A switch grinding apparatus and process

Abstract

The application discloses a kind of turnout polishing equipment and process, it is related to turnout polishing technical field, and polishing equipment includes the walking trolley that moves on two side tracks, and two sides on walking trolley are symmetrical and respectively arranged with the polishing mechanism for polishing track;Polishing mechanism includes polishing abrasive belt, further includes a group of driving wheels and two groups of driven wheels, a group of driving wheels and two groups of driven wheels are triangularly arranged, and polishing abrasive belt is sleeved on driving wheel and driven wheel, and the polishing abrasive belt between two groups of driven wheels is horizontal structure;In the process of polishing rail head upper surface, the two sides driven wheels can be adjusted to move downward by adjusting mechanism, so that the two sides driven wheels synchronously drive the horizontal polishing abrasive belt to contact with rail head upper surface, then drive the two sides driven wheels to move downward again by a certain distance, the two sides driven wheels can press the horizontal polishing abrasive belt to bend and completely adhere to rail head upper surface during movement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of switch grinding technology, in particular to a switch grinding device and process. BACKGROUND

[0002] With the increasing use of high-speed heavy-haul trains, the quality requirements for rails are continuously improving, and rail maintenance is facing new challenges. Due to the high use cost and time limitation of large-scale grinding cars, and the low operation efficiency in complex switch railway sections, small and medium-sized railway maintenance equipment is commonly used in daily railway maintenance work. These devices have flexibility and low cost. The grinding machine used for rail switch finishing has been widely used in railway maintenance work areas and has become an indispensable main equipment in maintenance operations.

[0003] In the prior art, when grinding the track, the grinding wheel is usually installed on the track trolley. With the movement of the track trolley, the track head surface can be ground by the grinding wheel. However, in actual application, the upper surface of the rail head is not a horizontal structure and usually has a certain curvature. Therefore, when using the grinding wheel to grind, there will be a certain grinding dead angle on the upper surface of the rail head, which cannot achieve full grinding effect. SUMMARY

[0004] The present application provides a switch grinding device and process, which can solve the following problems existing in the prior art:

[0005] The upper surface of the rail head of the track is usually provided with an arc-shaped structure, so that there is a grinding dead angle when grinding with a grinding wheel.

[0006] A switch grinding device, comprising a walking trolley moving on both sides of the track, the walking trolley on both sides is symmetrically provided with a grinding mechanism for grinding the track;

[0007] The grinding mechanism comprises a grinding belt, and further comprises a group of driving wheels and two groups of driven wheels, the group of driving wheels and the two groups of driven wheels are arranged in a triangular shape, and the grinding belt is sleeved on the driving wheels and the driven wheels, the grinding belt between the two groups of driven wheels is a horizontal structure;

[0008] The driving wheel is connected with a servo device for driving rotation;

[0009] The grinding device further comprises an adjusting mechanism for adjusting the horizontal height of the two groups of driven wheels.

[0010] Preferably, the walking trolley comprises a frame, driving shafts are rotatably arranged on the front and rear sides of the bottom of the frame, respectively, and wheels for rolling connection with the track are sleeved on the driving shafts, respectively, and the wheels are locked and fixed on the driving shafts by nuts.

[0011] Preferably, the frame is provided with a positioning plate, the first screw is arranged on the side of the positioning plate facing the frame, and the end of the first screw is fixed with the output end of the first motor;

[0012] The first screw is symmetrically sleeved with the first nut, and the two first nuts are fixed with the adjusting plates, respectively.

[0013] Preferably, the frame is further provided with a second screw, and the second screw is symmetrically sleeved with the second nut fixed with the positioning plate.

[0014] Preferably, the frame is further provided with a guide rod, and the guide plate fixed with the positioning plate is sleeved with the guide rod.

[0015] Preferably, the two adjusting plates are respectively provided with a limiting seat at the bottom, the servo device comprises a second motor fixed on one side of the limiting seat, a driving wheel is rotatably arranged on the other side of the limiting seat, and the output end of the second motor is fixed with the driving wheel through the limiting seat.

[0016] Preferably, the two driven wheels are respectively rotatably arranged at the ends of the swing arms, the limiting plate is fixedly arranged at the bottom of the limiting seat, and the two swing arms are rotatably connected with the limiting plate through the shafts.

[0017] Preferably, the adjusting mechanism comprises a rotating part for driving the two shafts to synchronously rotate in opposite directions.

[0018] Preferably, the rotating part comprises a gear fixed on the end of the shaft.

[0019] The limiting plate is provided with a lifting cylinder on one side, and the U-shaped frame is fixedly arranged on the driving end of the lifting cylinder.

[0020] A process for polishing a turnout, applied to the above-mentioned polishing device for a turnout, comprising the following steps:

[0021] The polishing mechanism is arranged on the walking trolley, and the two polishing mechanisms are synchronously driven to move with the movement of the walking trolley.

[0022] In the initial state, the polishing belt between the two driven wheels is in a horizontal state and does not contact the upper surface of the rail head.

[0023] When polishing is needed, the adjusting mechanism adjusts the two driven wheels to move downward, so that the two driven wheels synchronously drive the horizontal polishing belt into contact with the upper surface of the rail head, and then drive the two driven wheels to move downward by a certain distance, so as to bend the horizontal polishing belt and completely adhere to the upper surface of the rail head.

[0024] The main driving wheel is driven to rotate by a servo device, and the grinding belt is driven to rotate in the process of rotation of the main driving wheel, so that the upper surface of the rail head is ground.

[0025] After grinding, the two driven wheels on both sides are driven to rise by the adjusting mechanism, and the grinding belt between the two driven wheels on both sides is separated from the rail;

[0026] The grinding device is driven to move forward by a walking trolley by a distance of the width of the grinding belt, and the above operation is repeated, and the grinding is reciprocated.

[0027] The present application provides a kind of switch grinding equipment and process, including the following beneficial effects:

[0028] 1) In the present application, since the upper surface of the rail head of the rail is not horizontal structure, when the horizontal grinding belt between the two driven wheels is used to grind, there will still be a grinding dead angle phenomenon, based on this, in the process of grinding the upper surface of the rail head, the initial state, the horizontal grinding belt between the two driven wheels is not in contact with the upper surface of the rail head, when grinding is needed, the two driven wheels on both sides can be adjusted downward by adjusting mechanism, so that the two driven wheels on both sides drive the horizontal grinding belt to contact with the upper surface of the rail head, and then drive the two driven wheels to move downward a certain distance, the two driven wheels can press the horizontal grinding belt to bend and completely adhere to the upper surface of the rail head in the process of movement, at this time, the main driving wheel is driven to rotate by a servo device, the main driving wheel can drive the grinding belt to rotate in the process of rotation, to grind the upper surface of the rail head;

[0029] 2) In the present application, when the upper surface of the rail head in contact with the grinding belt is ground, the two driven wheels on both sides can be driven upward again by adjusting mechanism, so that the grinding belt between the two driven wheels on both sides is separated from the rail, at this time, the grinding device can be driven to move forward by a walking trolley by a distance of the width of the grinding belt, and the above operation is repeated, to grind the upper surface of the rail head, and the grinding is reciprocated, so that the upper surface of the rail head of the rail can be ground completely, without grinding dead angle phenomenon;

[0030] 3) The application can drive the U-shaped frame to rise and fall through the lifting electric cylinder when driving the rotation of the two side support shafts. The U-shaped frame can drive the rotation of the support shafts through the meshing of the rack and pinion during the rising and falling process, thereby synchronously driving the rotation of the swing arms, ensuring that the two swing arms swing synchronously and the swing angles are consistent. The total length of the polishing belt is L1. When the adjusting mechanism drives the two sets of driven wheels to move downward, the total length of the polishing belt is L1. After calculation, L2 is less than L1. Therefore, under the condition that the total length of the polishing belt L1 remains unchanged, as the adjusting mechanism adjusts the two sets of driven wheels to move downward, the tightness of the polishing belt will gradually decrease, thereby making the polishing belt between the two sets of driven wheels more easily deformed and completely fit the upper surface of the rail head. The polishing belt will be straightened again during the deformation process to further improve the polishing effect on the rail head.

[0031] Correspondingly, if the polishing belt is always in a tight state and moves towards the rail head, it is difficult to deform, making it difficult for the polishing belt to completely fit the upper surface of the rail head, and the polishing belt is prone to breakage, which has poor stability. The up-and-down swinging of the swing arm driven driven wheel set by the application can effectively avoid this phenomenon and has higher stability.

[0032] 4) When adjusting the positions of the two polishing devices, the first screw rod can be driven to rotate by the first motor. The two first nuts on the first screw rod can drive the two sets of polishing devices to move towards each other or move away from each other synchronously through the adjusting plate during the movement process, adjust the positions of the polishing devices corresponding to the position of the rail, and improve the polishing accuracy of the rail. When adjusting the initial height of the two polishing devices, the handle is used to rotate the second screw rod. The second nut on the second screw rod can synchronously drive the positioning plate to rise and fall during the movement process, and the height of the two polishing devices is adjusted by the rise and fall of the positioning plate. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A structure diagram of a turnout polishing device is provided for the application.

[0034] Figure 2 A front view structure diagram of a turnout polishing device is provided for the application.

[0035] Figure 3 A top view structure diagram of a turnout polishing device is provided for the application.

[0036] Figure 4 A structure diagram of a walking trolley in a turnout polishing device is provided for the application. Figure 1

[0037] Figure 5 A structure diagram of a walking trolley in a turnout polishing device is provided for the application. Figure 2 ​​

[0038] Figure 6 A rear view schematic diagram of the traveling trolley in a turnout grinding device provided by the present invention;

[0039] Figure 7 A cross-sectional view of the traveling trolley in a turnout grinding device provided by the present invention;

[0040] Figure 8 This is a schematic diagram of the grinding mechanism in a turnout grinding device provided by the present invention;

[0041] Figure 9 This is a schematic diagram of the change in the grinding belt when the driven wheel swings in a turnout grinding device provided by the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Track; 2. Frame; 3. Positioning plate; 4. Grinding mechanism; 5. Lifting cylinder; 201. Controller; 202. Wheel; 203. Guide rod; 204. Guide plate; 205. Drive shaft; 301. Second nut; 302. Second screw; 303. First motor; 304. Adjusting plate; 305. First nut; 306. Limiting plate; 307. First screw; 308. Limiting seat; 401. Grinding belt; 402. Second motor; 403. Drive wheel; 501. U-shaped frame; 502. Rack; 503. Gear; 504. Swing arm; 505. Driven wheel. Detailed Implementation

[0044] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0045] Example 1

[0046] like Figures 1 to 3 As shown, an embodiment of the present invention provides a turnout grinding device, including a traveling trolley that moves on two side rails 1. Grinding mechanisms 4 for grinding the rails 1 are symmetrically arranged on both sides of the traveling trolley. Specifically, in this embodiment, by setting the grinding mechanisms 4 on the traveling trolley, the grinding mechanisms 4 on both sides can be driven to move synchronously as the traveling trolley moves, so that the effect of automatically grinding the rails 1 can be achieved during the travel, without the need for manual adjustment of the position of the grinding mechanisms 4.

[0047] In this embodiment, please refer to Figures 6-8 The grinding mechanism 4 includes a grinding belt 401, a set of driving wheels 403 and two sets of driven wheels 505. The driving wheels 403 and the two sets of driven wheels 505 are arranged in a triangular pattern, and the grinding belt 401 is sleeved on the driving wheels 403 and the driven wheels 505. The grinding belt 401 between the two sets of driven wheels 505 has a horizontal structure.

[0048] Wherein, the driving wheel 403 is connected with a servo device which drives the rotation of the driving wheel 403; it can be explained that, when the track 1 is polished, the servo device first drives the driving wheel 403 to rotate, and the driving wheel 403 can synchronously drive the polishing belt 401 to move on the two side driven wheels 505 in the process of rotation, and then the polishing belt 401 with horizontal structure can polish the track 1;

[0049] As a further scheme of the embodiment, the polishing device further comprises an adjusting mechanism, which is used to adjust the horizontal height of the two groups of driven wheels 505; it can be explained that, since the upper surface of the rail head of the track 1 is a non-horizontal structure, when the polishing belt 401 with horizontal structure between the two groups of driven wheels 505 is used to polish it, there will still be a polishing dead angle phenomenon, based on this, in the process of polishing the upper surface of the rail head, in the initial state, the polishing belt 401 between the two groups of driven wheels 505 is in a horizontal state and does not contact the upper surface of the rail head, when polishing is needed, the adjusting mechanism can be used to adjust the two side driven wheels 505 to move downward, so that the two side driven wheels 505 synchronously drive the horizontal polishing belt 401 to contact the upper surface of the rail head, and then drive the two side driven wheels 505 to move downward again by a certain distance, in the process of movement, the two side driven wheels 505 can press the horizontal polishing belt 401 to bend and completely adhere to the upper surface of the rail head (see Figure 7 ), at this time, the servo device drives the driving wheel 403 to rotate, and the driving wheel 403 can drive the polishing belt 401 to rotate in the process of rotation, so as to polish the upper surface of the rail head.

[0050] Correspondingly, after the upper surface of the rail head which contacts the polishing belt 401 is polished, the adjusting mechanism can be used to drive the two side driven wheels 505 to rise again, and then drive the polishing belt 401 between the two side driven wheels 505 to separate from the track, at this time, the walking trolley can be used to drive the polishing device to move forward by a distance of the width of the polishing belt 401, and the above operation is repeated again to polish the upper surface of the rail head, so as to comprehensively polish the upper surface of the rail head of the track 1, and the polishing dead angle phenomenon will not occur.

[0051] Embodiment 2

[0052] Based on embodiment 1, please refer to Figure 3The walking trolley of the embodiment comprises a frame 2, driving shafts 205 are rotatably arranged on the front and rear sides of the bottom of the frame 2, respectively, wheels 202 for rolling connection with the track 1 are sleeved on the driving shafts 205, respectively, and the wheels 202 are locked and fixed on the driving shafts 205 by nuts; specifically, walking motors for driving the wheels 202 to rotate are also arranged on the bottom of the frame 2, the walking motors are electrically connected with a controller 201 fixed on the frame 2, and the walking trolley can be driven to walk on the track 1 in an electric driving mode.

[0053] Correspondingly, the wheels 202 of the embodiment are fixed on the driving shafts 205 in a sleeving mode, so that the width of the wheels 202 on the two sides can be set based on the width of the track 1 on the two sides, to ensure that the wheels 202 on the two sides can walk stably on the track 1.

[0054] It should be further noted that when the widths of the two tracks 1 are different, in order to adjust the positions of the two polishing devices to be adapted to the positions of the track 1, please refer to Figures 6-7 A positioning plate 3 is arranged on the frame 2, a first screw 307 is rotatably arranged on the side of the positioning plate 3 facing the frame 2, the end of the first screw 307 is fixed with the output end of a first motor 303, the threads on the two sides of the first screw 307 are opposite in rotation direction, the first screw 307 is symmetrically sleeved with first nuts 305, the two first nuts 305 are fixed with adjusting plates 304, respectively, and the two groups of polishing devices are arranged on the corresponding adjusting plates 304; it can be explained that when the positions of the two polishing devices are adjusted, the first motor 303 can be driven to drive the first screw 307 to rotate, and the two first nuts 305 can be driven to move on the first screw 307, so that the two groups of polishing devices can be synchronously driven to move towards each other or away from each other through the adjusting plates 304, the positions of the polishing devices are adjusted to correspond to the positions of the track 1, so as to improve the polishing accuracy of the track 1.

[0055] In addition, in order to ensure the stability of the movement of the two first nuts 305 on the first screw 307, a track groove can be formed on the frame 2 to guide and limit the first nuts 305.

[0056] As a further scheme of the embodiment, please refer to Figures 1-2 In order to adjust the initial relative distance between the two polishing devices and the track 1, in the embodiment, a second screw 302 is also rotatably arranged on the frame 2, and a second nut 301 fixed with the positioning plate 3 is sleeved on the second screw 302; specifically, a handle can be fixedly arranged on the second screw 302, so that when the initial height of the two polishing devices is adjusted, the second screw 302 is rotated by the handle, and the positioning plate 3 can be synchronously driven to ascend and descend in the movement of the second nut 301 on the second screw 302, and the height of the two polishing devices is adjusted by the ascending and descending of the positioning plate 3.

[0057] In order to improve the stability of the positioning plate 3 lifting, the guide rod 203 is also fixed on the frame 2, and the guide plate 204 fixed with the positioning plate 3 is slidably arranged on the guide rod 203. Specifically, by arranging the guide rod 203 and the guide plate 204, the movement of the positioning plate 3 can be guided to ensure that the positioning plate 3 stably lifts along the vertical direction.

[0058] Specifically, as one of the ways in which the present embodiment can be implemented, reference can be made to Figures 6-8 The bottom of the two side adjusting plates 304 is respectively fixed with a limiting seat 308, the servo device includes a second motor 402 fixed on one side of the limiting seat 308, and a driving wheel 403 is rotatably arranged on the other side of the limiting seat 308, and the output end of the second motor 402 is fixed with the driving wheel 403 through the limiting seat 308. It can be explained that when the present embodiment is polishing the track 1, the second motor 402 can be started to drive the driving wheel 403 to rotate, and the driving wheel 403 can be synchronously driven to rotate in the process of rotating.

[0059] In the present embodiment, the two side driven wheels 505 are rotatably arranged at the end of the swing arm 504, and the limiting seat 308 is fixedly arranged at the bottom of the limiting plate 306. The two side swing arms 504 are rotatably connected with the limiting plate 306 through the shafts, wherein the adjusting mechanism includes a rotating part, the rotating part is used to drive the two side shafts to synchronously rotate, and the directions of the two side shafts are opposite. It can be explained that in the present embodiment, when the height of the two side driven wheels 505 needs to be adjusted, the two side shafts can be synchronously driven to rotate through the rotating part, and the driven wheels 505 can be driven to rise or fall through the swing arm 504 in the process of rotating, thereby the height of the polishing sand belt 401 between the two groups of driven wheels 505 can be adjusted.

[0060] Further, the rotating part includes a gear 503 fixed on the end of the shaft, wherein one side of the limiting plate 306 is fixedly arranged with a lifting electric cylinder 5, and the driving end of the lifting electric cylinder 5 is fixedly arranged with a U-shaped frame 501, and the two sides of the U-shaped frame 501 are symmetrically fixedly arranged with a rack 502 meshing with the two side gears 503 respectively. It can be explained that in the present embodiment, when the two side shafts are driven to rotate, the U-shaped frame 501 can be driven to lift through the lifting electric cylinder 5, and the shaft can be driven to rotate through the meshing of the rack 502 and the gear 503 in the process of lifting, thereby synchronously driving the swing arm 504 to rotate, ensuring that the two side swing arms 504 synchronously swing and the swing angles are consistent.

[0061] It should be further pointed out that reference can be made to Figure 9 , Figure 9In order to adjust the two groups of driven wheels 505 to move downward, the change diagram of the polishing belt 401 is shown, the total length of the polishing belt 401 is L1, when the adjusting mechanism drives the two groups of driven wheels 505 to move downward, the total length of the polishing belt 401 is L2, after calculation, L2 is less than L1, therefore, in the case that the total length of the polishing belt 401 is L1, with the adjusting mechanism adjusting the two groups of driven wheels 505 to move downward, the tightness of the polishing belt 401 will gradually decrease, and then the polishing belt 401 between the two groups of driven wheels 505 is more likely to deform and completely adhere to the upper surface of the rail head, and the polishing belt 401 is straightened again in the process of deformation, so as to improve the polishing effect on the rail head;

[0062] Correspondingly, if the polishing belt 401 is always in a tight state and moves towards the rail head, it is difficult to deform, so that the polishing belt 401 cannot completely adhere to the upper surface of the rail head, and the polishing belt 401 is prone to breakage, and the stability is poor, and the driving of the swing arm 504 to drive the driven wheels 505 to swing up and down can effectively avoid the phenomenon, and the stability is higher.

[0063] A process for polishing a turnout, comprising the following steps:

[0064] Please refer to Figures 1-4 S1, the polishing mechanism 4 is arranged on the walking trolley, and the two sides of the polishing mechanism 4 are driven to move synchronously with the movement of the walking trolley;

[0065] S2, in the initial state, the polishing belt 401 between the two groups of driven wheels 505 is in a horizontal state, and does not contact the upper surface of the rail head;

[0066] S3, when polishing is needed, the adjusting mechanism adjusts the two groups of driven wheels 505 to move downward, so that the two groups of driven wheels 505 synchronously drive the horizontal polishing belt 401 to contact the upper surface of the rail head, and then drive the two groups of driven wheels 505 to move downward by a certain distance, so as to bend the horizontal polishing belt 401 and completely adhere to the upper surface of the rail head;

[0067] S4, the servo device drives the driving wheel 403 to rotate, and the driving wheel 403 can drive the polishing belt 401 to rotate in the process of rotation, so as to polish the upper surface of the rail head.

[0068] S5, after polishing, the adjusting mechanism drives the two groups of driven wheels 505 to rise, and drives the polishing belt 401 between the two groups of driven wheels 505 to separate from the rail;

[0069] S6, the walking trolley drives the polishing device to move forward by a distance of the width of the polishing belt 401, and the above operation is repeated again, and so on.

[0070] The above disclosed are only several specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any changes that can be thought of by those skilled in the art shall fall within the protection scope of the present application.

Claims

1. A switch grinding apparatus comprising a trolley moving on two side rails (1), characterized in that, The two sides of the walking trolley are symmetrically provided with polishing mechanisms (4) for polishing the track (1); The polishing mechanism (4) comprises a polishing abrasive belt (401) and a set of driving wheels (403) and two sets of driven wheels (505). The set of driving wheels (403) and the two sets of driven wheels (505) are arranged in a triangular shape, and the polishing abrasive belt (401) is sleeved on the driving wheels (403) and the driven wheels (505). The polishing abrasive belt (401) between the two sets of driven wheels (505) is in a horizontal structure. The driving wheel (403) is connected with a servo device for driving rotation. The polishing device further comprises an adjusting mechanism for adjusting the horizontal height of the two sets of driven wheels (505).

2. A switch grinding apparatus as claimed in claim 1, wherein, The walking trolley comprises a frame (2), and driving shafts (205) are rotatably arranged on the front and rear sides of the bottom of the frame (2). The driving shafts (205) are respectively sleeved with wheels (202) for rolling connection with the track (1). The wheels (202) are locked and fixed on the driving shafts (205) by nuts.

3. A switch grinding apparatus as claimed in claim 2, wherein, A positioning plate (3) is arranged on the frame (2). A first screw (307) is rotatably arranged on the side of the positioning plate (3) facing the frame (2). The end of the first screw (307) is fixed with the output end of a first motor (303). The first screw (307) is symmetrically and spirally sleeved with first nuts (305). The two first nuts (305) are respectively fixed with adjusting plates (304). The two sets of polishing devices are respectively arranged on the adjusting plates (304) on the corresponding side.

4. A switch grinding apparatus as claimed in claim 3, wherein, A second screw (302) is also rotatably arranged on the frame (2). The second screw (302) is spirally sleeved with a second nut (301) fixed with the positioning plate (3).

5. A switch grinding apparatus as claimed in claim 4, wherein, A guide rod (203) is also fixedly arranged on the frame (2). A guide plate (204) is slidably sleeved on the guide rod (203) and fixed with the positioning plate (3).

6. A switch grinding apparatus as claimed in claim 3, wherein, Limiting seats (308) are fixedly arranged on the bottom of the adjusting plates (304) on both sides. A servo device comprises a second motor (402) fixed on one side of the limiting seat (308). The driving wheel (403) is rotatably arranged on the other side of the limiting seat (308). The output end of the second motor (402) penetrates through the limiting seat (308) and is fixed with the driving wheel (403).

7. A switch grinding apparatus as claimed in claim 6, characterised in that, The driven wheels (505) on both sides are rotatably arranged on the end of the swing arm (504). Limiting plates (306) are fixedly arranged on the bottom of the limiting seat (308). The swing arms (504) on both sides are rotatably connected with the limiting plate (306) through the shafts.

8. A switch grinding apparatus as claimed in claim 7, characterised in that, The adjusting mechanism comprises a rotating part for driving the shafts on both sides to synchronously rotate in opposite directions.

9. A switch grinding apparatus as claimed in claim 8, characterised in that, The rotating part comprises a gear (503) fixed on the end of the shaft. The limiting plate (306) is fixedly arranged on one side of the limiting plate (306). A lifting electric cylinder (5) is fixedly arranged on one side of the limiting plate (306). The driving end of the lifting electric cylinder (5) is fixedly arranged with a U-shaped frame (501). The U-shaped frame (501) is symmetrically fixed with a rack (502) engaged with the gears (503) on both sides.

10. A process for switch grinding, characterized by, The application is applied to the switch polishing device of any one of claims 1-9, comprising the following steps: The polishing mechanism (4) is arranged on the walking trolley, and moves synchronously with the walking trolley; In the initial state, the polishing belt (401) between the two groups of driven wheels (505) is in a horizontal state and does not contact the upper surface of the rail head; When polishing is needed, the adjusting mechanism adjusts the two driven wheels (505) to move downward, so that the two driven wheels (505) synchronously drive the horizontal polishing belt (401) to contact the upper surface of the rail head, and then drive the two driven wheels (505) to move downward again by a certain distance, so as to bend the horizontal polishing belt (401) and completely adhere to the upper surface of the rail head; The main driving wheel (403) is driven to rotate by the servo device, and the polishing belt (401) is driven to rotate during the rotation of the main driving wheel (403), so as to polish the upper surface of the rail head; After polishing, the adjusting mechanism drives the two driven wheels (505) to rise, so that the polishing belt (401) between the two driven wheels (505) is separated from the rail; The walking trolley drives the polishing device to move forward by a distance of the width of the polishing belt (401), and the above operation is repeated again.

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