Bogie frame lifting device

Abstract

To provide a truck frame elevating device capable of easily securing safe and excellent working environment before and after assembling or disassembling a truck frame of a railway vehicle and an axle while highly accurately raising / lowering the truck frame.SOLUTION: A truck frame elevating device 10 incudes positioning pins 311 formed to be engaged with positioning holes DW11 of a truck frame DW from below and raises / lowers the truck frame engaged with the positioning pins between a raised position above a work floor surface and a lowered position. The truck frame elevating device includes an elevating device main body part 1 installed below the work floor surface and an elevating part 2 guided by the elevating device main body part to be raised and lowered between the raised position and a stored position. An upper end part of the elevating part includes a positioning mechanism 3 having a positioning pin mounting part 31 mounted with the positioning pin and a support part 32 supporting the positioning pin to be stored by turning the positioning pin mounting part upside down. When the positioning pin is stored and the elevating part is lowered to the stored position, an upper end surface of the positioning mechanism forms a flat surface with the work floor surface.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a bogie frame lifting / lowering device, and more particularly to a bogie frame lifting / lowering device that lifts and lowers a bogie frame in a railway vehicle. [Background technology]

[0002] Generally, railway vehicles have bogies that run on rails attached to the underframe of the car body. The bogies are equipped with wheel sets that have left and right wheels and are located at the front and rear of the bogie, and bogie frames that are supported by the front and rear wheel sets via axle springs or the like. Traditionally, to ensure the safe running of railway vehicles, bogies have been periodically disassembled into wheel sets and bogie frames for inspection and repair (inspection). Therefore, bogie assembly equipment is required to accurately assemble the wheel sets and bogie frames after inspection and repair.

[0003] For example, the above-mentioned bogie assembling apparatus is disclosed in Patent Document 1. As shown in Fig. 17, the bogie assembling apparatus 100 of Patent Document 1 is characterized in that it is provided with a wheel pawl device 103, a wheelset lifting device 104, a wheelset centering device 105, and a wheelset pressing and bogie frame fitting device 106 in assembling wheelsets 101 and bogie frame 102 of a railway vehicle bogie.

[0004] Specifically, the wheelset 101 is placed on the track, the wheel 101a is locked by the wheel pawl device 103, and the wheelset 101 is lifted by the wheelset lifting device 104 to lift the wheel 101a off the track (rail) 111. Next, the inside of the wheel 101a is pressed by the wheelset center distribution device 105, and the wheels 101a are evenly distributed from the center position in the track width direction. Furthermore, the wheelset pressing and bogie frame insertion device 106 presses the centers of both end faces of the axle to position and fix the wheelset 101, and the bogie frame 102 is then lowered from above to automatically install it onto the wheelset 101.

[0005] As shown in FIG. 18, the wheel axle pressing and bogie frame fitting device 106 has guide pins 107 for fixing the bogie frame provided on the top of a device main body 112 that stands up from the work floor surface FL near each wheel 101a, and is configured to drive the guide pins 107 for fixing the bogie frame in the forward / backward direction (arrow X direction) and the upward / downward direction (arrow Y direction) using a servo motor 108, gears 109, precision ball screws 110, etc., to accurately position the bogie frame 102 and assemble it into the wheel axle 101. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 5-170099 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the wheelset pressing and bogie frame inserting device 106 is installed above the work floor FL near each wheel 101a, and functions as a bogie frame lifting device that receives the bogie frame 102 transported upward by engaging with the bogie frame fixing guide pins 107 and mounts it on the wheelset 101 below. Therefore, after the bogie frame 102 is assembled into the wheelset 101, various tasks such as temporarily attaching a post-inspection / repair traction motor to the bogie frame 102 and properly fastening the axle spring in a compressed state must be performed in the narrow work space where the wheelset pressing and bogie frame inserting device (bogie frame lifting device) 106 is installed, creating a problem of unsafety and a poor working environment. The same problem occurs when the bogie frame inserting device (bogie frame lifting device) 106 is used for disassembling the bogie frame 102 and the wheelset 101.

[0008] In this regard, it is possible to make the wheelset pressing and bogie frame insertion device (bogie frame lifting device) 106 a mobile device that moves the bogie frame 102 away from the bogie after assembling it into the wheelset 101 (see, for example, Figure 4 of Patent Publication No. 2012-86832), but this would result in a problem of the equipment being large-scale, requiring increased installation space and equipment costs.

[0009] The present invention has been made to solve such problems, and aims to provide a bogie frame lifting device that can accurately lift and lower the bogie frame of a railway vehicle and easily ensure a safe and good working environment at least before and after assembling or disassembling the bogie frame and wheel sets. [Means for solving the problem]

[0010] In order to achieve the above object, the bogie frame lifting device according to the present invention has the following configuration. (1) A bogie frame lifting device that includes a positioning pin formed so as to be engageable from below with a positioning hole of a bogie frame of a railway vehicle, and that lifts and lowers the bogie frame engaged with the positioning pin between a raised position above a working floor surface and a lowered position, a lifting device main body installed in a pit formed below the work floor surface; and a lifting section formed to be guided by the lifting device main body and capable of moving up and down between the raised position and a storage position below the lowered position, a positioning mechanism including a positioning pin mounting portion at an upper end of the lifting portion, the positioning pin being mounted facing upward at a position protruding toward the bogie frame, and a support portion that supports the positioning pin so that the positioning pin can be stored by rotating the positioning pin mounting portion 180 degrees in the vertical direction and turning it upside down, The upper end surface of the positioning mechanism is characterized in that when the positioning pin is stored and the lifting section is lowered to the storage position, it forms a flat surface with the work floor surface.

[0011] In the present invention, the device comprises a lifting device main body installed in a pit formed below the work floor surface, and a lifting section guided by the lifting device main body so as to be able to move up and down between an elevated position and a storage position lower than the lowered position, and the upper end of the lifting section is provided with a positioning mechanism having a positioning pin mounting section on which a positioning pin is mounted facing upward in a position that protrudes toward the bogie frame, and a support section that supports the positioning pin so that it can be stored by rotating the positioning pin mounting section 180 degrees vertically and inverting it upside down, and the upper end surface of the positioning mechanism forms a flat surface with the work floor surface when the lifting section is lowered to the storage position with the positioning pin stored.Therefore, for example, when assembling the bogie frame and wheel set, the lifting section is raised to the elevated position with the positioning pin facing upward, and the positioning pin is engaged with the positioning hole of the bogie frame transported by an overhead crane or the like, and the lifting section is then lowered from the elevated position to the lowered position, allowing the bogie frame to be accurately assembled to the wheel set. In addition, when disassembling the bogie frame and wheel axles, the positioning pins can be engaged with the positioning holes in the bogie frame at the lowered position, and then the lifting section can be raised from the lowered position to the raised position, and the bogie frame can be handed over to an overhead crane or the like and transported to an inspection and repair stage or the like.

[0012] Furthermore, when the lifting unit is in the stored position, the upper end surface of the positioning mechanism forms a flat surface with the work floor surface, so when performing various tasks before and after assembling or disassembling the bogie frame and wheel sets, the lifting unit and positioning mechanism do not get in the way even without moving the bogie frame lifting device away from the bogie, providing a wide, flat work space. Even if the lifting unit is lowered to the stored position without turning the positioning pin mounting unit upside down, the positioning pin mounting unit rotates vertically, so there is no risk of injury to the worker's feet being caught between the work floor surface and the positioning pin mounting unit. Therefore, a safe and comfortable work environment can be easily ensured for the worker before and after assembling or disassembling the bogie frame and wheel sets.

[0013] Therefore, according to the present invention, a bogie frame lifting device can be provided that can accurately raise and lower the bogie frame of a railway vehicle and easily ensure a safe and good working environment at least before and after assembling or disassembling the bogie frame and wheel sets.

[0014] (2) In the bogie frame lifting device described in (1), The positioning pin is arranged so as to be engageable with the positioning hole formed in an axle damper seat located near the four corners of the bogie frame, facing the axle box of the wheel set.

[0015] In the present invention, the positioning pins are arranged to be engageable with positioning holes drilled in axle damper seats located near the four corners of the bogie frame, facing the axle boxes of the wheel sets. This allows workers transporting the bogie frame to easily see the axle damper seats located near the four corners of the bogie frame from the outside and easily engage the positioning pins with the positioning holes. Furthermore, the four positioning pins engaged with the positioning holes are located diagonally on the bogie frame, allowing for balanced support of the bogie frame. This allows for more stable and smooth assembly and disassembly of the bogie frame relative to the wheel sets. Furthermore, the positioning holes drilled in the axle damper seats are generally formed with high precision by machining, allowing the bogie frame to be positioned with high precision using the positioning pins, thereby enabling the wheel sets and the bogie frame to be assembled and disassembled with even greater precision and speed.

[0016] Furthermore, after the bogie frame and wheelset are assembled, the positioning pin can be removed from the positioning hole of the bogie frame and stored by utilizing the axle damper gap formed between the axle damper seat on the bogie frame and the axle damper seat on the axle box of the wheelset. That is, the lifting unit is lowered from its lowered position to a removal position where the positioning pin can be removed from the positioning hole within the axle damper gap and stored, and then the positioning pin mounting unit is inverted to store the positioning pin in the support unit. As a result, the operation of storing the positioning pin can be easily performed without using a complex mechanism. Note that when disassembling the bogie frame and wheelset, the above-described operation is reversed to allow the positioning pin to engage with the positioning hole of the bogie frame by utilizing the axle damper gap formed between the axle damper seat on the bogie frame and the axle damper seat on the axle box of the wheelset.

[0017] (3) In the bogie frame lifting device described in (2), The positioning pin mounting portion is characterized in that a polyamide resin member is fixed to a back surface side opposite to the front surface side on which the positioning pin is mounted.

[0018] In the present invention, the polyamide resin member is fixed to the back side of the positioning pin mounting portion, opposite the front side where the positioning pin is mounted. Therefore, after the bogie frame and wheelset are assembled, when the lifting unit is lowered to remove the positioning pin from the positioning hole in the bogie frame, even if the lifting unit is lowered too far and the wheelset axle box comes into contact with the positioning pin mounting portion, the polyamide resin member, which has a low friction coefficient and high wear resistance, comes into contact with the wheelset axle box, promoting vertical rotation of the positioning pin mounting portion and preventing or reducing damage to the positioning mechanism and axle box. This further reduces the burden on the worker when removing and storing the positioning pin from the positioning hole in the bogie frame, thereby improving the safe working environment.

[0019] (4) In the bogie frame lifting device described in (2) or (3), The positioning pins are characterized in that the pin length of the two positioning pins arranged at one diagonal position is longer than the pin length of the two positioning pins arranged at the other diagonal position.

[0020] In the present invention, the pin lengths of the two positioning pins arranged at one diagonal position are longer than the pin lengths of the two positioning pins arranged at the other diagonal position. Therefore, the two positioning pins with longer pin lengths can be engaged with the four positioning holes of the bogie frame first, and the two positioning pins with shorter pin lengths can be engaged later. Furthermore, the two positioning pins with shorter pin lengths can be disengaged from the four positioning holes of the bogie frame first, and the two positioning pins with longer pin lengths can be disengaged later. Therefore, compared to a case where positioning pins with the same pin length are simultaneously engaged with or disengaged from the positioning holes of the bogie frame, more accurate and quick engagement and disengagement can be performed with fewer people. As a result, the efficiency of the work of assembling or disassembling the bogie frame and wheel sets using the positioning pins can be improved.

[0021] (5) In the bogie frame lifting device described in any one of (1) to (4), the positioning mechanism includes an inversion handle for inverting the positioning pin mounting portion upside down relative to the support portion, the inversion handle being located at a position spaced apart from the bogie frame in which the positioning hole is engaged with the positioning pin, The inversion handle is formed so that it can be stored within the support part or in another location when the positioning pin mounting part is inverted upside down.

[0022] In this invention, the positioning mechanism is provided with an inversion handle for inverting the positioning pin mounting portion upside down relative to the support portion, at a position separated from the bogie frame whose positioning hole is engaged with the positioning pin, so that after removing the positioning pin from the positioning hole of the bogie frame, the worker can easily invert the positioning pin mounting portion upside down relative to the support portion by grasping the inversion handle and rotating the positioning pin mounting portion 180 degrees in the vertical direction. Therefore, there is no need to directly grasp the positioning pin mounting portion, and worker safety can be further improved.

[0023] Furthermore, the flipping handle is configured so that it can be stored within the support unit or in another location when the positioning pin mounting unit is inverted upside down. Therefore, the lifting unit can be lowered to the storage position with the positioning pin mounting unit inverted upside down and the flipping handle stored together with the positioning pin within the support unit or stored in another location. When the lifting unit is in the storage position, the upper end surface of the positioning mechanism forms a flat surface with the work floor. Therefore, when performing various tasks before and after assembling or disassembling the bogie frame and wheelset, the flipping handle does not get in the way, and a flat, wide work space is obtained. This prevents workers from tripping over the upper end surface of the positioning mechanism or the through-holes in the work floor, easily ensuring a safe and comfortable work environment.

[0024] (6) In the bogie frame lifting device described in (5), The reversal handle is characterized by having a fixed handle portion fixed to the side of the bogie frame side end portion protruding toward the bogie frame side of the positioning pin mounting portion, and a movable handle portion formed so as to be able to be bent horizontally relative to the fixed handle portion.

[0025] In the present invention, the reversing handle includes a fixed handle portion fixed to the side surface of the bogie frame-side end portion of the positioning pin mounting portion that protrudes toward the bogie frame, and a movable handle portion formed to be bendable in the horizontal direction relative to the fixed handle portion, so that an operator can easily turn the positioning pin mounting portion upside down relative to the support portion by grasping the movable handle portion of the reversing handle and rotating the positioning pin mounting portion 180 degrees in the vertical direction. During this upside-down turning, a load is applied in the vertical direction to the movable handle portion, so the movable handle portion can turn without bending relative to the fixed handle portion.

[0026] Furthermore, since the movable handle is formed so as to be bendable horizontally relative to the fixed handle, after the positioning pin mounting section is inverted upside down relative to the support section, the movable handle can be bent horizontally and easily stored within the support section. In this way, the inversion handle is easy to grasp and store within the support section, so that the positioning pin mounting section can be inverted upside down and the lifting section can be quickly lowered to the storage position with the inversion handle and the positioning pin stored within the support section, making it even easier to ensure a safe and comfortable working environment.

[0027] (7) In the bogie frame lifting device described in (5), The reversing handle is characterized in that it is attached to or detachable from a rotation center shaft that is formed rotatably integrally with the positioning pin mounting portion.

[0028] In the present invention, the inversion handle is attached to or detachably formed on a rotation center shaft that is formed so as to be rotatable integrally with the positioning pin mounting portion, so that an operator can easily invert the positioning pin mounting portion upside down relative to the support portion by grasping the inversion handle attached to the rotation center shaft or by grasping the inversion handle attached to the rotation center shaft and rotating the positioning pin mounting portion 180 degrees in the vertical direction.

[0029] The handle for turning the rotary shaft may be stored in a storage space formed in the support part or in another storage location. Also, an engagement groove for a hexagonal wrench may be formed in the end of the rotary shaft, and the hexagonal wrench may be used as the handle for turning the rotary shaft.

[0030] (8) In the bogie frame lifting device described in any one of (1) to (7), The lifting device main body includes a base to be installed in the pit, a brake-equipped drive motor having an encoder attached to the base, and a drive means connected to the drive motor to move the lifting unit up and down; The drive motor stops the lifting unit above the storage position based on the numerical data of the encoder.

[0031] In the present invention, the main body of the lifting device comprises a base to be installed in the pit, a drive motor with a brake and an encoder attached to the base, and a drive means connected to the drive motor to move the lifting section up and down.The drive motor stops the lifting section above the storage position based on the numerical data of the encoder, so that the work of setting the stop position of the lifting section can be carried out quickly and safely.

[0032]

[0004] In other words, the stop position of the lifting unit can be easily set based on the numerical data of the encoder, eliminating the need for unsafe mechanical adjustments. This makes it possible to further improve the safety and simplification of assembly and disassembly work. For example, the raised position where the positioning pin is engaged with or disengaged from the positioning hole of the bogie frame, the lowered position where the bogie frame and wheel set are assembled or disassembled, and the disengagement position where the positioning pin is disengaged from the positioning hole are all at different heights from the work floor, but because the stop position of the drive motor can be set based on the numerical data of the encoder, these setting operations can be carried out quickly and safely.

[0033] In the storage position, the lifting unit is stopped so that the top surface of the positioning mechanism forms a flat surface with the work floor, so the stop position of the drive motor does not need to be changed. Furthermore, the encoder of the drive motor needs to eliminate accumulated errors. Therefore, in the storage position, the drive motor can be controlled, for example, by a limit switch to uniformly stop the lifting unit and return the encoder to zero, thereby eliminating the accumulated encoder error.

[0034] (9) In the bogie frame lifting device described in (8), The drive means is characterized by comprising a pair of chain drive gears connected to the drive motor via a reducer, and a pair of interlocking chains whose one end connected to the lifting section is meshed with each other by the chain drive gears to be rigidified.

[0035] In the present invention, the drive means includes a pair of chain drive gears connected to the drive motor via a reducer, and a pair of interlocking chains whose ends connected to the lifting unit are meshed with each other by the chain drive gears and rigidified, so that when the drive motor rotates forward, the ends of the interlocking chains rigidified by the chain drive gears extend, allowing the lifting unit to rise. When the drive motor rotates reversely, the ends of the interlocking chains rigidified by the chain drive gears shorten, allowing the lifting unit to fall.

[0036] Therefore, the lifting stroke of the lifting part is determined by the length of one end of the rigidified interlocking chain, and the vertical length of the lifting device main body can be shortened as much as possible. Therefore, the depth of the pit in which the lifting device main body is installed can be made shallower, thereby saving on construction costs, etc. Also, a bogie frame lifting device with a long lifting stroke can be easily installed in an existing pit.

[0037] Furthermore, although the load when the bogie frame is mounted on the positioning mechanism acts on the chain drive gear via one end of the rigidified interlocking chain, the presence of a reducer between the chain drive gear and the drive motor significantly reduces the load on the drive motor. As a result, the bogie frame lifting device that lifts and lowers the heavy bogie frame can be made more compact, allowing for an expansion of the working space.

[0038] (10) In the bogie frame lifting device described in any one of (1) to (9), The lifting device main body includes a rectangular cylindrical fixed guide portion formed below the work floor surface, and the lifting unit includes a rectangular cylindrical movable guide portion formed so as to be insertable into the fixed guide portion, the positioning mechanism is attached to an upper end of the movable guide portion, The axis of the movable guide portion is arranged at a position offset toward the bogie frame with respect to the axis of the fixed guide portion.

[0039] In the present invention, the lifting device main body includes a rectangular cylindrical fixed guide portion formed below the work floor surface, the lifting portion includes a rectangular cylindrical movable guide portion formed to be insertable into the fixed guide portion, the positioning mechanism is attached to the upper end of the movable guide portion, and the axis of the movable guide portion is disposed at a position eccentric to the bogie frame side relative to the axis of the fixed guide portion. This allows the movable guide portion to be moved closer to the bogie frame side by the amount of eccentricity between the axes, thereby reducing the amount of protrusion of the positioning pin mounting portion, which has the positioning pin mounted thereon, toward the bogie frame side relative to the movable guide portion. Furthermore, by reducing the amount of protrusion of the positioning pin mounting portion toward the bogie frame side, the amount of protrusion of the positioning pin mounting portion toward the opposite side of the bogie frame when the positioning pin mounting portion is inverted can be reduced by the amount of protrusion. This allows the positioning mechanism to be formed in a more compact planar size. As a result, when the lifting section is in the stored position, the upper end surface of the compact positioning mechanism forms a flat surface with the work floor surface, so that when performing various tasks before and after assembling or disassembling the bogie frame and wheel sets, the positioning mechanism is even less of an obstacle, ensuring a safe, flat, and spacious work space.

[0040] (11) In the bogie frame lifting device described in (10), the lifting section includes a cylindrical second movable guide section formed to be insertable between the fixed guide section and the movable guide section, an inner wall surface of the second movable guide portion is provided with a second protrusion formed so as to be able to come into contact in the up-down direction with a protrusion protruding from the outer wall surface of the movable guide portion; When the lifting unit is in the stored position, the upper end of the second movable guide unit is at the same height as the work floor surface, The method is characterized in that, while maintaining the second movable guide portion overlapping the fixed guide portion, the upper end of the second movable guide portion is raised above the work floor surface by the convex portion abutting against the second convex portion halfway through the upward movement of the movable guide portion.

[0041] In the present invention, the lifting section includes a second movable guide member inserted between the fixed guide member and the movable guide member, and an inner wall surface of the second movable guide member includes a second protrusion formed to be able to vertically abut against a protrusion protruding from the outer wall surface of the movable guide member. When the lifting section is in the retracted position, the upper end of the second movable guide member is flush with the work floor. While the second movable guide member is overlapped with the fixed guide member, the protrusion and the second protrusion abut against each other during the lifting of the movable guide member, thereby raising the upper end of the second movable guide member above the work floor. This allows the movable guide member and the second movable guide member to be raised and lowered telescopically relative to the fixed guide member, thereby increasing the lifting stroke of the lifting section relative to the lifting device main body and correspondingly reducing the vertical height of the lifting device main body. As a result, the depth of the pit in which the lifting device main body is installed can be reduced, thereby saving construction costs, etc. Furthermore, when the lifting section is in the stored position, the upper end of the second movable guide section is at the same height as the work floor surface, so when performing various tasks before and after assembling or disassembling the bogie frame and wheel set, the second movable guide section does not get in the way, ensuring a safe, flat, and spacious work space.

[0042] (12) In the bogie frame lifting device described in (11), a fixed rail portion that guides a second slide portion, which is fixed to an outer wall surface of the second movable guide portion on the opposite side of the bogie frame, in a vertical direction, on an inner wall surface of the fixed guide portion on the opposite side of the bogie frame; A movable rail portion is fixed to the inner wall surface of the second movable guide portion on the side opposite the bogie frame, and guides a slide portion fixed to the outer wall surface of the movable guide portion on the side opposite the bogie frame in the vertical direction.

[0043] In the present invention, a fixed rail portion is fixed to the inner wall surface of the fixed guide portion on the opposite side to the bogie frame, and the fixed rail portion is fixed to the inner wall surface of the second movable guide portion on the opposite side to the bogie frame, and the movable rail portion is fixed to the inner wall surface of the second movable guide portion on the opposite side to the bogie frame, and the movable rail portion is fixed to the inner wall surface of the second movable guide portion on the opposite side to the bogie frame, and this makes it possible to further increase the lifting stroke of the movable guide portion relative to the fixed guide portion and to further increase the amount of eccentricity of the axis of the movable guide portion toward the bogie frame with respect to the axis of the fixed guide portion. As a result, the lifting position at which the bogie frame is received or delivered can be made higher and the eccentric load on the movable guide portion can be reduced, allowing the bogie frame to be lifted and lowered stably.

[0044] Furthermore, since the amount of protrusion of the positioning pin mounting portion toward the bogie frame can be reduced, the amount of protrusion of the positioning pin mounting portion toward the side opposite the bogie when the positioning pin mounting portion is turned upside down can be reduced, and the planar size of the positioning mechanism can be made even more compact. As a result, when the lifting unit is in the stored position, the positioning mechanism does not get in the way even more when performing various tasks before and after assembling or disassembling the bogie frame and wheel sets, and a safe, flat, and large work space can be secured. [Effects of the Invention]

[0045] According to the present invention, a bogie frame lifting device can be provided that can accurately lift and lower the bogie frame of a railway vehicle and easily ensure a safe and good working environment at least before and after assembling or disassembling the bogie frame and wheel sets. [Brief explanation of the drawings]

[0046] [Figure 1] 1 is a side view of an example of a bogie that is assembled or disassembled by the bogie frame lifting device according to the present embodiment. FIG. [Figure 2] FIG. 1 is a plan view of an example of a bogie assembly stage on which a bogie frame lifting device according to the present embodiment is installed. [Figure 3] FIG. 3 is a view taken along the arrow A in FIG. 2. [Figure 4]4A and 4B are views taken along arrow B in FIG. 3, in which (A) shows a schematic diagram of the state in which the lifting unit has been raised to the raised position and received the bogie frame, and (B) shows a schematic diagram of the state in which the lifting unit has been lowered to the lowered position and the bogie frame has been assembled to the wheel set. [Figure 5] 10A and 10B are detailed cross-sectional views of the lowered position and the positioning pin disengaged position. [Figure 6] FIG. 10 is a perspective view of the positioning mechanism when moved from a raised position to a lowered position. [Figure 7] 10 is a perspective view of the positioning mechanism with the positioning pin mounting portion turned upside down at the position where the positioning pin is removed. FIG. [Figure 8] FIG. 10 is a perspective view of the positioning mechanism in the retracted position. [Figure 9] 1 is a perspective view of a state in which a lifting unit is raised to a raised position in the bogie frame lifting device according to the present embodiment. FIG. [Figure 10] 1 is a perspective view of a state in which a lifting unit is lowered to a storage position in the bogie frame lifting device according to the present embodiment. FIG. [Figure 11] 11 is a cross-sectional view taken along the line CC in FIG. [Figure 12] 12 is a cross-sectional view taken along the line DD in FIG. 11. [Figure 13] 10A and 10B are cross-sectional views of the bogie frame lifting device according to this embodiment, in which (A) shows a cross-sectional view of the storage position, (B) shows a cross-sectional view of the pin upward inversion position in which the orientation of the positioning pin is inverted upward, and (C) shows a cross-sectional view of the raised position. [Figure 14] FIG. 4 is a flowchart illustrating operation steps when assembling the bogie frame and wheel sets of the bogie frame lifting device according to the present embodiment. [Figure 15] 10A and 10B are perspective views of a first modified example of the positioning mechanism in the bogie frame lifting device according to the present embodiment, in which FIG. 10A shows a perspective view in a state where the positioning pin is facing upward, and FIG. 10B shows a perspective view in a state where the positioning pin is facing downward. [Figure 16] FIG. 10 is a perspective view of a second modified example of the positioning mechanism in the bogie frame lifting and lowering device according to the present embodiment, with the positioning pin facing upward. [Figure 17] FIG. 1 is a front view of a carriage assembly device described in Patent Document 1. [Figure 18] FIG. 18 is a front view of a wheel set pressing and bogie frame inserting device (corresponding to a bogie frame lifting device) in the bogie assembling device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0047] Next, a bogie frame lifting device representing one aspect of this embodiment will be described in detail with reference to the drawings. Specifically, an example of a bogie to be assembled or disassembled by the bogie frame lifting device according to this embodiment and an example of the overall configuration of a bogie assembly stage will be briefly described, and then the configuration and operation method of this bogie frame lifting device will be described in detail. After that, modified examples (first modified example and second modified example) of the positioning mechanism used in the bogie frame lifting device according to this embodiment will be specifically described.

[0048] <Configuration of the bogie and bogie assembly stage that are assembled or disassembled by the bogie frame lifting device> First, an example of a bogie to be assembled or disassembled by the bogie frame lifting device according to this embodiment and an example of the overall configuration of a bogie assembly stage will be briefly described with reference to Figs. 1 to 3. Fig. 1 shows a side view of an example of a bogie to be assembled or disassembled by the bogie frame lifting device according to this embodiment. Fig. 2 shows a plan view of an example of a bogie assembly stage on which the bogie frame lifting device according to this embodiment is installed. Fig. 3 shows a view seen from the arrow A shown in Fig. 2.

[0049] (Truck configuration) As shown in FIG. 1, the bogie DS (one example) to be assembled or disassembled using the bogie frame lifting device 10 according to this embodiment includes wheel sets RJ having left and right wheels SR and arranged at the front and rear of the bogie DS, and a bogie frame DW supported by the front and rear wheel sets RJ via axle springs JBN or the like. The wheel sets RJ are equipped with axle boxes JB that support both ends of the axles SJ to which the wheels SR are connected. Axle springs JBN are attached to the axle boxes JB on both the front and rear sides of the axles SJ. The axle boxes JB also have axle damper seats JB1 formed directly above the axles SJ to which axle dampers JD are attached.

[0050] The bogie frame DW also has a side rib DW1 extending in the longitudinal direction of the vehicle (rail direction) and a cross rib DW2 connected to the center of the side rib DW1 and extending in the lateral direction of the vehicle (sleeper direction), with the side rib DW1 and cross rib DW2 forming a substantially H-shape. Axle damper seats DW10 are formed near the four corners of the bogie frame DW (near both longitudinal ends of the side rib DW1). The axle damper seats DW10 of the bogie frame DW are formed horizontally at a position protruding outward from the upper end of the side rib DW1 toward the outside of the vehicle. A positioning hole DW11 is drilled in the center of the axle damper seat DW10, penetrating it in the vertical direction. The positioning hole DW11 is formed with high precision by machining.

[0051] Additionally, air springs KB are attached to both lateral ends of the cross beam DW2. The bogie DS supports the car body underframe (not shown) via the air springs KB and other components. Various components, such as the traction motor SD that rotates the axle SJ, are attached inward of the side beam DW1 of the cross beam DW2. The wheel set RJ and bogie frame DW are disassembled approximately periodically and inspected, and undergo any necessary repairs. At that time, the traction motor and other components are also inspected and repaired.

[0052] (Carriage assembly stage configuration) As shown in Figures 2 and 3, the bogie assembly stage 50 is equipped with equipment for assembling post-inspection and repair wheel sets RJ and bogie frames DW to accurately assemble the bogies DS. Rails RL, which carry in the post-inspection and repair wheel sets RJ and carry out the assembled bogies DS, are laid on the work floor FL of the bogie assembly stage 50. The rails RL are equipped with divided rails RL1 that are formed so as to be able to move up and down and that are positioned to position the front and rear wheel sets RJ.

[0053] A wheelbase centering device 5 is installed at the center of the split rail RL1. The wheelbase centering device 5 has a pair of support rollers arranged at the front and rear, and is a device that positions the axle center of the wheelset RJ by placing the tread of the wheel SR on the pair of support rollers. After the wheel SR of the wheelset RJ after inspection and repair is moved to its positioning position on the split rail RL1, the split rail RL1 is lowered, and the wheel SR moves onto the support rollers, and the axle center of the wheelset RJ is positioned in a predetermined position. Four wheelbase centering devices 5 are installed in locations corresponding to the wheelsets RJ arranged at the front and rear of the bogie DS, so by positioning each wheel SR, the distance between the axle centers (wheelbase) can be adjusted to the correct state.

[0054] Additionally, a wheel back centering device 6 is disposed inside the divided rail RL1. The wheel back centering device 6 is a device that pushes the wheel SR from the back side to the front side to position the axle center in the left-right direction (sleeper direction). Four wheel back centering devices 6 are provided corresponding to the wheel sets RJ arranged at the front and rear of the bogie DS, so that by pressing each wheel SR, it is possible to position the axle center in the left-right direction (sleeper direction) for each of the front and rear wheel sets RJ.

[0055] Additionally, bogie frame lifting devices 10, axle box suspension devices 4, load application devices 7, and an operation panel 8 are disposed outside the split rail RL1. The bogie frame lifting devices 10 will be described in detail later. Four axle box suspension devices 4 are provided, and are disposed between the bogie frame lifting devices 10 and the split rail RL1. Each axle box suspension device 4 has support portions that abut the lower end surfaces of the axle boxes JB of the front and rear wheel sets RJ, and the support portions are configured to be vertically movable by means of a screw shaft or the like. By raising the axle boxes JB using these axle box suspension devices 4, the wheel sets RJ can be raised to a predetermined height, allowing inspection and maintenance of gearboxes and the like to be performed. The axle box suspension devices 4 are installed in a pit PT formed below the working floor surface FL, and when the support portions are lowered, the upper end surfaces of the support portions form a flat surface with the working floor surface FL.

[0056] Two load applying devices 7 are provided at symmetrical positions with respect to the rail RL, and are installed outside the bogie frame lifting device 10. The load applying device 7 is a device that, after the bogie frame DW and the wheel set RJ are assembled, rotates a load applying section 71, which is erected in an inverted L shape above the work floor surface FL, toward the bogie, and the load applying section 71 presses against the receiving seat DW21 of the air spring KB of the bogie frame DW. The bogie DS has been raised to a predetermined height by the axle box suspension devices 4, and the load applying section 71 applies a load equivalent to the passenger load during vehicle operation to deflect the axle springs JBN and the like. Then, the traction motor SD, which has been temporarily attached to the bogie frame DW, is properly fixed and connected to the gear on the wheel set side.

[0057] The operation panel 8 is provided with operation switches, a display screen, control devices, etc. required for operating the above-mentioned devices (for example, the axle box support device 4, the wheelbase centering device 5, the wheel back centering device 6, the load application device 7, and the bogie frame lifting device 10). In the bogie assembly stage 50 equipped with the above-mentioned facilities, the inspected and repaired wheel sets RJ and the bogie frame DW can be assembled and the bogie DS can be assembled with high precision.

[0058] <Configuration and operation method of the bogie frame lifting device> Next, the configuration and operation method of the bogie frame lifting device according to this embodiment will be described in detail with reference to FIGS. 1 to 14. FIG. 4 is a view taken along arrow B in FIG. 3, where (A) is a schematic diagram of the lifting unit raised to the raised position to receive the bogie frame, and (B) is a schematic diagram of the lifting unit lowered to the lowered position to assemble the bogie frame to the wheel set. FIG. 5 shows detailed cross-sectional views at the lowered position and the positioning pin release position. FIG. 6 is a perspective view of the positioning mechanism from the raised position to the lowered position. FIG. 7 is a perspective view of the positioning mechanism in a state where the positioning pin mounting section is inverted upside down at the position where the positioning pin is released. FIG. 8 is a perspective view of the positioning mechanism in the stored position. FIG. 9 is a perspective view of the bogie frame lifting device according to this embodiment in a state where the lifting unit is raised to the raised position. FIG. 10 is a perspective view of the bogie frame lifting device according to this embodiment in a state where the lifting unit is lowered to the stored position. FIG. 11 shows a cross-sectional view taken along CC in FIG. 10. Fig. 12 shows a DD cross section shown in Fig. 11. Fig. 13 shows cross sections of the bogie frame lifting device according to this embodiment, where (A) shows a cross section at the stored position, (B) shows a cross section at the pin upward reversal position where the orientation of the positioning pin is reversed upward, and (C) shows a cross section at the raised position. Fig. 14 shows a flowchart illustrating the operation steps of the bogie frame lifting device according to this embodiment.

[0059] (Overall composition) As shown in Figures 1 to 14, the bogie frame lifting device 10 of this embodiment is equipped with a positioning pin 311 formed so as to be able to engage from below with a positioning hole DW11 of the bogie frame DW of the railway vehicle TS, and is a bogie frame lifting device 10 that raises and lowers the bogie frame DW engaged with the positioning pin 311 between an elevated position K1 above the working floor surface FL and a lowered position K2.

[0060] Since the bogie frame DW is a heavy object, it is transported using, for example, an overhead crane. The wheelset RJ, which is also a heavy object, is transported on rails RL. After moving the wheelset RJ to the split rails RL1 described above, it is positioned by the wheelbase centering device 5 and the wheelback centering device 6. The positioned wheelset RJ may be assembled to the bogie frame DW in that state, but considering workability after assembly, it may also be assembled to the bogie frame DW in a state where it is lifted slightly above the work floor FL by the axle box support device 4. When disassembling the bogie DS into the bogie frame DW and the wheelset RJ, the wheelset RJ of the bogie DS is also positioned by the wheelbase centering device 5 and the wheelback centering device 6 after moving it to the split rails RL1 described above.

[0061] The bogie frame lifting device 10 also includes a lifting device main body 1 installed in a pit PT formed below the working floor surface FL, and a lifting unit 2 formed so as to be able to move up and down between an elevated position K1 and a storage position K4 below a lowered position K2, guided by the lifting device main body 1. Here, a chain mechanism, which will be described later, is used as the driving means 123 for raising and lowering the lifting unit 2, but various other mechanisms such as a hydraulic cylinder mechanism or a ball screw mechanism may also be used.

[0062] 5 to 8, the upper end 2J of the lifting section 2 is provided with a positioning mechanism 3 including a positioning pin mounting section 31 on which a positioning pin 311 is mounted facing upward at a position that protrudes toward the bogie frame side, and a support section 32 that supports the positioning pin mounting section 31 so that the positioning pin 311 can be stored by rotating the positioning pin mounting section 31 up and down by 180 degrees and turning it upside down. Here, the positioning pin 311 has a tapered tip, but the entire positioning pin may be tapered to reduce friction when the positioning pin 311 is removed from the positioning hole DW11. A seat on which the bogie frame DW is placed is formed at the base end of the positioning pin 311, and the lower part of the seat is fixed with a screw to a surface side 31a of a bogie frame side end 312 of the positioning pin mounting section 31 that protrudes toward the bogie frame side.

[0063] The positioning pin mounting portion 31 is formed in a substantially rectangular parallelepiped shape that is long in the rail width direction, and is formed so that it can be turned upside down relative to the support portion 32, which has substantially the same length in the rail width direction, via a rotation center shaft 313 connected to the positioning pin mounting portion 31. The positioning pin mounting portion 31 is formed so that, when the positioning pin mounting portion 31 is turned upside down, an end face of a bogie frame side end 312 of the positioning pin mounting portion 31 and an end face of an anti-bogie frame side end 321 of the support portion 32 are substantially flush with each other in the rail width direction, and an end face of an anti-bogie frame side end 316 of the positioning pin mounting portion 31 and an end face of a bogie frame side end 323 of the support portion 32 are substantially flush with each other. The anti-bogie frame side end 316 of the positioning pin mounting portion 31 is formed to have a narrower width in the rail direction than the bogie frame side end 312.

[0064] The support portion 32 is also provided with a base plate 322 that abuts against the back surface 31b of the positioning pin mounting portion 31 when the positioning pin 311 faces upward. The base plate 322 is formed with a notched groove 322a that avoids interference with the positioning pin 311 when the positioning pin mounting portion 31 is turned upside down, and is also formed with an escape hole 322b through which the end portion 316 of the positioning pin mounting portion 31 on the side opposite to the bogie frame passes. The support portion 32 is also equipped with a bearing portion 314 for the pivot shaft 313. The bearing portion 314 is preferably a graphite-containing metal bushing that has excellent load-bearing capacity.

[0065] Furthermore, when the lifting unit 2 is lowered to the storage position K4 with the positioning pin 311 stored, the upper end surface 3J of the positioning mechanism 3 forms a flat surface with the work floor surface FL. A flat cover member 325 that is substantially flush with the back surface 31b of the upside-down positioning pin mounting unit 31 is attached to the upper end of the support unit 32. The flat cover member 325 and the back surface 31b of the upside-down positioning pin mounting unit 31 form the upper end surface 3J of the positioning mechanism 3. Here, "flat surface" means that when the lifting unit 2 is lowered to the storage position K4, the upper end surface 3J of the positioning mechanism 3 and the work floor surface FL form a flat state, and the difference in level between them is small enough to prevent an operator from tripping.

[0066] With the above-described configuration, the bogie frame lifting device 10 can, for example, when assembling the bogie frame DW and the wheel set RJ, raise the lifting unit 2 to the raised position K1 with the positioning pin 311 facing upward, engage the positioning hole DW11 of the bogie frame DW transported by an overhead crane or the like with the positioning pin 311, and then lower the lifting unit 2 from the raised position K1 to the lowered position K2, thereby assembling the bogie frame DW to the wheel set RJ with high precision. Also, when disassembling the bogie frame DW and the wheel set RJ, after engaging the positioning pin 311 with the positioning hole DW11 of the bogie frame DW at the lowered position K2, raise the lifting unit 2 from the lowered position K2 to the raised position K1, and hand over the bogie frame DW to an overhead crane or the like for transport to an inspection / repair stage or the like.

[0067] Furthermore, after the bogie frame DW is assembled to the wheel set RJ, the lifting unit 2 is lowered to a removal position K3 where the positioning pin 311 is removed from the positioning hole DW11 of the bogie frame DW, and the positioning pin mounting portion 31 is turned upside down, and with the positioning pin 311 stored within the support portion 32, the lifting unit 2 can be lowered to a storage position K4.

[0068] Furthermore, at the storage position K4 of the lifting unit 2, the upper end surface 3J of the positioning mechanism 3 forms a flat surface with the work floor surface FL. Therefore, when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, the lifting unit 2 and the positioning mechanism 3 do not get in the way and a flat, wide work space can be obtained without having to move the bogie frame lifting device 10 in a direction away from the bogie DS. Furthermore, even if the lifting unit 2 is lowered to the storage position K4 without forgetting to turn the positioning pin mounting part 31 upside down, the positioning pin mounting part 31 rotates vertically, so the worker's feet will not be caught between the work floor surface FL and the positioning pin mounting part 31 and will not be injured. Therefore, a safe and good work environment can be easily ensured for the worker before and after assembling or disassembling the bogie frame DW and the wheel set RJ.

[0069] Therefore, according to the present bogie frame lifting device 10, the bogie frame DW of the railway vehicle TS can be raised and lowered with high precision, and a safe and favorable working environment can be easily ensured at least before and after assembling or disassembling the bogie frame DW and the wheel set RJ.

[0070] (positioning mechanism) Furthermore, as shown in Figures 1 to 5, in the present bogie frame lifting device 10, it is preferable that the positioning pin 311 is arranged so as to be able to engage with a positioning hole DW11 drilled in an axle damper seat DW10 located opposite the axle box JB of the wheel set RJ and near the four corners of the bogie frame DW.

[0071] In this case, the axle damper seats DW10 arranged near the four corners of the bogie frame DW can be easily seen from the outside by an operator transporting the bogie frame DW using an overhead crane or the like. Therefore, the operator can easily engage the positioning pins 311 with the positioning holes DW11 of the bogie frame DW.

[0072] Furthermore, the four positioning pins 311 engaged with the positioning holes DW11 drilled in the axle damper seat DW10 are arranged at diagonal positions on the bogie frame DW, thereby enabling the bogie frame DW to be supported in a well-balanced manner. This allows the wheel set RJ and the bogie frame DW to be assembled or disassembled more stably and smoothly. Furthermore, the positioning holes DW11 drilled in the axle damper seat DW10 are generally formed with high precision by machining. Therefore, the bogie frame DW can be positioned with high precision by the positioning pins 311, allowing the wheel set RJ and the bogie frame DW to be assembled or disassembled with even greater precision and speed.

[0073] Furthermore, after the bogie frame DW and the wheel set RJ are assembled, the positioning pin 311 can be removed from the positioning hole DW11 of the bogie frame DW and stored by utilizing the gap for the axle damper formed between the axle damper seat DW10 in the bogie frame DW and the axle damper seat JB1 in the axle box JB of the wheel set RJ.

[0074] That is, the lifting unit 2 is lowered from the lowered position K2 to a removal position K3 where the positioning pin 311 can be removed from the positioning hole DW11 within the range of the axle damper gap and stored, and then the positioning pin mounting portion 31 is inverted to easily store the positioning pin 311 in the support portion 32. As a result, the storing operation of storing the positioning pin 311 can be easily performed without using a complex mechanism. When disassembling the bogie frame DW and the wheelset RJ, the above-mentioned operation can be reversed to allow the positioning pin 311 to engage with the positioning hole DW11 of the bogie frame DW, using the axle damper gap formed between the axle damper seat DW10 of the bogie frame DW and the axle damper seat JB1 of the axle box JB of the wheelset RJ.

[0075] 5 to 8, in the bogie frame lifting / lowering device 10, it is preferable that a polyamide resin member 315 formed in a plate shape is fixed to the back side 31b of the positioning pin mounting portion 31, which is opposite to the front side 31a on which the positioning pin 311 is mounted. The polyamide resin member 315 can be produced, for example, by forming MC nylon (registered trademark) or the like into a plate shape.

[0076] In this case, after the bogie frame DW and the wheel set RJ are assembled, when the lifting unit 2 is lowered to remove the positioning pin 311 from the positioning hole DW11 of the bogie frame DW, even if the lifting unit 2 is lowered too far and the axle box JB of the wheel set RJ comes into contact with the positioning pin mounting portion 31, the polyamide resin member 315, which has a small friction coefficient and high wear resistance, will come into contact with the axle box JB of the wheel set RJ, thereby promoting the vertical rotation of the positioning pin mounting portion 31 and preventing or reducing damage to the positioning mechanism 3 and the axle box JB. This further reduces the burden on the worker when removing and storing the positioning pin 311 from the positioning hole DW11 of the bogie frame DW, thereby improving the safe working environment.

[0077] Furthermore, as shown in Figures 2 to 4, in the present bogie frame lifting device 10, it is preferable that the positioning pins 311 are formed so that the pin length α1 of the two positioning pins 311a, 311c arranged at one diagonal position is longer than the pin length α2 of the two positioning pins 311b, 311d arranged at the other diagonal position.

[0078] In this case, the worker transporting the bogie frame DW can first engage the four positioning holes DW11 of the bogie frame DW with the two positioning pins 311a, 311c with the long pin length α1, and then engage the two positioning pins 311b, 311d with the short pin length α2. Also, the worker can first disengage the two positioning pins 311b, 311d with the short pin length α2 from the four positioning holes DW11 of the bogie frame DW, and then disengage the two positioning pins 311a, 311c with the long pin length α1. Therefore, compared to a case where the positioning holes DW11 of the bogie frame DW are simultaneously engaged with or disengaged from the positioning pins 311 all having the same pin length, the positioning holes DW11 can be engaged with or disengaged more accurately and quickly with fewer workers. As a result, the efficiency of the work of assembling or disassembling the bogie frame DW to the wheel set RJ using the positioning pins 311 can be improved.

[0079] Furthermore, as shown in Figures 5 to 8, in the present bogie frame lifting device 10, the positioning mechanism 3 is provided with an inversion handle 33 for inverting the positioning pin mounting portion 31 upside down relative to the support portion 32, at a position spaced apart from the bogie frame DW in which the positioning hole DW11 is engaged with the positioning pin 311, and it is preferable that the inversion handle 33 is formed so as to be able to be stored within the support portion 32 when the positioning pin mounting portion 31 is inverted upside down.

[0080] In this case, the positioning mechanism 3 is provided with the reversing handle 33 for reversing the positioning pin mounting portion 31 upside down relative to the support portion 32, at a position separated from the bogie frame DW in which the positioning hole DW11 is engaged with the positioning pin 311, so that after releasing the positioning pin 311 from the positioning hole DW11 of the bogie frame DW, the worker can easily reversing the positioning pin mounting portion 31 upside down relative to the support portion 32 by gripping the reversing handle 33 and rotating the positioning pin mounting portion 31 180 degrees in the vertical direction. Therefore, there is no need to directly grip the positioning pin mounting portion 31, which further improves the safety of the worker.

[0081] Furthermore, the reversing handle 33 is formed so as to be retractable within the support section 32 when the positioning pin mounting section 31 is turned upside down. Therefore, the lifting section 2 can be lowered to the storage position K4 with the positioning pin mounting section 31 turned upside down and the reversing handle 33 and the positioning pin 311 stored within the support section 32. When the lifting section 2 is in the storage position K4, the upper end surface 3J of the positioning mechanism 3 forms a flat surface with the work floor FL. Therefore, when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, the reversing handle 33 does not get in the way, and a large, flat work space can be obtained. This makes it easy to ensure a safe and favorable work environment.

[0082] Furthermore, in the present bogie frame lifting device 10, it is preferable that the reversing handle 33 comprises a fixed handle portion 33a fixed to the side of the bogie frame side end portion 312 that protrudes toward the bogie frame side of the positioning pin mounting portion 31, and a movable handle portion 33b formed so as to be able to be bent horizontally relative to the fixed handle portion 33a.

[0083] Here, movable handle 33b is connected to fixed handle 33a via a hinge member that is formed so that it can be bent only horizontally. The hinge member also has a locking member that holds fixed handle 33a and movable handle 33b in a straight line, and when an operator grasps movable handle 33b and applies an external force that bends it horizontally, the locked state of the locking member is automatically released.

[0084] In this case, the operator can easily turn the positioning pin mounting part 31 upside down relative to the support part 32 by grasping the movable handle part 33b of the turning handle 33 and turning the positioning pin mounting part 31 up and down by 180 degrees. During this turning upside down, a load is applied to the movable handle part 33b in the vertical direction, so that the movable handle part 33b can turn without bending relative to the fixed handle part 33a.

[0085] Furthermore, since movable handle portion 33b is formed so as to be bendable in the horizontal direction relative to fixed handle portion 33a, after positioning pin mounting portion 31 is turned upside down relative to support portion 32, movable handle portion 33b can be bent in the horizontal direction and easily stored in support portion 32. Note that support portion 32 has storage space 324 formed between base plate 322 and cover member 325 to store fixed handle portion 33a and the folded movable handle portion 33b. Also, cover plate 313c is fixed to fixed handle portion 33a so as to be flush with cover member 325 when stored.

[0086] In this case, the inversion handle 33 is easy to grasp and store within the support part 32, so that the positioning pin mounting part 31 can be inverted upside down, and the inversion handle 33 together with the positioning pin 311 can be stored within the support part 32, and the lifting part 2 can be quickly lowered to the storage position K4, making it even easier to ensure a safe and good working environment.

[0087] (Lifting mechanism) As shown in FIGS. 3 and 9 to 11, in the bogie frame lifting device 10, the lifting device main body 1 includes a base 11 installed in the pit PT, a brake-equipped drive motor 121 equipped with an encoder and mounted on the base 11, and a drive means 123 connected to the drive motor 121 for moving the lifting unit 2 up and down. The drive motor 121 preferably stops the lifting unit 2 above the storage position K4 based on the numerical data of the encoder. The lifting mechanism 12 includes the drive motor 121, a reducer 122, and a drive means 123, which will be described later. Here, the drive means 123 uses a chain mechanism, which will be described later, but various other mechanisms, such as a hydraulic cylinder mechanism or a ball screw mechanism, may also be used. The drive motor 121 can be a normal AC motor, or a servo motor.

[0088] In this case, for example, the stop position of the lifting unit 2 can be easily set based on the numerical data of the encoder using a programmable logic controller (PLC) or the like, eliminating the need for unsafe mechanical adjustments. This further improves safety and simplification of the work of assembling or disassembling the bogie frame DW and the wheel set RJ. For example, the raised position K1 where the positioning pin 311 is engaged with or disengaged from the positioning hole DW11 of the bogie frame DW, the lowered position K2 where the bogie frame DW and the wheel set RJ are assembled or disassembled, and the disengaged position K3 where the positioning pin 311 is disengaged from the positioning hole DW11 are all at different heights from the work floor surface FL. However, because the stop position of the drive motor 121 can be set based on the numerical data of the encoder, the setting work can be performed quickly and safely.

[0089] At the storage position K4, the lifting unit 2 is stopped so that the upper end surface 3J of the positioning mechanism 3 forms a flat surface with the work floor surface FL. Therefore, once the stop position of the drive motor 121 is set, it does not need to be changed. Furthermore, the drive motor 121 needs to eliminate accumulated encoder errors. Therefore, at the storage position K4, the encoder of the drive motor 121 can be reset to zero by, for example, a limit switch 16, thereby eliminating the accumulated encoder errors. Here, the limit switch 16 is attached to the lower part of the fixed guide 13 of the lifting device main body 1, and is activated by a dog 215 attached to the lower end of the movable guide 21 of the lifting unit 2 when the lifting unit 2 descends to the storage position K4.

[0090] Furthermore, in the bogie frame lifting device 10, the drive means 123 preferably includes a pair of chain drive gears 123a connected to the drive motor 121 via a reducer 122, and a pair of interlocking chains 123b whose one end sides 123c connected to the lifting section 2 are meshed with each other by the chain drive gears 123a and rigidified. The interlocking chains 123b before being rigidified are flexible, and therefore are stored in a wound state in separate chain storage cases 14 installed on the base 11.

[0091] In this case, when the drive motor 121 rotates forward, one end 123c of the interlocking chain 123b, which has been stiffened by the chain drive gear 123a, extends, thereby lifting the lifting unit 2. When the drive motor 121 rotates backward, one end 123c of the interlocking chain 123b, which has been stiffened by the chain drive gear 123a, shortens, thereby lowering the lifting unit 2.

[0092] Therefore, the lifting stroke of the lifting unit 2 is determined by the length of one end side 123c of the rigidified interlocking chain 123b, and the vertical length of the lifting device main body 1 can be shortened as much as possible. Therefore, the depth of the pit PT in which the lifting device main body 1 is installed can be made shallow, thereby saving on construction costs, etc. Also, the bogie frame lifting device 10 with a long lifting stroke can be easily installed in an existing pit PT.

[0093] Furthermore, the load when the bogie frame DW is mounted on the positioning mechanism 3 acts on the chain drive gear 123a via one end side 123c of the rigidified meshing chain 123b, but since the reducer 122 is interposed between the chain drive gear 123a and the drive motor 121, the load on the drive motor 121 can be significantly reduced by the reducer 122. Therefore, the bogie frame lifting device 10 that lifts and lowers the bogie frame DW, which is a heavy object, can be made more compact, and the working space can be expanded.

[0094] Moreover, in the present bogie frame lifting device 10, the lifting device main body 1 is provided with a square tubular fixed guide section 13 formed below the work floor surface FL, the lifting section 2 is provided with a square tubular movable guide section 21 formed so as to be insertable into the fixed guide section 13, and the positioning mechanism 3 is preferably attached to an upper end section 21J of the movable guide section 21, and an axis 21JS of the movable guide section 21 is disposed at a position eccentric to the bogie frame side with respect to the axis 13JS of the fixed guide section 13. A support section 32 of the positioning mechanism 3 is fastened to a top plate 211 formed at the upper end section 21J of the movable guide section 21.

[0095] The eccentricity β between the shaft centers 21JS, 13JS is set so as to minimize the gap between the movable guide portion 21 and the fixed guide portion 13. The fixed guide portion 13 is installed at the upper end portion 171 of the gear case 17 that houses the chain drive gear 123a. The gear case 17 is connected to the chain storage case 14. The upper end portion 13J of the fixed guide portion 13 is formed below the work floor surface FL. The lower end portion (bottom plate) 212 of the movable guide portion 21 is connected to the rigidified one end side 123c of the interlocking chain 123b.

[0096] In this case, the movable guide unit 21 can be brought closer to the bogie frame side, and the amount by which the positioning pin mounting unit 31, to which the positioning pin 311 is attached, protrudes toward the bogie frame side relative to the movable guide unit 21 can be reduced. Furthermore, the amount by which the positioning pin mounting unit 31 protrudes toward the bogie frame side when the positioning pin mounting unit 31 is turned upside down can be reduced by the amount by which the positioning pin mounting unit 31 protrudes toward the bogie frame side. This allows the planar size of the positioning mechanism 3 to be made more compact. As a result, when the lifting unit 2 is stored in position K4, the upper end surface 3J of the compact positioning mechanism 3 forms a flat surface with the work floor surface FL. Therefore, when various operations are performed before and after assembling or disassembling the bogie frame DW and the wheel set RJ, the positioning mechanism 3 does not get in the way any more, and a safe, flat, and wide work space can be secured.

[0097] 9 to 12, in the bogie frame lifting device 10, the lifting section 2 is provided with a second movable guide section 22 formed so as to be insertable between the fixed guide section 13 and the movable guide section 21, and an inner wall surface 223 near the upper end of the vertical center portion of the second movable guide section 22 is provided with a second protrusion 224 formed so as to be able to abut in the vertical direction against a protrusion 214 protruding from the outer wall surface 213 near the bottom of the movable guide section 21, and it is preferable that the upper end section 22J of the second movable guide section 22 is formed to be flush with the working floor surface FL at the storage position K4 of the lifting section 2. It is also preferable that the second movable guide section 22 is kept overlapping the fixed guide section 13, and the protrusion 214 abuts against the second protrusion 224 from midway through the lifting of the movable guide section 21, thereby lifting the upper end section 22J of the second movable guide section 22 above the working floor surface FL. A through hole FL1 through which the second movable guide portion 22 passes is formed in the work floor surface FL.

[0098] In this case, the movable guide portion 21 and the second movable guide portion 22 can be raised and lowered telescopically relative to the fixed guide portion 13, and the lifting stroke of the lifting portion 2 relative to the lifting device main body 1 can be increased. The vertical height of the lifting device main body 1 can be reduced by the amount of the increased lifting stroke of the lifting portion 2. As a result, the depth of the pit PT in which the lifting device main body 1 is installed can be reduced, thereby saving on construction costs, etc. Furthermore, the bogie frame lifting device 10 with an even longer lifting stroke can be easily installed in an existing pit PT.

[0099] Furthermore, when the lifting unit 2 is in the storage position K4, the upper end 22J of the second movable guide unit 22 is at the same height as the work floor surface FL, so that the second movable guide unit 22 does not get in the way when performing various tasks after assembling the bogie frame DW and the wheel set RJ, ensuring a safe, flat, and wide work space. Note that when the lifting unit 2 is in the storage position K4, the stopper portion 228 formed at the lower end of the second movable guide unit 22 abuts against the stopper portion 18 formed at the upper end 171 of the gear case 17. In addition, the outer wall surface of the lower part of the second movable guide part 22 (at a position a predetermined distance above the lower end) is provided with a fourth convex part 225 formed so as to be able to abut in the vertical direction against a third convex part 15 protruding from the inner wall surface a predetermined distance below the upper end of the fixed guide part 13, and when the first movable guide part 21 and the second movable guide part 22 rise too high above the predetermined raised position K1, the third convex part 15 abuts against the fourth convex part 225, thereby preventing excessive rise.

[0100] Furthermore, as shown in Figures 4 and 12, in the present bogie frame lifting device 10, it is preferable that a fixed rail portion 19 is fixed to the inner wall surface 13N on the opposite bogie frame side of the fixed guide portion 13, which guides the second slide portion 227 fixed to the outer wall surface 22G on the opposite bogie frame side of the second movable guide portion 22 in the up and down direction, and that a movable rail portion 226 is fixed to the inner wall surface 22N on the opposite bogie frame side of the second movable guide portion 22, which guides the slide portion 216 fixed to the outer wall surface 21G on the opposite bogie frame side of the movable guide portion 21 in the up and down direction.

[0101] In this case, it is possible to further increase the lifting stroke of the movable guide part 21 relative to the fixed guide part 13, while further increasing the amount of eccentricity β by which the axis 21JS of the movable guide part 21 is eccentric toward the bogie frame side relative to the axis 13JS of the fixed guide part 13. Therefore, it is possible to further increase the lifting position K1 at which the bogie frame DW is received or handed over, and it is also possible to reduce the eccentric load on the movable guide part 21, allowing the bogie frame DW to be lifted and lowered stably.

[0102] Furthermore, since the amount of protrusion of the positioning pin mounting portion 31 toward the bogie frame side can be reduced, when the positioning pin mounting portion 31 is turned upside down, the amount of protrusion of the positioning pin mounting portion 31 toward the side opposite the bogie can be reduced, and the planar size of the positioning mechanism 3 can be made even more compact. As a result, at the storage position K4 of the lifting unit 2, the positioning mechanism 3 does not get in the way even more when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, and a safe, flat, and wide working space can be ensured.

[0103] (Operation method of the bogie frame lifting device) The bogie frame lifting device 10 operates according to the flowchart shown in Fig. 14. It is provided with a movable guide portion 21, a second movable guide portion 22, and a fixed guide portion 13, and will be described in the following embodiment. Here, the operating method when assembling the bogie frame DW and the wheel set RJ will be described.

[0104] First, in the upward reversal step (S1) of the positioning pin 311, the movable guide unit 21 is raised from the storage position K4 to reversal the positioning pin 311 upward. Here, the drive motor 121 is rotated forward to extend one end 123c of the rigidified interlocking chain 123b, and the positioning mechanism 3 is raised from the position at the work floor surface FL shown in FIGS. 10, 11, and 13(A) to the pin-upward reversal position shown in FIG. 13(B). Then, the worker grasps the reversal handle 33 of the positioning mechanism 3, which has been raised above the work floor surface FL, and rotates the positioning pin mounting unit 31 180 degrees vertically to reversal the positioning pin 311 upward. At this time, only the movable guide unit 21 is raised, and the upper end 22J of the second movable guide unit 22 is maintained at the same height as the work floor surface FL.

[0105] Next, in the step (S2) of receiving the bogie frame DW, the movable guide member 21 is raised to a raised position K1 where the bogie frame DW is received. Here, the drive motor 121 is rotated forward to further extend one end side 123c of the rigidified interlocking chain 123b, and the positioning mechanism 3 is raised to the raised position K1 shown in FIGS. 4(A), 9, and 13(C). As the movable guide member 21 is raised, the convex portion 214 of the movable guide member 21 and the second convex portion 224 of the second movable guide member 22 come into contact with each other, thereby moving the upper end portion 22J of the second movable guide member 22 above the work floor surface FL. The worker transports the bogie frame DW using an overhead crane or the like, and engages the positioning pin 311 with the positioning hole DW11 of the bogie frame DW.

[0106] Next, in the step (S3) of assembling the bogie frame DW and the wheel set RJ, with the positioning pins 311 engaged with the positioning holes DW11 of the bogie frame DW, the movable guide member 21 is lowered to a lowered position K2 where the bogie frame DW is assembled to the wheel set RJ. Here, the drive motor 121 is reversed to shorten one end side 123c of the rigidified interlocking chain 123b, and the positioning mechanism 3 is lowered to the lowered position K2 shown in Figures 4(B), 5, and 6. During the lowering of the movable guide member 21, the stopper portion 228 of the second movable guide member 22 abuts against the stopper portion 18, so that the upper end portion 22J of the second movable guide member 22 stops at the same height as the work floor surface FL.

[0107] Next, in the step (S4) of removing and storing the positioning pin 311, the movable guide unit 21 is lowered to a removal position K3 where the positioning pin 311 is removed from the positioning hole DW11 of the bogie frame DW, and then the positioning pin 311 is inverted downward and stored in the support unit 32. Here, the drive motor 121 is reversed to further shorten one end side 123c of the rigidified interlocking chain 123b, and the positioning mechanism 3 is lowered to the removal position K3 shown in FIGS. 5 and 7. Thereafter, the operator grasps the reversing handle 33 of the positioning mechanism 3 and rotates the positioning pin mounting unit 31 up and down 180 degrees to invert the positioning pin 311 downward. In this state, the upper end surface 3J of the positioning mechanism 3 becomes a substantially flat surface.

[0108] Next, in the storage step (S5) of the lifting unit 2, the movable guide unit 21 is lowered to a storage position K4 where the upper end surface 3J of the positioning mechanism 3 forms a flat surface with the work floor surface FL. Here, the drive motor 121 is reversed to further shorten one end side 123c of the rigidified interlocking chain 123b, and the positioning mechanism 3 is lowered to the storage position K4 shown in Figures 8, 10, 11, and 13(A). The drive motor 121 stops when the dog 215 attached to the lower end of the movable guide unit 21 activates the limit switch 16 attached to the lower part of the fixed guide unit 13. As a result, the upper end surface 3J of the positioning mechanism 3 becomes flush with the work floor surface FL, forming a flat surface with the work floor surface FL.

[0109] <Modification> It goes without saying that the present invention can be modified in various aspects without departing from the gist of the present invention. Here, modified examples (modified examples 1 and 2) of the positioning mechanism of the bogie frame lifting device according to this embodiment will be specifically described with reference to Figs. 15 and 16. Fig. 15 is a perspective view of a first modified example of the positioning mechanism in the bogie frame lifting device according to this embodiment, where (A) shows a perspective view in a state where the positioning pins are facing upward, and (B) shows a perspective view in a state where the positioning pins are facing downward. Fig. 16 shows a perspective view of a second modified example of the positioning mechanism in the bogie frame lifting device according to this embodiment, where the positioning pins are facing upward.

[0110] 5 to 8, the positioning mechanism 3 of the bogie frame lifting device 10 according to this embodiment includes a reversing handle 33 for reversing the positioning pin mounting portion 31 upside down relative to the support portion 32, at a position spaced apart from the bogie frame DW in which the positioning hole DW11 is engaged with the positioning pin 311, and the reversing handle 33 is formed so as to be able to be stored within the support portion 32 when the positioning pin mounting portion 31 is in a state in which it is turned upside down. The reversing handle 33 includes a fixed handle portion 33a fixed to a side surface of the bogie frame side end portion 312 of the positioning pin mounting portion 31 that protrudes toward the bogie frame side, and a movable handle portion 33b formed so as to be able to be bent in the horizontal direction relative to the fixed handle portion 33a. However, the reversing handle 33 does not need to be limited to the above-described form.

[0111] (First Modification) 15, the reversing handle 33B may be formed so as to be attachable to a rotation center shaft 313B formed so as to be rotatable integrally with the positioning pin mounting portion 31. Specifically, the reversing handle 33B may be fastened to one end side of the rotation center shaft 313B formed so as to be rotatable integrally with the positioning pin mounting portion 31, and disposed parallel to the positioning pin mounting portion 31.

[0112] In this case, the operator can easily invert the positioning pin mounting portion 31 upside down relative to the support portion 32B by grasping the inversion handle 33B attached to the rotation center shaft 313B and rotating the positioning pin mounting portion 31 180 degrees in the vertical direction. The inversion handle 33B is operated with the cover member 325B attached to the support portion 32B detached. With the positioning pin mounting portion 31 inverted upside down, the inversion handle 33B is stored in the storage space 324B of the support portion 32B. Thereafter, by attaching the cover member 325B to the support portion 32B, the upper end surface of the positioning mechanism 3B can be formed into a flat surface.

[0113] (Second Modification) For example, as shown in FIG. 16 , the reversing handle 33C may be detachably attached to a pivot shaft 313C that is integrally formed with the positioning pin mounting portion 31 and rotatable therewith. Specifically, an engagement groove 313C2 may be formed on one end of the pivot shaft 313C that is integrally formed with the positioning pin mounting portion 31 and rotatable therewith, and the reversing handle 33C may be detachably attached to the engagement groove 313C2. The reversing handle 33C may be stored in a storage space 324C formed in the support portion 32C, or may be stored in another storage location. Furthermore, an engagement groove 313C2 for a hexagonal wrench may be formed on an end 313C1 of the pivot shaft 313C, for example, so that a hexagonal wrench can be used as the reversing handle 33C.

[0114] In this case, the operator can easily turn the positioning pin mounting part 31 upside down relative to the support part 32C by gripping the reversing handle 33C attached to the engagement groove 313C2 of the rotation center shaft 313C and rotating the positioning pin mounting part 31 by 180 degrees in the vertical direction. In addition, by forming an engagement through-hole in the cover member 325C attached to the support part 32C, the reversing handle 33C can be operated without removing the cover member 325C.

[0115] Note that, to prevent the positioning pin mounting portion 31 from rotating up and down when the positioning pin 311 is removed from the positioning hole DW11, the support portion 32C may be provided with a friction plate 313C3 that comes into sliding contact with the outer peripheral surface of the rotation center shaft 313C. Also, a finger hook groove 312a may be formed on the end surface of the bogie frame side end portion 312 of the positioning pin mounting portion 31. In this case, when rotating the positioning pin mounting portion 31 in the upward direction of the positioning pin 311 from the state in which the positioning pin 311 is stored, there is no need to bother using the reversing handle 33C.

[0116] (others) Here, the case where the reversing handles 33, 33B, 33C are used as means for reversing the positioning pin mounting portion 31 upside down relative to the support portion 32 has been described, but it is also possible to reverse the positioning pin mounting portion 31 upside down by mounting a driving means such as a drive motor or a driving cylinder inside the movable guide portion 21 and connecting it to the positioning pin mounting portion 31 or the rotation center shaft 313 without using the reversing handles 33, 33B, 33C. Furthermore, the bogie frame lifting devices 10, 10B, 10C can be used for various purposes other than as lifting devices for assembling or disassembling the bogie frame DW and the wheel set RJ, and can be used, for example, as a lifting device for lifting and lowering a single bogie frame DW.

[0117] <Action and effect> The bogie frame lifting devices 10, 10B, and 10C according to the present embodiment described above in detail include a lifting device main body 1 installed in a pit PT formed below the work floor surface FL, and a lifting section 2 formed so as to be able to move up and down between a raised position K1 and a storage position K4 below a lowered position K2 while being guided by the lifting device main body 1, and an upper end 2J of the lifting section 2 is provided with a positioning pin mounting section 31 having a positioning pin 311 mounted facing upward at a position protruding toward the bogie frame DW side, and support sections 32, 32B, and 32C which rotate the positioning pin mounting section 31 up and down by 180 degrees and turn it upside down to support the positioning pin 311 so as to be able to be stored therein. The upper end surfaces 3J of the positioning mechanisms 3, 3B, 3C form a flat surface with the work floor surface FL when the lifting unit 2 is lowered to the storage position K4 with the positioning pins 311 stored. Therefore, for example, when assembling the bogie frame DW and the wheel set RJ, the lifting unit 2 is raised to the raised position K1 with the positioning pins 311 facing upward, and the positioning holes DW11 of the bogie frame DW transported by an overhead crane or the like are engaged with the positioning pins 311, and then the lifting unit 2 is lowered from the raised position K1 to the lowered position K2, so that the bogie frame DW can be assembled to the wheel set RJ with high precision. Furthermore, when disassembling the bogie frame DW and the wheel axle RJ, the positioning pin 311 is engaged with the positioning hole DW11 of the bogie frame DW at the lowered position K2, and then the lifting section 2 is raised from the lowered position K2 to the raised position K1, and the bogie frame DW is handed over to an overhead crane or the like, and transported to an inspection and repair stage or the like.

[0118] Furthermore, at the storage position K4 of the lifting unit 2, the upper end surfaces 3J of the positioning mechanisms 3, 3B, and 3C form a flat surface with the work floor surface FL. Therefore, when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, the lifting unit 2 and the positioning mechanisms 3, 3B, and 3C do not get in the way and a wide, flat work space can be obtained without having to move the bogie frame lifting devices 10, 10B, and 10C away from the bogie DS. Furthermore, even if the lifting unit 2 is lowered to the storage position K4 without turning the positioning pin mounting portion 31 upside down, the positioning pin mounting portion 31 rotates vertically, so the worker's feet will not be caught between the work floor surface FL and the positioning pin mounting portion 31 and be injured. Therefore, a safe and favorable work environment can be easily ensured for the worker before and after assembling or disassembling the bogie frame DW and the wheel set RJ.

[0119] Therefore, according to this embodiment, it is possible to provide bogie frame lifting devices 10, 10B, 10C that can accurately raise and lower the bogie frame DW of a railway vehicle TS and easily ensure a safe and good working environment at least before and after assembling or disassembling the bogie frame DW and the wheel set RJ.

[0120] Furthermore, according to this embodiment, the positioning pins 311 are disposed so as to be engageable with the positioning holes DW11 bored in the axle damper seats DW10 located opposite the axle boxes JB of the wheelset RJ and near the four corners of the bogie frame DW. This allows workers transporting the bogie frame DW to easily see the axle damper seats DW10 located near the four corners of the bogie frame DW from the outside and easily engage the positioning pins 311 with the positioning holes DW11. Furthermore, the four positioning pins 311 engaged with the positioning holes DW11 are disposed at diagonal positions on the bogie frame DW, allowing the bogie frame DW to be supported in a balanced manner. This allows the wheelset RJ and the bogie frame DW to be assembled or disassembled more stably and smoothly. Furthermore, the positioning holes DW11 drilled in the axle damper seat DW10 are generally formed with high precision by machining, so that the bogie frame DW can be positioned with high precision by the positioning pins 311, and the wheel sets RJ and the bogie frame DW can be assembled or disassembled with even greater precision and speed.

[0121] Furthermore, after the bogie frame DW and the wheelset RJ are assembled, the positioning pin 311 can be removed from the positioning hole DW11 of the bogie frame DW and stored therein by utilizing the axle damper gap formed between the axle damper seat DW10 of the bogie frame DW and the axle damper seat JB1 of the axle box JB of the wheelset RJ. That is, the lifting unit 2 is lowered from the lowered position K2 to the removal position K3 where the positioning pin 311 can be removed from the positioning hole DW11 and stored within the axle damper gap, and then the positioning pin mounting unit 31 is reversed to easily store the positioning pin 311 in the support units 32, 32B, and 32C. As a result, the storing operation of the positioning pin 311 can be easily performed without using a complicated mechanism. When disassembling the bogie frame DW and the wheel set RJ, the reverse operation to the above can be performed to utilize the gap for the axle damper formed between the axle damper seat DW10 in the bogie frame DW and the axle damper seat JB1 in the axle box JB of the wheel set RJ, and the positioning pin 311 can be engaged with the positioning hole DW11 in the bogie frame DW.

[0122] Furthermore, according to this embodiment, the polyamide resin member 315 is fixed to the back side 31b of the positioning pin mounting portion 31, which is opposite the front side 31a on which the positioning pin 311 is mounted. Therefore, when the lifting unit 2 is lowered to remove the positioning pin 311 from the positioning hole DW11 of the bogie frame DW after assembling the bogie frame DW and the wheel set RJ, even if the lifting unit 2 is lowered too far and the axle box JB of the wheel set RJ comes into contact with the positioning pin mounting portion 31, the polyamide resin member 315, which has a small friction coefficient and high wear resistance, abuts against the axle box JB of the wheel set RJ, thereby promoting vertical rotation of the positioning pin mounting portion 31 and preventing or reducing damage to the positioning mechanisms 3, 3B, 3C and the axle box JB. This further reduces the burden on the worker when removing and storing the positioning pin 311 from the positioning hole DW11 of the bogie frame DW, thereby improving the safe working environment.

[0123] Furthermore, according to this embodiment, the positioning pins 311 are formed so that the pin length α1 of the two positioning pins 311a, 311c arranged at one diagonal position is longer than the pin length α2 of the two positioning pins 311b, 311d arranged at the other diagonal position, so that the four positioning holes DW11 of the bogie frame DW can be engaged with the two positioning pins 311a, 311c with the longer pin length α1 first, and can be engaged with the two positioning pins 311b, 311d with the shorter pin length α2 later. Also, the four positioning holes DW11 of the bogie frame DW can be disengaged with the two positioning pins 311b, 311d with the shorter pin length α2 first, and can be disengaged with the two positioning pins 311a, 311c with the longer pin length α1 later. Therefore, compared to when all the positioning pins 311 having the same pin length α are simultaneously engaged with or disengaged from the positioning holes DW11 of the bogie frame DW, the positioning pins 311 can be engaged with or disengaged more accurately and quickly with fewer people. As a result, the efficiency of the work of assembling or disassembling the bogie frame DW and the wheel sets RJ using the positioning pins 311 can be improved.

[0124] Furthermore, according to this embodiment, the positioning mechanisms 3, 3B, 3C are provided with the reversing handles 33, 33B, 33C for reversing the positioning pin mounting portion 31 upside down relative to the support portions 32, 32B, 32C, at positions spaced apart from the bogie frame DW in which the positioning hole DW11 is engaged with the positioning pin 311. Therefore, after releasing the positioning pin 311 from the positioning hole DW11 of the bogie frame DW, the worker can easily reverse the positioning pin mounting portion 31 upside down relative to the support portions 32 by gripping the reversing handle 33 and rotating the positioning pin mounting portion 31 by 180 degrees in the vertical direction. Therefore, there is no need to directly grip the positioning pin mounting portion 31, and the safety of the worker can be further improved.

[0125] Furthermore, the reversing handles 33, 33B, and 33C are configured so that they can be stored within the support sections 32, 32B, and 32C or in other locations when the positioning pin mounting section 31 is inverted upside down. Therefore, the lifting section 2 can be lowered to the storage position K4 with the positioning pin mounting section 31 inverted upside down and the reversing handles 33, 33B, and 33C together with the positioning pin 311 stored within the support sections 32, 32B, and 32C or in other locations. When the lifting section 2 is in the storage position K4, the upper end surfaces 3J of the positioning mechanisms 3, 3B, and 3C form a flat surface with the work floor FL. Therefore, when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel sets RJ, the reversing handles 33, 33B, and 33C do not get in the way, providing a large, flat work space. This allows for a safe and comfortable work environment to be easily ensured.

[0126] Furthermore, according to this embodiment, the reversing handle 33 includes a fixed handle portion 33a fixed to the side surface of the bogie frame side end portion 312 of the positioning pin mounting portion 31 that protrudes towards the bogie frame side, and a movable handle portion 33b formed so as to be bendable in the horizontal direction relative to the fixed handle portion 33a, so that an operator can easily turn the positioning pin mounting portion 31 upside down relative to the support portion 32 by grasping the movable handle portion 33b of the reversing handle 33 and rotating the positioning pin mounting portion 31 180 degrees in the vertical direction. During this upside-down turning, a load is applied to the movable handle portion 33b in the vertical direction, so that the movable handle portion 33b can be rotated without bending relative to the fixed handle portion 33a.

[0127] Furthermore, since the movable handle 33b is formed so as to be bendable horizontally relative to the fixed handle 33a, after the positioning pin mounting section 31 is turned upside down relative to the support section 32, the movable handle 33b can be bent horizontally and easily stored within the support section 32. In this way, the reversing handle 33 is easy to grasp and to store within the support section 32, so that the lifting section 2 can be quickly lowered to the storage position K4 with the positioning pin mounting section 31 turned upside down and the reversing handle 33 stored within the support section 32 together with the positioning pin 311, making it even easier to ensure a safe and favorable working environment.

[0128] Furthermore, according to this embodiment, the inversion handles 33B and 33C are formed so as to be attached to or detachable from the pivot axes 313B and 313C which are formed so as to be rotatable integrally with the positioning pin mounting portion 31. Therefore, the operator can easily invert the positioning pin mounting portion 31 up and down relative to the support portions 32B and 32C by grasping the inversion handle 33B attached to the pivot axis 313B or the inversion handle 33C attached to the pivot axis 313C and rotating the positioning pin mounting portion 31 180 degrees in the vertical direction.

[0129] The reversing handle 33C detachably formed on the rotation center shaft 313C may be stored in a storage space 324C formed in the support part 32C, or may be stored in another storage location. Also, for example, an engagement groove 313C2 for a hexagonal wrench may be formed in the end part 313C1 of the rotation center shaft 313C, so that a hexagonal wrench can be used as the reversing handle 33C.

[0130] Furthermore, according to this embodiment, the lifting device main body 1 comprises a base 11 to be installed in the pit PT, a drive motor 121 with a brake and an encoder attached to the base 11, and a drive means 123 connected to the drive motor 121 to move the lifting unit 2 up and down, and the drive motor 121 stops the lifting unit 2 above the storage position K4 based on the numerical data of the encoder, so that the work of setting the stop position of the lifting unit 2 can be carried out quickly and safely.

[0131] In other words, the stop position of the lifting unit 2 can be easily set based on the numerical data of the encoder, eliminating the need for unsafe mechanical adjustments. This makes it possible to further improve the safety and simplification of assembly and disassembly work. For example, the raised position K1 where the positioning pin 311 is engaged with or disengaged from the positioning hole DW11 of the bogie frame DW, the lowered position K2 where the bogie frame DW and the wheel set RJ are assembled or disassembled, and the disengagement position K3 where the positioning pin 311 is disengaged from the positioning hole DW11 are all at different heights from the work floor surface FL, but because the stop position of the drive motor 121 can be set based on the numerical data of the encoder, the setting work can be carried out quickly and safely.

[0132] At storage position K4, the lifting unit 2 is stopped so that the upper end surfaces 3J of the positioning mechanisms 3, 3B, and 3C form a flat surface with the work floor surface FL, so there is no need to change the stop position of the drive motor 121. The encoder of the drive motor 121 also needs to eliminate accumulated errors. Therefore, at storage position K4, the drive motor 121 can be controlled by a signal from, for example, limit switch 16 to uniformly stop the lifting unit 2, reset the encoder to zero, and eliminate the accumulated error of the encoder.

[0133] Furthermore, according to this embodiment, the drive means 123 includes a pair of chain drive gears 123a connected to the drive motor 121 via the reducer 122, and a pair of interlocking chains 123b whose one end sides 123c connected to the lifting unit 2 are meshed with each other by the chain drive gears 123a and rigidified, so that when the drive motor 121 rotates forward, the one end sides 123c of the interlocking chains 123b rigidified by the chain drive gears 123a extend, thereby lifting the lifting unit 2. When the drive motor 121 rotates reversely, the one end sides 123c of the interlocking chains 123b rigidified by the chain drive gears 123a shorten, thereby lowering the lifting unit 2.

[0134] Therefore, the lifting stroke of the lifting unit 2 is determined by the length of one end side 123c of the rigidified interlocking chain 123b, and the vertical length of the lifting device main body 1 can be shortened as much as possible. Therefore, the depth of the pit PT in which the lifting device main body 1 is installed can be made shallow, thereby saving on construction costs, etc. Also, the bogie frame lifting devices 10, 10B, 10C with long lifting strokes can be easily installed in an existing pit PT.

[0135] Furthermore, the load when the bogie frame DW is mounted on the positioning mechanisms 3, 3B, 3C acts on the chain drive gear 123a via one end side 123c of the rigidified meshing chain 123b, but since the reducer 122 is interposed between the chain drive gear 123a and the drive motor 121, the load on the drive motor 121 can be significantly reduced by the reducer 122. Therefore, the bogie frame lifting devices 10, 10B, 10C that lift and lower the bogie frame DW, which is a heavy object, can be made more compact, and the working space can be expanded.

[0136] Furthermore, according to this embodiment, the lifting device main body 1 includes a rectangular cylindrical fixed guide unit 13 formed below the work floor surface FL, and the lifting unit 2 includes a rectangular cylindrical movable guide unit 21 formed so as to be insertable into the fixed guide unit 13. The positioning mechanisms 3, 3B, and 3C are attached to the upper end 21J of the movable guide unit 21, and the axis 21JS of the movable guide unit 21 is disposed at a position eccentric to the bogie frame side relative to the axis 13JS of the fixed guide unit 13. This allows the movable guide unit 21 to be brought closer to the bogie frame side, thereby reducing the amount of protrusion of the positioning pin mounting unit 31, to which the positioning pin 311 is attached, toward the bogie frame side relative to the movable guide unit 21. Furthermore, by reducing the amount of protrusion of the positioning pin mounting unit 31 toward the bogie frame side, the amount of protrusion of the positioning pin mounting unit 31 toward the opposite side of the bogie frame when the positioning pin mounting unit 31 is turned upside down can be reduced accordingly. This allows the planar size of the positioning mechanisms 3, 3B, and 3C to be made more compact. As a result, at the storage position K4 of the lifting section 2, the upper end surfaces 3J of the compact positioning mechanisms 3, 3B, 3C form a flat surface between them and the work floor surface FL, so that when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, the positioning mechanisms 3, 3B, 3C are even less likely to get in the way, ensuring a safe, flat, and wide work space.

[0137] Furthermore, according to this embodiment, the lifting unit 2 is provided with a second movable guide portion 22 formed so as to be insertable between the fixed guide portion 13 and the movable guide portion 21, and an inner wall surface 223 of the second movable guide portion 22 is provided with a second protrusion 224 formed so as to be able to come into contact in the up-down direction with a protrusion 214 protruding from the outer wall surface 213 of the movable guide portion 21. In the storage position K4 of the lifting unit 2, the upper end portion 22J of the second movable guide portion 22 is at the same height as the work floor surface FL, and the second movable guide portion 22 is aligned with the fixed guide portion 13. While maintaining the lifted state, the protrusion 214 and the second protrusion 224 come into contact with each other midway as the movable guide unit 21 ascends, thereby lifting the upper end 22J of the second movable guide unit 22 above the working floor surface FL. This allows the movable guide unit 21 and the second movable guide unit 22 to be raised and lowered telescopically relative to the fixed guide unit 13, thereby increasing the lifting stroke of the lifting unit 2 relative to the lifting device main body 1 and correspondingly reducing the vertical height of the lifting device main body 1. As a result, the depth of the pit PT in which the lifting device main body 1 is installed can be reduced, thereby saving on construction costs, etc. Furthermore, when the lifting unit 2 is stored in position K4, the upper end 22J of the second movable guide unit 22 forms a flat surface with the working floor surface FL. Therefore, the second movable guide unit 22 does not get in the way when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, ensuring a safe, flat, and wide working space.

[0138] Furthermore, according to this embodiment, the fixed rail portion 19 that vertically guides the second slide portion 227 that is fixed to the outer wall surface 22G of the second movable guide portion 22 on the opposite bogie frame side is fixed to the inner wall surface 13N of the fixed guide portion 13, and the movable rail portion 226 that vertically guides the slide portion 216 that is fixed to the outer wall surface 21G of the movable guide portion 21 on the opposite bogie frame side is fixed to the inner wall surface 22N of the second movable guide portion 22, so it is possible to further increase the lifting and lowering stroke of the movable guide portion 21 relative to the fixed guide portion 13, while further increasing the eccentricity amount β that is the eccentricity of the axis 21JS of the movable guide portion 21 toward the bogie frame side with respect to the axis 13JS of the fixed guide portion 13. Therefore, it is possible to further increase the lifting position K1 at which the bogie frame DW is received or delivered, and it is possible to reduce the eccentric load on the movable guide portion 21, thereby enabling the bogie frame DW to be lifted and lowered stably.

[0139] Furthermore, since the amount of protrusion of the positioning pin mounting portion 31 toward the bogie frame side can be reduced, when the positioning pin mounting portion 31 is turned upside down, the amount of protrusion of the positioning pin mounting portion 31 toward the side opposite the bogie can be reduced, and the planar size of the positioning mechanisms 3, 3B, 3C can be made even more compact. As a result, at the storage position K4 of the lifting unit 2, the positioning mechanisms 3, 3B, 3C do not get in the way even more when performing various tasks before and after assembling or disassembling the bogie frame DW and the wheel set RJ, ensuring a safe, flat, and wide working space. [Industrial Applicability]

[0140] The present invention can be used as a bogie frame lifting device for lifting and lowering a bogie frame in a railway vehicle. [Explanation of symbols]

[0141] 1. Lifting device main body 2 Lifting section 2J Upper end 3, 3B, 3C positioning mechanism 3J Upper end surface (flat surface) 10, 10B, 10C Bogie frame lifting device 11 Foundation 13 Fixed guide part 13JS shaft core 13N inner wall 19 Fixed rail section 21 Movable guide part 21G External wall surface 21J Upper end 21JS shaft core 22 Second movable guide part 22G Exterior wall 22J Upper end 22N inner wall 31 Positioning pin mounting part 31a Front side 31b Back side 32, 32B, 32C support part 33, 33B, 33C Reversible Handle 33a Fixed handle part 33b Movable handle part 50 Carriage Assembly Stage 121 Drive motor 122 Reducer 123 Driving means 123a Chain drive gear 123b Interlocking Chain 123c One end side 214 Convex 216 Slide section 224 Second convex part 226 Movable rail section 227 Second slide part 311 Locating pin 312 Bogie frame side end 313, 313B, 313C Rotation center axis 315 Polyamide resin materials DW bogie frame DW10 Shaft damper seat DW11 positioning hole FL Working floor surface JB axle box K1 ascending position K2 lowering position K3 Detachment position K4 Storage position PT Pit RJ wheel set TS Railway Vehicles α, α1, α2 pin length

Claims

1. A bogie frame lifting device including a positioning pin formed to be engageable from below with a positioning hole of a bogie frame of a railway vehicle, the bogie frame engaged with the positioning pin being lifted and lowered between a raised position above a work floor surface and a lowered position, a lifting device main body installed in a pit formed below the work floor surface; and a lifting section formed to be guided by the lifting device main body and capable of moving up and down between the raised position and a storage position below the lowered position, a positioning mechanism including a positioning pin mounting portion at an upper end of the lifting portion, the positioning pin being mounted facing upward at a position protruding toward the bogie frame, and a support portion that supports the positioning pin so that the positioning pin can be stored by rotating the positioning pin mounting portion 180 degrees in the vertical direction and inverting it upside down, a bogie frame lifting device, characterized in that an upper end surface of the positioning mechanism forms a flat surface with respect to the work floor surface when the lifting section is lowered to the storage position with the positioning pin stored.

2. The bogie frame lifting device according to claim 1, axle damper seats disposed in the vicinity of the four corners of the bogie frame opposite the axle boxes of the wheel sets, wherein the positioning pins are arranged so as to be engageable with the positioning holes formed in the axle damper seats.

3. The bogie frame lifting device according to claim 2, The bogie frame lifting device is characterized in that a polyamide resin member is fixed to a back surface side of the positioning pin mounting portion opposite to a front surface side on which the positioning pin is mounted.

4. The bogie frame lifting device according to claim 2 or 3, the positioning pins are formed such that the pin length of the two positioning pins arranged at one diagonal position is longer than the pin length of the two positioning pins arranged at the other diagonal position.

5. The bogie frame lifting device according to any one of claims 1 to 4, the positioning mechanism includes an inversion handle for inverting the positioning pin mounting portion upside down relative to the support portion, the inversion handle being located at a position spaced apart from the bogie frame in which the positioning hole is engaged with the positioning pin, The bogie frame lifting device is characterized in that the inversion handle is formed so that it can be stored within the support part or in another location when the positioning pin mounting part is inverted upside down.

6. The bogie frame lifting device according to claim 5, the reversing handle comprises a fixed handle portion fixed to a side surface of the bogie frame side end portion protruding toward the bogie frame side of the positioning pin mounting portion, and a movable handle portion formed so as to be bendable in the horizontal direction relative to the fixed handle portion.

7. The bogie frame lifting device according to claim 5, The bogie frame lifting device is characterized in that the reversing handle is attached to or detachably formed on a rotation center shaft that is rotatably formed integrally with the positioning pin mounting portion.

8. The bogie frame lifting and lowering device according to any one of claims 1 to 7, The lifting device main body includes a base to be installed in the pit, a brake-equipped drive motor having an encoder attached to the base, and a drive means connected to the drive motor to move the lifting unit up and down; The bogie frame lifting device, wherein the drive motor stops the lifting section above the storage position based on the numerical data of the encoder.

9. The bogie frame lifting device according to claim 8, the drive means includes a pair of chain drive gears connected to the drive motor via a reducer, and a pair of interlocking chains whose one ends connected to the lifting section are engaged with each other by the chain drive gears to be rigidified.

10. The bogie frame lifting and lowering device according to any one of claims 1 to 9, The lifting device main body includes a rectangular cylindrical fixed guide portion formed below the work floor surface, and the lifting unit includes a rectangular cylindrical movable guide portion formed so as to be insertable into the fixed guide portion, the positioning mechanism is attached to an upper end of the movable guide portion, a bogie frame lifting device, characterized in that the axis of the movable guide portion is disposed at a position eccentric to the axis of the fixed guide portion toward the bogie frame side;

11. The bogie frame lifting and lowering device according to claim 10, the lifting section includes a second movable guide section having a rectangular cylindrical shape and formed so as to be insertable between the fixed guide section and the movable guide section, an inner wall surface of the second movable guide portion is provided with a second protrusion formed so as to be able to come into contact with a protrusion protruding from an outer wall surface of the movable guide portion in the up-down direction; When the lifting unit is in the stored position, the upper end of the second movable guide unit is at the same height as the work floor surface, a bogie frame lifting device characterized in that, while maintaining a state in which the second movable guide portion is overlapped with the fixed guide portion, the upper end of the second movable guide portion is raised above the work floor surface by the convex portion abutting against the second convex portion from midway through the upward movement of the movable guide portion.

12. The bogie frame lifting and lowering device according to claim 11, a fixed rail portion is fixed to an inner wall surface of the fixed guide portion on the side opposite the bogie frame, the fixed rail portion vertically guiding a second slide portion fixed to an outer wall surface of the second movable guide portion on the side opposite the bogie frame, a movable rail portion that guides a slide portion fixed to an outer wall surface of the movable guide portion on the side opposite the bogie frame in a vertical direction, the slide portion being fixed to an inner wall surface of the second movable guide portion on the side opposite the bogie frame.

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