JPH0633157B2 - Forklift truck cargo handling machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a lift for loading or unloading various cargoes as a unit during loading and unloading into a berth, freight cars, containers, transport trucks, etc. -For more details on the load push pull installed at the end of the truck, refer to the front and rear expansion and contraction of the face plate provided on the front of the load push. The present invention relates to a control device.

<Problems to be solved by conventional technology and device> Conventionally, in cargo handling work using a forklift truck,
Most of the adjustments of the front-back movement of the face plate and the front-back movement of the vehicle body for loading or unloading luggage at a certain place are performed manually, which is very difficult and complicated.
Therefore, for example, as disclosed in Japanese Patent Laid-Open No. 57-195098, a device for electrically detecting the vehicle speed with respect to the movement of the vehicle body and controlling and adjusting so as to synchronize the speed of the face plate and the Japanese Patent Publication
There are devices such as 53-38862 and Japanese Utility Model Publication No. 54-44361 in which the mechanism of the face plate and the bed itself is mechanically improved. However, when electrically controlled as in the above-mentioned JP-A-57-195098, the circuit becomes complicated,
In addition, in the case of JP-B-53-38862 and JP-B-54-44361, the face plate and the bed are mechanically improved, but the device itself is complicated or large. The current situation is that it has not been put to practical use.

Also, since the vehicle body and the drive source for driving the face plate are separate, the hydraulic pump cannot obtain a sufficient rotation speed from the engine even if it is electrically controlled, and therefore the required oil amount is reduced. It is not possible to secure it, and there are many cases that it interferes with the synchronous operation.

In order to solve the above-mentioned problems, the present invention provides a working machine control device that comprises a hydraulic circuit that divides the amount of oil sent from a hydraulic pump into a hydraulic motor that is a mechanism for driving a push-pull cylinder and a vehicle body. It is intended to provide.

<Means for Solving the Problems> The above object of the present invention can be achieved by a cargo handling machine control device having the following mechanism. In other words, the gist is to divide the amount of oil sent from the hydraulic pump in a forklift truck in which a loading platform having a face plate that can be moved back and forth by a platen and a push-pull cylinder is attached to the front of the vehicle body so that it can move up and down. Flow control is performed by a valve or a diversion / collection control valve by a push-pull cylinder and a hydraulic motor that is a mechanism for driving the vehicle body back and forth, and a hydraulic circuit is constructed so that the speed of the face plate and the longitudinal speed of the vehicle body are synchronized. A load handling machine control device for a forklift truck, characterized in that a hydraulic circuit for shunt control is configured so that the front-back motion speeds of the vehicle body are synchronized with each other only by pulling or pushing the face plate. It is a feature.

<Examples and Actions> Hereinafter, a cargo handling machine control device for a forklift truck according to the present invention will be described in detail with reference to the drawings showing the examples.

1 and 2 are a side view and a plan view of a forklift truck showing an embodiment of the present invention.
A vertical mast (2) is tiltably attached to the front part of (1), and a platform (4) having platens (3) and (3) attached to the lower ends of both sides is vertically movable on the mast (2). Is attached to.

Therefore, the face plate (6) is connected to the pedestal (4) by the push-pull cylinder (5) so as to extend and retract in the front-rear direction via the pantograph structure (7). A face gripper with a mechanism for gripping a rug such as a sheet is provided at the bottom of both sides of the plate (6).
(8) and (8) are provided.

That is, the push-pull cylinder (5) extends and contracts the pantograph structure (7), and
The plate (6) can be moved back and forth, and in the control device of the present invention, in order to synchronize the forward and backward moving speed of the face plate (6) and the speed of the vehicle body (1) moved back and forth accordingly. , The amount of oil sent from the hydraulic pump is diverted by the shunt collecting valve, and the push-pull cylinder (5) and vehicle body
A hydraulic circuit for driving and controlling (1) to a synchronous speed is configured.

The basic circuit diagram of this hydraulic circuit is shown in FIG.
(9) is a hydraulic pump, (10) is an oil tank, (11) and (11) are directional switching valves, and (12) and (12 ') are shunt control valves for one-way tuning for controlling the going process of oil feeding. , (13) is a pressing cylinder for pressing the power transmission roller (14) to the tire (16), and (17) is a shuttle valve for feeding oil when pushing or pulling to the pressing cylinder (15). Is shown. Therefore, FIG. 4 shows the push operation. First, the engine transmission gear is set to the neutral state, and the vehicle body (1)
Sufficiently increase the rotational speed of the hydraulic pump (9) while sufficiently increasing the rotational speed of the engine mounted on. Next, turn the directional control valve (1
By switching 1) and (11) to push operation, oil is sent from the hydraulic pump (9) in the direction of arrow a in the figure, and divided by the flow dividing control valve (12) in the directions of arrow a'and a "in the figure. ,
Oil in the direction of arrow a'on one side is the push-pull cylinder (5)
The face plate (6) is extruded through the pantograph structure (7) and the oil in the direction of the a ″ arrow is sent to the hydraulic motor (13) and the shuttle valve ( 1
7) The oil is fed into the hydraulic cylinder (15) and the power transmission roller (14) is pressed against the tire (16), and the driving force of the hydraulic motor (13) drives the power transmission roller (14). Rotate and rotate the tire (16) that presses against it
(1) is configured to be moved rearward, and in this case, the push-pull is performed in advance by the shunt control valve (12) so that the speed of the vehicle body (1) and the speed of the face plate (6) are synchronized. It controls the amount of oil sent to the cylinder (5) and hydraulic motor (13), and the oil pushed out from the push-pull cylinder (5) and hydraulic motor (13) is Oil is sent in the directions of arrows b ', b ", further collected by the flow dividing control valve (12'), sent in the direction of arrow b in the figure, and circulated to the oil tank (10).

Next, FIG. 5 shows the pulling operation. After increasing the rotational speed of the hydraulic pump (9) in the same manner as described above, the directional control valves (11), (11) are switched to the pulling operation. That is, oil is sent from the hydraulic pump (9) in the direction of the arrow a in the figure, and further the diversion control valve
(12 ') splits the oil in the direction of the arrows a'and a "in the figure, and the oil in one of the directions of the arrow a'is sent to the push-pull cylinder (5) and is transferred to the face / surface through the pantograph structure (7).
The plate (6) is pulled, and the oil in the direction of the other a ″ is sent to the hydraulic motor (13) and the shuttle valve (17)
Oil is fed into the hydraulic cylinder (15) by the hydraulic power transmission roller (14) and is brought into pressure contact with the tire (16).
The power transmission roller (14) is driven and rotated by the driving force of (13), and the tire (16) in pressure contact with it is rotated to rotate the vehicle body (1).
Is to move forward. Also in this case, the push-pull cylinder is arranged so that the speed of the vehicle body (1) and the speed of the face plate (6) are synchronized by the flow dividing control valve (12 ').
(5) and the hydraulic motor (13) are used to perform the diversion control of the amount of oil sent. Next, the oil extruded from the push-pull cylinder (5) and the hydraulic motor (13) is fed in the direction of the arrows b ', b "in the figure, and is collected again by the flow dividing control valve (12). The oil is sent in the direction of the middle b arrow and circulated to the oil tank (10).

Further, the hydraulic basic circuit shown in FIG. 6 shows a case where a branching / collecting control valve (18) for reciprocating tuning for controlling both going and returning steps is incorporated.

That is, in the case of the push operation shown in FIG. 7, the directional control valve
By (11) and (11 '), oil is sent from the hydraulic pump (9) in the direction of the arrow a in the figure, and further split from the diversion point c in the directions of the arrows a'and a "in the direction of one a' arrow. Oil is sent to the push-pull cylinder (5), and the oil pushed out accordingly is sent in the direction of the arrow b'in the figure, and is sent to the diversion / collection control valve (18). The oil in the direction of "a" is sent to the hydraulic motor (13), is sent from the hydraulic motor (13) in the direction of the b "arrow in the figure, and is sent to the diversion / collection control valve (18). By controlling the flow collection by the flow dividing and collecting control valve (18), the amount of oil divided from the flow dividing point c in the directions of the arrows a'and a "in the figure is necessarily divided. This means that the speed of the vehicle body (1) and the speed of the face plate (6) operate in synchronism with each other, and the oil collected by the flow control valve (18) is b in the figure. Are those oil feeding the mark direction. Next, FIG. 8 shows the case of pulling operation, in which the hydraulic pump is operated by the directional control valves (11) and (11 ').
From (9), oil is fed in the direction of arrow a in the figure, and the flow is divided and controlled by the branching / collecting control valve (18), and the flow is divided in the directions of arrow a'and a "in the direction of arrow a '. The oil is fed into the push-pull cylinder (5), while the oil in the direction of the a ″ arrow is fed into the hydraulic motor (13), which causes the vehicle body (1) speed and the face plate (6) speed. Operate in synchronism with the hydraulic motor (13) and push-pull cylinder (5).
The oil pushed out from the inside is sent in the directions of the arrows b ', b "in the figure, collected at the branch point c, and circulated in the direction of the arrow b in the figure.

Next, FIG. 9 is a hydraulic basic circuit diagram for performing synchronous control of only push operation or pull operation (in this embodiment, only push operation is shown). Directional switching valves (11), (11 ')
The oil is sent from the hydraulic pump (9) in the direction of the arrow a in the figure, and further divided by the flow dividing control valve (12) in the directions of the arrows a'and a ", and the oil in one direction of the arrow a'is pushed. Oil is fed into the pull cylinder (5), and the other oil in the direction of the a "arrow is fed into the hydraulic motor (13), so that the face plate (6) push speed and the vehicle body (1) speed are increased. The oil is controlled to be synchronized with each other, and the oil pushed out from the push-pull cylinder (5) and the hydraulic motor (13) is sent in the direction of arrow b in the figure.

The driving of the tire (16) of the vehicle body (1) in each of the above hydraulic circuit diagrams is indirectly transmitted by the power transmission roller (14).
It is also conceivable to use a drive method such as direct drive via a transmission, and it is desirable to adopt the most suitable drive transmission mechanism according to the situation.

In the control device of the present invention having the above configuration, FIG.
As shown in (b) and (c) respectively, when the luggage A ₁ is stacked on the luggage A at the same position, the platen of the pedestal (4) of the vehicle body (1)
(3), the luggage A ₁ loaded on the (3) is positioned on the luggage A, and the drive transmission gear of the tire (16) of the vehicle body (1) is set to the neutral state, and the vehicle body (1) is After sufficiently increasing the rotation speed of the engine mounted on the engine, increase the rotation speed of the hydraulic pump (9), and then push the directional control valves (11) and (11) into the push operation to From the state above body (1)
The hydraulic motor (13) drives the tire (16), and the face plate (6) is simultaneously pushed out by the push-pull cylinder (5) via the pantograph structure (7) at a synchronized speed. Further, as shown by (b) and (c) in the figure, only the luggage A ₁ can be placed on the luggage A. When unloading the luggage A ₁ from above the luggage A, the rug provided at the lower end of the luggage A ₁ is gripped by the face grippers (8) and (8) below the face plate (6) and the vehicle body ( After setting the drive transmission gear of 1) to the neutral state and increasing the rotation speed of the hydraulic pump (9), put the directional control valves (11) and (11) into pull operation to pull the body (1) and the face. When the plates (6) are simultaneously controlled at the synchronous speed, they are stacked on the platens (3) and (3) in the order of (c), (b) and (a) in the figure.

<Effects of the Invention> As described above, according to the present invention, the hydraulic pressure sent from the hydraulic pump is controlled by the flow dividing control valve or the flow dividing / collecting control valve during the push or pull operation. By using a mechanism that operates by synchronizing the face plate by the push-pull cylinder and the vehicle body speed by the hydraulic motor, it is possible to accurately and easily load and unload cargo at a certain place.

Further, when the face plate is pushed or pulled, the drive engine of the vehicle body is separated from the drive engine, and the vehicle body is driven by a separately provided hydraulic motor, whereby the rotation of the hydraulic pump can be sufficiently increased by the drive engine. It is possible to supply a sufficient amount of oil necessary for the above, and it is possible to perform accurate and continuous work easily.

In addition, since the control mechanism is hydraulic, there are no failures due to electric systems, etc., and it has great durability against external shocks, and various effects such as assembly without complex mechanism are possible. It plays.

[Brief description of drawings]

FIG. 1 is a side view of a forklift truck according to an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a basic hydraulic circuit diagram of a control device of the present invention, and FIGS. 4 and 5 are the same. FIG. 6 is an explanatory diagram showing an operating state, FIG. 6 is a basic hydraulic circuit diagram showing another example of the control device of the present invention, FIGS. 7 and 8 are explanatory diagrams showing the same operating state, and FIG. 9 is the present invention. Basic hydraulic circuit diagram showing only the push operation of the control device of Fig. 10, Fig. 10 (a),
(B) and (C) are explanatory views of the operation of the present invention. In the figure, (1): vehicle body (3), (3): platen (4): stand (5): push-pull cylinder (6): face plate (7): pantograph structure (8), (8) : Face gripper (9): Hydraulic pump (12), (12 '): Flow control valve (13): Hydraulic motor (16): Tire (18): Flow control valve

Claims (2)

[Claims] Claim: What is claimed is: 1. In a forklift truck having a loading platform having a face plate that can be moved back and forth by a platen and a push-pull cylinder mounted on the front portion of a vehicle body so as to be vertically movable, the amount of oil fed from a hydraulic pump is divided. A push-pull cylinder and a mechanism for driving the vehicle body back and forth and a hydraulic motor are controlled by a control valve or a flow dividing / collecting control valve to control the flow diverting, and a hydraulic circuit is constructed so that the speed of the face plate and the longitudinal speed of the vehicle body are synchronized. A cargo handling machine control device for forklift trucks characterized by the above. 2. A forklift truck in which a loading platform having a face plate movable back and forth by a platen and a push-pull cylinder is vertically movably mounted on a front portion of a vehicle body, and the amount of oil fed by a hydraulic pump is diverted. A hydraulic circuit for controlling the push-pull cylinder and the vehicle body by a control valve is provided with a hydraulic circuit for shunt control such that the front-rear speeds of the vehicle body are synchronized with each other only by pulling or pushing the face plate. A cargo handling machine control device for a forklift truck.