JPS58143025A - Driver for shovel working machine - Google Patents

Abstract

PURPOSE:To suppress the change in the revolving speeds of a bucket as well as to raise its operability by a method in which the stroke of a fluid-pressure cylinder to drive and revolve a bucket is detected, and based on the detected output the supply of fluid pressure to the fluid-pressure cylinder is controlled. CONSTITUTION:A fluid-pressure cylinder 7 is connected through an unequal quadrilateral link mechanism in an interlocking manner to a bucket. Also, a sensor 11 to detect the stroke of the cylinder 7 is provided, and the output is put in a controller 12. The controller 12 controls a three-position control valve 17 provided between a reciprocal cylinder 15 for operating a pump and an auxiliary pump 16 and makes the revolving speed of the bucket constant in relation to the stroke of the fluid-pressure cylinder 7.

Description

DETAILED DESCRIPTION OF THE INVENTION In order to widen the working rotation angle range with the bucket, the present invention interlocks and connects a fluid pressure cylinder to the bucket (K) via a scalene rotation linter mechanism. The present invention relates to a driving device for a seapel working machine configured such that the swing angle of the packet is larger than the swing angle of the swing link on the V/close side.

Conventionally, this type of S/N bell working machine uses a scalene link mechanism, so as shown in Fig. (The rotational speed of the kerat increases more widely and at a larger rate of change at both ends than at the middle of its rotation range, making the packet difficult to operate and restricting the rotation range.) The purpose of the present invention is to overcome the above-mentioned conventional methods, which have been rumored to have the disadvantage of causing dirt to spill when the packet stops rotating, causing soil to spill, and causing vibrations in the aircraft that are unpleasant to the operator. In view of the actual situation, while taking advantage of the interlocking mechanism between the packet and the fluid pressure cylinder through the scalene link mechanism,

It is possible to improve the above-mentioned drawbacks due to changes in rotational speed.

The characteristic configuration of the present invention is to provide a sensor that detects the stroke of a fluid pressure cylinder that drives and rotates the packet, and to suppress the flow rate supplied to the cylinder based on information from the sensor due to changes in the rotational speed of the packet. A flow control device is provided to increase and decrease the flow rate.

The functions and effects of the characteristic configuration of the present invention are as follows.

Packet fluid pressure cylinders are interlocked and connected by a scalene link mechanism, and although the working rotation angle range of the packet is greatly cut, the rotation speed of the packet can be controlled by controlling the supply amount to the fluid pressure cylinder. It is best to keep it constant or to control it so that it changes gradually as shown in Figure 8. This will improve the operability of the packet and reduce the risk of death, and when the packet stops rotating due to rotation range regulation. Since it is possible to alleviate the ¥3 damage caused by the $11 ivy packet, it is possible to effectively suppress the vibration of the aircraft during soil crushing from the packet, and the overall V! It has now become possible to improve the work efficiency of bevel industry machines.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.
, a swivel table (3) is provided that can be driven and rotated freely with a vertical axis of 1 m, an excavation device (4) is mounted on the front part of the w1 rotation table (3), a prime mover part (6) is mounted on the rear part, and both of the above-mentioned A control section is placed between them, and the excavation device (4) is connected to a paper stand (4m) and a poom (4b), a poom (4b) and an arm (4c), and an arm (4c) and a pipette (4d). and are connected to each other via a large body pressure cylinder (1) so as to be freely driven and swingable,
This constitutes a work vehicle for carrying out excavation work and soil removal work.

In order to drive and rotate the IINIB packet (4d) with respect to the arm (4c), in order to increase the working rotation angle range of the bucket (4d), the fluid pressure V cylinder (7 ), the scalene link mechanism (with a ship interposed, the rotation angle of the packet ()) is larger than the rotation angle of the cylinder (7) @ h moving link (8a). In addition, the fluid pressure cylinder (ma)
is connected to a variable displacement pump via an operating valve, and the rotating speed of the packet (7) can be adjusted by changing the discharge amount of the pump (9).

To change and adjust the discharge amount of the variable displacement pump (9), a variable resistance type stroke [
8 sensors (the river, the sensor movable ff1i (ll
a) f It is installed in conjunction with the piston (γa) of the cylinder (1), and a double-acting yy-mechanism for pump operation;
A microcomputer control valve η, which is interposed between it and the auxiliary bonder, is controlled based on information from the sensor (■), and this controls the stroke of the fluid pressure cylinder ()). On the other hand, the rotating speed of the packet (4d) is made constant, or
It is configured to change and adjust the discharge amount of the variable capacity bonder (9) by adjusting the expansion/contraction amount of the double-acting cylinder (+@) so that the rotational speed of the packet (4d) changes as desired. , to operate the control valve η when the controller is turned on, you can open and close the control valve (1'6) using a pulse signal, or adjust the time of the opening/closing operation signal. The amount of expansion and contraction of the reciprocating cylinder III is set depending on the time of the signal and the time of the signal.

Next, another embodiment will be described.

To detect the stroke of the ν cylinder (1), instead of the variable resistance type stroke detection sensor (11), a differential transformer type or a nitrogen pressure type using a bellows or diaphragm is used. Various configuration changes are possible, such as using a detection sensor, and the configuration for detecting the stroke of the cylinder (7) is collectively referred to as a sensor (11).

To operate the variable displacement type bonder (9), a drive device such as an electric motor is linked to the variable displacement type bonder (9) operating section in place of the fluid pressure double-acting cylinder fJ@, and control 110! Various configuration changes are possible, such as automatic operation using IK.

The signal from the sensor (11) causes the fluid pressure cylinder (
It is possible to change the configuration of each i1, such as automatically operating a flow rate regulating valve such as a tie box installed in the pressure fluid supply path to 1) by the controller Oy4, and based on the signal from the sensor 0, The device that changes and adjusts the flow rate supplied to the cylinder (1) is collectively referred to as a flow rate control device.

The drive device according to the present invention can be used for various types of vehicles such as backhoe work vehicles.
Can be applied to horizontal work equipment.

[Brief explanation of drawings]

The drawings illustrate an embodiment and a conventional example of the drive device for an excavator working machine according to the present invention, in which Fig. 1 is an overall side view of a pack hoe working vehicle, Fig. 3 is a hydraulic pressure and control circuit diagram, and Fig. 3 is a packet circuit diagram. A diagram showing the relationship between dynamic speed and yy stroke amount,
Fig. 4 is a diagram showing the relationship between the packet rotation speed and the V'' ring stroke amount in the conventional case. -----Fuless side link mechanism, (1
1) --- Sensor.

Claims (1)

[Claims] Bucket) (4d) with scalene linkage mechanism (%
The fluid pressure V9 cylinder (7) is interlocked and connected through the cylinder [7111] so that the swing angle of the packet C4-) becomes larger than the swing angle of the swing link (8 m) of the cylinder [7111]. The drive device for the cylinder working machine is provided with a sensor (0) for detecting the stroke of the cylinder (1), and a sensor (II) that detects the stroke of the cylinder (1). (4d)
A drive device for a VH working machine, characterized in that it is provided with a flow control device that increases and decreases the flow rate so as to suppress changes in rotational speed.