TW202110683A - A braking system for track traveling machine - Google Patents

Abstract

The present invention is provided with a brake mechanism 40 including: a pressing frame 50 which is installed to protrude in the horizontal direction perpendicular to a rail 4 between the rail 4 and a lower-part equalizer beam 9c (lower equalizer beam) in a lowermost-stage equalizer device; a hydraulic cylinder 13 which is interposed between both horizontal end sections, of the pressing frame 50, perpendicular to the rail 4 and both side surfaces of the lower-part equalizer beam 9c (lower equalizer beam) in the lowermost-stage equalizer device, and which raises/lowers the pressing frame 50; and a brake pad 12 attached to a lower surface of the pressing frame, wherein the hydraulic cylinder 13 is fixed by means of an elastic member 60 that absorbs bending force acting on a piston rod 13b of the hydraulic cylinder 13.

Description

Braking device for track-walking machinery

The present invention relates to an invention of a braking device for a rail-mounted machine.

Figure 1 is a drawing showing an example of a container crane as a general rail-mounted machine, where 1 is a container crane, 2 is a harbor equipped with a container crane 1, 3 is the quay wall of the harbor 2, and 4 is the same as Figure 1. It is laid on the rails of the quay wall 3 in the direction perpendicular to the paper surface. The supporting legs 6 of the crane body 5 of the container crane 1 are installed with a traveling device 8 having "travel wheels 7 that can roll freely along the rail 4".

If the aforementioned container crane 1 is hit by strong winds during cargo handling, it will violate the wishes of the operator and will not be able to stop walking, which will lead to loss of control, which may cause collisions or dumps against adjacent machinery or adjacent structures. Doubts.

Therefore, as a device for preventing runaway of the aforementioned rail-mounted machine, a clamp device as disclosed in Patent Document 1 is conventionally provided. The clamp device is provided with a clamping mechanism, a pair of contactors having a clamping portion formed at the front end portion, and a substantially middle portion of the pair of contactors is rotatably connected with a shaft as a center; a spring mechanism is provided in the clamp The base end portion of the contactor of the holding mechanism is narrowed between the base end portions of the contactor to form the contactor to rotate in the direction of "the clamping portion normally clamps the rail"; the rotating cam moves from " The inner side of the cam receiving portion" formed at the base end portions of the pair of contactors faces the direction of pressing open, and the cam receiving portion is driven to release the clamping of the rail by the clamping portion.

However, in the clamp device disclosed in Patent Document 1, since the method of "clamping the rail from both sides" is adopted, the contact surface on the side of the clamp device has fine dents in order to increase the coefficient of friction with the rail surface. If the tooth is hardened or the contact surface is hardened and formed like a file, it may cause damage to the side surface of the rail. In addition, when the accuracy of the side surface of the rail is low, and the dimension from the center line in the width direction to the side surface is shifted to the left and right, or when the rail is corroded, the clamping by the clamping part cannot be consistent. The locking force (clamping force) is greatly reduced, and there is a possibility that sufficient holding force may not be obtained.

In order to eliminate this problem, a brake device equipped with a hydraulic cylinder such as a hydraulic cylinder has been developed to press and separate the brake pads in the direction of the rolling surface of the traveling wheel perpendicular to the rail (for example, please refer to Patent Document 2). [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 6-72690 [Patent Document 2] JP 2015-58805 A

[Problem to be solved by invention]

In recent years, in rail-mounted machinery such as the container crane 1, there has been an increasing demand for a brake device to be provided at the lower portion of the traveling device 8. This is to cope with the following situations: especially when the existing rail-mounted machinery is remodeled, etc., it is impossible to install the brake device between the supporting legs 6 of the crane body 5 and extend along the rail 4 to connect the brake device. The support leg 6" is below the lower frame.

However, in the conventional brake device as described in Patent Document 2, since the length of the hydraulic cylinder cannot be shortened, it is difficult to provide the brake device in the lower part of the aforementioned traveling device 8.

The present invention is an invention developed in view of the above-mentioned traditional problems. The present invention provides a brake device for rail-mounted machinery that is not restricted by the installation place during the transformation and can increase the degree of freedom of installation. [Means to Solve the Problem]

The brake device of the track-traveling machine of the present invention is the brake device of the track-traveling machine as follows: it has at least one layer of balance device formed by an upper balance beam and a pair of lower balance beams, and is equipped with "in the lowermost layer" The two ends of the balance beam on the lower side of the balance beam are equipped with walking wheels that can roll freely along the track. The middle part of the balance beam on the upper side is horizontally aligned at right angles to the direction of travel. The pair of lower balance beams is supported by the "swinging pin extending in the direction" and is swayably arranged on the "lower part of the supporting foot walking on the rail". The middle part of the pair of lower balance beams is formed by "directing at right angles to the walking direction". It is supported by a horizontally extending rocking pin, and is swayably arranged at both ends of the upper balance beam in the traveling direction, There is a brake mechanism, the brake mechanism has: a pressing frame, arranged between the lower balance beam of the lowermost balance device and the rail, so as to extend in a horizontal direction perpendicular to the rail; and a hydraulic cylinder, which is built-in Between "the horizontal ends of the pressing frame perpendicular to the rail" and "the two sides of the balance beam below the lowermost level of the balance device", and urge the pressing frame to rise and fall; and the brake pads are installed in The lower surface of the aforementioned pressing frame, The aforementioned hydraulic cylinder is fixed by an elastic member "used to absorb the bending force acting on the piston rod of the hydraulic cylinder".

In the braking device of the aforementioned rail-mounted machine, the aforementioned elastic member is embedded in the "lower surface of the support bracket protruding from the lower balance beam" and "fixed under the support bracket by a connecting member" Between the back of the cylinder body of the aforementioned hydraulic cylinder" on the surface, Preferably, the front end of the piston rod of the hydraulic cylinder is locked into the pressing frame.

In addition, the brake device of the track-traveling machine may include a metal plate that is inserted between the "elastic member" and the "back of the cylinder body of the hydraulic cylinder". [Effects of the invention]

According to the brake device of the track-walking machine of the present invention, it is possible to achieve the excellent effect of not being limited to the installation place during the transformation, and improving the freedom of installation.

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

Figures 2 to 5 are embodiments of the braking device of the track-walking machine of the present invention. In the drawings, the parts denoted with the same symbols as those in Figure 1 represent the same components.

In the container crane 1 as the rail-mounted machine shown in FIG. 2, between the supporting legs 6 of the crane body 5, there is provided a lower frame 6a that "extends along the rail 4 in order to connect the supporting legs 6". On the bottom side of the lower frame 6a, a plurality of (two in the example of FIG. 2) traveling devices 8 are provided.

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 middle part of the upper balance beam 9a is supported by a rocking pin 10a that "extends in a horizontal direction at right angles to the traveling direction", and is swingably arranged on the bottom surface side of the lower frame 6a. The middle part of the balance beam 9b is supported by a rocking pin 10b that "extends in a horizontal direction at right angles to the traveling direction", and is swingably arranged at both ends of the upper balance beam 9a in the traveling direction. The middle part of the lower balance beam 9c is supported by a rocking pin 10c that "extends in a horizontal direction at right angles to the traveling direction", and is swingably arranged at both ends of the middle balance beam 9b in the traveling direction.

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

In the example shown in FIG. 2, "balance device 9A formed by upper balance beam 9a and middle balance beam 9b" and "balance device 9B formed by middle balance beam 9b and lower balance beam 9c", Form the upper and lower two layers. By the way, the upper balance beam 9a in the aforementioned balance device 9A on the upper level becomes the upper balance beam, and the middle balance beam 9b becomes the lower balance beam. In addition, the middle part balance beam 9b in the aforementioned 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, it is also possible to correspond to the scale of the container crane 1 as the track-traveled machine. The balance device 9A forms only one layer, and the lower balance beam (in this case, the middle balance beam 9b) is arranged on the traveling Wheel 7. In addition, the aforementioned balance device may be formed into three or more upper and lower levels, and traveling wheels 7 that can roll freely along the rail 4 are arranged at both ends of the lower balance beam of the lowermost balance device in the traveling direction.

The aforementioned lower balance beam 9c (lower balance beam) is constructed in the following manner: a plurality of sheets (two in the example of FIGS. 3 and 4) plates 9cp are arranged at intervals in the width direction of the rail 4, and are arranged in the width direction of the rail 4 at intervals. Connected plates 9cq are arranged between the plates 9cp.

The aforementioned traveling devices 8 are respectively provided with brake mechanisms 40. However, it is not necessary to dispose the brake mechanism 40 in each of the aforementioned traveling devices 8, and as long as a sufficient braking force can be obtained, there is no problem even if the brake mechanism 40 is one.

The brake mechanism 40 is mounted on a lower balance beam 9c (lower balance beam) on which the traveling wheels 7 are arranged, and as shown in FIG. 3, it includes a pressing frame 50, a hydraulic cylinder 13, and a brake pad 12.

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

The hydraulic cylinder 13 of the brake mechanism 40 is embedded between "the horizontal ends of the pressing frame 50 and the rail 4 perpendicular to each other" and the "both sides of the lower balance beam 9c (lower balance beam)" to encourage The aforementioned pressing frame 50 moves up and down.

A fixed frame 51 is attached to the lower balance beam 9c (lower balance beam), and the cylinder body 13a of the hydraulic cylinder 13 is interposed between an elastic member 60 (for example, urethane rubber, etc.) and a metal plate 70 (for example, Steel plate etc.) are fixed to the lower surface of the support bracket 52 projecting from the fixing frame 51 by a connecting member 80 such as bolts.

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.

The fixed frame 51 is provided with stopper portions 51a facing both ends of the pressing frame 50 in the longitudinal direction of the rail 4, and the stopper portion 51a is formed to restrict the movement of the pressing frame 50 in the longitudinal direction of the rail 4 (please refer to Figure 3 and Figure 4).

Although the aforementioned hydraulic cylinder 13 is provided with two on one side as shown in FIG. 4, the number can be set to one or three or more as needed.

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 to allow working fluid such as oil to be freely supplied and discharged to the cap side chamber 13c and the rod side chamber 13d of the hydraulic cylinder 13 and to urge the hydraulic cylinder 13 to expand and contract. The structure will be described in detail below.

The aforementioned hydraulic unit 14 includes: a pressure feed pipe 16 extending from the reservoir 15 where the operating fluid is stored; a cap side pipe 17 connected to the cap side chamber 13c of the hydraulic cylinder 13 (the chamber on the side where the piston rod 13b does not protrude) ); the rod side pipeline 18, connected to the rod side chamber 13d of the hydraulic cylinder 13 (the chamber on the side where the piston rod 13b protrudes); the return pipeline 19, leading to the aforementioned storage tank 15. On the way of the aforementioned pressure-feeding pipeline 16 is provided: a pump 21, which is driven by a motor 20; and a check valve 22, which is used to prevent the back flow of the actuating fluid pressure-sent by the pump 21. The pressure supply line 16 and the return line 19, the cap side line 17 and the rod side line 18 are connected through a solenoid valve 23, and a pressure accumulator 25 is connected to the pressure accumulating line 24, the pressure accumulating tube The path 24 diverges from the pressure feed line 16 on the way between the check valve 22 and the solenoid valve 23 described above.

The solenoid valve 23 has a brake actuation position 23A and a brake release position 23B. The aforementioned brake actuating position 23A is for introducing the "operating fluid pressure delivered by the aforementioned pump 21" into the cap chamber 13c of the hydraulic cylinder 13 by connecting the aforementioned pressure feed pipe 16 with the cap side pipe 17, and And by connecting the rod-side pipe 18 with the return pipe 19, the "actuating fluid of the rod-side chamber 13d of the hydraulic cylinder 13" is discharged to the position where the tank 15 is discharged. The brake release position 23B connects the pressure feed pipe 16 with the rod side pipe 18 to introduce the "operating fluid pressure delivered by the pump 21" into the rod chamber 13d of the hydraulic cylinder 13, and By connecting the cap side pipeline 17 with the return line 19, the "actuating fluid of the cap side chamber 13c of the hydraulic cylinder 13" is discharged to the position of the reservoir 15. The solenoid valve 23 stops the power supply to the solenoid (solenoid) during an emergency stop (when the power must be cut off in an emergency) and power failure, and is mechanically switched to the aforementioned brake actuation position 23A by spring force.

On the way of the pressure feeding pipeline 16 between the aforementioned pump 21 and the check valve 22, a release pipeline 26 leading to the aforementioned storage tank 15 is branched and connected, and on the way of the release pipeline 26 is provided: when the aforementioned pressure delivery pipeline When the pressure of the operating fluid of 16 becomes higher than the set pressure, the release valve 27 is opened to return the operating fluid to the reservoir 15.

There is a high-level pressure switch 28H on the way of the aforementioned pressure accumulating pipe 24, which will act when the pressure of the operating fluid of the pressure accumulating pipe 24 has reached the high-order set pressure; a low-level pressure switch 28L, when the pressure accumulating pipe 24 is When the pressure of the operating fluid has reached the low-level set pressure, the valve will be activated; the shut-off valve 28V will normally open (normally open), and will be closed when the high-level pressure switch 28H is activated. The result is that when the pressure of the operating fluid in the pressure accumulating pipe 24 has reached the set pressure of the accumulator 25, the high-level pressure switch 28H is activated, and the motor 20 of the pump 21 is actuated by the control device not shown in the figure. A stop command is output, and the shutoff valve 28V is closed. In addition, when the pressure is lower than the set pressure of the accumulator 25, the low-level pressure switch 28L is activated, and the motor 20 of the pump 21 is output and driven by the control device Command and open the aforementioned shut-off valve 28V.

On the way of the aforementioned pressure accumulating pipe 24 is connected a drain pipe 29 used to discharge the operating fluid of the aforementioned accumulator 25 to the storage tank 15 during maintenance, etc. The drain pipe 29 is provided with: A manual switching valve 30 opened and closed by an operator.

Next, the effect of the above-mentioned embodiment will be explained.

As shown in FIG. 3, in the state where the solenoid valve 23 of the hydraulic unit 14 has been switched to the brake release position 23B, the pressure feed line 16 communicates with the rod side line 18, so that the "actuation of the pressure sent by the pump 21" The "fluid" is introduced into the rod side chamber 13d of the hydraulic cylinder 13, and the "actuating fluid of the cap side chamber 13c of the hydraulic cylinder 13" is discharged to the storage tank 15 through the cap side pipe 17 and the return pipe 19 communicating. In this way, the piston rod 13b moves in the contraction direction inside the hydraulic cylinder 13 to pull the pressing frame 50 upward, and the brake pad 12 integrated with the pressing frame 50 separates from the running wheel rolling surface 4a of the rail 4 to separate The brake is released, and the container crane 1 becomes walkable.

On the other hand, if from the state shown in FIG. 3, as shown in FIG. 5, when the solenoid valve 23 of the hydraulic unit 14 is switched to the brake actuation position 23A, the pressure feed pipe 16 is connected to the cap side pipe 17. Introduce the "operating fluid pumped by the pump 21" into the cap side chamber 13c of the hydraulic cylinder 13, and connect the rod side pipe 18 and the return pipe 19 to connect the rod side chamber 13d of the hydraulic cylinder 13 The actuating fluid is discharged toward the storage tank 15. In this way, the piston rod 13b of the hydraulic cylinder 13 moves in the protruding direction to press down the pressing frame 50, and the brake pad 12 integrated with the pressing frame 50 is pressed against the running wheel rolling surface 4a of the rail 4 to perform braking.

When the pressure of the operating fluid in the accumulating pipe 24 has reached the high-level set pressure of the accumulator 25, the high-level pressure switch 28H is activated, and a control device not shown in the figure outputs a stop command to the motor 20 of the pump 21 , And close the aforementioned shut-off valve 28V. In addition, when the pressure is lower than the low-level set pressure of the accumulator 25, the low-level pressure switch 28L is activated, and the control device outputs a drive command to the motor 20 of the pump 21 and opens the shut-off valve 28V. In this way, the aforementioned pressure accumulator 25 normally accumulates the pressure to a pressure between the high-level set pressure and the low-level set pressure. Moreover, the solenoid valve 23 stops the power supply to the solenoid coil during an emergency stop or power failure, and mechanically switches to the brake actuation position 23A by spring force. In addition, the aforementioned shut-off valve 28V is normally opened (Normally open), and is activated (opened) when an emergency stop or a power failure occurs. Therefore, during an emergency stop or a power failure, the operating fluid stored in the accumulator 25 is guided from the accumulator line 24 through the cap side line 17 to the rod side chamber 13c of the hydraulic cylinder 13 to make the piston rod 13b Moving in the protruding direction, the aforementioned brake pad 12 is pressed against the running wheel rolling surface 4a of the rail 4. As a result, even if the pump 21 is stopped during an emergency stop and a power failure, the brake can be activated.

Here, the hydraulic cylinder 13 is usually formed as the back side of the cylinder body 13a, the pin is connected to a member that becomes a base, and the tip of the piston rod 13b is connected to a drivable member. However, in this type of pin connection structure, the problem of "longer overall length and greater restriction on the installation place" cannot be avoided due to the above-mentioned structure.

In contrast, in the case of this 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 the connecting member 80 although the elastic member 60 and the metal plate 70 are interposed. 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 the nut 90, and the pin connection structure is not adopted. Therefore, since the overall length is shortened, it becomes a very advantageous structure.

With this, when retrofitting a rail-mounted machine such as an existing container crane 1, even if it is impossible to install a conventional braking device as described in Patent Document 2 on the "support foot 6 connected to the crane body 5." In the case of the lower part of the lower frame 6a (please refer to FIG. 2), the brake mechanism 40 can also be provided in the lower part of the traveling device 8.

In addition, in the case where the pin connection structure is not adopted, when the aforementioned brake mechanism 40 is actuated, a bending force acts on the piston rod 13 b 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 shortening the life of the hydraulic cylinder 13 can be avoided. In addition, by providing 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. Not only that, the aforementioned bending force is absorbed by the elastic member 60, and the installation accuracy of the support bracket 52 by the hydraulic cylinder 13 is no longer strictly required. Therefore, the mechanical processing of the surface of the support bracket 52 is no longer required, which in turn reduces the cost.

In this way, the restriction on the installation place during the renovation is eliminated, and the degree of freedom of installation can be improved.

Figure 6 is a reference example of the brake device of the rail-mounted machine of the present invention. In the figure, the parts with the same symbols as those in Figures 2 to 5 represent the same components, and the basic structure is the same as that shown in Figures 2 to 5 The embodiment is the same.

In the case of this reference example, a base 65 formed of an elastic member such as chloroprene rubber is arranged on the upper surface side of the support bracket 52, and the connecting member 80 is inserted through the base 65. By locking, the aforementioned hydraulic cylinder 13 is fixed to the lower surface of the support bracket 52.

Next, the effect of the above reference example will be explained.

In this reference example, although only "the total length of the installed base 65 is increased", when the brake 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 it is also absorbed by the base 65. As the movable range of the hydraulic cylinder 13 becomes wider, the effect of "making problems less likely to occur" can be further improved, and it is more beneficial to avoid shortening the life of the hydraulic cylinder 13.

The other functions are the same as those of the embodiment shown in FIGS. 2 to 5, so the description is omitted.

Next, in the case of the embodiment shown in FIGS. 2 to 5, the elastic member 60 is embedded in 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 aforementioned Press the frame 50. If configured as described above, the installation of the hydraulic cylinder 13 does not adopt a pin connection structure, and the total length is shortened, and the brake mechanism 40 can be installed in the lower part of the aforementioned traveling device 8.

In addition, in the case of the embodiment shown in FIGS. 2 to 5, a metal plate 70 is provided between "the aforementioned elastic member 60" and "the back surface of the cylinder body 13a of the hydraulic cylinder 13". If configured 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 rail-mounted machine of the present invention is not limited to the above-mentioned embodiment, and various changes can of course be added without departing from the gist of the present invention.

1: Container crane (track walking machinery) 2: Harbor 3: quay wall 4: track 4a: Rolling surface of traveling wheel 5: Crane body 6: Support feet 6a: Lower frame 7: Walking 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) 9cp: plate 9cq: Plate 10a: rocker pin 10b: Shake pin 10c: Shake pin 12: brake pad 13: hydraulic 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 line 20: Motor 21: Pump 22: Check valve 23: Solenoid valve (solenoid valve) 23A: Brake actuation position 23B: Brake release position 24: Pressure accumulating pipeline 25: Accumulator 26: release line 27: relief valve 28H: higher order pressure switch 28L: low order pressure switch 28V: shut off valve 29: Drain line 30: Manual switch valve 40: brake mechanism 50: Press the frame 51: fixed frame 51a: Stopper part 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-mounted machine. [Fig. 2] is a front view showing an embodiment of the braking device of the rail-mounted machine of the present invention. Fig. 3 is a schematic structural diagram showing an embodiment of the brake device of the rail-mounted machine of the present invention, and is a diagram showing a state where the brake has been released. [Fig. 4] is a view from the arrow direction of IV-IV in Fig. 3. [Fig. [Fig. 5] is a schematic configuration diagram showing an embodiment of the braking device of the rail-mounted machine of the present invention, and is a diagram showing a state in which braking is performed. Fig. 6 is a schematic configuration diagram showing a reference example of the brake device of the rail-mounted machine of the present invention, and is a diagram showing a state where the brake has been released.

1: Container crane (track walking machinery)

3: quay wall

4: track

4a: Rolling surface of traveling wheel

5: Crane body

6: Support feet

6a: Lower frame

7: Walking 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: brake mechanism

Claims (3)

A braking device for a rail-traveling machine is the braking device of a rail-traveling machine as follows: it has at least one layer of balance device formed by an upper balance beam and a pair of lower balance beams, and is provided with a balance device on the lowermost layer Both ends of the lower balance beam in the traveling direction are equipped with traveling devices that can freely roll along the rails. The middle part of the upper balance beam is composed of swing pins extending in the horizontal direction at right angles to the traveling direction. The lower part of the pair of lower balance beams, the middle part of which is supported by the pair of lower balance beams, is supported by a rocking pin extending in a horizontal direction at right angles to the walking direction, and is swayably arranged at the lower part of the supporting foot walking on the rail. And it can be swayed freely at both ends of the upper balance beam in the traveling direction, Its characteristics are: Equipped with a brake mechanism, the brake mechanism has: a pressing frame, arranged between the lower balance beam of the lowermost balance device and the rail, so as to extend toward the horizontal direction perpendicular to the rail; and a hydraulic cylinder, embedded in Between the horizontal ends of the pressing frame perpendicular to the rail and the two side surfaces of the balance beam under the lowermost level of the balance device, and urge the pressing frame to rise and fall; and the brake pads are installed under the pressing frame surface, The aforementioned hydraulic cylinder is fixed by an elastic member for absorbing the bending force acting on the piston rod of the hydraulic cylinder. The brake device for a rail-mounted machine described in claim 1, wherein the elastic member is embedded in: the lower surface of the support bracket protruding from the lower balance beam, and is fixed to the support bracket by a connecting member Between the back of the cylinder body of the aforementioned hydraulic cylinder on the lower surface of the frame, The front end of the piston rod of the hydraulic cylinder is locked into the pressing frame. The brake device of a rail-mounted machine according to claim 2, which includes a metal plate that is embedded between the elastic member and the back surface of the cylinder body of the hydraulic cylinder.

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