A special grinding head for the web of a rail and its grinding method

Abstract

Provide a special grinding head for the rail web and its grinding method, including the special grinding head for the rail web; and the grinding method of the special grinding head for the rail web includes the following steps: on-line disassembly - installing the special grinding head for the rail web on a small straight grinder - profiling grinding with the special grinding head for the rail web - passing the inspection, reassembling the disassembled backing plate and connecting parts, and finishing the grinding; the special grinding head for the rail web is composed of a grinding head matrix and an abrasive layer; and it has a profiling grinding structure matching the designed contour shape of the rail web. The grinding operation of the present invention is convenient, has a low requirement for the skill level of technical workers, can realize on-line grinding of the rail web, and has higher grinding accuracy and efficiency at the same time; the grinding head has good durability and can be used repeatedly for a long time.

Description

Technical Field

[0001] The present invention belongs to the technical field of railway track grinding auxiliary equipment, and particularly relates to a special grinding head for rail web and a grinding method thereof. Background Art

[0002] The rail structure in the turnout area is special, the wheel-rail interaction force is complex, and fatigue cracks are likely to occur at the corners of the rail web. In severe cases, the rail components may even break. Grinding the corners of the rail web is one of the simplest and most effective measures to eliminate the generation or development of fatigue cracks.

[0003] At present, in the limited structural space of the turnout area, it is very difficult for conventional grinding equipment to carry out rounding treatment on the corners of the rail web when the rail components are in use. Especially in the turnout switch area and the frog area, it is impossible to carry out on-line rounding treatment on the corners of the rail web (as shown in Figure 1). It can only be ground after the rail components are disassembled from the track, and then reinstalled after grinding (as shown in Figure 2). The entire rectification and treatment time seriously exceeds the railway maintenance skylight time, and the rounded corners ground cannot accurately meet the design requirements, and the grinding efficiency is low.

[0004] It can be seen that the existing grinding tools and grinding methods cannot carry out grinding operations in a narrow space; at the same time, they cannot be used for on-line grinding of turnout rails and can only be ground after the turnout rails are disassembled from the track. Whether using a grinding wheel head, a small angle grinder, or a grinding wheel disc, the grinding process is affected by human factors such as the skill level of the operator. It is not easy to control the accuracy of the rounded corners, the roughness of the grinding surface, and the flatness of the grinding surface after grinding; and the grinding process takes a long time; due to the relatively hard material of the rail itself, whether it is a grinding wheel head or a grinding wheel disc, its service life is low and new grinding wheel heads or grinding wheel discs need to be frequently replaced. Therefore, the following technical solutions are proposed. Summary of the Invention

[0005] The technical problem solved by the present invention: Provide a special grinding head for rail web and a grinding method thereof, and solve the technical problem that the existing grinding tools cannot achieve efficient, accurate, and easy-to-operate on-line grinding of the rail web.

[0006] The technical solution adopted by the present invention: A grinding method for a special grinding head for rail web, including a special grinding head for rail web;

[0007] The profiling grinding structure has an upper arc section, a middle straight section, and a lower arc section from top to bottom; the radius of the upper arc section matches the upper arc of the rail web; the radius of the lower arc section matches the lower arc of the rail web; a middle straight section is arranged between the upper arc section and the lower arc section; the middle straight section makes the upper arc section and the lower arc section form a certain distance and angle, and profiles and fits the outer contour of the rail web;

[0008] The special grinding head for the rail web has a universal module that matches different rail types of rail webs and can be replaced; the universal module includes an upper arc segment module, a middle straight segment module, and a lower arc segment module; the upper arc segment module, the middle straight segment module, and the lower arc segment module are disassembled, replaced, and connected into one body with the grinding head base by means of threaded connection;

[0009] And the grinding method of the special grinding head for the rail web includes the following steps:

[0010] S1. Disassemble the pads and connectors in the grinding area of the turnout rail online, and reserve the grinding range of the turnout rail web;

[0011] S2. After installing the special grinding head for the rail web on a small straight grinder, make the middle straight segment area of the special grinding head for the rail web closely fit the vertical plane of the turnout rail web;

[0012] S3. Use the upper arc segment or the lower arc segment of the special grinding head for the rail web to grind the upper arc segment or the lower arc segment of the grinding position of the die-forged wing rail a rail web or the die-forged wing rail b rail web of the turnout rail;

[0013] S4. Use the upper arc segment or the lower arc segment of the special grinding head for the rail web to grind the upper arc segment or the lower arc segment of the grinding position of the die-forged wing rail a rail web or the die-forged wing rail b rail web of the turnout rail;

[0014] S5. Use a special contour sample block to detect the arc of the rail web edge after grinding;

[0015] S6. After passing the inspection, reassemble the disassembled pads and connectors, and the grinding is completed;

[0016] The special grinding head for the rail web is composed of a grinding head base with an integral structure and an abrasive layer located on the outer layer of the grinding head base; the special grinding head for the rail web has a profiling grinding structure that matches the designed contour shape of the rail web.

[0017] In the above technical solution, further: the assembly tool for installing the special grinding head for the rail web on the small straight grinder in step S2 is to use an open-end wrench in cooperation with a rotor snap ring for assembly; the rotor snap ring is used to limit the rotation of the rotor of the small straight grinder; the open-end wrench is used to turn the grinding head locking nut of the small straight grinder.

[0018] In the above technical solution, further: The rotor snap ring includes a rotor snap sleeve and a snap ring support I; the rotor snap sleeve includes a snap ring support II, a rotor groove, a left snap ring, a right snap ring, and a pin shaft; the center of the snap ring support II is vertically fixedly connected to the rotor groove; the rotor groove is clamped and fixedly connected to the handle of the small straight grinder; the left and right ends of the snap ring support II are respectively hinged to the left snap ring and the right snap ring through the pin shaft; the left snap ring and the right snap ring are L-shaped structures that are symmetrical left and right; the free ends of the left snap ring and the right snap ring are fixedly connected into one body through the pin shaft; and the rotor snap sleeve surrounds the handle of the small straight grinder and is fixedly connected to the handle of the small straight grinder into one body; the rotor snap sleeve is fixedly connected to the bottom end of the snap ring support I through the pin shaft; the snap ring support I is an L-shaped structure; the end of the L-shaped structure of the snap ring support I is a snap structure, and the rotor is clamped and adapted through the snap structure to prevent the rotor from rotating.

[0019] In the above technical solution, further: The special profile sample block in step S5 has a profile surface that is consistent with the designed profile of the rail web as the measurement reference surface, that is, the measurement reference surface includes an upper arc section, a middle straight section, and a lower arc section; the measurement is based on the qualification that each section is closely attached or the gap is uniform.

[0020] In the above technical solution, preferably: The grinding head base body is a metal base body, and the abrasive layer is diamond or nano-crystalline cubic boron nitride.

[0021] In the above technical solution, preferably: The material of the grinding head base body is 45 steel or high-quality carbon structural steel not lower than its performance, or T10 steel or carbon tool steel not lower than its performance.

[0022] In the above technical solution, further: The thickness of the abrasive layer is 0.5 - 3 mm; the diamond or nano-crystalline cubic boron nitride and the grinding head base body are made by electroplating coating method.

[0023] The present invention also claims to protect a special grinding head for rail web, including the special grinding head for rail web used in the grinding method of any one of the foregoing special grinding heads for rail web.

[0024] Advantages of the present invention compared with the prior art:

[0025] 1. For the special grinding head for rail web of the present invention, a small straight grinder is used to install the special grinding head, and the grinding profile of the special grinding head is consistent with the theoretical design profile of the rail web; the grinding operation is convenient, the skill level requirements for technical workers are relatively low, on-line grinding of the rail web can be realized, and at the same time, the grinding accuracy and efficiency are higher; the grinding head abrasive uses super-hard abrasive, has good durability, can be used repeatedly for a long time, and the grinding surface has high smoothness.

[0026] 2. The present invention uses a small straight grinder to install the special grinding head, and can realize the grinding of the rail web edges and corners without disassembling the turnout rail.

[0027] 3. The profile of the special grinding head of the present invention adopts an integrated design, with upper and lower arcs of different radii. A straight line segment is provided between the upper and lower arcs, so that there is a certain distance and angle between the upper and lower arcs. The integrated profile can be consistent with the theoretically designed profile of the rail limb, facilitating the grinding operation, requiring a lower skill level for technical workers, and having higher grinding accuracy at the same time.

[0028] 4. The profile of the special grinding head of the present invention adopts an integrated design. The upper and lower arcs of different radii of the integrated grinding head can be used to achieve grinding of different fillet radii of the upper and lower edges on the same rail limb with one grinding head, making the grinding more efficient.

[0029] 5. The grinding head base of the present invention is made of metal material, and a superhard abrasive layer is provided on the surface. The thickness of the superhard abrasive layer is 0.5 - 3 mm. The superhard abrasive layer uses diamond or nano-crystalline cubic boron nitride, with a long service life and effectively reducing the replacement frequency of the special grinding head. Description of the Drawings

[0030] Figures 1(a) - 1(c) are schematic diagrams of grinding the rail limb of the turnout rail;

[0031] Figures 2(a) - 2(b) are schematic diagrams of grinding by the conventional grinding method of the existing solution after the rail component is disassembled and removed from the track;

[0032] Figures 3(a) - 3(e) are schematic diagrams of the structure of the special grinding head for different rail type rail limbs of the present invention;

[0033] Figures 4(a) - 4(d) are schematic diagrams of the steps of the grinding method of the special grinding head for the rail limb of the present invention;

[0034] Figure 5 It is a flowchart of the method of the present invention;

[0035] Figures 6(a) - 6(f) are schematic diagrams of the structure of the assembly tool for the special grinding head of the rail limb of the present invention;

[0036] Figures 7(a) - 7(b) are schematic diagrams of detecting the special profile sample block of the present invention;

[0037] Figure 8 It is a schematic diagram of the modular replacement and assembly structure of the special grinding head for the rail limb of the present invention;

[0038] In the figure: 1 - Die - forged wing rail a; 2 - Die - forged wing rail b; 3 - Grinding position of the rail limb of die - forged wing rail a; 4 - Grinding position of the rail limb of die - forged wing rail b; 5 - Turnout rail; 6 - Small straight - type grinding machine; 601 - Rotor, 602 - Grinding head locking nut; 7 - Grinding wheel head; 8 - Small angle - type grinding machine; 9 - Grinding wheel disc; 10 - Special grinding head for rail limb; 11 - Grinding head base; 12 - Abrasive layer; 13 - Upper arc section, 14 - Middle straight section, 15 - Lower arc section; 16 - Special profile template; 17 - Upper arc section module, 18 - Middle straight section module, 19 - Lower arc section module, 20 - Open - ended wrench, 21 - Rotor snap ring. Detailed implementation manners

[0039] Next, in combination with the attached drawings 1 - 8 in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of 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 belong to the scope of protection of the present invention.

[0040] A grinding method for a special grinding head for rail limb, including the special grinding head 10 for rail limb; and the grinding method of the special grinding head 10 for rail limb includes the following steps:

[0041] (See Figure 5 ) Step S1: Disassemble the cushion plate and connecting parts in the grinding area of the turnout rail online, and reserve the grinding range of the rail limb of the turnout rail (combined with Figure 1). The disassembled cushion plate and connecting parts in the grinding area are placed near the rail and correspond one - to - one with the original positions to avoid confusion.

[0042] Step S2: After installing the special grinding head 10 for rail limb on the small straight - type grinding machine 6, make the middle straight section 14 area of the special grinding head 10 for rail limb be able to closely fit with the vertical plane of the rail limb of the turnout rail.

[0043] (As shown in Figure 6) In the above - mentioned step embodiment, further: The assembly tool for installing the special grinding head 10 for rail limb on the small straight - type grinding machine 6 in Step S2 is to use an open - ended wrench 20 in cooperation with a rotor snap ring 21 for assembly; the rotor snap ring 21 is used to limit the rotation of the rotor 601 of the small straight - type grinding machine 6. The open - ended wrench 20 is used to turn the grinding head locking nut 602 of the small straight - type grinding machine 6.

[0044] In the above-described step embodiments, further: To achieve the rotational restriction of the rotor 601 of the small straight grinder 6 by the rotor retaining ring 21: The rotor retaining ring 21 includes a rotor sleeve 211 and a retaining ring support I 212. The rotor sleeve 211 is used to fixedly connect the rotor retaining ring 21 to the small straight grinder 6. The retaining ring support I 212 is used to fixedly connect to the rotor 601 of the small straight grinder 6 to restrict the rotation of the rotor. Specifically: The rotor sleeve 211 includes a retaining ring support II 2111, a rotor slot 2112, a left retaining ring 2113, a right retaining ring 2114, and a plurality of pin shafts 2115.

[0045] Among them, the retaining ring support II 2111 is vertically and fixedly connected to the center of the rotor slot 2112; a slot is made at the end of the rotor slot 2112, and the slot is clamped and fixedly connected to the handle of the small straight grinder 6; thus, the rotor sleeve 211 and the handle of the small straight grinder 6 are fixedly connected as a whole. The left and right ends of the retaining ring support II 2111 are respectively hinged to the left retaining ring 2113 and the right retaining ring 2114 through the pin shafts 2115; the left retaining ring 2113 and the right retaining ring 2114 surround the handle of the small straight grinder 6. The left retaining ring 2113 and the right retaining ring 2114 are L-shaped structures that are symmetrical left and right; the free ends of the left retaining ring 2113 and the right retaining ring 2114 are fixedly connected as a whole through the pin shafts 2115 to form a square structure. The rotor sleeve 211 surrounds the handle of the small straight grinder 6 and is fixedly connected to the handle of the small straight grinder 6 through the rotor slot 2112. On this basis: The rotor sleeve 211 is fixedly connected to the bottom end of the retaining ring support I 212 through the pin shaft 2115; the retaining ring support I 212 is an L-shaped structure; a buckle structure is made at the end of the L-shaped structure of the retaining ring support I 212, and the buckle structure is clamped and adapted to the rotor 601 to prevent the rotation of the rotor 601; the buckle structure is also a slot structure.

[0046] Step S3: Use the upper arc section 13 or the lower arc section 15 of the special grinding head 10 for the rail web to grind the upper arc section or the lower arc section of the grinding position 3 of the a-rail web of the forging wing rail of the turnout rail or the grinding position 4 of the b-rail web of the forging wing rail.

[0047] Step S4: Use the upper arc section 13 or the lower arc section 15 of the special grinding head 10 for the rail web to grind the upper arc section or the lower arc section of the grinding position 3 of the a-rail web of the forging wing rail of the turnout rail or the grinding position 4 of the b-rail web of the forging wing rail.

[0048] In specific implementation, (as shown in Figure 4), steps S3 and S4 include the following processes: Use the upper arc section 13 of the special rail web grinding head 10 to grind the upper arc section of the grinding position 3 of the rail web of the forging wing rail a of the turnout rail. Then use the lower arc section 15 of the special rail web grinding head 10 to grind the lower arc section of the grinding position 3 of the rail web of the forging wing rail a of the turnout rail. Then use the upper arc section 13 of the special rail web grinding head 10 to grind the upper arc section of the grinding position 4 of the rail web of the forging wing rail b of the turnout rail. Use the lower arc section 15 of the special rail web grinding head 10 to grind the lower arc section of the grinding position 4 of the rail web of the forging wing rail b of the turnout rail.

[0049] Step S5: Use the corresponding special profile template 16 (as shown in Figure 7) to detect the rounded corners of the ground rail web.

[0050] In the above embodiment, further: The special profile template 16 in step S5 has a profile surface that is consistent with the designed profile of the rail web as the measurement reference surface, that is, the measurement reference surface includes an upper arc section, a middle straight section, and a lower arc section. When measuring, it is considered qualified based on close fitting or uniform gaps for each section. (As shown in Figures 7(a) and 7(b)).

[0051] Step S6: After passing the inspection, reassemble the disassembled base plate and connectors, and the grinding is completed.

[0052] (As shown in Figure 3) The special rail web grinding head 10 is composed of a grinding head base body 11 with an integral structure and an abrasive layer 12 located on the outer layer of the grinding head base body 11. The special rail web grinding head 10 has a profiling grinding structure that matches the designed profile shape of the rail web.

[0053] In the above embodiment, preferably: The grinding head base body 11 is a metal base body, and the abrasive layer 12 is diamond or nano-crystalline cubic boron nitride.

[0054] In the above embodiment, preferably: The material of the grinding head base body 11 is No. 45 steel or high-quality carbon structural steel not lower than its performance, or T10 steel or carbon tool steel not lower than its performance.

[0055] In the above embodiment, further: The thickness of the abrasive layer 12 is 0.5 - 3 mm; the diamond or nano-crystalline cubic boron nitride and the grinding head base body 11 are made by electroplating coating method.

[0056] In the above embodiment, preferably: (as shown in Figure 3) The profiling grinding structure has an upper arc section 13, a middle straight section 14, and a lower arc section 15 from top to bottom.

[0057] The radius of the upper arc segment 13 matches the upper arc of the rail web; the radius of the lower arc segment 15 matches the lower arc of the rail web; an intermediate straight segment 14 is provided between the upper arc segment 13 and the lower arc segment 15; the intermediate straight segment 14 forms a certain distance and angle between the upper arc segment 13 and the lower arc segment 15, and is shaped and adapted to fit the outer contour of the rail web.

[0058] Specifically, regarding the specific embodiments of the profiling grinding structure:

[0059] Embodiment 1: The radius of the upper arc segment 13 is R10 mm, the length of the intermediate straight segment 14 is 25 mm, and the angle with the upper and lower arc segments is 23°, and the radius of the lower arc segment 15 is R5 mm. It is applicable to the grinding of the rail web of the 60 kg / m die-forged wing rail. (As shown in Figure 3(b))

[0060] Embodiment 2: The radius of the upper arc segment 13 is R4 mm, the length of the intermediate straight segment 14 is 15 mm, and the angle with the upper and lower arc segments is 10° - 15°, preferably 12°; the radius of the lower arc segment 15 is R2 mm. It is applicable to the grinding of the rail web of the 60 kg / m standard rail. (As shown in Figure 3(c))

[0061] Embodiment 3: The radius of the upper arc segment 13 is R15 mm, the length of the intermediate straight segment 14 is 25 mm, and the angle with the upper and lower arc segments is 25° - 30°, preferably 30°; the radius of the lower arc segment 15 is R5 mm. It is applicable to the grinding of the rail web of the 60TY1 rolled wing rail. (As shown in Figure 3(d))

[0062] Embodiment 4: The radius of the upper arc segment 13 is R5 mm, the length of the intermediate straight segment 14 is 25 mm, and the angle with the upper and lower arc segments is 15° - 20°, preferably 15°; the radius of the lower arc segment 15 is R10 mm. It is applicable to the grinding of the rail web of the 60AT1 rail. (As shown in Figure 3(e))

[0063] In the above embodiments, further: The special grinding head 10 for the rail web has a universal module that matches and is replaceable with different rail types of rail webs; the universal module includes an upper arc segment module 17, an intermediate straight segment module 18, and a lower arc segment module 19; the upper arc segment module 17, the intermediate straight segment module 18, and the lower arc segment module 19 are detachably replaced and connected to the grinding head base 11 by means of threaded connection and integrated. (As Figure 8 shown)

[0064] The present invention also claims protection for a special grinding head for the rail web, including the special grinding head 10 for the rail web used in the grinding method of any one of the foregoing special grinding heads for the rail web.

[0065] It can be found from the above description that: The present invention uses a small straight grinding machine equipped with a special grinding head, and can realize the grinding of the rail web edges and corners without disassembling the turnout rails.

[0066] The profile of the special grinding head of the present invention adopts an integrated design, with upper and lower arcs of different radii. A straight line segment is provided between the upper and lower arcs, so that there is a certain distance and angle between the upper and lower arcs. The integrated profile can be consistent with the theoretical design profile of the rail limb, which is convenient for grinding operation, requires a lower skill level for technical workers, and has higher grinding accuracy at the same time.

[0067] The profile of the special grinding head of the present invention adopts an integrated design. The upper and lower arcs of different radii of the integrated grinding head can be used to realize grinding of different fillet radii of the upper and lower edges on the same rail limb with one grinding head, and the grinding is more efficient.

[0068] The grinding head base of the present invention is made of metal material, and a superhard abrasive layer is provided on the surface. The thickness of the superhard abrasive layer is 0.5-3 mm. The superhard abrasive layer is made of diamond or nano-crystalline cubic boron nitride, with a long service life and effectively reducing the replacement frequency of the special grinding head.

[0069] In summary: For the special grinding head of the rail of the present invention, a small straight grinder is used to install the special grinding head, and the grinding profile of the special grinding head is consistent with the theoretical design profile of the rail limb; the grinding operation is convenient, the skill level requirements for technical workers are low, and the on-line grinding of the rail limb can be realized, and at the same time, the grinding accuracy and efficiency are higher; the grinding head abrasive uses superhard abrasive, has good durability, can be used repeatedly for a long time, and the grinding surface has high smoothness.

[0070] Each embodiment in this specification is described in a related manner. For the same and similar parts between the embodiments, reference can be made to each other. The key points of each embodiment are the differences from other embodiments.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A grinding method for a special grinding head of a rail web, characterized in that: including a special grinding head (10) for the web of the rail; The special grinding head (10) for the web of the rail is composed of a grinding head base body (11) with an integral structure and an abrasive layer (12) located on the outer layer of the grinding head base body (11); the special grinding head (10) for the web of the rail has a profiling grinding structure matching the designed contour shape of the web of the rail; The profiling grinding structure has an upper arc section (13), a middle straight section (14), and a lower arc section (15) from top to bottom; the radius of the upper arc section (13) matches the upper arc of the web of the rail; the radius of the lower arc section (15) matches the lower arc of the web of the rail; a middle straight section (14) is arranged between the upper arc section (13) and the lower arc section (15); the middle straight section (14) makes the upper arc section (13) and the lower arc section (15) form a certain distance and angle, and the profiling fits the outer contour of the web of the rail; The special grinding head (10) for the web of the rail has a universal module that matches and is replaceable for different rail types of webs; the universal module includes an upper arc section module (17), a middle straight section module (18), and a lower arc section module (19); the upper arc section module (17), the middle straight section module (18), and the lower arc section module (19) are disassembled, replaced, and connected into one body with the grinding head base body (11) by means of threaded connection; And the grinding method of the special grinding head (10) for the web of the rail includes the following steps: S1. Disassemble the pads and connectors in the grinding area of the turnout rail online, and reserve the grinding range of the web of the turnout rail; S2. After installing the special grinding head (10) for the web of the rail on a small straight grinder (6), make the middle straight section area of the special grinding head (10) for the web of the rail closely fit the vertical plane of the web of the turnout rail; S3. Use the upper arc section (13) or the lower arc section (15) of the special grinding head (10) for the web of the rail to grind the upper arc section or the lower arc section of the grinding position (3) of the a-web of the die-forged wing rail or the grinding position (4) of the b-web of the die-forged wing rail of the turnout rail; S4. Use the upper arc section (13) or the lower arc section (15) of the special grinding head (10) for the web of the rail to grind the upper arc section or the lower arc section of the grinding position (3) of the a-web of the die-forged wing rail or the grinding position (4) of the b-web of the die-forged wing rail of the turnout rail; S5. Use a corresponding special profile sample block (16) to detect the arc of the corner of the ground web; S6. After the detection is qualified, reassemble the disassembled pads and connectors, and the grinding is completed.

2. The grinding method of the special grinding head for the rail web according to claim 1, characterized in that: The assembly tool for installing the special grinding head (10) for the web of the rail on the small straight grinder (6) in step S2 is to use an open-end wrench (20) in cooperation with a rotor retaining ring (21) for assembly; the rotor retaining ring (21) is used to limit the rotation of the rotor (601) of the small straight grinder (6); the open-end wrench (20) is used to turn the grinding head locking nut (602) of the small straight grinder (6).

3. The grinding method of the special grinding head for the rail web according to claim 2, characterized in that: The rotor snap ring (21) includes a rotor socket (211) and a snap ring vertical frame I (212); the rotor socket (211) includes a snap ring vertical frame II (2111), a rotor slot (2112), a left snap ring (2113), a right snap ring (2114), and a pin shaft (2115); the center of the snap ring vertical frame II (2111) is vertically and fixedly connected to the rotor slot (2112); the rotor slot (2112) is clamped and fixedly connected to the handle of the small straight grinder (6); the left and right ends of the snap ring vertical frame II (2111) are respectively hinged to the left snap ring (2113) and the right snap ring (2114) through the pin shaft (2115); the left snap ring (2113) and the right snap ring (2114) are L-shaped structures that are symmetrical left and right; the free ends of the left snap ring (2113) and the right snap ring (2114) are fixedly connected into one body through the pin shaft (2115); and the rotor socket (211) surrounds the handle of the small straight grinder (6) and is fixedly connected to the handle of the small straight grinder (6) into one body; the rotor socket (211) is fixedly connected to the bottom end of the snap ring vertical frame I (212) through the pin shaft (2115); the snap ring vertical frame I (212) is an L-shaped structure; the end of the L-shaped structure of the snap ring vertical frame I (212) is a snap structure, and the rotor (601) is clamped and adapted through the snap structure to prevent the rotor (601) from rotating.

4. The grinding method of the special grinding head for the rail web according to claim 1, characterized in that: The special profile sample block (16) described in step S5 has a profile surface that is consistent with the designed profile of the rail web as the measurement reference surface, that is, the measurement reference surface includes an upper arc segment, a middle straight segment, and a lower arc segment.

5. The grinding method of the special grinding head for the rail web according to claim 1, characterized in that: The grinding head base body (11) is a metal base body, and the abrasive layer (12) is diamond or nano-crystalline cubic boron nitride.

6. The grinding method of the special grinding head for the rail web according to claim 5, characterized in that: The material of the grinding head base body (11) is No. 45 steel or high-quality carbon structural steel not lower than its performance, or T10 steel or carbon tool steel not lower than its performance.

7. The grinding method of the special grinding head for the rail web according to claim 5, characterized in that: The thickness of the abrasive layer (12) is 0.5 - 3 mm; the diamond or nano-crystalline cubic boron nitride and the grinding head base body (11) are made by electroplating coating method.

8. A special grinding head for the rail web, characterized in that: It includes a special rail web grinding head (10) used in the grinding method of a special rail web grinding head as described in any one of claims 1 - 7.

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