JP2014009077A - Telescopic boom with trolley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopic boom with a trolley, making a fleet angle from a drum of a hoist winch device constant regardless of traveling of a trolley device and also making the height of a hook constant.SOLUTION: This telescopic boom 5 with a trolley includes: a hoist winch device provided on a column post 4; and a return sheave 28 for folding a wire rope, which is provided at the forward end of a tip boom. The wire rope W drawn from a drum 22d of the hoist winch device 22 is wrapped round a sheave 30 of a trolley device 20 through the return sheave 28, and the wire rope terminal 32 is fixed to the base end part 5k of the telescopic boom 5.

Description

  The present invention relates to a telescopic boom with a trolley having a telescopic boom and a trolley device that is movable along a boom longitudinal direction at a lower end of a distal end boom of the telescopic boom.

  This type of telescopic boom with a trolley is a telescopic boom that is provided at the upper part of a column post and is composed of a plurality of booms, and a trolley device that is movable in the longitudinal direction of the boom at the lower part of the tip boom of the telescopic boom Are known. The trolley device is provided near the crane turning center axis so as to be movable along the boom longitudinal direction at the lower part of the tip boom constituting the telescopic boom in order to ensure so-called workability (see, for example, Patent Document 1). ).

  For example, in the telescopic boom with a trolley described in Patent Document 1, a trolley boom is attached so as to surround the outer side of the distal end boom whose section is narrower than the base end boom, and the trolley device is suspended from the trolley boom. The hoist winch device is provided in the column, and the wire rope fed from the drum of the hoist winch device is directly wound around the sheave of the trolley device.

Japanese Patent No. 2624421 (FIG. 5)

  However, in the telescopic boom with a trolley described in Patent Document 1, the wire rope fed from the hoist winch device is directly wound around the sheave of the trolley device, so that the wire rope length between the hoist winch device and the trolley device is It will vary depending on the travel position of the device. That is, as shown in the schematic diagram of the wire rope hanging state in FIG. 8, when the sheave 30 of the trolley device moves along the boom longitudinal direction by running of the trolley device (not shown), the fleet angle (as shown in FIG. 8). Signs θ1, θ2) suddenly increase or decrease. In the present embodiment, the “fleet angle” is an angle (θ1, θ2) between the wire rope W fed from the drum 22d and the sheave with respect to the center line CL of the drum 22d of the hoist winch device 22.

  A sudden increase / decrease of the fleet angles θ1, θ2 causes a turbulent winding in the hoist winch device. Further, as the distance between the hoist winch device and the trolley device changes, the length of the wire rope fed out from the drum also changes, so the height of the hook changes. Therefore, in order to make the hook height constant, it is necessary to separately control the amount of wire rope drawn out.

  Therefore, the present invention has been made paying attention to such a problem, and has a telescopic boom with a telescopic boom and a trolley device that is movable along the longitudinal direction of the boom at the lower end of the telescopic boom. To provide a telescopic boom with a trolley that can make the fleet angle from the drum of the hoist winch device constant and can keep the height of the hook constant regardless of the traveling of the trolley device. It is aimed.

  In order to solve the above-described problem, the telescopic boom with a trolley according to one aspect of the present invention is provided at the upper portion of the column post, and is configured by a plurality of booms, and the base end side boom becomes narrower and becomes a front end boom. A telescopic boom with a trolley having a telescopic boom with a telescopic boom that is the outermost frame when contracted, and a trolley device that is movable along the longitudinal direction of the boom at a lower portion of the front boom. A wire rope drawn out from the drum of the hoist winch device, having a hoist winch device provided on the column post so as to be able to wind a rope, and a return sheave for returning a wire rope provided at the tip of the tip boom, It is routed around the sheave of the trolley device after passing through the return sheave. Wherein the Yaropu terminal is fixed to the proximal end of the telescopic boom.

  According to the telescopic boom with a trolley according to one aspect of the present invention, the wire rope drawn from the drum of the hoist winch device is hung around the sheave of the trolley device through the return sheave provided at the tip of the tip boom. Because the wire rope end is fixed to the base end of the telescopic boom, the wire rope for the distance between the hoist winch device and the boom tip is always kept constant regardless of the travel of the trolley device. Does not change. Therefore, the fleet angle can be made constant. In addition, with such a configuration, the length of the wire rope between the hoist winch device and the wire rope terminal at the base end of the telescopic boom does not change even when the trolley device travels. The height can be made constant. Thereby, a rapid increase in the fleet angle does not occur, and the occurrence of turbulence is prevented or suppressed. And since the hook height during driving | running | working of a trolley apparatus can be made constant, favorable workability | operativity in a cargo bed and the ease of operation are attained.

  Here, in the telescopic boom with a trolley according to one aspect of the present invention, the column post has a position where the fleet angle of the wire rope becomes a necessary minimum angle in the vicinity of the flange end portion of the drum of the hoist winch device. In order to ensure, if the roller which can adjust the position of the said wire rope in the transversal direction of the said telescopic boom is provided, it is suitable when ensuring the fleet angle for a required minimum angle.

Further, in the telescopic boom with a trolley according to one aspect of the present invention, the hydraulic boom that drives the telescopic boom and the trolley device moves the telescopic cylinder that telescopically extends the telescopic boom, and the trolley device moves along the boom longitudinal direction. A trolley motor to be operated is provided in parallel to the two electromagnetic switching valves, and each electromagnetic switching valve performs switching of the oil path by a switching device provided at the distal end portion and the proximal end portion of the telescopic boom, respectively. The switching device at the tip of the boom switches the oil path of the corresponding electromagnetic switching valve by contact with the trolley device, and the switching device at the base of the boom is connected to the telescopic boom when the telescopic boom is contracted. The oil path of the corresponding electromagnetic switching valve is switched by contact, and when the switching device at the end of the boom is not activated, the two electromagnetic switching valves are moved forward. No oil passages to drive only trolley motor, when switcher device of the boom base end has not been operated, it is preferable that the two electromagnetic switching valve forms an oil passage so as to drive only the tele cylinder.
With such a configuration, the trolley device can be moved over the entire length of the boom in the longitudinal direction by one operation. For example, by operating only one operation lever, the trolley device extends from the so-called flank position near the crane turning center axis. The suspended load can be transported to the tip of the boom at the time.

  As described above, according to the present invention, the fleet angle from the drum of the hoist winch device can be made constant and the height of the hook can be made constant regardless of the traveling of the trolley device.

It is a left side view of one embodiment of a crane for mounting on a railroad vehicle provided with a telescopic boom with a trolley according to one aspect of the present invention. It is a figure explaining the principal part of this invention, The figure (b) is an enlarged view of the principal part of FIG. 1, (a) shows only the structure of the wire rope in the planar view of the figure (b). FIG. It is a block diagram explaining one Embodiment of the hydraulic circuit of the crane for track-and-vehicle vehicles concerning one mode of the present invention. It is a left side view (figure which shows a run state on a road) of one embodiment in the state where a crane for mounted on a railroad vehicle concerning one mode of the present invention was mounted in a railroad vehicle. It is a figure which shows the state which mounted the track-and-rail vehicle of FIG. 4 on the track of a railroad. 6 is a diagram illustrating a state in which the trolley device is moved from the base end side of the telescopic boom to the tip end side along the boom longitudinal direction in the track-and-rail vehicle of FIG. It is a figure which shows the state which extended | stretched the telescopic boom further from the state shown in FIG. It is a schematic diagram which shows the structural example of the conventional wire rope hung.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. In addition, this embodiment is an example which applied the telescopic boom with a trolley which concerns on this invention to the crane for track-rail vehicles mounting. A railroad vehicle is a special vehicle that can travel on a railroad track by adding an iron wheel and a turntable under the vehicle body to a vehicle that can travel on the road.
As shown in FIG. 1, in this railcar mounted crane 1, a base 3 having an outrigger 2 is mounted and fixed on a crane mounting base 6. The support bracket 7 that supports the crane mounting base 6 is fixed on a chassis frame 13 between the cab 11 and the loading platform 12 of the rail vehicle 10 shown in FIG.

  As shown in FIG. 1, a swivel base 19 is provided on the base 3, and an extendable column post 4 is erected on the swivel base 19 so as to be turnable. A telescopic boom 5 is fixed to the upper end of the column post 4 in a horizontal posture. The telescopic boom 5 is provided with a trolley device 20 that hangs down a hook 21 so as to be movable along the longitudinal direction of the telescopic boom 5.

  This railcar mounted crane 1 is configured to adjust the height of the telescopic boom 5 by the expansion and contraction of the column post 4. The column post 4 has a plurality of cylindrical casings nested in the vertical direction. In this example, the upper casing 41 is composed of two upper and lower casings 41 and 42, the lower end of the lower casing 42 is fixed to the swivel base 19 on the base 3, and the upper casing 41 is positioned so as to cover the outer side of the lower casing 42. The housing 42 is slidably fitted along the axial direction of the lower housing 42 from the upper end side. The upper and lower housings 41 and 42 are connected to each other by an extension cylinder (column cylinder) 43 provided on the back surface of the column post 4 (the surface opposite to the extension boom 5 side). Accordingly, the upper housing 41 slides up and down along the lower housing 42. As shown in FIG. 5, the upper surface height H of the telescopic boom 5 when the column post 4 is fully extended is the restricted height of the overhead line L (for example, in a state where the railroad vehicle is placed on the railroad track R). 4 m).

  This railcar mounted crane 1 has a configuration in which the telescopic boom 5 does not rise and fall, and as shown in FIG. 1 and FIG. In addition, on the side surface of the telescopic boom 5, an electromagnetic switching valve (described later) that switches between the hydraulic hose group and the telescopic boom 5 and the trolley device 20 is mounted.

  The telescopic boom 5 is composed of a plurality of booms (three stages in this example). In this embodiment, the base end side boom 51 attached horizontally to the upper part of the column post 4 and the base end boom 51 are installed so that the base end boom 51 extends along the axial direction thereof. An intermediate boom 52 that is slidably movable, and a distal end boom 53 that is installed so as to insert the intermediate boom 52 and is slidably movable along the axial direction of the intermediate boom 52. It has. These booms 51, 52, and 53 are formed in a three-stage nesting shape that becomes a thicker boom at the tip. That is, among the booms, the proximal boom 51 is thin, the intermediate boom 52 is thicker than the proximal boom 51, and the distal boom 53 is thicker than the intermediate boom 52. The booms 51, 52, and 53 can only be expanded and contracted in the horizontal direction by the telecylinder 54, and the distal end boom 53 is the outermost frame when contracted.

  As shown in FIG. 1, the trolley device 20 has a traveling rail 24 directly attached along the lower surface of the tip boom 53, and a drive hydraulic motor (not shown) is installed inside the boom tip. A drive sprocket 25 connected to the drive shaft of the hydraulic motor is provided on the distal end side of the side surface of the tip boom, and a drive chain 27 is bridged between the driven sprocket 26 and the drive sprocket 25 provided on the proximal end side. Yes. The main body of the trolley device 20 is connected to the middle portion of the drive chain 27, and when the hydraulic motor is driven, the trolley device 20 is pulled by the drive chain 27 and along the traveling rail 24 on the lower surface of the tip boom 53. The trolley device 20 travels in the boom longitudinal direction. As a result, it is possible to suspend and move the load on the hook 21 to the front of the loading platform.

  Here, as shown in FIG. 2, the trolley device 20 includes only a sheave 30 for hanging the wire rope W around the hook 21, and does not have a winch device. The telescopic boom 5 has a return sheave 28 for turning the wire rope at the tip of the tip boom 53. The hoist winch device 22 has a drum 22 d around which a wire rope is wound, and is provided on the upper portion of the upper housing 41 that is the movable side of the column post 4 that expands and contracts with respect to the column post 4. The wire rope W drawn from the drum 22d of the hoist winch device 22 is routed around the sheave 30 of the trolley device 20 through the return sheave 28, and the terminal 34 of the wire rope W is connected to the base of the telescopic boom 5. It is fixed to the end 5k. Further, the column post 4 has a short side direction of the telescopic boom 5 (paper surface in FIG. 2B) in order to secure the necessary minimum angle of the fleet angle in the vicinity of the flange end portion of the drum 22d of the hoist winch device 22. A roller 36 capable of adjusting the position of the wire rope W in the (perpendicular direction) is provided.

  In the vehicle-mounted crane 1, as shown in FIG. 1, the operation lever 31 is provided on the side surface of the base 3 (the surface opposite to the telescopic boom 5 side), and the pressure oil required for the operation lever 31 and the actuator. A control rod 33 for supplying and discharging the gas is connected by a connecting rod 32. The telescopic operation of the telescopic boom 5 and the movement operation of the trolley device 20 are enabled to move over the entire length of the trolley device 20 in the boom longitudinal direction by operating one boom telescopic lever 31.

Specifically, as shown in the block diagram of the hydraulic circuit in FIG. 3, the trolley motor 64 for moving operation of the trolley device 20 and the telecylinder 54 for extending and retracting the telescopic boom 5 use one control valve 60. The oil passages are connected in parallel via two electromagnetic switching valves 61 and 62. The hydraulic pump 70 that receives power from the PTO supplies pressure oil to the control valve 60, and pressure oil necessary for driving is distributed from the control valve 60 to each actuator. In this example, the required pressure oil is supplied from the control valve 60 to each actuator (54, 63, 64, 66 to 69) of the crane 1 body.
Two electromagnetic switching valves 61 and 62 are used to switch the pressure oil to the two actuators 54 and 64 for the trolley device 20 and the telescopic boom 5. The switching of the oil paths of the two electromagnetic switching valves 61 and 62 is performed based on input signals from limit switches 81 and 82 as switching devices (see FIG. 1).

  That is, the limit switch 81 for energizing the electromagnetic switching valve 61 is provided so as to directly contact the trolley device 20 at a stop position where the trolley device 20 has moved to the tip of the boom of the telescopic boom 5. In addition, the limit switch 82 that energizes the electromagnetic switching valve 62 is the telescopic boom 5 (the base end portion of the intermediate boom 52) when the telescopic boom 5 is contracted to the boom contraction storage position of the boom base end portion of the telescopic boom 5. It is provided so that it may contact | abut directly. Here, for convenience, when the limit switch 81 is operated, the electromagnetic switching valve 61 is normally open, and when the limit switch 82 is operated, the electromagnetic switching valve 62 is normally closed. Therefore, when the telescopic boom 5 is completely retracted and the trolley device 20 is not moved to the boom tip, for example, in a state before starting the crane work, the limit switch 81 at the boom tip is not operated, so the electromagnetic switching valve. Reference numeral 61 indicates that the energization is cut off. Since the limit switch 82 at the boom base end portion is in operation, the electromagnetic switching valve 62 is also cut off. When the electromagnetic switching valve 61 is energized, an oil passage is formed with the telecylinder 54, and when the electromagnetic switching valve 61 is not energized, an oil passage is formed with the trolley motor 64. When the electromagnetic switching valve 62 is also energized, an oil passage is formed with the telecylinder 54, and an oil passage is formed with the trolley motor 64 in a non-energized state. While the trolley device 20 is in operation, both the electromagnetic switching valves 61 and 62 are in a non-energized state. Conversely, when the boom is extended, both the electromagnetic switching valves 61 and 62 are also energized.

When the boom extending / contracting operation lever 31 is operated to the extension side, the pressure oil discharged from the control valve 60 flows into the electromagnetic switching valve 61. When the electromagnetic switching valve 61 is not energized (that is, when the trolley device 20 is not moved to the tip of the boom), only the trolley device 20 is always driven. On the other hand, the electromagnetic switching valve 62 during operation of the trolley device 20 is not energized because the telescopic boom 5 is in the contracted retracted state and the limit switch 82 is struck, so that the pressure oil is supplied to the tank via the control valve 60. Form a return oil passage.
The trolley device 20 that has moved to the tip of the boom hits the limit switch 81 at the tip of the boom, and the electromagnetic switching valve 61 starts energization. Thereby, the pressure oil flows to the telecylinder 54 side. When the telescopic cylinder 5 starts to extend due to the extension of the telecylinder 54, the base end portion of the intermediate boom 52 is also detached from the limit switch 82, so that the electromagnetic switching valve 62 is also energized.

  Next, when the telescopic boom 5 is in the extended state and the boom extending / contracting operation lever 31 is operated to the reduction side, the telecylinder 54 starts to reduce. Since the electromagnetic switching valve 62 remains energized, the pressure oil discharged from the control valve 60 at this time flows only into the telecylinder 54 side. At the same time that the telescopic boom 5 is completely reduced, the base end portion of the intermediate boom 52 strikes a limit switch 82 provided at the base end position of the telescopic boom 5. Thereby, when the electromagnetic switching valve 62 is de-energized, the oil passage is switched to the trolley motor 64 side, and the trolley device 20 travels to the boom base end side. In addition, description is abbreviate | omitted about the iron wheel drive circuit by the side of a rail vehicle main body.

Next, the operation and effect of the crane 1 for mounting a rail vehicle and the telescopic boom 5 including the trolley device 20 will be described.
As shown in FIG. 4, the railcar mounted crane 1 stores the outrigger 2 above the bottom surface of the crane and the iron wheels 14 are also accommodated when the vehicle is traveling. On the other hand, as shown in FIG. 5, while working, the iron wheel 14 is extended and placed on the railroad track R, the outrigger 2 is extended downward, the column post 4 is expanded and contracted, and the trolley device 20 is attached to the tip boom 53. Along with the movement, the telescopic boom 5 is expanded and contracted.

The trolley device 20 operates the operation lever 31 for extending and retracting the boom so that the lower part of the tip boom 53 is placed in the longitudinal direction of the telescopic boom 5 in order to ensure workability as shown in FIG. Move along the direction. When the telescopic boom 5 is extended, first, the trolley device 20 travels from the base end position of the telescopic boom 5 toward the distal end (see FIG. 6), and then the trolley device 20 completely moves to the distal end. As shown in FIG. 7, the booms 51, 52, 53 start to extend in the order from the proximal boom 51 to the distal boom 53. On the contrary, at the time of reduction, when the telescopic boom 5 is fully reduced, the trolley device 20 starts traveling to the base end position of the telescopic boom.
According to this railcar mounted crane 1, the telescopic boom 5 is composed of a plurality of booms 51, 52, 53, and the reverse boom assembly is configured such that the thicker boom becomes as the proximal boom 51 becomes thinner and the distal boom 53 becomes thicker. Since the trolley device 20 is provided on the lower surface of the telescopic boom 5, good workability in the loading platform can be ensured.

  Moreover, according to this crane 1 for track-and-rail vehicles mounting, the trolley apparatus 20 is the mass of apparatus itself compared with what mounts a winch apparatus in itself (for example, telescopic boom with a trolley described in Unexamined-Japanese-Patent No. 5-97391). However, the weight is reduced by the amount of the winch device. Therefore, since the mass of the hoist winch device 22 is not added together with the suspended load during work, the overturning moment is advantageous by the mass, and the suspended load can be increased. In particular, since the moment per mass increases in proportion to the increase in the working radius, the higher the effect, the more pronounced the farther work.

  In particular, according to this railcar mounted crane 1, a return sheave 28 for turning the wire rope is provided at the tip of the tip boom 53, and the wire rope W drawn from the drum 22 d of the hoist winch device 22 passes through the return sheave 28. Since it is hung around the sheave 30 of the trolley device 20 and the terminal 34 of the wire rope W is fixed to the base end portion 5k of the telescopic boom 5, a wire rope corresponding to the distance between the hoist winch device 22 and the tip of the boom is used. Since W is always kept constant regardless of the expansion / contraction state of the telescopic boom 5, the length of the wire rope W does not change. Therefore, the fleet angles (θ1, θ2) can be made constant without being affected by the travel of the trolley device 20. Further, with such a configuration, the length of the wire rope between the hoist winch device 22 and the wire rope terminal 34 at the base end of the boom does not change even when the trolley device 20 travels. Therefore, the height of the hook 21 while the trolley device 20 is traveling can be made constant. As a result, a rapid increase in the fleet angle (θ1, θ2) does not occur, and the occurrence of turbulence is prevented or suppressed. Further, since the height of the hook 21 during traveling of the trolley device 20 can be made constant, it is possible to ensure good workability in the loading platform and facilitate the operation.

In addition, the column post 4 is provided with the position of the wire rope W in the short direction of the telescopic boom 5 in order to secure the necessary minimum angle of the fleet angle in the vicinity of the flange end portion of the drum 22d of the hoist winch device 22. Since the adjustable roller 36 is provided, the fleet angles (θ1, θ2) are suitable for securing the necessary minimum angle.
In addition, the telescopic boom with a trolley according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

1 Rail-mounted crane (crane body)
2 Outrigger 3 Base 4 Column post 5 Telescopic boom (telescopic boom with trolley)
6 Crane Mount 7 Support Bracket 10 Railroad Vehicle 13 Chassis Frame 14 Iron Wheel 19 Swivel Table 20 Trolley Device 21 Hook 22 Hoist Winch Device 34 End of Wire Rope 36 Roller 41 Upper Housing 42 Lower Housing 43 Telescopic Cylinder (Column Cylinder) )
51 Base end boom 52 Intermediate boom 53 Front end boom 54 Telecylinder

Claims (3)

A telescoping boom that is provided at the top of the column post and that is composed of a plurality of booms and that becomes thicker as the proximal boom becomes thinner and becomes the distal boom, and that the distal boom is the outermost frame when reduced. A telescopic boom with a trolley having a trolley device movable along a boom longitudinal direction at a lower portion of the tip boom,
A hoist winch device provided at the column post so that a wire rope can be wound, and a return sheave for turning back a wire rope provided at the tip of the tip boom;
The wire rope drawn out from the drum of the hoist winch device is hung around the sheave of the trolley device through the return sheave, and the wire rope terminal is fixed to the base end portion of the telescopic boom. Features a telescopic boom with a trolley.   In the column post, the wire in the short direction of the telescopic boom is provided in the vicinity of the flange end portion of the drum of the hoist winch device in order to secure a position where the fleet angle of the wire rope is a necessary minimum angle. The telescopic boom with a trolley according to claim 1, further comprising a roller capable of adjusting a position of the rope. In the hydraulic circuit for driving the telescopic boom and the trolley device, a tele-cylinder for expanding and contracting the telescopic boom and a trolley motor for moving the trolley device along the longitudinal direction of the boom are parallel to the two electromagnetic switching valves. Provided,
Each electromagnetic switching valve switches an oil path by a switching device provided at each of the distal end and the base end of the telescopic boom, and the switching device at the boom distal end corresponds to the corresponding electromagnetic by contacting with the trolley device. The oil passage of the switching valve is switched, and the switching device of the boom base end portion is adapted to switch the oil passage of the corresponding electromagnetic switching valve by contact with the telescopic boom when the telescopic boom is contracted,
When the boom switching device is not activated, the two electromagnetic switching valves provide an oil passage to drive only the trolley motor. When the boom proximal switching device is not activated, the two electromagnetic switching valves are The telescopic boom with a trolley according to claim 1 or 2, wherein an oil passage is formed to drive only the telecylinder.

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