JPH051203Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention uses a column with a blade edge placed in the soil and towing it, creating cracks in the hardened subsoil, crushing it, expanding it, and softening it to produce tillable soil. The present invention relates to the structure of a subsoiler (so-called subsoiler) that improves subsoiling.

[Conventional technology]

Normally, when this type of subsoiler is towed and moves forward, it is subjected to resistance from the soil due to the pillars hanging down into the soil in the subsoiler. In order to reduce this traction resistance, compressed air is blown into the soil from the side or front side of the column (Utility Model Application No. 56-91736, Japanese Patent Application Publication No. 57-36207,
(Refer to Japanese Patent Application Laid-Open No. 59-42801).

Among these, JP-A No. 59-42801 discloses a configuration in which compressed air is intermittently ejected, and according to this, the soil crushing effect due to the impact force of the ejection is improved compared to when it is ejected constantly. I found out.

[Problem that the invention attempts to solve]

As described in the above-mentioned publication, this intermittent ejection method is used to eject compressed air at fixed time intervals or at fixed excavation intervals. In addition, if the fixed interval is set to a short interval, more compressed air will be supplied than necessary to light or soft soil, resulting in wasted energy consumption. On the other hand, if the above-mentioned interval is set long to suit soil that is easy to crush, such as the light soil, the amount of compressed air supplied will be insufficient for soil that is difficult to crush.
The traction resistance reduction effect is not achieved as expected.

Therefore, the construction must be such that the operator can change the spacing according to the soil conditions, and since the worker changes the spacing based on experience or intuition, the adjustment may be unstable or incomplete. There were many things that happened.

Therefore, in this invention, in this kind of subsoiling crushing and expansion work, the magnitude of the traction force of the tractor etc. that pulls the subsoiler corresponds to the quality of the soil, and the compressed air required per unit time is adjusted according to the quality of the soil. The above-mentioned problem is attempted to be solved by utilizing the fact that the amount of ejection impact is proportional to the required ejection impact force.

[Means for solving problems]

That is, in the present invention, the traction force between the subsoiler and the towing vehicle is detected, and the number of intermittent compressed air supplies per unit time from the subsoiler into the soil is determined based on the detection signal of the traction force in proportion to the magnitude of the traction force. It is configured to increase or decrease the amount of compressed air or to increase or decrease the amount of intermittent supplied compressed air.

[Effect]

In this type of subsoiler crushing, expansion and softening work, the magnitude of the traction force exerted by a towing vehicle such as a tractor that pulls the subsoiler corresponds to the quality of the soil. The amount of compressed air required to be supplied per unit time and the required ejection impact force are proportional to the quality of the soil. for example,
In soil that is difficult to crush, the traction force becomes large, and therefore the blowout impact force due to the intermittent supply of compressed air per unit time required to contribute to reducing the traction force also becomes large. On the other hand, in soil that is easily crushed, the traction force is small, and therefore the impact force required for intermittent supply compressed air blowout per unit time is also small.The magnitude of the traction force is detected, and this detection signal is used to supply compressed air from the subsoiler into the soil. By controlling the number of intermittent times or the amount of compressed air supplied intermittently per unit time, the required amount of compressed air can be automatically released into the soil, which can significantly and effectively reduce traction force and eliminate energy loss. I can do it. In addition, the operator can perform the subsoil crushing and swelling work efficiently without relying on his senses.

〔Example〕

Next, to explain an embodiment of the present invention, in the figure, 1 indicates a towing vehicle such as a tractor for towing a subsoiler 2, which will be described later. 6 and transmits the power from the engine 6 to the rear wheels 5,
Power is transmitted to the PTO shaft 7 that protrudes behind the fuselage 3.
The body 3 is also equipped with a hydraulic pump (not shown) that drives a hydraulic cylinder associated with a lift arm 8 that projects rearward.

The subsoiler 2 is equipped with a tail wheel 10 at the rear of its main body 9, and the front end of the main body 9 is vertically movably connected to the rear of the towing vehicle 1 via a link mechanism 13 consisting of a lower ring 11 and a top link 12. The lower link 11 and the lift arm 8 are connected via a lift link 14 so as to be able to move up and down significantly.

On the main body 9 of the subsoiler 2, a pressure storage tank 15,
A compressor 16 is mounted, and the compressor 16
is driven from the PTO shaft 7 via a universal joint 17.

The subsoiler 2 main body 9 has a blade 18 on the front side.
A column 20 having a chisel 19 at the lower end.
Attach the pillar body 20 so that the upper end is inclined backward.
A hole molded body 21 is connected to the rear portion of the lower end. The column 2
A blowhole 22 for blowing compressed air forward into the soil is opened on the lower front surface of the blade 18, and a cover body 23 with an L-shaped cross section and open left and right ends is fixed to the front side of the blowhole 22. Cover the soil with column 2.
Soil is prevented from entering the fumarole 22 when the 0 moves forward.

The columnar body 20 has a conduit 2 that communicates with the jet nozzle 22.
The conduit 24 is formed in a vertically elongated manner or is installed along the conduit 24, and the upper end of the conduit 24 is connected to the pressure accumulator tank 15.

Reference numeral 25 denotes a traction force detection sensor such as a strain gauge type that detects the traction force of the subsoiler 2, and the sensor 25 is installed at a mounting portion where the base end of the top link 12 in the link mechanism 13 is attached to the rear part of the body 3 of the tractor 1. However, in other embodiments, it may be provided in the middle of the top link 12 or in a position closer to the subsoiler 2.

The control means for intermittently jetting out compressed air from the jet nozzle 22 in proportion to the magnitude of the traction force based on the detection signal from the traction force detection sensor 25 controls the jet operation time and the amount of compressed air per unit time during the operation time. In a case where the ejection pause time interval is changed to a longer or shorter time while the ejection pause time is kept constant, there are cases where the ejection pause time interval is kept constant and the amount of compressed air per unit time during the ejection operation time is changed in size.

What is shown in FIG. 2 is a case in which the above-mentioned jet operation time and the amount of compressed air per unit time during the operation time are constant, and the jet stop time interval is changed to be long or short. An electromagnetic on-off valve 26 is provided in the middle of the conduit communicating with the jet nozzle 22, and an analog timer 28 in the control device 27 is provided.
By energizing the solenoid of the electromagnetic on-off valve 26, the opening time of the on-off valve 26 is set in advance to a constant ejection time. Then, the analog timer 28 receives a detection signal from the traction force detection sensor 25 at appropriate time intervals predetermined, and the logic circuit 2
9, if the traction force is large, the OFF time of the solenoid of the electromagnetic on-off valve 26 is shortened to shorten the jetting pause time interval. In other words, compressed air is jetted intermittently with short intermittent intervals per unit time. On the other hand, if the traction force is small, the closing time of the on-off valve 26 is lengthened, and control is performed so that the pause time interval between jetting of compressed air is lengthened.

In this configuration, power is transmitted from the PTO shaft 7 to the compressor 16 of the subsoiler 2 connected to the tractor 1, and while compressed air is accumulated in the pressure storage tank 15, the column 20 of the subsoiler 2 is inserted into the soil. advance. At this time, if the soil is hard or clay soil, the traction force will be large, and accordingly the traction force detection sensor 25 will output a detection signal, and the control device 27 will cause the compressed air to blow out during a certain period of time. Shorten a given eruption pause time interval.
Thereby, it is possible to repeatedly apply an ejection impact force to the soil that is difficult to crush, thereby improving the soil crushing effect and reducing the traction force.

On the other hand, when the soil is light or soft, the traction force is small, so the traction force detection sensor 25
The compressed air jetting pause time interval is lengthened under the control of the control device 27 based on the detection signal output from the controller 27.

FIG. 3 shows a case where the jetting pause time interval is constant and the amount of compressed air per unit time during the jetting operation time is varied. A flow control valve 30 that can be turned off is provided, and the flow control valve 30 is controlled by an analog timer 30 in the control device 27'.
By energizing the drive device 31, such as a servo type, the length of the closing time of the flow control valve 30 and the interval time thereof are made constant, and the ejection time of the compressed air is also set to be constant in advance. Then, the analog timer 28
Detection signals from the traction force detection sensor 25 are received at predetermined appropriate time intervals, and a logic circuit 29 makes a judgment based on the magnitude of the traction force. The blowhole 22 with the valve 30 in the open direction
By increasing the flow rate of compressed air released from the soil, in other words, by increasing the impact force of each jet of compressed air that is intermittently injected per unit time, it is possible to apply a large jet impact force even to soil that is difficult to crush. , the soil crushing effect can be improved and the traction force can be reduced.

On the other hand, if the traction force is small, the flow control valve 3
Even if the flow rate of the compressed air discharged from the nozzle port 22 is reduced by setting the valve 0 in the restricting direction, in other words, the impact force of each jet of compressed air intermittently jetted per unit time is reduced. There is no reduction in

It goes without saying that the direction in which the compressed air is ejected is not limited to the front direction of the columnar body 20, but may also be directed to both left and right side surfaces.

[Effect of idea]

In summary, according to the present invention, the traction force between the subsoiler and the traction vehicle is detected, and the compressed air per unit time is supplied from the subsoiler into the soil in proportion to the magnitude of the traction force based on the detection signal of the traction force. It is configured to increase/decrease the number of intermittent supply intervals or to increase/decrease the amount of intermittent supply of compressed air.In soil that is difficult to crush, the traction force becomes large, so the number of intermittent supply of compressed air is increased accordingly, or the amount of compressed air supplied intermittently is increased or decreased. By increasing the amount of compressed air, the crushing impact force can be increased, making it easier to crush. In addition, soils that are easily crushed can be crushed effectively without needlessly injecting compressed air, and the traction force can be reduced overall regardless of the type of soil, making it possible to perform energy-saving crushing, swelling, and softening work. has.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the device, FIG. 2 is a schematic circuit diagram of a control device, and FIG. 3 is a schematic circuit diagram of another embodiment of the control device. 1... Traction vehicle, 2... Subsoiler, 7...
PTO axis, 13...link mechanism, 15...accumulator tank, 16...compressor, 18...blade body, 1
9...chisel, 20...column, 22...fumarole,
23... Cover body, 24... Conduit, 25... Traction force detection sensor, 26... Open/close valve, 30... Flow rate adjustment valve, 27, 27'... Control device.

Claims (1)

[Scope of utility model registration request] In a subsoiler configured to intermittently blow out compressed air into the soil from the towed subsoiler, the traction force between the subsoiler and the tow vehicle that pulls the subsoiler is detected, and a detection signal of the traction force is used to detect the traction force in proportion to the magnitude of the traction force. A subsoiler configured to increase or decrease the number of intermittent compressed air supplies per unit time or to control the amount of compressed air that is intermittently supplied into the soil from the lower end of the subsoiler.