JPH0825712B2 - Counterbalanced crane - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a counterbalance type crane configured by connecting counterweight carriages that share a lifting load.

[0002]

2. Description of the Related Art A counterbalance type crane, as shown in FIG. 3, includes a crane main body 3 having a lower traveling body 1 and an upper revolving superstructure 2, and a counterweight carriage 5 having a counterweight 4 mounted thereon. The counter weight truck 5 is configured to be connected with the counter weight truck 6 to increase the crane capacity.

In the figure, 7 is a boom, 8 is a mast that supports the boom 7 via a boom guy line 9, and 10 is a truck guy line that connects the mast 8 and the counterweight truck 5.

In such a counterbalance type crane, the wheels W of the counterweight carriage 5 are constructed to be steerable, and the wheels W ...
Driven by a trolley traveling motor), the trolley 5 is made to follow the crane main body 3 so as to travel straight (forward or backward) as shown in FIG. 4 and turn as shown in FIG. It is known as disclosed in JP-A-62-16088.

On the other hand, in the counter-balance type crane, up to now, it was considered only to make the counterweight carriage 5 follow the turning and straight traveling of the crane body 3, but recently, for example, a load is hung over a building. For the purpose of moving along the building as it is, a new request is made to traverse the counterweight carriage 5 with the main body 3 in a state of being positioned on the side of the crane main body 3 as shown in FIG. There is.

[0006]

However, when the traveling direction of the lower traveling body 1 of the crane body 3 and the traveling direction of the counterweight carriage 5 do not coincide with each other during the traverse traveling, the upper revolving body 2 revolves and the load sways. Dangerous situations such as those occur.

However, since the conventional counterbalance type crane does not deal with such a problem at all, the traverse traveling is actually carried out for the purpose of avoiding the danger although it is theoretically possible. Didn't.

[0008] Therefore, the present invention provides a counterbalance type crane capable of traversing only in a condition where the matching condition is satisfied and ensuring safety.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a counterweight truck is arranged behind a crane body having a lower traveling body driven by a hydraulic motor and an upper revolving body. The counterweight cart is connected to the revolving structure by a connecting member, and the wheels of the counterweight car are configured to be steerable, the wheels are driven by a hydraulic motor, and the counterweight car is moved rearward with respect to the undercarriage. A counterbalanced crane configured to be capable of traveling in a straight traveling mode in which the counterweight cart travels and a traverse traveling mode in which the counterweight carriage travels to the left or right of the lower traveling vehicle. A traveling direction detecting means for detecting a traveling direction of the lower traveling body; a traveling mode detecting means for detecting a traveling mode; Wheel direction detection means for detecting the direction of the wheels of the tawait truck, a main body traveling motor control circuit for controlling the supply and discharge of pressure oil to the hydraulic motor of the lower traveling body, and the supply and discharge of pressure oil to the hydraulic motor of the truck. The vehicle traveling motor control circuit for controlling, and traveling control means for outputting a drive signal to these both control circuits, the traveling control means, based on the detection result of each of the detection means,
On condition that the direction of the wheels is compatible with the traveling mode, a motor drive signal in the direction in which the wheel rotation direction matches the traveling direction of the lower traveling body is output to the carriage traveling motor control circuit, and the above conditions are met. When not present, a motor drive stop signal is output to the main body traveling motor control circuit.

[0010]

According to the above construction, the carriage traveling motor rotates in accordance with the traveling direction of the lower traveling body on condition that the crane is in the traveling traveling mode and the direction of the wheels is adapted to the traveling traveling mode. In other situations, the main body traveling motor does not rotate, and therefore the carriage traveling motor also does not rotate, so that transverse traveling is not possible.

That is, since the lower traveling body and the counterweight carriage can always travel only in the same direction,
It is possible to ensure safety without the risk of causing a dangerous situation such as the upper revolving structure turning due to the fact that the traveling directions of the two do not coincide during traverse traveling.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the hydraulic control circuit shown in FIG. 2, 11 is a traveling hydraulic motor for a lower traveling body (hereinafter referred to as main body traveling motor), 12 is a carriage traveling motor, 13 is a pump for the main body traveling motor 11, and 14 is A pump for the carriage traveling motor 12, 15 is a pilot type switching valve (hereinafter referred to as a body motor control valve) for controlling the supply and discharge of pressure oil to and from the main body traveling motor 11, and 16 is supply and discharge of pressure oil to and from the carriage traveling motor 12. It is an electromagnetic switching valve that is controlled (hereinafter referred to as a truck motor control valve).

The main body traveling motor 11 is actually provided for each of the left and right crawlers, and these are separately controlled. However, in order to make the explanation easy to understand, here, when both side crawlers travel in different directions. It is out of the question and only one is shown as they run in the same direction at the same time.
Further, the carriage traveling motor 12 is also provided for each of the plurality of wheels, but since they always rotate in the same direction at the same time, only one is shown for the same purpose.

The main body motor control valve 15 is operated by switching between a forward rotation position and a reverse rotation position by operating a remote control valve 17 provided in a driver's seat of the crane body, and the main body traveling motor 11 moves forward at the forward rotation position. The motor 11 at the rotation and reverse positions
Rotates backwards.

The remote control valve 17 and the main body motor control valve 1
The forward traveling and backward traveling pressure switches 20 and 21 are connected to the forward traveling and backward traveling pilot lines 18 and 19 that connect the two pilot chambers 15a and 15b of the vehicle 5, respectively.
Both pressure switches 2 depending on the direction of travel
One of 0 and 21 is turned on.

An electromagnetic switching valve for interlock (hereinafter referred to as an interlock valve) 24 is provided on a primary side pipe line 23 for supplying the primary pressure from the operation pump 22 to the remote control valve 17.
Is provided.

The interlock valve 24 is in the interlock position B shown in the figure when the solenoid 24a is not energized, and stops the supply of the primary pressure to the remote control valve 17, and when the solenoid 24a is energized, the interlock valve 24 is interlocked. Switching to the release position (b), the primary pressure is supplied to the remote control valve 17.

Therefore, at the interlock position B, since the pilot pressure is not supplied from the remote control valve 17 to the main body motor control valve 15, the control valve 15 is held at the neutral position and the main body traveling motor 11 does not rotate. That is, as will be described later, the interlock is provided so that the lower traveling body 1 does not travel under a condition where predetermined traveling conditions are not satisfied.

Further, the carriage motor control valve 16 is switched and operated by selectively energizing both the forward rotation side and reverse rotation side solenoids 16a and 16b, and when the control valve 16 is in the forward rotation position, the carriage traveling motor 12 is driven. The motor 12 rotates in the forward and reverse positions.

In FIG. 2, reference numerals 25, 26 and 27 are relief valves.

On the other hand, FIG. 1 shows an electric control circuit.
Explaining from the upper side of the drawing, the series circuit of the forward pressure switch 20 and the forward detection relay 28 and the series circuit of the reverse pressure switch 21 and the reverse detection relay 29 are connected to the power source, respectively, and when the lower traveling body moves forward ( The forward detection relay 28 operates during leftward travel of FIGS. 4 to 6 and the reverse detection relay 29 operates during reverse travel.

Reference numeral 30 denotes a leftward detection switch which is turned on when the crane is set to the leftward traveling posture shown in FIG. 6, and 31 is a rightward detection switch which is turned on when the crane is set to the right transverse traveling posture opposite to FIG. Then, these are provided between the lower traveling structure 1 and the upper revolving structure 2, and the leftward detection relay 32 is turned on by turning on the leftward detection switch 30.
When the rightward detection switch 31 is turned on, the rightward detection relay 33 is activated.

Further, the first normally open contact 32a1 of the leftward detection relay 32 and the first normally open contact 28a of the forward movement detection relay 28.
1 is connected in series, and rightward detection relay 3
No. 3 first normally open contact 33a1 and first reverse detection relay 29
The normally open contact 29a1 is connected in series, the series circuits are connected in parallel, and the carriage motor control valve 16
The normal rotation side solenoid 16a is connected to this contact circuit in series.

Further, the first normally open contact 32a1 of the leftward detection relay 32 and the second normally open contact 29 of the reverse detection relay 29 are provided.
a2 is connected in series, the first normally open contact 33a1 of the rightward detection relay 33 and the second normally open contact 28a2 of the forward detection relay 28 are connected in series, and both series circuits are connected in parallel and The reverse rotation side solenoid 16b of the carriage motor control valve 16 is connected in series with the contact circuit.

As a result, (a) as shown in FIG. 6, when the counterweight carriage 5 is facing left and the undercarriage 1 is moving forward, and oppositely to FIG. Is backwards,
The carriage traveling motor 12 rotates forward.

(B) When the counterweight carriage 5 is facing left and the undercarriage 1 is moving backward, and when the carriage 5 is facing right and the undercarriage 1 is moving forward, the carriage running motor 1 is
2 reverses.

In this way, the counterweight carriage 5 is constructed so as to travel in the same direction as the lower traveling body 1 during lateral travel.

As another condition, it is necessary that the wheels W are set in a direction (a straight traveling direction in FIG. 4, a transverse direction in FIG. 6) suitable for straight traveling and transverse traveling. .

Therefore, when this condition is not satisfied, an interlock function for stopping the traveling of the undercarriage 1 is activated.

That is, the second normally open contacts 32a2, 33a2 of both the left-handed and right-handed detection relays 32, 33 are connected in parallel, and the traverse detection relay 34 which operates when either of them is turned on is provided. There is.

Further, as the wheel direction detecting means, the wheels W ...
Wheel transverse direction detection switch 35 for detecting that the vehicle has been set in the transverse direction, and wheel straight traveling direction detection switch 36 for detecting that the wheels W have been set in the straight traveling direction.
A counter switch (for example, a limit switch or a proximity switch) is provided on the counterweight carriage 5, and when the wheel transverse direction detection switch 35 is turned on, the wheel transverse detection relay 37 is turned on, and when the wheel straight traveling direction detection switch 36 is turned on, the wheel straight traveling detection relay 38 is turned on.
Operate respectively.

On the other hand, the normally closed contact 34 of the traverse detection relay 34
b and the normally open contact 38a of the wheel straight advance detection relay 38 in series, the normally open contact 34a of the transverse detection relay 34, the normally open contact 37a of the wheel transverse detection relay 37, and the third normally open contact 28a3 of the forward movement detection relay 28 in series. Respectively connected to. The third normally open contact 29a3 of the reverse detection relay 29 is connected in parallel to the third normally open contact 28a3.

An interlock relay 39 is connected to this contact circuit, and when the normally open contact 39a of the relay 39 is turned on, the solenoid 24a of the interlock valve 24 is turned on.
Are configured to be energized.

With this configuration, when the counterweight carriage 5 is in the straight traveling position,
When the wheel W is in the straight traveling direction and the bogie 5 is in the lateral or lateral traverse position, the wheels W are in the transverse direction and the lower traveling body 1 is in the forward or reverse direction. Is set to the interlock release position b.

Therefore, under this condition, the lower traveling body 1 can travel, and following this, the counterweight carriage 5 can also travel.

On the contrary, a situation other than the above, that is, when the wheels W are in the traverse direction of FIG. 6 even when the counterweight truck 5 is in the straight traveling direction, and vice versa, the truck 5 is in the traverse position. When the wheels W are in the straight-ahead position, the interlock valve 24 is switched to the interlock position a, so that the traveling of the lower traveling body 1 is stopped and the traveling of the carriage 5 is also disabled.

This interlock function prevents erroneous traveling operation and ensures safety.

By the way, in the above embodiment, the truck motor control valve 16 and the interlock valve 24 are provided by the relay circuit.
However, the control may be performed by a computer.

[0039]

As described above, according to the present invention, the traveling direction of the lower traveling body, the traveling mode (straight traveling, lateral traveling in either left or right direction), and the direction of the wheels of the counterweight carriage are respectively set. Detecting, based on the detection result of each of the detecting means, the rotation direction of the wheels in the carriage traveling motor control circuit matches the traveling direction of the lower traveling body on the condition that the direction of the wheels is adapted to the traveling mode. The motor drive signal of the direction is output, and when the above conditions are not met, the motor drive stop signal is output to the main body drive motor control circuit.Therefore, the undercarriage and the counterweight carriage should always travel in the same direction. You can

In other words, during lateral traveling, there is no risk of causing a dangerous situation such as the upper revolving structure turning due to the fact that the traveling directions of the lower traveling structure and the counterweight bogie do not coincide, and safety can be ensured. This makes it possible to traverse as a real problem.

[Brief description of drawings]

FIG. 1 is an electric control circuit diagram of a counterbalance type crane according to an embodiment of the present invention.

FIG. 2 is a hydraulic control circuit diagram of the crane.

FIG. 3 is a diagram showing a general configuration of a counterbalance type crane.

FIG. 4 is a schematic plan view of the crane during straight traveling.

FIG. 5 is a schematic plan view of the crane at the time of turning.

FIG. 6 is a schematic plan view of the same crane during lateral traveling.

[Explanation of symbols]

1 Lower Traveling Body 2 Upper Revolving Body 3 Crane Main Body 4 Counterweight 5 Counterweight Carriage W Wheel of the same Carriage 6 Connecting Member 11 Motor for Running the Lower Carriage 15 Main Motor Motor Control Valve Constituting the Control Circuit of the Motor 17 Same Remote control valve 12 Motor for running counterweight truck 16 Bogie motor control valve constituting a control circuit of the motor 20, 21 Pressure switch 30, 31 as traveling direction detecting means Left, right direction detecting switch 35 as traveling mode detecting means 36 Wheel direction detection switch 28, 29, 32, 33, 34, 37, 38, 39 for detecting the direction of the wheel of the vehicle 24 Relay 24 constituting the traveling control means 24 Same interlock valve

Claims (1)

[Claims] 1. A counterweight bogie is disposed behind a crane main body having a lower traveling body and an upper revolving superstructure driven by a hydraulic motor, and the counterweight bogie and the upper revolving superstructure are connected by a connecting member. In this counterweight bogie, the wheels are configured to be steerable, the wheels are driven by a hydraulic motor, and the counterweight bogie travels in a state in which the counterweight bogie is positioned rearward with respect to the lower traveling body. In a counterbalance type crane configured to be capable of traveling in a mode and in a traverse traveling mode in which the counterweight carriage is located on the left or right side of the undercarriage, the traveling direction of the undercarriage is Traveling direction detecting means for detecting, traveling mode detecting means for detecting traveling mode, and direction of the wheels of the counterweight truck. Wheel direction detection means for detecting the pressure, a main body traveling motor control circuit for controlling the supply and discharge of pressure oil to and from the hydraulic motor of the lower traveling body, and a carriage traveling motor for controlling the supply and discharge of pressure oil to and from the hydraulic motor of the truck. It is provided with a control circuit and a traveling control means for outputting a drive signal to both of these control circuits, and the traveling control means has the direction of the wheels adapted to the traveling mode based on the detection result of each of the detection means. Under the above conditions, a motor drive signal is output to the carriage traveling motor control circuit in the direction in which the rotation direction of the wheels matches the traveling direction of the lower traveling body, and when the above conditions are not satisfied, the main body traveling motor control circuit is driven by the motor. A counterbalanced crane, which is configured to output a stop signal.