Polishing device for non-acting edge of switch rail

Abstract

The invention relates to a point rail non-acting edge grinding device. The point rail non-acting edge grinding device comprises a rack, an air cylinder, a grinding machine rotating base, a grinding machine and a constant-pressure control mechanism. The rack is used for being installed on a grinding trolley. The air cylinder is rotationally connected with the machine frame, and a push rod of the air cylinder is rotationally connected with the grinding machine rotating base. The grinding machine revolving bed is rotationally connected with the rack; the grinding machine is connected with the grinding machine revolving bed; and the constant-pressure control mechanism is used for controlling the thrust of the air cylinder to be constant. By arranging the air cylinder, the grinding machine rotating base and the constant-pressure control mechanism, it is guaranteed that the thrust for pushing the grinding wheel to abut against the non-acting edges of the switch rail and the wing rail is constant, it is guaranteed that the grinding force is consistent, and the quality problem caused by uneven manual grinding force is avoided; the grinding machine is prevented from falling off by arranging an anti-falling mechanism, and safe and stable operation of equipment is guaranteed by arranging a proximity switch and a locking mechanism; a plurality of pairs of devices are symmetrically installed on the grinding trolley, different parts are ground at the same time, and the grinding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rail grinding equipment, in particular to a grinding device for a non-active edge of a pointed rail. Background Art

[0002] Wear on the inactive side of the rail point may cause changes in the overall structure of the rail point. The rail point fits closely with other components in the turnout. When the inactive side is worn, its own force balance is broken, which may cause the rail point to twist and deform, thereby affecting the geometric dimensional accuracy of the turnout and reducing the overall stability of the turnout. The existing rail point tread is relatively thin, and after long-term rolling by vehicles, the inactive side is prone to fat edges. If the fat edge is too large, it is easy to be rolled off when the vehicle passes, causing the rail point to fall off, and the resulting metal debris will fall around other parts of the turnout. These debris enter the inside of equipment such as the turntable or the gaps of other moving parts, which will aggravate the wear of these parts, affect their normal mechanical properties, and increase the failure rate of the equipment. In addition, the worn inactive side may cause problems such as unsmooth turnout conversion and shaking when the train passes, so it is necessary to regularly grind the inactive side of the rail point.

[0003] At present, in the field of rail grinding, various large rail grinding vehicles are usually used to grind the basic rails of rails. However, the grinding area of ​​large grinding vehicles is limited, and they cannot effectively grind the non-active edges of the point rails and wing rails of the rails. Therefore, areas such as turnouts, guard rails, and point rails need to be manually ground. Manual grinding operations are inefficient, of poor quality, consume a lot of manpower, cannot guarantee the consistency of grinding force, and the grinding quality cannot meet the requirements. Summary of the invention

[0004] The invention provides a non-active edge grinding device for a point rail, which can be used for grinding the non-active edges of a point rail and a wing rail, thereby ensuring the consistency of grinding force, improving grinding efficiency and ensuring grinding quality.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A non-active edge grinding device for a pointed rail comprises: a frame, a cylinder, a grinding machine rotary seat, a grinding machine and a constant pressure control mechanism;

[0007] The frame is used to be installed on the grinding trolley;

[0008] The cylinder is rotatably connected to the frame, and the push rod of the cylinder is rotatably connected to the grinder rotary seat;

[0009] The grinding machine rotary seat is rotatably connected to the frame;

[0010] The grinder is connected to the grinder rotary seat, and the cylinder drives the grinder rotary seat to rotate so that the grinding wheel of the grinder is close to the non-active edge of the pointed rail, and the non-active edge of the pointed rail is ground through the outer circumferential surface of the grinding wheel;

[0011] The constant pressure control mechanism is used to control the thrust of the cylinder to be constant.

[0012] In one embodiment, the constant pressure control mechanism includes a pressure regulating valve, an accumulator and a pressure regulating overflow valve, the pressure regulating valve is arranged on the intake pipe of the cylinder, the accumulator is connected to the pressure regulating overflow valve, the pressure regulating overflow valve is connected to the intake pipe between the pressure regulating valve and the cylinder, the accumulator is also connected to a one-way valve, and the one-way valve is connected to the intake pipe between the pressure regulating valve and the cylinder.

[0013] In one embodiment, the non-active edge grinding device of the point rail further includes a locking mechanism, and the locking mechanism is used to fix the grinder swivel seat to the upper part of the frame.

[0014] In one embodiment, the locking mechanism is a locating pin arranged on the frame and a locating hole arranged on the grinder rotary seat, the locating pin is provided with an elastic recovery structure along its length direction, the tip of the locating pin protrudes beyond the surface of the frame, the tip of the locating pin is provided with a chamfer, and the end of the chamfer does not protrude beyond the surface of the frame.

[0015] In one embodiment, the non-active edge grinding device of the point rail further includes a proximity switch for determining that the grinder rotary seat rotates to the upper part of the frame. The proximity switch is arranged on the frame, and a trigger plate cooperating with the proximity switch is provided on the grinder rotary seat.

[0016] In one embodiment, a handle is provided on the grinding machine rotary seat, and the handle is a U-shaped structure.

[0017] In one embodiment, the non-active edge grinding device of the point rail further includes an anti-falling mechanism and a loosening alarm for preventing the grinder from falling off.

[0018] In one embodiment, the anti-falling mechanism includes an anti-falling screw and an anti-falling ring, the anti-falling screw is threadedly connected to the grinder rotary seat, the anti-falling screw is connected to the anti-falling ring, and the grinding wheel of the grinder passes through the anti-falling ring; a gap is provided between the anti-falling ring and the grinder, and electrode sheets are provided at the relative positions of the anti-falling ring and the grinder, and the two electrode sheets are electrically connected to a loosening alarm, and the loosening alarm is an audible and visual alarm.

[0019] In one embodiment, a plurality of pairs of the non-active edge grinding devices of the point rail are respectively installed on the left and right sides of the grinding carriage and are symmetrically distributed, and the grinding wheel of the grinder is arranged toward the inner side of the grinding carriage.

[0020] In one embodiment, the grinder is a pneumatic grinder with adjustable speed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention can be used to specially grind the non-active edges of the point rail and the wing rail, thus making up for the limitation of the grinding area of ​​the large grinding vehicle, reducing the manual grinding operation, lowering the manpower cost, alleviating the labor intensity, and improving the operation safety; the present invention ensures that the thrust for pushing the grinding wheel close to the non-active edges of the point rail and the wing rail is constant by arranging a cylinder, a grinder swivel seat and a constant pressure control mechanism, thus ensuring the uniform grinding force and avoiding the quality problems caused by the uneven manual grinding force; the anti-drop mechanism is arranged to prevent the grinder from falling off, and the proximity switch and the locking mechanism are arranged to ensure the safe and stable operation of the equipment; a plurality of pairs of devices are symmetrically installed on the grinding vehicle to grind different parts at the same time, thereby improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the structure of the basic rail and the pointed rail of the railway in the prior art;

[0025] Figure 2 This is a front view of the non-active edge grinding device of the point rail installed on the grinding trolley;

[0026] Figure 3 is a side view of the non-active edge grinding device of the point rail;

[0027] Figure 4 is a top view of the non-active edge grinding device of the point rail;

[0028] Figure 5 This is a schematic diagram of the structure of the non-active edge grinding device of the point rail Figure 1 ;

[0029] Figure 6 This is a schematic diagram of the structure of the non-active edge grinding device of the point rail Figure 2 ;

[0030] Figure 7 This is a schematic diagram of the structure in which the non-active edge grinding device of the point rail is installed at the front and rear ends of the grinding trolley;

[0031] Figure 8 This is a top view of the structure in which the non-active edge grinding device of the point rail is installed at the four corners of the grinding trolley;

[0032] Fig. 9 It is the structural principle diagram of the constant pressure control mechanism.

[0033] Reference numerals:

[0034] 1. Frame; 2. Cylinder; 3. Cylinder mounting seat; 4. Locating pin; 5. Grinder swivel seat; 5-1. Handle; 5-2. Trigger plate; 6. Grinder; 7. Fixing bar; 8. Proximity switch; 9. Rotating pin; 10. Anti-slip screw; 11. Anti-slip ring; 12. Grinding wheel; 13. Grinding trolley; 14. Basic rail; 15. Point rail; 15-1. Non-active side of point rail; 16. Switch machine; 17. Pressure regulating valve; 18. Accumulator; 19. Pressure regulating relief valve; 20. Check valve. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figure 1As shown, in the prior art, the point rail 15 at the turnout is connected to the switch machine 16, and the side of the point rail 15 facing the base rail 14 is the point rail non-active side 15-1. The inner sides of the two base rails 14 at the turnout are both provided with point rails 15, and the point rail 15 on one side is close to the base rail 14, while the point rail 15 on the other side is away from the base rail 14. The left and right movements of the switch machine 16 make the point rails 15 on the left and right sides respectively fit the base rail 14 to realize the track changing operation.

[0040] When grinding the non-active edge 15-1 of the point rail, the spacing between the point rail 15 and the base rail 14 varies along the direction of the track. The spacing is largest at the tip of the point rail 15, and the spacing is smaller as it is farther away from the tip of the point rail 15. In order to ensure the consistency of the grinding force, the grinding mechanism needs to be able to keep the grinding wheel 12 close to the non-active edge 15-1 of the point rail and keep the contact pressure constant.

[0041] The present invention provides a non-active edge grinding device for a pointed rail, such as Figures 2 to 9 As shown, it can be used for grinding the non-active edges of the point rail and the wing rail to ensure the consistency of the grinding force, improve the grinding efficiency and ensure the grinding quality.

[0042] A device for grinding the non-active edge of a pointed rail comprises: a frame 1, a cylinder 2, a grinder swivel seat 5, a grinder 6 and a constant pressure control mechanism; the frame 1 is used to be installed on a grinding trolley 13; the cylinder 2 is rotatably connected to the cylinder mounting seat 3, the cylinder mounting seat 3 is fixedly connected to the frame 1, and the end of the cylinder mounting seat 3 extends outward to the outside of the basic rail 14, so that the push rod of the cylinder 2 has a movable range located on the inside of the basic rail 14, and the push rod of the cylinder 1 is rotatably connected to the grinder swivel seat 5; the grinder swivel seat 5 is rotatably connected to the frame 1 through a rotating pin 9; the cylinder 2 moves to push the grinder swivel seat 5 to rotate around the rotating pin 9; a grinder 6 is installed on the grinder swivel seat 5, and the grinder 6 is fixed to the grinder swivel seat 5 through two fixing bars 7, the fixing bars 7 are semicircular and are aligned with the frame 1. The fixing seat corresponding to the fixing bar 7 is also semicircular, and the two are combined with fasteners to fix the circular grinder 6. The cylinder 2 pushes the grinder swivel seat 5 to rotate so that the grinding wheel 12 of the grinder 6 is close to the non-active edge 15-1 of the point rail, and the non-active edge 15-1 of the point rail is grinded by the outer circumferential surface of the grinding wheel 12. The grinding wheel 12 has a certain thickness. For example, the thickness of the grinding wheel 12 is greater than or equal to 5 cm, and the spacing between the point rail 15 and the basic rail 14 does not vary much. The grinding wheel 12 set in a smaller rotation angle range of the grinder 6 can grind the non-active edge 15-1 of the point rail; in order to ensure the consistency of the grinding force and keep the thrust of the cylinder 2 constant, a constant pressure control mechanism needs to be set to control the thrust of the cylinder 2 to be constant.

[0043] Specifically, Fig. 9As shown, the constant pressure control mechanism includes a pressure regulating valve 17, an accumulator 18 and a pressure regulating relief valve 19. The pressure regulating valve 17 is arranged on the air intake pipeline of the cylinder 2. The accumulator 18 is connected to the pressure regulating relief valve 19. The pressure regulating relief valve 19 is connected to the air intake pipeline between the pressure regulating valve 17 and the cylinder 2. The accumulator 18 is also connected to a check valve 20. The check valve 20 is connected to the air intake pipeline between the pressure regulating valve 17 and the cylinder 2. By setting the pressure regulating valve 17, the gas pressure entering the cylinder 2 can be set, thereby limiting the thrust of the cylinder 2, ensuring the pressure stability between the grinding wheel 12 and the non-active edge 15-1 of the point rail, realizing the change of the spacing between the non-active edge 15-1 of the point rail, and realizing adaptive grinding.

[0044] In this embodiment, the non-active edge grinding device of the point rail further includes a locking mechanism, which is used to fix the grinding machine swivel seat 5 to the upper part of the frame 1. When the grinding device is not needed, the entire grinding device can be placed within the limit through the locking mechanism without affecting driving safety.

[0045] Specifically, the locking mechanism is a positioning pin 4 provided on the frame 1 and a positioning hole provided on the grinder swivel seat 5. The positioning pin 4 is provided with an elastic recovery structure along its length direction. The tip of the positioning pin 4 exceeds the surface of the frame 1. The tip of the positioning pin 4 is provided with a chamfer, and the end of the chamfer does not exceed the surface of the frame 1. With such a configuration, when the grinder swivel seat 5 needs to be locked, it is only necessary to rotate the grinder swivel seat 5 to the positioning pin 4. The grinder swivel seat 5 touches the chamfer of the tip of the positioning pin 4, and the positioning pin 4 is squeezed and compressed back. When the positioning hole reaches the positioning pin 4, the positioning pin 4 rebounds under the action of the elastic recovery structure, and the tip is inserted into the positioning hole, thereby locking the grinder swivel seat 5.

[0046] In this embodiment, the non-active edge grinding device of the point rail further includes a proximity switch 8, which is used to determine that the grinder rotary seat 5 rotates to the upper part of the frame 1. The proximity switch 8 is arranged on the frame 1, and a trigger plate 5-2 cooperating with the proximity switch is arranged on the grinder rotary seat 5. In order to facilitate the folding and unfolding of the grinder rotary seat 5, a handle is arranged on the grinder rotary seat, and the handle is a U-shaped structure.

[0047] During the use of the grinding device, since the vibration of the grinder 6 is relatively strong, the fasteners of the fixing strip 7 may easily loosen, which may cause the grinder 6 to fall off, causing damage to the grinder 6 or the rail. In order to prevent the risk of the grinder 6 falling off, the pointed rail non-active edge grinding device is also provided with an anti-falling mechanism and a loosening alarm for preventing the grinder 6 from falling off.

[0048] Specifically, the anti-slip mechanism includes an anti-slip screw 10 and an anti-slip ring 11, the anti-slip screw 10 is threadedly connected to the grinder swivel seat 5, the anti-slip screw 10 is connected to the anti-slip ring 11, and the grinding wheel 12 of the grinder 6 passes through the anti-slip ring 11. Once the fastener is loosened and the grinder 6 falls off, the grinder 6 will be cut off by the anti-slip ring 11; a gap is provided between the anti-slip ring 11 and the grinder 6, and electrode sheets are provided at the relative positions of the anti-slip ring 11 and the grinder 6. The two electrode sheets are electrically connected to a loosening alarm, and the loosening alarm is an audible and visual alarm. Once the grinder 6 falls off and is cut off by the anti-slip ring 11, the two electrode sheets are connected, and the audible and visual alarm is activated to sound an alarm, so that the operator can discover it in time and carry out maintenance.

[0049] In this embodiment, a plurality of non-active edge grinding devices of the point rail are respectively installed on the left and right sides of the grinding trolley 13 and are symmetrically distributed. Figure 7 and 8 As shown, the non-active edge grinding device of the point rail can be arranged at the front and rear ends of the grinding trolley 13. When the arrangement is symmetrical, the four corners are provided with grinding devices, and the grinding wheel 12 of the grinder 6 is arranged toward the inner side of the grinding trolley 13. By arranging multiple pairs of grinding devices, different parts of the non-active edge 15-1 of the point rail can be ground at the same time, further improving the grinding efficiency.

[0050] In this embodiment, the grinder 6 is a pneumatic grinder with adjustable speed, and the same air pump can be used to supply air to each cylinder and the grinder 6. The pneumatic grinder is compact in size, easy and convenient to install, has low vibration, and has a fast speed. The rotary switch can adjust the speed and has a wide range of uses. It can be used for grinding and polishing, rust removal and trimming, deburring and welding edge processing, etc. The type of grinding head can be switched at will. In other embodiments, the grinder 6 can also be an electric grinder, and the air pump supplies air to each cylinder 2, and an electronic control system needs to be designed to power each grinder 6.

[0051] The method of using this device is as follows:

[0052] When the grinding trolley 13 moves in the direction of the rail to the front of the point rail 15 to be ground, use the grinding device on the side of the point rail 15 away from the base rail 14 to grind. First, manually pull the positioning pin 4 to unlock the grinder swivel seat 5. The grinder swivel seat 5 presses back the push rod of the cylinder 2 under the action of gravity, and the grinding wheel 12 falls back to between the base rail 14 and the point rail 15. Move the trolley forward so that the grinding wheel 12 is located on the inner side of the end of the point rail 15. Supply air to the cylinder 2 and the grinder 6. The cylinder 2 pushes the grinder swivel seat 5 to rotate so that the grinding wheel 12 is close to the non-active edge 15-1 of the point rail for grinding. The grinding trolley 13 moves in the direction of the rail. As the distance between the base rail 14 and the point rail 15 becomes smaller and smaller, the contact pressure between the grinding wheel 12 and the non-active edge 15-1 of the point rail increases, the push rod of the cylinder 2 is pressed, the rodless chamber pressure of the cylinder 2 increases, the pressure regulating relief valve 19 is turned on, and the excess pressure is released to the accumulator 18, thereby ensuring that the rodless chamber pressure of the cylinder 2 is constant, making the thrust of the cylinder 2 constant, making the contact pressure between the grinding wheel 12 and the non-active edge 15-1 of the point rail constant, and ensuring the consistency of the grinding force. If the distance becomes larger, the air pump will continue to provide the set pressure to the cylinder 2 through the pressure regulating valve 17 to ensure that the thrust of the cylinder 2 is constant. If the air pump stops unexpectedly and causes the air pressure in the air supply pipeline to drop, the one-way valve 20 is turned on and the accumulator 18 replenishes air to the air supply pipeline to prevent the air supply pipeline from losing pressure quickly. The grinder swivel seat 5 and the grinder 6 are quickly pressed back by gravity to the push rod of the cylinder 2, causing the grinding wheel 12 to collide with the base rail 14 and damage the grinder 6. After completing the grinding of the non-active edge 15-1 of the point rail on one side, the grinding trolley 13 leaves the point rail 15 area, and the hand-held handle 5-1 rotates the grinder swivel seat 5 to the locating pin 4 and locks it. Use the switch machine 16 to switch the point rail 15 so that the other side of the point rail 15 is away from the base rail 14. Use the grinding device on the other side to repeat the above operation process to complete the grinding of the non-active edge 15-1 of the other side of the point rail. This device can also be used for grinding the non-active edge of the wing rail.

[0053] To sum up, the present invention can be used specifically for grinding the non-active edges of the point rail and the wing rail, which makes up for the limitation of the grinding area of ​​the large grinding vehicle, reduces manual grinding operations, reduces labor costs, reduces labor intensity, and improves work safety; the present invention ensures that the thrust for pushing the grinding wheel close to the non-active edges of the point rail and the wing rail is constant by arranging a cylinder, a grinder swivel seat and a constant pressure control mechanism, thereby ensuring consistent grinding force and avoiding quality problems caused by uneven manual grinding force; an anti-slip mechanism is arranged to prevent the grinder from falling off, and a proximity switch and a locking mechanism are arranged to ensure safe and stable operation of the equipment; multiple pairs of devices are symmetrically installed on the grinding vehicle to grind different parts at the same time, thereby improving grinding efficiency.

[0054] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A non-active edge grinding device for a pointed rail, characterized in that: include: Frame, cylinder, grinder swivel seat, grinder and constant pressure control mechanism; The frame is used to be installed on the grinding trolley; The cylinder is rotatably connected to the frame, and the push rod of the cylinder is rotatably connected to the grinder rotary seat; The grinding machine rotary seat is rotatably connected to the frame; The grinder is connected to the grinder rotary seat, and the cylinder drives the grinder rotary seat to rotate so that the grinding wheel of the grinder is close to the non-active edge of the pointed rail, and the non-active edge of the pointed rail is ground through the outer circumferential surface of the grinding wheel; The constant pressure control mechanism is used to control the thrust of the cylinder to be constant.

2. The non-active edge grinding device of the point rail according to claim 1, characterized in that: The constant pressure control mechanism includes a pressure regulating valve, an accumulator and a pressure regulating overflow valve. The pressure regulating valve is arranged on the intake pipe of the cylinder. The accumulator is connected to the pressure regulating overflow valve. The pressure regulating overflow valve is connected to the intake pipe between the pressure regulating valve and the cylinder. The accumulator is also connected to a one-way valve. The one-way valve is connected to the intake pipe between the pressure regulating valve and the cylinder.

3. The non-active edge grinding device of the point rail according to claim 1, characterized in that: It also includes a locking mechanism, which is used to fix the grinder rotary seat to the upper part of the frame.

4. The non-active edge grinding device of the point rail according to claim 3, characterized in that: The locking mechanism is a positioning pin arranged on the frame and a positioning hole arranged on the grinder rotary seat. The positioning pin is provided with an elastic recovery structure along its length direction. The tip of the positioning pin passes through the frame and exceeds the surface of the frame. The tip of the positioning pin is provided with a chamfer, and the end of the chamfer does not exceed the surface of the frame.

5. The non-active edge grinding device of the point rail according to claim 3, characterized in that: It also includes a proximity switch for determining that the grinder rotary seat rotates to the upper part of the frame. The proximity switch is arranged on the frame, and a trigger plate matching the proximity switch is arranged on the grinder rotary seat.

6. The non-active edge grinding device of the point rail according to claim 3, characterized in that: A handle is provided on the grinding machine rotary seat, and the handle is a U-shaped structure.

7. The non-active edge grinding device of the point rail according to claim 1, characterized in that: The utility model also comprises an anti-falling mechanism and a loosening alarm for preventing the grinding machine from falling off.

8. The non-active edge grinding device of the point rail according to claim 7, characterized in that: The anti-drop mechanism includes an anti-drop screw and an anti-drop ring, the anti-drop screw is threadedly connected to the grinder rotary seat, the anti-drop screw is connected to the anti-drop ring, and the grinding wheel of the grinder passes through the anti-drop ring; a gap is provided between the anti-drop ring and the grinder, electrode sheets are provided at the relative positions of the anti-drop ring and the grinder, and the two electrode sheets are electrically connected to a loosening alarm, and the loosening alarm is an audible and visual alarm.

9. The non-active edge grinding device of the point rail according to claim 1, characterized in that: A plurality of pairs of non-active edge grinding devices of the pointed rail are respectively installed on the left and right sides of the grinding trolley and are symmetrically distributed, and the grinding wheels of the grinding machines are arranged toward the inner side of the grinding trolley.

10. The non-active edge grinding device of the point rail according to any one of claims 1 to 9, characterized in that: The grinding machine is a pneumatic grinding machine with adjustable speed.

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