JPH0521478Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is applicable to dump trucks, power shovels,
This invention relates to a Betsu cell inclination angle control device for construction machinery such as wheel loaders and high-altitude work places.

(Prior art) A conventional example of a dump truck is explained below.
When the dump operating lever located on the driver's seat is operated to the tilting operating position (raise), the vehicle (dump loading platform) is tilted upward significantly via the hydraulic drive circuit, that is, dumped, and the lever is switched to the neutral position. When it returns to normal position, the tilting of the Betsu cell is stopped, and the lever is operated in the opposite direction to lower the Betsu cell and operate it horizontally.
The driver must be careful of the rear upper part when dumping (tilting) the Vetsu cell upwards, and does so under the direction of the onlooker if necessary.

(Problem to be solved by the invention) The conventional dump truck has a structure in which a driver gets on board and greatly dumps (tilts) the vehicle upwards. If the vehicle cannot be tilted to its maximum height due to the relationship between There are problems such as the

The present invention was developed to address the above-mentioned problems, and its purpose is to:
By setting the tilt angle of the Bethel, when the Bethel reaches the set angle, the lever for tilting operation automatically returns from the tilting operation position to the neutral position, making it possible to automatically control the tilting angle of the Bethel, improving the tilting operation performance of the Bethel, and improving work efficiency. An object of the present invention is to provide a batsel inclination angle control device for construction machinery with improved construction machinery.

(Means for Solving the Problems) The present invention provides a lever for tilting the vessel of a construction machine, and a cylinder for setting the vessel tilt angle for returning the lever from the tilting operation position to the neutral position, and A vessel tilt angle setting control mechanism is provided, which includes a cylinder actuating solenoid valve interposed in the cylinder's operating conduit, and a limit switch that is connected to the vessel and switches and controls the solenoid valve when the vessel reaches a set tilt angle. It has a unique structure, when during tilt operation of the Betsu cell, when the Betsu cell reaches the set angle, the limit switch switches and controls the solenoid valve for cylinder operation, and the actuating pipe operates the setting cylinder to operate the lever. It automatically returns from the position to the neutral position, and automatically stops and fixes the Bethel at the set angle.

(Function) When the Betsu cell tilt operation lever is operated to the tilt operation position, the Betsu cell is tilted. When the Betsu cell reaches the set angle, the solenoid valve for cylinder operation is switched and controlled by the limit switch, and the actuation pipe is used to control the setting angle. The cylinder is actuated and the lever is automatically returned from the tilting operation position to the neutral position, and the vessel is stopped and fixed at the set angle.

By setting the set angle, the tilt angle of the vessel is automatically controlled to a desired angle.

(Embodiment) An embodiment of the present invention is shown in the attached drawings, in which 1 is a vehicle (loading platform) which is pivotally mounted 3 on the body frame 2 of a construction machine such as a dump truck and is arranged to be tiltable upward. , 5 is a lever disposed in the driver's seat of the vehicle body for tilting (dumping) the vessel 1 via an appropriate hydraulic drive circuit (not shown), which is tilted to the lever 5 for tilting the vessel 1 of the construction machine. A cylinder 6 for setting the Betsuel inclination angle that returns the same lever 5 in the operating position 5b to the neutral position 5a is provided oppositely, and a solenoid valve 8 for cylinder operation interposed in the actuation conduit 7 of the setting cylinder 6, The vessel inclination angle control device for construction machinery is provided with a vessel inclination angle setting control mechanism consisting of a limit switch 9 which is connected to the vessel 1 and switches and controls the electromagnetic valve 8 when the vessel reaches a set inclination angle.

The lever 5 is disposed in the driver's seat and tilts the vessel 1 upward via an appropriate hydraulic drive circuit (not shown), and is located at a tilting operation position 5b.
When the operation is performed in the opposite direction, the Bethel 1 is tilted significantly upwards around the pivot 3, and when it is switched to the neutral position 5a and returned, the tilting of the Bethel 1 is stopped and fixed, and when it is switched in the opposite direction, the Bethel 1 is lowered. Becomes horizontal.

The setting cylinder 6 has a cylinder rod 11 that is fixedly installed on a bracket 10 and is biased by a return spring 12.The tip end 11a of the cylinder rod 11 comes into contact with the lever 5 at the tilting operation position 5b, and the cylinder rod is rotated. 11 is extended against the spring bias to return the lever 5 to the neutral position 5a, and a cylinder actuating solenoid valve 8 is interposed in the actuating conduit 7 of the setting cylinder 6 to connect the pressure air supply source 13.
When the cylinder operating solenoid valve 8 is switched and controlled to open the operating pipe 7, the pressure air supply source 13 supplies pressurized air to the setting cylinder 6 through the operating pipe 7, and the setting cylinder 6 is activated. The lever 5 is moved to the neutral position 5 by the extension of the cylinder rod 11.
It returns to position a, and the tilting of the Bethel 1 is stopped and fixed.

The limit switch 9 is disposed on the vehicle body frame 2 and is connected to the vehicle body frame 2 via an operating member 14 provided on the vessel 1. When the vessel 1 is tilted as shown in the figure and reaches a desired set tilt angle, the operating member 14 is connected to the vehicle body frame 2.
The valve is closed and turned on to switch and control the cylinder actuating solenoid valve 8 to the pipe opening side, and the set inclination angle of the vessel 1 is changed and adjusted depending on the placement position of the limit switch a.

Further, a manual switch 15 is interposed between the limit switch 9 and the cylinder operating solenoid valve 8, and when the manual switch 15 is turned on, the tilt angle of the vessel 1 is controlled, and when the manual switch 15 is turned off, the tilt angle is controlled. The control is inactive, and when the control is inactive, the angle of inclination of the vessel 1 can be freely controlled by operating the lever 5.

The embodiment of the present invention has the above-mentioned structure, and its operation will be explained in detail by the manual switch 15.
When the lever 5 is turned on and the lever 5 is operated to the tilt operation position 5b, the Vessel 1 is tilted upward around the pivot 3 part by an appropriate hydraulic drive circuit (not shown), and the Vessel 1 reaches the set tilt angle. Then, the limit switch 9 is closed and turned on by the operating member 14, and the cylinder operating solenoid valve 8 is switched from the illustrated position, and pressure is supplied from the pressure air supply source 13 to the setting cylinder 6 via the operating pipe 7. That is, the cylinder rod 11 extends against the spring force, automatically returning the lever 5 from the tilt operation position 5b to the neutral position 5a, and the vessel 1 is stopped and fixed at the set tilt angle.

When the lever 5 is moved to the lower operating position in the opposite direction, the cylinder actuating solenoid valve 8 is automatically switched and returned, the actuating pipe 7 is opened to the outside air, and the operating pressure in the setting cylinder 6 is discharged to the outside air. The piston rod 11 is shortened by the spring bias 12, and the lever 5 can be operated to the tilting operation position 5b. It is changed and adjusted to a desired value by the switching timing of 8.

When the manual switch 15 is turned off, the automatic control of the vessel inclination angle is disabled, and the vessel 1 can be operated in the same manner as before.

In the above-mentioned embodiment, the loading platform (vessel) of a dump truck was described, but the present invention can also be applied to a vehicle such as a bucket cart of a power shovel, a bucket cart of a wheel loader, or a work platform of an aerial work vehicle.

(Effects of the invention) The present invention has the above-mentioned configuration, and when the lever for tilting the vessel is set to the tilting operation position and the vessel is tilted, the limit switch activates the electromagnetic force for cylinder operation when the vessel reaches the set angle. The valve is switched and controlled, the setting cylinder is actuated by the actuating conduit, the lever is automatically returned from the tilt operation position to the neutral position, and the Betsu cell is stopped and fixed at the set angle. is automatically controlled to the desired tilt angle, significantly improving tilting operation performance and work efficiency.

[Brief explanation of drawings]

The attached drawing is a mechanical diagram showing one embodiment of the present invention. 1... Betsu cell, 5... Lever, 6... Setting cylinder, 7... Actuation pipe, 9... Limit switch, 8... Betu cell operation solenoid valve.

Claims (1)

[Scope of utility model registration request] A cylinder for setting the tilt angle of the Betsu cell for returning the lever from the tilting operation position to the neutral position is provided opposite to the lever for tilting the Betsu cell of the construction machine, and an electromagnetic cylinder for actuating the cylinder is interposed in the actuating conduit of the setting cylinder. A Betsu cell inclination angle control device for construction machinery, comprising a Betsu cell inclination angle setting control mechanism consisting of a valve and a limit switch that is connected to the Betu cell and switches and controls the electromagnetic valve when the Betu cell reaches a set inclination angle. .