JPS5839105B2 - Steering device for rotating loader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering device for a swing loader, and facilitates the operation of a steering operating device and a traveling operating device.

Conventionally, in a traveling vehicle that has a driver's seat on a swivel base, when the direction of the vehicle body and the swivel base are the same, that is, when the driver's seat faces the forward direction of the vehicle body, the travel operation lever, Alternatively, if the operating direction of the steering control lever matches the moving direction of the vehicle body, but the orientation of the swivel base and the vehicle body do not match, in other words, the swivel base rotates backwards and the driver's seat faces rearward. If so, the operating direction of the steering operating lever or travel operating lever is opposite to the moving direction of the vehicle body.

If the driving control lever is operated forward, the vehicle will move backwards, and if the steering control lever is tilted to the right, the vehicle will turn left.The operating direction does not match the direction in which the vehicle is actually moving, making it very difficult to operate the vehicle. It is in a state where it is used.

Furthermore, if the swivel table is placed sideways, it may be difficult to determine which direction to operate the operating lever.

The present invention was invented in view of the above points, and the first
The purpose of this was to make the operating direction of the steering control lever and the moving direction of the vehicle body the same regardless of the position of the swivel base, and the second purpose was to make it possible for the swivel base to make a full turn while driving. It is something.

The configuration of the present invention includes a swivel base, a limit switch attached to the vehicle body, and means for detecting the position of the swivel base using a semicircular cam.
A swing operation lever, a means for detecting the position of the swing operation lever using a limit switch that engages with the lever, a first relay energized by the two limit switches, and a second relay energized by the first relay. , a control solenoid valve operated by a second relay, and a self-holding circuit for the second relay that can be selectively opened and closed between the circuit having the first relay and a limit switch that engages with the swing operation lever. be.

Regardless of the direction of the swivel table, the driver only needs to drive himself or herself or operate the steering device, making driving easier and less tiring.

It is also convenient because the swivel base can be fully rotated while the vehicle is running.

This will be explained in detail with reference to the drawings.

Reference numeral 1 denotes the body of a swing loader, and 3 is a swivel base. A limit switch 2 is installed below the front central portion of the swivel base 3 so as to face downward.

Reference numeral 4 denotes a cam installed on the upper part of the vehicle body 1, concentrically with the pivot point of the swivel base 3, and covering the rear half circumference of the circumference including the limit switch 2, so that the swivel base 3 can be moved to the right or left. When the vehicle turns more than 90 degrees, the limit switch 2 is activated by the cam 4 and is in such a position that it is turned ON.

Reference numeral 5 designates a turning operating lever, and a limit switch 6 is brought into contact with the operating lever 5. When the operating lever 5 is in the neutral position, the limit switch 6 is connected to the same A circuit as the other limit switches 2. When it is turned on on the side and tilted to the right or left, the other 8 circuits are turned on.

FIG. 5 is an electrical circuit diagram of the present invention, in which the A circuit includes the limit switch 2.6 and the first relay 7.

The C circuit has a relay contact 8 communicating with the first relay 7 and a second relay 9, so that when the first relay 7 is activated, the relay contact 8 is closed and the second relay 9 is activated. .

The 8th circuit has a limit switch 6 that is turned ON when the turning operation lever 5 is tilted to the right or left, and a relay contact 10 that communicates with the second relay 9, and the end of the 8th circuit is connected to the C It is connected between the relay contact 8 and the second relay 9 of the circuit.

The 9 circuit has a relay contact 11° communicating with the second relay 9 and an excitation coil 12, and the excitation coil 12 is connected to a solenoid valve 14 that controls oil from a remote control valve 13 for traveling.

The E circuit has a relay contact 15 communicating with the second relay 9 and an excitation coil 16, and the excitation coil 16 is connected to a solenoid valve 18 that controls oil from the steering switching valve 1γ.
is connected to.

Figure 6 is a hydraulic circuit diagram showing how the solenoid valves 14 and 18 in the electric circuit diagram shown in Figure 5 are located in the travel hydraulic motor circuit, where 19 is a hydraulic pump and 20 is a hydraulic circuit diagram. Hydraulic motor for traveling, 21 is a pilot switching valve for traveling, 22 is a main hydraulic pump, 23 is a main circuit, 24
is the pilot oil line.

Although the present invention is configured as described above, a case in which it actually operates will be explained.

(1) When both the swivel base 3 and the vehicle body 1 face forward.

The limit switch 2 at the front of the swivel base 3 is located at the front, and the cam 4 of the vehicle body 1 is located at the rear, separated from each other, so the limit switch 2 is turned off.

Therefore, irrespective of the state of the limit switch 6 operated by the turning operating lever 5, the A circuit is open and the first relay 7 of the A circuit is deenergized.

Therefore, the relay contact 8 connected to the first relay 7 is in the OFF state, and the C circuit is opened.

Therefore, the second relay 9 is in the de-energized state, the relay contacts 10, 11.15 leading to the second relay 9 are in the OFF state, B, ]), E circuit is open, D, E
The excitation coils 12, 16 in the circuit are deenergized.

The solenoid valves 14 and 18 are both in the normal position, and the operating direction of the driving remote control valve 13 or the steering switching valve 17 coincides with the moving direction of the vehicle body 1.

Furthermore, even when turning with the turning operation lever 5 tilted to the right or left, the limit switch 2 remains OFF if the turning angle of the turning base 3 is within 90 degrees to the left or right from directly in front. , is the same as the case described above.

(2) When the vehicle body 1 is facing forward and the swivel base 3 is facing backward.

The cam 4 at the rear of the vehicle body 1 acts on the limit switch 2 at the front of the swivel base 3 to turn it on.

When the turning operation lever 5 is in the neutral state, the limit switch 6 is turned on on the sleep path side, so current flows through the A circuit, energizing the 11th J relay γ, and the C circuit relay connected to it. Contact 8 closes, current flows through circuit C, energizes second relay 9, and relay contacts 10, 11 connected to it
．． 15 closes.

Current flows through circuits other than B circuit and E circuit, and excitation coil 12
．． 16 is energized and solenoid valves 14, 18 are both switched to the reverse position.

The direction of oil supply to the driving remote control valve 13, OYOHI, and steering switching valve 17 is reversed, so when these valves 13 and 17 are operated, the vehicle body 1 moves in the operated direction as in the case of forward facing. Move to.

Even when the swing operation lever 5 is tilted down and the travel remote control valve 13 or the steering switching valve 17 is operated while the swivel base 3 is turning, the limit switch 6 is set to A by operating the swing operation lever 5. Since the circuit side is turned OFF and current flows through the eight circuits, the second relay 9 is not deenergized, and the relay contacts 10, 11, and 15 remain closed, and the aforementioned swing operation lever 5 As in the case where the vehicle body 1 is in the neutral position, the operating direction of the steering switching valve 17 and the travel remote control valve 13 coincides with the moving direction of the vehicle body 1.

(3) When the swivel base 3 is in the process of turning from forward facing to rearward,
And if you are in the process of going from backward facing to forward facing.

When the swivel base 3 turns to the right or left and turns further backward from the side of the vehicle body 1, the cam 4 closes the limit switch 2.
to turn it on.

In this case, if the turning operation lever 5 is in the tilted state, that is, in the turning state, the limit switch 6 will be turned ON on the 8th circuit side and turned OFF on the A circuit side, so that the current will not flow in the A circuit. No current flows and the 11th J layer is not energized, so no current flows through circuits B, C, D, and E, and solenoid valves 14.18 are all in their normal positions.

Therefore, the operating direction of the driving remote control valve 13 or the steering switching valve 17 does not match the moving direction of the vehicle body 1.

Similarly, when the swivel base 3 turns forward from a rearward-facing position passing directly beside the vehicle body 1, if the swivel base 3 is facing backwards, the operation position of the turning operation lever 5 should be adjusted as described above. Regardless, since the solenoid valves 14 and 18 are in the opposite position, the swivel base 3 passes directly beside the vehicle body 1, the limit switch 2 is turned OFF, and the first relay 7 is deenergized.
Even if the relay contact 8 is turned OFF and the C circuit is opened and no current flows, the limit switch 6 is turned ON on the 8th circuit side by operating the swing operation lever 5, and the second relay 9 is turned on through the 8th circuit. energized, relay contacts 10, 11 .
15 is turned on, circuits B, D, and E are closed and current flows, and solenoid valves 14 and 18 remain in the reverse position.

Even if the swivel base 3 is facing forward, the solenoid valve 14.1
8 is not switched, the steering direction of the traveling remote control valve 13 and the steering switching valve 17 does not match the moving direction of the vehicle body 1.

However, when the swivel base 3 turns from the rear to the front, if the swivel operation lever 5 is returned to the neutral position after passing directly beside the vehicle body 1, the vehicle body 1 and the swivel base 3 described in Section 1 can be rotated. The situation is the same as when both are facing forward, and when the swivel base 3 turns from the front to the rear, if the turning operation lever 5 is returned to the neutral position after passing directly beside the vehicle body 1, the second
This is the same as in the case where the directions of the vehicle body 1 and the swivel base 3 are reversed as described in section 1.

In both the former case and the latter case, the operating direction of the driving remote control valve 13 and the steering switching valve 17 coincides with the moving direction of the vehicle body 1.

As described above, in a hydraulic work vehicle having a driver's seat on a swivel platform, when the driver operates a traveling device or a steering device, the driver can use the driver's seat regardless of the direction of the swivel platform. can be operated centering on the self,
There is no need to consider the relationship between the vehicle body and the swivel table when starting traveling or steering, making driving extremely easy, reducing fatigue, and improving work efficiency.

It is also very convenient because it allows you to make full turns while driving.

[Brief explanation of the drawing]

Fig. 1 is a side view of the embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line - of Fig. 1, Fig. 3 is a diagram showing the relationship between the turning operation lever and the limit switch, and Fig. 4 is a diagram showing the relationship between the turning operation lever and the limit switch. FIG. 5 is an enlarged view of a part of the figure, FIG. 5 is an electric circuit diagram of the present invention, and FIG. 6 is a hydraulic circuit diagram of the traveling device. 1...Car body, 2...Limit switch, 3...Swivel base, 4...Cam, 5...
...Turning operation lever, 6...Limit switch, 7...First relay 8...Relay contact, 9...Second relay, 10...
Relay contact, 11... Relay contact, 12...
...Exciting coil, 13...Remote control valve for driving. 14... Solenoid valve, 15...
Relay contact, 16...Exciting coil, 17...
...Steering switching valve, 18...Solenoid valve, 20...Hydraulic motor for traveling, 21...
...Pilot switching valve for driving, A...
Electric circuit, B: Electric circuit, C: Electric circuit, D: Electric circuit, E: Electric circuit.

Claims (1)

[Scope of Claims] 1. In a vehicle that has a traveling operation lever and a turning operation lever on a swivel base that can make full turns so that it can turn while driving, a limit switch provided on the swivel base and a limit switch provided on the vehicle body are provided. means for detecting the position of the swivel base by a cam; means for detecting the position of the swivel operation lever by a swivel operation lever and a limit switch engaged therewith; a first relay energized by the two limit switches; 1. A steering device for a swing loader, comprising: a second relay energized by one relay; and a solenoid valve for switching a traveling motor hydraulic circuit operated by the second relay. 2. The cam is formed in a semicircular shape and is installed concentrically with the center of rotation of the swivel base on the upper part of the vehicle body, and limit switches that can be engaged with the cam are placed at equal distances from both ends of the cam when the swivel base faces forward. A steering device for a swing loader according to claim 1, which is provided at a certain position. 3 The circuit with the second relay has a self-holding circuit,
A steering device for a swing loader according to claim 1, wherein the circuit having the self-holding circuit and the first relay can be selectively opened and closed by a limit switch that engages the swing operation lever. 4 The first relay turns the swivel base more than 90 degrees left and right from the front, and the limit switch that engages with the cam turns on.
and the steering of the swing loader according to claim 1, wherein the swing operation lever is in the neutral position and is energized only when the limit switch that engages with it is turned on in the first relay side circuit. Device.