TWI846898B - A braking system for track traveling machine - Google Patents

Abstract

The present invention provides a braking mechanism (40) comprising: a pressing frame (50) disposed between a lower balancing beam (9c) (lower balancing beam) of a lower balancing device and a track (4) and extending in a horizontal direction perpendicular to the track (4); and a hydraulic cylinder (13) embedded in the pressing frame (50) and extending in a horizontal direction perpendicular to the track (4). The two end portions thereof and the two side surfaces of the lower balance beam (9c) (lower balance beam) of the lowest balance device promote the lifting and lowering of the pressing frame (50); and the brake pad (12) is mounted on the lower surface of the pressing frame, and the hydraulic cylinder (13) is fixed by an elastic member (60) for absorbing the bending force of the piston rod (13b) acting on the hydraulic cylinder (13).

Description

Braking device for track-mounted machinery

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

FIG1 is a diagram showing an example of a container crane as a general rail-traveled machine, wherein 1 is a container crane, 2 is a port equipped with the container crane 1, 3 is a quay of the port 2, 4 is a rail laid on the quay 3 in a manner extending in a direction perpendicular to the paper surface of FIG1, and a traveling device 8 having traveling wheels 7 that can roll freely along the rail 4 is installed on the supporting feet 6 of the crane body 5 of the container crane 1.

If the container crane 1 is hit by strong wind during cargo handling, it will go against the operator's will and fail to stop moving, which may lead to loss of control and may cause collision or toppling of adjacent machinery or adjacent structures.

Therefore, as a device for preventing the aforementioned track-traveled machine from losing control, there is conventionally a clamping device as disclosed in Patent Document 1. The clamping device comprises: a clamping mechanism, a pair of contacts having clamping parts formed at the front end, and the middle parts of the pair of contacts are connected to be freely rotatable with the shaft as the center; a spring mechanism, which is arranged at the base end of the contactor of the clamping mechanism, and narrows the base end of the contactor to form the aforementioned contactor to rotate in the direction of "the aforementioned clamping part normally clamping the track"; a rotating cam, which drives the cam receiving part from the inner side of "the cam receiving part formed at the base end of the aforementioned pair of contacts" in the direction of pressing and opening, thereby releasing the clamping of the track by the aforementioned clamping part.

However, in the clamping device disclosed in Patent Document 1, since the method of "clamping the rail from both sides" is adopted, when the contact surface on the side of the clamping device has teeth with fine grooves in order to increase the friction coefficient with the rail surface, or the contact surface is hardened to form a file-like shape, the side surface of the rail may be damaged. In addition, when the accuracy of the side surface of the rail is low, and the dimension from the center line of its width direction to the side surface is offset to the left or right, or when the rail is corroded, the clamping generated by the above-mentioned clamping part cannot be performed consistently, resulting in a significant decrease in the locking force (clamping force), and there is a possibility that sufficient holding force cannot be obtained.

In order to solve this problem, a brake device having a hydraulic cylinder such as an oil cylinder has been developed, which can press and release the brake pad in a direction perpendicular to the rolling surface of the running wheel of the track (for example, please refer to patent document 2). [Prior technical document] [Patent document]

[Patent Document 1] Japanese Patent Publication No. 6-72690 [Patent Document 2] Japanese Patent Publication No. 2015-58805

[Problem to be solved]

In recent years, in rail-travel machines such as the container crane 1, there has been an increasing demand for installing a brake device under the travel device 8. This is to cope with the following situations: in particular, when modifying an existing rail-travel machine, it is not possible to install the brake device under the lower frame "between the support legs 6 of the crane body 5, extending along the rail 4 and connecting the support legs 6".

However, in the conventional brake device described in Patent Document 2, it is difficult to install the brake device below the aforementioned traveling device 8 because the length of the hydraulic cylinder cannot be shortened.

The present invention is developed in view of the above-mentioned traditional problems. The present invention provides a braking device for a track-traveled machine that is not restricted by the installation location during modification and can improve the freedom of installation. [Means for solving the problem]

The braking device of the track-walking machine of the present invention is the braking device of the track-walking machine described below: it has at least one layer of balancing device formed by an upper balancing beam and a pair of lower balancing beams, and has a walking device in which "walking wheels that can roll freely along the track are arranged at both ends of the lower balancing beam in the walking direction under the lowest balancing device", the upper balancing beam, the middle part of which is supported by "a rocking pin extending in a horizontal direction at a right angle to the walking direction", and is freely rockedly arranged at "the lower part of the supporting foot that walks on the track", and the pair of lower balancing beams, the middle part of which is supported by "a rocking pin extending in a horizontal direction at a right angle to the walking direction". The upper balance beam is supported and freely swingably arranged at both ends of the upper balance beam in the travel direction, wherein a braking mechanism is provided, which has: a pressing frame, arranged between the lower balance beam of the aforementioned lowest level balance device and the track, and extending in a horizontal direction perpendicular to the track; and a hydraulic cylinder, embedded between "the two ends of the pressing frame in the horizontal direction perpendicular to the track" and "the two side surfaces of the lower balance beam of the aforementioned lowest level balance device", and promoting the lifting of the pressing frame; and a brake pad, installed on the lower surface of the pressing frame, and the aforementioned hydraulic cylinder is fixed by an elastic member "used to absorb the bending force of the piston rod acting on the hydraulic cylinder".

In the brake device of the aforementioned track-traveled machine, the aforementioned elastic member is embedded between "the lower surface of the support bracket extending from the aforementioned lower side balance beam" and "the back side of the cylinder body of the aforementioned hydraulic cylinder fixed to the lower surface of the support bracket by means of a connecting member", and the front end of the piston rod of the aforementioned hydraulic cylinder is preferably locked into the aforementioned pressing frame.

In addition, in the aforementioned brake device of the rail-travel machine, a metal plate may be provided which is embedded between the "above-mentioned elastic member" and the "back side of the cylinder body of the hydraulic cylinder". [Effect of the invention]

According to the brake device of the track-traveled machine of the present invention, it is possible to achieve the excellent effect of being not limited to the installation location during modification and being able to improve the freedom of installation.

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

FIG. 2 to FIG. 5 are embodiments of the brake device for the rail-traveled machine of the present invention. In the drawings, the parts with the same symbols as those in FIG. 1 represent the same components.

In the container crane 1 which is a rail-walking machine as shown in FIG. 2 , a lower frame 6a which "extends along the rail 4 for connecting the support legs 6" is provided between the support legs 6 of the crane body 5, and a plurality of (two in the example of FIG. 2 ) walking devices 8 are provided on the bottom side of the lower frame 6a.

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

The upper balance beam 9a is supported by a swing pin 10a extending in a horizontal direction perpendicular to the traveling direction in the middle portion thereof, and is freely swingably arranged on the bottom surface side of the lower frame 6a. The middle balance beam 9b is supported by a swing pin 10b extending in a horizontal direction perpendicular to the traveling direction in the middle portion thereof, and is freely swingably arranged at both ends of the upper balance beam 9a in the traveling direction. The lower balance beam 9c is supported by a swing pin 10c extending in a horizontal direction perpendicular to the traveling direction in the middle portion thereof, and is freely swingably arranged at both ends of the middle balance beam 9b in the traveling direction.

The aforementioned traveling wheels 7 are arranged at both ends of the aforementioned lower balance beam 9c in the traveling direction so as to roll freely along the track 4.

In the example shown in FIG. 2 , the "balance device 9A formed by the upper balance beam 9a and the middle balance beam 9b" and the "balance device 9B formed by the middle balance beam 9b and the lower balance beam 9c" form two layers. Incidentally, the upper balance beam 9a in the above-mentioned balance device 9A of the upper layer becomes the upper balance beam, and the middle balance beam 9b becomes the lower balance beam. In addition, the middle balance beam 9b in the above-mentioned balance device 9B of the lower layer relatively becomes the upper balance beam, and the lower balance beam 9c becomes the lower balance beam. However, corresponding to the scale of the container crane 1 as the rail-travel machine, the balancing device 9A may be formed in only one layer, and the lower balancing beam (in this case, the middle balancing beam 9b) may be arranged on the traveling wheels 7. In addition, the balancing device may be formed in three or more layers, and the traveling wheels 7 that can roll freely along the rail 4 may be arranged on both ends of the lower balancing beam of the balancing device of the lowest layer in the traveling direction.

The lower balance beam 9c (lower balance beam) is composed of a plurality of (two in the example of FIGS. 3 and 4) plates 9cp arranged at intervals in the width direction of the rail 4, and connecting plates 9cq arranged between the plates 9cp.

The aforementioned traveling device 8 is provided with a braking mechanism 40. However, it is not necessary to provide the braking mechanism 40 for each of the aforementioned traveling devices 8. As long as sufficient braking force can be obtained, it is OK even if there is only one braking mechanism 40.

The braking mechanism 40 is mounted on the lower balance beam 9c (lower balance beam) provided with the traveling wheel 7, and as shown in FIG. 3, includes a pressing frame 50, a hydraulic cylinder 13, and a brake pad 12.

The pressing frame 50 of the brake mechanism 40 is disposed between the lower balance beam 9c (lower balance beam) and the rail 4 so as to extend in a "horizontal direction perpendicular to the rail 4".

The hydraulic cylinder 13 of the aforementioned braking mechanism 40 is embedded between "the two ends of the aforementioned pressing frame 50 in the horizontal direction perpendicular to the rail 4" and "the two side surfaces of the aforementioned lower balance beam 9c (lower side balance beam)", so as to promote the lifting of the aforementioned pressing frame 50.

A fixed frame 51 is installed on the aforementioned lower balance beam 9c (lower side balance beam), and the cylinder body 13a of the aforementioned hydraulic cylinder 13 is fixed to the lower surface of the support bracket 52 extending from the fixed frame 51 by a connecting member 80 such as bolts, via an elastic member 60 (for example, urethane rubber, etc.) and a metal plate 70 (for example, steel plate, etc.).

The front end portion of the piston rod 13b hanging down from the cylinder body 13a is locked into the pressing frame 50 and fixed by the nut 90.

The aforementioned fixed frame 51 has stopper portions 51a facing both end surfaces of the aforementioned pressing frame 50 in the longitudinal direction of the rail 4, and the stopper portions 51a limit the movement of the pressing frame 50 in the longitudinal direction of the rail 4 (please refer to Figures 3 and 4).

Although the aforementioned hydraulic cylinders 13 are provided with two on one side as shown in FIG. 4 , the number thereof can be set to one or more than three as required.

The brake pad 12 of the brake mechanism 40 is mounted on the lower surface of the pressing frame 50 .

The hydraulic cylinder 13 is connected to a hydraulic unit 14 .

The hydraulic unit 14 is formed so that an operating fluid such as oil can be freely supplied and discharged to the cap side chamber 13c and the rod side chamber 13d of the hydraulic cylinder 13, and causes the hydraulic cylinder 13 to expand and contract. The structure thereof will be described in detail below.

The hydraulic unit 14 includes: a pressure delivery pipeline 16 extending from a storage tank 15 where the actuating fluid is stored; a cap side pipeline 17 connected to a cap side chamber 13c (a chamber on a side where the piston rod 13b does not protrude) of the hydraulic cylinder 13; a rod side pipeline 18 connected to a rod side chamber 13d (a chamber on a side where the piston rod 13b protrudes) of the hydraulic cylinder 13; and a return pipeline 19 leading to the storage tank 15. A pump 21 driven by a motor 20 and a check valve 22 are provided in the pressure delivery pipeline 16 to prevent the backflow of the actuating fluid delivered by the pump 21. The aforementioned pressure delivery pipeline 16 and return pipeline 19, the aforementioned cap side pipeline 17 and the rod side pipeline 18 are connected through the solenoid valve 23, and the pressure accumulation pipeline 24 is connected to the accumulator 25, and the pressure accumulation pipeline 24 is branched from the pressure delivery pipeline 16 between the aforementioned check valve 22 and the solenoid valve 23.

The electromagnetic valve 23 has a brake actuation position 23A and a brake release position 23B. The brake actuation position 23A is a position where the actuation fluid pumped by the pump 21 is introduced into the cap side chamber 13c of the hydraulic cylinder 13 by connecting the pressure delivery line 16 with the cap side line 17, and the actuation fluid in the rod side chamber 13d of the hydraulic cylinder 13 is discharged into the storage tank 15 by connecting the rod side line 18 with the return line 19. The brake release position 23B is a position where the "actuating fluid pressed by the pump 21" is introduced into the rod side chamber 13d of the hydraulic cylinder 13 by connecting the pressure delivery line 16 with the rod side line 18, and the "actuating fluid in the cap side chamber 13c of the hydraulic cylinder 13" is discharged to the storage tank 15 by connecting the cap side line 17 with the return line 19. The solenoid valve 23 stops supplying power to the solenoid when it is stopped in an emergency (when the power supply must be cut off urgently) or when there is a power outage, and mechanically switches to the brake actuation position 23A by the spring force.

In the pressure delivery pipeline 16 between the pump 21 and the check valve 22, a release pipeline 26 leading to the storage tank 15 is branched and connected. In the release pipeline 26, a release valve 27 is provided, which opens when the pressure of the actuating fluid in the pressure delivery pipeline 16 becomes higher than the set pressure, so that the actuating fluid flows back to the storage tank 15.

The aforementioned pressure accumulator line 24 is provided with: a high-order pressure switch 28H, which is activated when the pressure of the actuating fluid in the pressure accumulator line 24 reaches the high-order set pressure; a low-order pressure switch 28L, which is activated when the pressure of the actuating fluid in the pressure accumulator line 24 reaches the low-order set pressure; and a shut-off valve 28V, which is normally open and is closed when the aforementioned high-order pressure switch 28H is activated. Thus, when the pressure of the actuating fluid in the pressure accumulator pipeline 24 reaches the set pressure of the pressure accumulator 25, the high-level pressure switch 28H is actuated, and the control device not shown in the figure outputs a stop command to the motor 20 of the pump 21, and closes the shut-off valve 28V. In addition, when the pressure is lower than the set pressure of the pressure accumulator 25, the low-level pressure switch 28L is actuated, and the control device outputs a drive command to the motor 20 of the pump 21, and opens the shut-off valve 28V.

The aforementioned pressure accumulator pipeline 24 is connected to a discharge pipeline 29 for discharging the operating fluid of the aforementioned pressure accumulator 25 to the storage tank 15 during maintenance, etc. The discharge pipeline 29 is provided with a manual switch valve 30 opened and closed by the operator.

Next, the function of the above-mentioned embodiment is explained.

As shown in FIG3 , when the electromagnetic valve 23 of the hydraulic unit 14 has been switched to the brake release position 23B, the "actuating fluid pressed by the pump 21" is introduced into the rod side chamber 13d of the hydraulic cylinder 13 through the pressure delivery line 16 and the rod side line 18, and the "actuating fluid in the cap side chamber 13c of the hydraulic cylinder 13" is discharged into the storage tank 15 through the cap side line 17 and the return line 19. In this way, the piston rod 13b moves in the contraction direction inside the hydraulic cylinder 13, pulling the pressing frame 50 upward, and the brake pad 12 integrated with the pressing frame 50 is separated from the running wheel rolling surface 4a of the track 4, so that the brake is released and the container crane 1 becomes movable.

In contrast, if the solenoid valve 23 of the hydraulic unit 14 is switched to the brake actuation position 23A from the state shown in FIG3 , as shown in FIG5 , the "actuating fluid pressed by the pump 21" is introduced into the cap side chamber 13c of the hydraulic cylinder 13 by connecting the pressure delivery line 16 and the cap side line 17, and the actuating fluid in the rod side chamber 13d of the hydraulic cylinder 13 is discharged toward the storage tank 15 by connecting the rod side line 18 and the return line 19. In this way, the piston rod 13b of the hydraulic cylinder 13 moves in the protruding direction, pressing the pressing frame 50 downward, and the brake pad 12 integrated with the pressing frame 50 is pressed against the running wheel rolling surface 4a of the track 4, thereby performing braking.

When the pressure of the operating fluid in the pressure accumulator line 24 reaches the high-stage set pressure of the accumulator 25, the high-stage pressure switch 28H is actuated, and the control device (not shown in the figure) outputs a stop command to the motor 20 of the pump 21, and closes the shutoff valve 28V. In addition, when the pressure is lower than the low-stage set pressure of the accumulator 25, the low-stage pressure switch 28L is actuated, and the control device outputs a drive command to the motor 20 of the pump 21, and opens the shutoff valve 28V. In this way, the accumulator 25 normally accumulates a pressure between the high-stage set pressure and the low-stage set pressure. Furthermore, the electromagnetic valve 23 stops supplying power to the electromagnetic coil when the vehicle is in an emergency stop or when the power fails, and mechanically switches to the brake actuation position 23A by the spring force. In addition, the shutoff valve 28V is normally open, and is activated (opened) when the vehicle is in an emergency stop or when the power fails. Therefore, when the vehicle is in an emergency stop or when the power fails, the actuation fluid stored in the accumulator 25 is guided from the accumulator line 24 through the cap-side line 17 to the cap-side chamber 13c of the hydraulic cylinder 13, so that the piston rod 13b moves in the protruding direction, and the brake pad 12 is pressed against the running wheel rolling surface 4a of the track 4. As a result, the brakes can be applied even if the pump 21 stops during an emergency stop or power outage.

Here, the hydraulic cylinder 13 is usually formed such that the back side of the cylinder body 13a is pin-connected to a member that serves as a base, and the front end of the piston rod 13b is pin-connected to a drivable member. However, in this pin-connected structure, due to the above-mentioned structure, the problem of "the total length becomes longer and the restrictions on the installation location become larger" cannot be avoided.

In contrast, in the present embodiment, the back side of the cylinder body 13a of the hydraulic cylinder 13 is fixed to the lower surface of the support bracket 52 by a connecting member 80, although the elastic member 60 and the metal plate 70 are interposed therebetween. The front end of the piston rod 13b hanging down from the cylinder body 13a is locked into the pressing frame 50 and fixed by a nut 90, and a pin connection structure is not adopted. Therefore, the overall length is shortened, which is a very advantageous structure.

Thus, when modifying a track-traveled machine such as an existing container crane 1, even if it is not possible to install the conventional brake device described in Patent Document 2 "below the lower frame 6a (see FIG. 2) connected between the support legs 6 of the crane body 5", the brake mechanism 40 can be installed below the aforementioned travel device 8.

In addition, when the pin connection structure is not adopted, when the above-mentioned brake mechanism 40 is actuated, a bending force acts on the piston rod 13b of the hydraulic cylinder 13. However, the bending force acting on the piston rod 13b of the hydraulic cylinder 13 is absorbed by the elastic member 60, so there is no need to worry about adverse effects on the hydraulic cylinder 13, and the life of the hydraulic cylinder 13 can be avoided from being shortened. In addition, by arranging the metal plate 70 between the elastic member 60 and the hydraulic cylinder 13, the load acting on the hydraulic cylinder 13 can be evenly distributed and transmitted to the elastic member 60. Furthermore, the aforementioned bending force is absorbed by the elastic member 60, and the mounting accuracy of the hydraulic cylinder 13 on the support bracket 52 is no longer subject to strict requirements, so mechanical processing of the surface of the support bracket 52 is no longer required, which in turn reduces costs.

This eliminates the restrictions on the installation location during renovation and increases the freedom of installation.

FIG6 is a reference example of the braking device of the rail-traveled machine of the present invention. In the figure, the parts marked with the same symbols as those in FIG2 to FIG5 represent the same components, and the basic structure is the same as the embodiments shown in FIG2 to FIG5.

In the present reference example, a base 65 formed by an elastic member such as chloroprene rubber is arranged on the upper surface side of the support bracket 52, and a connecting member 80 is passed through the base 65 and locked, thereby fixing the aforementioned hydraulic cylinder 13 to the lower surface of the support bracket 52.

Next, the function of the above reference example is explained.

In this reference example, although only the "total length of the base 65 has been increased", when the aforementioned braking mechanism 40 is actuated, the bending force acting on the piston rod 13b of the hydraulic cylinder 13 is absorbed by the elastic member 60 and also by the base 65. Since the movable range of the hydraulic cylinder 13 is widened, the effect of "making problems less likely to occur" can be further enhanced, which is more conducive to avoiding a shortening of the service life of the hydraulic cylinder 13.

As for other functions, they are the same as those in the embodiments shown in FIG. 2 to FIG. 5 , and thus their description is omitted.

Next, in the embodiment shown in Fig. 2 to Fig. 5, the elastic member 60 is embedded between "the lower surface of the support bracket 52 extending from the lower balance beam 9c as the lower balance beam" and "the back surface of the cylinder body 13a of the hydraulic cylinder 13 fixed to the lower surface of the support bracket 52 by the connecting member 80", and the front end of the piston rod 13b of the hydraulic cylinder 13 is locked into the pressing frame 50. If the hydraulic cylinder 13 is configured as described above, the pin connection structure is not adopted, the overall length is shortened, and the brake mechanism 40 can be provided at the lower part of the traveling device 8.

In the embodiment shown in Fig. 2 to Fig. 5, a metal plate 70 is provided which is embedded between the elastic member 60 and the back of the cylinder body 13a of the hydraulic cylinder 13. If the structure is as described above, the load acting on the hydraulic cylinder 13 can be evenly distributed and transmitted to the elastic member 60.

The brake device of the track-traveled machine of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the present invention.

1: Container crane (track-mounted machine) 2: Harbor 3: Quay 4: Track 4a: Rolling surface of traveling wheel 5: Crane body 6: Support foot 6a: Lower frame 7: Traveling wheel 8: Traveling device 9A: Balancing device 9B: Balancing device 9a: Upper balance beam (upper balance beam) 9b: Middle balance beam (lower balance beam (upper balance beam)) 9c: Lower balance beam (lower balance beam) 9cp: Plate 9cq: Plate 10a: Rocker pin 10b: Rocker pin 10c: Rocker pin 12: Brake pad 13: Hydraulic cylinder cylinder) 13a: cylinder body 13b: piston rod 13c: cap side chamber 13d: rod side chamber 14: hydraulic unit 15: storage tank 16: pressure delivery pipeline 17: cap side pipeline 18: rod side pipeline 19: return pipeline 20: motor 21: pump 22: check valve 23: solenoid valve 23A: brake actuation position 23B: brake release position 24: pressure accumulator pipeline 25: accumulator 26: release pipeline 27: relief valve 28H: higher order pressure switch 28L: low order pressure switch order pressure switch) 28V: Shut off valve 29: Drain pipe 30: Manual switch valve 40: Braking mechanism 50: Pressing frame 51: Fixed frame 51a: Stopper 52: Support bracket 60: Elastic member 65: Base 70: Metal plate 80: Connecting member 90: Nut

[Fig. 1] is an overall side view showing an example of a container crane as a rail-travel machine. [Fig. 2] is a front view showing an embodiment of the brake device of the rail-travel machine of the present invention. [Fig. 3] is a schematic structural diagram showing an embodiment of the brake device of the rail-travel machine of the present invention, which is a diagram showing a state where the brake has been released. [Fig. 4] is a view in the direction of arrows IV-IV of Fig. 3. [Fig. 5] is a schematic structural diagram showing an embodiment of the brake device of the rail-travel machine of the present invention, which is a diagram showing a state where the brake is executed. [Fig. 6] is a schematic structural diagram showing a reference example of the brake device of the rail-travel machine of the present invention, which is a diagram showing a state where the brake has been released.

1: Container crane (track-mounted machinery)

3: Quay wall

4: Track

4a: Rolling surface of the traveling wheel

5: Crane body

6: Support feet

6a: Lower frame

7: Traveling wheels

8: Walking device

9A:Balance device

9B:Balance device

9a: Upper balance beam (upper balance beam)

9b: Middle balance beam (lower balance beam (upper balance beam))

9c: Lower balance beam (lower balance beam)

10a: rocker pin

10b: rocker pin

10c: rocker pin

40: Braking mechanism

Claims (3)

A brake device for a track-traveled machine is a brake device for a track-traveled machine as described below: having at least one layer of a balancing device formed by an upper balancing beam and a pair of lower balancing beams, and having a traveling device with traveling wheels that can roll freely along the track at both ends of the lower balancing beams in the traveling direction under the lowest balancing device, wherein the upper balancing beam, in the middle portion of which is supported by a swing pin extending in a horizontal direction at a right angle to the traveling direction, is freely swingably arranged at the lower portion of a supporting foot that travels on the track, and the pair of lower balancing beams, in the middle portion of which is supported by a swing pin extending in a horizontal direction at a right angle to the traveling direction. , and can be freely swung at both ends of the upper balance beam in the walking direction, Its characteristics are: It has a braking mechanism, which has: a pressing frame, between the lower balance beam of the aforementioned lowest level balance device and the track, and is arranged to extend in the horizontal direction perpendicular to the track; and a hydraulic cylinder, which is embedded in the horizontal direction perpendicular to the track of the pressing frame and between the two side surfaces of the lower balance beam of the aforementioned lowest level balance device, and promotes the lifting of the pressing frame; and a brake pad, which is installed on the lower surface of the pressing frame, The aforementioned hydraulic cylinder is fixed by an elastic member used to absorb the bending force of the piston rod acting on the hydraulic cylinder. The brake device of the track-traveled machine as described in claim 1, wherein the elastic member is embedded between: the lower surface of the support bracket extending from the lower balance beam and the back surface of the cylinder body of the hydraulic cylinder fixed to the lower surface of the support bracket by a connecting member, and the front end of the piston rod of the hydraulic cylinder is locked into the pressing frame. The braking device of the rail-traveled machine as described in claim 2 comprises a metal plate which is embedded between the elastic member and the back side of the cylinder body of the hydraulic cylinder.

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