JP6899704B2 - Rail clamp device for orbital traveling machines - Google Patents

Description

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

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

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

Therefore, as a device for preventing the escape of the track traveling type machine as described above, there is a rail clamp device as disclosed in, for example, Patent Document 1 in the past.

The rail clamp device includes a pinching mechanism in which a pair of contacts (clamp arms) having a pinching portion (shoe) formed at the tip thereof are connected so that a substantially intermediate portion thereof can rotate around an axis, and the pinching mechanism. A spring mechanism provided at the base end portion of the contactor in the mechanism and narrowing between the base end portions of the contactor so that the sandwiching portion always rotates the contactor in a closing direction that sandwiches the rail, and the above. It is provided with a rotary cam for driving a cam receiving portion formed at the base end portions of the pair of contacts in a direction of pushing open from the inside thereof to release the pinching of the rail by the sandwiching portion.

Further, Patent Document 2 also provides a general technical level related to the rail clamp device.

Japanese Unexamined Patent Publication No. 6-72690 Japanese Patent No. 5781560

By the way, in an orbital traveling machine such as the container crane 1, the accuracy of the side surface of the rail 4 is low, and the dimensions from the center line to the side surface in the width direction may vary from side to side. In some cases, the rail 4 is deformed due to wear, corrosion, or the like.

However, in the rail clamping device as disclosed in Patent Documents 1 and 2, a method of sandwiching the rail from both sides by the urging force of the compression spring is adopted, so that the spring constant of the compression spring is constant. , The force for pinching the side surface of the rail cannot be adjusted according to the variation and deformation, the pinching by the shoe is not performed uniformly, and the tightening force is greatly reduced, so that a sufficient holding force is obtained. There was a possibility that it would not be possible.

Further, if the shoe is not uniformly sandwiched, uneven wear of the side surface of the rail and the shoe is likely to occur, which may lead to shortening of the life of the rail clamping device.

Furthermore, in the rail clamping device as described above, it is extremely important that both side surfaces of the rail can be reliably clamped at the time of emergency stop (when the power is cut off intentionally in an emergency) and at the time of power failure.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to obtain a stable holding force, suppress uneven wear of the contact surface and extend the life, and at the time of an emergency stop when the power supply is cut off. In addition, it is an object of the present invention to provide a rail clamp device for a track-traveling machine capable of reliably sandwiching both side surfaces of a rail even in the event of a power failure.

In order to achieve the above object, the rail clamp device of the track traveling machine of the present invention is a rail clamping device of a track traveling machine provided with a traveling device in which traveling wheels that can roll along the rail are arranged. ,
A clamp arm provided with a shoe at the tip and capable of sandwiching and opening both side surfaces of the rail with the shoe.
It is stretchably arranged between the base ends of the clamp arms, and the tips of the clamp arms are brought close to each other during extension to bring the shoes into pressure contact with both side surfaces of the rail, while the tips of the clamp arms are contracted. A fluid pressure cylinder that separates the shoes from each other to open the shoe from both sides of the rail.
During normal operation, the hydraulic fluid is introduced into the fluid pressure cylinder to expand and contract the fluid pressure cylinder while accumulating pressure, while at the time of emergency stop when the power is cut off and during a power failure, the accumulated working fluid is guided to the fluid pressure cylinder. Equipped with a fluid pressure unit that extends the fluid pressure cylinder ,
The fluid pressure unit is
A pump that pumps the working fluid in the tank,
An accumulator for accumulating the working fluid pumped by the pump,
The brake operating position for introducing the working fluid pumped by the pump into the cap side chamber of the fluid pressure cylinder and discharging the working fluid in the rod side chamber of the fluid pressure cylinder to the tank, and the working fluid pumped by the pump are described. It has a brake release position that discharges the working fluid in the cap side chamber of the fluid pressure cylinder to the tank while introducing it into the rod side chamber of the fluid pressure cylinder, and switches to the brake operation position at the time of emergency stop when the power is cut off and in the event of a power failure. With a solenoid valve
While introducing the working fluid that is constantly open and pumped by the pump into the accumulator, it closes when the pressure of the working fluid in the accumulator reaches a high set pressure and is closed and the power is cut off. With a shut-off valve that guides the accumulated working fluid to the cap side chamber of the fluid pressure cylinder via the solenoid valve that has switched to the brake operating position and extends the fluid pressure cylinder.
The equipped can Rukoto.

Further, the rail clamp device of the track-traveling machine of the present invention is a rail clamp device of a track-traveling machine provided with a traveling device in which traveling wheels that can roll along the rail are arranged.
A clamp arm provided with a shoe at the tip and capable of sandwiching and opening both side surfaces of the rail with the shoe.
It is stretchably arranged between the base ends of the clamp arms, and the tips of the clamp arms are brought close to each other during extension to bring the shoes into pressure contact with both side surfaces of the rail, while the tips of the clamp arms are contracted. A fluid pressure cylinder that separates the shoes from each other to open the shoe from both sides of the rail.
During normal operation, the hydraulic fluid is introduced into the fluid pressure cylinder to expand and contract the fluid pressure cylinder while accumulating pressure, while at the time of emergency stop when the power is cut off and during a power failure, the accumulated working fluid is guided to the fluid pressure cylinder. A fluid pressure unit that extends the fluid pressure cylinder and
And a tension spring for urging in a direction to open the clamp arms,
The fluid pressure unit is
A pump that pumps the working fluid in the tank,
An accumulator for accumulating the working fluid pumped by the pump,
The brake operating position for introducing the working fluid pumped by the pump into the cap side chamber of the fluid pressure cylinder while the rod side chamber of the fluid pressure cylinder is communicated with the tank, and the rod side chamber of the fluid pressure cylinder communicate with the tank. A solenoid valve that has a brake release position that discharges the working fluid in the cap side chamber of the fluid pressure cylinder to the tank in this state, and switches to the brake operating position in the event of an emergency stop or power failure when the power supply is cut off.
While introducing the working fluid that is constantly open and pumped by the pump into the accumulator, it closes when the pressure of the working fluid in the accumulator reaches a high set pressure and is closed and the power is cut off. A shut-off valve that guides the accumulated working fluid to the cap side chamber of the fluid pressure cylinder via the solenoid valve that has switched to the brake operating position and extends the fluid pressure cylinder against the urging force of the tension spring. Can be prepared.

According to the rail clamp device of the track-traveling machine of the present invention, a stable holding force can be obtained, uneven wear of the contact surface can be suppressed, and the life can be extended. At times, it can produce an excellent effect that both sides of the rail can be securely clamped.

It is a front view which shows the Example of the rail clamp device of the track traveling type machine of this invention. It is a detailed view of Part II of FIG. It is a schematic block diagram which shows the fluid pressure cylinder and the fluid pressure unit in the Example of the rail clamp device of the track traveling type machine of this invention, and is the figure corresponding to the arrow III-III of FIG. It is a schematic block diagram which shows the modification which provided the tension spring in the Example of the rail clamp device of the track traveling type machine of this invention. It is an overall side view which shows an example of the container crane as an orbital traveling machine.

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

1 to 3 are examples of the rail clamp device of the track traveling machine of the present invention, and in the drawings, the parts having the same reference numerals as those in FIG. 5 represent the same objects.

As shown in FIG. 1, between the support legs 6 of the crane body 5 of the container crane 1 as a track-traveling machine to which a traveling device 8 having traveling wheels 7 that can roll along the rail 4 is attached. A lower frame 6a extending along the rail 4 is provided so as to connect the support legs 6. A clamp bracket 10 is hung on the bottom surface side of the lower frame 6a so as to be disposed between the traveling devices 8, and a wheel 11a that can roll along the rail 4 is provided below the clamp bracket 10. The clamp trolley 11 to have is attached. The clamp carriage 11 is equipped with a rail clamp mechanism 20 and a fluid pressure unit 50 such as a hydraulic unit.

As shown in FIGS. 2 and 3, the rail clamp mechanism 20 includes a clamp arm 21 and a fluid pressure cylinder 22.

As shown in FIGS. 2 and 3, the clamp arm 21 is a member composed of a set of two members, and is a lower end with respect to a main pin 23 pivotally supported by the clamp carriage 11 so as to extend parallel to the rail 4. A portion (tip portion) is pivotally attached, and a cylinder support pin bolt 24 extending in parallel with the rail 4 is pivotally attached to the upper end portion (base end portion) thereof. A shoe 25 is provided at the tip of the clamp arm 21.

As shown in FIGS. 2 and 3, the fluid pressure cylinder 22 is arranged so as to extend in the horizontal direction orthogonal to the rail 4 and span between the cylinder support pin bolts 24, and is supplied from the fluid pressure unit 50. It expands and contracts depending on the discharged working fluid.

The fluid pressure unit 50 is a cap connected to a pumping line 52 extending from a tank 51 in which a working fluid such as oil is stored and a cap side chamber 22a (a chamber on the side where the piston rod 22c does not protrude) of the fluid pressure cylinder 22. A side line 53, a rod side line 54 connected to a rod side chamber 22b of the fluid pressure cylinder 22 (a chamber on the side where the piston rod 22c protrudes), and a return line 55 leading to the tank 51 are provided. A pump 57 driven by a motor 56 and a check valve 58 for blocking the backflow of the working fluid pumped by the pump 57 are provided in the middle of the pressure feeding line 52. The pumping line 52 and the return line 55, the cap side line 53 and the rod side line 54 are connected via a solenoid valve 59, and from the middle of the pumping line 52 between the check valve 58 and the solenoid valve 59. An accumulator 61 is connected to the branched accumulator line 60.

The solenoid valve 59 has a brake operating position 59A and a brake releasing position 59B. The brake operating position 59A introduces the working fluid pumped by the pump 57 into the cap side chamber 22a of the fluid pressure cylinder 22 by communicating the pressure feeding line 52 and the cap side line 53, while introducing the rod side line. By communicating the 54 and the return line 55, the working fluid in the rod side chamber 22b of the fluid pressure cylinder 22 is discharged to the tank 51. In the brake release position 59B, by communicating the pressure feeding line 52 and the rod side line 54, the working fluid pumped by the pump 57 is introduced into the rod side chamber 22b of the fluid pressure cylinder 22, and the cap side is introduced. By communicating the line 53 and the return line 55, the working fluid in the cap side chamber 22a of the fluid pressure cylinder 22 is discharged to the tank 51. The solenoid valve 59 is mechanically moved to the brake operating position 59A by a spring force when the solenoid valve is stopped from being energized during an emergency stop (when an urgent intentional power failure is required) or a power failure other than during normal operation. It is designed to switch.

A relief line 62 leading to the tank 51 is branched and connected in the middle of the pressure feed line 52 between the pump 57 and the check valve 58, and the pressure of the working fluid in the pressure feed line 52 is applied in the middle of the relief line 62. A relief valve 63 that opens when the pressure exceeds the set pressure and returns the working fluid to the tank 51 is provided.

In the middle of the accumulator line 60, the high pressure switch 64H that operates when the pressure of the working fluid in the accumulator line 60 reaches the high set pressure and the pressure of the working fluid in the accumulator line 60 reach the low set pressure. A low pressure switch 64L that operates at the time and a shutoff valve 64V that is always open (normally open) and closes when the high pressure switch 64H is operated are provided. As a result, when the pressure of the working fluid in the accumulator line 60 reaches the set pressure of the accumulator 61, the high pressure switch 64H is activated to stop the motor 56 of the pump 57 from a control device (not shown). While the shutoff valve 64V is closed when a command is output, when the pressure drops below the set pressure of the accumulator 61, the low pressure switch 64L is activated to control the motor 56 of the pump 57. A drive command is output from the device and the shut-off valve 64V is opened.

A drain line 65 for draining the working fluid of the accumulator 61 to the tank 51 is connected in the middle of the accumulator line 60, and a manual on-off valve opened and closed by an operator is connected to the drain line 65. 66 is provided.

In the rail clamp mechanism 20 shown in FIGS. 1 to 3, the fluid pressure cylinder 22 is extended as shown by the solid arrow in FIG. 3, and the upper end portion (base end portion) of the clamp arm 21 is widened from each other. By pushing the rail 4, both side surfaces of the rail 4 are sandwiched by the shoes 25 at the lower end (tip) of the clamp arm 21. On the other hand, the fluid pressure cylinder 22 is contracted as shown by the arrow of the virtual line in FIG. 3, and the base end portions of the clamp arm 21 are contracted so as to narrow the distance between the clamp arms 21 so that the clamps on both side surfaces of the rail 4 are clamped. The clamp by the arm 21 is released.

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

As shown in FIG. 3, when the solenoid valve 59 of the fluid pressure unit 50 is switched to the brake operating position 59A, the hydraulic fluid fed by the pump 57 is pumped by the communication between the pumping line 52 and the cap side line 53. While being introduced into the cap side chamber 22a of the fluid pressure cylinder 22, the rod side line 54 and the return line 55 communicate with each other, so that the working fluid of the rod side chamber 22b of the fluid pressure cylinder 22 is discharged to the tank 51. As a result, the fluid pressure cylinder 22 is extended and driven, and the base end portions of the clamp arm 21 are expanded so as to widen the distance between them, so that the shoe 25 at the tip end portion of the clamp arm 21 is close to each other. Braking is performed so that both side surfaces are pressure-welded and both side surfaces of the rail 4 are sandwiched by the shoes 25.

On the other hand, when the solenoid valve 59 of the fluid pressure unit 50 is switched to the brake release position 59B from the state shown in FIG. 3, the hydraulic fluid fed by the pump 57 is pumped by the communication between the pumping line 52 and the rod side line 54. The working fluid of the cap side chamber 22a of the fluid pressure cylinder 22 is discharged to the tank 51 by communicating the cap side line 53 and the return line 55 while being introduced into the rod side chamber 22b of the fluid pressure cylinder 22. As a result, the fluid pressure cylinder 22 is contracted and driven, and the base end portions of the clamp arm 21 are contracted so as to narrow the distance between them, so that the shoe 25 is separated from both side surfaces of the rail 4 and the rail 4 The clamp arms 21 on both sides of the container are released from the clamps, and the braking is released, so that the container crane 1 can be driven.

Further, when the pressure of the working fluid in the accumulator line 60 reaches the high set pressure of the accumulator 61, the high pressure switch 64H is activated, and the motor 56 of the pump 57 is operated from a control device (not shown). A stop command is output and the shutoff valve 64V closes. On the other hand, when the pressure drops below the low set pressure of the accumulator 61, the low pressure switch 64L is activated, a drive command is output from the control device to the motor 56 of the pump 57, and the shut is shut. The off valve 64V opens. As a result, the accumulator 61 is constantly stored in a pressure between the high set pressure and the low set pressure. Moreover, the solenoid valve 59 is adapted to mechanically switch to the brake operating position 59A by a spring force by stopping the energization of the solenoid during an emergency stop or a power failure. Further, the shut-off valve 64V is always open (normally open) and is open at the time of emergency stop and power failure. Therefore, in the event of an emergency stop or a power failure, the working fluid accumulated in the accumulator 61 is guided from the accumulator line 60 to the cap side chamber 22a of the fluid pressure cylinder 22 via the cap side line 53, and the fluid pressure cylinder 22 is extended and driven. Then, the base end portions of the clamp arm 21 are expanded so as to widen the distance between them, so that both side surfaces of the rail 4 are sandwiched by the shoes 25 at the tip end portion of the clamp arm 21. As a result, even if the pump 57 stops during an emergency stop or a power failure, the brake can be operated.

As a result, in the case of this embodiment, although the method of sandwiching the rail 4 from both sides is adopted, the accuracy of the side surface of the rail 4 is low, and the dimension from the center line to the side surface in the width direction varies from side to side. Even if the rail 4 is deformed due to wear or corrosion, unlike the rail clamp device that utilizes the urging force of the compression spring as disclosed in Patent Documents 1 and 2. Since the pinching by the shoe 25 is uniformly performed by the extension drive of the fluid pressure cylinder 22, the tightening force does not significantly decrease, and a sufficient holding force can be obtained.

Further, since the shoe 25 is uniformly pinched by the extension drive of the fluid pressure cylinder 22, uneven wear of the side surface of the rail 4 and the shoe 25 is less likely to occur, and the life of the rail clamp mechanism 20 can be extended. It will be possible.

In this way, a stable holding force can be obtained, uneven wear of the contact surface can be suppressed, and the life can be extended, and both side surfaces of the rail 4 can be reliably sandwiched even during an emergency stop when the power is cut off or during a power failure. ..

FIG. 4 shows a modified example in which the tension spring 70 is provided in the embodiment of the rail clamp device of the track traveling machine of the present invention, and in the drawings, the portions having the same reference numerals as those in FIGS. 1 to 3 are shown. It represents the same thing.

In the case of the modified example shown in FIG. 4, a tension spring 70 is provided so as to hang between the base ends of the clamp arm 21, and the tension spring 70 is configured to urge the clamp arm 21 in the opening direction. .. The rod side line 54 connected to the rod side chamber 22b of the fluid pressure cylinder 22 is directly connected to the return line 55 without passing through the solenoid valve 59 in the fluid pressure unit 50, and is communicated with the tank 51.

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

As shown in FIG. 4, when the solenoid valve 59 of the fluid pressure unit 50 is switched to the brake operating position 59A, the hydraulic fluid fed by the pump 57 is pumped by the communication between the pumping line 52 and the cap side line 53. It is introduced into the cap side chamber 22a of the fluid pressure cylinder 22. Since the rod side line 54 is directly connected to the return line 55, the working fluid in the rod side chamber 22b of the fluid pressure cylinder 22 is discharged to the tank 51. As a result, the fluid pressure cylinder 22 is extended and driven against the urging force of the tension spring 70, and the base end portion of the clamp arm 21 is expanded so as to widen the distance between the clamp arm 21 and the tip end portion of the clamp arm 21. The shoes 25 are pressed against both side surfaces of the rail 4 so as to be close to each other, and both side surfaces of the rail 4 are sandwiched by the shoes 25 to perform braking.

On the other hand, when the solenoid valve 59 of the fluid pressure unit 50 is switched to the brake release position 59B from the state shown in FIG. 4, the fluid pressure cylinder 22 is contracted by the urging force of the tension spring 70, and the base end portion of the clamp arm 21. However, when the shoe 25 is contracted so as to narrow the distance between the two, the shoe 25 is separated from both side surfaces of the rail 4, and the clamp arms 21 on both side surfaces of the rail 4 are released to release the braking. Then, the container crane 1 can be driven. Incidentally, since the rod side line 54 is held in a state of being communicated with the return line 55, the working fluid of the tank 51 is the fluid pressure cylinder in conjunction with the contraction of the fluid pressure cylinder 22 due to the urging force of the tension spring 70. While being sucked up by the rod side chamber 22b of 22, the cap side line 53 and the return line 55 communicate with each other via the solenoid valve 59 switched to the brake release position 59B, so that the cap side chamber 22a of the fluid pressure cylinder 22 operates. The fluid is discharged into the tank 51.

Further, when the pressure of the working fluid in the accumulator line 60 reaches the high set pressure of the accumulator 61, the high pressure switch 64H is activated, and the motor 56 of the pump 57 is operated from a control device (not shown). A stop command is output and the shutoff valve 64V closes. On the other hand, when the pressure drops below the low set pressure of the accumulator 61, the low pressure switch 64L is activated, a drive command is output from the control device to the motor 56 of the pump 57, and the shut is shut. The off valve 64V opens. As a result, the accumulator 61 is constantly stored in a pressure between the high set pressure and the low set pressure. Moreover, the solenoid valve 59 is adapted to mechanically switch to the brake operating position 59A by a spring force by stopping the energization of the solenoid during an emergency stop or a power failure. Further, the shut-off valve 64V is always open (normally open) and is open at the time of emergency stop and power failure. Therefore, in the event of an emergency stop or a power failure, the working fluid accumulated in the accumulator 61 is guided from the accumulator line 60 to the cap side chamber 22a of the fluid pressure cylinder 22 via the cap side line 53, and the fluid pressure cylinder 22 is pulled by a tension spring. It is extended and driven against the urging force of 70, and the base end portions of the clamp arm 21 are expanded so as to widen the distance between them, so that both side surfaces of the rail 4 are formed by the shoes 25 at the tip end portion of the clamp arm 21. Be pinched. As a result, even if the pump 57 stops during an emergency stop or a power failure, the brake can be operated.

As a result, in the case of the modified example shown in FIG. 4, the rail 4 is sandwiched from both sides as in the case of FIG. 3, but the accuracy of the side surface of the rail 4 is low and the center in the width direction thereof. Even if the dimensions from the wire to the side surface vary from side to side, or the cross section is deformed due to wear or corrosion of the rail 4, the compression spring as disclosed in Patent Documents 1 and 2. Unlike the rail clamp device that uses the urging force, the shoe 25 is uniformly pinched by the extension drive of the fluid pressure cylinder 22, so that the tightening force does not drop significantly and sufficient holding is performed. Power is gained.

Further, since the shoe 25 is uniformly pinched by the extension drive of the fluid pressure cylinder 22, uneven wear of the side surface of the rail 4 and the shoe 25 is less likely to occur, and the life of the rail clamp mechanism 20 can be extended. It will be possible.

In this way, even in the modified example shown in FIG. 4, a stable holding force can be obtained, uneven wear of the contact surface can be suppressed, and the life can be extended. Can securely pinch both sides of the.

Moreover, in the modified example shown in FIG. 4, since the urging force of the tension spring 70 is used to release the clamp arm 21 from sandwiching both side surfaces of the rail 4, the fluid pressure cylinder 22 malfunctions when the container crane 1 travels. It is possible to prevent the clamp arm 21 from sandwiching both side surfaces of the rail 4, and the container crane 1 can be stably traveled.

The rail clamp device of the track-traveling machine of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

1 Container crane (orbital traveling machine)
4 Rail 7 Traveling wheel 8 Traveling device 21 Clamp arm 22 Fluid pressure cylinder 22a Cap side chamber 22b Rod side chamber 25 Shoe 50 Fluid pressure unit 51 Tank 57 Pump 59 Solenoid valve 59A Brake operating position 59B Brake release position 61 Accumulator 70 Tension spring

Claims (2)

In a rail clamp device of a track-traveling machine equipped with a traveling device in which traveling wheels that can roll along the rail are arranged.
A clamp arm provided with a shoe at the tip and capable of sandwiching and opening both side surfaces of the rail with the shoe.
It is stretchably arranged between the base ends of the clamp arms, and the tips of the clamp arms are brought close to each other during extension to bring the shoes into pressure contact with both side surfaces of the rail, while the tips of the clamp arms are contracted. A fluid pressure cylinder that separates the shoes from each other to open the shoe from both sides of the rail.
During normal operation, the hydraulic fluid is introduced into the fluid pressure cylinder to expand and contract the fluid pressure cylinder while accumulating pressure, while at the time of emergency stop when the power is cut off and during a power failure, the accumulated working fluid is guided to the fluid pressure cylinder. Equipped with a fluid pressure unit that extends the fluid pressure cylinder ,
The fluid pressure unit is
A pump that pumps the working fluid in the tank,
An accumulator for accumulating the working fluid pumped by the pump,
The brake operating position for introducing the working fluid pumped by the pump into the cap side chamber of the fluid pressure cylinder and discharging the working fluid in the rod side chamber of the fluid pressure cylinder to the tank, and the working fluid pumped by the pump are described. It has a brake release position that discharges the working fluid in the cap side chamber of the fluid pressure cylinder to the tank while introducing it into the rod side chamber of the fluid pressure cylinder, and switches to the brake operation position at the time of emergency stop when the power is cut off and in the event of a power failure. With a solenoid valve
While introducing the working fluid that is constantly open and pumped by the pump into the accumulator, it closes when the pressure of the working fluid in the accumulator reaches a high set pressure and is closed and the power is cut off. With a shut-off valve that guides the accumulated working fluid to the cap side chamber of the fluid pressure cylinder via the solenoid valve that has switched to the brake operating position and extends the fluid pressure cylinder.
A rail clamp device for orbital traveling machines, which is characterized by being equipped with. In a rail clamp device of a track-traveling machine equipped with a traveling device in which traveling wheels that can roll along the rail are arranged.
A clamp arm provided with a shoe at the tip and capable of sandwiching and opening both side surfaces of the rail with the shoe.
It is stretchably arranged between the base ends of the clamp arms, and the tips of the clamp arms are brought close to each other during extension to bring the shoes into pressure contact with both side surfaces of the rail, while the tips of the clamp arms are contracted. A fluid pressure cylinder that separates the shoes from each other to open the shoe from both sides of the rail.
During normal operation, the hydraulic fluid is introduced into the fluid pressure cylinder to expand and contract the fluid pressure cylinder while accumulating pressure, while at the time of emergency stop when the power is cut off and during a power failure, the accumulated working fluid is guided to the fluid pressure cylinder. a fluid pressure unit to extend the hydraulic cylinder,
A tension spring for urging the clamp arm in the opening direction is provided.
The fluid pressure unit is
A pump that pumps the working fluid in the tank,
An accumulator for accumulating the working fluid pumped by the pump,
The brake operating position for introducing the working fluid pumped by the pump into the cap side chamber of the fluid pressure cylinder while the rod side chamber of the fluid pressure cylinder is communicated with the tank, and the rod side chamber of the fluid pressure cylinder communicate with the tank. A solenoid valve that has a brake release position that discharges the working fluid in the cap side chamber of the fluid pressure cylinder to the tank in this state, and switches to the brake operating position in the event of an emergency stop or power failure when the power supply is cut off.
While introducing the working fluid that is constantly open and pumped by the pump into the accumulator, it closes when the pressure of the working fluid in the accumulator reaches a high set pressure and is closed and the power is cut off. A shut-off valve that guides the accumulated working fluid to the cap side chamber of the fluid pressure cylinder via the solenoid valve that has switched to the brake operating position and extends the fluid pressure cylinder against the urging force of the tension spring.
A rail clamp device for orbital traveling machines, which is characterized by being equipped with.

Images