JP2017149490A - Device for braking track travel type machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for braking a track travel type machine that inhibits rapid generation of brake force on the operation of brake force and can relax load on the track travel type machine.SOLUTION: A brake device using a fluid pressure cylinder 13 includes a relaxing accumulator 31 provided in the middle of a cap-side line 17 serving as a supply flow passage for working fluid for a fluid pressure unit 14 that extends the fluid pressure cylinder 13 to press a brake pad 12 to a rail 4, thereby preventing a rapid inflow of the working fluid, absorbing impact pressure and smoothly conducting braking.SELECTED DRAWING: Figure 2

Description

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

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

  If the container crane 1 is hit by a strong wind during a cargo handling operation, it will not stop running against the will of the driver and will run away, possibly leading to a collision or collapse to an adjacent machine or nearby structure. .

  For this reason, as a device for preventing the above-described runaway, there is a conventional clamping device as disclosed in Patent Document 1, for example. The clamping device includes a pinching mechanism in which a pair of contacts each having a pinching portion formed at a distal end portion are coupled so that a substantially middle portion thereof is rotatable about an axis, and a base end of the contact in the pinching mechanism A spring mechanism that is provided in a portion and narrows a gap between the proximal end portions of the contactors so that the sandwiching portion always rotates the contactors in a closing direction that sandwiches the rail, and the proximal end portions of the pair of contactors And a rotating cam for driving the cam receiving portion formed in the direction from the inside in a direction to open and releasing the clamping of the rail by the clamping portion.

  However, since the clamp device disclosed in Patent Document 1 employs a method of sandwiching the rail from both sides, in order to increase the coefficient of friction with the rail surface, jagged teeth are attached to the contact surface on the clamp device side. Alternatively, when the contact surface is hardened and made like a file, the side surface of the rail may be damaged. In addition, when the rail side surface accuracy is low and the dimension from the center line to the side surface in the width direction varies from side to side, or when the rail is corroded, etc. However, there is a possibility that the tightening force is greatly reduced without being uniformly performed and a sufficient holding force cannot be obtained.

  In order to solve such problems, a braking device having a fluid pressure cylinder such as a hydraulic cylinder capable of pressing and releasing a brake pad in a direction perpendicular to the rolling surface of the traveling wheel of the rail has been developed (for example, Patent Documents). 2).

Japanese Patent Laid-Open No. 6-72690 Japanese Patent Laying-Open No. 2015-58805

  However, in the braking device disclosed in Patent Document 2, if braking is performed rapidly in a short time during operation, a great load is applied to the container crane 1 as a track traveling machine, leading to derailment. Had.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a braking device for a track traveling machine that can reduce a load on the track traveling machine by suppressing rapid braking.

The present invention includes a traveling device provided with traveling wheels that are rollable along a rail;
A fluid pressure cylinder capable of pressing and separating the brake pad in a direction perpendicular to the rail with respect to the running wheel rolling surface of the rail;
In a brake device for a track traveling machine, comprising: a fluid pressure unit that expands and contracts the fluid pressure cylinder by supplying and discharging working fluid to and from the fluid pressure cylinder;
A braking apparatus for a track traveling machine, characterized in that a buffering accumulator is provided in the middle of a supply flow path of a working fluid of a fluid pressure unit for extending the fluid pressure cylinder and pressing a brake pad against a rail. It is.

  In the braking device for the orbital running machine, the supply flow path is preferably a cap side line connected from the fluid pressure unit to a cap side chamber of a fluid pressure cylinder.

  According to the braking device for a track traveling machine of the present invention, it is possible to achieve an excellent effect that a sudden braking can be suppressed and a load on the track traveling machine can be reduced.

It is a front view which shows the Example of the braking device of the track running machine of this invention. It is a schematic block diagram which shows the fluid pressure cylinder in the Example of the braking device of the track traveling machine of this invention. It is a whole side view showing an example of a container crane as a track traveling machine.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an embodiment of a braking device for a track traveling machine according to the present invention. In the figure, the same reference numerals as those in FIG. 3 denote the same components.

  As shown in FIG. 1, a lower frame 6 a extending along the rail 4 is provided between the support legs 6 of the crane body 5 of the container crane 1 as a track traveling machine so as to connect the support legs 6. A brake bracket 10 held by a tension rod 9 is suspended from the bottom surface side of the lower frame 6a, and a cylindrical outer case 11 is attached to the lower portion of the brake bracket 10.

  As shown in FIG. 2, a fluid pressure cylinder 13 is provided in the outer case 11, which can press and release the brake pad 12 in a direction perpendicular to the traveling wheel rolling surface 4 a of the rail 4. The fluid pressure cylinder 13 is arranged vertically so that the side from which the piston rod 13c protrudes faces downward, and the brake pad 12 is provided at the lower end of the piston rod 13c.

  A fluid pressure unit 14 such as a hydraulic unit is connected to the fluid pressure cylinder 13. During normal operation, the fluid pressure unit 14 stores and accumulates the fluid pressure cylinder 13 while expanding and contracting the fluid pressure cylinder 13 by supplying and discharging a working fluid such as oil to and from the fluid pressure cylinder 13. The brake pad 12 is guided to the fluid pressure cylinder 13 and pressed against the traveling wheel rolling surface 4 a of the rail 4.

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

  The solenoid valve 23 has a brake operation position 23A and a brake release position 23B. The brake operating position 23A allows the working fluid pumped by the pump 21 to be introduced into the cap side chamber 13a of the fluid pressure cylinder 13 by communicating the pressure feeding line 16 and the cap side line 17 while the rod side line. 18 is a position where the working fluid in the rod side chamber 13b of the fluid pressure cylinder 13 is discharged to the tank 15 by communicating the return line 18 with the return line 19. The brake release position 23B allows the working fluid pumped by the pump 21 to be introduced into the rod side chamber 13b of the fluid pressure cylinder 13 by communicating the pressure feeding line 16 and the rod side line 18, while the cap side This is a position where the working fluid in the cap side chamber 13 a of the fluid pressure cylinder 13 is discharged to the tank 15 by connecting the line 17 and the return line 19. The solenoid valve 23 is designed to be switched to the brake operating position 23A mechanically by a spring force when energization to the solenoid is stopped during a power failure.

  A relief line 26 leading to the tank 15 is branched 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 in the middle of the relief line 26. A relief valve 27 is provided that opens to return the working fluid to the tank 15 when the pressure exceeds the set pressure.

  In the middle of the pressure accumulation line 24, a high pressure switch 28H that operates when the pressure of the working fluid in the pressure accumulation line 24 reaches a high set pressure, and the pressure of the working fluid in the pressure accumulation line 24 reaches a low set pressure. A low pressure switch 28L is provided which is actuated at the time. Thus, when the pressure of the working fluid in the pressure accumulating line 24 reaches the set pressure of the accumulator 25, the high pressure switch 28H is activated to stop the motor 20 of the pump 21 from a control device (not shown). While the command is output, when the pressure drops below the set pressure of the accumulator 25, the low pressure switch 28L is activated and the drive command is output from the control device to the motor 20 of the pump 21. It is like that.

  A drain line 29 for draining the working fluid of the accumulator 25 to the tank 15 at the time of maintenance or the like is connected in the middle of the pressure accumulation line 24. The drain line 29 is a manual on-off valve that is opened and closed by an operator. 30 is provided.

  In the case of this embodiment, a buffering accumulator is provided in the middle of the cap side line 17 as a working fluid supply flow path of the fluid pressure unit 14 for extending the fluid pressure cylinder 13 and pressing the brake pad 12 against the rail 4. The feature is that 31 is provided.

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

  As shown in FIG. 2, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake operation position 23 </ b> A, the pressure feed line 16 and the cap side line 17 communicate with each other so As the rod side line 18 and the return line 19 communicate with each other while being introduced into the cap side chamber 13 a of the fluid pressure cylinder 13, the working fluid in the rod side chamber 13 b of the fluid pressure cylinder 13 is discharged to the tank 15. As a result, the piston rod 13c moves in a direction protruding from the fluid pressure cylinder 13, and the brake pad 12 is pressed against the traveling wheel rolling surface 4a of the rail 4 to perform braking.

  Here, since the buffer accumulator 31 is provided in the middle of the cap side line 17, the working fluid suddenly flows from the cap side line 17 into the cap side chamber 13 a of the fluid pressure cylinder 13 by the buffer accumulator 31. Is prevented and the impact pressure is absorbed. As a result, unlike the braking device disclosed in Patent Document 2, braking is not suddenly performed in a short time during operation, and a great load is not applied to the container crane 1 as a track traveling machine. There is no need to worry about escaping. In addition, since a servo valve or the like is not used, complicated control is not required, the structure is simple, and cost can be reduced.

  On the other hand, when the solenoid valve 23 of the fluid pressure unit 14 is switched to the brake release position 23B from the state shown in FIG. 2, the working fluid pumped by the pump 21 is communicated with the pressure feed line 16 and the rod side line 18. The working fluid in the cap side chamber 13a of the fluid pressure cylinder 13 is discharged to the tank 15 by the cap side line 17 and the return line 19 communicating with each other while being introduced into the rod side chamber 13b of the fluid pressure cylinder 13. As a result, the piston rod 13c moves in the direction of contracting into the fluid pressure cylinder 13, the brake pad 12 is separated from the traveling wheel rolling surface 4a of the rail 4 to release the braking, and the container crane 1 is caused to travel. Is possible.

  In addition, by using the fluid pressure cylinder 13 that can press and release the brake pad 12 in a direction orthogonal to the traveling wheel rolling surface 4a of the rail 4, the traveling wheel rolling surface 4a of the rail 4 is completely horizontal. However, even if it is undulating, the stroke can be made sufficiently long, unlike a conventional brake actuator that uses a disc spring for brake operation. For this reason, it becomes possible to strongly press the brake pad 12 against the traveling wheel rolling surface 4a of the rail 4 even in a concave portion due to undulation, and a uniform braking force can be obtained. Even if the crane body 5 to which the braking device is attached is elastically deformed, the brake pad 12 is strongly pressed against the traveling wheel rolling surface 4a of the rail 4, so that the braking force is not reduced and is stabilized.

  Further, when the pressure of the working fluid in the pressure accumulating line 24 reaches the high set pressure of the accumulator 25, the high pressure switch 28H is actuated to control the motor 20 of the pump 21 from a control device (not shown). A stop command is output. On the other hand, when the pressure falls below the low set pressure of the accumulator 25, the low pressure switch 28L is actuated and a drive command is output from the control device to the motor 20 of the pump 21. As a result, the accumulator 25 is always accumulated at a pressure between the high set pressure and the low set pressure. In addition, the solenoid valve 23 is designed to be switched to the brake operation position 23A mechanically by a spring force by stopping energization to the solenoid in the event of a power failure. Therefore, during a power failure, the working fluid accumulated in the accumulator 25 is guided to the cap side chamber 13a of the fluid pressure cylinder 13 and 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 a power failure, the brake can be operated.

  In this way, it is possible to reduce the load on the container crane 1 as a track traveling machine by suppressing sudden braking.

  In this embodiment, the supply flow path is a cap side line 17 connected from the fluid pressure unit 14 to the cap side chamber 13 a of the fluid pressure cylinder 13. If comprised in this way, the rapid inflow of the working fluid to the cap side chamber 13a which is the chamber on the side where the piston rod 13c of the fluid pressure cylinder 13 does not protrude can be prevented by the buffering accumulator 31, and the impact pressure can be absorbed. This is effective for smooth braking.

  The braking device for a track traveling machine according to 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 (orbital traveling machine)
4 rail 4a traveling wheel rolling surface 7 traveling wheel 8 traveling device 12 brake pad 13 fluid pressure cylinder 13a cap side chamber 13c piston rod 14 fluid pressure unit 17 cap side line (supply flow path)
31 Buffer accumulator

Claims (2)

A traveling device provided with traveling wheels that can roll along the rail;
A fluid pressure cylinder capable of pressing and separating the brake pad in a direction perpendicular to the rail with respect to the running wheel rolling surface of the rail;
In a brake device for a track traveling machine, comprising: a fluid pressure unit that expands and contracts the fluid pressure cylinder by supplying and discharging working fluid to and from the fluid pressure cylinder;
A braking device for a track type machine, wherein a buffering accumulator is provided in the working fluid supply flow path of a fluid pressure unit for extending the fluid pressure cylinder and pressing a brake pad against a rail.   2. The braking device for a track traveling machine according to claim 1, wherein the supply flow path is a cap side line connected from the fluid pressure unit to a cap side chamber of a fluid pressure cylinder.

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