rear side of the support seat. The piston rod of the linear cylinder passes through the front baffle of the support seat forward and is fixedly connected to the slide. Guide seats are respectively provided at the upper and lower positions of the left and right sides of the support seat, and the front and rear ends of the guide rod are respectively fixedly connected to the slide and the rear baffle of the support seat. The guide rod is arranged parallel to the piston rod of the linear cylinder, and the guide rod passes through the inner hole of the guide seat and slides with it. Wheel seats are symmetrically provided on the left and right sides of the lower side of the slide, and each of the wheel seats is connected to a guide wheel. The upper surface of the frame is provided with left and right symmetrical guide rails, and the guide wheels cooperate with the guide rails and can roll back and forth along the direction of the guide rails.

3. The pipe processing device according to claim 1, characterized in that: The clamping mechanism includes a base, a six-jaw chuck, and a chuck servo motor. A fixed bracket is provided on the base, and a chuck servo motor is installed on the fixed bracket. The output shaft of the chuck servo motor is connected to the six-jaw chuck, and the axial direction of the six-jaw chuck coincides with the axial direction of the drive shaft.

4. The pipe processing device according to claim 1, characterized in that: It also includes a spring, the inner hole of the support rod is in sliding cooperation with the drive shaft, the drive shaft is provided with a first radial protrusion, and the rear end of the support rod is provided with a second radial protrusion, the spring is sleeved on the outside of the drive shaft and is located between the first radial protrusion and the second radial protrusion, the outside of the drive shaft is provided with a radial protrusion, the inner hole of the support rod is provided with a sliding groove adapted to the radial protrusion, and the radial protrusion and the sliding groove are adapted to be used for axially limiting the support rod to prevent it from detaching from the drive shaft.

5. The pipe processing device according to claim 1, characterized in that: The lifting displacement drive mechanism includes a screw motor, a screw, a top plate, a first vertical rod, a second vertical rod, and a lifting plate. The screw is arranged perpendicular to the horizontal plane, and the screw motor cooperates with the screw and is used to drive it to rotate. A lifting block that cooperates with the screw thread is provided at the center hole of the lifting plate. Four first vertical rods are symmetrically fixed in pairs around the screw on the bottom plate. The top plate is fixed to the top end of the first vertical rod. The lifting plate is provided with four through holes that slide with the first vertical rod. When the screw rotates, the lifting plate can move up and down. The four second vertical rods are symmetrically fixed in pairs above the lifting plate. The upper part of the second vertical rod passes through the through hole of the top plate and is fixedly connected to the lifting support plate.

6. The pipe processing device according to claim 1, characterized in that: The radially adjustable telescopic grinding assembly includes a shaft sleeve, a scissors-type combination rod, and a mounting plate. The two shaft sleeves are arranged relative to each other front and back and are both sleeved on the outside of the support rod. The shaft sleeve is fixedly connected to the support rod. Three radial protrusions are provided on the outside of each shaft sleeve. The three radial protrusions are evenly spaced around the circumferential direction of the shaft sleeve. Three groups of scissors-type combination rods are also spaced around the circumferential direction. The inner ends of the scissors-type combination rods are respectively rotatably connected to the radial protrusions corresponding to the two shaft sleeves. The outer first end of the scissors-type combination rod is rotatably connected to the positioning piece on the inner side of the mounting piece. The outer second end of the scissors-type combination rod cooperates with the slide rail assembly on the inner side of the mounting piece. The mounting piece is arranged in an arc shape, and the grinding sand piece is arranged on the outside of the mounting piece.

7. The pipe processing device according to claim 1, characterized in that: Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

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