JP7137429B2 - Emergency braking system for tracked machines - Google Patents

Description

The present invention relates to an emergency braking system for a tracked machine.

FIG. 5 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. 5 on the traveling path 3a of FIG. A traveling device 8 is attached.

If the container crane 1 is hit by a strong wind during cargo handling work, it may not stop traveling against the will of the driver and may run away, resulting in collision with adjacent machines or adjacent structures or collapse. .

For this reason, conventionally, there is a clamping device as disclosed in Patent Document 1, for example, as a device for preventing runaway of the track traveling type machine as described above. The clamping device includes a pinching mechanism in which a pair of contactors having pinching portions formed at their distal ends are connected so that their substantially intermediate portions are rotatable about an axis, and a proximal end of the contactor in the pinching mechanism. a spring mechanism which is provided at the base of the contactor and narrows the distance between the base ends of the contactor so as to rotate the contactor in a closing direction in which the pinching portion always sandwiches the rail; and a rotating cam for driving the cam receiving portion formed in the inner side of the cam receiving portion in a direction to open the rail to release the clamping portion of the rail.

However, since the clamping device disclosed in Patent Document 1 employs a method of clamping the rail from both sides, the contact surface on the side of the clamping device may be provided with jagged teeth in order to increase the coefficient of friction with the rail surface. Or, if the contact surface is hardened and made like a file, there is a possibility that the side surface of the rail will be damaged. In addition, when the precision of the side surface of the rail is low and the dimension from the center line to the side surface in the width direction varies from left to right, or when the rail is corroded, etc. There is also a possibility that the tightening force is greatly reduced because the tightening is not performed uniformly, and sufficient holding force cannot be obtained.

In order to solve such a problem, a braking device has been developed that has a fluid pressure cylinder, such as a hydraulic cylinder, that can freely press and separate a brake pad in a direction perpendicular to the rolling surface of the running wheel of the rail (see, for example, Patent Documents 2).

JP-A-6-72690 JP 2015-63384 A

However, in the case of a braking device such as that disclosed in Patent Document 2, a fluid pressure unit with a complicated structure such as a hydraulic unit equipped with a pump driven by a motor is essential, and maintenance costs a lot of money. had a drawback.

Since the runaway of the track traveling type machine does not occur frequently and the frequency of use of the braking device is low, an improvement has been desired from the viewpoint of cost reduction.

Also, it is necessary to pay attention to environmental protection so that fluid such as oil does not leak from the fluid pressure unit such as the hydraulic unit.

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems, and aims to provide an emergency braking device for a track traveling machine that can eliminate the need for a fluid pressure unit such as a hydraulic unit, reduce maintenance costs, and improve the environment. and

The present invention is an emergency braking device for a track traveling machine equipped with a traveling device having traveling wheels that can freely roll along rails,
a fluid pressure cylinder capable of pressing and separating the brake pad against the running wheel rolling surface of the rail in a direction orthogonal to the rail;
a high-pressure gas cylinder filled with high-pressure gas as an energy source for operating the fluid pressure cylinder ;
a high-pressure gas line that introduces high-pressure gas into the cap-side chamber of the fluid pressure cylinder;
a main valve provided in the high-pressure gas line and opened when the main power source of the track traveling machine is turned on;
an emergency stop valve provided in the high-pressure gas line downstream of the main valve and opened when the control power source for the track traveling machine is turned off in response to an emergency stop command issuance;
It relates to an emergency braking system for a tracked machine with a

Also, a relief valve may be provided to prevent a pressure rise in the cap-side chamber of the fluid pressure cylinder due to the undulation of the rail when the fluid pressure cylinder is operated by opening the emergency stop valve.

Further, in the emergency braking device for the track traveling type machine, a pressure switch for detecting the pressure of the high-pressure gas filled in the high-pressure gas cylinder and outputting an operation signal when the pressure becomes less than the lower limit set value. ,
and an alarm for instructing replacement of the high-pressure gas cylinder based on an actuation signal output from the pressure switch.

According to the emergency braking device of the track traveling machine of the present invention, it is possible to eliminate the need for a fluid pressure unit such as a hydraulic unit, and it is possible to achieve the excellent effects of reducing maintenance costs and improving the environment.

1 is a front view showing an embodiment of an emergency braking device for a track traveling machine of the present invention; FIG. 1 is a schematic configuration diagram showing an embodiment of an emergency braking device for a track traveling machine according to the present invention, showing a state in which braking is not performed during normal operation; FIG. 1 is a schematic configuration diagram showing an embodiment of an emergency braking device for a track traveling machine according to the present invention, showing a state in which braking is performed during an emergency stop; FIG. 1 is a flow chart illustrating an embodiment of an emergency braking system for a tracked machine of the present invention; 1 is an overall side view showing an example of a container crane as a track traveling machine; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 4 show an embodiment of an emergency braking system for a track traveling machine according to the present invention, and in the figures, the same reference numerals as in FIG. 5 represent the same parts.

In a container crane 1 as a rail traveling machine shown in FIG. A plurality of (two in the example of FIG. 1) traveling devices 8 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. As shown in FIG.

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

The running wheels 7 are arranged so as to be free to roll along the rails 4 at both ends of the lower equalizer beam 9c in the running direction.

In the example shown in FIG. 1, an equalizer device 9A consisting of an upper equalizer beam 9a and an intermediate equalizer beam 9b, and an equalizer device 9B consisting of an intermediate equalizer beam 9b and a lower equalizer beam 9c are formed in two upper and lower stages. It is Incidentally, the upper equalizer beam 9a in the upper equalizer device 9A becomes an upper equalizer beam, and the intermediate equalizer beam 9b becomes a lower equalizer beam. In the lower equalizer device 9B, the intermediate equalizer beam 9b relatively becomes the upper equalizer beam, and the lower equalizer beam 9c relatively becomes the lower equalizer beam. However, according to the scale of the container crane 1 as the track traveling machine, only one stage of the equalizer device 9A is formed, and the traveling wheels 7 are arranged on the lower equalizer beam (in this case, the intermediate equalizer beam 9b). You can Also, the equalizer devices may be arranged in three or more stages, and running wheels 7 that can freely roll along the rails 4 may be arranged at both ends of the lower equalizer beam in the running direction of the lowermost equalizer device.

An emergency braking device 40 is arranged on the bottom side of the upper equalizer beam 9a.

The emergency braking device 40 is attached to a brake bracket 51 held on the bottom side of the upper equalizer beam 9a, and as shown in FIGS. source 100; The emergency braking device 40 can also be arranged on the bottom side of the lower equalizer beam 9c shown in FIG.

The fluid pressure cylinder 13 of the fluid pressure actuator includes a fluid pressure cylinder main body 13a, a fluid pressure piston 13b, and a piston rod 13c. The fluid pressure cylinder main body 13a is suspended below the brake bracket 51 via a support pin 51a extending in a horizontal direction orthogonal to the rail 4, and is mounted inside an outer case 52 provided below the brake bracket 51. It is attached downward in such a way that it is inserted into the The fluid pressure piston 13b is slidably fitted inside the fluid pressure cylinder main body 13a, and defines the inside of the fluid pressure cylinder main body 13a into a cap-side chamber 13d and a rod-side chamber 13e. The piston rod 13c extends downward from the hydraulic piston 13b through a rod-side chamber 13e. It is connected to the rail 4 so that it can be pressed and separated in a direction orthogonal to the rail 4 . Inside the fluid pressure cylinder main body 13a (rod-side chamber 13e) of the fluid pressure cylinder 13, a compression spring S2 as an elastic member S extending in the vertical direction is loaded so as to bias the piston rod 13c in the direction of retraction.

The simple drive source 100 includes a high-pressure gas cylinder 110, a high-pressure gas line 120, a main valve 130, an emergency stop valve 140, a relief valve 150, a pressure switch 160, and an alarm 170.

The high-pressure gas cylinder 110 is a cylinder filled with high-pressure gas (for example, nitrogen gas) as an energy source for operating the fluid pressure cylinder 13 . Although one high pressure gas cylinder 110 is shown in FIGS. 2 and 3, it goes without saying that the number of cylinders may be increased to a plurality as required.

The high-pressure gas line 120 is a line that introduces high-pressure gas into the cap-side chamber 13 d of the fluid pressure cylinder 13 .

The main valve 130 is provided in the high-pressure gas line 120 and is opened when the main power supply of the container crane 1 as a track traveling machine is turned on.

The emergency stop valve 140 is provided in the high-pressure gas line 120 on the downstream side of the main valve 130, and is opened when the control power source for the container crane 1 is turned off due to issuance of an emergency stop command. Incidentally, the emergency stop command is issued when the operator presses an emergency stop button (not shown).

The relief valve 150 prevents a pressure rise in the cap-side chamber 13d of the fluid pressure cylinder 13 due to the undulation of the rail 4 when the fluid pressure cylinder 13 is operated by opening the emergency stop valve 140 . In the example shown in FIGS. 2 and 3, the relief valve 150 is provided in an exhaust-only gas line 151 branched from the high-pressure gas line 120 on the downstream side of the emergency stop valve 140. 151 may be directly connected to the cap-side chamber 13 d separately from the high-pressure gas line 120 , and the relief valve 150 may be provided in the gas line 151 exclusively for exhaust.

The pressure switch 160 detects the pressure P of the high-pressure gas filled in the high-pressure gas cylinder 110, and outputs an actuation signal 161 when the pressure P becomes less than the lower limit set value _P0 (P< _P0 ). It's like

The alarm device 170 instructs replacement of the high-pressure gas cylinder 110 based on an actuation signal 161 output from the pressure switch 160 . The instruction to replace the high-pressure gas cylinder 110 may be either an instruction by voice or an instruction by screen display.

A pressure reducing valve 180 is provided in the high pressure gas line 120 on the downstream side of the main valve 130, and when the secondary side (delivery side) pressure P of the pressure reducing valve 180 _rises above the upper limit set value PM, Excess pressure higher than that pressure is released to the outside through the discharge valve 181 .

Further, a throttle 190 is provided in the high-pressure gas line 120 on the downstream side of the emergency stop valve 140 so that the pressure in the cap-side chamber 13d does not suddenly rise when the emergency stop valve 140 is opened.

Further, a discharge line 152 is branched from the high-pressure gas line 120 on the downstream side of the throttle 190 , and the discharge line 152 is provided with a manual opening/closing valve 153 and a discharge valve 154 .

A pressure gauge 162 is provided in the high-pressure gas line 120 on the upstream side of the emergency stop valve 140 to indicate the pressure P of the high-pressure gas.

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

First, it is determined whether or not the main power supply of the container crane 1 as a track traveling machine is ON (see step S10 in FIG. 4). Thus, the main valve 130 is opened and maintained in that state (see step S20 in FIG. 4). If the main power supply is not ON but OFF, nothing is done and the control ends.

At this time, the emergency stop valve 140 is closed as shown in FIG. 2, and the piston rod 13c is moved in the direction of contraction inside the fluid pressure cylinder 13 by the biasing force of the compression spring S2 as the elastic member S, and the brake is applied. The pad 12 is separated from the traveling wheel rolling surface 4a of the rail 4, the braking is released, and the container crane 1 can travel. In this state, the container crane 1 is normally operated.

During normal operation of the container crane 1, it is always determined whether or not an emergency stop command has been issued (see step S30 in FIG. 4). When an emergency stop command is issued at , the control power supply is turned off (see step S40 in FIG. 4).

When the control power supply is turned off, as shown in FIG. 3, the emergency stop valve 140 is opened (see step S50 in FIG. 4), and the high pressure gas filled in the high pressure gas cylinder 110 is introduced into the cap side chamber 13d of the fluid pressure cylinder 13. be done. As a result, the piston rod 13c of the fluid pressure cylinder 13 moves in the projecting direction against the biasing force of the compression spring S2 as the elastic member S, and the fluid pressure cylinder 13 is extended (step S60 in FIG. 4). ), the brake pad 12 is pressed against the running wheel rolling surface 4a of the rail 4 to perform braking.

At this time, if the secondary side (delivery side) pressure P of the pressure reducing valve 180 _rises above the upper limit set value PM, excess pressure above that pressure is released to the outside through the discharge valve 181 . Further, since the high-pressure gas line 120 on the downstream side of the emergency stop valve 140 is provided with a throttle 190, the pressure in the cap-side chamber 13d can be prevented from rising sharply when the emergency stop valve 140 is opened. Furthermore, a relief valve 150 is provided in an exhaust exclusive gas line 151 branched from the high pressure gas line 120 on the downstream side of the emergency stop valve 140 . Therefore, even if the rail 4 undulates in the vertical direction, the cap-side chamber 13d of the fluid pressure cylinder 13 expands due to the undulation of the rail 4 when the fluid pressure cylinder 13 is operated by opening the emergency stop valve 140. Pressure rise is prevented. As a result, application of a useless load to the fluid pressure cylinder 13 can be avoided.

When the braking by the fluid pressure cylinder 13 is released, the emergency stop valve 140 is closed and then the manual opening/closing valve 153 is opened. It is discharged from the open/close valve 153 to the outside through the discharge valve 154 . As a result, the piston rod 13c moves in a contracting direction inside the fluid pressure cylinder 13 due to the biasing force of the compression spring S2 as the elastic member S, and the brake pad 12 separates from the running wheel rolling surface 4a of the rail 4. , the braking is released, and the container crane 1 becomes ready to travel again.

On the other hand, the pressure P of the high-pressure gas filled in the high-pressure gas cylinder 110 is detected by the pressure switch 160, and it is determined whether or not the pressure P is less than the lower limit set value _P0 (P< _P0 ). is performed (see step S70 in FIG. 4).

When the pressure P is less than the lower limit set value P ₀ (P<P ₀ ), the pressure switch 160 outputs an operation signal 161 to the alarm device 170, and the alarm device 170 prompts replacement of the high-pressure gas cylinder 110. When instructed, the high-pressure gas cylinder 110 is replaced (see step S80 in FIG. 4).

In the case of this embodiment, unlike the braking device disclosed in Patent Document 2, there is no need for a fluid pressure unit with a complicated structure, such as a hydraulic unit having a pump driven by a motor. You don't have to spend a lot of money.

In addition, since there is no fluid pressure unit such as the hydraulic unit and fluid such as oil does not leak, it is advantageous in terms of environmental protection.

In this way, a fluid pressure unit such as a hydraulic unit can be made unnecessary, thereby reducing maintenance costs and improving the environment.

In the case of this embodiment, a high-pressure gas line 120 for introducing high-pressure gas into the cap-side chamber 13d of the fluid pressure cylinder 13 is provided. With this configuration, the high-pressure gas filled in the high-pressure gas cylinder 110 can be efficiently supplied to the cap-side chamber 13d of the fluid pressure cylinder 13 as an energy source.

In the case of this embodiment, a main valve 130 provided in the high-pressure gas line 120 and opened when the main power source of the track traveling machine (container crane 1) is turned on, and a high-pressure gas line 120 on the downstream side of the main valve 130 It is equipped with an emergency stop valve 140 which is provided and opens when the control power supply of the track traveling machine (container crane 1) is turned off in response to issuance of an emergency stop command. With this configuration, by opening the emergency stop valve 140 while the main valve 130 is open, high-pressure gas can be stably supplied to the cap-side chamber 13d of the fluid pressure cylinder 13 .

Furthermore, in the case of this embodiment, a relief valve 150 is provided to prevent pressure rise in the cap-side chamber 13d of the fluid pressure cylinder 13 due to the undulation of the rail 4 when the fluid pressure cylinder 13 is operated by opening the emergency stop valve 140. . With this configuration, it is possible to prevent pressure rise in the cap-side chamber 13d of the fluid pressure cylinder 13 due to the undulation of the rail 4 when the fluid pressure cylinder 13 is operated by opening the emergency stop valve 140. This is effective in avoiding unnecessary load on 13 .

Further, in this embodiment, a pressure switch 160 that detects the pressure P of the high-pressure gas filled in the high-pressure gas cylinder 110 and outputs an operation signal 161 when the pressure P _becomes less than the lower limit set value P0, and an alarm device 170 for instructing replacement of the high-pressure gas cylinder 110 based on an actuation signal 161 output from the pressure switch 160 . With this configuration, the replacement timing of the high-pressure gas cylinder 110 can be grasped without missing, and maintainability can be improved.

The emergency braking system for a track traveling machine according to the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the scope of the present invention.

1 Container crane (orbital running machine)
2 harbor 3 quay wall 3a running path 4 rail 4a running wheel rolling surface 5 crane body 6 support leg 6a lower frame 7 running wheel 8 running device 9A equalizer device 9B equalizer device 9a upper equalizer beam 9b intermediate equalizer beam 9c lower equalizer beam 10a Rocker pin 10b Rocker pin 10c Rocker pin 12 Brake pad 13 Fluid pressure cylinder 13a Fluid pressure cylinder body 13b Fluid pressure piston 13c Piston rod 13d Cap side chamber 13e Rod side chamber 40 Emergency braking device 51 Brake bracket 51a Support pin 52 Outer case 100 Simple drive Source 110 High-pressure gas cylinder 120 High-pressure gas line 130 Main valve 140 Emergency stop valve 150 Relief valve 151 Exhaust gas line 152 Exhaust line 153 Manual opening/closing valve 154 Exhaust valve 160 Pressure switch 161 Operation signal 162 Pressure gauge 170 Alarm 180 Pressure reducing valve 181 Exhaust valve 190 throttle P pressure P ₀ lower limit set value S elastic member S2 compression spring

Claims (3)

An emergency braking device for a track traveling machine equipped with a traveling device having traveling wheels that can freely roll along rails,
a fluid pressure cylinder capable of pressing and separating the brake pad against the running wheel rolling surface of the rail in a direction orthogonal to the rail;
a high-pressure gas cylinder filled with high-pressure gas as an energy source for operating the fluid pressure cylinder ;
a high-pressure gas line that introduces high-pressure gas into the cap-side chamber of the fluid pressure cylinder;
a main valve provided in the high-pressure gas line and opened when the main power source of the track traveling machine is turned on;
an emergency stop valve provided in the high-pressure gas line downstream of the main valve and opened when the control power source for the track traveling machine is turned off in response to an emergency stop command issuance;
Emergency braking system for tracked machines with 2. An emergency braking device for a track traveling machine according to claim 1 , further comprising a relief valve for preventing a pressure rise in the cap-side chamber of the fluid pressure cylinder due to undulation of the rail when the fluid pressure cylinder is operated by opening the emergency stop valve. a pressure switch that detects the pressure of the high-pressure gas filled in the high-pressure gas cylinder and outputs an operation signal when the pressure is less than a lower limit set value;
3. An emergency braking system for a track traveling machine according to claim 1 or 2 , further comprising: an alarm for instructing replacement of the high-pressure gas cylinder based on an actuation signal output from said pressure switch.

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