JPS587769B2 - Mizohori equipment lifting control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lift control device for a trenching device such as a torrenteer or a digging screw, which is provided to be able to rise and fall with respect to a towing vehicle body.

The bottom of a ditch opened by a ditch digging device is sometimes used as a drainage ditch, but since the ditch digging device follows the vertical movement of the towing vehicle body due to irregularities in the soil surface, an uneven surface is formed at the bottom of the open ditch, impairing drainage performance. do.

This invention solves the above-mentioned drawbacks and takes the following technical measures.

That is, a groove digging device 2 is connected to the towing vehicle body 1 via a hydraulic lifting device so as to be movable up and down, and an open groove excavated by the groove digging device 2 is provided at the rear of the lower end of the groove digging device 2. A sensing body 3 is provided to sense vertical displacement of the soil while sliding on the reference plane A at the bottom, and the hydraulic lifting device is controlled so that the trenching device 2 excavates along the reference plane A. The valve 14 and the sensing body 3 are connected to each other via an interlocking device to form an elevation control device for a groove honing device.

An embodiment of this invention will be described based on the drawings.

The groove digging device 2 (in the illustrated example, it is a trencher in which digging claws 5, 5, etc. are arranged at appropriate intervals on an endless tie 4) has a top link 6 of the same length and a top link 6 of the same length at the rear of the towing vehicle body 1. They are connected to be movable up and down by a parallel link consisting of a lower link 7.7.

The lower links 7, 7 are connected to lift arms 9, 9 at the rear of the towing vehicle body 1 via lift rods 8, 8.

The lift arms 9, 9 are interlocked and connected to a piston 11 that is slidable within the cylinder 10, and are moved up and down by supplying and discharging hydraulic oil to the front and back of the piston 11 within the cylinder 10.

A cover 12 that covers the rear surface of the endless tenn 4 of the trench moat device 2;
A drum-shaped sensing body 3 is provided on the lower end side so as to be freely movable up and down and slides into contact with the bottom opening of the open groove via a support rod 13, and the support rod 13 and the supply and discharge of hydraulic oil into the cylinder 10 are controlled. A connecting rod 16 that can be freely pushed and pulled with the operating lever 15 of the control valve 14 to be controlled, and a rotating arm rod 17 connected thereto.
When the lower end of the trench digging device 2, that is, the lower end of the endless tie 4 is on the reference plane A (horizontal plane in the example shown) that includes the grounding part of the sensor 3, the lift arms 9, 9 are Control valve maintained in position 14. If the lower end of the endless chain 4 is in the neutral position than this reference plane A, the control valve 14 will be operated to rotate the lift arms 9, 9 upwardly, and conversely, if it is in the upper position, the control valve 14 will be rotated downwardly. Control valve 14 is configured to operate.

Pin 1 connecting the operating lever 15 and the rotating arm rod 17
Reference numeral 8 is detachably provided, and by separating the rotating arm rod 17 from the operating lever 15, the control valve 14 can be operated using only the operating lever 15.

Reference numeral 19 denotes a fixing mechanism for fixing the pushing and pulling action of the connecting rod 16. A bolt 21 is screwed into the rotating piece through which the connecting rod 16 can slide freely, and the connecting rod 16 is fixed or unfixed with the end face of the bolt 21. It is configured as much as possible.

The support shaft 22 that supports the rotary piece 20 is fixed to the machine frame of the ditch digging device 2 or the towing vehicle body 1.

In addition, 23 is a universal joint shaft that interlocks and connects the PTO shaft on the towing vehicle body 1 side and the input shaft on the trenching device 2 side, and 2'4 is the trenching pawl 5, 5...
It is a transport spiral that guides the soil being scooped up laterally across the trench.

The operation of the above example will be explained.

When starting trenching work, the operating lever 15 and the rotating arm rod 17 are separated and the operating lever 15 is operated to lower the trenching device 2 to a desired depth.

After this, the towing vehicle body 1 is moved forward to open the groove, but the rotating arm rod 1
7 and the operating lever 15, the control valve 14 is actuated by vertical movement of the sensing body 3 relative to the groove digging device 2.

That is, if the groove digging device 2 moves up and down due to the tilting of the towing vehicle body 1, etc., and the lower end of the groove digging device 2 moves below the reference plane A (horizontal plane) including the ground contact portion of the sensing body 3, the connecting rod will move as appropriate. 16. The operating lever 15 is rotated via the rotating arm rod 17, the control valve 14 is operated, and the lift arms 9 are rotated upwardly or downwardly, and the lower end of the groove digging device 2 and the sensing body 3 are grounded. Change the posture so that the part is aligned with the reference plane A.

Therefore, the bottom opening of the open groove is formed along this reference plane A.

Drainage pipes or fir shells are laid or inserted at the bottom of the open ditch to form a drainage culvert, and the bottom of the open ditch is formed on a horizontal surface with few irregularities and good drainage.

In this embodiment, a fixing mechanism 19 is provided in the middle of the connecting rod 16, and if the fixing mechanism 1.9 is used to fix the sensing body 3 in either the upper or lower position from the horizontal plane, the excavation will be completed from the starting position. An open groove bottom is obtained between the positions at a predetermined angle with respect to the horizontal plane, and drainage performance is even better.

In this case, it is preferable to provide a constriction part in the hydraulic oil supply pipe to the cylinder 10 and gradually rotate the lift arms 9 upward and downward.

Further, the reference plane A may be not only a horizontal plane as in the embodiment, but also an inclined plane having an appropriate angle with respect to the horizontal plane, thereby improving drainage performance.

Since this invention has the above configuration, it has the following technical effects.

In other words, the groove digging device is automatically controlled to move up and down so that the lower end of the trench is always along a predetermined reference plane regardless of the vertical movement of the towing vehicle body, and the bottom surface of the open groove formed by the groove digging device is This results in less unevenness along the reference plane, resulting in better drainage.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a partially enlarged view thereof. In the figure, 1 is a towing vehicle body, 2 is a ditching device, 3 is a sensing body, and 9.
9 is a lift arm, 14 is a control valve, 15 is an operating lever, 16 is a connecting rod, 17 is a rotating arm rod, A is a reference plane, and the opening is an open groove bottom.

Claims (1)

[Claims] 1. A groove digging device is connected to the towing vehicle body via a hydraulic lifting device so as to be movable up and down, and at the rear of the lower digging end of the groove digging device,
A sensing body is provided that senses the vertical displacement of the soil while sliding on the reference plane of the bottom of the open trench excavated by the trench digging device,
An elevation control device for a trench trenching device, comprising a control valve of the hydraulic lifting device and a sensing body connected via an interlocking device so that the trench trenching device excavates along the reference plane.