JP6986953B2 - Braking device for track-running machines - Google Patents

Description

The present invention relates to a braking device for a track-traveling machine.

FIG. 9 shows an example of a container crane as a general track-traveling machine, where 1 is a container crane, 2 is a port where a container crane 1 is deployed, 3 is a quay in a port 2, and 4 is a quay 3. It is a rail laid so as to extend in a direction orthogonal to the paper surface of FIG. 9, and a traveling device 8 having traveling wheels 7 that can roll along the rail 4 on the support legs 6 of the crane body 5 of the container crane 1. Is attached.

If the container crane 1 is blown by a strong wind during cargo handling work, the traveling of the container crane 1 does not stop against the intention of the driver and runs away, which may cause a collision or collapse with an adjacent machine or a nearby structure. ..

Therefore, as a device for preventing the runaway of the track traveling type machine as described above, there is a clamp device as disclosed in, for example, Patent Document 1 in the past. The clamping device includes a pinching mechanism in which a pair of contacts having a pinching portion formed at the tip thereof are connected so that a substantially intermediate portion thereof is rotatable about an axis, and a base end of the contact in the pinching mechanism. A spring mechanism provided in the portion and narrowing between the base ends of the contacts so that the sandwich always rotates the contact in the closing direction in which the rail is sandwiched, and the base end of the pair of contacts. It is provided with a rotary cam for driving the cam receiving portion formed in the above in a direction of pushing open from the inside thereof and releasing the pinching of the rail by the pinching portion.

However, since the clamp device disclosed in Patent Document 1 employs a method of sandwiching the rail from both sides, jagged teeth may be provided on the contact surface on the clamp device side in order to increase the coefficient of friction with the rail surface. Or, if the contact surface is hardened to make it look like a file, there is a possibility that the side surface of the rail will be scratched. In addition, if the accuracy of the side surface of the rail is low and the dimensions from the center line to the side surface in the width direction vary from side to side, or if the rail is corroded, it is pinched by the pinching portion. However, the tightening force may be significantly reduced and a sufficient holding force may not be obtained.

In order to solve such a problem, a braking device equipped with a fluid pressure cylinder such as a hydraulic cylinder capable of pressing and separating the brake pad in a direction orthogonal to the rolling surface of the traveling wheel of the rail has been developed (for example, Patent Document). 2).

Japanese Unexamined Patent Publication No. 6-72690 Japanese Unexamined Patent Publication No. 2015-58805

By the way, in recent years, in an orbital traveling machine such as the container crane 1, there is an increasing demand for a braking device to be provided below the traveling device 8. This is because, in particular, when modifying an existing track-traveling machine, a braking device cannot be provided under the lower frame extending along the rail 4 so as to connect the support legs 6 between the support legs 6 of the crane main body 5. This is to deal with such cases.

However, in the conventional braking device as described in Patent Document 2, the length of the fluid pressure cylinder cannot be shortened, so that it is difficult to provide the braking device in the lower part of the traveling device 8.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a braking device for a track-traveling machine that can increase the degree of freedom of installation by eliminating restrictions on the installation location at the time of remodeling.

In order to achieve the above object, in the braking device of the track traveling machine of the present invention, the intermediate portion is supported by a rocker pin extending in the horizontal direction perpendicular to the traveling direction at the lower part of the support leg traveling on the rail and shaken. A pair of movably arranged upper equalizer beams and a pair of swingably arranged upper equalizer beams whose intermediate portions are supported by rocker pins extending in a horizontal direction perpendicular to the traveling direction at both ends of the traveling direction of the upper equalizer beam. It has at least one stage of an equalizer device consisting of a lower equalizer beam, and is equipped with a traveling device in which traveling wheels that can roll along a rail are arranged at both ends of the lower equalizer beam in the traveling direction in the lowermost equalizer device. In the braking device of a track-traveling machine
Pressing that is arranged so as to extend in the horizontal direction between the lower equalizer beam and the rail in the lowermost equalizer device, and both ends of the horizontal direction orthogonal to the rail project outward from both side surfaces of the lower equalizer beam. A fluid pressure cylinder interposed between both ends in the horizontal direction orthogonal to the rail of the pressing frame and both side surfaces of the lower equalizer beam in the lowermost equalizer device and raising and lowering the pressing frame, and the above. A braking mechanism having a brake pad attached to the lower surface of the pressing frame can be provided.

The braking device of the track traveling machine may be provided with a fluid pressure unit capable of supplying and discharging working fluid to the cap side chamber and the rod side chamber of the fluid pressure cylinder and expanding and contracting the fluid pressure cylinder.

Further, in the braking device of the track traveling type machine, a braking release mechanism for urging the fluid pressure cylinder in a contracting direction and a braking release mechanism are provided.
A fluid pressure unit that can freely supply and discharge the working fluid to the cap side chamber of the fluid pressure cylinder and that extends the fluid pressure cylinder against the urging force of the braking release mechanism when the working fluid is supplied can be provided.

The braking release mechanism can be a tension spring that connects the lower equalizer beam and the pressing frame in the lowermost equalizer device.

Further, the braking release mechanism may be a compression spring built in the rod side chamber of the fluid pressure cylinder.

According to the braking device of the track-traveling machine of the present invention, it is possible to obtain an excellent effect that the restriction of the installation location at the time of remodeling can be eliminated and the degree of freedom of installation can be increased.

It is a front view which shows the 1st Embodiment of the braking device of the track traveling type machine of this invention. It is a schematic block diagram which shows the 1st Embodiment of the braking device of the track traveling type machine of this invention, and is the figure which shows the state which the braking is released. FIG. 2 is a view taken along the line III-III in FIG. It is a schematic block diagram which shows the 1st Embodiment of the braking device of the track traveling type machine of this invention, and is the figure which shows the state which brake is performed. It is a schematic block diagram which shows the 2nd Embodiment of the braking device of the track traveling type machine of this invention, and is the figure which shows the state which the braking is released. It is a schematic block diagram which shows the 2nd Embodiment of the braking device of the track traveling type machine of this invention, and is the figure which shows the state which brake is performed. It is a schematic block diagram which shows the 3rd Embodiment of the braking device of the track traveling type machine of this invention, and is the figure which shows the state which the braking is released. It is a schematic block diagram which shows the 3rd Embodiment of the braking device of the track traveling type machine of this invention, and is the figure which shows the state which brake is performed. It is an overall side view which shows an example of a container crane as an orbital traveling machine.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 4 are the first embodiments of the braking device of the track-traveling machine of the present invention, and in the drawings, the parts with the same reference numerals as those in FIG. 9 represent the same objects.

In the container crane 1 as a track traveling machine shown in FIG. 1, a lower frame 6a extending along a rail 4 so as to connect the support legs 6 is provided between the support legs 6 of the crane main body 5, and the lower frame 6a is provided with a lower frame 6a. A plurality of traveling devices 8 (two in the example of FIG. 1) are provided on the bottom surface side.

The traveling device 8 includes an upper equalizer beam 9a, an intermediate equalizer beam 9b, a lower equalizer beam 9c, and traveling wheels 7.

The upper equalizer beam 9a is swingably arranged on the bottom surface side of the lower frame 6a with an intermediate portion supported by a rocker pin 10a extending in a horizontal direction perpendicular to the traveling direction. The intermediate portion equalizer beam 9b is swingably arranged so that the intermediate portion is supported by rocker pins 10b extending in a horizontal direction perpendicular to the traveling direction at both ends of the upper equalizer beam 9a in the traveling direction. The lower equalizer beam 9c is swingably arranged so that the intermediate portion is supported by rocker pins 10c extending in the horizontal direction perpendicular to the traveling direction at both ends of the intermediate portion equalizer beam 9b in the traveling direction.

The traveling wheels 7 are arranged at both ends of the lower equalizer beam 9c in the traveling direction so as to be rollable along the rail 4.

In the example shown in FIG. 1, an equalizer device 9A composed of an upper equalizer beam 9a and an intermediate equalizer beam 9b, and an equalizer device 9B composed of an intermediate equalizer beam 9b and a lower equalizer beam 9c are formed in two upper and lower stages. Has been done. Incidentally, the upper equalizer beam 9a in the equalizer device 9A in the upper stage becomes the upper equalizer beam, and the intermediate equalizer beam 9b becomes the lower equalizer beam. Further, the intermediate portion equalizer beam 9b in the lower equalizer device 9B is a relatively upper equalizer beam, and the lower equalizer beam 9c is a lower equalizer beam. However, depending on the scale of the container crane 1 as the track traveling machine, the equalizer device 9A is formed in only one stage, and the traveling wheels 7 are arranged on the lower equalizer beam (in this case, the intermediate equalizer beam 9b). You may. Further, the equalizer device may be formed in three or more upper and lower stages, and traveling wheels 7 capable of rolling along the rail 4 may be arranged at both ends of the lower equalizer beam in the traveling direction in the lowermost equalizer device.

In the lower equalizer beam 9c (lower equalizer beam), a plurality of plates (two in the examples of FIGS. 2 and 3) 9 cps are arranged at a required interval in the width direction of the rail 4, and the plate materials 9 cp are spaced apart from each other. It is configured by disposing a plate material 9cq connecting the above.

A braking mechanism 40 is arranged in each of the traveling devices 8. However, it is not always necessary to arrange the braking mechanism 40 in each of the traveling devices 8, and the braking mechanism 40 may be one as long as a sufficient braking force can be obtained.

The braking mechanism 40 is attached to a lower equalizer beam 9c (lower equalizer beam) in which the traveling wheel 7 is arranged, and as shown in FIG. 2, a pressing frame 50, a fluid pressure cylinder 13, and a brake pad 12 have.

The pressing frame 50 of the braking mechanism 40 is arranged between the lower equalizer beam 9c (lower equalizer beam) and the rail 4 so as to project in the horizontal direction orthogonal to the rail 4.

The fluid pressure cylinder 13 of the braking mechanism 40 has the pressing frame 50 between both ends in the horizontal direction orthogonal to the rail 4 of the pressing frame 50 and both side surfaces of the lower equalizer beam 9c (lower equalizer beam). It is equipped to move up and down. A fixed frame 51 is attached to the lower equalizer beam 9c (lower equalizer beam), and a cylinder body 13a of the fluid pressure cylinder 13 is suspended from a support bracket 52 projecting from the fixed frame 51. The tip of the piston rod 13b hanging from the pressing frame 50 is pivotally attached to the upper surface of the pressing frame 50. The fixed frame 51 includes stopper portions 51a facing both end surfaces of the pressing frame 50 in the longitudinal direction of the rail 4, and the stopper portions 51a restrain the movement of the pressing frame 50 in the longitudinal direction of the rail 4. (See FIGS. 2 and 3). As shown in FIG. 3, two fluid pressure cylinders 13 are arranged on one side, but the number of the fluid pressure cylinders 13 can be set to one or three or more as necessary.

The brake pad 12 of the braking mechanism 40 is attached to the lower surface of the pressing frame 50.

A fluid pressure unit 14 is connected to the fluid pressure cylinder 13.

The fluid pressure unit 14 is configured to be able to supply and discharge a working fluid such as oil to the cap side chamber 13c and the rod side chamber 13d of the fluid pressure cylinder 13 and to expand and contract the fluid pressure cylinder 13 as follows. Will be described in detail.

The fluid pressure unit 14 is connected to a pumping line 16 extending from a tank 15 in which a working fluid is stored and a cap side chamber 13c (a chamber on the side where the piston rod 13b does not protrude) of the fluid pressure cylinder 13. The rod side line 18 connected to the rod side chamber 13d of the fluid pressure cylinder 13 (the chamber on the side where the piston rod 13b protrudes) and the return line 19 leading to the tank 15 are provided. A pump 21 driven by the motor 20 and a check valve 22 for blocking the backflow of the working fluid pumped by the pump 21 are provided in the middle of the pressure feeding line 16. The pumping line 16 and the return line 19 and the cap side line 17 and the rod side line 18 are connected via a solenoid valve 23, and from the middle of the pumping line 16 between the check valve 22 and the solenoid valve 23. An accumulator 25 is connected to the branched accumulator line 24.

The solenoid valve 23 has a brake operating position 23A and a brake releasing position 23B. The brake operating position 23A introduces the working fluid pumped by the pump 21 into the cap side chamber 13c of the fluid pressure cylinder 13 by communicating the pressure feeding line 16 and the cap side line 17, and the rod side line. By communicating the 18 and the return line 19, the working fluid in the rod side chamber 13d of the fluid pressure cylinder 13 is discharged to the tank 15. The brake release position 23B is the cap side while introducing the working fluid pumped by the pump 21 into the rod side chamber 13d of the fluid pressure cylinder 13 by communicating the pressure feed line 16 and the rod side line 18. By communicating the line 17 and the return line 19, the working fluid in the cap side chamber 13c of the fluid pressure cylinder 13 is discharged to the tank 15. The solenoid valve 23 is stopped from being energized to the solenoid during an emergency stop (during an urgent intentional power failure) and during a power failure, and is mechanically switched to the brake operating position 23A by a spring force. There is.

A relief line 26 leading to the tank 15 is branched and connected in the middle of the pressure feed line 16 between the pump 21 and the check valve 22, and the pressure of the working fluid in the pressure feed line 16 is connected in the middle of the relief line 26. A relief valve 27 that opens when the pressure exceeds the set pressure and returns the working fluid to the tank 15 is provided.

In the middle of the accumulator line 24, the high pressure switch 28H that operates when the pressure of the working fluid in the accumulator line 24 reaches the high set pressure and the pressure of the working fluid in the accumulator line 24 reach the low set pressure. A low pressure switch 28L that operates at the time and a shut-off valve 28V that is always open (normally open) and closes when the high pressure switch 28H operates are provided. As a result, when the pressure of the working fluid in the accumulator line 24 reaches the set pressure of the accumulator 25, the high pressure switch 28H is activated and the motor 20 of the pump 21 is stopped from a control device (not shown). While the shut-off valve 28V is closed when a command is output, when the pressure drops below the set pressure of the accumulator 25, the low pressure switch 28L is activated to control the motor 20 of the pump 21. A drive command is output from the device and the shut-off valve 28V is opened.

A drain line 29 for draining the working fluid of the accumulator 25 to the tank 15 is connected in the middle of the accumulator line 24, and a manual on-off valve opened and closed by an operator is connected to the drain line 29. 30 is provided.

Next, the operation of the first embodiment will be described.

As shown in FIG. 2, in a state where the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake release position 23B, the hydraulic fluid fed by the pump 21 is fluid due to the communication between the pumping line 16 and the rod side line 18. While being introduced into the rod side chamber 13d of the pressure cylinder 13, the cap side line 17 and the return line 19 communicate with each other, so that the working fluid of the cap side chamber 13c of the fluid pressure cylinder 13 is discharged to the tank 15. As a result, the piston rod 13b moves in the direction of contracting inside the fluid pressure cylinder 13, the pressing frame 50 is pulled upward, and the brake pad 12 integrated with the pressing frame 50 is the traveling wheel rolling surface 4a of the rail 4. The braking is released, and the container crane 1 can travel.

On the other hand, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake operating position 23A from the state shown in FIG. 2, as shown in FIG. 4, the pumping line 16 and the cap side line 17 communicate with each other. While the working fluid pressure-fed by the pump 21 is introduced into the cap side chamber 13c of the fluid pressure cylinder 13, the rod side line 18 and the return line 19 communicate with each other, so that the working fluid in the rod side chamber 13d of the fluid pressure cylinder 13 becomes. It is discharged to the tank 15. As a result, the piston rod 13b of the fluid pressure cylinder 13 moves in the protruding direction to push down the pressing frame 50, and the brake pad 12 integrated with the pressing frame 50 is pressed against the traveling wheel rolling surface 4a of the rail 4. Braking is done.

When the pressure of the working fluid in the accumulator line 24 reaches the high set pressure of the accumulator 25, the high pressure switch 28H is activated to operate the motor 20 of the pump 21 from a control device (not shown). A stop command is output and the shutoff valve 28V closes. On the other hand, when the pressure drops below the low set pressure of the accumulator 25, the low pressure switch 28L is activated, a drive command is output from the control device to the motor 20 of the pump 21, and the shut is shut. The off valve 28V opens. As a result, the accumulator 25 is constantly stored in a pressure between the high set pressure and the low set pressure. Moreover, the solenoid valve 23 is adapted to mechanically switch to the brake operating position 23A by a spring force by stopping the energization of the solenoid during an emergency stop or a power failure. Further, the shut-off valve 28V is always open (normally open) and is open at the time of emergency stop and power failure. Therefore, in the event of an emergency stop or a power failure, the working fluid accumulated in the accumulator 25 is guided from the accumulator line 24 to the cap side chamber 13c of the fluid pressure cylinder 13 via the cap side line 17, and the piston rod 13b protrudes. The brake pad 12 is pressed against the traveling wheel rolling surface 4a of the rail 4. As a result, even if the pump 21 is stopped during an emergency stop or a power failure, the brake can be operated.

As a result, as described in Patent Document 2, under the lower frame 6a (see FIG. 1) connecting the support legs 6 of the crane main body 5 when remodeling an orbital traveling machine such as the existing container crane 1. Even when the conventional braking device cannot be provided, the braking mechanism 40 can be provided at the lower part of the traveling device 8 without shortening the length of the fluid pressure cylinder 13.

In this way, it is possible to eliminate restrictions on the installation location at the time of remodeling and increase the degree of freedom of installation.

5 and 6 are the second embodiment of the braking device of the track-traveling machine of the present invention, and the portions having the same reference numerals as those of FIGS. 1 to 4 in the drawings represent the same objects, and are basic. The configuration is the same as that of the first embodiment shown in FIGS. 1 to 4.

The feature of the second embodiment is that, as shown in FIGS. 5 and 6, the brake release mechanism 60 for urging the fluid pressure cylinder 13 in the contracting direction is provided.

The braking release mechanism 60 is a tension spring 61 that connects the support bracket 52 of the fixed frame 51 attached to the lower equalizer beam 9c (lower equalizer beam) and the pressing frame 50.

Along with this, in the second embodiment, the rod side line 18 (see FIGS. 2 and 4) connected to the rod side chamber 13d of the fluid pressure cylinder 13 in the first embodiment is no longer necessary, and the fluid pressure unit is not required. 14 is capable of supplying and discharging the working fluid only to the cap side chamber 13c of the fluid pressure cylinder 13, and when the working fluid is supplied, the fluid pressure cylinder 13 is extended against the urging force of the braking release mechanism 60. There is.

The rod side chamber 13d of the fluid pressure cylinder 13 is open to the atmosphere by a port (not shown).

Next, the operation of the second embodiment will be described.

As shown in FIG. 5, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake release position 23B, the cap side line 17 and the return line 19 communicate with each other to operate the cap side chamber 13c of the fluid pressure cylinder 13. The fluid is discharged into the tank 15. Here, the urging force of the tension spring 61 of the braking release mechanism 60 causes the piston rod 13b to move in the direction of contracting inside the fluid pressure cylinder 13, and the pressing frame 50 is pulled upward and integrated with the pressing frame 50. The brake pad 12 separates from the traveling wheel rolling surface 4a of the rail 4, the braking is released, and the container crane 1 can travel. The pumping line 16 of the fluid pressure unit 14 is sealed by the solenoid valve 23 switched to the brake release position 23B, and the working fluid pumped by the pump 21 is sent from the relief line 26 via the relief valve 27. It is returned to the tank 15 and circulated.

On the other hand, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake operating position 23A from the state shown in FIG. 5, as shown in FIG. 6, the pumping line 16 and the cap side line 17 communicate with each other. The working fluid pumped by the pump 21 is introduced into the cap side chamber 13c of the fluid pressure cylinder 13. As a result, the piston rod 13b of the fluid pressure cylinder 13 moves in a protruding direction against the urging force of the tension spring 61 of the braking release mechanism 60, the pressing frame 50 is pushed down, and the brake integrated with the pressing frame 50 is applied. The pad 12 is pressed against the traveling wheel rolling surface 4a of the rail 4 to perform braking.

As a result, as described in Patent Document 2, under the lower frame 6a (see FIG. 1) connecting the support legs 6 of the crane main body 5 when remodeling an orbital traveling machine such as the existing container crane 1. Even when the conventional braking device cannot be provided, the braking mechanism 40 may be provided at the lower part of the traveling device 8 without shortening the length of the fluid pressure cylinder 13, as in the first embodiment. It will be possible. Further, in the case of the second embodiment, the fluid pressure unit 14 and the fluid pressure cylinder 13 need only be connected via the cap side line 17, which leads to simplification of piping.

In this way, in the second embodiment as in the first embodiment, restrictions on the installation location at the time of remodeling can be eliminated, and the degree of freedom of installation can be increased.

7 and 8 are the third embodiment of the braking device of the track-traveling machine of the present invention, and the portions having the same reference numerals as those of FIGS. 5 and 6 in the drawings represent the same objects, and are basic. The configuration is the same as that of the second embodiment shown in FIGS. 5 and 6.

As shown in FIGS. 7 and 8, the feature of the third embodiment is that the braking release mechanism 60 for urging the fluid pressure cylinder 13 in the contraction direction is built in the rod side chamber 13d of the fluid pressure cylinder 13. The point is that the compression spring 62 is provided.

Next, the operation of the third embodiment will be described.

As shown in FIG. 7, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake release position 23B, the cap side line 17 and the return line 19 communicate with each other to operate the cap side chamber 13c of the fluid pressure cylinder 13. The fluid is discharged into the tank 15. Here, the urging force of the compression spring 62 of the braking release mechanism 60 causes the piston rod 13b to move in the direction of contracting inside the fluid pressure cylinder 13, and the pressing frame 50 is pulled upward and integrated with the pressing frame 50. The brake pad 12 separates from the traveling wheel rolling surface 4a of the rail 4, the braking is released, and the container crane 1 can travel.

On the other hand, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake operating position 23A from the state shown in FIG. 7, as shown in FIG. 8, the pumping line 16 and the cap side line 17 communicate with each other. The working fluid pumped by the pump 21 is introduced into the cap side chamber 13c of the fluid pressure cylinder 13. As a result, the piston rod 13b of the fluid pressure cylinder 13 moves in a protruding direction against the urging force of the compression spring 62 of the braking release mechanism 60, the pressing frame 50 is pushed down, and the brake integrated with the pressing frame 50 is applied. The pad 12 is pressed against the traveling wheel rolling surface 4a of the rail 4 to perform braking.

As a result, as described in Patent Document 2, under the lower frame 6a (see FIG. 1) connecting the support legs 6 of the crane main body 5 when remodeling an orbital traveling machine such as the existing container crane 1. Even when the conventional braking device cannot be provided, as in the first embodiment and the second embodiment, the braking mechanism is provided in the lower part of the traveling device 8 without shortening the length of the fluid pressure cylinder 13. It is possible to provide 40. Further, in the case of the third embodiment, the fluid pressure unit 14 and the fluid pressure cylinder 13 need only be connected via the cap side line 17, which leads to simplification of piping and the braking release mechanism 60 as a compression spring 62. Since it is provided inside the fluid pressure cylinder 13, it is also effective in reducing the size of the braking device.

In this way, in the third embodiment as well as in the first embodiment and the second embodiment, it is possible to eliminate the restriction of the installation location at the time of remodeling and increase the degree of freedom of installation.

It should be noted that the braking device for the track-traveling machine of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

1 Container crane (track traveling machine)
2 Port 3 Quay 4 Rail 4a Traveling wheel rolling surface 5 Crane body 6 Support leg 6a Lower frame 7 Traveling wheel 8 Traveling device 9A Equalizer device 9B Equalizer device 9a Upper equalizer beam (upper equalizer beam)
9b Middle equalizer beam (lower equalizer beam (upper equalizer beam))
9c Lower equalizer beam (lower equalizer beam)
9cp Plate 9cq Plate 10a Rocker pin 10b Rocker pin 10c Rocker pin 12 Brake pad 13 Fluid pressure cylinder 13a Cylinder body 13b Piston rod 13c Cap side chamber 13d Rod side chamber 14 Fluid pressure unit 15 Tank 16 Pump side line 18 Cap side line 18 Rod side line 19 Return line 20 Motor 21 Pump 22 Check valve 23 Solvent valve 23A Brake operation position 23B Brake release position 24 Accumulator line 25 Accumulator 26 Relief line 27 Relief valve 28H High pressure switch 28L Low pressure switch 28V Shutoff valve 29 Drain line 30 Manual opening / closing Valve 40 Braking mechanism 50 Pressing frame 51 Fixed frame 51a Stopper 52 Support bracket 60 Braking release mechanism 61 Tensile spring 62 Compression spring

Claims (5)

An upper equalizer beam and both ends of the upper equalizer beam in the traveling direction are arranged swingably by supporting the intermediate portion by a rocker pin extending in the horizontal direction perpendicular to the traveling direction at the lower part of the support leg traveling on the rail. The unit has at least one equalizer device consisting of a pair of lower equalizer beams in which the intermediate portion is supported by a rocker pin extending in the horizontal direction perpendicular to the traveling direction and is swingably arranged, and the lowermost equalizer device. In the braking device of a track-traveling machine equipped with a traveling device in which traveling wheels that can roll along a rail are arranged at both ends of the traveling direction of the lower equalizer beam in the above.
Pressing that is arranged so as to extend horizontally between the lower equalizer beam and the rail in the lowermost equalizer device, and both ends of the horizontal direction orthogonal to the rail project outward from both side surfaces of the lower equalizer beam. A fluid pressure cylinder interposed between both ends in the horizontal direction orthogonal to the rail of the pressing frame and both side surfaces of the lower equalizer beam in the lowermost equalizer device and raising and lowering the pressing frame, and the above. A braking device for a track-traveling machine with a braking mechanism having a brake pad attached to the underside of the pressing frame. The braking device for a track-traveling machine according to claim 1, further comprising a fluid pressure unit capable of supplying and discharging a working fluid to the cap side chamber and the rod side chamber of the fluid pressure cylinder and expanding and contracting the fluid pressure cylinder. A braking release mechanism that urges the fluid pressure cylinder in the direction of contraction,
The first aspect of claim 1, further comprising a fluid pressure unit that can freely supply and discharge the working fluid to the cap side chamber of the fluid pressure cylinder and that extends the fluid pressure cylinder against the urging force of the braking release mechanism when the working fluid is supplied. Braking device for track-traveling machines. The braking device for a track-traveling machine according to claim 3, wherein the braking release mechanism is a tension spring that connects the lower equalizer beam and the pressing frame in the lowermost equalizer device. The braking device for a track-traveling machine according to claim 3, wherein the braking release mechanism is a compression spring built in a rod side chamber of the fluid pressure cylinder.

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