Surface polishing treatment equipment for cast iron well lid production

Abstract

The invention relates to the technical field of well lid machining, in particular to surface polishing treatment equipment for cast iron well lid production, which comprises a polishing part and a polishing box, the polishing part is used for performing multi-stage polishing on the surface of a well lid, and the polishing part is arranged in the polishing box; the inner ring piece is arranged in the polishing box and used for transporting the well lid. The outer supporting track is used for supporting the well lid; the outer supporting track comprises a staggered section and an annular section, and a circle of inner gear ring is fixedly arranged on the lower surface of the outer supporting track; the inner ring piece rotates to drive the well lid to rotate, the inner ring piece and the inner gear ring are matched to enable the well lid to rotate, and the polishing piece is matched to rotate to polish the well lid. Through the special design of the structure of the inner ring piece and the outer supporting track, the well lid can rotate under the cooperation of the inner ring piece and the inner gear ring, all-dimensional polishing of the polishing piece is facilitated, when the well lid moves to the dislocation section of the outer supporting track after being polished, the well lid can rotate, the polished side faces one side of the dust suction box, and therefore the well lid can be conveniently polished. And polishing chippings can be conveniently cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of manhole cover processing, and specifically relates to a surface polishing treatment device for the production of cast iron manhole covers. Background Art

[0002] A cast iron manhole cover is a facility used to cover sewers, drainage outlets or wellheads on roads or public places, and plays an important role in protection, sealing and load-bearing. The main component of a cast iron manhole cover is a cast iron alloy, and the raw materials usually include pig iron, scrap iron and steel.

[0003] Most manhole covers are formed by casting. The cast manhole covers need to be polished before use. After mass production in factories, they may be stored for a long time. Polishing can remove the oxide layer and impurities on the surface of the manhole cover, making the metal matrix purer. The smooth surface formed after polishing is conducive to the aggregation of elements such as chromium and nickel, and then a passivation film is formed, improving the rust prevention performance of the manhole cover. For stainless steel manhole covers, the rust prevention performance after polishing may be increased by 2-3 times.

[0004] During the production process of ductile iron manhole covers, after processes such as casting, cooling, and demoulding, their surfaces usually exhibit a certain degree of roughness. Directly polishing and grinding with relatively fine silicon carbide polishing materials takes a long time and the cost of relatively fine silicon carbide polishing materials is high, which is likely to cause waste of resources. Secondly, when casting cast iron manhole covers, polishing path grooves (depth 0.5-1 mm) are reserved, and a separate small polishing head is required for polishing, which is difficult to polish and affects the polishing efficiency. A large amount of metal chips will be generated during the polishing process, and the metal chips mostly accumulate in the grooves, and it is easy to have the accumulation of grinding debris during the cleaning process, making the cleaning difficult. Summary of the Invention

[0005] In view of the problems in the prior art, the present invention provides a surface polishing treatment device for the production of cast iron manhole covers. When the inner ring member rotates, it can drive the manhole cover to move synchronously towards the polishing member. At this time, the manhole cover will rotate under the cooperation of the inner ring member and the internal gear ring, facilitating the all-round polishing by the polishing member. When the manhole cover finishes polishing and moves to the misaligned section of the outer support track, the manhole cover will rotate, and the polished side faces the dust suction box side, facilitating the cleaning of the polishing debris.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a surface polishing treatment device for the production of cast iron manhole covers, including a polishing member and a polishing box for multi-stage polishing of the surface of the manhole cover, and the polishing member is placed in the polishing box;

[0007] An inner ring member, which is placed in the polishing box and is used for transporting the manhole cover;

[0008] An outer support track, which is used for supporting the manhole cover;

[0009] The outer support track includes a dislocation section and an annular section, and a ring of internal gear rings is fixedly arranged on the lower surface of the outer support track;

[0010] The rotation of the inner ring member drives the manhole cover to rotate. The cooperation between the inner ring member and the internal gear ring enables the manhole cover to rotate self - sufficiently, and the rotation of the polishing member in cooperation polishes the manhole cover.

[0011] Preferably, the inner ring member includes an inner support ring, and a central seat is rotatably connected to the upper surface of the inner support ring;

[0012] An extension rod for limiting the manhole cover is fixedly connected to the side wall of the central seat, and the extension rod contacts the upper surface of the outer support track.

[0013] Preferably, a push disk is rotatably penetrated through the middle of the inner support ring, and the top of the push disk is roughened; the top of the push disk contacts the manhole cover.

[0014] Preferably, a meshing gear is fixedly sleeved on the outer wall of one end of the push disk placed on the lower surface of the inner support ring, and the meshing gear meshes with the internal gear ring.

[0015] Preferably, the inner support ring includes a main support frame, a cooperation seat is arranged in cooperation between the main support frames, and the cooperation seat is connected to the main support frame through a rotating member;

[0016] The central seat is fixedly connected to the cooperation seat.

[0017] Preferably, a dust suction box is communicated and installed on one side wall of the polishing box, and the dislocation section of the outer support track is placed on the side of the polishing box close to the dust suction box.

[0018] Preferably, the polishing box is installed on one side of the workbench, and an adjusting member is arranged on the top of the workbench. The adjusting member is used to drive the polishing member to rotate and drive it to adjust in the horizontal direction.

[0019] Preferably, a connecting platform is fixedly installed at the bottom of the adjusting member, an installation seat is arranged below the connecting platform, and the installation seat is connected to the connecting platform through a locking fastener.

[0020] Preferably, a first polishing grinding wheel is arranged below the installation seat. The first polishing grinding wheel is annular, a second polishing grinding wheel is arranged inside the first polishing grinding wheel and is annularly arranged, and a digital manipulator is fixedly connected to the middle of the installation seat.

[0021] Preferably, an electric control push rod is fixedly connected to the lower surface of the installation seat, and a connecting head is fixedly connected to the telescopic end of the electric control push rod;

[0022] Installation grooves are formed on one side of the first polishing grinding wheel and the second polishing grinding wheel close to the installation seat;

[0023] A pressing block is slidably arranged in the installation groove, and the pressing block is connected to the inner wall of the installation groove through a pressing spring.

[0024] Advantages of the present invention:

[0025] (1) For the surface polishing treatment equipment for the production of cast iron manhole covers of the present invention, compared with the prior art, through the special design of the inner ring member and the outer support track structure, the manhole cover can rotate under the cooperation of the inner ring member and the inner gear ring, which is convenient for the polishing member to polish all directions. When the manhole cover moves to the misaligned section of the outer support track after polishing, the manhole cover will rotate, and the polished side faces the dust suction box side, which is convenient for cleaning the polishing debris.

[0026] (2) For the surface polishing treatment equipment for the production of cast iron manhole covers of the present invention, the electric control push rod is used to control the pressure between the first polishing grinding wheel and the second polishing grinding wheel and the upper surface of the manhole cover during the polishing process. The pressure sensor controls the contact force ≤ N to prevent the first polishing grinding wheel and the second polishing grinding wheel from being damaged too quickly. For the recycled cast iron manhole cover containing % scrap steel, the rotation speeds of the first polishing grinding wheel and the second polishing grinding wheel are reduced by % in the rough polishing stage, and the diamond micropowder concentration is increased to 15wt% when the digital manipulator polishes in the fine polishing stage. An appropriate diamond micropowder concentration can obtain better surface roughness and workpiece surface quality. Description of the drawings

[0027] The present invention will be further described below with reference to the drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a three-dimensional structure schematic diagram of the polishing box of the present invention;

[0030] Figure 3 It is a connection diagram of the driving motor and the inner ring member of the present invention;

[0031] Figure 4 It is a meshing diagram of the inner gear ring and the meshing gear of the present invention;

[0032] Figure 5 It is a connection diagram of the adjusting member and the polishing member of the present invention;

[0033] Figure 6 It is a connection diagram of the mounting seat and the locking buckle of the present invention;

[0034] Figure 7 For the present invention Figure 6 Cross-sectional view;

[0035] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at A in

[0036] In the figure: 100, dust suction box; 200, polishing box; 220, inner ring part; 222, pushing disk; 223, central seat; 224, meshing gear; 225, rotating part; 226, mating seat; 230, outer support track; 231, internal gear ring; 233, offset section; 260, drive motor; 300, workbench; 400, adjusting part;

[0037] 600, polishing part; 601, outer cover; 602, mounting seat; 603, locking fastener; 604, connecting platform; 605, electric control push rod; 606, connecting head; 660, outer elastic cover; 700, first polishing grinding wheel; 701, mounting groove; 702, abutting spring; 703, abutting block; 710, second polishing grinding wheel; 720, digital manipulator. Specific embodiments

[0038] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0039] As Figures 1 - 8 shown, a surface polishing treatment device for the production of cast iron manhole covers according to the present invention includes a polishing part 600 for multi-stage polishing of the manhole cover surface and a polishing box 200, and the polishing part 600 is placed inside the polishing box 200;

[0040] Inner ring part 220, the inner ring part 220 is placed inside the polishing box 200, and the inner ring part 220 is used for transporting the manhole cover;

[0041] Outer support track 230, the outer support track 230 is used for supporting the manhole cover;

[0042] The outer support track 230 includes an offset section 233 and an annular section, and a circle of internal gear rings 231 are fixedly arranged on the lower surface of the outer support track 230;

[0043] The rotation of the inner ring part 220 drives the rotation of the manhole cover, and the cooperation between the inner ring part 220 and the internal gear ring 231 enables the manhole cover to rotate self - sufficiently, and in cooperation with the rotation of the polishing part 600, the manhole cover is polished.

[0044] Before polishing, place the cast iron manhole cover on the upper surface of the inner ring member 220. When the cast iron manhole cover is cast, a polishing path groove is reserved (depth 0.5 - 1 mm), and the surface layer is high-chromium cast iron (Cr 15 - 20%) to enhance wear resistance; the matrix layer: ductile iron to maintain strength; only the high-chromium surface layer needs to be finely polished, reducing energy consumption. During the rotation of the inner ring member 220, it can drive the manhole cover to move synchronously towards the polishing member 600. At this time, the manhole cover will rotate under the cooperation of the inner ring member 220 and the internal gear ring 231, facilitating all-round polishing by the polishing member 600. When the manhole cover finishes polishing and moves to the misaligned section 233 of the outer support track 230, the manhole cover will rotate, and the polished side faces the dust suction box 100 side, facilitating the cleaning of the polished debris.

[0045] Among them, the polishing member 600 can achieve rough polishing and fine polishing. For rough polishing, silicon carbide polishing materials (30 - 100 mesh) are used to remove casting burrs. The rough polishing includes two levels of polishing. First, polish once with 80-mesh silicon carbide polishing materials and then polish a second time with 20-mesh silicon carbide polishing materials; for fine polishing, a multi-degree-of-freedom robotic arm is equipped with a flexible polishing wheel (containing diamond micropowder), and a pressure sensor adjusts the contact force in real time. The digital robotic arm used for fine polishing integrates a multi-spectral imaging system (visible light + near-infrared + laser profile scanning) to construct a three-dimensional topological map of the manhole cover surface: use 3D laser scanning to generate the three-dimensional path of the stiffeners, and the robotic arm drives the polishing wheel (width 15 mm) for polishing. Polish along the direction of the stiffeners at a 45° inclination angle, and the pressure sensor controls the contact force ≤ 80 N. The deep learning algorithm identifies defects such as holes and sand holes (recognition accuracy ≥ 99.2%) to generate a compensated polishing path, driving the robotic arm to perform fixed-point strengthening treatment on the defective area. For the manhole cover treatment, the surface roughness Ra is reduced from 12.5 μm to 0.4 μm in only 3 minutes. The roughness comparison accuracy before and after polishing reaches ±0.05 μm, the polishing efficiency is increased by 2.3 times, and the consumable cost is reduced by 40%.

[0046] Specifically: The inner ring member 220 includes an inner support ring, and a central seat 223 is rotatably connected to the upper surface of the inner support ring;

[0047] A support rod for limiting the manhole cover is fixedly connected to the side wall of the central seat 223, and the support rod contacts the upper surface of the outer support track 230.

[0048] The manhole cover is placed on the upper surface of the central seat 223, the support rod is placed below the manhole cover, and there is a protrusion at the end of the support rod that abuts against the edge position of the manhole cover, which can support the manhole cover when it is tilted. The support rod contacts the upper surface of the outer support track 230 to support the manhole cover by using the outer support track 230, reducing the force on the support rod and ensuring a longer service life.

[0049] The contact position between the extension rod and the bottom of the manhole cover is smoothly arranged. When the manhole cover is subjected to an external force, it can rotate. When the manhole cover moves to the misaligned section 233 of the outer support track 230, the manhole cover rotates until it is inclined. At this time, the protruding end of the extension rod can just support the manhole cover, and the polished side of the manhole cover rotates towards the side of the dust suction box 100. When the manhole cover continues to rotate following the inner ring member 220, the extension rod will slowly rotate from the misaligned section 233 of the outer support track 230 to the annular section of the outer support track 230, and the manhole cover slowly rotates from the inclined state to the horizontal state.

[0050] Specifically: A push disk 222 is rotatably arranged through the middle of the inner support ring, and the top of the push disk 222 is rough; the top of the push disk 222 contacts the manhole cover.

[0051] The push disk 222 can contact the top of the manhole cover. One side of the top of the push disk 222 contacts the bottom edge position of the manhole cover. During the rotation process of the push disk 222, it can push the manhole cover to rotate. Light ductile iron manhole cover: The weight of the manhole cover is about 25 kilograms. Heavy ductile iron manhole cover: The weight of the manhole cover is about 28 kilograms. The top of the push disk 222 is rough to increase the roughness of the contact surface with the manhole cover to achieve the purpose of driving the manhole cover to rotate. Among them, the contact surfaces of the central seat 223 and the extension rod with the manhole cover are both smoothly arranged to achieve the purpose of reducing the rotation resistance of the manhole cover.

[0052] The manhole cover is polished during the rotation process, and the polishing efficiency is better.

[0053] One end outer wall of the push disk 222 placed on the lower surface of the inner support ring is fixedly sleeved with a meshing gear 224, and the meshing gear 224 meshes with the internal gear ring 231. During the rotation of the inner support ring, under the cooperation of the meshing gear 224 and the internal gear ring 231, the meshing gear 224 will rotate.

[0054] Specifically: The inner support ring includes a main support frame, and a cooperation seat 226 is cooperatively arranged between the main support frames. The cooperation seat 226 is connected to the main support frame through a rotating member 225;

[0055] The central seat 223 is fixedly connected to the cooperation seat 226.

[0056] The cooperation seat 226 can rotate relative to the main support frame through the rotating members 225 connected on both sides. The main support frame is connected to the output end of the driving motor 260. The driving motor 260 drives the main support frame to rotate. When the cooperation seat 226 drives the manhole cover to move to the misaligned section 233 of the outer support track 230, the outside of the manhole cover is no longer supported by the outer support track 230. At this time, the manhole cover will tilt until it contacts the misaligned section 233 of the outer support track 230. Among them, the rotating member 225 can be a damping rotator, which can slow down the rotation speed of the manhole cover so that it can rotate slowly and increase the stability during the rotation process.

[0057] Specifically, a dust suction box 100 is connected and installed on one side wall of the polishing box 200, and the misaligned section 233 of the outer support track 230 is placed on the side of the polishing box 200 close to the dust suction box 100.

[0058] The dust suction box collects the polished dust by using wind and static electricity. Coarse particles are recovered through a cyclone separator (particle size > 10 μm, recovery rate 92%). Micron-sized dust is adsorbed by a high-voltage electrostatic field (efficiency ≥ 98%). Nanoscale suspended matter is captured by a circulating water curtain.

[0059] Specifically, the polishing box 200 is installed on one side of the workbench 300. An adjusting member 400 is provided on the top of the workbench 300. The adjusting member 400 is used to drive the polishing member 600 to rotate and drive it to adjust in the horizontal direction.

[0060] The adjusting member 400 can adjust the position of the polishing member 600 and at the same time drive the polishing member 600 to rotate. The adjusting member 400 is a common mechanical structure. During the polishing process, the transmission shaft 410 of the adjusting member 400 controls the polishing member 600 to reach a certain rotational speed. When the polishing area needs to be changed, the rotation of the adjusting member 400 can drive the polishing member 600 to move to a preset position, increasing the applicable range of polishing.

[0061] Specifically, a connecting platform 604 is fixedly installed at the bottom of the adjusting member 400. An installation seat 602 is arranged below the connecting platform 604. The installation seat 602 and the connecting platform 604 are connected by a locking buckle 603.

[0062] The installation seat 602 and the connecting platform 604 are installed and fixed through the multi-directional locking buckle 603, increasing the stability of the connection part. At the same time, it is convenient to disassemble, facilitating subsequent maintenance.

[0063] Specifically, a first polishing grinding wheel 700 is arranged below the installation seat 602. The first polishing grinding wheel 700 is annular. A second polishing grinding wheel 710 is arranged inside the first polishing grinding wheel 700. The second polishing grinding wheel 710 is annularly arranged. A digital manipulator 720 is fixedly connected to the middle of the installation seat 602.

[0064] The first polishing grinding wheel 700 uses 80 - mesh silicon carbide polishing material for polishing, which can perform the first - round polishing on the relatively rough part of the manhole cover surface. The second polishing grinding wheel 710 uses 20 - mesh silicon carbide polishing material for secondary polishing, which can ensure that the manhole cover is polished to the preset range. Directly using the second polishing grinding wheel 710 for polishing may cause more waste of the second polishing grinding wheel 710. The digital manipulator 720 can construct a three - dimensional topological map of the manhole cover surface by integrating a multi - spectral imaging system (visible light + near - infrared + laser profile scanning): using 3D laser scanning to generate the three - dimensional path of the reinforcing rib, the robotic arm drives the polishing wheel (width 15 mm) for polishing, polishes along the direction of the reinforcing rib at an inclination angle of 45°, the polishing pressure sensor controls the contact force ≤80 N, and the deep - learning algorithm identifies defects such as holes and sand holes (recognition accuracy ≥99.2%) to generate a compensated polishing path, driving the robotic arm to perform fixed - point strengthening treatment on the defective area. For the manhole cover, it only takes 3 minutes to reduce the surface roughness Ra from 12.5 μm to 0.4 μm, the roughness comparison accuracy before and after polishing reaches ±0.05 μm, the polishing efficiency is increased by 2.3 times, and the consumable cost is reduced by 40%. Among them, when the cast - iron manhole cover is cast, a polishing path groove (depth 0.5 - 1 mm) is reserved, and the digital manipulator 720 is used for polishing to improve the polishing efficiency.

[0065] Specifically, an electric control push rod 605 is fixedly connected to the lower surface of the mounting seat 602, and a connecting head 606 is fixedly connected to the telescopic end of the electric control push rod 605;

[0066] On one side of the first polishing grinding wheel 700 and the second polishing grinding wheel 710 close to the mounting seat 602, mounting grooves 701 are provided;

[0067] A pressing block 703 is slidably arranged in the mounting groove 701, and the pressing block 703 is connected to the inner wall of the mounting groove 701 through a pressing spring 702.

[0068] An outer elastic cover 660 is arranged between the mounting seat 602 and the first polishing grinding wheel 700, which can prevent the entry of metal chips. Among them, an outer cover 601 is arranged on the top of the mounting seat 602, which also plays a role in preventing the entry of metal chips.

[0069] Through the setting of the electric control push rod 606, it can control the contact between the first polishing grinding wheel 700, the second polishing grinding wheel 710 and the surface of the manhole cover to be polished. When the first polishing grinding wheel 700 finishes polishing, it can control the second polishing grinding wheel 710 to contact the manhole cover. According to actual needs, it can also contact the manhole cover simultaneously for polishing. Through the cooperation of the pressing block 703 and the connecting head 606, the first polishing grinding wheel 700 and the second polishing grinding wheel 710 can be disassembled and replaced more quickly. Among them, according to actual needs, the first polishing grinding wheel 700 and the second polishing grinding wheel 710 can also be installed with silicon carbide polishing materials of the same roughness for polishing, and the applicability is more extensive.

[0070] The pressing spring 702 can push the pressing block 703 to press against the connecting head 606. Both the pressing block 703 and the connecting head 606 are provided with inclined surfaces that facilitate insertion and extraction, ensuring a smoother installation or disassembly process.

[0071] The electric control push rod 606 controls the pressure between the first polishing grinding wheel 700 and the second polishing grinding wheel 710 and the upper surface of the manhole cover during the polishing process. The pressure sensor controls the contact force ≤80 N to prevent the first polishing grinding wheel 700 and the second polishing grinding wheel 710 from being damaged too quickly. For a recycled cast iron manhole cover containing 30% scrap steel, the rotation speeds of the first polishing grinding wheel 700 and the second polishing grinding wheel 710 are reduced by 20% in the rough polishing stage. When the digital manipulator 720 performs polishing in the fine polishing stage, the concentration of diamond micropowder is increased to 15 wt%. An appropriate concentration of diamond micropowder can obtain better surface roughness and workpiece surface quality.

[0072] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope claimed by the present invention. The scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface polishing equipment for cast iron manhole cover production, characterized in that: It comprises a polishing piece (600) for performing multi-stage polishing on the surface of a manhole cover and a polishing box (200), wherein the polishing piece (600) is placed in the polishing box (200); An inner ring member (220), the inner ring member (220) being placed in the polishing box (200), and the inner ring member (220) being used to transport the manhole cover; An outer support rail (230), the outer support rail (230) being used to support the manhole cover; The outer support track (230) comprises an offset segment (233) and an annular segment, and a circle of inner gear rings (231) is fixedly provided on the lower surface of the outer support track (230); The inner ring member (220) rotates to drive the manhole cover to rotate, and the inner ring member (220) cooperates with the inner gear ring (231) to enable the manhole cover to rotate, and cooperates with the polishing member (600) to rotate to polish the manhole cover.

2. The surface polishing equipment for cast iron manhole cover production according to claim 1 is characterized in that: The inner ring member (220) comprises an inner support ring, and a center seat (223) is rotatably connected to the upper surface of the inner support ring; An extension rod for limiting the position of the manhole cover is fixedly connected to the side wall of the central seat (223), and the extension rod is in contact with the upper surface of the outer support rail (230).

3. The surface polishing equipment for cast iron manhole cover production according to claim 1 is characterized in that: A push disk (222) is rotatably arranged in the middle of the inner support ring and penetrates through it. The top of the push disk (222) is arranged roughly; the top of the push disk (222) contacts the manhole cover.

4. The surface polishing equipment for producing cast iron manhole covers according to claim 3 is characterized in that: The outer wall fixed sleeve of one end of the pushing plate (222) placed on the lower surface of the inner support ring is provided with a meshing gear (224), and the meshing gear (224) meshes with the inner gear ring (231).

5. The surface polishing equipment for producing cast iron manhole covers according to claim 3 is characterized in that: The inner support ring comprises a main support frame, a matching seat (226) is arranged between the main support frames, and the matching seat (226) is connected to the main support frame via a rotating member (225); The center seat (223) is fixedly connected to the matching seat (226).

6. The surface polishing equipment for producing cast iron manhole covers according to claim 1, characterized in that: A dust collection box (100) is installed in communication with a side wall of the polishing box (200), and the offset section (233) of the outer support track (230) is disposed on a side of the polishing box (200) close to the dust collection box (100).

7. The surface polishing equipment for producing cast iron manhole covers according to claim 1, characterized in that: The polishing box (200) is installed on one side of the workbench (300), and an adjusting member (400) is arranged on the top of the workbench (300). The adjusting member (400) is used to drive the polishing member (600) to rotate and drive it to adjust in the horizontal direction.

8. The surface polishing equipment for producing cast iron manhole covers according to claim 7, characterized in that: A connecting platform (604) is fixedly mounted on the bottom of the adjusting member (400), a mounting seat (602) is arranged below the connecting platform (604), and the mounting seat (602) is connected to the connecting platform (604) via a locking buckle (603).

9. The surface polishing equipment for producing cast iron manhole covers according to claim 8, characterized in that: A first polishing wheel (700) is arranged below the mounting seat (602), the first polishing wheel (700) is annular, a second polishing wheel (710) is arranged inside the first polishing wheel (700), the second polishing wheel (710) is annular, and a digital manipulator (720) is fixedly connected to the middle of the mounting seat (602).

10. The surface polishing equipment for producing cast iron manhole covers according to claim 9, characterized in that: An electric control push rod (605) is fixedly connected to the lower surface of the mounting seat (602), and a connecting head (606) is fixedly connected to the telescopic end of the electric control push rod (605); The first polishing grinding wheel (700) and the second polishing grinding wheel (710) are both provided with a mounting groove (701) on one side close to the mounting seat (602); A pressing block (703) is slidably disposed in the installation groove (701), and the pressing block (703) is connected to the inner wall of the installation groove (701) via a pressing spring (702).

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