JP2005053641A - Derrick type loading device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a derrick type loading device capable of performing accident prevention of the derrick type loading device more completely, and enlarging a possible area for loading work. <P>SOLUTION: This derrick type loading device includes a goose-neck 3 attached at a goose-neck body 2 of a post 1 so as to be rotated freely, a boom 4 attached at the goose neck 3 so as to be elevated freely, a hook 5 hung down from the boom 4, a turning winch SW turning the boom 4, an elevating winch TW which elevates the boom 4, a hanging winch CW lowering/raising the hook 5, a switching valve 20 intervened between the turning motor M1 and a pump P, stops supplying/discharging working fluid to/from the turning motor M1, and allows the working fluid to be supplied/discharged to/from an elevating motor M2 and a hanging motor M3, and a controller which detects that the elevating angle of the boom 4 exceeds 70° to switch the switching valve 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a derrick type cargo handling apparatus. More specifically, the present invention relates to a derrick-type cargo handling device installed on a cargo ship or other various ships, or on land, and relates to a control technology for controlling the cargo handling work range in relation to the elevation angle of the boom.

  A derrick type cargo handling device for a cargo ship includes a post erected on a deck, a gooseneck pivotally attached to a gooseneck body at the base of the post, a boom attached to the gooseneck, and a boom And a hook suspended from a pulley at the tip of the wire rope by a wire rope. Also. At the tip of the boom, wire ropes for turning and raising operations are connected, and these wire ropes are connected to a turning winch and a lifting winch, and each winch is driven by a hydraulic motor to turn and raise the boom. . The hook is also lifted and hung by a winch driven by a hydraulic motor (see Patent Document 1).

The structure of the derrick type cargo handling device will be described in detail with reference to FIGS. In FIG. 3A, reference numeral 1 denotes a post. A gooseneck body 2 is attached to the base of the post, and the gooseneck 3 is pivotally attached to the gooseneck body 2. Moreover, the base part of the boom 4 is supported by the gooseneck 3 so that it can be raised and lowered.
As shown in FIGS. 4 to 5, the turning shaft 3 a of the gooseneck 3 is inserted into the support hole 2 a of the gooseneck body 2, and the gooseneck 3 can turn freely by this turning pair. An eyepiece 3c is erected on the flange portion 3b of the gooseneck 3, and two heel pieces 4a fixed to the base of the boom 4 are located on both sides of the eyepiece 3c, and the eyepiece 3c and the heel pieces 4a, 4a are A horizontal heel piece pin 3d is passed. The boom 4 is supported by the heel piece pin 3d and can be raised and lowered.

As shown in FIG. 3, ropes 6 and 7 for turning and raising are connected to the tip of the boom 4, and the respective ends are wound around a turning winch and a raising and lowering winch. The swivel winch is an operation for winding one of the two ropes while winding the other, and when the swivel winch is rotated in both forward and reverse directions, the boom 4 can be turned clockwise or counterclockwise. The hoisting winch is a device that winds or winds two ropes together. When the ropes 6 and 7 are fed together, the boom 4 can be lowered, and when the ropes 6 are wound together, the boom 4 can be raised.
A hook 5 is suspended by a rope 8 via a pulley at the tip of the boom 4, and the end of the rope 8 is wound around a lifting winch. When the lifting winch is rotated forward and backward, the hook can be moved up and down.

  In the derrick-type cargo handling device, when the boom 4 is tilted to 35 ° or less, the overturning moment increases and the usage is restricted. If the heel piece 4a is bent, the eyepiece 3c and the heel piece 4a are damaged. Therefore, the elevation angle of the boom 4 is in a normal usable range of 35 ° to 70 °, and use is prohibited at other elevation angles, particularly 70 ° or more. This unusable range is indicated by solid line hatching in FIGS.

The prevention of entry into the unusable range is less effective if the derrick operator is careful only. Therefore, a sensor 10 is attached to detect that the elevation angle of the boom 4 has reached 70 °. And so on.
However, the accident prevention effect is still not complete, and since all crane operations are prohibited in the unusable range as shown in FIG. 4B, the cargo handling work efficiency is low. For example, there is no possibility of damaging the eyepiece 3c and the heel piece 4a, such as pulling the rope 8 and pulling the load without turning the boom 4, but this is also uniformly prohibited. .

JP-A-53-109361

  In view of the above circumstances, an object of the present invention is to provide a derrick-type cargo handling device capable of preventing damage to the derrick-type cargo handling device more completely and expanding the possible range of cargo handling work.

A derrick-type cargo handling device according to a first aspect of the present invention includes a gooseneck that is pivotably attached to a gooseneck body of a post, a boom that is pivotably attached to the gooseneck, a hook that is suspended from the boom, and a pivot that swings the boom. A hydraulic swing device that lifts the boom, a hydraulic lifting device that moves the hook up and down, and the hydraulic swing device interposed between the hydraulic swing device and a hydraulic power source. A supply / discharge control circuit that prevents supply and discharge of hydraulic oil to the apparatus and allows supply and discharge of hydraulic oil to and from the hydraulic lifting device and the hydraulic lifting device, and an elevation angle of the boom exceeds a set value And a starting means for operating the supply / discharge control circuit.
The derrick-type cargo handling device according to a second aspect of the present invention is the derrick-type cargo handling device according to the first aspect, wherein the supply / discharge control circuit includes a first supply / discharge circuit connecting the hydraulic power source and the hydraulic swing device, the hydraulic power source and the hydraulic lift. A second supply / exhaust circuit that connects between the hydraulic source, a third supply / exhaust circuit that connects between the hydraulic power source and the hydraulic lifting device, and the first supply / exhaust circuit, the second supply circuit Position for communicating with all of the discharge circuit and the third supply / discharge circuit, and supply / discharge to the first supply / discharge circuit are blocked, and supply / discharge to the second supply / discharge circuit and the third supply / discharge circuit are allowed. And a switching valve that selectively switches between positions.
The derrick-type cargo handling device according to a third aspect of the present invention is the derrick-type cargo handling device according to the second aspect, wherein the activation means receives the sensor for detecting an elevation angle of the boom of 75 ° to 80 ° and a detection signal of the switch. It is characterized by comprising a controller for performing the switching drive.

According to the first aspect of the present invention, when the boom elevation angle becomes equal to or greater than the set value, the supply / discharge control circuit is activated to stop driving the hydraulic turning device. This prevents the boom from turning and prevents damage. Since the hydraulic lifting device and the hydraulic lifting device are operable, the lifting of the boom and the lifting of the hook or the cargo handling combining them can be continued, so that the cargo handling efficiency can be improved.
According to the second aspect of the present invention, the communication to the first supply / exhaust circuit is alternatively selected by the switching valve, so that it is possible to reliably stop the operation of the hydraulic swing, lift, and lift devices or continue the operation. .
According to the third aspect of the present invention, since the supply / discharge control circuit is activated in the region of the elevation angle of 75 ° to 80 ° where the boom support structure is likely to be damaged, the damage prevention effect is ensured and the part of the cargo handling area is enlarged. can do.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram of a supply / discharge control apparatus according to an embodiment of the present invention.
In FIG. 1, SW is a swing winch, M1 is a hydraulic motor for the swing winch, and these constitute a hydraulic swing device as defined in the claims. TW is a lifting winch, M2 is a hydraulic motor for the lifting winch, and these constitute a hydraulic lifting device as defined in the claims. CW is a lifting winch, M3 is a hydraulic motor for the lifting winch, and these constitute a hydraulic lifting device as defined in the claims.

  P is a pump which is a hydraulic power source. Reference numeral 11 denotes a supply oil path from the pump P to the turning hydraulic motor M1, and 12 denotes a discharge oil path of the hydraulic motor M1. These oil paths 11 and 12 constitute a first supply / discharge circuit. 13 is a supply oil path to the lifting hydraulic motor M2 connected to the discharge oil path, 14 is a discharge oil path of the hydraulic motor M2, and these oil paths 13, 14 constitute a second supply / discharge circuit. ing. Reference numeral 15 denotes a supply oil path to the lifting hydraulic motor M3 connected to the discharge oil path 14, and 16 denotes a discharge oil path of the hydraulic motor. These oil paths 15 and 16 constitute a third supply / discharge circuit. ing. The oil passage 16 is connected to the suction port of the pump P, and the oil passages 11 to 16 are closed circuit as a whole.

The oil passages 11 and 12 are provided with a turning operation valve V1, the oil passages 13 and 14 are provided with a lifting operation valve V2, and the oil passages 15 and 16 are provided with a lifting operation valve V3. ing. Each of the operation valves V1, V2, and V3 is a manual operation type and is a directional control valve at a 4-port 3 position. At the pushing position or the pulling position of each operation valve V1 to V3 obtained by pushing and pulling the lever, each motor M1 to M3 rotates forward or reverse. Since the hydraulic oil supply to the motors M1 to M3 is cut off at the neutral position, the motors M1 to M3 maintain the stopped state. The neutral valve passage communicates from the inlet side to the outlet side. That is, the oil passages 11 and 12 communicate with the operation valve V1, the oil passages 13 and 14 communicate with the operation valve V2, and the oil passages 15 and 16 communicate with the operation valve V3. Therefore, among the three hydraulic motors M1 to M3 connected in series, the latter hydraulic motor can be driven even when the former hydraulic motor is stopped (that is, the operation valve is in the neutral state).
Of course, when the front-side operation valve is in the pushing position or the pulling position, which is the driving position, the hydraulic oil is naturally supplied to the hydraulic motor from the discharge oil passages 12 and 14 through the supply oil passages 13 and 15 via the rear-stage operation valves. Therefore, the hydraulic motor on the rear stage side can be driven.

  Reference numeral 20 denotes a switching valve constituting a supply / discharge control circuit. This switching valve 20 is a 4-port 2-position directional control valve, and is interposed in the oil passages 11 and 12 between the pump P and the swing operation valve V1, that is, the first supply / discharge circuit. In the switching valve 20, the oil passages 11 and 12 communicate with each other at the spring-biased normal position “a”. Therefore, each motor M1-M3 can be rotated forward and backward. When the switching valve 20 is solenoid-driven to change to the switching position b, the oil passage 11 and the oil passage 12 are communicated by the internal bypass passage 21. Further, the oil passages 11 and 12 on the hydraulic motor M1 side are blocked. For this reason, the turning motor M1 is in a drive stop state, and only the elevation motor M2 and the lifting motor M3 can be driven.

  Reference numeral 10 denotes an elevation angle sensor that detects the elevation angle of the boom 4. When the elevation angle of the boom 4 is between 70 ° and 85 °, the elevation / elevation angle sensor 10 outputs a detection signal, and based on this, a drive signal is outputted from the controller (not shown) to the solenoid 22 of the switching valve 20. It has become. The elevation / elevation angle sensor 10 and the controller described here constitute an activation means as defined in the claims.

Next, the cargo handling work of the derrick type cargo handling apparatus of this embodiment will be described.
When the boom 4 is in an elevation angle of 30 ° to 70 °, as shown in FIG. 1, the switching valve 20 is in the spring biased normal position a, so that the hydraulic oil discharged by the pump P is hydraulic motor M1. , M2, and M3 are supplied and discharged in this order. For this reason, by manually operating the operation valves V1, V2, and V3, all of the turning winch SW, the lifting winch TW, and the lifting winch CW can be freely driven. Therefore, complete cargo handling work is possible.
When the boom 4 increases the elevation angle and exceeds 70 °, the sensor 10 detects and outputs a solenoid drive signal from the controller. As a result, since the switching valve 20 is replaced by the switching position b by the solenoid 22, the hydraulic oil in the oil passage 11 discharged by the pump P is supplied to the oil passage 13 via the bypass passage 21 in the switching valve 20. The Since the hydraulic oil in the oil passage 13 further flows through the oil passages 14, 15, and 16, the uplift motor M2 and the lifting motor M3 can be driven. However, since refueling is cut off from the switching valve 20 to the turning motor M1 side, the turning motor M1 does not move.
As a result, the turning winch SW is stopped, and the raising / lowering winch TW and the lifting winch CW are inoperable. Therefore, only the raising / lowering operation of the boom 4 and the lifting / hanging of the hook 5 are performed while the turning of the boom 4 is restricted. It becomes possible.

  Therefore, in the derrick type cargo handling device of the present embodiment, the boom 4 does not turn in the chain line hatching region shown in FIGS. 2A and 2B, that is, in the range of the elevation angle 70 ° to 85 ° of the boom 4. The boom support members such as the eyepiece and the heelpiece are not destroyed. And since the raising / lowering operation of the boom 4 and the raising / lowering of the hook 5 can be continued and operated, cargo handling such as pulling in the cargo becomes possible. That is, in the partially movable range shown by hatching in FIG. 2B, cargo handling operations other than turning are possible, and cargo handling efficiency can be improved.

Next, another embodiment of the present invention will be described.
In each of the above-described embodiments, a winch driven by a hydraulic motor is used. Instead of using a winch, the present invention can be applied to various actuators such as a hydraulic cylinder that drive a boom and raise and lower a hook. The hydraulic turning device, hydraulic lifting device, and hydraulic lifting device referred to in the claims are intended to include those using actuators other than winches.
In the above embodiment, the range in which the partial cargo handling is performed is set to the elevation angle 70 ° to 85 ° of the boom 4, but this range may be appropriately changed according to the support structure of the boom 4.
In the above-described embodiment, the supply / discharge control circuit is configured using the switching valve 20, but any other configuration may be used as long as the swivel operation can be disabled and the lifting and lifting operations can be permitted. A control circuit may be used.

  INDUSTRIAL APPLICABILITY The present invention can be used not only for ships such as cargo ships but also for derrick-type cargo handling devices used on land and others.

It is a circuit diagram of the supply / discharge control apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the derrick type cargo handling apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the conventional derrick type cargo handling apparatus. It is a side view of the gooseneck part in the conventional derrick type cargo handling apparatus. It is a front view of the gooseneck part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Post 2 Gooseneck body 3 Gooseneck 4 Boom 10 Elevation angle sensor 20 Switching valve SW Turning winch TW Lifting winch CW Lifting winch M1 Hydraulic motor for turning winch M2 Hydraulic motor for lifting winch M3 Hydraulic motor for lifting winch V1 Swing operation valve V2 Lifting operation valve V3 Lifting operation valve

Claims (3)

Gooseneck that is pivotably attached to the gooseneck body of the post,
A boom attached to the gooseneck,
A hook suspended from the boom;
A hydraulic turning device for turning the boom;
A hydraulic lifting device for lifting the boom;
A hydraulic lifting device for raising and lowering the hook;
Supply of hydraulic oil to the hydraulic swivel device interposed between the hydraulic swivel device and a hydraulic power source is prevented, and supply of hydraulic oil to the hydraulic lifting device and the hydraulic lifting device is prevented. A derrick-type cargo handling system comprising: a supply / discharge control circuit that allows discharge; and an activation means that activates the supply / discharge control circuit by detecting that the boom elevation angle is equal to or greater than a set value. apparatus. The supply / discharge control circuit
A first supply / discharge circuit connecting between a hydraulic source and the hydraulic swing device; a second supply / discharge circuit connecting between the hydraulic source and the hydraulic lifting device; the hydraulic source and the hydraulic lifting device A third supply / exhaust circuit connecting between
A position where the hydraulic power source communicates with all of the first supply / discharge circuit, the second supply / discharge circuit, and the third supply / discharge circuit; and the supply / discharge to the first supply / discharge circuit is prevented; 2. The derrick type cargo handling apparatus according to claim 1, comprising a switching valve that selectively switches between a supply / discharge circuit and a position that allows supply / discharge to the third supply / discharge circuit. A sensor for detecting that the boom elevation angle is not less than 75 ° and not more than 80 °;
The derrick-type cargo handling device according to claim 2, further comprising a controller that receives the detection signal of the switch and performs switching drive of the switching valve.