EP3366837B1

EP3366837B1 - Rail surface grinding device and rail surface grinding method

Info

Publication number: EP3366837B1
Application number: EP15906301.5A
Authority: EP
Inventors: Woo Tae Jeong; Su Hyung Lee; Yun Suk Kang
Original assignee: Korea Railroad Research Institute KRRI
Current assignee: Korea Railroad Research Institute KRRI
Priority date: 2015-10-13
Filing date: 2015-10-26
Publication date: 2020-11-18
Anticipated expiration: 2035-10-26
Also published as: EP3366837A1; KR101697502B1; CN108291372A; WO2017065338A1; EP3366837A4

Description

[Technical Field]

The present invention relates to a device and method for consistently grinding the railhead surface on welded parts, connected parts, abraded parts, worn parts, damaged parts or other irregular parts of the rail. The present invention, in particular, relates to a railhead surface grinding device and method that can be installed and used on a rail after being carried by an operator and transferred to the rail. The present invention, more in particular, relates to a railhead surface grinding device and a railhead surface grinding method that can perform grinding while inclining a grinding stone according to a transverse direction of a curved shape of an upper railhead surface in transverse cross section of the rail, and perform grinding while monitoring the grinded railhead surface, thereby achieving grinding in a precise shape. In addition, the present invention relates to a railhead surface grinding device that is to be applied to a grooved rail and a railhead surface grinding method using the same.

[Background Art]

In connecting rails in longitudinal direction by welding, welded parts are formed, and the railhead surface is uneven or irregular on the welded parts, so it is necessary to make the railhead surface smooth by grinding. In addition to the welded parts, it is necessary to grind the uneven railhead surface such as connected parts, abraded parts, worn parts and surface damaged parts of the rail. However, in grinding the railhead surface, it is very important to grind consistently with the original surface shape of the rail in transverse cross section. The upper railhead surface in cross section (rail transverse cross section) assumes a curve shape in transverse direction when the cut rail is viewed in longitudinal direction (a direction in which the rail extends along). For convenience, the upper railhead surface having a curved shape in transverse direction is referred to as "rail transverse cross-sectional profile".
In some related art, a grinding stone only moves up and down perpendicularly in vertical direction, so the grinding stone comes into contact with the railhead surface horizontally. When the grinding stone only contacts the rail in the shape of horizontal surface, there is a fundamental limitation because it is impossible that even though the irregular railhead surface is grinded, the grinded surface has the same transverse cross-sectional profile as the other parts of the rail.
Additionally, in the related art, a grinding device is installed on a car or train traveling along the rail, and there are many inconveniences in quickly installing and using at a local place requiring grinding of the rail. The related art has a limitation in that precise grinding is difficult because the grinded degree of the railhead surface only relies on an operator's skill or observation with naked eye. For instance, WO 94/11153 A1 discloses a railhead surface grinding device for non-grooved rails, having a frame including a slide frame having a carriage disposed thereon for movement in a longitudinal direction with respect to the rails of the track, wherein a grinder is mounted to the carriage by means of a support; the slide frame is used as a longitudinal displacer for moving the grinder along the rail.
In the case of a grooved rail that is a form of a rail embedded in a track slab, welded parts of the rail need to be grinded, but the conventional grinding device has a limitation in that it is unsuitable for use in a grooved rail.

[Disclosure of the Invention]

[Technical Problem]

The present invention is developed to overcome the limitation of the related art, and therefore the present invention aims to provide a grinding device for consistently grinding the railhead surface on welded parts or other irregular parts of the rail, wherein the grinding device is designed to allow an operator to easily carry, so that the operator can install and use the grinding device at a location of the rail requiring grinding conveniently and quickly. Furthermore, the present invention aims to achieve grinding according to the curved rail transverse cross-sectional profile by performing a grinding operation while inclining a grinding stone. Additionally, the present invention aims to achieve grinding in a precise shape by performing grinding while monitoring the grinded railhead surface in real time. In addition, the present invention aims to provide a grinding device with universality that can be also applied to a grooved rail.

[Technical Solution]

To achieve the above-described object, the present invention provides a railhead surface grinding device for grinding a railhead surface of a grooved rail, comprising the features of claim 1, comprising a frame which is to be coupled to the rail to install the railhead surface grinding device on the rail, a horizontal movement frame member which, in use, extends in a transverse direction of the rail, wherein said frame member is coupled to the frame and is adapted to move in a longitudinal direction of the rail along the frame, a lifting part which is coupled to the horizontal movement frame member and is adapted to move in the transverse direction of the rail along the horizontal movement frame member, the lifting part to be extending in a perpendicular direction to the rail; and
a rotation driving part which is coupled to the lifting part and is moveable up and down in a perpendicular direction to the rail along the lifting part, the rotation driving part having a lower end to which a grinding stone is coupled to perform rotation driving of the grinding stone, wherein the rotation driving part is rotatably coupled to the lifting part so as to be rotatable on both sides in the transverse direction of the rail, from the perpendicular direction to the rail, to incline the grinding stone to come into close contact with the railhead surface to conform to a curved gradient of an upper part of the railhead surface in the transverse direction of the rail and to grind according to the curved shape of the curved railhead surface.
The frame further includes a pair of longitudinal direction frame members extending in the longitudinal direction of the rail and arranged side by side at an interval in the transverse direction of the rail, and a pair of transverse direction frame members extending in the transverse direction of the rail to connect the pair of longitudinal direction frame members and arranged in parallel. The rotation driving part includes a rotation coupling plate, the lifting part includes an installation plate, and the rotation coupling plate is rotatably coupled to the installation plate in close contact with each other. The rotation coupling plate has an arc-shaped movement slot, a coupling pin having one end fixed to the installation plate passes through the movement slot, and as the rotation driving part rotates, the coupling pin moves along the movement slot. A locking handle is provided at the other end of the coupling pin to fix the rotated state of the rotation driving part after the rotation driving part rotates in the transverse direction of the rail. The frame includes a rail insert member that is formed of a cylindrical member extending in the longitudinal direction of the rail and is to be inserted into a concave part formed in the grooved rail. The frame includes a magnetic base by which the railhead surface grinding device is to be attached to the rail by magnetism when the magnetic base, in use, is brought into close contact with the rail by a user and is magnetized by an operation lever operated by a user.
The railhead surface grinding device may further include a displacement sensor to measure a perpendicular displacement occurring when, in use, a position of the grinding stone is moved down as grinding of the railhead surface proceeds.
The frame may include a handle for conveyance to allow a user to move the railhead surface grinding device to a desired place and install the railhead surface grinding device.
According to the present invention, there is also provided a railhead surface grinding method, as defined by claim 4, for grinding a railhead surface of a grooved rail using a railhead surface grinding device according to claim 1, railhead surface grinding method including: coupling and installing the railhead surface grinding device on the rail, and rotating the grinding stone by operation of the rotation driving part to grind the railhead surface by the grinding stone, wherein the rotation driving part gives a vertical force to the grinding stone while moving down in the perpendicular direction to the rail along the lifting part; grinding of the railhead surface is performed while moving the lifting part in the transverse direction of the rail along the horizontal movement frame member; grinding of the railhead surface is performed while moving the horizontal movement frame member in the longitudinal direction of the rail.

[Advantageous Effects]

The railhead surface grinding device of the present invention, in use, grinds the railhead surface while controlling to uniformly maintain a vertical force (a grinding force) by automatically moving down the grinding stone, and exerts a very advantageous effect in that the railhead surface grinding device precisely grinds the rail to a desired extent by measuring the perpendicular displacement using the displacement sensor.
As the railhead surface grinding device of the present invention, in use, rotates the rotation driving part at a necessary angle on the two sides of transverse direction, grinding is performed according to the curved shape of the curved railhead surface by bringing the grinding stone into close contact with the upper railhead surface in response to the upper railhead surface having a curved gradient in transverse direction. Accordingly, there is a superior effect in greatly improving the grinding quality of the rail. The railhead surface grinding device according to the invention can be stably fixed and installed on a grooved rail using the rail insert member.
Optionally, when the handle for conveyance is provided, there is a preferable effect in that the railhead surface grinding device can be moved to a desired place and conveniently used.
According to the invention, means for fixing and installing on the rail are formed of a magnetic base capable of magnetism shift (on/off of magnetism). In this case, an advantage is that it is possible to effectively prevent damage from occurring on the railhead surface in the course of installing the railhead surface grinding device on the rail.

[Description of Drawings]

FIGS. 1 and 2 each are schematic perspective view showing a railhead surface grinding device according to an embodiment of the invention in different viewing directions.
FIG. 3 is a schematic transverse side view of the railhead surface grinding device shown in FIGS. 1 and 2 when viewed in a direction of the arrow B of FIG. 1.
FIG. 4 is a schematic transverse side view of the railhead surface grinding device shown in FIGS. 1 and 2 when viewed in a direction of the arrow C of FIG. 1.
FIGS. 5 and 6 each are schematic exploded perspective views showing the exploded configuration of the railhead surface grinding device shown in FIG. 1 in different viewing directions.
FIGS. 7 and 8 each are schematic perspective views showing a frame extracted from the railhead surface grinding device of the invention in different viewing directions.
FIG. 9 is a schematic perspective view of a frame provided with a horizontal movement frame member in the railhead surface grinding device of the invention.
FIG. 10 is a schematic perspective view showing that the horizontal movement frame member of the frame of FIG. 9 is moved in longitudinal direction.
FIG. 11 is a schematic perspective view showing only a horizontal movement frame member to which a lifting part is coupled in the railhead surface grinding device of the invention.
FIG. 12 is a schematic perspective view showing that the lifting part of FIG. 11 is moved in transverse direction along the horizontal movement frame member.
FIGS. 13 and 14 each are schematic perspective views showing only that a rotation driving part provided with a grinding stone is coupled to a lifting part in different viewing directions, as extracted from a railhead surface grinding device of the invention.
FIGS. 15 to 17 each are schematic perspective views corresponding to FIG. 13 showing grinding by the railhead surface grinding device installed such that the grinding stone is placed in close contact with the railhead surface.
FIGS. 18 to 20 each are schematic longitudinal direction front views of the condition shown in FIGS. 15 to 17 when viewed in a direction of the arrow D.

[Best Mode]

Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings. For reference, in the specification, a direction in which a train travels in longitudinal direction is referred to as "forward", and the contrary direction is referred to as "rearward". In addition, "longitudinal direction" as used herein refers to a direction in which a rail extends along, and "transverse direction" or the term "transverse" in transverse cross section refers to a direction that is horizontally perpendicular to the longitudinal direction.
FIGS. 1 and 2 each are schematic perspective views showing a railhead surface grinding device 100 according to an embodiment of the present invention in different viewing directions. FIG. 3 is a schematic transverse side view of the railhead surface grinding device 100 shown in FIGS. 1 and 2 when viewed in a direction of the arrow B of FIG. 1. FIG. 4 is a schematic transverse side view of the railhead surface grinding device 100 shown in FIGS. 1 and 2 when viewed in a direction of the arrow C of FIG. 1. FIGS. 5 and 6 each are schematic exploded perspective views showing the exploded configuration of the railhead surface grinding device 100 of the present invention shown in FIG. 1 in different viewing directions. The arrow A indicated in the accompanying drawings represents forward in longitudinal direction.
The railhead surface grinding device 100 according to the present invention includes a grinding stone 5 that grinds the railhead surface 200 by rotation, a rotation driving part 4 that performs rotation driving of the grinding stone 5, a lifting part 3 that moves the rotation driving part 4 up and down, and a frame 2 to which the lifting part 3 is coupled and which is coupled to the rail 200 to install the railhead surface grinding device 100 on the rail 200.
First, the configuration of the frame 2 is described in detail. FIGS. 7 and 8 each are schematic perspective views showing only the extracted frame 2 in different viewing directions. For convenience, a horizontal movement frame member 22 is omitted in FIGS. 7 and 8.
The frame 2 includes a pair of longitudinal direction frame members 28 extending in longitudinal direction and arranged side by side at an interval in transverse direction, and a transverse direction frame member 27 extending in transverse direction to connect the pair of longitudinal direction frame members 28. The two transverse direction frame members 27 are arranged in parallel.
The frame 2 is a member that is coupled to the rail 200 to install the railhead surface grinding device 100 on the rail 200. Accordingly, in the present invention, the frame includes a magnetic base 25 that is attached to the rail 200 to faithfully perform its function. When a user puts the railhead surface grinding device 100 on the rail 200, the magnetic base 25 comes into close contact with the railhead surface 200. When the user operates an operation lever 251 to activate the magnetic base 25 that is then magnetized, the magnetic base 25 is firmly attached to the rail 200 by magnetism. The frame 2 is strongly coupled to the rail 200 using the magnetic base 25, and accordingly the railhead surface grinding device 100 is stably fixed and installed on the rail 200. Particularly, using the magnetic base 25, damage of the rail 200 can be effectively prevented in fixed and installing the railhead surface grinding device 100 on the rail 200.
In the case of the embodiment shown in the drawings, although two magnetic bases 25 are each provided on the transverse direction frame members 27, the position at which the magnetic base 25 is provided may change. When rail grinding is finished and it is necessary to separate the railhead surface grinding device 100 from the rail or move the railhead surface grinding device 100, the user may demagnetize the magnetic base 25 through manipulation of the operation lever 251.
The frame 2 may further include a side surface contact part 26 that comes into close contact with the side railhead surface 200. The side surface contact part 26 may be installed on the lower surface of the frame 2. When the frame 2 is put on the rail 200, the side surface contact part 26 comes into close contact with the side railhead surface 200. The side surface contact part 26 effectively prevents the railhead surface grinding device 100 from moving in transverse direction when the railhead surface grinding device 100 is installed on the rail 200. Accordingly, even though an unexpected transverse force acts on the railhead surface grinding device 100, the railhead surface grinding device 100 can stably maintain the coupled state to the rail 200. Preferably, two or more ones of side surface contact part 26 are provided in longitudinal direction.
As illustrated in the drawings, the railhead surface grinding device 100 of the present invention can be also applied to a grooved rail having a concave part 210 on the upper railhead surface 200. For this case, the frame 2 further includes a rail insert member 23. The rail insert member 23 has a cylindrical shape extending in longitudinal direction so that the rail insert member 23 is inserted into the concave part 210 of the grooved rail. Multiple rail insert members 23 may be each installed at the front and rear of the frame 2 in longitudinal direction. In case that the frame 2 includes the rail insert member 23, the railhead surface grinding device 100 of the present invention can be fixed and installed on the grooved rail very stably, firmly and safely without instability such as transverse direction movement or twist. Accordingly, the railhead surface grinding device 100 of the present invention can be very usefully used in the grooved rail, and the railhead surface grinding device 100 of the present invention has good universality with a wide range of applications.
The grinding device may further include a cable carrier 29 having a predefined width in transverse direction on the longitudinal direction frame member 28 of the frame 2, on which many cables necessary to operate the railhead surface grinding device 100 are placed in good order. Through the installation configuration of the cable carrier 29, many cables do not get tangled and are placed in good order. In the railhead surface grinding device 100 the frame 2 may include a handle 21 for conveyance. In case that the handle 21 for conveyance is provided, the user can position the railhead surface grinding device 100 at a rail part requiring grinding by freely moving/conveying the railhead surface grinding device 100 using the handle 21. In the related art, the rail grinding device is installed on a train, so there is inconvenience because it is necessary to drive the large scale train for local surface grinding of the rail. However, when the handle 21 for conveyance is provided, the user can easily move the railhead surface grinding device 100 to a desired place and install and use the railhead surface grinding device 100. Accordingly, it can be used very conveniently at a local place requiring rail grinding without driving the large scale train.
In the grinding device 100, the frame 2 may include a linear driver to move the horizontal movement frame member 22 in longitudinal direction. In FIG. 7, the reference number 280 is a rotation driving shaft 280 provided in the linear driver to move the horizontal movement frame member 22 in longitudinal direction by power, and the reference number 281 is a motor 281 provided to perform rotation driving of the rotation driving shaft 280. The frame 2 has the horizontal movement frame member 22 coupled and installed thereon, and the horizontal movement frame member 22 is coupled and installed on the longitudinal direction frame member 28 and moves in longitudinal direction. The longitudinal direction frame member 28 is provided with the linear driver including the rotation driving shaft 280 and the motor 281. As illustrated in the drawing, when the motor 281 operates in a state that one end of the horizontal movement frame member 22 is coupled to the rotation driving shaft 280, the rotation driving shaft 280 rotates and accordingly the horizontal movement frame member 22 moves in longitudinal direction. When the horizontal movement frame member 22 moves in longitudinal direction by the linear driver provided in the frame 2, through this, the grinding operation may be continuously performed on the railhead surface while moving the grinding stone 5 at a desired speed, and if necessary, at a regular speed in longitudinal direction. Accordingly, efficiency of the grinding operation is greatly improved.
However, the linear driver including the rotation driving shaft 280 and the motor 281 as described above is only an example of the component provided to move the horizontal movement frame member 22 in longitudinal direction. Accordingly, the longitudinal direction movement of the horizontal movement frame member 22 may be made by any other component. For example, the rotation driving shaft 280 may be rotated in hand-operated manner by the operator's manipulation of a lever instead of the motor of the linear driver. The horizontal movement frame member 22 may be moved in longitudinal direction in many other manners.
FIG. 9 is a schematic perspective view of the frame 2 provided with the horizontal movement frame member 22, and FIG. 10 is a schematic perspective view of the frame 2 showing that the horizontal movement frame member 22 is moved in longitudinal direction. In FIG. 10, the dotted line shows the horizontal movement frame member 22 before movement.
The frame 2 includes the horizontal movement frame member 22 that moves in longitudinal direction. The horizontal movement frame member 22 is a member extending in transverse direction with a length that is equal to or larger than the transverse direction width of the rail. The lifting part 3 is coupled to the horizontal movement frame member 22, and the rotation driving part 4 and the grinding stone 5 are coupled to the lifting part 3. Accordingly, when the horizontal movement frame member 22 is coupled to the frame 2 and moves in longitudinal direction, the grinding stone 5 continuously performs a grinding operation on the railhead surface while moving in longitudinal direction accordingly.
Describing the configuration and installation structure of the horizontal movement frame member 22 in detail, as illustrated in the drawing, the horizontal movement frame member 22 is a member extending in transverse direction and its two ends are each coupled to the pair of longitudinal direction frame members 28. In a state that the horizontal movement frame member 22 is coupled to longitudinal direction frame member 28, the horizontal movement frame 22 is moveable in longitudinal direction.
For a longitudinal direction movement of the horizontal movement frame 22, one of the pair of longitudinal direction frame members 28 may be provided with the linear driver including the rotation driving shaft 280 and the motor 281. In this case, one end of the horizontal movement frame member 22 is coupled with the rotation driving shaft 280, and when the motor 281 operates, the rotation driving shaft 280 rotates, and the horizontal movement frame member 22 moves in longitudinal direction while maintaining the installed state on the longitudinal direction frame members 28 at each of the two ends.
The lifting part 3 is coupled to the horizontal movement frame member 22 moveably in transverse direction. That is, the lifting part 3 is coupled and installed on the horizontal movement frame member 22, and the lifting part 3 in the coupled state to the horizontal movement frame member 22 can move in transverse direction along the horizontal movement frame member 22. FIG. 11 is a schematic perspective view showing only the horizontal movement frame member 22 to which the lifting part 3 is coupled, and FIG. 12 is a schematic perspective view of the horizontal movement frame member 22 alone showing that the lifting part 3 is moved in transverse direction along the horizontal movement frame member 22. In FIG. 12, the dotted line shows the horizontal movement frame member 22 before movement.
The configuration in which the lifting part 3 moves in transverse direction along the horizontal movement frame member 22 may be implemented by various methods. However, in the embodiment shown in the drawing, the horizontal movement frame member 22 includes a transverse direction movement shaft 220, and the lifting part 3 is coupled with the transverse direction movement shaft 220. When the user rotates the transverse direction movement shaft 220 by manipulation of a movement shaft regulation lever 221, the lifting part 3 moves in transverse direction along the horizontal movement frame member 22 accordingly. The rotation driving part 4 provided with the grinding stone 5 is coupled to the lifting part 3, and as the lifting part 3 moves in transverse direction along the horizontal movement frame member 22 as described above, the grinding stone 5 changes in transverse direction position.
In allowing the lifting part 3 to move in transverse direction along the horizontal movement frame member 22, the transverse direction movement shaft 220 may be rotated by a motor, and it is preferred to precisely control the transverse direction movement of the lifting part 3 little by little. That is, as in the embodiment described above, it is possible to precise control the rotation of the transverse direction movement shaft 220 as much as necessary by the user's manual manipulation of the movement shaft regulation lever 221. Particularly, when the transverse direction movement shaft 220 and the movement shaft regulation lever 221 as illustrated above are used to move the lifting part 3 in transverse direction along the horizontal movement frame member 22, the user can adjust the position of the grinding stone 5 as much as necessary very deliberately and precisely to perform the grinding operation according to the curved rail transverse cross-sectional profile.
In the railhead surface grinding device 100 of the present invention, the rotation driving part 4 provided with the grinding stone 5 is coupled to the lifting part 3. FIGS. 13 and 14 each are schematic perspective views showing only that the rotation driving part 4 provided with the grinding stone 5 is coupled to the lifting part 3 in different viewing directions.
As illustrated in the drawings, the grinding stone 5 is installed at the lower end of the rotation driving part 4, and the rotation driving part 4 is coupled to the lifting part 3 to move up and down in perpendicular direction along the lifting part 3. The rotation driving part 4 includes a rotation motor to rotate the grinding stone 5. The grinding stone 5 grinds the railhead surface while rotating in contact with the railhead surface.
The lifting part 3 is a member extending in perpendicular direction. The rotation driving part 4 is coupled to the lifting part 3, and moves up and down as much as necessary in perpendicular direction along the lifting part 3. As illustrated in the drawings, a perpendicular rotation shaft is installed at the lifting part 3, and when the perpendicular rotation shaft is rotated by a driving device such as a motor in a state that the rotation driving part 4 is coupled to the perpendicular rotation shaft the rotation driving part 4 in coupled state to the lifting part 3 moves up and down in perpendicular direction along the lifting part 3.
As the rotation driving part 4 is coupled to the lifting part 3 to move up and down in perpendicular direction, the grinding stone 5 grinds the railhead surface in close contact with the railhead surface with a proper vertical force (grinding force) for grinding of the railhead surface by the downward movement of the rotation driving part 4.
The railhead surface grinding device 100 according to the present invention has a coupling configuration of the rotation driving part 4 and the lifting part 3 so that the rotation driving part 4 only can rotate within a desired range at a predefined angle on the two sides of transverse direction. As shown in FIGS. 13 and 14, the rotation driving part 4 includes a rotation coupling plate 40 and the lifting part 3 includes an installation plate 30. Accordingly, when the rotation coupling plate 40 is rotatably coupled to the installation plate 30 in close contact with each other, the rotation driving part 4 is coupled and installed on the lifting part 3. Although not shown in the drawings, a coupling axis is provided between the rotation driving part 4 and the lifting part 3 so that the rotation driving part 4 may rotate around the coupling axis.
In the rotation of the rotation driving part 4 at a predefined angle of transverse direction from perpendicular direction, the following configuration may be provided to limit the rotation range to a necessary extent and fix and maintain the rotated state of the rotation driving part 4. In the embodiment shown in the drawings, the rotation coupling plate 40 has an arc-shaped movement slot 41. A coupling pin 42 passes through the movement slot 41. One end of the coupling pin 42 is fixed to the installation plate 30. A locking handle 44 is provided at the other end of the coupling pin 42. When the rotation coupling plate 40 comes into close contact with the installation plate 30 and the coupling pin 42 passes through the movement slot 41 into unlocked state of the locking handle 44, as the rotation driving part 4 rotates around the coupling axis at a necessary angle in transverse direction, the coupling pin 42 moves along the movement slot 41. After the rotation driving part 4 is positioned by rotation at a desired angle, when the locking handle 44 is placed in locked state, the coupling pin 42 does not move along the movement slot 41 any longer. Accordingly, the rotation driving part 4 is fixed.
In this instance, the locking handle 44 may be formed in pressure type. That is, when the rotation driving part 4 is in non-rotatable state, i.e., locked state, the locking handle 44 strongly brings the rotation coupling plate 40 into close contact with the installation plate 30, and on the contrary, when the rotation driving part 4 is in rotatable state, i.e., unlocked state, the locking handle 44 does not push the rotation coupling plate 40 against the installation plate 30 any longer. In locking state of the locking handle 44, a stopper member is inserted into the movement slot 41 to prevent the coupling pin 42 from moving within the movement slot 41. In unlocking state of the locking handle 44, the stopper member is not inserted into the movement slot 41 any longer to allow the coupling pin 42 to freely move along the movement slot 41.
According to this configuration, there are advantages that it is very easy to limit the rotation range of the rotation driving part 4 to a necessary extent, and it is also very easy to firmly fix and maintain the rotated state of the rotation driving part 4.
FIGS. 15 to 17 each are schematic perspective views corresponding to FIG. 13 showing grinding of the grinding stone 5 placed in close contact with the railhead surface 200, and FIGS. 18 to 20 each are schematic longitudinal direction front views of the condition shown in FIGS. 15 to 17 when viewed in a direction of the arrow D. As described previously, in the railhead surface grinding device 100 according to the invention, the rotation driving part 4 is coupled to the lifting part 3 rotatably on the two sides of transverse direction, and as shown in FIGS. 15 to 17, for the part at which the upper railhead surface 200 has a curved gradient in transverse direction, the grinding stone 5 is inclined by the rotation of the rotation driving part 4 in transverse direction from perpendicular direction, and accordingly the grinding stone 5 comes into close contact with the upper railhead surface to conform to the curved gradient of the upper railhead surface and grinds according to the curve shape of the curved railhead surface.
The railhead surface grinding device 100 may include a displacement sensor 8. As illustrated in FIGS. 13 and 14, the displacement sensor 8 may be provided on the lifting part 3. In a state that the rotation driving part 4 and the grinding stone 5 are coupled to the lifting part 3, when subjected to a predefined vertical force, the grinding stone 5 automatically moves down and grinds the railhead surface. When the position of the grinding stone 5 is moved down as grinding of the railhead surface proceeds, the perpendicular displacement measured by the displacement sensor 8 increases accordingly. When the perpendicular displacement measured by the displacement sensor 8 reaches a preset value, it is determined that sufficient grinding is performed, and accordingly the grinding position is changed. The grinding device grinds the railhead surface 200 to a desired extent through perpendicular displacement measurements by the displacement sensor 8, and accordingly exerts an advantage that a precise grinding operation is performed.
In the railhead surface grinding method according to the present invention after the railhead surface grinding device 100 as described above is coupled and installed on the rail, the rotation driving part 4 operates to rotate the grinding stone 5 so that the grinding stone 5 grinds the railhead surface, and the rotation driving part 4 gives a proper vertical force to the grinding stone 5 while moving down in perpendicular direction along the lifting part 3. By measuring, through the displacement sensor 8, the perpendicular displacement occurring due to the position of the grinding stone 5 being moved down as grinding of the railhead surface proceeds, precise control is performed for proper grinding. Grinding of the railhead surface is performed while moving the lifting part 3 in transverse direction along the horizontal movement frame member 22, and the rotation driving part 4 rotates in transverse direction from perpendicular direction to conform to the transverse direction gradient of the railhead surface, enabling the grinding stone 5 to grind the curved part of the railhead surface. The grinding operation is continuously performed while moving the horizontal movement frame member 22 in longitudinal direction.
As noted above, the grinding device according to the invention may grind the railhead surface while controlling to uniformly maintain a vertical force (a grinding force) by automatically moving down the grinding stone 5. Additionally, the grinding device may precisely grind the rail to a desired extent by measuring the perpendicular displacement using the displacement sensor 8. As the railhead surface grinding device 100 of the present invention rotates the rotation driving part 4 at a necessary angle on the two sides of transverse direction, grinding is performed according to the shape of the curved railhead surface by bringing the grinding stone 5 into close contact with the upper railhead surface in response to the upper railhead surface having a curved gradient in transverse direction. Therefore, according to the present invention there is a superior effect in greatly improving the grinding quality of the rail.
The railhead surface grinding device 100 of the present invention includes the rail insert member 23, and using the rail insert member 23, the railhead surface grinding device 100 may be stably fixed and installed on a grooved rail.
The railhead surface grinding device 100 may include the handle 21 for conveyance, and in this case, there is a preferable effect in that the railhead surface grinding device 100 can be moved to a desired place and conveniently used. As the railhead surface grinding device 100 of the present invention is installed using the magnetic base, there is an advantage that damage of the railhead surface can be prevented in the course of installation.

Claims

A railhead surface grinding device (100) for grinding a railhead surface of a grooved rail (200), comprising:
a frame (2) which is to be coupled to the rail (200) to install the railhead surface grinding device (100) on the rail (200);

a horizontal movement frame member (22) which, in use, extends in a transverse direction of the (200), wherein said frame member (22) is coupled to the frame (2) and is adapted to move in a longitudinal direction of the rail (200) along the frame (2);

a lifting part (3) which is coupled to the horizontal movement frame member (22) and is adapted to move in the transverse direction of the rail (200) along the horizontal movement frame member (22), the lifting part (3) to be extending in a perpendicular direction to the rail (200); and

a rotation driving part (4) which is coupled to the lifting part (3) and is moveable up and down in a perpendicular direction to the rail (200) along the lifting part (3), the rotation driving part (4) having a lower end to which a grinding stone (5) is coupled to perform rotation driving of the grinding stone (5),

wherein the rotation driving part (4) is rotatably coupled to the lifting part (3) so as to be rotatable on both sides in the transverse direction of the rail (200), from the perpendicular direction to the rail (200), to incline the grinding stone (5) to come into close contact with the railhead surface to conform to a curved gradient of an upper part of the railhead surface in the transverse direction of the rail (200) and to grind according to the curved shape of the curved railhead surface;

wherein the frame (2) includes a pair of longitudinal direction frame members (28) extending in the longitudinal direction of the rail (200) and arranged side by side at an interval in the transverse direction of the rail (200), and a pair of transverse direction frame members (27) extending in the transverse direction of the rail (200) to connect the pair of longitudinal direction frame members (28) and arranged in parallel;

wherein the rotation driving part (4) includes a rotation coupling plate (40), the lifting part includes an installation plate (30), and the rotation coupling plate (40) is rotatably coupled to the installation plate (30) in close contact with each other;

wherein the rotation coupling plate (40) has an arc-shaped movement slot (41), a coupling pin (42) having one end fixed to the installation plate (30) passes through the movement slot (41), and as the rotation driving part (4) rotates, the coupling pin (42) moves along the movement slot (41);

wherein a locking handle (44) is provided at the other end of the coupling pin (42) to fix the rotated state of the rotation driving part (4) after the rotation driving part (4) rotates in the transverse direction of the rail (200);

wherein the frame (2) includes a rail insert member (23) that is formed of a cylindrical member extending in the longitudinal direction of the rail (200) and is to be inserted into a concave part (210) formed in the grooved rail; and

wherein the frame (2) includes a magnetic base (25) by which the railhead surface grinding device (100) is to be attached to the rail (200) by magnetism when the magnetic base (25), in use, is brought into close contact with the rail (100) by a user and is magnetized by an operation lever (251) operated by a user.
The railhead surface grinding device (100) according to claim 1, further comprising:
a displacement sensor (8) to measure a perpendicular displacement occurring when, in use, a position of the grinding stone (5) is moved down as grinding of the railhead surface proceeds.
The railhead surface grinding device (100) according to claim 1, wherein the frame (2) includes a handle (21) for conveyance to allow a user to move the railhead surface grinding device (100) to a desired place and install the railhead surface grinding device (100).
A railhead surface grinding method for grinding a railhead surface of a grooved rail (200) using a railhead surface grinding device (100) according to claim 1,
the railhead surface grinding method comprising:
coupling and installing the railhead surface grinding device (100) on the rail, and rotating the grinding stone (5) by operation of the rotation driving part (4) to grind the railhead surface by the grinding stone (5),

wherein the rotation driving part (4) gives a vertical force to the grinding stone (5) while moving down in the perpendicular direction to the rail (200) along the lifting part (3);

grinding of the railhead surface is performed while moving the lifting part (3) in the transverse direction of the rail (200) along the horizontal movement frame member (22);

grinding of the railhead surface is performed while moving the horizontal movement frame member (22) in the longitudinal direction of the rail (200).