JPH03103103A - Spouting air pressure-controlling device in spouting nozzle device for spouting-type soil improver - Google Patents

Abstract

PURPOSE:To set in suitable spouting pressure in accordance with soil by connecting plural unloaders having different setting pressures with each other to spouting air-supplying system and spouting through unloader corresponding to respective spouting pressure. CONSTITUTION:Plural unloaders 913, 914 and 914 having different setting pressures with each other are set in an opening and closingcontrolling circuit 950 and setting pressure of used unloader is transmitted to unloader of compressor 301 by compressorcontrolling circuit 970 to control compressed pressure of the compressor and set in a spouting pressure suitable for spouting operation environment.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a fume air pressure control device for a riding type soil improvement machine, and more specifically, to a fume air pressure control device for a riding-type soil improvement machine, and more specifically, to a fume air pressure control device that selects the air pressure to be emitted into the ground from among preset values. The present invention relates to a fume air pressure control device that allows work to be carried out.

[Traditional techniques]

It is highly desirable to swell and soften fields that are under continuous cropping or that have become hard due to the pressure of tractors, etc., in order to increase the water permeability and water holding capacity of the soil and promote crop growth. , and supplying air into the soil is
It is very useful in promoting the growth of bacteria in the soil and promoting the decomposition of organic matter.

Therefore, many devices and devices have been proposed for expanding and softening soil by explosively supplying compressed air into the soil, and for multiplying bacteria by supplying air.

Among the many conventional examples, the typical prior art is:
Japanese Patent Publication No. 63-10982 can be mentioned.

In the device shown here, a fume work device that blows compressed air into the soil is attached to a tractor via a three-point hitch mechanism, and the fume work device is moved up and down via the lift arm of the tractor. This fume work device is configured to lower the fume nozzle and insert it deep into the soil when a grounding signal is obtained by the grounding sensor to blow compressed air into the soil.

This fume work machine performs fume work on working soil using a fume work machine towed by a tractor, and the main work soil is so-called farm fields such as rice fields and fields.

Supplying air to the soil is effective not only in the fields mentioned above, but also in golf courses where turf is important, especially for soil management around greens.

That is, supplying air into the soil that forms the greens helps the growth of the grass, and is particularly effective in soils that constantly keep the grass in good condition.

[Problem to be solved by the invention]

However, even though it is recognized that it is beneficial to carry out blow work on greens, it is not possible to run the conventionally known blow work machines as described above on the greens of golf courses.

In other words, with conventional soil improvement machines that are pulled by a tractor, once the jet pressure is set, the jet pressure must be used consistently until the work is completed, which is difficult to do in places such as fields. This is not a big problem, but if the soil environment is different for each green, such as the greens of a golf course, if you perform blow work with the same blow pressure on all greens, the blow pressure will vary in the case of soft soil. Blowing in high air will destroy the soil, and instead of promoting grass growth, it may even blow away the grass, so setting the jet pressure is a time-consuming process, so the jet pressure must be set for each work area. There is a need.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fumarolic soil improvement machine that allows the fumarolic pressure to be easily reset during work, and allows suitable fumarolic work to be performed in accordance with the soil.

[Means to solve the problem]

Therefore, in order to achieve the above-mentioned object, the present invention has developed a fumarole-type soil improvement machine equipped with a pressurized air source or a hydraulic power source, at least with a fume nozzle unit placed at the front and back of both left and right sides of the vehicle body. The fume nozzle unit is configured to be able to rise and fall against the ground, and this fume nozzle unit has a hammer part on its upper part for driving the fume nozzle part into the ground, and the fume nozzle unit is lowered to bring the fume nozzle part into contact with the ground. A fume supply system that drives the hammer part to drive the fume to a predetermined depth and communicates the fume nozzle part from the pressure accumulation tank of the pressurized air source through an air operated valve, and the fume that blows into the ground from the pressure accumulation tank. an opening/closing control circuit that controls opening and closing of the air-operate valve by communicating with the air-operate valve via a jet-pressure control circuit having a plurality of unloaders having different pressure setting values and a jet-start valve; The present invention is characterized in that it includes a compressor control circuit that controls a compressor constituting a pressurized air source from the circuit to a jet pressure set in the jet pressure control circuit.

[Effect]

The fume supply system is equipped with multiple unloaders with different set pressures, so you can freely select the fume pressure by using the fume supply system that goes through the unloader that corresponds to the desired blow pressure. It is possible to control the accumulated pressure of the compressor at the same time as selecting the unloader.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, in these figures, the reference numeral 100 is self-propelled and
It shows a passenger-type vehicle body, has wheels as a running part, the front wheels are driving wheels 101, the rear wheels have steering wheels 102 for steering, and the wheelbase and the front and rear treads are set approximately equal. At the rear end of the vehicle body 100 is a seat 103 for the operator to board.
There is a handle wheel 104 facing this seat 103, and this handle wheel 104
The operating sections 105 of each part are arranged in front of the vehicle, so that the operating sections 105 can be operated and visually recognized while steering the vehicle.

Further, an engine 200 is mounted on the left side of the front end of the vehicle body 100, and the output of the engine 200 drives an oil pump 203 via a transmission system 201, a coupling 202, and the like.

A drive shaft branched from the middle of the drive system of this oil pump 203 extends to a drive system of a nozzle section 520, which will be described later.

Further, an engine 300 is mounted near the center of the front end, and its output drives a compressor 301 via a belt 302. A pair of reinforcing bars 106 are attached from both sides to the front of the steering wheel of the car body 100, and this reinforcing bar 106 can be used as a reference while driving. It has a function.

A hydraulic cylinder 401 that constitutes a lifting hydraulic drive system 400 that lifts and lowers a jet nozzle unit, which will be described hereinafter, is located at an intermediate position between the wheel bases on both sides of the vehicle body 100.
A post 402 is installed vertically along the side of the hydraulic cylinder 401, and this post 402 also serves as a pressure storage tank, which will be explained later. One end of a wire 404 is fixed to both left and right ends of this bracket 403, respectively. The other ends of these wires 404 are connected to the post 4 via a pulley 4o4k.
The support arm 405 is fixed to the inner upper support arm 405 of the support arms 405 and 40B, which are provided so as to project symmetrically in the longitudinal direction on both sides of the 02, and whose ends are pivotally supported.

The other ends of the support arms 405, 40B are pivotally supported on the side surface of a guide cylinder 501 constituting the jet nozzle unit 500. tube 502
has been inserted. Inside this support tube 502 is a driven pipe 50 having a blow nozzle portion 503 at its lower end.
4 is housed in such a way that it can move only in the vertical direction without shifting from side to side.

As shown in FIG. 4, one end 505A of a bellows-type elastic boot 505 is fixed to the lower end of the guide cylinder 501, and the other end 505A of the elastic boot 505
A boss 506 is fixed to B, the center of the boss coincides with the center of the guide cylinder 501, and a swivel bearing 507 is fixed inside the boss 506.

A hollow support shaft 508 fixed to the guide cylinder 501 passes through the center of this swivel bearing 507, and the center of this support shaft 508 is connected to the drive pipe 5.
04 runs through it loosely.

The boss 508 has a larger contact area than the tire.
A ground support plate 509 is fixed to expand the ground contact area, and a jet nozzle portion 503 is fixed to this ground support plate 509.
A hole 509A is bored on the extension line of the hole 509A. Therefore, the ground support plate 509 is the guide cylinder 50! Due to the elasticity of the elastic boot 5050, the elastic boot 5050 always maintains a perpendicular state, but can tilt forward, backward, left and right within a range of about 10 to 15'' about the swivel bearing 507.

One end portion 510A of a hydraulic cylinder 510 for extraction that constitutes the hydraulic extraction drive system 700 is pivotally supported on the side surface of the guide cylinder 501, and the telescopic end portion 510B of this hydraulic cylinder is connected to the upper end of the driving pipe. The casing 521 of the hammer part 520 placed in
The driving pipe 504 is driven in by the action of a hammer part 520, and the driving pipe 504 is driven in by the action of a hammer part 520.
04, the blowing nozzle portion 503 is pulled out by extending the pulling hydraulic cylinder 510.

The hammer part 520 has a casing 521 constituting it.
A drive shaft 522 is installed across the internal space,
This drive shaft 522 has an eccentric cam 523 that acts as a hammer.
is attached, and a drive shaft 522 and an input chain wheel 524 for transmitting rotational torque to the eccentric cam are attached to its end. This human-powered chain wheel 52
A chain 525x is suspended from the chain 525x, and a chain case 525 covering the chain 525X is bent in the middle with a chain case 526, which will be described shortly, about the connecting shaft 525A to allow vertical movement of the jet nozzle unit. The other chain case 526 mentioned above is connected to the end of this chain case 525 by a connecting shaft 525A, and the chain 525x is suspended on the connecting shaft 525A. Chain wheel 525B and chain M 526A that suspends chain 526x housed in chain case 526
are each fixed. The opposite side of this chain 526x is suspended on a chain wheel 526B attached to the inside of the other end side of the chain case 526, and this chain wheel 526B is connected to a drive shaft 5 branched from the drive system 201 of the oil pump.
The engine 2 is fixed to 27 and input to the drive shaft 527.
It is designed to be driven by power from 00. From this drive shaft 527 to the chain 528A. Another chain case, in other words, the post 40 via the chain 528
Chain case 526 arranged symmetrically around 2
The power is distributed to the chain wheel 528B at the lower end of the chain to drive the drive system inside the chain transporter.

Due to the eccentric length (eccentricity amount) of the eccentric cam 523, the eccentric cam 523 is connected to the striking portion 504A of the driving pipe 504.
This striking part 50
4A is always pushed up by the push-up spring 504B to push the driving pipe 504 upward, but when the jet nozzle unit is not in contact with the ground, a gap is created between the eccentric cam and the striking part 504A, and the eccentric cam 523 is pushed up. It is designed so that it will not hit even if it is rotating.

Also, a joint 603A is connected from a pressure accumulating tank 801 which also serves as a post 402 to an internal driving pipe 504 from a hole 521A drilled in the side surface of the casing 521 via an operating valve 602 and a pressurized air supply pipe 603.
, 603B to supply pressurized air to the driving pipe 504, which will be described later.

Next, the fume nozzle unit 500 is raised and lowered from the ground, and the fume nozzle section 503 of the fume nozzle unit 500 is
and a hydraulic drive system 70 as a power source for pulling out the driven pipe 504 from underground and driving it to travel.
0 will be explained.

First, the hydraulic bomb 203 is connected via a check valve 711 to a 3-position, 4-way type switching valve 712 which is controlled by SoleMade and has positive flow, stop, and reverse flow positions.
A withdrawing hydraulic conduit 710 is connected to a double-acting withdrawing hydraulic cylinder 510 connected in parallel from 12 and returning to an oil tank 714 .

Furthermore, in parallel with this extraction hydraulic pipe 710, a lifting hydraulic pipe 730 leading to the lifting hydraulic cylinder 401 is connected to the hydraulic pump 203.
30 is circulated to the oil tank 714.

This lifting hydraulic line 730 is branched from the check valve 711, and has a 3-position, 4-way switching valve 731 that is solenoid controlled and has forward, stop, and reverse flow positions. , is connected to the double-acting hydraulic cylinder 401 for lifting and lowering, and is further connected to the oil tank 714 through a hydraulic conduit.

In addition, relief valves 701 and 715 are connected between the discharge side of the hydraulic pump 203, the switching valve 712, and the hydraulic cylinder for withdrawal. A running hydraulic conduit 750 is provided. This traveling hydraulic line 750 has a forward flow, stop, and reverse flow control valve connected to the pipeline extending from the hydraulic bomb 203, and is connected to a 3-position, 4-way type, manual type, and fixed position type traveling switching valve 751. Check valves 752 and 7 are provided on the output side and return side of the travel switching valve 751, respectively.
Relief valves 753 and 755 are connected through 54, and a check valve 7 is connected to the discharge side of these relief valves 753 and 755.
5B and 757 are connected to each other. These check valves 758, 757 are connected to the discharge side pipe line and the return side pipe line, forming a circulation path including the relief valves 753, 755.

Further, from the check valves 752, 754, pipelines are connected to two oil motors 758, 759 which are connected in parallel to each other.
The front wheels 101 are driven by rotational torque of 9.

The travel selector valve 751 is configured such that an operator seated on the seat 103 can select one of the three positions manually or by pressing the foot.

Further, the telescopic end portion 5 of the hydraulic cylinder 510 for extraction is
A switch 811 for detecting an extended state is attached to 10B, and these switches 811 are connected in series, and come into contact with a contact point 812A of a switch circuit 812 when the hydraulic cylinder is fully extended. . This switch circuit 1812 includes a toggle type main switch 813 that can select one of two contacts 813A and 813B. This switch circuit 812 includes vertical motion control switches 814 and 815 for controlling the movement of the lifting hydraulic cylinder 401. It has become. Contacts 814A, 81
4B are respectively connected to the solenoids of the extraction switching valve 712, and contacts 815A and 815B are connected to the solenoid of the lifting switching valve 731, and the control circuit 8
00 is configured.

Further, the blow control circuit 900 that supplies pressurized air to the blow nozzle unit 500 has a compressor 301 with an unloader that is driven by the engine 300. It is intended to supply
A fume supply system 600 having a communicating body cylinder 602A and a block body cylinder 602B from a pressure accumulating tank 60l and reaching the jet nozzle unit 500 via an air operated valve 602 that is always offset to the block body cylinder.
The purpose is to control the

An air cleaner 911 is connected to a conduit that communicates with the pressure accumulation tank 60l of the fume supply system 600, and a regulator 912 is connected in series to the air cleaner 911. Furthermore, the air cleaner 911 is equipped with unloaders 913, 914, and 9 each having a different set pressure.
15 and the relief valve 91B are connected in parallel to each other.

The pressures set on these unloaders are, for example, 9, 7,
They are determined to be different from each other, such as 5-pressure columns ●p● square centimeters. The output sides of the two unloaders 913 and 914 with high set pressures are connected to the first stage injection pressure selection valve 92.
The output side of the first stage injection pressure selection valve 92l and the output side of the unloader 915 having a low set pressure are connected to the second stage injection pressure selection valve 922. These jet pressure selection valves 921 and 922 are both manual types, and the output side of the second stage jet pressure selection valve 922 is connected to a jet start valve 923, which controls the jet supply. It is connected to the drive end of the air operated valve 602 of the system.

Reference numeral 924 in the figure indicates a pressure gauge that indicates the pressure of the jet emitted from the jet nozzle 503.

Furthermore, an opening/closing control circuit 950 that drives the air operated valve 602 extends from the jet injection start valve 923,
When the injection starting valve is switched from the stop position 923A to the drive position 923B, air pressure from the combustor 301 communicates with the air operated valve 602 against the counter spring through the opening/closing control circuit 950.
It is designed to switch to 02A.

Further, the jet pressure set value determined by the unloader group is transmitted by a compressor control circuit 970 extending from the input end of the jet start valve 923 to the unloader of the compressor 301.

Next, the actual operation using the jet nozzle device of the riding-type soil improvement machine according to the present invention will be explained. First, the rider-type soil conditioner is driven to the destination of the fumarole work, for example, to the green of a golf course, and then boarded. The work equipment is moved by rotating the oil pump 203 with the output of the engine 200, and driving the driving wheels 101 with the output.At the same time as driving the oil pump 203, the compressor 301 is driven with the output of the engine 300, and the pressure accumulating tank 60! It stores air at a predetermined pressure and uses it as a pressurized air source.

At the start of work, the support arms 405 and 40B whose ends are supported by the post 402 are moved from the state shown in FIG. 3(A) to the state shown in FIG. 3(B) by extending the lifting hydraulic cylinder 401 via the wire 404. By rotating the jet nozzle unit 500, the jet nozzle unit 500 is grounded. At this time, even if each of the four fume nozzle units 500 touches the ground with a difference in height, each fume nozzle unit 500 absorbs it by changing the amount of slack in the wire 404, and the fume nozzle that touched down first The unit 500 will not interfere with the jet nozzle unit 500 that will be grounded later.

The grounded fume nozzle unit 500 has its own weight supported by the support plate 509 that is grounded on the green.
The ground contact position is determined as the driving position of the driving pipe. In addition, the unevenness of the green is caused by the elastic boots 505 of the ground support plate 509 provided on each jet nozzle unit 500.
Since it is supported by the swivel bearing 507, it is absorbed by tilting within an appropriate range. When the jet nozzle unit 500 is suspended in the air, the elasticity of the elastic boot 505 keeps the ground support plate 509 substantially perpendicular to the driving direction.

After the blow nozzle unit 500 is in the grounded state, the chain case 525 shown in detail in FIG.
The eccentric cam 523 that constitutes the hammer part 520 located at the top of the jet nozzle unit 500 is driven by the drive shaft 522 through chains 525X and 526X housed in the shaft 526. At this time, when the striking part 504A of the driving vibration 504 contacts the eccentric cam 523 when the lower end of the driving vibration 504, in other words, the jet nozzle part touches the ground and the weight of the hammer part etc. is applied, the driving vibration 504 Due to the rotation of the eccentric cam 523, it is hit and driven into the green ground through the hole 509A of the ground support plate 509, and the jet nozzle portion 503 is formed as shown in FIG. 3(C).
The predetermined depth is reached as shown in .

The lifting hydraulic cylinder 401 is operated as follows. First, in FIG. 3(C), the extraction hydraulic cylinder is in a contracted state, the jet nozzle part 500 is underground, and from this state, the main switch 813 is closed to the contact point 813.
B and further selects the contact 814B of the vertical movement control switch 814, the solenoid of the extraction changeover valve 7!2 is energized to switch its position from the block body cylinder 712A to the reverse flow body cylinder 712X, and the extraction cylinder 510 extends in the stretching direction.

And the telescopic end 5IOB at the upper end is the switch 811
This will close the contact 812A. The jet nozzle portion is pulled out from underground by the pulling cylinder 510 (FIG. 3B). Then, when the main switch 813 of the control circuit 800 shown in FIG. Then, the block body cylinder 731A is switched to the reverse flow position 731X, and the lifting cylinder 401 starts to contract, raising the jet nozzle unit 500 (FIG. 3A).

Conversely, in order to lower the jet nozzle unit 500 in the ascending state, contrary to the above, first switch the vertical movement control switch 815 to the contact point 815A, and then the elevation changeover valve 713 changes to the normal flow position switch 731Y. , the old lifting hydraulic cylinder 4 is extended and the jet nozzle unit 500 is installed.
lower. When the jet nozzle section 503 is in the grounded state, driving by the hammer section 520 is started.

The oil acting in the direction of extension of the drawing cylinder 510 due to this driving action is returned to the oil tank 714 from the backflow body cylinder 712X of the drawing switching valve 712.

Then, when the fume nozzle part 503 reaches a predetermined depth, the fume work is performed (the fume work will be described later).
. After that, by the above-mentioned pulling operation, the jet nozzle part 503
When the main switch 813 is switched to the contact 813B and the vertical movement control switch 814 is switched to the contact 814A, the forward flow position 712Y of the extraction switching valve 712 is selected, and the extraction hydraulic cylinder 510 is pulled up from the ground again. contracts and performs a pulling action.

When the jet nozzle part 503 is underground, the extraction cylinder 510 is in a contracted state, all the contacts 812A of the switch circuit corresponding to the extraction cylinder are open, and the main switch 813 is switched to the contact 813A. However, the switch circuit 812 is in an open state, and even if the vertical motion control switch 815 is operated, the vertical movement control switch 815 causes the vertical movement hydraulic pipe 730 to move in the direction that drives the vertical movement hydraulic cylinder 401, in other words, the vertical movement control switch 815 is operated. The drive current that makes 731 a positive flow body cylinder 731Y does not flow. In other words, the lifting hydraulic cylinder 40+ is not driven when the fume nozzle part 503 is not pulled out from the ground. In other words, after the fume nozzle part 503 is completely removed from the ground and the extraction is completed. For the first time, the hydraulic cylinder for lifting and lowering became operational and is now functioning as a safety device.

Next, we will explain the fumarole work. First, the compressor 301 driven by the engine 300 accumulates pressure until it reaches a predetermined pressure, and when the pressure exceeds that, the unloader operates to eliminate the load on the compressor. And the operation section 10
5, unloaders 913, 914 with different set pressures,
915, for example, the unloader 913, the first stage jet pressure selection valve 921 is set to the positive flow cylinder 921A, and the second
The stage injection pressure selection valve 922 is switched to the normal flow cylinder 922A, and pressure is applied to the injection start valve 923 through this, so if the injection start valve 923 is artificially opened using the operation unit 105, the pressure air The flow reaches the air operated valve 602 via the opening/closing control circuit 950, switches the block body 602B to the communication position 602A, and is injected into the ground from the jet nozzle portion 503. At this time, since the pressure storage tank 601 supplies pressurized air to the two jet nozzle sections, the air tends to be ejected toward the direction with less resistance. Therefore, the pressure storage tank may be divided for each jet nozzle section.

In addition, when performing the fume work with the fume pressure set to the unloader 915 with the lowest set pressure, the second stage squirt pressure selection valve 922
This is done by switching the position of the communication valve 922A to the reverse flow valve 922B and switching the jet start valve 923. When selecting an intermediate set pressure, the first stage injection pressure selection valve 921 is changed from the communication unit 921A to the backflow unit 921B, and the second injection pressure selection valve 922 operates the injection pressure start valve 923 using the communication unit 921A. In other words, pressurized air is ejected from the ejector nozzle portion 503 by manually pushing in the ejector start valve 923 . The set value (air pressure) set by the unloaders 913, 914, and 915 is transmitted to the compressor control circuit 970.
The unloader of the compressor is operated via the compressor, and when the set pressure is reached, the compression function is canceled.

〔Effect of the invention〕

As is clear from the above description, according to the fumarole air pressure control device for the fumarole-type soil improvement machine of the present invention, a plurality of unloaders with different set pressures are provided in the opening/closing control circuit, and the squirt pressure is controlled by selecting the unloader. It is configured so that it can be set arbitrarily, and the set pressure of the unloader is transmitted as a signal to the unloader of the compressor to control the compression pressure of the compressor, so it is easy to set the jet pressure suitable for the jet work environment. can be selected and the fume can work at that pressure.

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, and FIG. 1 is a side view of a riding-type soil improvement machine equipped with a fume air pressure control device, and FIG.
The figure is also a plan view, Figure 3 is an explanatory diagram showing the working order of the jet nozzle device, Figure 4 is an enlarged cross-sectional view of part A hydraulic circuit diagram showing the traveling system, Figure 6 shows the jet fuel supply system and
FIG. 7 is an explanatory circuit diagram showing the control system, and FIG. 7 is an explanatory diagram of the impact power transmission system of the driving pipe. +00...Vehicle body, 101...Drive wheel, 102...
...Steering wheel 103...Seat, I04...Handle wheel, 105...Operation unit 200...Engine, 20I...Transmission system, 20
2...Cubling, 203...Oil bomb 3
00...Engine, 301...Compressor,
302...Belt, 400...Hydraulic drive system for lifting and lowering, 401...Hydraulic cylinder for lifting and lowering, 401A...Telescopic end portion 402.
...Post, 403...Bracket, 4o4...
... Wires 405, 40B... Support arm, 500... Fumes nozzle unit, 501... Guide cylinder, 5o2... Support tube, 503... Fumes nozzle section, 5o4...・・・
Driving pipe, 504A...Blowing part, 504B...
... Push-up spring, 5o5 ... Elastic boots, 505A
...One end, 505B...Other end, 506...
... Boss, 507 ... Swivel bearing, 508 ...
...Support shaft, 509...Ground support plate 509A...
・Hole, 5lO...Hydraulic cylinder for extraction, 510
A... One end part, 510 B... Telescopic part, 520...
... Hammer part, 521 ... Casing, 522 ...
... Drive shaft, 523 ... Eccentric cam, 524 ...
Input chain, 525X...Chain, 525A...
・Connection shaft, 525B... Chain wheel, 526...
・Chain case, 526A. 526B...Chain wheel, 528X...Chain, 527...Drive wheel,
528... Chen, 528A. 528B...
Cheng 600... Fumarole supply system, 601... Pressure accumulator tank, 602... Air operated valve, 603... Pressure air supply pipe, 603A, 603B... Joint 700...・Hydraulic drive system for extraction, 710...
Extraction hydraulic line, 70I...Relief valve, 71
1...Check valve, 7I2...Removal switching valve,
7l4... Oil tank, 715... Relief valve, 730... Hydraulic pipe for lifting, 73! ...Elevating switching valve, 750... Traveling hydraulic line 751... Traveling switching valve, 752, 754...
・Check valve 753, 755... Relief valve, 758
, 757... Check valve, 758, 75B... Oil motor 800... Control circuit, 1111...
Switch, 812...Switch circuit, 812A...
...Contact, 813...Main switch, 813A,
813B... Contact, 814, 815... Vertical movement control switch 814A, 814B, 815A, 8
15B...Contact 900...Fume control circuit, 91
l...Air cleaner, 912...Regulator, 913, 914, 915...Unloader, 9I6
... Relief valve, 921 ... 1st stage jet pressure selection valve, 922 ... 2nd stage jet pressure selection valve, 923 ... Spray start valve, 924 ... Pressure gauge 950 ...Opening/closing control circuit, 970...Compressor control circuit-36-1

Claims (1)

[Claims] (1) At least a fume-type soil improvement machine equipped with a pressurized air source or a hydraulic power source is configured such that at least the fume nozzle units located at the front and back of both left and right sides of the vehicle body are movable up and down with respect to the ground. has a hammer part on its upper part for driving the fume nozzle part into the ground, lowers the fume nozzle unit to bring the fume nozzle part into contact with the ground, and drives the hammer part to drive the fume nozzle part to a predetermined depth; A jet pressure system having a jet supply system that communicates from a pressure storage tank of a pressure air source to the jet nozzle section via an air operated valve, and a plurality of unloaders having different set values of jet pressures for jetting jets from the pressure storage tank into the ground. An opening/closing control circuit that communicates with the air operated valve via a control circuit and a jet injection start valve to control opening and closing of the air operated valve, and an opening/closing control circuit that controls the opening and closing of the air operated valve through a control circuit and a jet injection start valve, and an opening/closing control circuit that controls the opening and closing of the air operation valve, and a jet pressure control circuit that controls the jet pressure to the compressor constituting the pressurized air source. 1. A fume air pressure control device for a riding soil improvement machine, comprising a compressor control circuit that controls the ejection pressure to a set value in a pressure control circuit.