JP6709107B2 - Hydraulic cylinder locking mechanism and continuous unloader using the same - Google Patents

Description

The present invention relates to a lock mechanism of a hydraulic cylinder used for a continuous unloader for unloading iron ore, coal, etc. in a hold, and in particular, a hydraulic cylinder for fixing the boom at the same angle when the continuous unloader is stopped. And a continuous unloader using the same.

In the continuous unloader, a bucket elevator is installed at the tip of a boom that can be raised and lowered.The scraping section at the bottom of the bucket elevator scrapes the cargo in the hold and stores it in the bucket. Then, the cargo is unloaded.

A hydraulic cylinder is provided on the elevation of the boom, and the boom is elevated by expanding and contracting the hydraulic cylinder.

When the continuous unloader is stopped, it is necessary to lock the hydraulic cylinder to prevent the boom from moving.

In order to fix the rod of the hydraulic cylinder under load so that it does not move in a fixed position, the hydraulic circuit of oil is shut off by a motorized valve, a solenoid valve, a manual valve, etc. so that oil does not come in and out.

The rod of the hydraulic cylinder can be fixed in place by supporting the structure itself under load on the hydraulic cylinder and eliminating the load acting on the hydraulic cylinder, in addition to interrupting the oil circuit. ..

Japanese Patent No. 3590662 Japanese Utility Model Publication No. 05-2660 JP, 10-26104, A

However, fixing the oil circuit by breaking it may cause a leak in the motor-operated valve, the solenoid valve, and the manual valve, and there is a possibility that the oil may move from a fixed position.

When supporting the structure itself, the load supported by the cylinder is large, and if a substitute is used to support the structure, an additional huge device is required, which hinders the main structure.

Therefore, an object of the present invention is to solve the above problems and provide a hydraulic cylinder lock mechanism that can lock the hydraulic cylinder without relying on the hydraulic pressure and a continuous unloader using the lock mechanism.

In order to achieve the above object, the present invention provides a lock mechanism of a hydraulic cylinder for locking a rod of a hydraulic cylinder on which a load is applied in its extended position, the cylinder being connected to the tip of the rod and being a cylinder of the hydraulic cylinder. A lock arm that extends to the side and has a large number of pin holes, an eye plate that is provided at the tip of the cylinder and that has a pin hole, and a lock that matches the pin hole of the eye plate at the extended position of the rod. A lock mechanism for a hydraulic cylinder, which is provided with a lock pin that is inserted into a pin hole of an arm to fix the lock arm, and a continuous unloader using the lock mechanism.

The present invention provides a rod and a cylinder of a hydraulic cylinder that lifts a boom of a continuous unloader, etc., with a lock arm having a pin hole and an eye plate, and by connecting these with a lock pin, any expansion/contraction position of the hydraulic cylinder can be achieved. It has an excellent effect that it can be fixed with.

1 is an overall view of a continuous unloader to which a lock mechanism for a hydraulic cylinder of the present invention is applied. 1 is a front view, (b) is a side view of (a), and (c) is an AA line enlarged cross-sectional view of (a).

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, the continuous unloader 10 will be described with reference to FIG.

As shown in FIG. 1, the continuous unloader 10 includes a portal portion 13 that travels on a rail 12 provided on a quay 11 such as a wharf, a swing frame 14 that is horizontally swingable on the portal portion 13, and a swing frame. 14, a balancing lever 15 that is provided so as to be lifted up and down, a bucket elevator casing 17 that is provided on the balancing lever 15 so as to be rotatable via a top frame 16, and that is used for cargo handling; And a boom 18 that forms a parallel link with these and the balancing lever 15.

The balancing lever 15 also extends to the rear of the revolving frame 14, and a counterweight 19 is provided at the rear end of the balancing lever 15. The balancing lever 15 and the swing frame 14 are connected by a hydraulic cylinder 20 for elevation, and the balancing lever 15 and the boom 18 are elevated by extending and contracting the hydraulic cylinder 20.

The bucket elevator casing 17 also serves as a casing for the bucket elevator 23 in which a large number of buckets 21 are connected by a chain 22. The chain 22 of the bucket elevator 23 is wound around a drive sprocket 24 provided in an upper portion inside the bucket elevator casing 17, and a front sprocket 26a and a rear sprocket 26b that form a scraping portion 25 below the bucket elevator casing 17. Has been.

For the unloading by the continuous unloader 10, a hull 30 such as a cargo ship is docked on the quay 11, a hatch 32 on a hold 31 of the hull 30 is opened, the bucket elevator casing 17 is put into the hold 31, and the scraping section is used. 25 is moved to a predetermined position in the hold 31 and positioned on the load 33, and in this state, the bucket elevator 23 is driven to scrape the load 33.

The load 33 scraped by each bucket 21 of the scraping unit 25 passes through the bucket elevator casing 17, and is conveyed from the conveyor 28 provided in the boom 18 via a chute (not shown) in the revolving frame 14 to the portal. The transfer device 34 provided in the part 13 is carried out to the landing conveyor 35 provided in the quay 11, and is conveyed from the landing conveyor 35 to the storage facility.

During the unloading of the continuous unloader 10, the scraping unit 25 is lowered to scrape the load 33 in the hold 31, and after the unloading is completed, the scraping unit 25 is lifted to move away from the hold 31, so that the hydraulic cylinder 20 and the balancing lever are moved. The boom 18 is lifted and lowered via 15.

The raising and lowering of the boom 18 is performed by controlling the supply and discharge of oil in the hydraulic cylinder 20 with a hydraulic circuit (not shown) connected to the hydraulic cylinder 20.

Conventionally, when the operation of the continuous unloader 10 is stopped, the boom 18 is rotated upward, and at that position, an electric valve, a solenoid valve, a manual valve, etc. provided in the hydraulic circuit prevent oil from entering and leaving the hydraulic cylinder. Shut off the hydraulic circuit. However, a load of several hundreds of tons due to the balancing lever 15, the bucket elevator casing 17, and the boom 18 is applied to the hydraulic cylinder 20 that lifts the balancing lever 15, and a high hydraulic pressure acts to support the load. .. Therefore, when an oil leak occurs in the hydraulic circuit, there is a problem that the hydraulic cylinder 20 cannot be locked by the hydraulic pressure, and the motor-operated valve or the like maintains the high hydraulic pressure applied to the hydraulic cylinder 20 even when the continuous unloader 10 is stopped. Therefore, its durability is also likely to deteriorate.

Therefore, the present invention is designed so that the rod of the hydraulic cylinder of the continuous unloader can be fixed mechanically and with a small amount that does not interfere with the main body structure. 2(c).

As shown in FIGS. 2A and 2B, a pair of hydraulic cylinders 20 are provided to connect the swing frame 14 and the balancing lever 15, and the base portion of the cylinder 40 of the hydraulic cylinder 20 has a connecting pin 42. Is connected to the revolving frame 14, and the tip of the rod 41 is connected to a balancing lever 15 that raises and lowers the boom 18 by a connecting pin 43.

Oil is supplied from the hydraulic circuit to the front and rear of the pistons of the cylinders 40 of the pair of hydraulic cylinders 20, whereby the rod 41 expands and contracts, and the boom 18 is lifted up via the balancing lever 15 and the top frame 16 (see FIG. 1). It

In the present embodiment, the lock arm 45 extending along both sides of the cylinder 40 is provided at the tip of the rod 41, and the eye plate 46 is provided at the tip of the cylinder 40. The lock arm 45 is provided with a large number of pin holes 47 at intervals along the lock arm 45, the eye plate 46 is provided with a pin hole 48, and the pin hole 47 corresponding to the expansion/contraction position of the rod 41, By inserting the lock pin 50 into the rod 48, the rod 41 is locked at an arbitrary expansion/contraction position.

The lock arm 45 is screwed onto the tip of the rod 41, is integrally provided with a knuckle joint 51 that is connected to the connecting pin 43 of the balancing lever 15, and is provided on both sides of the boss portion 52. And a plurality of pin holes 47 provided along the pair of arm portions 53.

As shown in FIGS. 2A and 2C, the eye plate 46 is a fixed tube 55 attached to the tip of the cylinder 40, and a fixed tube 55 provided on both sides of the fixed tube 55 and having a pin hole 48. And a plate 56.

The lock pin 50 locks the expansion/contraction position of the rod 41 of the hydraulic cylinder 20 by inserting the lock pin 50 into the pin hole 47 of the lock arm 45 that matches the pin hole 48 of the eye plate 46. At this time, the tip portion of the lock pin 50 is tapered so that the pin holes 47 and 48 can be centered.

Next, the operation of this embodiment will be described.

The expansion and contraction of the hydraulic cylinder 20 raises and lowers the balancing lever 15. In this case, the lower limit is set when the downward tilt of the balancing lever 15 is, for example, 3.7 degrees downward with respect to the horizontal, and the upward tilt is, for example, 11.3 degrees upward with respect to the horizontal. Letting time be the upper limit value, the balancing lever 15 is elevated and the rod 41 of the hydraulic cylinder 20 expands and contracts within the range between the lower limit value and the upper limit value (elevation range 15°).

The pin holes 47 provided in the lock arm 45 are provided along the range of expansion and contraction of the rod 41 of the hydraulic cylinder 20, for example, in correspondence with the elevation angle of the balancing lever 15 at intervals of 2 to 3 degrees.

After the unloading of the continuous unloader 10 is completed, the boom 18 is rotated upward via the balancing lever 15 so that the scraping unit 25 is lifted from the hatch 32, and in that state, the boom 18 is swung by 90 degrees and the bucket elevator 23 is rotated. It is stopped along the quay 11. In this state, by inserting the lock pin 50 into the pin hole 47 of the lock arm 45 that matches the pin hole 48 of the eye plate 46, the rod 41 of the hydraulic cylinder 20 is locked, and the hydraulic pressure of the hydraulic cylinder 20 by the hydraulic circuit is locked. Can be canceled.

Positioning of the pin hole 48 of the eye plate 46 and the pin hole 47 of the lock arm 45 may be performed by causing a control device that controls the operation of the continuous unloader 10 to store the angle of the boom 18 that matches in advance, or by using a hydraulic cylinder. The cylinder 40 of 20 is provided with a pin hole detector such as a limit switch for detecting the pin hole 47 of the lock arm 45, and when the pin hole detector detects the pin hole 47, the operator is notified of this, and the operator In response to this, by stopping the expansion of the hydraulic cylinder 20, the pin holes 47, 48 can be easily positioned.

At this time, since the tip of the lock pin 50 is tapered, the lock pin 50 is centered and locked even if the positions of the pin holes 47 and 48 are slightly displaced.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the example of the hydraulic cylinder used for the continuous unloader has been described, but it is needless to say that the present invention may be applied to the hydraulic cylinder of a hydraulic crane or the hydraulic cylinder used for various unloading devices.

10 Continuous Unloader 15 Balancing Lever 18 Boom 20 Hydraulic Cylinder 40 Cylinder 41 Rod 45 Lock Arm 46 Eye Plate 47, 48 Pin Hole 50 Lock Pin

Claims (4)

In a lock mechanism of a hydraulic cylinder for locking a rod of a hydraulic cylinder under load in its extended position, the lock mechanism is connected to the tip of the rod, extends to the cylinder side of the hydraulic cylinder, and is provided with a large number of pin holes. Lock arm, an eye plate provided at the tip of the cylinder and having a pin hole, and a lock arm pin hole that matches the pin hole of the eye plate at the extended position of the rod, and locks the lock plate. With a lock pin to fix the arm ,
A lock mechanism for a hydraulic cylinder, wherein the eye plate includes a fixed cylinder attached to a tip portion of the cylinder, and fixed plates provided on both sides of the fixed cylinder and having pin holes . The lock arm includes a boss portion provided at the tip of the rod, a pair of arm portions provided on both sides of the boss portion and provided along both sides of the cylinder, and a pair of arm portions. The lock mechanism for a hydraulic cylinder according to claim 1, further comprising a plurality of pin holes provided therein. 3. The lock mechanism for a hydraulic cylinder according to claim 1, wherein a tip portion of the lock pin is tapered . A swing frame that is horizontally swingable on the portal, a balancing lever that is vertically lifted on the top of the swing frame, and a bucket that is swingably mounted on the balancing lever via the top frame for cargo handling. An elevator, a boom that connects the top frame and the swing frame and forms a parallel link with them and a balancing lever, and a hydraulic cylinder that connects the swing frame and the balancing lever and raises and lowers the boom are provided. In the continuous unloader,
A continuous unloader, wherein the hydraulic cylinder is provided with the lock mechanism for the hydraulic cylinder according to claim 1.

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