JPH082174Y2 - Cylinder for hydraulic undulating gate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hydraulic cylinder for undulating an undulating gate installed for adjusting the water level in a river.

[Prior Art] Conventionally, as disclosed in Japanese Utility Model Publication No. 60-20656, a hydraulic undulating gate is used for adjusting the water level in a river.
In this hydraulic undulating gate, the lower end of the door body is rotatably attached to the bottom of the water channel, and a plurality of hydraulic cylinders provided behind the door body undulates the door body to a predetermined inclination. The water level is being adjusted. Since the hydraulic cylinder also performs the hoisting operation when hoisting the door body, a swivel joint is used for the rotating part of the hydraulic pipe connected to the hydraulic cylinder.

[Problems to be Solved by the Invention] However, since the swivel joint of the hydraulic pipe is mounted in an exposed state, there is a possibility that soil or the like flowing from the river may enter the rotating part, and the cover is originally used. Although it should be protected by such means, the present situation is that the cover is not easily attached. Further, since the swivel joint is connected to the hydraulic cylinder by screwing, a slight turning force is applied by the undulating motion of the hydraulic cylinder, and the screwed portion may be loosened to cause oil leakage.

The present invention has been made in view of the above points, and an object thereof is to provide a hydraulic cylinder for a falling gate capable of supplying hydraulic oil without using a swivel joint by modifying the hydraulic cylinder.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a through hole formed at the piston rod tip end of a cylinder at right angles to the axial direction of the piston rod, and is formed inside the piston rod. An oil passage is formed from the end portion to the through hole, and an annular oil groove is formed in the central peripheral surface portion of the piston rod pivot shaft that is inserted into the through hole to pivotally attach the tip of the piston rod of the cylinder. Facing the oil passage, and forming a lateral hole from the annular oil groove toward the center of the piston rod pivot,
Further, an oil supply passage reaching from the one end of the piston rod pivot to the lateral hole is formed, and sealing annular grooves are formed on both side peripheral surfaces of the annular oil groove of the piston rod pivot, and O-rings are attached to the piston rod. The misalignment prevention ring was attached to the pivot.

[Operation] According to the hydraulic undulating gate cylinder according to the present invention,
The hydraulic oil that operates the hydraulic cylinder is configured to pass through the piston rod pivot shaft that pivotally attaches the tip end portion of the piston rod and the inside of the piston rod. That is, the hydraulic oil supplied from the oil supply passage of the piston rod pivot passes through the lateral hole through the oil supply passage, flows out into the annular oil groove formed in the central peripheral surface of the piston rod pivot, and further passes through the oil passage of the piston rod. It passes through and flows into the cylinder from the base end of the piston rod, and pushes out the piston rod from the cylinder to extend the piston rod. When the piston rod expands and contracts, the hydraulic cylinder rotates around the piston rod pivot with the tip end of the piston rod pivotally attached. Therefore, the flow of the hydraulic oil flows smoothly without being obstructed, enabling the piston rod to expand and contract.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a hydraulic undulation gate incorporating a hydraulic undulation gate cylinder 2 (hereinafter referred to as “hydraulic cylinder”), which includes a support frame 4 combined with channel steel and a water channel bottom wall 5
The horizontal girder member 6 made of H-shaped steel is passed between the water channel side walls 7 on both sides and fixed on the front side (upstream side) of the support frame 4, and the rear side of the horizontal girder member 6 is fixed. The lower edge of the door 9 is rotatably pivotally attached to a plurality of brackets 8 fixed at appropriate intervals (downstream side). Cylinder mounting brackets 10 are fixed to the back surface of the door body 9 at appropriate intervals along the longitudinal direction of the gate so as to face each other, and the trunnion ring 11 of the hydraulic cylinder 2 is rotatably pivoted to the cylinder mounting bracket 10. I'm wearing it.

A through hole 13 is formed at the tip of the piston rod 12 of the hydraulic cylinder 2 at a right angle to the axial direction of the piston rod 12, and a piston rod pivot shaft 14 is inserted into the through hole 13 so that both ends of the piston rod pivot shaft 14 are penetrated. The support part is supported by the support metal fitting 15 fixed to the support frame 4, and the fixing ring 16 is mounted in the annular groove formed on the peripheral surface of both ends of the piston rod pivot 14, and the bolt 17 is screwed to the fixing ring 16 and the support metal fitting 15. The piston rod pivot 14 is fixed to the support fitting 15. Further, a displacement prevention ring 18 is attached to an annular groove formed in the peripheral surface of the piston rod pivot 14 so that the piston rod 12 pivotally attached to the piston rod pivot 14 does not shift.

Inside the piston rod 12 of the hydraulic cylinder 2, an oil passage 19 which is a passage for hydraulic oil is formed from the base end portion to the vicinity of the tip end portion thereof. An annular oil groove 20 is formed on the central peripheral surface of the piston rod pivot 14 so as to face the oil passage 19. Further, a lateral hole 21 is formed from the annular oil groove 20 toward the center of the shaft,
An oil supply passage 22 is formed from the lateral hole 21 to one end of the piston rod pivot 14. The morning oil supply pipe 23 is connected to the oil supply passage 22 along the horizontal girder member 6.
Further, sealing annular grooves are formed on both side peripheral surfaces of the annular oil groove 20 of the piston rod pivot 14 and O-rings 24 are attached to prevent leakage of hydraulic oil to the outside.

Therefore, in order to raise the door body 9 of the undulating gate 1 from the laid state, the hydraulic oil supplied from the hydraulic pump (not shown) is supplied to the piston through the hydraulic oil supply pipe 23 by the control of the direction switching valve (not shown). Supply to the oil supply passage 22 of the rod axis 14. The hydraulic oil supplied to the oil supply passage 22 of the piston rod pivot 14 passes through the oil supply passage 22 and the lateral hole 21, flows out to the annular oil groove 20 formed in the central peripheral surface portion of the piston rod pivot 14, and further the piston It passes through the oil passage 19 of the rod 12 and flows into the hydraulic cylinder 2 from the base end portion of the piston rod 12, and pushes out the piston rod 12 from the hydraulic cylinder 2 to extend the piston rod 12. When the piston rod 12 is extended, the piston rod 12
Although the hydraulic cylinder 2 rotates around 14, the annular oil groove 20 formed in the central peripheral surface of the piston rod pivot 14 constantly faces the oil passage 19 of the piston rod 12, so that the flow of hydraulic oil is obstructed. It flows smoothly. When the piston rod 12 extends, the force of the door body 9 with the piston rod pivot 14 as a base point acts, and the door body 9 stands up and closes the water channel at a predetermined elevation angle.

Further, in order to incline the standing door body 9, the hydraulic cylinder 2 is controlled by switching control of a directional control valve (not shown).
If the hydraulic oil inside is made to flow out through the path opposite to that at the time of supply, the hydraulic oil is discharged to the hydraulic oil supply pipe 23 through the path opposite to that at the time of supply due to the weight of the door body 9 and water pressure, and the piston rod 12 is removed. The door body 9 can be reduced and the door 9 can be laid down to a predetermined angle.

The use of the hydraulic cylinder of the present invention is not limited to the above-mentioned undulating gate for water level adjustment of rivers,
It goes without saying that the hydraulic pressure may be changed to pneumatic pressure depending on the intended use.

[Advantage of the Invention] As described above, in the hydraulic undulating gate cylinder 2 according to the present invention, the hydraulic oil for operating the hydraulic cylinder 2 is the piston rod pivot 14 and the piston that pivotally attach the tip of the piston rod 12. Since it is configured to pass through the inside of the rod 12, a swivel joint as in the past is not required, the piping system is simplified, and the piping does not loosen, and it has excellent durability. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a cylinder for a hydraulic undulating gate according to the present invention, FIG. 2 is an enlarged view of an essential part of FIG. 1, FIG. 3 is a vertical sectional front view of a hydraulic undulating gate, and FIG. It is a rear view of FIG. DESCRIPTION OF SYMBOLS 1 ... Hydraulic undulation gate, 2 ... Hydraulic undulation gate cylinder, 9 ... Door body, 12 ... Piston rod, 13 ... Through hole, 14 ...
Piston rod pivot, 16… Fixing ring, 17… Bolt, 23
… Rings for preventing displacement, 19… Oil passages, 20… Annular oil grooves, 21
… Horizontal hole, 22… Oil supply channel, 23… Operating oil supply pipe, 24… O ring

Claims (1)

[Scope of utility model registration request] 1. A piston is provided with a through hole at a tip end portion of a piston rod of a cylinder at a right angle to an axial direction of the piston rod, and an oil passage is penetrated from the base end portion to the through hole inside the piston rod. An annular oil groove is formed in the central peripheral surface of a piston rod pivot shaft that rotatably pivotally attaches the tip of the piston rod of the cylinder by penetrating into the through hole, and faces the oil passage, and the piston rod extends from the annular oil groove. A lateral hole is formed toward the center of the pivot shaft, and an oil supply path reaching from the one end of the piston rod pivot shaft to the lateral hole is formed, and sealing annular grooves are formed on both sides of the annular oil groove of the piston rod pivot shaft. A hydraulic undulating gate cylinder characterized in that an O-ring is formed on the piston rod, and a displacement prevention ring is attached to the piston rod pivot.