JPH0329402Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an excavation body interval width adjustment device in which endless chain type excavation bodies are mounted on the machine frame in two parallel rows on the left and right so that the interval width between them can be adjusted. This invention relates to improvements to a dual-type trencher.

Two endless chain-type excavators are installed on the machine body in parallel on the left and right, and each excavator excavates deep trenches locally in the area where crops are to be cultivated and backfills them. A double trencher, which is used for deep plowing or for harvesting root vegetables by digging deep trenches on the sides of the cultivation rows, is installed in two rows in parallel on the machine frame. There are cases where the width of the distance between the mounted excavators does not match the width of the cultivation rows where the farmer intends to grow crops in the field or the width of the cultivation rows of the crops that are being cultivated.

In order to cope with such a case, it is desirable that the width of the gap between the pair of parallel excavators can be adjusted to expand or contract, and some excavators are made in this way.

However, the conventional excavation body with a spacing width adjustment device 2
In the case of a continuous trencher, as shown in Fig. 1, a drive chain of an endless chain-type excavating body a is fitted to the left and right shaft ends of a drive shaft 1 supported horizontally on a machine frame f. The boss portion 3 of the wheel 2 is connected to the spline groove 1 with respect to the drive shaft 1.
0 in the rotational direction and slidably fitted in the axial direction, and one of the through holes provided in the boss portion 3 and the through holes 1a provided in series in the axial direction in the drive shaft 1... are selected and matched, and a connecting bolt is passed through them to securely fasten them, and the endless chain type excavation body a
A boss portion 40 provided on the frame 4 is slidably fitted into a guide 5 supported on the machine frame f parallel to the drive shaft 1, and a through hole provided in the boss portion 40;
Align the through holes 5a selected from the through holes 5a provided in series in the longitudinal direction of the guide 5, pass the connecting bolts through them, and securely fasten them, and then remove the connecting bolts. By slidingly displacing the boss portion 3 of the drive chain wheel 2 and the boss portion 3 provided on the frame 4 of the excavating body a with respect to the drive shaft 1 and the guide 5, the width of the gap between the pair of excavating bodies a, a can be expanded or contracted. Since the adjustment is made, when the driving chain wheel 2 of the excavating body a is positioned closer to the shaft end side of the drive shaft 1, in order to widen the width of the gap between the pair of excavating bodies a, a on the left and right. The bending moment caused by the tension of the endless chain 20 of the excavating body a during excavation acts strongly on the drive shaft 1, causing a problem that the drive shaft 1 is broken or distorted.

As a practical matter, this bending moment is proportional to the cube of the distance l from the fulcrum, so the strength of the drive shaft 1 is sufficient when the drive chain wheel 2 is located at the position indicated by the chain line in Fig. 1. If it were calculated, displacing the drive chain wheel 2 several degrees outward from that position would create a moment so strong that it would cause the drive shaft 1 to break. It is necessary to make it as thick as a monster, and in reality, it cannot be used as a means to expand or contract the interval between the excavated bodies a, a to match the interval between the desired cultivation rows.

The present invention was developed to solve this problem, and assumes that only the torque for rotating the drive chain wheel fitted to the drive shaft is applied, and no bending moment is applied to the drive shaft.
By making it possible to adjust the displacement of each of the drive chain wheels of the left and right excavation bodies fitted to the drive shaft in the axial direction of the drive shaft, it is possible to adjust the distance between the excavation bodies as desired without causing breakage or distortion of the drive shaft. It is an object of the present invention to provide a double trencher equipped with a device for adjusting the width of the excavation body.

In the present invention, as a means to achieve this objective, an excavating body is equipped with two endless chain type excavating bodies arranged in parallel on the left and right sides on the machine frame so that the width of the interval between the excavating bodies can be adjusted. In a two-chain trencher with a spacing width adjustment device, the boss portions of the drive chain wheels of the excavating body are attached to the left and right shaft ends of the drive shaft supported horizontally on the machine frame in the rotational direction with respect to the drive shaft. A support arm is fitted to the outer peripheral surface of the boss portion via a bearing, and the support arm is mounted on the machine frame parallel to the drive shaft. The present invention proposes a dual trencher with a spacing width adjustment device for an excavation body, characterized in that the excavation body is integrally connected to the frame of the excavation body which is fitted and supported by a guide supported by the excavation body.

Next, an example of implementation will be described in detail with reference to the drawings. In addition,
For the same constituent members, the same reference numerals as in the previous means will be used in the drawings.

Figure 2 shows the machine mounted on the rear of the tractor T.
Fig. 3 shows a side view of the double trencher A in a working state, which is configured to carry out ultra-deep plowing in parts by forming an excavated trench in the field and backfilling the trench. It shows the expanded plane of the main part of A.

In FIGS. 2 and 3 above, f is the machine frame of the double trencher A, on which the gearbox GB is integrally assembled, and the mast 80, which is integrally connected to the machine frame f, is attached to the machine frame of the tractor T. A three-point link consisting of a lower link 81 and a top link 82 is connected to the rear of the fuselage.

Reference numeral 1 denotes a drive shaft that is horizontally supported on the machine frame f, and is supported by the gear box GB so as to pass from side to side through the gear box GB assembled on the machine frame f.
The transmission gear 11 installed in the gearbox GB,
12 to the input shaft 13 which is pivotally supported on the gearbox GB, and the input shaft 13 is connected to the tractor T.
It conducts with the PTO shaft 83 installed at the rear of the aircraft.

Reference numerals 2 and 2 denote driving chain wheels of the endless chain-type excavating bodies a and a that are fitted to the left and right shaft ends of the drive shaft 1, and the boss portion 3 thereof is formed in the shape of a shaft tube long in the axial direction. , spline grooves 1 provided on the inner peripheral surface thereof and spline grooves 1 provided on the outer peripheral surface of each left and right shaft end of the drive shaft 1.
0, it is fitted so that it engages with the drive shaft 1 in the rotational direction and freely slides in the axial direction.

Reference numeral 4 denotes a frame (boom) of the endless chain-type excavating body a, at the tip of which a floating chain ring 41 is pivotally supported, and a stay 4 protruding from the frame 4 in a branch shape.
A wheel 43... is pivotally supported at the tip of the wheel 2. Then, the endless chain 20 is wrapped around the rolling wheels 43..., the floating chain ring 41, and the aforementioned drive chain wheel 2, and the digging blade 21... is attached to the outer peripheral surface of the endless chain 20. It constitutes an excavation body a of the formula.

Reference numeral 40 denotes a boss portion provided on the frame 4 of the excavating body a for displacing the frame 4 of the excavating body a in the axial direction of the drive shaft 1, which is formed separately from the frame 4 and is attached to the machine frame f. It is slidably fitted on the outer circumferential surface of a rod-shaped guide 5 supported in parallel with the drive shaft 1, and is attached to the outer circumferential surface of the boss portion 3 of the drive chain wheel 2 through a bearing 6. The fitted support arm 7 and the connecting bolt 70 are integrally connected to each other, and the support arm 7 is integrally connected to the frame 4, so that the boss portion 40 moves on the guide 5 along its longitudinal direction. By being displaced in the direction, the frame 4 of the excavating body a is displaced along the axial direction of the drive shaft 1. And again, this boss part 40
When the frame 4 of the excavating body a is displaced due to the movement of By displacing the support arm 7 integrally with the frame 4, the boss portion 3 of the drive chain wheel 2 is displaced in the axial direction of the drive shaft 1, thereby displacing the drive chain wheel 2 in the axial direction of the drive shaft 1. I come to do it.

Reference numeral w denotes an operating mechanism for displacing the frame 4 of the excavation body a by moving the boss portion 40, and is integrally connected to the boss portion 40 of each frame 4 of the excavation bodies a, a provided in a pair on the left and right. Screw rods 91, 91 protruding from the sides facing the arms 90, 90, respectively, are fixed to the arms 90, 90 extending rearward, and the screw rods 91, 91 have screws provided with internal threads on the inner peripheral surface. By screwing together the left and right ends of the tube 92 and rotating the screw tube 92 in the forward or reverse direction with a tool such as a wrench, the width of the gap between the pair of arms 90, 90 is expanded or contracted in a turnbuckle shape, and the excavation body a is , a to displace the frames 4, 4. This operating mechanism w is constructed by extending an extendable hydraulic cylinder between the pair of arms 90, 90, and extending and contracting the hydraulic cylinder using a hydraulic device mounted on the body of the tractor T. It may be designed to operate as appropriate.

In addition, 5' is a guide provided on the machine frame f in parallel with the aforementioned guide 5 to prevent rotation of the frame 4 of the excavating body a, and is integrally connected to this by the boss portion 40 and the connecting plate 93. A boss portion 40' is slidably fitted thereto. This guide 5' may be omitted when the aforementioned guide 5 is formed into a prismatic shape.

Moreover, this guide 5' and the above-mentioned guide 5 are
In the embodiment shown in FIGS. 2 to 4 described above, as shown in FIG.
As shown in FIG. 5, the connecting plate 93 is formed into a substantially fan shape extending rearward from the gearbox GB in side view, and the guides 5 and 5' are supported on this. In cases where the drive shaft 1 is supported in parallel in the front and rear, or when the 6th
As shown in the figure, a connecting plate 93 is installed so as to extend rearward from the gearbox GB in a side view, and the guides 5 and 5' are arranged in parallel in front and behind the drive shaft 1. It may be necessary to prop it up.

Further, the boss portion 3 of the drive chain wheel 2 which is connected to the support arm 7 connected to the frame 4 of the excavation body a via the bearing 6 connects the bearing 6 to the drive shaft 1 together with the frame 4 of the excavation body a. On the other hand, it only needs to be displaced in the axial direction, and there are cases where it is formed separately from the boss 2a of the drive chain wheel 2 and joined to the boss 2a so that it can move together.

As explained above, the double trencher with the excavation body interval width adjustment device according to the present invention has a machine frame f
At the left and right shaft ends of the drive shaft 1 which is horizontally supported by A support arm 7 is fitted to the outer peripheral surface of the boss portion 3 via a bearing 6, and a support arm 7 is fitted to the machine frame f parallel to the drive shaft 1. and supported on a guide 5, and the boss portion 40 of the frame 4 of the excavation body a is slidably fitted to the guide 5, and the frame 4 and the support frame 7 are integrally or integrally connected. Therefore, the outer circumferential surface of the boss portion 3 of the drive chain wheel 2 is supported via a bearing 6 by a support arm 7 extending from the frame 4 of the excavation body a that is slidably supported on the guide 5. Therefore, when a tensile stress is applied to the drive chain wheel 2 during the digging operation due to the endless chain 20 that is passed around it, the stress is transferred to the bearing 6 and the support arm 7.
The guide 5 is received via the frame 4 and boss portion 40 of the excavation body a.

Therefore, the drive shaft 1 only needs to be used as the drive chain wheel 2 to transmit rotational torque, and the fulcrum position that receives the stress is the bearing 6 that receives the outer peripheral surface of the boss portion 3 of the drive chain wheel 2. As shown in FIG. 4, the bearing 6 moves together with the displacement of the driving chain wheel 2, and the displacement of the driving chain wheel 2 can be adjusted without changing the fulcrum position. It becomes like this.

Therefore, according to the present invention, the interval between the excavating bodies a, a, which is arranged in two parallel rows on the left and right, can be adjusted as desired without causing breakage or distortion to the drive shaft 1. A double trencher with a width adjustment device is obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional excavator width adjustment means, FIG. 2 is a side view of an embodiment of the device of the present invention, and FIG.
The figure is a partially exploded plan view of the main parts of the same device.
FIG. 4 is an explanatory view of the operation of the main parts of the same device, FIG. 5 is a side view of another embodiment of the device, and FIG. 6 is a side view of still another embodiment of the device. Explanation of drawing symbols, A...Double trencher,
GB...Gearbox, T...Tractor, a...
Excavation body, f...Machine frame, l...Distance, w...Operation mechanism, 1...Drive shaft, 1a...Through hole, 10...Spline groove, 11, 12...Transmission gear, 13...Input Axis, 2... Drive chain wheel, 2a... Boss, 20...
Endless chain, 21...Drilling blade, 3...Boss part, 4...
Frame (boom), 40, 40'...Boss part, 4
1...Floating chain ring, 42...Stay, 43...Rolling wheel, 5, 5'...Guide, 5a...Through hole, 6...
Bearing, 7... Support arm, 70... Connection bolt,
80...Mast, 81...Lower link, 82...
...Top link, 83...PTO shaft, 90...Arm, 91...Threaded rod, 92...Threaded tube, 93...
...Connection plate.

Claims (1)

[Scope of utility model registration request] In a two-chain trencher equipped with an excavator width adjustment device, two endless chain-type excavators a and a are mounted on a machine frame f in parallel on the left and right so that the gap between them can be freely adjusted. The boss portions 3 of the drive chain wheels 2 of the left and right excavation bodies a, a are attached to the left and right shaft ends of the drive shaft 1 which is horizontally supported on the frame f, and are not engaged in the rotational direction with respect to the drive shaft 1. A support arm 7 is fitted onto the outer peripheral surface of the boss portion 3 via a bearing 6, and a support arm 7 is fitted to the machine frame f parallel to the drive shaft 1. The guide 5 is supported, the boss portion 40 of the frame 4 of the excavation body a is slidably fitted to the guide 5, and the frame 4 and the support arm 7 are connected integrally or integrally. This is a two-channel trencher with a feature that adjusts the width of the excavation body.