JPH0249813A - Running device for weak ground processing machine - Google Patents

Abstract

PURPOSE:To prevent a shoe of a crawler from being worn and broken due to a difference in running speed between crawlers, by providing synchronization control coupling oil motors for synchronizing the drives of oil motors for driving the crawlers. CONSTITUTION:Crawler running parts C1, C2, C3, C4 on both sides of a weak ground processing machine are driven by drive oil motors 19, 20 having the same performances. Synchronization control coupling oil motors 12, 13, 14, 15 having the same performances and equal volumetric efficiencies per revolution are disposed between pressure supply sections P1, P2 and the above-mentioned drive oil motors 19, 20. With this arrangement, it is possible to prevent a shoe of a crawler from being worn or broken due to a difference in running speed between crawlers, and to eliminate unreasonable stress concentration to a crawler fixing part even on an off-road ground.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a soft ground treatment system equipped with a self-propelled crawler having a float for stabilizing soft ground such as reclaimed land and muddy wetlands. The present invention relates to a traveling device for a machine for treating extremely soft ground, especially a machine for treating extremely soft ground that is equipped with four or more of the above-mentioned crawlers.

[Conventional technology and its problems]

In recent years, machines equipped with self-propelled crawlers with floats have come to be used as machines for stabilizing soft ground such as reclaimed land and muddy wetlands. The original self-propelled soft soil treatment machine consisted of two crawlers with flora attached and fixed at an appropriate interval, with a stirring shaft that could be moved laterally. If the ground to be covered is extremely soft ground, there is a problem in that with one float type crawler on each side, the load per unit area of each crawler becomes large, causing the crawler to sink significantly, making it impossible to run. In addition, recently, larger processing machines have been adopted for the purpose of improving processing capacity due to economic effects, which increases the weight of the entire processing machine and further increases the load per unit area. Large machines with two or more crawlers on each side and two stirring shafts have come into widespread use.

That is, in the figure, cl, C2, c, , c are self-propelled crawlers with floats, with a wide interval in the center, and crawlers Ca1C2,
C3 and C4 are arranged in parallel and fixed by a connecting rod 11.

1 is a turret; 2 is a stirring shaft vertically moving table mounted on the top of the turret 1 so as to be able to move up and down;
The turret 1 is moved up and down along the sliding portion 1a by a vertical movement drive device 3.

Reference numeral A denotes a stirring shaft with a stirring member B attached to its lower end, the two upper parts of which are supported by a stirring shaft vertical movement table 2, and the lower part supported by the lower part of the turret 1 via a support member 1b. Reference numeral 3 denotes a stirring shaft vertical movement drive device for driving the stirring shaft vertical movement table 2, and by driving this, the stirring shaft A is moved vertically via the movement table 2.

Reference numeral 4 denotes a traverse rail device section, and 5 a turret attachment member integrally attached to a traverse slide device 6 disposed on the traverse rail device section 4. The turret 1 is attached to the attachment member 5 so as to be vertically slidable. 7 is a hydraulic cylinder for vertical movement of the turret, which has one end attached to the turret 1 and the other end attached to the turret mounting member 5;
It is designed to move up and down. 8 is the driver's cab.

Reference numeral 9 denotes a hydraulic cylinder for longitudinal direction control, which is attached to the traverse slide device 6 and the turret attachment member 5, and when operated, controls the longitudinal position of the turret 1 via the turret attachment member 5; Reference numeral 10 denotes hydraulic pressure for lateral control, which is attached to both the front and rear sides of the traverse slide device 6, and is operated to control the lateral position of the turret 1 via the traverse slide device 6 and the turret attachment member 5. It is a cylinder.

The operation of the soft ground treatment machine will be explained as follows.

That is, when the turret 1 is located near the left end in FIG. 1, the center of gravity of the machine moves to the left of the center compared to when the turret 1 is located at the center of the soft ground treatment machine, so each float type crawler c1. It is clear that the load acting on the crawler C1 is the largest and the load acting on the crawler C4 is the smallest, and the load acting on each float type crawler c1. C2,c
,, The ground plane of C4 is inclined with respect to the horizontal plane of the improved ground,
The rate of inclination increases as the improved ground becomes softer.

In this way, if the turret 1 remains tilted, the deeper the improvement depth, the larger the untreated portion at the tip will remain.
Since the soft ground will not be reliably improved, the longitudinal position of the turret 1 is controlled by the longitudinal control hydraulic cylinder 9, while the four horizontal control hydraulic cylinders 1 are
0, the relative position of the traverse slide device 6 with respect to the traverse rail device 4 is corrected.

By doing this, when the turret 1 is displaced, the turret 1 can be made vertical by operating the control cylinders 9 and 10, and the soft ground can be treated without leaving untreated areas. This is possible.

When the two left and right crawlers are run using separate oil motor outputs, it is necessary to synchronize the left and right crawlers so that they run at exactly the same speed. Now, if we consider the two crawlers on the left as an example, if the running speeds of each crawler are different, this means that, for example, if two gears of the same diameter have different rotation speeds, the width that spans both gears will change. It is the same as when one gear is meshed, and the gear stops without rotating at all, or one of the gears breaks, and each crawler acts as a braking force, and the crawler's crawler track is damaged. Wear becomes extremely rapid. The same is true when considering the traveling gear on the right side. Therefore, conventionally, the two crawlers on the left side are connected together by one shaft, and two oil motors are used to drive the crawlers. Of course, the same applies to the right side traveling device.

However, even when the method described above is adopted, the following drawbacks occur.

First, it is sufficient if the ground to be improved is at the same height, that is, on the same plane, but this is not possible and if the heights of the ground are not on the same plane, the running speed of both rollers is If they are different, an extremely large displacement force will be applied to the shaft connecting them, and in extreme cases, the shaft will be damaged. Even if the shafts are connected using a universal joint to prevent damage, if the two shafts are not on the same line, the angular velocity of both shafts will naturally change. This means that the running speeds of the crawlers vary from one another, and therefore, as mentioned above, the rate of wear and tear on the crawler tracks is extremely high.

[Means for solving problems]

The present invention has been made for the purpose of solving the problems of the prior art as described above and providing a traveling device for a soft ground treatment machine that can always maintain proper traveling. In the soft ground treatment machine in which the same number of float-type crawler running sections are connected and fixed in parallel at appropriate intervals, the crawler running sections on both sides are individually driven by driving oil motors with the same performance, and The present invention is characterized in that a synchronous control connected oil motor is provided between the oil supply section and the driving oil motor, so that the plurality of driving oil motors are driven in synchronization.

[For production]

Pressure oil is supplied to the driving oil motor that drives the crawler traveling section through the synchronous control connected oil motor, and the driving oil motors are driven synchronously, so the crawler traveling section on the same side always has the same speed. Therefore, the disadvantages caused by the difference in the running speed of the crawlers on the same side are eliminated, and stable ground treatment can be performed.6 [Example] Next, an example of the present invention will be described with reference to the drawings.

Figure 1 is a front view of a soft ground treatment machine with four crawler-type traveling devices, Figure 2 is a side view, Figures 3 and 4
The figure is a hydraulic system diagram for the traveling device of the present invention.

In FIGS. 3 and 4, the left-side running crawlers C1 and C2 are designated as R, and the right-side running crawlers C, , C, and C, are designated as R.

11 in the figure switches the direction of the pressure oil, reverses the rotation direction of the oil motor (described later), and moves the crawler in the running direction (
12.13 Directional switching valve for switching between forward and reverse
．． Reference numerals 14 and 15 are connected oil motors for synchronous control that have the same performance and, in particular, the same volume ratio per rotation, and the oil motors 12 and 13, and 14 and 15 each have their rotational axes X fixed as shown in the figure. be.

17 and 18 are check valves, and 19 and 20 are driving oil motors with the same performance. Fig. 3 shows the speed switching valve 16 in the high speed position, and Fig. 4 shows the same in the low speed position. This shows the state where it has been switched to.

In the state shown in FIG. 3, when the pressure oil directional control valve 11 on the L side is moved to the right and switched, the pressure oil supply section P
The pressure oil supplied from 1 passes through the directional control valve 11 and is supplied to the synchronous control connected oil motor 12.13 to rotate these oil motors 12.13.
The pressure oil passes through 2 and the oil motor 13 passes through the speed switching valve 1.
The pressure oil that has passed through 6 joins together, passes through check valve 17, rotates drive oil motor 19, and further passes through check valve 18. After passing through the passage of the speed switching valve 16 and rotating the driving oil motor 20, the oil flows through the check valve 18 and is divided, and a part of the oil flows through the speed switching valve 1.
6. It passes through the oil motor 14, and the rest is the oil motor 15.
After passing through, it merges and flows from the directional control valve 11 to the pressure oil discharge section T.
It passes through the tank and is released into the tank side circuit. Here, as described above, since the drive oil motors 19 and 20 have the same performance, the two-wheel motors 19 and 20 always rotate at the same rotation speed. That is, the driving oil motors 19 and 20 are connected in series and are operated by one system of pressure oil. Furthermore, if the above is the forward drive of the crawler, then
By switching the direction switching valve 11, the crawler is driven backward.

The above has been described for the L side, but the same applies to the R side, so if the pressure oil is the same on both the L and R sides.

Since the L-side rollers C1, C, and R-side rollers C, and C4 run at the same speed, defects such as wear and damage to the tracks of each crawler are eliminated, and at the same time, even when running on rough terrain, Unreasonable concentration of stress on the fixed portion of the crawler can be eliminated.

Incidentally, the synchronous control connected oil motors 12, 1 in the above
3.14.15 is used as a side unit for equal volume of pressure oil, so it seems unnecessary, but it is necessary to make the speed variable.

Figure 3 shows an example in which the driving oil motors 19 and 20 are rotated at high speed, while Figure 4 shows an example in which the speed switching valve 16 is switched to low speed. The operation will be explained as follows.

In FIG. 4, when the speed switching valve 16 is switched to the low speed side and the direction switching valve 11 is moved to the right in the figure, the pressure oil supply section P
The pressure oil supplied from 1 passes through the directional control valve 11 and is supplied to the synchronous control connected oil motors 12 and 13 to rotate these oil motors 12 and 13, and the pressure oil that has passed through the oil motor 12 is reversed. The drive oil motor 19 is rotated through the check valve 17 and the oil motor 14 is rotated.
The pressure oil that has passed through the oil motor 13 also passes through the check valve 18, rotates the driving oil motor 20, and passes through the check valve 18. The oil flows through the oil motor 15, joins together, passes through the directional control valve 11, the pressure oil discharge section T, and is discharged into the tank side circuit. Here, since the synchronous control connected oil motor and the drive oil motor have the same performance as described above, the drive oil motors 19 and 20 always rotate at the same rotation speed. This operation is the same for both the L side and the R side.

Therefore, even in low-speed driving, the drawbacks of the prior art can be eliminated as in the case of high-speed driving.

Incidentally, the running speed of the crawler can be freely changed by controlling the supply of pressure oil to the pressure oil supply section P shown in FIGS. 3 and 4.

〔Effect of the invention〕

The present invention is as described above, and in order to reduce the ground load per unit area in a traveling device for a soft ground processing machine, each crawler of a processing machine has two or more crawler traveling devices on one side. By always controlling the traveling speed to the same level, it is possible to prevent wear and tear on the crawler tracks caused by differences in traveling speed, and even when traveling on rough terrain, the crawler tracks are always kept in check, especially on the fixed parts of the crawler. This has the effect of eliminating unreasonable concentration of stress. Further, the traveling speed can be easily doubled or halved using the speed switching valve, and the workability thereof is also extremely good.

Therefore, the present invention is suitable as a traveling device for a soft ground treatment machine, particularly a very soft ground treatment machine.

[Brief explanation of the drawing]

FIG. 1 is a front view of an example of a soft ground treatment machine, FIG. 2 is a side view, and FIGS. 3 and 4 are hydraulic system diagrams, showing the case where the speed switching valve is switched to high speed and low speed, respectively. C engineering Cal Cal c4... Crawler, 11.
...Directional switching valve. 12, 13.14.15... Oil motor for synchronous control, 16... Speed switching valve, 17.18... Check valve, 1
9.20... Oil motor for crawler drive, X...
Rotating shaft of oil motor for synchronous control, P□+P2...
Pressure oil supply section, T-work TZ...Pressure oil discharge section Fig. 2

Claims (1)

[Scope of Claims] 1. In a soft ground treatment machine in which two or more float-type crawler running sections of the same number are connected and fixed in parallel at appropriate intervals on both sides, the crawler running sections on both sides are individually arranged with the same performance. The driving oil motor is driven by a driving oil motor, and a synchronous control connecting oil motor is provided between the pressure oil supply section and the driving oil motor, so that the plurality of driving oil motors are driven in synchronization. A traveling device for a soft ground treatment machine characterized by the following. 2. A traveling device for a soft ground treatment machine according to claim 1, wherein a hydraulic switching valve for switching the traveling speed to two stages, high and low, is interposed between the synchronous control connected oil motor and the drive oil motor. .