JPH0335883B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is attached to the rear of a self-propelled vehicle such as a tractor, and during the process of being towed and moved, compressed air is blown into the deep layer of the soil, causing cracks. This invention relates to a self-propelled pneumatic soil improvement machine that improves soil by expanding and softening it.

[Conventional technology]

As this type of self-propelled pneumatic soil improvement machine, as described in, for example, Japanese Utility Model Application Publication No. 125201/1982 and Publication No. 29102/1989, a three-point support link mechanism is installed at the rear of the tractor. A soil conditioner equipped with a soil improver that can be moved up and down has been proposed. The soil improvement machine has a vertical fumarole blade (blade body) that protrudes long below the body frame, and the vertical fumarole blade is plunged into the deep layer of the soil, and air is emitted from the jet nozzle provided at the lower end of the blade. The structure is such that it ejects it forward and upward.

In this type of self-propelled pneumatic soil improvement machine that has a vertical jet blade that protrudes long downward from the machine body, the vertical blade In order to prevent the lower end of the blade from colliding with unevenness or ridges on the ground surface, it is necessary to change the attitude of the soil improver relative to the tractor to raise the lower end of the vertical blade higher above the ground.

Conventionally, as a means for raising a working machine attached to the rear part of a tractor via a three-point support link mechanism to a high ground height, for example, the prior art described in Japanese Patent Application Laid-open No. 103305/1983 is known. There is.

In this prior art, the top link constituting the three-point support link mechanism is constructed with a telescopic hydraulic cylinder, and in addition to lifting the first stage by the hydraulic lift mechanism provided in a normal tractor, the top link also has hydraulic pressure. The second stage can be raised by contracting the cylinder.

[Problem to be solved by the invention]

In the case of the above-mentioned prior art (Japanese Unexamined Patent Publication No. 103305/1983), the following problems arose because the top link of the three-point support link mechanism was constituted by a hydraulic cylinder.

First, when raising and lowering the work equipment, in addition to raising and lowering the first stage using the normal hydraulic lift mechanism provided on the tractor, it is also necessary to lift and lower the second stage twice, making the raising and lowering operation extremely complicated. In addition, when the top link is configured with a hydraulic cylinder, in addition to the introduction piping system that leads the pressure oil to the hydraulic cylinder, there is also a piping system that takes the pressure oil back from inside the cylinder to the oil pan side. The top link (hydraulic cylinder) configuration becomes extremely complicated, as each piping system for introducing and deriving these systems requires multiple switching valves to switch the flow of oil. In addition, the top link, which is composed of a double-acting hydraulic cylinder as in the prior art described above, cannot provide a buffering function. If the vertical blade penetrates deep into the soil and advances, and as it advances, it collides with obstacles such as stones in the soil and receives a large impact force, the effect of absorbing the impact force cannot be obtained. It was predicted that there would be problems such as the vertical jet blades being damaged by impact force.

In view of the above-mentioned problems, the present invention focuses on the fact that the working machine (soil improvement machine) that is the subject of the invention is equipped with a compressed air source and stores the compressed air in an air tank. It is an object of the present invention to provide a self-propelled pneumatic soil improvement machine that is improved so that the above-mentioned disadvantages can be solved by simple means without providing a mechanism.

[Means to solve the problem]

In order to achieve this objective, the self-propelled pneumatic soil improvement machine according to the present invention includes: (A) a compressor and an air tank for accumulating compressed air at the rear of the self-propelled vehicle; A soil improver having a long vertical jet blade that protrudes downward from the machine body in order to blow air into the deep layer of the soil is mounted so that it can be raised and lowered via a three-point support link mechanism, (B) The above three-point support (C) The top link constituting the link mechanism is composed of a pneumatic cylinder that expands and contracts with compressed air in an air tank provided on the soil improvement machine side, and (C) is installed in the middle of an air supply pipe connecting the pneumatic cylinder and the inside of the air tank. A switching valve is provided, while
When a hydraulic lift mechanism provided on the self-propelled vehicle lifts the soil improvement machine via a three-point support link mechanism, a detection mechanism is provided that senses and operates at the upper limit position, and the detection mechanism switches the switching valve. The present invention is characterized in that it is configured to automatically raise the soil improving machine to change its posture to a forward-leaning posture by contracting the pneumatic cylinder.

[Effect]

In such a configuration, when the soil conditioner is raised to its upper limit position using a normal hydraulic lift mechanism installed on the tractor, the switching valve is switched by the detection mechanism that detects the top lift. The pneumatic cylinder that makes up the soil conditioner contracts and the soil conditioner is automatically raised to a forward-leaning position, so that the long vertical jets of fumes that protrude downward from the soil conditioner side are removed without any special operation. The lower end of the blade can be raised to the required ground height.

In addition, since the top link is composed of a pneumatic cylinder, the compressed air that expands and contracts the cylinder can be released directly into the atmosphere by switching the valve when the cylinder is not being supplied. The system is greatly simplified and the configuration of the top link can be simplified.

Furthermore, when the top link is configured with a pneumatic cylinder, the top link itself can be configured to have a buffering function, and this buffering function prevents obstructions such as stones from occurring while the vertical jet blade is moving into the soil. When the engine collides with the engine and receives an impact, the top link (pneumatic cylinder) uses the lower link pin as a fulcrum to absorb the impact force, thereby preventing damage to the vertical jet blades.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a well-known riding type tractor (self-propelled vehicle), and the rear part of the tractor 1 has a conventional well-known type consisting of one top link 2 and a pair of left and right lower links 3. A three-point support link mechanism 4 is provided, and a soil improver 5 is mounted via the three-point support link mechanism 4 so as to be able to move up and down.

The soil improvement machine 5 includes a hollow main body frame 6 extending in the left-right direction, a top mast 7 connected to the top link 2, and a lower link pin 8 connected to the lower link 3. At the rear of the main body frame 6 at the rear position, a mounting base 9 extends rearward, and a compressor 10 and a main air tank 11 are mounted on the mounting base 9 in the front and back directions. The input shaft 10a of the compressor 10 is projected forward;
Rotational power is transmitted to the tractor 1 from the PTO shaft 1a of the tractor 1 through a power transmission system 12 consisting of a well-known propeller shaft. The above compressor 1
The compressed air compressed to zero is stored in the main air tank 11 via the communication pipe 13. Note that the compressor 10 and main air tank 11 may be provided on the tractor 1 side.

A pair of vertical jet blades 14 (only one is shown in the drawing) hanging downward is attached to the left and right end portions of the main body frame 6. A body 15 is attached. The vertical fumarole blade 14 is slightly inclined so that its lower end is located slightly forward of the base side of the upper part when viewed from the side, and a blade edge 14a is attached to its front edge, and an air supply pipe 16 is attached to its back. has been done. The air jet 15 is provided with a sharp-pointed nozzle portion 17 having an arrowhead-like tip on the front side, and a jet nozzle 18 is opened upward in the nozzle portion 17. The compressed air from the air supply pipe 16 is then brought to the nozzle part 17 through the air jet 15,
It is designed to be ejected upward from the fumarole 18.

The upper end of the air supply pipe 16 is connected to the solenoid valve 1.
9 communicates with sub-tanks 20 provided on both sides of the base end of the vertical jet blade 14. The solenoid valve 19 is opened and closed by a switch mechanism (not shown) in a switch box 19a provided at the rear of the compressor 10, and the opening and closing timing of this valve 19 can be adjusted as appropriate. Furthermore, the main air tank 11 and the sub-tank 20 are communicated with each other by a communication pipe 21, so that when the solenoid valve 19 is opened and the compressed air stored in the sub-tank 20 is blown out from the blowhole 18, the main air tank 11 and the sub-tank 20 are immediately connected to each other. The sub-tank 20 is filled and pressure-accumulated with compressed air from the sub-tank 11 via a communication pipe 21. A coulter 23 is supported on the front side of the vertical fumarole blade 14 via a support arm 22 extending forward from the main body frame 6, and this coulter 23 cuts the soil surface on the front side where the vertical fumarole blade 14 moves to a predetermined depth. I'm trying to keep going.

The top link 2 constituting the three-point support link mechanism 4 is composed of a pneumatic cylinder 24, with its cylinder support rod 24a connected to the top mast 7 side, and its piston rod 24b connected to the tractor 1 side. An air supply pipe 26 passing through a switching valve 25 communicates with the pneumatic cylinder 24, and the switching valve 25 communicates with the main air tank 11 via another air supply pipe 27. Further, a solenoid 28 is provided above the switching valve 25 to operate the valve 25, and this solenoid 28 is activated when the lift arm 3a of the hydraulic lift mechanism normally provided on the tractor 1 reaches the upper limit rotation end. It is turned on and off by a micro switch 29 as a detection mechanism that is pressed. Then, the soil improvement working machine 5 is moved to the lower link pin 8 by the expansion and contraction movement of the pneumatic cylinder 24 (top link 2).
It is configured so that the overall posture can be changed by rotating around the center.

Next, the operation of the above embodiment will be explained. The soil improvement machine 5 is attached to the rear of the tractor 1 via a three-point support linkage 4, and is attached to the rear of the tractor 1.
Power is received from the PTO shaft 1a to the input shaft 10a of the compressor 10 via the power transmission system 12.

When moving in the working field, the lift arm 3 of the hydraulic lift mechanism provided on the tractor 1
By a, the soil improvement working machine 5 is raised from the state shown in FIG. 1 to the state shown in FIG. 2 via the three-point support linkage mechanism 4.

In this case, when the lift arm 3a is raised and rotated to the upper limit position, the lift arm 3a presses the micro switch 29 that constitutes the detection mechanism,
Micro switch 29 turns on and solenoid 28
The switching valve 25 is activated by energizing the main air tank 11, and the compressed air in the main air tank 11 is introduced into the pneumatic cylinder 24 through the switching valve 25 and the air supply pipe 26, and the introduction of this compressed air causes the pneumatic cylinder 24 to contract. be done. Due to the contraction of the pneumatic cylinder 24, the soil conditioner 5 rotates around the lower link pin 8 and is held elevated so as to change its posture to the forward tilted posture shown in FIG. The lower end will be located 50 to 60 cm higher than the ground, making it difficult to cross over the ridge.
Even when moving in a field with many irregularities, these items can be moved without colliding with the ridges or irregularities of the ground.

When performing the fume work, the soil improver 5 is lowered via the three-point support linkage mechanism 4 by the lift arm 3a of the hydraulic lift mechanism. As a result of this lowering, the pressure on the micro switch 29 by the lift arm 3a is released, the excitation of the solenoid 28 is released, the switching valve 25 is switched, the air is released, the pneumatic cylinder 24 is extended back to its original state, and the state shown in FIG. 2 is achieved. Become. Furthermore, by lowering the three-point support linkage mechanism 4, the soil conditioner 5 moves to the tractor 1 as shown in FIG.
The air blower 15, the nozzle part 17, and the blower vertical blade 14 are pushed into the ground to approximately a predetermined depth by its own weight while being towed by the ground.

In this process, switch box 19
Solenoid valve 19 is activated by operating the switch in a.
is opened at predetermined timing intervals, and subtank 2
The compressed air stored in the air supply pipe 16,
It is vigorously ejected upward from the blow hole 18 through the nozzle portion 17. This ejection of high-pressure air causes cracks in the deep soil above the fumarole 18, and while the aircraft is moving, the ejection of compressed air is sequentially performed at predetermined timing intervals.
Cracks are formed sequentially and the soil is expanded and softened.

During this advancing process, when the part of the vertical fumarole blade 14 that enters the soil collides with an obstacle such as a stone intervening in the soil and receives a shock, the soil improvement machine 5 uses the lower link pin 8 as a fulcrum. This is because the top mast 7 exerts a rotational force in the direction of compressing the pneumatic cylinder 24, and the rotational force acts as a buffer in the direction of contraction of the pneumatic cylinder 24, thereby achieving the effect of absorbing the above-mentioned impact force. The impact force acting on the vertical jet blades 14 is alleviated and damage to the vertical blades 14 can be prevented.

Furthermore, when the soil conditioner 5 is lifted up again by the three-point support linkage mechanism 4 after completing the fume work for a predetermined stroke, the lift arm 3a presses the micro switch 29, causing the pneumatic cylinder 24 to contract as described above. As a result, the soil improvement machine 5 is changed to a forward-leaning position and is held raised.

〔Effect of the invention〕

Since the self-propelled pneumatic soil conditioner according to the present invention has the configuration described above, the following effects can be obtained.

(1) When the soil improvement machine 5 is raised by the hydraulic lift mechanism provided on the tractor, when it is raised to its upper limit position, the switching valve 25 is switched by the detection mechanism (micro switch 29) that senses it. The pneumatic cylinder 24 constituting the top link contracts, which causes the soil conditioner 5 to
is automatically raised to change its posture to a forward-leaning position, so the lower end of the vertical blower blade 14, which protrudes long downward on the soil improvement machine side, is raised high to the required ground height without any special operation. can.

(2) Also, since the top link is composed of a pneumatic cylinder 24, compressed air that expands and contracts the cylinder 24 is supplied to the valve 25 when not supplied.
Since the configuration can be such that the gas is released into the atmosphere by the switching operation, the piping system and valve system can be greatly simplified, and the configuration of the top link can be simplified.

(3) Furthermore, when the top link is configured by the pneumatic cylinder 24, the top link itself can be configured to have a buffering function, and this buffering function allows the vertical blower blade 14 to enter the soil while it is in progress. When the impact is received by colliding with an obstacle such as a stone, the top link (pneumatic cylinder 24) uses the lower link pin 8 as a fulcrum to absorb the impact force, thereby preventing damage to the vertical blower blade 14. You can also obtain the effect of preventing this.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams illustrating its operation. 1...Tractor (self-propelled vehicle), 1a...PTO
Axis, 2...Top link, 3...Lower link, 4
... Three-point support link mechanism, 5 ... Soil improvement work machine, 6 ... Main body frame, 7 ... Top mast,
8...Lower link pin, 9...Mounting base, 10...
Compressor, 10a...Input shaft, 11...Main air tank, 12...Power transmission system, 13, 21...Communication pipe, 14...Fume vertical blade, 14a...Blade edge,
15... air fumarole, 16, 26, 27... air supply pipe, 17... nozzle part, 18... fumarole, 19...
...Solenoid valve, 19a...Switch box, 20...Sub tank, 22...Support arm,
23...Coulter, 24...Pneumatic cylinder, 2
4a...Support rod, 24b...Piston rod, 2
5... Valve, 28... Solenoid, 29... Micro switch (detection mechanism).

Claims (1)

[Scope of Claims] 1. A compressor and an air tank for accumulating compressed air are provided at the rear of the self-propelled vehicle, and the air tank protrudes downward for a long time in order to blow the compressed air accumulated in the air tank into the deep layer of the soil. A soil improvement machine having vertical fumarole blades is mounted so that it can be raised and lowered via a three-point support link mechanism, and a top link constituting the three-point support link mechanism is provided on the side of the soil improvement machine. It consists of a pneumatic cylinder that expands and contracts using the compressed air inside, and a switching valve is installed in the middle of the air supply pipe that connects the pneumatic cylinder and the inside of the air tank, while a three-point support link is provided by the hydraulic lift mechanism installed in the self-propelled vehicle. When the soil improvement machine is moved up through the mechanism, it is equipped with a detection mechanism that senses and operates at the upper limit position, and this detection mechanism switches the switching valve and automatically moves the soil improvement machine forward by contracting the pneumatic cylinder. A self-propelled pneumatic soil improvement machine characterized by being configured to be raised so as to change its posture to a tilted position.