Polishing device special for nodular cast iron bearing

Abstract

The invention discloses a special polishing device for a nodular cast iron bearing, which belongs to the field of nodular cast iron bearing processing and comprises a polishing rack, a plurality of groups of electric guide rods are fixedly mounted on the polishing rack, the top of a threaded rod extends to a circular cavity, and a polishing unit is slidably arranged on the outer surface of the threaded rod and used for polishing the bearing. The outer surface of the threaded rod is sleeved with a top disc in a threaded mode. Through the arrangement of the threaded rod, the driving motor, the top disc, the coarse grinding assembly and the fine grinding assembly, when the bearing is ground, the driving motor is started to drive the threaded rod to rotate, the action that the fine grinding assembly moves up and down is achieved, and then the coarse grinding assembly and the fine grinding assembly work through threads on the threaded rod; the inner surface of the bearing can be finely ground and polished, in the bearing grinding process, abrasive paper with different mesh numbers for grinding the bearing does not need to be replaced, the bearing grinding effect can be achieved at a time, and the grinding efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of nodular cast iron bearing processing, and more specifically, to a special grinding device for nodular cast iron bearings. Background Art

[0002] Nodular cast iron has good comprehensive mechanical properties, including strength, toughness, wear resistance, and shock absorption, but its hardness is relatively low. After the production of nodular cast iron bearings, surface treatment is usually required to improve its wear resistance, corrosion resistance, and surface finish.

[0003] Due to the very high dimensional and shape accuracy requirements of the inner hole of the bearing, even a slight deviation will affect the performance and life of the bearing. Therefore, when using traditional grinding and polishing tools such as sand belts or polishing wheels to treat its inner surface, it is necessary to frequently replace sandpapers of different meshes and switch different grinding methods according to the grinding degree. This results in a large amount of operation time required for grinding the inner surface of the bearing, leading to low production efficiency. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a special grinding device for nodular cast iron bearings.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A special grinding device for nodular cast iron bearings includes a grinding frame. A plurality of electric guide rods are fixedly installed on the grinding frame, and a positioning ring is fixedly connected to the bottom of the plurality of electric guide rods. A grinding seat is also fixedly installed on the grinding frame. A positioning groove for cooperating with the fixed ring is opened on the grinding seat, and the positioning groove is used to place the bearing. A driving motor is fixedly arranged inside the grinding seat, and the output end of the driving motor is fixedly connected to a threaded rod. A circular cavity is opened inside the grinding seat, and a grinding unit is located in the circular cavity. The top of the threaded rod extends into the circular cavity, and the grinding unit is slidably arranged on the outer surface of the threaded rod. The grinding unit is used to grind the bearing. A top plate is thread sleeved on the outer surface of the threaded rod, and the top plate linearly rises through the thread on the surface of the threaded rod. The top plate is used to lift the grinding unit. The grinding unit is composed of a rough grinding component and a fine grinding component. A plurality of groups of sliding grooves are equidistantly opened on the top circumference of the outer surface of the threaded rod, and a slider is slidably arranged in each group of sliding grooves. The threaded rod drives the grinding unit to rotate through the slider.

[0007] Further, a one-way thread is opened on the outer surface of the threaded rod, and a reciprocating thread connected to the one-way thread is also opened on the outer surface of the threaded rod. The reciprocating thread is located above the one-way thread. The top plate is in threaded cooperation with the threaded rod. A plurality of groups of first telescopic rods are fixedly arranged on the bottom wall of the circular cavity, and the first telescopic rods are fixedly connected to the bottom of the top plate.

[0008] Further, the rough grinding assembly is used to remove burrs on the inner wall of the bearing. The rough grinding assembly includes a first sleeve slidably sleeved on the threaded rod. A plurality of groups of sliders are fixedly installed on the inner wall of the first sleeve. A reserved cavity is formed inside the first sleeve, and the reserved cavity extends downward and communicates with the circular cavity. The outer surface of the first sleeve is attached with sandpaper. A plurality of spiral grooves are formed inside the first sleeve. A plurality of small holes are formed on the surface of the sandpaper, and the small holes communicate with the spiral grooves. The spiral grooves are used to allow air to flow from bottom to top.

[0009] Further, the fine grinding assembly is used to polish the inner wall of the bearing. The fine grinding assembly includes a second sleeve fixedly connected to the first sleeve. The upper end of the outer surface of the second sleeve is attached with sandpaper, and the lower end of the outer surface of the second sleeve is attached with a sponge.

[0010] Further, the bottom of the first sleeve is made of hard rubber, and an air pressure cavity is formed inside the hard rubber. A corrugated pipe is sleeved on the outer surface of the threaded rod. The bottom of the corrugated pipe is communicated with a pipe, and the corrugated pipe is communicated with the air pressure cavity through the pipe. The top of the corrugated pipe is fixedly sleeved on the outer surface of the threaded rod, and the bottom of the corrugated pipe contacts the top of the first sleeve.

[0011] Further, an annular cavity is formed in the grinding base. A limiting groove in a ring shape is arranged at the bottom of the annular cavity. A fan group is rotatably arranged in the annular cavity. A limiting block is fixedly arranged at the bottom of the fan group, and the limiting block is slidably arranged in the limiting groove. A wind cylinder is fixedly sleeved on the outer surface of the fan group. Both the upper and lower ends of the spiral groove are communicated with a telescopic hard pipe, and the wind cylinder is communicated with the spiral groove through the telescopic hard pipe. The wind cylinder is located below the spiral groove. A collecting box is also fixedly sleeved on the outer surface of the threaded rod, and the collecting box is located above the spiral groove. The collecting box is communicated with the spiral groove through the telescopic hard pipe.

[0012] Further, an extrusion disc is fixedly sleeved on the threaded rod. A pressure cavity is formed inside the extrusion disc. An annular airbag is arranged inside the pressure cavity. A plurality of groups of sliding holes communicating with the pressure cavity are formed on the outer surface of the pressure cavity. Each group of sliding holes is arranged in a ring shape. A first extrusion block is slidably and sealingly arranged in each group of sliding holes. One end of each first extrusion block close to the annular airbag is fixedly connected with a first thrust spring, and the end of the first thrust spring far from the first extrusion block is fixedly connected with the outer surface of the annular airbag.

[0013] Further, a retention cavity is formed in the inner wall of the lower end of the second sleeve. The retention cavity communicates with the air holes in the sponge. The annular airbag communicates with the retention cavity through a hose. A plurality of second telescopic rods are fixedly connected to the inner wall of the lower end of the second sleeve. The telescopic end of each group of second telescopic rods is fixedly connected to a second extrusion block. A slot is formed in the interior of each group of second extrusion blocks. The telescopic end of the second telescopic rod is fixedly connected to the inner wall of the slot. A second thrust spring is arranged in the slot. The second thrust spring is sleeved on the telescopic end of the second telescopic rod. One end of the second thrust spring is fixedly connected to the fixed end of the second telescopic rod, and the other end of the second thrust spring is fixedly connected to the outer surface of the second extrusion block.

[0014] Further, the plurality of second telescopic rods and second extrusion blocks cooperate with the first extrusion block. The annular airbag is in a fully inflated state in its initial state.

[0015] Further, the extrusion disc is located in the reserved cavity. Threads are provided at the bottom of the threaded rod. The extrusion disc is arranged between the chute and the threads on the threaded rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In this application, by providing a threaded rod, a driving motor, a top disc, a rough grinding assembly and a fine grinding assembly, when grinding the bearing, the driving motor is started to drive the threaded rod to rotate, realizing the up and down movement of the fine grinding assembly. Then, through the threads on the threaded rod, the rough grinding assembly and the fine grinding assembly work, enabling the inner surface of the bearing to be finely ground and polished. During the grinding process of the bearing, there is no need to replace sandpapers with different mesh numbers for grinding the bearing, and the grinding effect of the bearing can be achieved at one time, effectively improving the grinding efficiency. (2) In this application, by providing a fan group, a telescopic rigid pipe, sandpaper, small holes and spiral grooves, when the fan group works, outside air is inhaled into the spiral grooves through the telescopic rigid pipe, and the air flows in the spiral grooves. At the same time, the small holes on the sandpaper inhale the debris generated during grinding into the spiral grooves, and through the telescopic rigid pipe at the top of the spiral grooves, the debris generated on the inner wall of the bearing when the rough grinding assembly works is blown into the collection box, reducing the situation where the burr debris generated when the rough grinding assembly works remains on the inner wall of the bearing and cannot be removed in time, so that the burr debris is repeatedly ground by the sandpaper on the inner wall of the bearing, resulting in over-grinding of the inner wall of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic front view of the overall structure of the present invention; Figure 2 is a cross-sectional view of the overall internal structure of the present invention; Figure 3 is a side cross-sectional view of the grinding unit of the present invention; Figure 4 Schematic combination diagram of the structural fan group, limit block, air duct and telescopic rigid pipe of the present invention; Figure 5 Schematic combination diagram of the structural rough grinding unit and threaded rod of the present invention; Figure 6 Structure of the present invention Figure 2 Enlarged view of the structure at A in Figure 7 Internal structure sectional view of the structural extrusion disc of the present invention; Figure 8 Exploded view of the internal structure of the structural extrusion disc of the present invention; Figure 9 Internal structure sectional view of the structural second extrusion block of the present invention.

[0018] Explanation of the reference numerals in the figure: 1. Grinding frame; 2. Electric guide rod; 3. Positioning ring; 4. Grinding seat; 5. Positioning groove; 6. Driving motor; 7. Threaded rod; 8. Circular cavity; 9. Grinding unit; 10. Top disc; 11. Rough grinding assembly; 12. Fine grinding assembly; 13. Slide groove; 14. Slide block; 15. First telescopic rod; 16. First sleeve; 17. Reserved cavity; 18. Sandpaper; 19. Spiral groove; 20. Small hole; 21. Second sleeve; 22. Sponge; 23. Hard rubber; 24. Air pressure cavity; 25. Bellows; 26. Pipe; 27. Ring cavity; 28. Limit groove; 29. Fan group; 30. Limit block; 31. Air duct; 32. Telescopic rigid pipe; 33. Collection box; 34. Extrusion disc; 35. Pressure cavity; 36. Annular airbag; 37. Slide hole; 38. First extrusion block; 39. First thrust spring; 40. Retention cavity; 41. Hose; 42. Second telescopic rod; 43. Second extrusion block; 44. Slot hole; 45. Second thrust spring. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1 to 9, A special grinding device for ductile iron bearings, comprising a grinding frame 1, on which a plurality of electric guide rods 2 are fixedly installed. The bottom of the plurality of electric guide rods 2 is fixedly connected to a positioning ring 3. A grinding seat 4 is also fixedly installed on the grinding frame 1. A positioning groove 5 for cooperating with the fixed ring is provided on the grinding seat 4. The positioning groove 5 is used to place the bearing. A driving motor 6 is fixedly arranged inside the grinding seat 4. The output end of the driving motor 6 is fixedly connected to a threaded rod 7. A circular cavity 8 is provided inside the grinding seat 4. A grinding unit 9 is located inside the circular cavity 8. The top of the threaded rod 7 extends into the circular cavity 8 and the grinding unit 9 is slidably arranged on the outer surface thereof. The grinding unit 9 is used to grind the bearing. A top plate 10 is threadedly sleeved on the outer surface of the threaded rod 7. The top plate 10 rises linearly through the thread on the surface of the threaded rod 7. The top plate 10 is used to lift the grinding unit 9. The grinding unit 9 is composed of a rough grinding component 11 and a fine grinding component 12. A plurality of sliding grooves 13 are equidistantly arranged in a circular pattern at the top of the outer surface of the threaded rod 7. A slider 14 is slidably arranged in each group of sliding grooves 13. The threaded rod 7 drives the grinding unit 9 to rotate through the slider 14.

[0021] A one-way thread is provided on the outer surface of the threaded rod 7, and a reciprocating thread connected to the one-way thread is also provided on the outer surface of the threaded rod 7. The reciprocating thread is located above the one-way thread. The top plate 10 is in threaded cooperation with the threaded rod 7. A plurality of first telescopic rods 15 are fixedly arranged on the bottom wall of the circular cavity 8. The first telescopic rods 15 are fixedly connected to the bottom of the top plate 10.

[0022] When it is necessary to grind the bearing, first place the bearing on the grinding seat 4 according to the position of the positioning groove 5. Subsequently, start the electric guide rods 2 to work through an external control console, so that the plurality of electric guide rods 2 extend to push the positioning ring 3 downward, thereby achieving the purpose of fixing the bearing on the grinding seat 4 by the positioning ring 3. Then, make the driving motor 6 rotate through the console, so that the threaded rod 7 rotates. Due to the one-way thread on the threaded rod 7 and at the same time due to the limiting effect of the plurality of first telescopic rods 15 on the top plate 10, at this time the top plate 10 will move upward from bottom to top, and then push the entire grinding unit 9 upward. Due to the limiting effect of the sliding grooves 13 on the sliders 14, at this time the threaded rod 7 will drive the grinding unit 9 to rotate and move upward at the same time. First, under the action of the one-way thread of the threaded rod 7, the rough grinding component 11 will grind off the burrs on the inner surface of the bearing. Then, as the top plate 10 moves upward, when the position of the top plate 10 moves to the position of the reciprocating thread on the threaded rod 7, at this time the top plate 10 will move up and down repeatedly under the action of the reciprocating thread on the threaded rod 7, thereby realizing the up and down movement of the fine grinding component 12, and being able to finely grind and polish the inner surface of the bearing. During the process of grinding the bearing, there is no need to replace sandpapers 18 with different meshes for grinding the bearing, and the effect of grinding the bearing can be achieved at one time, effectively improving the grinding efficiency; It should be specifically noted here that the top plate 10 is in contact with the entire grinding unit 9, and both the drive motor 6 and the electric guide rod 2 are electrically connected to the grinding frame 1, and the grinding frame 1 is electrically connected to an external power supply and an external console; Compared with common gray cast iron bearings, ductile iron bearings have better strength, toughness and plasticity. However, their own hardness is relatively low compared with gray cast iron bearings, and they cannot be ground by high-speed grinding. High-speed grinding will generate a large amount of heat. For ductile iron bearings, if this part of the heat is not taken away in time, the grinding surface will deform, which will affect the ductile iron bearings. Therefore, the grinding method of ductile iron bearings in this equipment adopts low-speed grinding; Moreover, since the hardness of ductile iron bearings is relatively soft compared with gray cast iron bearings, if a harder cutting material is used during grinding, more heat will be generated during cutting due to the large hardness of the cutting material. Therefore, a softer grinding material can be used. Therefore, sandpaper 18 is used for grinding in this equipment to reduce the heat generated during rough grinding.

[0023] As Figures 2 to 5 shown, the rough grinding assembly 11 is used to remove the burrs on the inner wall of the bearing. The rough grinding assembly 11 includes a first sleeve 16 slidably sleeved on the threaded rod 7. A plurality of groups of sliders 14 are fixedly installed on the inner wall of the first sleeve 16. A reserved cavity 17 is opened inside the first sleeve 16. The reserved cavity 17 extends downward and communicates with the circular cavity 8. The outer surface of the first sleeve 16 is attached with sandpaper 18. A plurality of groups of spiral grooves 19 are opened inside the first sleeve 16. A plurality of groups of small holes 20 are opened on the surface of the sandpaper 18. The small holes 20 communicate with the spiral grooves 19. The spiral grooves 19 are used to circulate air from bottom to top.

[0024] An annular cavity 27 is opened in the grinding seat 4. A circular limiting groove 28 is provided at the bottom of the annular cavity 27. A fan group 29 is rotatably arranged in the annular cavity 27. A limiting block 30 is fixedly arranged at the bottom of the fan group 29. The limiting block 30 is slidably arranged in the limiting groove 28. A wind cylinder 31 is fixedly sleeved on the outer surface of the fan group 29. Both the upper and lower ends of the spiral groove 19 are communicated with a telescopic hard tube 32. The wind cylinder 31 is communicated with the spiral groove 19 through the telescopic hard tube 32. The wind cylinder 31 is located below the spiral groove 19. A collection box 33 is also fixedly sleeved on the outer surface of the threaded rod 7. The collection box 33 is located above the spiral groove 19. The collection box 33 is communicated with the spiral groove 19 through the telescopic hard tube 32.

[0025] When the rough grinding assembly 11 starts to work, at this time, the fan group 29 is made to work through an external console, sucking external air into the air duct 31 of the annular cavity 27 and introducing it into the spiral groove 19 through the telescopic rigid pipe 32. When the air flows in the spiral groove 19, the debris generated during grinding will be sucked into the spiral groove 19 through the small holes 20 on the sandpaper 18, and through the telescopic rigid pipe 32 at the top of the spiral groove 19, the debris generated on the inner wall of the bearing during the operation of the rough grinding assembly 11 will be blown into the collection box 33, reducing the burr debris generated during the operation of the rough grinding assembly 11 remaining on the inner wall of the bearing and not being removed in time, thus avoiding the burr debris being repeatedly ground by the sandpaper 18 on the inner wall of the bearing, and further preventing the situation of excessive grinding of the inner wall of the bearing; At the same time, the heat generated when the rough grinding assembly 11 grinds the inner wall of the bearing will be taken away under the action of the air flowing in the spiral groove 19. Due to the design of the spiral groove 19, the spiral groove 19 for air circulation can communicate with the small holes 20 on the surface of the sandpaper 18, thereby taking away the heat generated during the grinding of the rough grinding assembly 11. Compared with the straight groove for heat dissipation, the spiral shape can effectively guide the gas to form a spiral flow in the groove. This flow pattern is more disordered than the straight flow, which can enhance the turbulence degree of the air, thereby increasing the convective heat transfer coefficient, better taking away the heat, improving the heat dissipation effect during the grinding of the rough grinding assembly 11, and ensuring the production quality of the bearing after being processed by the grinding unit 9; It should be specifically noted here that: the fan group 29 is composed of multiple groups of fans. The bottom of the fan is a motor, the bottom of the motor is fixedly connected to the limit block 30, the output end of the motor is fixedly connected to the fan blade, the motor is electrically connected to the external console, and a rotating rod is fixedly arranged in the center of the fan blade and extends upward. A connecting block is fixedly sleeved on the inner wall of the air duct 31, and the center of the connecting block is rotatably connected to the rotating rod. An air pipe for air intake is provided on the outer wall of the grinding seat 4, and the air pipe communicates with the annular cavity 27. The blowing direction of the fan is from bottom to top.

[0026] As Figure 2 and Figure 3 shown, the fine grinding assembly 12 is used for polishing the inner wall of the bearing. The fine grinding assembly 12 includes a second sleeve 21 fixedly connected to the first sleeve 16. The upper end of the outer surface of the second sleeve 21 is pasted with sandpaper 18, and the lower end of the outer surface of the second sleeve 21 is pasted with a sponge 22.

[0027] The driving motor 6 operates to drive the threaded rod 7 to rotate. The threaded rod 7 makes the top plate 10 perform a reciprocating motion of first moving upward and then moving downward through the reciprocating thread on its surface. The entire grinding unit 9 will be supported by the top plate 10 and perform the same motion as the top plate 10. First, when the part of the second sleeve 21 with the sandpaper 18 attached to its surface contacts the inner wall of the bearing, the fine grinding assembly 12 starts to perform fine grinding and polishing on the bearing. At this time, the small particle dust generated by the grinding and polishing of the bearing will adhere to the grinding surface of the bearing. If the grinding is continued repeatedly, it will affect the polishing effect of the bearing. Therefore, after the sandpaper 18 polishes the bearing, the second sleeve 21 continues to move upward, so that the part of its outer surface with the sponge 22 attached contacts and fits the grinding surface of the bearing, and then the second sleeve 21 starts to move downward. At this time, the sponge 22 that fits the grinding surface of the bearing will also move downward and separate from the grinding surface of the bearing. In this process, the sponge 22 will wipe off the small particle dust generated by the grinding and polishing of the inner surface of the bearing, reducing the impact on the polishing surface of the bearing during the next polishing and grinding, and further ensuring the production quality of the bearing processed by the grinding unit 9; It should be particularly noted here that: compared with the fine grinding and polishing operation, during rough grinding, due to the larger burrs, a greater cutting force is required during grinding than during fine grinding, so more heat is generated and heat dissipation treatment is required. The fine grinding operation of this equipment adopts the method of wiping after repeated grinding and polishing, so that the bearing will have time for natural heat dissipation of the polishing surface after each grinding and polishing. At the same time, since the driving motor 6 rotates at a low speed, less heat is generated during grinding and polishing, so the same heat dissipation method as in the rough grinding assembly 11 is not set here; The mesh number of the sandpaper 18 attached to the second sleeve 21 is larger than the mesh number of the sandpaper 18 attached to the first sleeve 16.

[0028] Such as Figure 2 、 Figure 3 and Figure 4 As shown in the figure, the bottom of the first sleeve 16 is made of hard rubber 23, and an air pressure chamber 24 is provided inside the hard rubber 23. A corrugated pipe 25 is sleeved on the outer surface of the threaded rod 7. The bottom of the corrugated pipe 25 is connected to a pipe 26. The corrugated pipe 25 is connected to the air pressure chamber 24 through the pipe 26. The top of the corrugated pipe 25 is fixedly sleeved on the outer surface of the threaded rod 7, and the bottom of the corrugated pipe 25 contacts the top of the first sleeve 16.

[0029] When the rough grinding assembly 11 works and moves upward while being supported by the tray, under the extrusion of the rough grinding assembly 11, the corrugated pipe 25 starts to contract. The corrugated pipe 25 squeezes the internal gas into the air pressure chamber 24 through the pipe 26, causing the hard rubber 23 to start to expand, and then making the sandpaper 18 attached to the surface of the hard rubber 23 closer to the grinding surface of the bearing, increasing the grinding force, so as to compensate for the size of the burr part ground off from the grinding surface of the bearing and ensure that the rough grinding assembly 11 can always fit the grinding surface of the bearing for burr grinding operation.

[0030] As Figure 2 , Figure 3 , Figures 7 to 9 shown, an extrusion disc 34 is fixedly sleeved on the threaded rod 7. A pressure chamber 35 is formed inside the extrusion disc 34. An annular airbag 36 is arranged inside the pressure chamber 35. A plurality of groups of sliding holes 37 communicating with the pressure chamber 35 are formed on the outer surface of the pressure chamber 35. Each group of sliding holes 37 is arranged in a ring shape. A first extrusion block 38 is slidably and sealingly arranged in each group of sliding holes 37. One end of each group of first extrusion blocks 38 close to the annular airbag 36 is fixedly connected with a first thrust spring 39. The end of the first thrust spring 39 away from the first extrusion block 38 is fixedly connected with the outer surface of the annular airbag 36.

[0031] A retention chamber 40 is formed on the inner wall at the lower end of the second sleeve 21. The retention chamber 40 communicates with the air holes on the sponge 22. The annular airbag 36 communicates with the retention chamber 40 through a hose 41. A plurality of groups of second telescopic rods 42 are fixedly connected to the inner wall at the lower end of the second sleeve 21. The telescopic ends of each group of second telescopic rods 42 are fixedly connected with a second extrusion block 43. A slot hole 44 is formed inside each group of second extrusion blocks 43. The telescopic end of the second telescopic rod 42 is fixedly connected with the inner wall of the slot hole 44. A second thrust spring 45 is arranged in the slot hole 44. The second thrust spring 45 is sleeved on the telescopic end of the second telescopic rod 42. One end of the second thrust spring 45 is fixedly connected with the fixed end of the second telescopic rod 42. The other end of the second thrust spring 45 is fixedly connected with the outer surface of the second extrusion block 43.

[0032] The plurality of groups of second telescopic rods 42 and second extrusion blocks 43 are used in cooperation with the first extrusion block 38. The annular airbag 36 is in a fully inflated state in its initial state.

[0033] The extrusion disc 34 is located in the reserved chamber 17. The bottom of the threaded rod 7 is provided with threads. The extrusion disc 34 is arranged between the sliding groove 13 and the threads on the threaded rod 7.

[0034] When the second extrusion block 43 contacts the first extrusion block 38, at this time, under the action of the second thrust spring 45, the second extrusion block 43 starts to extrude the first extrusion block 38, causing the first extrusion block 38 to slide in the slot hole 44 and enter the pressure chamber 35. At the same time, the first thrust spring 39 is compressed. Further, the first extrusion block 38 extrudes the annular airbag 36 in the pressure chamber 35. The annular airbag 36 contracts and sends the internal gas into the retention chamber 40 through the hose 41. At this time, the gas inside the retention chamber 40 will be ejected through the air holes on the sponge 22; When the second extrusion block 43 moves away from the first extrusion block 38, the first extrusion block 38 is not squeezed by the second extrusion block 43, and the first thrust spring 39 in the compressed state rebounds, so that the first extrusion block 38 slides in the slot 44 away from the pressure chamber 35, thereby expanding the annular airbag 36. At this time, the annular airbag 36 will suck the gas in the retention chamber 40, and the retention chamber 40 will suck air through the pores on the sponge 22. When the driving motor 6 starts to rotate with the threaded rod 7, the top plate 10 moves the grinding unit 9 upward. First, when the multiple groups of second extrusion blocks 43 begin to approach the extrusion plate 34 from bottom to top, the rounded corners of the second extrusion blocks 43 begin to contact the rounded corners of the extrusion plate 34. At this time, the second extrusion blocks 43 are squeezed by the extrusion plate 34, the second telescopic rod 42 contracts, and the second thrust spring 45 is compressed. As the threaded rod 7 continues to rotate, the top plate 10 continues to move the grinding unit 9 upward. After the sandpaper 18 on the fine grinding assembly 12 has finished grinding and polishing the bearing, the sponge 22 begins to wipe the small particles of dust on the inner wall of the bearing. In this process, the second extrusion block 43 begins to move away from the first extrusion block 38, and the pores on the sponge 22 will adsorb the small particles of dust on the surface of the sponge 22, which can improve the cleanliness of the sponge 22 wiping the bearing grinding surface and ensure the grinding and polishing effect of the fine grinding assembly 12 on the bearing grinding surface. Then, under the action of the reciprocating thread on the threaded rod 7, the tray moves down to support the grinding unit 9 until the sandpaper 18 on the fine grinding assembly 12 is completely attached to the inner wall of the bearing. At this time, the second extrusion block 43 contacts the first extrusion block 38, and the pores of the sponge 22 will spray gas to blow away the small particles of dust adsorbed on the sponge 22, so that these small particles of dust fall into the gap between the grinding unit 9 and the circular cavity 8, which can realize the self-cleaning of the sponge 22 and reduce the situation that the sponge 22 is stained with a lot of small particles of dust due to long-term use, and the small particles of dust are again attached to the bearing when wiping the grinding surface of the bearing, which affects the grinding and polishing effect of the bearing. It should be noted that: the elastic force of the first thrust spring 39 is smaller than the elastic force of the second thrust spring 45, the upper and lower ends of the extrusion plate 34 and the second extrusion block 43 are both rounded, and when the sandpaper 18 of the fine grinding assembly 12 partially contacts the grinding surface of the bearing, the height of the horizontal position of the plurality of groups of second extrusion blocks 43 is greater than the height of the horizontal position of the extrusion plate 34; There is a gap between the grinding unit 9 and the circular cavity 8. This gap can prevent the sandpaper 18 on the surface from contacting the inner wall of the circular cavity 8 when the hard rubber 23 expands. The function of this gap is also: when cleaning the equipment, a thin tube can be inserted into the gap to suck out the dust in it, so as to avoid excessive dust in the gap and the dust affecting the normal grinding of the bearing.

[0035] Usage: When the bearing needs to be polished, first place the bearing on the polishing seat 4 according to the position of the positioning groove 5, then start the electric guide rod 2 through the external console, so that the positioning ring 3 fixes the bearing on the polishing seat 4, and then the driving motor 6 is driven by the console to rotate the threaded rod 7. Due to the one-way thread on the threaded rod 7 and the limiting effect of the multiple groups of first telescopic rods 15 on the top plate 10, the top plate 10 will move upward from bottom to top, and then push the entire polishing unit 9 to move upward. First, under the action of the one-way thread of the threaded rod 7, the coarse polishing component 11 will polish off the burrs on the inner surface of the bearing, and then as the top plate 10 moves upward, the top plate 10 will repeatedly move up and down under the action of the reciprocating thread on the threaded rod 7, thereby realizing the action of the fine polishing component 12 moving up and down, and the inner surface of the bearing can be finely polished and polished. In the process of polishing the bearing, there is no need to replace sandpaper 18 of different mesh sizes for polishing the bearing, and the effect of polishing the bearing can be achieved at one time, which effectively improves the polishing efficiency.

[0036] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A special grinding device for nodular cast iron bearings, comprising a grinding frame (1), characterized in that: A grinding base (4) is also fixedly installed on the grinding frame (1). A positioning groove (5) for cooperating with the fixed ring is formed in the grinding base (4). The positioning groove (5) is used for placing a bearing. A driving motor (6) is fixedly arranged inside the grinding base (4). The output end of the driving motor (6) is fixedly connected to a threaded rod (7). A circular cavity (8) is formed in the grinding base (4). The grinding unit (9) is located inside the circular cavity (8). The top of the threaded rod (7) extends into the circular cavity (8), and the grinding unit (9) is slidably arranged on the outer surface of the threaded rod (7). The grinding unit (9) is used for grinding the bearing. A top plate (10) is sleeved on the outer surface of the threaded rod (7) in a threaded manner. The top plate (10) linearly ascends through the thread on the surface of the threaded rod (7). The top plate (10) is used for lifting the grinding unit (9). The grinding unit (9) is composed of a rough grinding component (11) and a fine grinding component (12). A plurality of groups of sliding grooves (13) are equidistantly formed in the circumferential direction at the top of the outer surface of the threaded rod (7). A slider (14) is slidably arranged in each group of sliding grooves (13). The threaded rod (7) drives the grinding unit (9) to rotate through the slider (14).

2. The special grinding device for ductile iron bearings according to claim 1, characterized in that: A plurality of groups of electric guide rods (2) are fixedly installed on the grinding frame (1). The bottom of the plurality of groups of electric guide rods (2) is fixedly connected to a positioning ring (3). A one-way thread is formed on the outer surface of the threaded rod (7). A reciprocating thread connected to the one-way thread is also formed on the outer surface of the threaded rod (7). The reciprocating thread is located above the one-way thread. The top plate (10) is in threaded cooperation with the threaded rod (7). A plurality of groups of first telescopic rods (15) are fixedly arranged on the bottom wall of the circular cavity (8). The first telescopic rods (15) are fixedly connected to the bottom of the top plate (10).

3. A special grinding device for nodular cast iron bearings according to claim 2, characterized in that: The rough grinding component (11) is used for removing burrs on the inner wall of the bearing. The rough grinding component (11) includes a first sleeve (16) slidably sleeved on the threaded rod (7). A plurality of groups of sliders (14) are fixedly installed on the inner wall of the first sleeve (16). A reserved cavity (17) is formed inside the first sleeve (16). The reserved cavity (17) extends downward and communicates with the circular cavity (8). Sandpaper (18) is attached to the outer surface of the first sleeve (16). A plurality of groups of spiral grooves (19) are formed inside the first sleeve (16). A plurality of groups of small holes (20) are formed on the surface of the sandpaper (18). The small holes (20) communicate with the spiral grooves (19). The spiral grooves (19) are used for air to flow from bottom to top.

4. The special grinding device for ductile iron bearings according to claim 3, characterized in that: The fine grinding component (12) is used for polishing the inner wall of the bearing. The fine grinding component (12) includes a second sleeve (21) fixedly connected to the first sleeve (16). Sandpaper (18) is attached to the upper end of the outer surface of the second sleeve (21). A sponge (22) is attached to the lower end of the outer surface of the second sleeve (21).

5. A special grinding device for ductile iron bearings according to claim 4, characterized in that: The bottom of the first sleeve (16) is made of hard rubber (23), and an air pressure chamber (24) is provided inside the hard rubber (23). A corrugated pipe (25) is sleeved on the outer surface of the threaded rod (7). The bottom of the corrugated pipe (25) is communicated with a pipe (26). The corrugated pipe (25) is communicated with the air pressure chamber (24) through the pipe (26). The top of the corrugated pipe (25) is fixedly sleeved on the outer surface of the threaded rod (7). The bottom of the corrugated pipe (25) is in contact with the top of the first sleeve (16).

6. The special grinding device for ductile iron bearings according to claim 5, characterized in that: An annular cavity (27) is provided in the grinding seat (4). A circular limiting groove (28) is provided at the bottom of the annular cavity (27). A fan group (29) is rotatably provided in the annular cavity (27). A limiting block (30) is fixedly provided at the bottom of the fan group (29). The limiting block (30) is slidably provided in the limiting groove (28). A wind cylinder (31) is fixedly sleeved on the outer surface of the fan group (29). Both the upper and lower ends of the spiral groove (19) are communicated with a telescopic rigid pipe (32). The wind cylinder (31) is communicated with the spiral groove (19) through the telescopic rigid pipe (32). The wind cylinder (31) is located below the spiral groove (19). A collection box (33) is also fixedly sleeved on the outer surface of the threaded rod (7). The collection box (33) is located above the spiral groove (19). The collection box (33) is communicated with the spiral groove (19) through the telescopic rigid pipe (32).

7. A special grinding device for nodular cast iron bearings according to claim 6, characterized in that: An extrusion disc (34) is fixedly sleeved on the threaded rod (7). A pressure chamber (35) is provided inside the extrusion disc (34). An annular airbag (36) is provided inside the pressure chamber (35). A plurality of groups of sliding holes (37) communicated with the pressure chamber (35) are provided on the outer surface of the pressure chamber (35). Each group of sliding holes (37) is annularly arranged. A first extrusion block (38) is slidably and sealingly provided in each group of sliding holes (37). One end of each first extrusion block (38) close to the annular airbag (36) is fixedly connected with a first thrust spring (39). The end of the first thrust spring (39) away from the first extrusion block (38) is fixedly connected with the outer surface of the annular airbag (36).

8. A special grinding device for nodular cast iron bearings according to claim 7, characterized in that: A retention cavity (40) is formed in the inner wall at the lower end of the second sleeve (21). The retention cavity (40) communicates with the air holes in the sponge (22). The annular airbag (36) communicates with the retention cavity (40) through a hose (41). A plurality of groups of second telescopic rods (42) are fixedly connected to the inner wall at the lower end of the second sleeve (21). The telescopic end of each group of second telescopic rods (42) is fixedly connected to a second extrusion block (43). A slot hole (44) is formed in the interior of each group of second extrusion blocks (43). The telescopic end of the second telescopic rod (42) is fixedly connected to the inner wall of the slot hole (44). A second thrust spring (45) is arranged in the slot hole (44). The second thrust spring (45) is sleeved on the telescopic end of the second telescopic rod (42). One end of the second thrust spring (45) is fixedly connected to the fixed end of the second telescopic rod (42). The other end of the second thrust spring (45) is fixedly connected to the outer surface of the second extrusion block (43).

9. The special grinding device for nodular cast iron bearings according to claim 8, characterized in that: The plurality of groups of second telescopic rods (42) and second extrusion blocks (43) are used in cooperation with the first extrusion block (38). The annular airbag (36) is in a fully inflated state in its initial state.

10. A special grinding device for ductile iron bearings according to claim 9, characterized in that: The extrusion disc (34) is located in the reserved cavity (17). The bottom of the threaded rod (7) is threaded. The extrusion disc (34) is arranged between the sliding groove (13) and the thread on the threaded rod (7).

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