JPS5828016Y2 - hydraulic rammer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic ramp using a hydraulic oscillator that vibrates a hydraulic piston through interaction between a spool and a hydraulic piston.

The conventional Run 7 has a structure in which the weight of the main body is loaded onto a compaction plate, and the compaction plate is moved up and down via a crank using an engine attached to the main body to compact the ground by impact, but this structure is directly driven by the engine. Number of blows (500 to 6 per minute)
00 times, and the compaction force is weak considering its size.

Furthermore, it was impossible to adjust the optimal number of blows and compaction force depending on the soil quality.

The present invention aims to eliminate these drawbacks and provide a hydraulic ramp that is compact and powerful and uses a hydraulic oscillator, which can perform optimal compaction for any type of soil.

Embodiments will be described below with reference to figures showing examples.

In FIG. 1, a hydraulic oscillator 3 that vibrates the hydraulic piston 2 through interaction between the spool 1 and the hydraulic piston 2 is loaded with a hydraulic power source 8 comprising an engine 4, a pump 5, a regulating valve 6, a tank 7, etc. A compaction plate 9 is provided at one end of the hydraulic piston 2.

Further, as shown in FIG. 2, if hydraulic pressure can be easily supplied through the hose 11 from a hydraulic power source (not shown) of a hydraulic machine at the work site, a balance weight 10 may be loaded in place of the hydraulic power source 8 and the hydraulic ramp Configure.

FIG. 3 shows a cross section of the hydraulic oscillator 3 shown in FIGS.
The directional switching valve 12 provided on one wall of the spool 1
A large-diameter valve stem 14 and a small-diameter valve stem 15 that actuate the spool 1 are brought into contact with both end surfaces of the spool 1, so that an alternating hydraulic pressure is applied to the valve stem 14. It has an oil chamber 17 that constantly loads high-pressure oil pressure to the chamber 16 and the valve stem 15, and a supply/discharge chamber 18 consisting of an annular groove in the middle of the spool 1. A supply pressure port 20 to which low-pressure oil is supplied and a discharge port 21 to discharge low-pressure oil are opened on the sliding surface of the spool 1, and the supply and discharge chamber 18 is opened to the supply pressure port 20 and the discharge port 21 by the operation of the spool 1. Alternately operating port 1
9 to generate alternating hydraulic pressure in the operating port 19, and the hydraulic cylinder 13 is constantly loaded with high-pressure hydraulic pressure formed by the hydraulic piston 2, which is slidably provided, and the hydraulic piston 2 and the cylinder liner 22. An oil chamber 23 having a small pressure-receiving area to load the oil chamber 23, an oil chamber 24 facing the oil chamber 23 and having a large pressure-receiving area to load the alternating hydraulic pressure generated in the operating port 19, and an annular groove in the middle of the hydraulic piston 2. A pilot port 26 that communicates with the oil chamber 16 and a discharge port 2 that discharges oil.
7 is opened on the inner circumferential surface of the cylinder liner 22, and the pilot port 26 communicates with the oil chamber 23 at the working end of the hydraulic piston 2 and communicates with the discharge port 27 via the communication chamber 25 at the other working end. A supply port 28 and a tank port 29 connected to the hydraulic pressure source are provided on one wall of the hydraulic cylinder 13, and high-pressure oil supplied from the hydraulic source is supplied to the oil chamber 17 and the oil chamber 16 through the supply port 28. An oil passage is provided to discharge oil supplied to the chamber 23 and the pressure supply port 20 and discharged to the hydraulic source from the discharge port 21 and the discharge port 27 via the tank port 29.

In the hydraulic oscillator 3 shown in FIG. 3 having such a configuration, by supplying pressure oil from the hydraulic source 8 or the hose 11, the pressure oil flows from the supply port 28 into the oil chamber 17, the oil chamber 23, and the pressure supply port 20. , the spool 1 is pushed by the valve stem 15 by the hydraulic pressure in the oil chamber 17 and lowers a little, and the spool 1
A wandering chamber 18 consisting of an annular groove in the middle communicates the operating port 19 and the discharge port 21, the hydraulic piston 2 rises due to the hydraulic pressure in the oil chamber 23, and the oil filled in the oil chamber 24 changes direction. It is discharged via valve 12.

When the hydraulic piston 2 rises and the oil chamber 23 and pilot port 26 communicate with each other, pressure oil flows into the oil chamber 16 and the valve stem 14
Due to the pressure receiving area difference between the valve stem 15 and the valve stem 15, the spool 1 is pushed by the valve stem 14 and rises, the pressure supply port 20 and the operating port 19 communicate through the supply/discharge chamber 18, and the pressure oil flows into the oil chamber 24. do.

Due to the difference in pressure receiving area between the oil chamber 23 and the oil chamber 24, the hydraulic piston 2 moves downward against the hydraulic pressure of the oil chamber 23.

When the hydraulic piston 2 descends and the pilot port 26 and the discharge port 27 communicate with each other via the communication chamber 25, the oil chamber 16
The hydraulic pressure in the spool 1 disappears, and the hydraulic pressure in the oil chamber 17 causes the spool 1 to
is pushed down by the valve stem 15, the operating port 19 and the discharge port 21 communicate with each other via the supply/discharge chamber 18, the hydraulic pressure in the oil chamber 24 disappears, and the hydraulic piston 2 returns to the oil in the oil chamber 23. Increases due to pressure.

In this way, if pressure oil is supplied, spool 1 and hydraulic piston 2
Due to the interaction, when the pressure in the oil chamber 16 becomes high, the pressure in the oil chamber 24 becomes high, and when the pressure in the oil chamber 16 becomes low, the pressure in the oil chamber 24 also becomes low, causing the hydraulic pitsun 2 to vibrate.

Thus, as shown in FIG. 1, the weight of the hydraulic source 8 is loaded onto the compaction plate 9 provided at one end of the hydraulic piston 2, pressing it against the ground 30.

Next, by driving the hydraulic source 8 and supplying the hydraulic oil whose pressure flow rate is adjusted by the regulating valve 6 to the hydraulic oscillator 3, the hydraulic piston 2 is activated by the interaction between the spool 1 and the hydraulic piston 2 as described above. Vibrating, the compaction plate 9 provided at one end of the hydraulic piston 2 compacts the ground 30 by impact.

On the other hand, as shown in Fig. 2, by supplying pressure oil from the hydraulic source of the hydraulic machine through the hose 11 at the work site,
The compaction plate 9 loaded with the weight of the balance weight 10 compacts the ground 30 by impact as the hydraulic piston 2 vibrates due to the interaction between the spool 1 of the hydraulic oscillator 3 and the hydraulic piston 2, as described above.

As is clear from the above-mentioned operation, the compaction force applied to the compaction plate and the number of blows can be easily adjusted by adjusting the pressure and flow rate of the pressure oil supplied from the hydraulic source. , it is possible to perform optimal compaction according to the ground contact area of the compaction plate, and because of its small size, it has effects such as being able to compact narrow and deep groove bottoms that were previously impossible.

[Brief explanation of the drawing]

FIG. 1 is a front view of a hydraulic lamp according to the present invention, FIG. 2 is a front view showing another embodiment of the hydraulic lamp, and FIG. 3 is a sectional view showing an example of a hydraulic oscillator used in the present invention. . 1...Spool, 2...Hydraulic piston, 3...Hydraulic oscillator, 4...Engine, 5...Pump, 6... ...Adjustment valve, 7.
... Tank, 8 ... Hydraulic power source, 9 ...
・Compaction plate, 10 ・・・Balance weight, 1
1... Hose, 12... Directional switching valve,
13... Hydraulic cylinder, 14... Valve stem, 15... Valve stem, 16... Oil chamber, 17
... Oil room, 18 ... Supply and discharge room, 19 ...
...Operating port, 20...Pressure port, 2
1... Discharge port, 22... Cylinder liner, 23... Oil chamber, 24... Oil chamber, 25... Communication chamber, 26... Pilot port, 27... Discharge port.

Claims (3)

[Scope of utility model registration request] (1) A hydraulic source 8 is loaded on a hydraulic oscillator 3 that vibrates the hydraulic piston 2 through interaction between the spool 1 and the hydraulic piston 2, and a compaction plate 9 is provided at one end of the hydraulic piston 2. Hydraulic ramp. (2) The hydraulic lamp according to claim 1, which is a registered utility model, characterized in that a balance weight 10 is loaded in place of the hydraulic power source 8. (3) The hydraulic oscillator 3 is composed of a directional control valve 12 and a hydraulic cylinder 13. The directional control valve 12 has the spool 1 slidably built therein, and a large-diameter valve rod 14 for actuating the spool 1. Each of the small-diameter valve rods 15 is brought into contact with both end surfaces of the spool 1, and an oil chamber 16 for applying alternating oil pressure to the valve rod 14, an oil chamber 17 for constantly applying high-pressure oil pressure to the valve rod 15, and the spool 1. The spool has a supply/discharge chamber 18 formed of an annular groove in the middle, an operating port 19 constantly communicating with the supply/discharge chamber 18, a supply pressure port 20 to which high-pressure oil is supplied, and a discharge port 21 to discharge low-pressure oil from the spool. When the spool 1 operates, the supply/discharge chamber 18 alternately connects the supply pressure port 20 and the discharge port 21 to the operating port 1.
9 to generate alternating hydraulic pressure in the operating port 19, and the hydraulic cylinder 13 is constantly loaded with high-pressure hydraulic pressure formed by the hydraulic piston 2, which is slidably provided, and the hydraulic piston 2 and the cylinder liner 22. an oil chamber 23 having a small pressure-receiving area to load the oil chamber 23, an oil chamber 24 facing the oil chamber 23 and having a large pressure-receiving area to load the alternating hydraulic pressure generated in one of the operating ports; A pilot port 26 that communicates with the oil chamber 16 and a discharge port 27 that discharges oil are opened on the inner peripheral surface of the cylinder liner 22, and the pilot port 26 has a communication chamber 25 formed of a groove. One end communicates with the oil chamber 23 and the other operating end communicates with the discharge port 27 via the communication chamber 25 to supply alternating hydraulic pressure to the oil chamber 16, and the interaction between the spool 1 and the hydraulic piston 2 causes the hydraulic piston to 2. A hydraulic lamp according to claim 1 or 2, characterized in that the lamp is configured to vibrate.