JPS6015785Y2 - culvert excavation equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an underdrain excavation device used to improve the wetness of rice field soil.

Paddy fields are made up of a tilled layer on the surface, a tiller layer below that, and a core layer below that.

There is a hardened plowing platform in order to obtain appropriate water retention in the plowing layer.
This tiller prevents water from leaking.

If you only grow rice in paddy fields and do not use a second crop, even a small amount of wet rice will not affect the crops, but if you are planning to grow summer crops other than paddy rice or wheat as a second crop, soybeans and barley will be grown in wet fields. It is necessary to deal with this by creating high ridges.

The purpose of the underdrain system is to improve the drainage of such wet rice fields, by tearing up the tiller and opening a drainage hole on the core beneath it.

Conventional culvert excavation equipment installed the culvert parallel to the surface of the rice field, but the present invention attempts to improve the flow of water by sloping the culvert.

Since the culvert is excavated across the entire width of the paddy field, the slope must be gradually increased, necessitating a reduction gear with a large reduction ratio.

In the embodiment of the present invention, the rotation of the gate shaft protruding from the rear of the tractor is used as the rotational driving force, but in order to further increase the reduction ratio, a stepping motor with a low rotation speed may be used.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of a tractor equipped with the culvert excavation device of the present invention.

A culvert excavator is pivotally attached to a three-point link type work equipment mounting device provided on the rear surface of the transmission case of tractor A with a pin or the like.

The top link mast 24 of the culvert excavator is pivotally connected to the top link 28, and the lower links 29, 29 of the tractor are connected to the top link 28.
is pivoted downward.

The internal zero rotation of the PTO shaft 5 is transmitted to the input shaft 22 protruding from the deceleration case 45 via the universal joint 30, and after deceleration, the threaded rod 37 is rotated, and the vertical rod 1 of the tail wheel 1 is rotated.
By rotating c at the pivot point 1d, the operating angle of the tail wheel 1 is changed.

The entire culvert excavation equipment is supported by a lift arm 51 so that it can be raised freely, and during work, the lift arm is in an open state and the entire equipment is supported by the tail wheel 1, and the tail wheel 1 and the chisel 26
, the relative height of the bullet 27 is the depth of the culvert.

Therefore, by changing the working height of the tail wheel by rotating the vertical rod IC of the tail wheel 1, the excavation depth of the underdrain can be changed.

2 and 3 are a side view and a plan view of the speed reducer and threaded rod 37 of the underdrain excavation device shown in FIG. 1.

The rotation of the tractor PTO shaft is transmitted to the input shaft 22, and a first stage of deceleration is performed between a screw gear 44 fixed to the input shaft 22 and a large gear 43 meshing at right angles.

Further, a screw gear 42 is further fixed on the shaft of the large gear 43,
A large gear 40 is further meshed with the screw gear 42 at right angles, and a case 41 is provided so that the large gear 40 can freely rotate around the shaft to which the large gear 43 and the screw gear 42 are fixed.

A screw rod 37 is provided protruding from one surface of the case 41, and the screw rod 37 also serves as the shaft of the large gear 40.

A clutch 37b that is slidable by a spline on the screw rod 37 is provided on the case 40 side of the screw rod.
7b is normally pressed by the bullet 39 and in a clutch engaged state, transmitting the rotation of the large gear 40 to the threaded rod 37.

A stopper 37a with an inclined surface is provided at the right end of the screw rod 37, and the upper side 35 of the sliding body is attached to this stopper 37a.
7a and the sliding body opens upward and downward, thereby stopping the movement of the sliding body.

4 is a bottom view and a side view of the upper side 35 of the sliding body. FIG. 5 is a side view and a top view of the lower side 36 of the sliding body.

The sliding body has a shape in which the upper side 35 and the lower side 36 are combined.

Pins are inserted into the pivot hole 35b on the upper side 35 of the sliding body and the pivot hole 36b on the lower side 36 of the sliding body to make both rotatable, and the bullet 38 is attached to the pins 35a and 36a provided at the other ends of both. It is always combined with a bridge.

When the sliding body moves to the right due to the rotation of the screw rod 37 and reaches the stopper 37a, the upper side of the sliding body is rotated by the inclined surface of the stopper 37a, and the screw rod is released from the screw groove cut inside. , the sliding body is prevented from moving further.

When the sliding body is to be returned, it can be returned by rotating the PTO in the opposite direction.The stopper caused by the reverse rotation is such that the sliding body pushes the clutch 37b, which disengages the clutch from the spline portion and stops the rotation of the threaded rod. It can be stopped.

Since the clutch 37b is pushed by the bullet 39, the clutch engages again if the direction of rotation changes.

If the PTO rotation cannot be reversed, move the sliding body manually to its original position.

When the vertical rod 1c of the tail wheel 1 rotates, the threaded rod 37 is required to rotate up and down, and the deceleration case 45 and the other deceleration case 41 provided on the side of the deceleration case 45 rotate. Since it is movably supported, the screw rod 37
It can also rotate freely.

FIG. 6 is an overall side view of a tractor equipped with another embodiment of the culvert excavation device.

The underdrain excavation device in this embodiment is a vibrating type, and the cam 3
Since the vertical vibration of 3 is transmitted by the horizontal rod 34 and supported by the pivot point 32, the vertical blade 25 vibrates back and forth.

In addition, a forced rotation coulter 23 is installed in a straight line in front of the vertical blade 25.
The ground is cut open and weeds and straw are cut by the forced rotation coulter 23.

7 is a side view of a main part of the tail wheel vertical adjustment device shown in FIG. 6, and FIG. 8 is a plan view of the gear box 21 shown in FIG. 6.

Power entered into the gear box 21 from the input shaft 22 is transmitted from the bevel gear 20 to the bevel gears 18 and 19.

The reversing clutch 52 selectively engages the bevel gear 18 by sliding.
Alternatively, the rotation direction of the shaft 53 is changed by engaging with the shaft 53.

A chain case 14 that transmits power to the forced rotation coulter 23 and a chain case 9 that transmits power to the tail wheel vertical adjustment device are protruded from the end of the shaft 53 outside the gear box.

The rotation of the shaft 53 and the up-down adjustment of the tail wheel are selected by the reversing lever 15, and when the tail wheel has gone up or down, the shifter shaft 16,
The shifter 17 moves and returns the reversing clutch to the neutral position.

A speed reduction device 10 is provided within the gear box 7 and transmits low rotation after deceleration to the screw gear 6.

A large gear 5 meshes with a screw gear 6, and a small diameter gear 4 is fixed coaxially with the large gear 5.

The base of the threaded rod 2 is fitted as the shaft of the large diameter gear 3 that engages with the small diameter gear 4.

By rotating the screw rod 2, the sliding piece 1b with a female thread part
moves up and down, and since the tail wheel vertical rod 1c is fixed to the sliding piece 1b, the tail wheel 1 moves up and down as the screw rod 2 rotates.

An actuating piece 1a projects from a part of the vertical rod 1c, and this actuating piece plays the role of pushing the sensors 11a and 12a of the wires 11 and 12 to return the shifter shaft 16 to the neutral position.

This prevents the tailwheel from moving any further.

13 is the outer cylinder of the tail wheel vertical rod 1c.

In the case of the embodiment shown in FIG. 1, while the sliding body moves one stroke on the threaded rod 37, the tail wheel moves from low to high to low, and the resulting culvert takes on the shape of a hemlock.

In the case of the embodiment shown in FIG. 6, the tail wheel moves high-low or low-high while the sliding piece moves one stroke on the threaded rod 2, and the completed culvert moves in one direction. It becomes a slope.

As described above, in an underdrain excavation device that regulates the excavation depth with a tailwheel, the present invention is designed to gradually change the working height of the tailwheel over the width of the paddy field. By attaching a threaded rod and rotating the threaded rod forward and backward with a drive unit that rotates the screw rod as the excavation work is carried out, the vertical rod I
By moving C, the relative position of the chisel 26 and the tailwheel 1 is changed, so that the completed culvert has a continuous straight slope and is not stepped, so that it does not leak from the tiller. This allows the water to flow smoothly without stagnation in the culvert, increasing drainage effectiveness.

In addition, as in Utility Model Application No. 54-43232, the vertical rods are not manually adjusted each time after getting off the tractor, so the operation is easy and work efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a tractor equipped with the culvert excavation device of the present invention, Fig. 2 is a side view of the tail wheel adjustment device of the culvert excavation device shown in Fig. 1, and Fig. 3 is a plan view of the same. 4 is a bottom view and a side view showing the upper side of the sliding body, and FIG. 5 is a side view and a top view showing the upper side of the sliding body. Fig. 6 is an overall side view of a tractor equipped with another embodiment of the culvert excavation device, Fig. 7 is a side view showing the main parts of the tail wheel vertical adjustment device shown in Fig. 6, and Fig. 8 is the same as that shown in Fig. 6. FIG. 3 is a plan view of the gearbox. A: Tractor, B: Cultivated layer, C
・・・・・・Plowing plate, D・・・・・・Upper core, 1・・・・・・
・Tail wheel, 2, 37... Screw rod, 25...
・Vertical blade, 26...chisel, 27...bullet.

Claims (1)

[Scope of utility model registration request] In an underdrain excavation device that regulates the excavation depth with a tailwheel, a threaded rod is attached to the vertical rod IC part of the tailwheel 1 in order to gradually change the working height of the tailwheel over the width of the paddy field. The chisel 2 is moved by moving the vertical rod IC by rotating the screw rod forward and backward with the drive unit that rotates the screw rod as the excavation work is performed.
An underdrain excavation device characterized in that the relative positions of the tail wheel 1 and the tail wheel 1 are changed.