JPS5923074Y2 - culvert excavation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that is attached to, for example, a tractor, and is towed with an excavation beam that forms an underdrain plunged into the soil to form an underdrain for draining and ventilating a field.

Conventionally, there was a technology in which a rotary cutting blade was installed on the front side of the excavation beam, but the cutting blade collided with trees in the soil, or grass and straw wrapped around the cutting blade, causing damage to the cutting blade and its drive. There was a problem with damaging the system.

The present invention addresses the above-mentioned problems, and includes a device in which a culvert excavation work machine having an excavation beam is mounted on a tractor so that it can be raised and lowered via a hydraulic lifting device, and the rotary cutting blade on the front side of the excavation beam is controlled to drive. Equipped with a safety clutch to
A power disconnection detection switch is provided that operates the hydraulic lifting device upward in conjunction with a power cutting operation of the clutch due to overload, and a power transmission detection switch that operates the hydraulic lifting device downward in conjunction with release of the overload of the clutch. A switch is provided, and the underdrain excavation machine can be controlled up and down through the switches according to changes in the load on the cutting blade, and the cutting blade can be moved to avoid damage such as 100 trees in the soil. It is an object of the present invention to provide an underdrain excavation device that can prevent the above-mentioned problems and continuously excavate the underdrain below the set load by the safety clutch.

Embodiments of the present invention will be described in detail below based on the drawings.

Fig. 1 is a schematic side view of the entire tractor showing how it is used. In the figure, 1 is an agricultural tractor, 2 is its engine, 3 is a transmission case, 4 is a steering wheel, 5 is a driver's seat, 6 is a front wheel, and 7 is an agricultural tractor.
1 is a rear wheel, 8 is a rear axle, 9 is a PTO shaft, 10 is a hydraulic lifting device, 11 is a lift arm, 12 is a lower link, and 13 is a top link.
A culvert excavation working machine 14 is installed so as to be movable up and down via a culvert 13.

2 is a side view of the working machine 14, and FIG. 3 is a front view thereof. In the figure, 15 is a main frame that extends back and forth, and 16 is a horizontal shaft 17 attached to the front end of the main frame 15.
The lower link 12 is fixed via the pin 18.
19 is a front frame that is installed upright on the side frame 16 and connects the top link 13 via a pin 20; 21 is a front frame that connects each of the frames 15.1
9, a brace frame constructed between 9 and 22, the horizontal shaft 17;
24 is a drum-shaped tail wheel, and 25 is a support leg that is attached to a receiver tube 23 provided in the main frame 15 so as to be adjustable in wheel width.
The support rod 27 is attached to the main frame 15 so as to be swingable via the pivot point 28 at the rear end, and the support rod 29 is attached to the swing rod 27 so as to be adjustable in height. An excavation beam 30 is formed at the lower end of the excavation beam 29 and plunges into the subsoil layer 32 below the plow bed layer 31 of the field; 33 is the rear of the excavation 30; A bullet body 36 is movably connected to the soil via a hook member 34 and forms a culvert 35 in the subsoil layer 32, and is provided at a position in front of the excavation beam 29 to cut through the soil material 37 of the field. a rotary cutting blade forming a cutting groove 38, 3
Reference numeral 9 denotes a gear box which is provided with an input shaft 41 connected to the PTO shaft 9 via a transmission shaft 40 and is fixed to the main frame 15, and 42 is a transmission case which is attached to the gear box 39 and supports the cutting blade 36. The peripheral rear part of the cutting blade 36 is brought very close to the front end of the excavation beam 29, and the front end of the beam 29 is used as a receiving blade to cut foreign matter such as straw with the cutting blade 36, so that the straw etc. is wrapped around the excavation beam 29. It is formed to prevent it from sticking.

As shown in FIG. 4, an eccentric rotating cam 44 is provided on the vibration output shaft 43 interlockingly connected to the human power shaft 41, and a vibration assisting spring 4
5, the swinging rod 27 is brought into contact with the cam 44,
An excavation beam 29 supported by the swinging rod 27 is formed so as to swing back and forth (in the direction of travel).

As shown in FIG. 5, a cutting output shaft 48 is interlocked with the input shaft 41 via bevel gears 46, 47, and the cutting blade 36 is connected to the input shaft 41 via a sprocket 49.50 built in the transmission case 42 and a chain 51. By connecting the output shaft 48 to the support shaft 52 and interposing a safety clutch 53 between the sprocket 50 and the support shaft 52, the cutting blade 36 comes into contact with hard foreign objects such as stones and wood chips in the soil. , the power transmission of the safety clutch 53 is interrupted due to the overload of the cutting blade 36, and the cutting blade 36 is formed to stop.

As shown in FIG. 6, the safety clutch 53 includes a drive-side clutch pawl 54 formed on a sprocket 50 that is rotatably supported on the support shaft 52, and a sliding clutch pawl 54 that is engaged and pivotally supported on the support shaft 52 via a key 55. a driven side clutch pawl 57 formed on the driving wheel 56;
The clutch pawls 54 and 57 are provided with a spring 58 that engages and maintains the clutch pawls 54 and 57.
6 moves against the spring 58, and each clutch pawl 54
．． 57 is formed so that it can be detached.

The hydraulic lifting device 10 of the tractor 1 also includes a hydraulic cylinder 59 that rotates the lift arm 11 up and down, and a hydraulic switching valve 60 that controls the supply of hydraulic oil to the cylinder 59.
, a manually operated lift lever 62 connected to the operating shaft 61 of the switching valve 60, and a link 6 connected to the operating shaft 61.
first and second slide plates 66 connected to the piston rods 3 through long holes 64 and pins 65; and first and second piston rods 71 and 72 connected to the slide plates 66 through long holes 67 and 68 and pins 69 and 70, respectively. It is equipped with hydraulic cylinders 73 and 74 and first and second electromagnetic switching valves 76 and 77 that control the supply of working pressure oil of a hydraulic pump 75 to each cylinder 73 and 74, respectively. While the lift arm 11 can be rotated up and down regardless of .74, when the lift arm 11 is lowered as shown in FIG. Then, when the lift arm 11 is rotated upward and the lift arm 11 is rising,
The second hydraulic cylinder 74 is operated to rotate the lift arm 11 downward via the slide plate 66 in the same manner as described above.

Further, a lower limit switch 78 that is turned off when the lift arm 11 is lowered, an upper limit switch 79 that is turned off when the lift arm 11 is raised, and a shift fork 80 that is connected to the sliding wheel 56 of the safety clutch 53.
A power cutoff detection switch 81 and a power transmission detection switch 82 which are turned on by
The relay 83, the power cutoff detection switch 81, the solenoid 84 of the first switching valve 76 and the upper limit switch 79 are incorporated, and the normally open switch 85 of the relay 83 and the power transmission switch 8 are incorporated.
2 and the solenoid 86 of the second switching valve 77 and the lower limit switch 78, and the relay 83 and this self-holding switch 8.
7 and a lower limit switch 78 are electrically connected in series to a power source 88, respectively.

The present invention is constructed as described above, and the P of the agricultural tractor 1 is
While rotating the cutting blade 36 via the TO shaft 9,
When the excavation beam 29 is rocked and vibrated, the tractor 1 is moved forward, and the underdrain excavation machine 14 is suspended, the cutting blade 36 cuts the soil layer 37 in the field to form a kerf 38. At the same time, the middle of the excavation beam 29 is plunged into the excavation beam 29 , and the excavation 30 of the beam 29 is oscillated back and forth to drive it into the subsoil layer 32 , and the excavation 30 and the projectile body 33 form a culvert 35 in the subsoil layer 32 . The straw, weeds, etc. in the field that are caught in the cutting blade 36 are cut between the peripheral rear part of the cutting blade 36 and the front end of the excavation beam 29.

In addition, the cutting blade 36 can be used to cut hard foreign objects such as stones and wood chips in the soil.
When the safety clutch 53 comes into contact with the cutting blade 36, the safety clutch 53 disconnects and the cutting blade 36
At this time, the sliding wheel 56 moves backward against the spring 58, the clutch pawls 54 and 57 are separated, the shift fork 80 is displaced, and the power disconnection detection switch 81
is turned on, the solenoid 84 is energized, the switching valve 76 is operated, the switching valve 61 is operated by the first hydraulic cylinder 73 via the slide plate 66 and the link 63, and the lift arm 11 is rotated upward. The relay 83 is self-held through the lower limit switch 78 and the self-holding switch 87, which are turned on at the same time, and the normally open switch 85 is kept on.

As described above, the lift arm 11 is rotated upward and the cutting blade 36 is raised together with the working machine 14. When the cutting blade 36 is released from the hard foreign material that stopped the cutting blade 36, the safety clutch 53 returns and the cutting is performed again. At the same time as rotating the blade 36,
The shift fork 80 returns and the power transmission detection switch 8
2 is turned on, the solenoid 86 is energized, and the second switching valve 7 is turned on.
7 is activated, the switching valve 60 is operated by the second hydraulic cylinder 74 via the slide plate 66 and the link 63, the knot arm 11 is rotated downward, and the cutting blade 36 is lowered together with the working machine 14, thereby forming the underdrain 35. At the same time, the lower limit switch 78 is turned off due to the lowering of the lift arm 11, and the relay 83 and solenoid 86 are turned off.

Further, when a piece of wood or the like is caught between the excavation beam 29 and the cutting blade 36, the safety clutch 53 is disengaged and the cutting blade 36 is stopped in the same manner as above, and the work machine 14 is lifted via the lift arm 11. However, if the piece of wood does not come off at this time and the cutting blade 36 continues to be in a stopped state, the lift arm 11 further lifts the work implement 14, and with the excavation beam 29 pulled out of the soil, the lift arm 11 This turns off the upper limit switch 79 and returns the first switching valve 76 to maintain the work implement 14 in the raised position.

Furthermore, FIGS. 7 to 9 show other embodiments.

As shown in FIG.
A safety clutch 53' is interposed between the
This can also be done to prevent damage to the cutting blade 36, chain 51, etc.

As shown in FIG. 8, the cutting blade 36 is rotatably supported on the support shaft 52 via a bearing 90, and a friction clutch 91 is interposed between the support shaft 52 and the cutting blade 36, and the friction clutch 91 is connected to a safety clutch. It is also possible to use the bearing 90 as a safety clutch, as shown in FIG. 9, by engaging the bearing 90 with the support shaft 52 by a shaft pin 92 that is disconnected by a load above a certain level. When the cutting blade 36 comes into contact with a stone, tree root, etc., the cutting blade 36 can be stopped via the clutch 91 or the shaft pin 92.

Note that it is also possible to easily avoid stones, tree roots, etc. by raising and lowering the transmission case 42 using the cutting output shaft 48 as a fulcrum and raising and lowering only the cutting blade 36.

As shown in the embodiments described above, the present invention provides an underdrain excavating machine 14 having an excavating beam 29 to a truck 1 and a hydraulic lifting device 10.
The apparatus is equipped with a safety clutch 53, 53' that drives and controls the rotary cutting blade 36 on the front side of the excavation beam 29, and is equipped with a safety clutch 53, 53' that can be freely raised and lowered through the excavation beam 29.
3. A power disconnection detection switch 81 is provided that operates the hydraulic lifting device 10 upward in conjunction with the operation of the power cutting blade of 53', and also operates the hydraulic lifting device 10 in conjunction with the overload release of the clutches 53 and 53'. A power transmission detection switch 82 is provided to lower the cutting blade 36.
The underdrain excavation working machine 14 can be controlled up and down through the switches 81 and 82 according to load changes, and the cutting blade 36 can be moved to avoid damage such as 100 trees in the soil, and this damage can be prevented. 53.53' can be formed continuously under the load set by 53.53', and has practical effects such as being able to carry out excavation work much more safely and efficiently than in the past.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of an embodiment of the present invention in a working state, Fig. 2 is an enlarged side view of its essential parts, Fig. 3 is a front view of the same, and Figs. 4 and 5 are partial explanatory views. , Figure 6 is the operation system diagram,
FIGS. 7 to 9 are partial explanatory diagrams showing other embodiments. 29...Drilling beam, 36...Cutting blade, 53.53'...Safety clutch, 91...
...Friction clutch (safety clutch), 92...
・Shapin (safety clutch).

Claims (1)

[Scope of utility model registration request] In a device in which a culvert excavating machine 14 having an excavating beam 29 is installed on a tractor 1 so as to be able to be raised and lowered via a hydraulic lifting device 10, a safety clutch 53, 53' drives and controls a rotary cutting blade 36 on the front side of the excavating beam 29. A power disconnection detection switch 81 is provided which operates the hydraulic lifting device 10 upward in conjunction with the power disconnection operation of the clutch 53.53' due to overload.
An underdrain excavation device characterized by being provided with a power transmission detection switch 82 that operates the hydraulic lifting device 10 downward in conjunction with the overload release of step 3'.