Fixed-distance conveying device for metal polishing

Abstract

The invention relates to the technical field of polishing, and discloses a fixed-distance conveying device for metal polishing, which comprises a driving part, the driving part comprises a base, the base is slidably connected with a driving unit and a polishing part through a guide rail arranged on the upper surface of the base, the polishing part comprises a rack, and the bottom of the rack is fixedly connected with the upper surface of the base. A first output shaft and a second output shaft are arranged in the rack, and the outer end of the first output shaft and the outer end of the second output shaft are both in transmission connection with the interior of the driving unit. The fixed-distance conveying device for metal polishing can effectively solve the problems that in the prior art, when a metal pipeline is polished, the inner wall and the outer wall of the metal pipeline cannot be polished at the same time, meanwhile, most of polishing materials rub the surface layer of the inner wall of the metal, the overall polishing effect is poor, and the polishing effect is poor. And the device is difficult to adapt to polishing and grinding of pipelines with different diameters within a certain range.

Description

Technical Field

[0001] The invention relates to the technical field of polishing, and in particular to a fixed-distance conveying device for metal polishing. Background Art

[0002] Metal pipe polishing refers to the use of a series of physical and chemical methods to treat the inner and outer surfaces of metal pipes to improve their gloss, flatness and cleanliness, remove surface defects such as oxide layers, rust, welding slag, burrs, etc., to achieve the purpose of improving appearance, enhancing corrosion resistance and extending service life.

[0003] In the prior art, when polishing metal pipes, it is impossible to polish and grind the inner and outer walls of the metal pipes at the same time. At the same time, most of the polishing materials slide on the surface of the inner wall of the metal, and the overall polishing effect is poor. It is also difficult to adapt to the polishing and grinding of pipes of different diameters within a certain range. The rust removal efficiency is low, and multiple processing steps are required to complete the polishing. Summary of the invention

[0004] Technical issues solved In view of the above-mentioned shortcomings of the prior art, the present invention provides a fixed-distance conveying device for metal polishing, which can effectively solve the problem in the prior art that when a metal pipe is polished, the inner and outer walls of the metal pipe cannot be polished and ground at the same time, and at the same time, most of the polishing materials slip on the surface of the inner wall of the metal, resulting in poor overall polishing effect, and it is difficult to adapt to the polishing and grinding of pipes of different diameters within a certain range. Technical Solution

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a fixed-distance conveying device for metal polishing, comprising: A driving unit, the driving unit comprising a base, the base being slidably connected to a driving unit via a guide rail arranged on an upper surface thereof; A polishing part, wherein the polishing part comprises a frame, the bottom of the frame is fixedly connected to the upper surface of the base, a first output shaft and a second output shaft are respectively arranged inside the frame, and the outer ends of the first output shaft and the second output shaft are both transmission-connected to the inside of the driving unit, a polishing wheel that fits tightly to the outer surface of the external metal tube is fixedly connected to one end of the first output shaft away from the driving unit, and a grinding piece that can be used for polishing the inner wall of the external metal tube is arranged at one end of the second output shaft away from the driving unit; Among them, the grinding part includes a connecting rod, one end of the connecting rod close to the driving unit is fixedly connected to the outer end of the second output shaft, the inside of the connecting rod is rotatably connected to a support arm via a rotating shaft, two support arms are provided and are symmetrically distributed with the connecting rod as the center, and the end of the support arm away from the connecting rod is rotatably connected to a grinder via a rotating shaft.

[0006] Furthermore, it also includes a conveying part, which includes a lifting platform, a guide wheel is rotatably installed above the lifting platform, two guide wheels are provided and arranged in parallel, a baffle is provided on one side of the guide wheel, a loading assembly is provided on the side of the baffle away from the guide wheel, a unloading plate is provided below the guide wheel, a loading platform is provided on the side of the loading assembly away from the baffle, a lifting plate is provided between the loading assembly and the unloading plate, and a cylinder is provided on the lower surface of the lifting plate.

[0007] Furthermore, the loading assembly includes a reinforcing plate, the lower surface of the reinforcing plate is fixedly connected to the outer side of the unloading plate through a lifting plate, the outer side of the reinforcing plate is fixedly connected with a tilting block, two tilting blocks are provided and are symmetrically distributed with the reinforcing plate as the center, the tilting block is slidingly connected to the outer surface of the loading platform through an extension plate on the side away from the lifting plate, the tilting block is rotatably connected to the loading plate through a placement groove opened inside it, and the outer surface of the loading plate is provided with a reset spring connected to the inner wall of the placement groove.

[0008] Furthermore, the guide wheel is located directly below the grinding piece, the distance between a pair of the guide wheels is greater than the width of the unloading plate, the upper surface of the unloading plate adopts an arc design, and the inner side of the loading platform adopts a slope design.

[0009] Furthermore, the support arm is connected to a bending spring via a limit block arranged on its side, an abutment plate is arranged at one end of the bending spring away from the limit block, and two abutment plates are arranged and symmetrically distributed with the support arm as the center.

[0010] Furthermore, the grinder includes a counterweight, and one end of the support arm away from the connecting rod is rotatably connected to the inside of the counterweight through a rotating shaft, and the outer surface of the rotating shaft is sleeved with a torsion spring connected to the inside of the counterweight, and the side surfaces of the counterweight are respectively fixedly connected with a rough polishing plate and a fine polishing plate that fits the inner wall of the external metal tube, and the rough polishing plate and the fine polishing plate are symmetrically distributed with the counterweight as the center.

[0011] Furthermore, the radius of the rough polishing plate and the fine polishing plate is greater than the radius of the external metal tube, and a limiting ring is sleeved on the circumferential outer surface of the guide wheel. Beneficial Effects

[0012] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is aimed at the polishing of metal pipes. The polishing part is provided with two polishing heads, a polishing wheel and a grinding piece, which can polish the inner wall and the outer wall of the metal pipe at the same time. At the same time, the rough polishing plate and the fine polishing plate in the grinding piece are both designed with arc surface. The radius of the rough polishing plate and the fine polishing plate is larger than the radius of the external metal pipe. The two torsion springs in different directions provided in the grinder can make the grinder give the grinder a damping state when the grinding piece rotates forward, so that the rough polishing plate or the fine polishing plate is close to the inner wall of the metal pipe when centrifugally advancing, thereby increasing the polishing area and improving the polishing efficiency. The two different grinding materials of the rough polishing plate and the fine polishing plate provided on the grinding piece can complete two procedures on the same production line, saving time and labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 It is a schematic diagram of a three-dimensional multi-angle structure of an embodiment of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of a conveying part according to an embodiment of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of a loading assembly, a loading plate and a lifting plate according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of the transformation of the front view state of the feeding component according to an embodiment of the present invention; Figure 6 It is a schematic structural diagram of the three-dimensional state transformation of the first output shaft, the second output shaft, the polishing wheel and the polishing piece according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the grinding piece according to an embodiment of the present invention; Figure 8 It is a schematic diagram of the three-dimensional partial separation structure of the grinding piece according to an embodiment of the present invention.

[0015] The numbers in the figure represent: 1, driving part; 11, base; 12, guide rail; 13, driving unit; 2, polishing part; 21, frame; 22, first output shaft; 23, second output shaft; 24, polishing wheel; 25, polishing piece; 251, connecting rod; 252, supporting arm; 2521, limit block; 2522, bending spring; 2523, abutment plate; 253, polisher; 2531, matching Weight block; 2532, torsion spring; 2533, rough polishing plate; 2534, fine polishing plate; 3, conveying unit; 30, lifting platform; 31, guide wheel; 311, limit ring; 32, baffle; 33, loading assembly; 331, reinforcement plate; 332, tilting block; 3321, placement groove; 333, loading plate; 334, reset spring; 34, unloading plate; 35, lifting plate; 36, loading platform; 37, cylinder. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention will be further described below in conjunction with the embodiments. Example

[0018] See also Figure 1-Figure 8 The present invention provides a technical solution: a fixed-distance conveying device for metal polishing, comprising: The driving part 1 comprises a base 11, and the base 11 is slidably connected to a driving unit 13 via a guide rail 12 arranged on the upper surface thereof; The polishing part 2 includes a frame 21, the bottom of the frame 21 is fixedly connected to the upper surface of the base 11, and the frame 21 is provided with a first output shaft 22 and a second output shaft 23, respectively. The outer ends of the first output shaft 22 and the second output shaft 23 are both connected to the driving unit 13. The end of the first output shaft 22 away from the driving unit 13 is fixedly connected to a polishing wheel 24 that fits tightly to the outer surface of the external metal tube, and the end of the second output shaft 23 away from the driving unit 13 is provided with a grinding piece 25 that can be used for polishing the inner wall of the external metal tube; Among them, the grinding piece 25 includes a connecting rod 251, one end of the connecting rod 251 close to the driving unit 13 is fixedly connected to the outer end of the second output shaft 23, the inside of the connecting rod 251 is rotatably connected to a support arm 252 through a rotating shaft, and two support arms 252 are provided and symmetrically distributed with the connecting rod 251 as the center, and the end of the support arm 252 away from the connecting rod 251 is rotatably connected to a grinder 253 through a rotating shaft.

[0019] The conveying part 3 also includes a conveying part 3, which includes a lifting platform 30. A guide wheel 31 is rotatably installed above the lifting platform 30. Two guide wheels 31 are provided and arranged in parallel. A baffle plate 32 is provided on one side of the guide wheel 31. A loading assembly 33 is provided on the side of the baffle plate 32 away from the guide wheel 31. A discharge plate 34 is provided below the guide wheel 31. A loading platform 36 is provided on the side of the loading assembly 33 away from the baffle plate 32. A lifting plate 35 is provided between the loading assembly 33 and the discharge plate 34, and a cylinder 37 is provided on the lower surface of the lifting plate 35.

[0020] The loading assembly 33 includes a reinforcing plate 331, the lower surface of the reinforcing plate 331 is fixedly connected to the outer side of the unloading plate 34 through the lifting plate 35, the outer side of the reinforcing plate 331 is fixedly connected with a tilting block 332, two tilting blocks 332 are provided and are symmetrically distributed with the reinforcing plate 331 as the center, the tilting block 332 is slidingly connected to the outer surface of the loading platform 36 through an extension plate on the side away from the lifting plate 35, the tilting block 332 is rotatably connected to the loading plate 333 through a placement groove 3321 opened therein, and the outer surface of the loading plate 333 is provided with a return spring 334 connected to the inner wall of the placement groove 3321.

[0021] The guide wheel 31 is located directly below the grinding piece 25 . The distance between a pair of guide wheels 31 is greater than the width of the blanking plate 34 . The upper surface of the blanking plate 34 is designed to be arc-shaped, and the inner side of the loading platform 36 is designed to be inclined.

[0022] The support arm 252 is connected to a bending spring 2522 via a limit block 2521 arranged on its side. An abutment plate 2523 is arranged at one end of the bending spring 2522 away from the limit block 2521. Two abutment plates 2523 are arranged and symmetrically distributed with the support arm 252 as the center.

[0023] The grinder 253 includes a counterweight 2531, and one end of the support arm 252 away from the connecting rod 251 is rotatably connected to the inside of the counterweight 2531 through a rotating shaft, and the outer surface of the rotating shaft is sleeved with a torsion spring 2532 connected to the inside of the counterweight 2531, and the sides of the counterweight 2531 are fixedly connected with a rough polishing plate 2533 and a fine polishing plate 2534 that fit the inner wall of the external metal tube, and the rough polishing plate 2533 and the fine polishing plate 2534 are symmetrically distributed with the counterweight 2531 as the center.

[0024] The radius of the rough polishing plate 2533 and the fine polishing plate 2534 is greater than the radius of the external metal tube, and a limiting ring 311 is sleeved on the circumferential outer surface of the guide wheel 31 .

[0025] refer to Figure 1-Figure 8 When polishing metal pipes, it is impossible to polish the inner and outer walls of the metal pipes at the same time. At the same time, most of the polishing materials slide on the surface of the inner wall of the metal, and the overall polishing effect is poor. It is difficult to adapt to the polishing of pipes with different diameters within a certain range, and the rust removal efficiency is low. Multiple processing steps are required to complete the polishing; In order to overcome the above-mentioned defects, the present invention designs a fixed-distance conveying device for metal polishing, which can realize the fixed-distance feeding of the metal pipe to be processed, and simultaneously realize the polishing and grinding of the inner and outer walls of the metal pipe to be processed.

[0026] Metal pipe feeding process: In actual application, several groups of metal tubes to be processed are placed in the loading platform 36 of the conveying part 3 by an external manipulator. The loading platform 36 is a downwardly inclined slope. The tilting block 332 in the loading assembly 33 is also tilted downward in the initial state. The initial tilting angle of the tilting block 332 is the same as that of the loading platform 36. Under the action of gravity, the metal tubes to be processed will roll into the loading assembly 33. At this time, the cylinder 37 arranged under the lifting plate 35 will drive the reinforcing plate 331 and the tilting block 332 to move upward after receiving the command. When moving upward, the extension plate connected to the tilting block 332 abuts against the loading platform 36, ensuring the smooth operation of the loading assembly 33 (at the same time, the extension plate also plays a role in resisting the metal tubes that will continue to roll down, preventing the metal tubes from sliding into the machine and affecting the operation). At this time, when the tilt block 332 is raised to the highest point, the loading plate 333 is freed from the resistance of the baffle 32, and under the pulling force of the return spring 334 in the placement groove 3321, it is unfolded toward the guide wheel 31. When the loading plate 333 and the tilt block 332 are unfolded at the same inclined angle, they will be resisted by the baffle 32 and stop unfolding. At this time, the metal pipe on the loading assembly 33 will roll down and will be above the two guide rails 12, and the loading process of the metal pipe is completed. The cylinder 37 starts to drive the loading assembly 33 to move downward. The lower part of the loading plate 333 is designed in an arc shape. During the descent process, the loading plate 333 presses against the baffle 32 and folds upward along the arc surface. The return spring 334 is stretched, and at the same time, the next metal pipe to be processed rolls into the loading assembly 33. When processing metal pipes of different diameters, the height of the lifting platform 30 can be adjusted to adapt to the changes in different centers of circles, so that the second output shaft 23 is concentric with the processed pipe.

[0027] Metal pipe grinding process: In actual application, the servo motor inside the driving unit 13 in the driving part 1 starts to operate, driving the first output shaft 22 and the second output shaft 23 to rotate at high speed, and the frame 21 supports the front section of the first output shaft 22 and the second output shaft 23. At the same time, other motors in the driving unit 13 are started, and they rotate in cooperation with the screw rods arranged on the surface of the base 11, driving the polishing part 2 to slide forward on the surface guide rail 12. The initial polishing piece 25 is in the damping expansion state. During the forward movement of the polishing piece 25, it first touches the metal pipe. After the metal pipe slides forward for a short distance under the action of the thrust, it will be resisted by the limit ring 311 at the outer end of the guide wheel 31. The support arm 252 resists the outer diameter of the metal pipe. As the polishing part 2 continues to move forward, the two abutment plates 2523 close to the inside are close together. Under the action of the thrust, the two bending springs 2522 close to the inside are squeezed and deformed, and the two support arms 252 form an angle inward. Under the action of the torsion spring 2532, the grinder 253 is parallel to the support arm 252, the grinder 25 continues to move forward, the support arm 252 completely enters the inner wall of the pipe, the outer wall of the rough polishing plate 2533 is tangent to the grinder 253, and the grinder 253 and the support arm 252 rotate into the metal pipe under the action of thrust. The surface of the rough polishing plate 2533 is an arc surface and the radius is larger than the metal pipe. The grinder 253 is subjected to the centrifugal force of the rotation of the second output shaft 23 and the damping effect of the torsion spring 2532, and the rough polishing plate 2533 is close to the inner wall of the metal pipe and performs a spiral forward motion. After the grinder 25 completely enters the metal pipe, the first output shaft 22 drives the polishing wheel 24 to rotate and move forward. The surface of the polishing wheel 24 is made of a brush material, and the surface of the metal pipe is polished during the forward process. The polishing part 2 continues to move forward to the outermost end, and the support arm 252 and the grinder 253 are respectively expanded outwardly under the action of the bending spring 2522 and the torsion spring 2532, so that the metal pipe has completed the first outer wall polishing and the rough polishing of the inner wall. The motor in the driving unit 13 rotates in the opposite direction to drive the polishing part 2 to return, and the polishing wheel 24 rotates backward to perform secondary polishing and grinding on the metal surface. During the retreat process, the grinding piece 25 first touches the metal pipe. After the metal pipe slides backward for a short distance under the action of thrust, it will be supported by the limit ring 311 at the rear end of the guide wheel 31. The support arm 252 supports the outer diameter of the metal pipe. As the polishing part 2 continues to retreat, the two abutment plates 2523 close to the outside are close together. Under the action of force, the two bending springs 2522 close to the outside are squeezed and deformed, and the two support arms 252 form an angle outward.Under the action of the torsion spring 2532, the grinder 253 is parallel to the support arm 252, the grinding piece 25 continues to move forward, the support arm 252 completely enters the inner wall of the pipe, the outer wall of the fine polishing plate 2534 is tangent to the grinder 253, and the grinder 253 and the support arm 252 rotate into the metal pipe under the action of thrust. The surface of the fine polishing plate 2534 is an arc surface and the radius is larger than the metal pipe. The grinder 253 is subjected to the rotation centrifugal force of the second output shaft 23 and the damping effect of the torsion spring 2532, and the fine polishing plate 2534 is close to the inner wall of the metal pipe and performs a spiral backward movement. When the polishing part 2 slides to the rear end, the support arm 252 and the grinder 253 are respectively expanded to the outer plane under the action of the bending spring 2522 and the torsion spring 2532, so that the metal pipe has completed two outer wall polishings and the rough polishing and fine polishing of the inner wall.

[0028] The above polishing process has the following advantages: Advantage 1: The polishing part 2 is provided with two polishing heads, namely a polishing wheel 24 and a grinding piece 25. As can be seen from the above, the two heads cooperate with each other to realize the synchronous polishing and grinding of the inner wall and the outer wall of the metal pipe.

[0029] Advantage 2: The rough polishing plate 2533 and the fine polishing plate 2534 in the grinding piece 25 are designed with an arc surface, and the radius of the rough polishing plate 2533 and the fine polishing plate 2534 is greater than the radius of the external metal tube. When the rough polishing plate 2533 or the fine polishing plate 2534 contacts the inner wall of the metal tube, it will be slightly deformed. During the grinding process, the rough polishing plate 2533 or the fine polishing plate 2534 will be elastically deformed under the action of centrifugal force, so that it fits tightly with the inner wall of the metal tube, meeting the polishing requirements of metal tubes with different diameters within a certain range. Under the elastic force of the torsion spring 2532, the grinding piece 25 can keep the rough polishing plate 2533 and the fine polishing plate 2534 close to the inner wall of the metal tube during the rotation and forward movement, thereby increasing the polishing area and further improving the polishing efficiency.

[0030] Advantage three, the "rotation directions of the grinding piece 25 and the polishing wheel 24 are opposite" (it should be emphasized that during the processing of the present invention, the guide wheel 31 has not yet been started), which will make the friction force of the metal polishing inside and outside basically consistent, maintain the force balance, and avoid the metal tube from rotating during the processing, which affects the polishing efficiency.

[0031] Advantage 4: When the inner wall is polished while the grinding piece 25 is advancing under the thrust of the driving part 1, the grinding piece 25 adopts a processing method of spiral rotation while advancing, so that impurities are quickly separated during the processing of the grinding piece 25 (the processing part changes all the time), and the corners missed during the polishing process are reduced. The grinding piece 25 is provided with two different grinding materials, the rough polishing plate 2533 and the fine polishing plate 2534, which can complete two procedures (advance and retreat, two-way reciprocating process) on the same production line, saving time and labor.

[0032] Advantage 5: The bending spring 2522 provided on the support arm 252 and the two torsion springs 2532 provided on the grinder 253 in opposite directions can quickly expand outward after the rough polishing is completed and return to a horizontal state so as to carry out the fine polishing process. At the same time, during the expansion process, the common elastic force of the bending spring 2522 and the torsion spring 2532 will cause the rough polishing plate 2533 and the fine polishing plate 2534 to vibrate at a high frequency, accelerate the separation of metal impurities on the surface of the rough polishing plate 2533, save the trouble of manual cleaning, and reduce the interference of metal impurities on the surface of the rough polishing plate 2533 with the subsequent fine polishing.

[0033] Advantage six: the grinding piece 25 polishes the inner wall of the metal tube under the rotation of the second output shaft 23; the rough polishing plate 2533 or the fine polishing plate 2534 undergoes elastic deformation under the action of centrifugal force and adheres to the inner wall of the metal tube; its own elastic force cooperates with the centrifugal force to generate vibration on the rough polishing plate 2533 or the fine polishing plate 2534, thereby accelerating the shedding of rust and other impurities during the polishing process.

[0034] Advantage seven: the fine polishing plate 2534 and the rough polishing plate 2533 at the grinder 253 are arc-shaped in design, close to the inner wall of the metal pipe, and can wipe off dust during the rotational grinding process. When they are separated, impurities such as rust can be brought out.

[0035] Metal pipe cutting process: After the polishing of the metal tube is completed, the cylinder 37 receives the command and drives the lifting plate 35 to move upward. One end of the surface of the lifting plate 35 is connected to a tilting block 332, and the other end is connected to a blanking plate 34. The tilting block 332 and the blanking plate 34 make lifting and lowering movements at the same time. The width of the blanking plate 34 is smaller than the gap between the two guide wheels 31, and it is tilted downward. When the blanking plate 34 is raised, it follows the rotation direction of the guide wheel 31 to lift the metal tube and roll it to the next process. The loading assembly 33 is also raised, and the metal tube to be processed in the loading assembly 33 is sent between the two guide wheels 31. The lowest end of the blanking plate 34 is higher than the lowest end of the surface of the loading assembly 33, which ensures that the metal tube is first unloaded and then loaded. This movement simultaneously completes the loading and unloading of the metal pipe, saving production processes.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fixed distance conveying device for metal polishing, characterized in that: include: A driving unit (1), the driving unit (1) comprising a base (11), the base (11) being slidably connected to a driving unit (13) via a guide rail (12) provided on an upper surface thereof; A polishing section (2), the polishing section (2) comprising a frame (21), the bottom of the frame (21) being fixedly connected to the upper surface of the base (11), the frame (21) being provided with a first output shaft (22) and a second output shaft (23) respectively inside the frame (21), and the outer ends of the first output shaft (22) and the second output shaft (23) are both drivingly connected to the inside of the driving unit (13), the end of the first output shaft (22) away from the driving unit (13) being fixedly connected to a polishing wheel (24) that is tightly fitted to the outer surface of the external metal tube, and the end of the second output shaft (23) away from the driving unit (13) being provided with a grinding piece (25) that can be used for polishing the inner wall of the external metal tube; The grinding member (25) comprises a connecting rod (251), one end of the connecting rod (251) close to the driving unit (13) is fixedly connected to the outer end of the second output shaft (23), the interior of the connecting rod (251) is rotatably connected to a support arm (252) via a rotating shaft, two support arms (252) are provided and are symmetrically distributed around the connecting rod (251), and one end of the support arm (252) away from the connecting rod (251) is rotatably connected to a grinder (253) via a rotating shaft.

2. A fixed distance conveying device for metal polishing according to claim 1, characterized in that: The conveying device also comprises a conveying portion (3), wherein the conveying portion (3) comprises a lifting platform (30), a guide wheel (31) is rotatably mounted above the lifting platform (30), two guide wheels (31) are provided and are arranged in parallel, a baffle (32) is provided on one side of the guide wheel (31), a loading assembly (33) is provided on the side of the baffle (32) away from the guide wheel (31), a discharge plate (34) is provided below the guide wheel (31), a loading platform (36) is provided on the side of the loading assembly (33) away from the baffle (32), a lifting plate (35) is provided between the loading assembly (33) and the discharge plate (34), and a cylinder (37) is provided on the lower surface of the lifting plate (35).

3. A fixed-distance conveying device for metal polishing according to claim 2, characterized in that: The loading assembly (33) comprises a reinforcing plate (331), the lower surface of the reinforcing plate (331) being fixedly connected to the outer side of a loading plate (34) via a lifting plate (35), the outer side of the reinforcing plate (331) being fixedly connected to a tilting block (332), two tilting blocks (332) being provided and symmetrically distributed with the reinforcing plate (331) as the center, the side of the tilting block (332) away from the lifting plate (35) being slidably connected to the outer surface of a loading platform (36) via an extension plate, the tilting block (332) being rotatably connected to the loading plate (333) via a placement groove (3321) provided therein, and the outer surface of the loading plate (333) being provided with a return spring (334) connected to the inner wall of the placement groove (3321).

4. A fixed distance conveying device for metal polishing according to claim 2, characterized in that: The guide wheels (31) are located directly below the grinding piece (25); the distance between a pair of guide wheels (31) is greater than the width of a blanking plate (34); the upper surface of the blanking plate (34) is designed to be arc-shaped; and the inner side of the loading platform (36) is designed to be inclined.

5. A fixed-distance conveying device for metal polishing according to claim 1, characterized in that: The support arm (252) is connected to a bending spring (2522) via a limit block (2521) arranged on its side; an abutment plate (2523) is arranged at one end of the bending spring (2522) away from the limit block (2521); two abutment plates (2523) are arranged and symmetrically distributed around the support arm (252) as the center.

6. A fixed distance conveying device for metal polishing according to claim 2, characterized in that: The grinder (253) comprises a counterweight (2531); one end of the support arm (252) away from the connecting rod (251) is rotatably connected to the inside of the counterweight (2531) via a rotating shaft; a torsion spring (2532) connected to the inside of the counterweight (2531) is sleeved on the circumferential outer surface of the rotating shaft; a rough polishing plate (2533) and a fine polishing plate (2534) respectively fitted to the inner wall of the external metal tube are fixedly connected to the side of the counterweight (2531); the rough polishing plate (2533) and the fine polishing plate (2534) are symmetrically distributed with the counterweight (2531) as the center.

7. A fixed distance conveying device for metal polishing according to claim 6, characterized in that: The radii of the rough polishing plate (2533) and the fine polishing plate (2534) are greater than the radius of the external metal tube, and a limiting ring (311) is sleeved on the circumferential outer surface of the guide wheel (31).

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