JP2002226180A - Hydraulic hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic hoist at low cost to be maintained easily and allowing a drum to be smoothly rotated at a constant speed when the electricity is cut off. SOLUTION: The hydraulic hoist comprises a rotatably supported drum 11 and hydraulic cylinders 13 disposed on both right and left sides of the drum 11, and drive rods 67 of the hydraulic cylinders 13 are attached on both sides of the drum 11 respectively. The attaching positions of the drive rods 67 are shifted from each other at 45-180 deg. in the center angle along the circumferential direction on the side surface of the drum. In addition, switching devices 29 and 30 for changing the flow rate and flow direction of the hydraulic oil are disposed on the hydraulic cylinders 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic hoist that is rotated by a hydraulic pump and a hydraulic cylinder, and more particularly to a hydraulic hoist that lifts and opens a water gate used for a dam or a river.

[0002]

2. Description of the Related Art Conventionally, a hydraulic motor is directly connected to the side of a drum, and the rotational torque of the hydraulic motor is directly transmitted to the drum to rotate the drum. This hydraulic motor has the advantage that the rotating torque is very large and the installation space is small. However, for example, hydraulic motors used for rivers and dams are very large and expensive, so it is difficult to prepare spare motors in case of failure or to procure maintenance parts etc. Met.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, is a low-cost, easy-to-maintenance work, and a hydraulic hoist that can smoothly rotate the drum at a constant speed even during a power failure. The purpose is to provide.

[0004]

In order to achieve the above object, a hydraulic hoist according to the present invention comprises a rotatably supported drum and hydraulic cylinders disposed on both left and right sides of the drum. A hydraulic hoisting device in which drive rods of these hydraulic cylinders are mounted on both sides of the drum, wherein the mounting positions of the drive rods are shifted from each other along the circumferential direction of the side surface of the drum. Have been placed.

The use of the hydraulic hoisting device is not particularly limited, and can be widely applied to a device for winding a wire rope or the like. As the hydraulic cylinder, either a double rod type in which a telescopic drive rod protrudes from both sides or a single rod type in which an extendable drive rod protrudes from only one side can be used. further,
The number of hydraulic cylinders provided on both sides of the drum may be one or more.

According to the hydraulic hoist, when the drive rod of the hydraulic cylinder disposed on one side of the drum is fully extended, the drive rod of the hydraulic cylinder disposed on the opposite side is still fully extended. Therefore, the hydraulic cylinders complement each other, and the drum can be rotated at a constant speed. In one aspect of the hydraulic hoist according to the present invention, one hydraulic cylinder is provided on each side of the drum. As described above, since the hydraulic cylinders complement each other, if one hydraulic cylinder is disposed on each side of the drum, the rotation of the drum can be performed smoothly. Therefore, as compared with the case where a plurality of hydraulic cylinders are provided, the space is small and the cost is low.

Further, in another aspect of the hydraulic hoist according to the present invention, the amount of displacement of the mounting position of the drive rod is 45 to 180 ° at the center angle of the side surface of the drum. The center angle difference (phase difference) can be appropriately set within a range of 45 to 180 ° so that the peripheral speed of the drum is constant, and among them, 90 ° is most preferable. And in still another aspect of the hydraulic hoist according to the present invention,
The hydraulic cylinder is provided with a switching device capable of changing the flow rate and the flow direction of the hydraulic oil. Since not only the flow direction but also the flow rate of the hydraulic oil fed into the hydraulic cylinder can be changed, the rotation of the drum can be smoothly performed at a substantially constant speed. Also, by disposing two switching devices for one hydraulic cylinder and providing an appropriate phase difference between these two switching devices, the total amount of hydraulic oil supplied to the hydraulic cylinder can be kept constant. Therefore, the expansion and contraction of the drive rod of the hydraulic cylinder can be performed smoothly.

In another aspect of the hydraulic hoist according to the present invention, a double rod type hydraulic cylinder is used as the hydraulic cylinder. In this double rod type hydraulic cylinder, the drive rods extend to the left and right sides of the piston, so that the pressure receiving areas on the left and right sides of the piston are the same, and the flow rate of hydraulic oil supplied to the hydraulic cylinder is reduced on both sides of the piston. And the switching device becomes unnecessary.

In another aspect of the hydraulic hoisting device according to the present invention, a single rod type hydraulic cylinder is used as the hydraulic cylinder, and the tip of a rod of the switching device rotates in synchronization with the drum. The cam slides. The rotation of the cam causes the rod of the switching device to expand and contract, so that the flow rate of the hydraulic oil supplied into the hydraulic cylinder can be controlled mechanically with high accuracy.

[0010]

Next, a hydraulic hoist according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, a winch for lifting a floodgate will be specifically described, but the present invention is not limited to this, and can be applied to a wide variety of hoisting and winding devices.

FIG. 1 is a perspective view, partially in section, showing a sluice 1 for blocking the flow of a river and an opening and closing device 3 for opening and closing the sluice 1. A hydraulic hoisting device 5 according to an embodiment of the present invention is shown in FIG. Constitutes a part of the switchgear 3. A wire rope 7 is attached to the end of the sluice 1, and the wire rope 7 is connected to a hydraulic hoisting device 5 provided in an operation room 9, and the hydraulic hoisting device 5 is operated. Wire rope 7
, The sluice gate 1 can be opened and closed up and down.

As shown in FIG. 2, the hydraulic hoisting device 5 includes a rotatably supported substantially cylindrical drum 11 and hydraulic cylinders 13 disposed one on each side of the drum 11. , 13, and when the drum 11 rotates, the wire rope 7 attached to the sluice 1 is wound up and the sluice 1 rises as described above. Further, the drive rods 67, 67 of the hydraulic cylinders 13, 13 shown in FIG. 2 are attached to a shaft 17 provided at a position where the center angle thereof is 90 ° in the circumferential direction of the drum side surface, Further, it is swingably supported at its central portion 15.

As shown in FIG. 3, an endless chain 21 connects the center shaft 23 of the drum 11 and the rotation shaft 27 of the cam 25 to the hydraulic hoisting device 5. Since the rotating shaft 27 has the same diameter, the drum 11
The rotation of the cam 25 is also performed in synchronization with the rotation of the cam 25. further,
Two variable flow rate switching devices 29 and 30 are provided for one hydraulic cylinder 13.
The distal ends 33 of the rods 9 and 30 are configured to reciprocate left and right while sliding on the outer peripheral surface 35 of the cam 25. Since the cams 25 are arranged to rotate with a constant phase difference from each other, the rods 31 of the switching devices 29 and 30 also reciprocate left and right according to the phase difference of the cams 25. It is preferable that the phase difference and the shape of the cams 25, 25 are set so that the total flow rate of the hydraulic oil flowing into the two switching devices 29, 29 is as constant as possible. The drum 11 is provided with a braking device 37 for stopping its rotation.

A hydraulic unit 41 and a reserve power 43 are connected to the switching device 29. The hydraulic unit 41 includes a hydraulic pump 45 and a motor 47 for operating the hydraulic pump 45.
Is mainly composed of a pump 49 that can be driven by a gasoline engine at the time of a power failure or the like. Next, a hydraulic circuit of the hydraulic hoisting device 5 will be described with reference to FIG. As described above, one hydraulic cylinder 13 is mounted on one side of the drum 11, and two switching devices 29 and 30 are connected to the one hydraulic cylinder 13.

First, the hydraulic oil 6 contained in the tank 61
3 is branched by the hydraulic pump 45 and then branched.
It is fed into two switching devices 29, 30 through 5, 65. The hydraulic oil 63 is fed into the hydraulic cylinder 13 after passing through these switching devices 29, 30, whereby the drive rod 67 is extended. Hydraulic cylinder 1
The hydraulic oil 63 discharged from the tank 3 is sent to the switching devices 29 and 30 through the pipe 65, and then flows into the tank 61.

The rods 31, 31 of the two switching devices 29, 30 are connected to cams 25, 25 which rotate with a phase difference.
When the phase difference is, for example, 90 °, when one of the rods 31 is most contracted, the other rod 31 is most extended. That is, as shown in FIG. 5, when the elliptical cam 25 is in a horizontally long state, the switching device 29
Rod 31 is pushed in and contracted most, and at the same time, the spool valve 69 fixed to this rod 31 is pushed in the farthest side. In this state, the hydraulic oil 63 flows in from the hydraulic pump 45 and is discharged from the A port, while B
The hydraulic oil 63 flowing from the port is discharged from the tank port.

Also, as shown in FIG.
Is rotated clockwise by about 45 ° from the state, the hydraulic oil 63 flows in from the hydraulic pump side and is discharged from the A port, while the hydraulic oil 63 flowing from the B port is discharged from the tank port. However, since the spool valve 69 inside the switching device 29 is moving to the right in FIG. 6, the flow rate of the hydraulic oil 63 sent to the A port and the flow rate discharged from the B port are reduced more than those in FIG. It is getting less. However, also in the other switching device 30, the flow rate of the hydraulic oil 63 sent to the A port and the flow rate sent from the B port are reduced, so that the total amount of the operating oil 63 flowing into the hydraulic cylinder 13 from the two switching devices 29, 30. Is almost constant.

As shown in FIG. 7, when the cam 25 rotates clockwise by about 90 ° from the state shown in FIG. 5, the spool valve 69 inside the switching device 29 moves to the rightmost position. The hydraulic oil 63 flows in and is discharged from the B port, while the hydraulic oil 63 flows in from the A port is discharged from the tank port. Also in this case, the other switching device 30 is in the state shown in FIG.
The total amount of the hydraulic oil 63 flowing into the tank becomes substantially constant. Also,
Until now, the single rod type hydraulic cylinder 13 in which the rod 31 protrudes only to one side has been described, but as shown in FIG. 73 may be used. In this double rod type hydraulic cylinder 73, on the left and right sides inside the cylinder 73, the vertical wall surface 7 of the piston portion 75 to which the rod 71 is attached is attached.
7 and 77 (see FIG. 8 (b)) are both ring-shaped and have the same area. Therefore, the flow rate of the hydraulic oil 73 flowing into the right side inside the hydraulic cylinder 73 in FIG. The discharged flow rate is almost the same. Therefore, in the case of using the double rod type hydraulic cylinder 73, the rotational speed of the drum 11 becomes constant without controlling the flow rate of the hydraulic oil 63, so that there is no need to dispose the cam 25.

Note that the graphs of FIGS.
One-sided hydraulic cylinders 13, 13 on both sides of 1
Shows the simulation results in the case where one is attached by shifting each 90 ° on the left and right sides. As shown in FIGS. 9 and 10, according to the hydraulic hoisting device 5 according to the embodiment of the present invention, the rotation angle of the drum 11 can be rotated at a substantially constant speed in proportion to time. Further, as shown in FIG. 11, the pressure receiving area of the hydraulic cylinder 13 changes in accordance with the phase difference between the mounting positions of the hydraulic cylinders 13, 13.

Further, as shown in FIGS. 12 and 13, the tangential component and the radial component of the cylinders 13 and 13 also change with a phase difference from each other. In particular, the tangential component is When both are combined, it is always constant. As shown in FIGS. 14 and 15, the stroke displacement and the cylinder speed of the cylinder 13 also change in a sine curve with a phase difference therebetween, and the hydraulic oil flowing into the hydraulic cylinder 13 as shown in FIG. The supply flow rate of 63 has remained almost constant, although the total amount is slightly changed.

[0021]

The hydraulic hoist according to the present invention is inexpensive, easy to perform maintenance work, and can mechanically rotate the drum mechanically and smoothly at a constant speed even during a power failure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a partial cross section showing a water gate provided with a hydraulic hoisting device according to an embodiment of the present invention and a switchgear thereof.

FIG. 2 is a perspective view showing a drum and a hydraulic cylinder of the hydraulic hoist according to the embodiment of the present invention.

FIG. 3 is a schematic diagram showing the entire hydraulic hoist according to the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a hydraulic circuit of the hydraulic hoist according to the embodiment of the present invention.

FIG. 5 is a schematic diagram showing a switching device and a cam used in the hydraulic hoist according to the embodiment of the present invention.

FIG. 6 is a schematic diagram showing the switching device and the cam when the cam rotates about 45 ° from the state of FIG. 5;

FIG. 7 is a schematic view showing the switching device and the cam when the cam rotates about 90 ° from the state of FIG. 5;

8A is a schematic view showing the internal structure of a double rod type hydraulic cylinder, and FIG. 8B is a sectional view taken along line AA in FIG. 8A.

FIG. 9 is a graph showing a relationship between a rotation angle of a drum and time in the hydraulic hoist according to the embodiment of the present invention.

FIG. 10 is a graph showing a relationship between a rotation speed of a drum and time of the hydraulic hoist according to the embodiment of the present invention.

FIG. 11 is a graph showing a relationship between a pressure receiving area of a cylinder and time in the hydraulic hoist according to the embodiment of the present invention.

FIG. 12 is a graph showing a relationship between a component force in a tangential direction of a cylinder of the hydraulic hoist according to the embodiment of the present invention and time.

FIG. 13 is a graph showing a relationship between a component force in a radial direction of a cylinder and time in the hydraulic hoist according to the embodiment of the present invention.

FIG. 14 is a graph showing a relationship between stroke displacement of a cylinder and time of the hydraulic hoist according to the embodiment of the present invention.

FIG. 15 is a graph showing the relationship between the expansion / contraction speed of a cylinder and time of the hydraulic hoist according to the embodiment of the present invention.

FIG. 16 is a graph showing a relationship between a flow rate of hydraulic oil supplied to a cylinder of the hydraulic hoist according to the embodiment of the present invention and time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sluice gate 3 Opening / closing device 5 Hydraulic hoisting device 7 Wire rope 9 Operation room 11 Drum 13, 73 Hydraulic cylinder 15 Central part 17 Shaft part 21 Endless chain 23 Central axis 25 Cam 27 Rotation axis 29, 30 Switching device 31 Rod 33 Tip 35 Outer peripheral surface 37 Control device 41 Hydraulic unit 43 Preliminary power 45 Hydraulic pump 47 Motor 49 Pump 61 Tank 63 Hydraulic oil 65 Piping 67 Drive rod 69 Spool valve 71 Rod 75 Piston part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Fumiaki Yanagita 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Works F-term (reference) 2D019 AA59 AA60

Claims (6)

[Claims] 1. A hydraulic apparatus comprising: a rotatably supported drum; and hydraulic cylinders disposed on both left and right sides of the drum, and a drive rod of each of these hydraulic cylinders mounted on both sides of the drum. A hydraulic hoist, wherein the mounting positions of the drive rods are shifted from each other along a circumferential direction of a side surface of the drum. 2. The hydraulic hoist according to claim 1, wherein one hydraulic cylinder is disposed on each side of the drum. 3. A displacement amount of a mounting position of the driving rod,
The hydraulic hoist according to claim 1, wherein the central angle of the side surface of the drum is 45 to 180 °. 4. The hydraulic hoist according to claim 1, wherein the hydraulic cylinder is provided with a switching device capable of changing a flow rate and a flow direction of hydraulic oil. 5. The hydraulic hoist according to claim 1, wherein a double rod type hydraulic cylinder is used as the hydraulic cylinder. 6. The hydraulic cylinder according to claim 4, wherein a single rod type hydraulic cylinder is used, and a tip of a rod of the switching device is brought into sliding contact with a cam rotating in synchronization with the drum. Hydraulic hoist.