Load-bearing saddle girdle machining tool

Abstract

The invention belongs to the technical field of adapter machining tools, and discloses an adapter ring belt machining tool which comprises a machining box, a base arranged at the top of the machining box and a grinding assembly arranged on the machining box and used for grinding the ring belt face of an adapter workpiece. The four clamping plates are evenly distributed about the axis of the base, check blocks used for separating the two adapter workpieces are fixed to the side walls, close to each other, of the two oppositely-arranged clamping plates, and a moving mechanism used for driving the four clamping plates to be close to or away from the axis of the base at the same time is arranged on the base. According to the device, by arranging the moving mechanism, the four clamping plates get close to or away from the axis of the base, so that the adapter workpiece is clamped or loosened, the operation that a plurality of bolts are tediously screwed for fixing or loosening in the prior art is omitted, and the grinding efficiency of the adapter workpiece is improved.

Description

Technical Field

[0001] The invention relates to the technical field of load-bearing saddle processing tooling, and in particular to a load-bearing saddle ring belt processing tooling. Background Art

[0002] The load saddle for bogie is a key component of the bogie part of railway freight cars and plays a vital role in driving safety. The arc surface on the load saddle is called the annular surface or the belt surface. The annular surface of the load saddle is in contact with the bearing, and its assembly size is more critical, which directly affects the assembly quality and performance between the load saddle, axle and bearing. The load saddle is usually cast, and the annular surface of the roughly formed load saddle is relatively rough, and usually a grinding machine is required to grind the rough parts. During the grinding process, the load saddle needs to be clamped first.

[0003] The Chinese utility model patent with publication number CN216633425U discloses a positioning processing fixture for processing the annular surface of a load-bearing saddle belt, comprising: a disc base, a square frame base, a pad, a first adjusting bolt and a second adjusting bolt. The square frame base is arranged on the disc base, and the frame base comprises a support frame, a first threaded hole, a second threaded hole, and a T-shaped plug plate. The first threaded hole is arranged on the left side of the support frame, and the second threaded hole is arranged on the upper and lower sides of the support frame. The T-shaped plug plate is fixedly arranged on the right side of the support frame, and the T-shaped plug plate is movably arranged on the left side of the support frame. The first adjusting bolt passes through the first threaded hole to press the T-shaped plug plate on the left side to adjust the left and right stroke of the T-shaped plug plate on the left side. The pads are respectively arranged on the upper and lower sides of the support frame, and the second adjusting bolt passes through the second threaded hole to press the pads on the upper and lower sides to adjust the up and down stroke of the pads on the upper and lower sides.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when using the positioning and processing fixture for the annular surface of the above-mentioned load-bearing saddle, the staff first needs to loosen the first adjusting bolt and the second adjusting bolt before placing the load-bearing saddle to be polished into the square frame base, and then re-tighten the first adjusting bolt and the second adjusting bolt to fix the load-bearing saddle to be polished. Among them, there are four second adjusting bolts and two first adjusting bolts. The entire process of clamping the load-bearing saddle requires frequent loosening or tightening of multiple bolts, which is cumbersome to operate and is not conducive to improving the grinding efficiency of the load-bearing saddle. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a load-bearing saddle ring belt processing tool.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a load-bearing saddle ring belt processing tool, including a processing box, a base arranged on the top of the processing box, and a grinding assembly arranged on the processing box and used to grind the ring belt surface of the load-bearing saddle workpiece, a clamping plate is arranged on the top of the base, and the clamping plates are provided with four and evenly distributed about the axis of the base, wherein two relatively arranged clamping plates are fixed with adjacent side walls with blocks for separating the two load-bearing saddle workpieces, and the base is provided with a moving mechanism for driving the four clamping plates to approach or move away from the axis of the base at the same time.

[0007] By adopting the above technical scheme, after the grinding assembly completes grinding the annular surface of the bearing saddle workpiece, the staff drives the four clamping plates to move simultaneously in the direction away from the axis of the base by controlling the moving mechanism, thereby achieving the purpose of loosening the bearing saddle workpiece. Subsequently, the staff takes out the polished bearing plate workpiece, and places the bearing plate workpiece to be polished into a position on the top of the base between the four clamping plates, and controls the moving mechanism to drive the four clamping plates to move simultaneously in the direction away from the axis close to the base, thereby achieving the purpose of clamping the bearing plate workpiece, eliminating the cumbersome operation of screwing multiple bolts for fixing or loosening in the prior art, which is beneficial to improving the grinding efficiency of the bearing saddle workpiece.

[0008] Furthermore, the moving mechanism includes a transmission assembly, the number of groups of the transmission assembly is the same as the number of clamping plates and the positions correspond one to one, the transmission assembly includes a U-shaped seat fixed to the top of the base, a threaded rod rotatably installed on the side wall of the U-shaped seat close to the clamping plate, an L-shaped connecting plate fixed to the side wall of the clamping plate away from the axis of the base, a driven bevel gear fixedly sleeved on the end of the threaded rod away from the clamping plate, and a guide rod fixed between the plate bodies on both sides of the U-shaped seat, the threaded rod penetrates the side wall of the U-shaped seat away from the clamping plate and is rotatably connected, the threaded rod penetrates the vertical section of the L-shaped connecting plate and is threadedly connected, the guide rod penetrates the vertical section of the L-shaped connecting plate and is slidably fitted, and the moving mechanism also includes a driving assembly for driving the four driven bevel gears to rotate simultaneously.

[0009] By adopting the above technical solution, the staff drives the four driven bevel gears to rotate simultaneously by adjusting the driving assembly, thereby causing the threaded rod fixed to the four driven bevel gears to rotate. Due to the limiting effect of the guide rod, the L-shaped connecting plate threadedly connected to the threaded rod and the clamping plate fixed to the L-shaped connecting plate are moved closer to or away from the load-bearing saddle workpiece, thereby achieving the purpose of clamping or loosening the load-bearing saddle workpiece for subsequent grinding work.

[0010] Furthermore, the driving assembly includes an active bevel gear that rotates on the top of the base and meshes with the four driven bevel gears. A mounting through hole is provided on the active bevel gear. The U-shaped seat is located between the inner wall of the mounting through hole and the clamping plate. The driving assembly also includes an operating rod fixed on the outer wall of the active bevel gear.

[0011] By adopting the above technical solution, the staff pushes the operating rod to make a circular motion along the axis of the base, so that the active bevel gear fixed to the operating rod and the active bevel gear meshing with the active bevel gear both rotate, thereby making the four clamping plates approach or move away from the axis of the base, so as to clamp or release the bearing saddle workpiece.

[0012] Furthermore, a protective shell is fixed on the base and is arranged around the top of the base and is used to protect the moving mechanism. A placement through hole is arranged through the top of the protective shell and is used to place the bearing saddle workpiece in the protective shell.

[0013] By adopting the above technical solution and setting up the protective shell, the probability of debris generated during the grinding of the bearing saddle workpiece splashing onto the active bevel gear, the driven bevel gear and other components is reduced, thereby affecting the normal meshing and transmission between the driven bevel gear and the active bevel gear.

[0014] Furthermore, a through opening is provided through the side wall of the protective shell, and one end of the operating rod away from the active bevel gear passes through the through opening. A limit plate is rotatably provided on the protective shell, and a groove is provided on the limit plate for engaging with the operating rod when the clamping plate clamps the bearing saddle workpiece.

[0015] By adopting the above technical solution, the setting of the limit plate and the slot plays a limiting role on the operating rod when the clamping plate clamps the load-bearing saddle workpiece, ensuring the stability of the clamping plate when clamping the load-bearing saddle workpiece.

[0016] Furthermore, a pair of arc shells are fixed on the side walls of the protective shell, and the two arc shells arranged in pairs are symmetrically distributed on both sides of the opening. The protective shell is provided with an arc baffle slidably installed between the inner wall of the arc shell and the outer wall of the protective shell, the arc length of the arc baffle is greater than the arc length of the opening, and the operating rod passes through the arc baffle and is fixedly connected.

[0017] Furthermore, the axis of the arc baffle, the axis of the arc shell and the axis of the protective shell all coincide with each other, and the limit plate is rotatably mounted on the side wall of the arc shell close to the operating rod.

[0018] By adopting the above technical solution, it is ensured that the arc baffle can slide normally between the inner wall of the arc shell and the outer wall of the protective shell.

[0019] Furthermore, a receiving through hole fixed to the side wall of the base is provided through the top of the processing box, a collecting groove is opened at a position on the top of the base corresponding to the limiting through hole, and a chip removal through hole is provided through the bottom of the base and connected to a position of the inner bottom wall of the collecting groove close to the edge of the collecting groove. The inner bottom wall of the collecting groove is inclined, and the height of the inner bottom wall of the collecting groove close to the chip removal through hole is smaller than the height of the inner bottom wall of the collecting groove away from the chip removal through hole.

[0020] By adopting the above technical solution, after the carrier plate workpiece is taken out, the setting of the collecting groove and the chip removal through hole makes it easy for the grinding component to clean and discharge the debris generated after grinding the carrier plate workpiece, ensuring the normal progress of subsequent grinding work.

[0021] Furthermore, the grinding assembly includes a mounting bracket fixed to the top of the processing box, an electric push rod fixed to the mounting bracket, a driving motor fixed to the push rod end of the electric push rod, and a grinding wheel detachably connected to the output end of the driving motor, and the axis of the grinding wheel coincides with the axis of the base.

[0022] By adopting the above technical solution, the staff operates the push rod end of the electric push rod to extend or contract, so that the driving motor fixed to the push rod end of the electric push rod and the grinding wheel connected to the output end of the driving motor descend or rise. At the same time, the driving motor drives the grinding wheel to rotate after working, and the rotating grinding wheel grinds the annular surface of the supporting saddle workpiece to ensure the smoothness of the annular surface of the supporting saddle workpiece.

[0023] To sum up, the present invention has the following beneficial effects: in this application, the staff pushes the operating rod to make a circular motion along the axis of the base, so that the active bevel gear and the active bevel gear and the threaded rod can be rotated, so that the four clamping plates are close to or away from the axis of the base, so as to clamp or loosen the load-bearing saddle workpiece, eliminating the cumbersome operation of tightening multiple bolts for fixing or loosening in the prior art, which is beneficial to improving the grinding efficiency of the load-bearing saddle workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention for highlighting the clamping of a bearing saddle workpiece;

[0026] Figure 3 is a schematic diagram of the structure of the protective housing used to highlight the embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of an embodiment of the present invention for highlighting the loosening of the bearing saddle workpiece;

[0028] Figure 5is a schematic diagram of a cross-sectional structure for highlighting the interior of a protective housing according to an embodiment of the present invention;

[0029] Figure 6 yes Figure 5 Schematic diagram of the floor plan.

[0030] In the figure: 1. processing box; 2. base; 3. bearing saddle workpiece; 4. grinding assembly; 41. mounting frame; 42. electric push rod; 43. driving motor; 44. grinding wheel; 5. clamping plate; 6. block; 7. moving mechanism; 71. transmission assembly; 711. U-shaped seat; 712. threaded rod; 713. L-shaped connecting plate; 714. driven bevel gear; 715. guide rod; 72. driving assembly; 721. active bevel gear; 7211. mounting through hole; 722. operating rod; 8. protective shell; 9. placement through hole; 10. through port; 11. limit plate; 12. slot; 13. arc shell; 14. arc baffle; 15. collecting trough; 16. chip removal through hole. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0032] like Figure 1-6 As shown, the embodiment of the present application discloses a bearing saddle ring belt processing tool, including a processing box 1, a base 2, a grinding assembly 4 and a moving mechanism 7, wherein the base 2 is arranged on the top of the processing box 1. A clamping plate 5 is arranged on the top of the base 2, and four clamping plates 5 are arranged and evenly distributed about the axis of the base 2, wherein two oppositely arranged clamping plates 5 are fixed with a stopper 6 for separating two bearing saddle workpieces 3 on their adjacent side walls.

[0033] The grinding assembly 4 is arranged on the processing box 1 and is used to grind the annular surface of the bearing saddle workpiece 3. The grinding assembly 4 includes a mounting frame 41, an electric push rod 42, a driving motor 43 and a grinding wheel 44. The mounting frame 41 is fixed to the top of the processing box 1, and the electric push rod 42 is fixed to the top of the mounting frame 41. The push rod end of the electric push rod 42 passes through the mounting frame 41 and slides together, and the driving motor 43 is fixed to the push rod end of the electric push rod 42. The grinding wheel 44 is detachably connected to the output end of the driving motor 43, and the axis of the grinding wheel 44 coincides with the axis of the base 2. The bearing saddle workpiece 3 is provided with an annular surface, a bearing saddle top surface, a bearing saddle bottom surface and a bearing saddle seat.

[0034] The moving mechanism 7 is disposed on the top of the base 2 and is used to drive the four clamping plates 5 to move toward or away from the axis of the base 2 at the same time. The moving mechanism 7 includes a transmission assembly 71 and a drive assembly 72. The number of transmission assemblies 71 is the same as the number of clamping plates 5 and the positions correspond one to one.

[0035] The transmission assembly 71 includes a U-shaped seat 711, a threaded rod 712, an L-shaped connecting plate 713, a driven bevel gear 714 and a guide rod 715. The U-shaped seat 711 is fixed to the top of the base 2. The threaded rod 712 is rotatably mounted on the side wall of the U-shaped seat 711 close to the clamping plate 5, and the threaded rod 712 penetrates the side wall of the U-shaped seat 711 away from the clamping plate 5 and is rotatably connected. The L-shaped connecting plate 713 is fixed to the side wall of the clamping plate 5 away from the axis of the base 2, and the threaded rod 712 penetrates the vertical section of the L-shaped connecting plate 713 and is threadedly connected. The driven bevel gear 714 is fixedly sleeved on the end of the threaded rod 712 away from the clamping plate 5, and the guide rod 715 is fixed between the plate bodies on both sides of the U-shaped seat 711, and the guide rod 715 penetrates the vertical section of the L-shaped connecting plate 713 and is slidably matched.

[0036] The driving assembly 72 is used to drive the four driven bevel gears 714 to rotate simultaneously, and the driving assembly 72 includes a driving bevel gear 721 and an operating rod 722. The driving bevel gear 721 rotates on the top of the base 2 and meshes with the four driven bevel gears 714. The driving bevel gear 721 is provided with a mounting through hole 7211 coaxial with the driving bevel gear 721, and the axis of the mounting through hole 7211 coincides with the axis of the base 2. The U-shaped seat 711 is located between the inner wall of the mounting through hole 7211 and the clamping plate 5, and the operating rod 722 is fixed to the outer wall of the driving bevel gear 721.

[0037] The staff operates the push rod end of the electric push rod 42 to extend or retract, so that the driving motor 43 fixed to the push rod end of the electric push rod 42 and the grinding wheel 44 connected to the output end of the driving motor 43 are lowered or raised. At the same time, the driving motor 43 drives the grinding wheel 44 to rotate after working, and the rotating grinding wheel 44 grinds the annular surface of the bearing saddle workpiece 3 until the annular surface of the bearing saddle workpiece 3 is polished. The staff pushes the operating rod 722 to make a circular motion along the axis of the base 2, so that the active bevel gear 721 fixed to the operating rod 722, the active bevel gear 721 meshed with the active bevel gear 721, and the threaded rod 712 fixed to the four driven bevel gears 714 are all rotated. The limiting effect of 715 makes the L-shaped connecting plate 713 threadedly connected to the threaded rod 712 and the clamping plate 5 fixed to the L-shaped connecting plate 713 move away from the bearing saddle workpiece 3, thereby achieving the purpose of loosening the bearing saddle workpiece 3. Subsequently, the staff takes out the polished bearing plate workpiece and puts the bearing plate workpiece to be polished into the position between the four clamping plates 5 on the top of the base 2. The staff pushes the operating rod 722 to make a reverse circular motion along the axis of the base 2, which can make the clamping plate 5 approach the bearing saddle workpiece 3 and tighten it, thereby achieving the purpose of clamping the bearing plate workpiece, eliminating the cumbersome operation of screwing multiple bolts for fixing or loosening in the prior art, which is beneficial to improving the polishing efficiency of the bearing saddle workpiece 3.

[0038] A protective shell 8 is fixed on the base 2, which is arranged around the top of the base 2 and is used to protect the moving mechanism 7. A placement through hole 9 is provided on the top of the protective shell 8 for placing the bearing saddle workpiece 3 in the protective shell 8. A through hole 10 is provided on the side wall of the protective shell 8, and the end of the operating rod 722 away from the active bevel gear 721 passes through the through hole 10. The provision of the protective shell 8 reduces the probability of debris generated during the grinding of the bearing saddle workpiece 3 splashing onto the active bevel gear 721, the driven bevel gear 714 and other components, thereby affecting the probability of normal meshing and transmission between the driven bevel gear 714 and the active bevel gear 721.

[0039] A limit plate 11 is rotatably provided on the protective shell 8, and a slot 12 is provided on the limit plate 11 for engaging with the operating rod 722 when the clamping plate 5 clamps the load-bearing saddle workpiece 3. The setting of the limit plate 11 and the slot 12 limits the operating rod 722 when the clamping plate 5 clamps the load-bearing saddle workpiece 3, thereby ensuring the stability of the clamping plate 5 when clamping the load-bearing saddle workpiece 3.

[0040] The side walls of the protective shell 8 are fixed with arc shells 13 arranged in pairs, and the two arc shells 13 arranged in pairs are symmetrically distributed on both sides of the through opening 10. The protective shell 8 is provided with an arc baffle 14 slidably installed between the inner wall of the arc shell 13 and the outer wall of the protective shell 8. The arc length of the arc baffle 14 is greater than the arc length of the through opening 10, and the axis of the arc baffle 14, the axis of the arc shell 13 and the axis of the protective shell all coincide. The operating rod 722 passes through the arc baffle 14 and is fixedly connected, and the limit plate 11 is rotatably installed on the side wall of the arc shell 13 close to the operating rod 722. It ensures that the arc baffle 14 can slide normally between the inner wall of the arc shell 13 and the outer wall of the protective shell.

[0041] The top of the processing box 1 is provided with a receiving through hole (not shown in the figure) fixed to the side wall of the base 2, and a collecting groove 15 is provided at a position on the top of the base 2 corresponding to the limiting through hole. The bottom of the base 2 is provided with a chip removal through hole 16 connected to the inner bottom wall of the collecting groove 15 near the edge of the collecting groove 15. The inner bottom wall of the collecting groove 15 is inclined, and the height of the inner bottom wall of the collecting groove 15 near the chip removal through hole 16 is less than the height of the inner bottom wall of the collecting groove 15 away from the chip removal through hole 16. After the carrier plate workpiece is taken out, the setting of the collecting groove 15 and the chip removal through hole 16 facilitates the grinding assembly 4 to clean and discharge the debris generated after grinding the carrier plate workpiece, ensuring the normal progress of subsequent grinding work.

[0042] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A tool for processing a bearing saddle ring belt, comprising a processing box (1), a base (2) arranged on the top of the processing box (1), and a grinding assembly (4) arranged on the processing box (1) and used for grinding the ring belt surface of a bearing saddle workpiece (3), wherein: A clamping plate (5) is arranged on the top of the base (2), and four clamping plates (5) are arranged and evenly distributed about the axis of the base (2), wherein two adjacent side walls of two oppositely arranged clamping plates (5) are fixed with a stopper (6) for separating two bearing saddle workpieces (3), and a moving mechanism (7) for driving the four clamping plates (5) to move toward or away from the axis of the base (2) at the same time is arranged on the base (2).

2. The tooling for processing a bearing saddle ring belt according to claim 1 is characterized in that: The moving mechanism (7) comprises a transmission assembly (71), the number of the transmission assemblies (71) being the same as the number of the clamping plates (5) and the positions corresponding to each other, the transmission assembly (71) comprising a U-shaped seat (711) fixed to the top of the base (2), a threaded rod (712) rotatably mounted on a side wall of the U-shaped seat (711) close to the clamping plate (5), an L-shaped connecting plate (713) fixed to the side wall of the clamping plate (5) away from the axis of the base (2), and a driven rod (713) fixedly sleeved on an end of the threaded rod (712) away from the clamping plate (5). The movable mechanism (7) further comprises a bevel gear (714) and a guide rod (715) fixed between the plates on both sides of the U-shaped seat (711); the threaded rod (712) penetrates the side wall of the U-shaped seat (711) away from the clamping plate (5) and is rotatably connected; the threaded rod (712) penetrates the vertical section of the L-shaped connecting plate (713) and is threadedly connected; the guide rod (715) penetrates the vertical section of the L-shaped connecting plate (713) and is slidably matched; the moving mechanism (7) further comprises a driving assembly (72) for driving the four driven bevel gears (714) to rotate simultaneously.

3. A tooling for processing a load-bearing saddle ring according to claim 2, characterized in that: The driving assembly (72) comprises a driving bevel gear (721) which rotates on the top of the base (2) and meshes with four driven bevel gears (714); a mounting through hole (7211) is provided through the driving bevel gear (721); the U-shaped seat (711) is located between the inner wall of the mounting through hole (7211) and the clamping plate (5); and the driving assembly (72) further comprises an operating rod (722) fixed on the outer wall of the driving bevel gear (721).

4. A tool for processing a bearing saddle ring belt according to claim 3, characterized in that: A protective shell (8) is fixed on the base (2) and is arranged around the top of the base (2) and is used to protect the moving mechanism (7). A placement through hole (9) is provided through the top of the protective shell (8) and is used to place the bearing saddle workpiece (3) in the protective shell (8).

5. The tooling for processing a load-bearing saddle ring belt according to claim 4 is characterized in that: A through hole (10) is formed through the side wall of the protective shell (8); one end of the operating rod (722) away from the active bevel gear (721) passes through the through hole (10); a limit plate (11) is rotatably provided on the protective shell (8); and a slot (12) is provided on the limit plate (11) for engaging with the operating rod (722) when the clamping plate (5) clamps the bearing saddle workpiece (3).

6. The tooling for processing a load-bearing saddle ring belt according to claim 5 is characterized in that: A pair of arc outer shells (13) are fixed on the side wall of the protective shell (8), and the two arc outer shells (13) are symmetrically distributed on both sides of the opening (10). The protective shell (8) is provided with an arc baffle (14) slidably installed between the inner wall of the arc outer shell (13) and the outer wall of the protective shell (8), the arc length of the arc baffle (14) is greater than the arc length of the opening (10), and the operating rod (722) passes through the arc baffle (14) and is fixedly connected.

7. The tooling for processing a load-bearing saddle ring belt according to claim 6 is characterized in that: The axis of the arc baffle (14), the axis of the arc housing (13) and the axis of the protective housing all coincide with each other, and the limit plate (11) is rotatably mounted on the side wall of the arc housing (13) close to the operating rod (722).

8. The tooling for processing a load-bearing saddle ring belt according to claim 1 is characterized in that: The top of the processing box (1) is provided with a receiving through hole fixed to the side wall of the base (2); the top of the base (2) is provided with a collecting groove (15) at a position corresponding to the limiting through hole; the bottom of the base (2) is provided with a chip removal through hole (16) connected to the inner bottom wall of the collecting groove (15) near the edge of the collecting groove (15); the inner bottom wall of the collecting groove (15) is inclined, and the height of the inner bottom wall of the collecting groove (15) near the chip removal through hole (16) is smaller than the height of the inner bottom wall of the collecting groove (15) away from the chip removal through hole (16).

9. The tooling for processing a load-bearing saddle ring belt according to claim 1 is characterized in that: The grinding assembly (4) comprises a mounting frame (41) fixed to the top of the processing box (1), an electric push rod (42) fixed to the mounting frame (41), a driving motor (43) fixed to the push rod end of the electric push rod (42), and a grinding wheel (44) detachably connected to the output end of the driving motor (43), wherein the axis of the grinding wheel (44) coincides with the axis of the base (2).

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