JPS6156725B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-propelled hydraulic vibration compaction machine that uses a hydraulic oscillator and moves forward and backward while compacting.

The present inventors have investigated the interaction between a spool in a pilot valve that receives constant pressure and alternating pressure from both sides, and a piston spool that receives constant pressure and alternating pressure from both sides in a cylinder. Therefore, we have been developing a self-propelled hydraulic vibration compaction machine in which a pair of hydraulic oscillators that vibrate the pistons are made to vibrate synchronously, and a compaction plate is fixed to the lower end of each piston. Since the direction of inclination of the machine frame body relative to the compaction plate cannot be reversed, the self-propelled direction is constant. Therefore,
In order to reverse the running direction when compacting a deep trench bottom, there is the inconvenience of having to constantly pull the compactor up to the road.

The present invention aims to eliminate the above-mentioned drawbacks, and includes forming a small cylinder inside the spool of each piston in the pair of hydraulic oscillators, and forming a main connecting piston and a sub cylinder in each small cylinder. The heads of the connecting pistons are slidably connected, each connecting piston is slid in opposite directions using a switching valve, and the compaction plate is connected to the lower end of each connecting piston using a universal joint. By reversing the inclination direction of the machine frame body, the machine can move forward and backward while compacting itself.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 3, the self-propelled hydraulic vibration compaction machine of the present invention has a machine frame body 1 which also serves as a load.
and the pilot valve 2, main cylinder 3, and sub cylinder 3' mounted on the machine frame body 1, and the main piston spool 4 and sub piston spool 4' built into each cylinder, and are slidably connected to each piston spool. The main connecting piston 5, the sub connecting piston 5', the switching valve 6, and the lower ends of the main connecting piston 5 and the sub connecting piston 5' are provided with universal joints 8, 8.
The compaction plate 9 is connected to the compaction plate 9. As shown in FIG. 2, the pilot valve 2 includes a spool 21, and a small valve rod 22 and a large valve rod 23 that abut both end surfaces of the spool 21. Reference numeral 24 denotes a supply/discharge chamber consisting of an annular groove formed in the center of the spool 21. 25 and 26 are the small valve stem 22 and the large valve stem 23
They are a constant pressure chamber and an alternating pressure chamber, into which pressure oil is introduced through communication holes 25' and 26', respectively, at the end faces of the chamber.
An annular oil supply groove 27 is provided on the inner surface of the vessel wall of the pilot valve 2.
, opposed communication holes 28 and 28', and an annular oil drainage groove 29 are provided. When the spool 21 slides downward as shown in FIG. ' communicates with the annular oil drain groove 29,
The annular oil supply groove 27 and the communication holes 28, 28' are designed to communicate with each other via the supply/discharge chamber 24 when the spool 21 slides upward as shown in FIG. In FIG. 4, the main connecting piston 5 is provided with a main head portion 51 consisting of an enlarged diameter portion at its upper end. The main head portion 51 is slidably connected within a small cylinder 45 formed inside the main piston spool 4. Reference numerals 48 and 49 are a main adjustment pressure chamber and a constant pressure chamber, which are formed above and below the main head portion 51 in the small cylinder 45, respectively.
The main piston spool 4 has a small diameter part 41 and a large diameter part 42.
and a medium diameter portion 43. 44 is the large diameter portion 42
This is the reduced diameter part formed in the 46 is a small cylinder 45
47 is a communication hole that opens at the top of the small cylinder 45 . The inner diameters of the upper, middle, and lower parts of the main cylinder 3 are formed into a small diameter part, a large diameter part, and a medium diameter part, respectively, so as to match the outer shape of the main piston spool 4. The shape is adapted to the vibration amplitude. 37 and 39 are the main cylinder 3 respectively
Inside, an alternating pressure chamber and a constant pressure chamber are formed above and below the large diameter portion 42 of the main piston spool 4, and 38 is the reduced diameter portion 4 of the main piston spool 4.
This is a communication chamber formed around 4. The side wall of the main cylinder 3 has, in order from the top, a communication hole e and a communication hole 31 that open to the inner surface of the small diameter part, and an alternating pressure chamber 37.
A communication hole 32 that opens at the top of the large diameter portion, and an oil drain hole 33 and a communication hole 34 that open at the inner surface in the middle of the large diameter portion.
An oil supply hole 35 that opens at the lower part of the constant pressure chamber 39 and a communication hole f that opens at the inner surface of the medium diameter portion are provided. g
and 36 are annular grooves formed in the portions where the communication hole e and the communication hole 31 open to the inner surface of the small diameter portion, respectively. h
is an annular groove formed in a portion where the communication hole f opens to the inner surface of the medium diameter portion. Reference numeral 40 denotes an air communication passage that communicates the upper end of the small diameter portion of the main cylinder 3 with the lower end of the medium diameter portion. As shown in Fig. 3 and Fig. 4, the oil supply hole 3
5 is always in communication with the constant pressure chamber 49 in the small cylinder 45 via the constant pressure chamber 39 and the communication hole 47, and when the main piston spool 4 slides downward as shown in FIG. Oil drain hole 3 via chamber 38
3, and when the main piston spool 4 slides upward as shown in FIG. 46 to communicate with the main regulating pressure chamber 48 .
In FIG. 3, a and b are diameter-reducing steps formed at the upper and lower ends of the large diameter portion 42 of the main piston spool 4, respectively, and c and d are the upper and constant pressure sections of the alternating pressure chamber 37, respectively. This is a brake chamber formed in the lower part of the chamber 39. When the main piston spool 4 vibrates, the brake chambers c and d are alternately closed by the diameter-reducing steps a and b, so that a braking action is produced.

As shown in FIG. 4, the sub-cylinder 3' is the same as the main cylinder 3 except for the oil drain hole 33 and the communication hole 34, and the sub-piston spool 4' is the same as the main piston spool 4 except for the reduced diameter part 44. The sub-connecting piston 5' is similar to the main connecting piston 5, and the same parts are indicated by the same reference numerals and dashes in the drawings, such as 3', 4', and 5'.

In FIGS. 3 and 4, the switching valve 6 is provided with a handle 61. As shown in FIGS. 62 is a main pressure regulation hole, 63 is an oil drain hole, 64 is an oil supply hole, and 65 is a sub pressure regulation hole. When the handle 61 is placed upright as shown in FIG. 1, the main pressure regulation hole 62 and the sub pressure regulation hole 65 are both communicate with the oil drain hole 63, and the handle 6 as shown in FIG.
1 to the right, the main pressure adjustment hole 62 and oil drain hole 63 communicate with each other, and the oil supply hole 64 and sub pressure adjustment hole 65 communicate with each other, and as shown in FIG. 4, the handle 61
It is designed so that when it is turned to the left, the main pressure regulating hole 62 and the oil supply hole 64 communicate with each other, and the oil drain hole 63 and the sub pressure regulating hole 65 communicate with each other. In Figure 4,
66 is an oil supply pipe connection port, and 67 is an oil drain pipe connection port. Reference numeral 71 denotes a supply oil passage, which connects the oil supply pipe connection port 66 to the oil supply hole 64 of the switching valve 6 and the pilot valve 2.
The communication hole 25' to the constant pressure chamber 25 of the pilot valve 2 communicates with the annular oil supply groove 27 of the pilot valve 2, and the oil supply hole 35 of the main cylinder 3. is connected to.
Reference numeral 72 is a drain oil passage, which communicates the drain oil pipe connection port 67 with the drain oil hole 63 of the switching valve 6 and the annular oil drain groove 29 of the pilot valve 2, and also connects the annular oil drain groove 29
It communicates with the oil drain hole 33 of the main cylinder 3 through. 73 is a main piston hydraulic oil passage, which connects the communication hole 28 of the pilot valve 2 to the communication hole 3 of the main cylinder 3.
It is connected to 2. Reference numeral 73' denotes a sub-piston hydraulic oil passage, which communicates the communication hole 28' of the pilot valve 2 with the communication hole 32' of the sub-cylinder 3'. 7
4 is a main regulating oil passage, which is connected to the main pressure regulating hole 6 of the switching valve 6.
2 is communicated with a communication hole 31 of the main cylinder 3.
Reference numeral 74' denotes a sub-regulating oil passage, which communicates the sub-pressure regulating hole 65 of the switching valve 6 with the communication hole 31' of the sub-cylinder 3'. Reference numeral 75 is a pilot spool hydraulic oil passage, which communicates the communication hole 26' of the pilot valve 2 to the alternating pressure chamber 26 with the communication hole 34 of the main cylinder 3. Reference numerals 76 and 76' are return oil passages, which are connected to communication holes e and f, respectively, as shown by dotted lines.
e' and f' are communicated with the discharge oil passage 72. The universal joint 8 includes a pair of spring receivers 8 that are in contact with both the upper and lower surfaces of a go stone-shaped collar 52 formed at the lower end of each connecting piston.
1, 82, a pair of springs 83, 84 that press the spring receivers 81, 82 against the go stone-shaped collar 52, the collar 52,
It includes spring receivers 81 and 82 and a spring tube 85 that accommodates springs 83 and 84. A compacting plate 9 is attached to the lower end of the spring cylinder 85, and the main connecting piston 5
The sub-connection piston 5' can be tilted in any direction relative to the compaction plate 9 by means of universal joints 8, 8.

In the self-propelled hydraulic vibration compaction machine of the present invention configured as described above, the oil supply pipe connection port 66 is connected to a hydraulic power source (not shown), the oil drain pipe connection port 67 is connected to a tank (not shown), and the oil pressure When pressure oil is supplied from the source to the supply oil line 71 through the oil supply pipe connection port 66, the pressure oil is supplied to the constant pressure of the pilot valve 2 through the communication hole 25' and the oil supply holes 35 and 35', respectively, as shown in FIG. It flows into the chamber 25, the constant pressure chamber 39 of the main cylinder 3, and the constant pressure chamber 39' of the sub cylinder 3', and the spool 21 of the pilot valve 2 is pressed by the small valve rod 22 and slides downward, and the main The main piston spool 4 of the cylinder 3 and the sub-piston spool 4' of the sub-cylinder 3' each begin to slide upward. At this time, the alternating pressure chamber 37 of the main cylinder 3 is connected to the communication hole 32, the main piston hydraulic oil passage 73, and the communication hole 2.
8, the supply/discharge chamber 24, the annular oil drain groove 29, and the drain oil passage 7
2 and a drain oil pipe connection port 67 to a tank (not shown). Similarly, the alternating pressure chamber 37' of the sub-cylinder 3' is connected to the communication hole 32' and the sub-piston hydraulic oil passage 7.
3', the communication hole 28', the supply/drainage chamber 24, and the annular oil drainage groove 2
9, a drain oil passage 72, and a drain oil pipe connection port 67 to communicate with a tank (not shown). In FIG. 4, in the process of upward sliding of the main piston spool 4, the oil supply hole 35 and the communication hole 3 are connected via the constant pressure chamber 39.
The pressure oil introduced into the constant pressure chamber 39 from the oil supply hole 35 flows into the alternating pressure chamber 26 of the pilot valve 2 through the communication hole 34, the pilot spool hydraulic oil passage 75, and the communication hole 26'. . Large valve rod 2
3 has a larger pressure-receiving area than the small valve stem 22, so the large valve stem 23 slides the spool 21 upward against the pressing force of the small valve stem 22. When the spool 21 slides upward, it passes through the annular oil supply groove 2 through the supply and discharge chamber 24.
7 and the communication holes 28 and 28' communicate with each other, and pressure oil flows from the communication hole 28 of the pilot valve 2 through the main piston hydraulic oil passage 73 and the communication hole 32 into the alternating pressure chamber 37 of the main cylinder 3, and also communicates with each other. hole 28'
The oil then flows into the alternating pressure chamber 37' of the sub-cylinder 3' via the sub-piston hydraulic oil passage 73' and the communication hole 32'. Since the pressure receiving area of the main piston spool 4 in the alternating pressure chamber 37 is larger than the pressure receiving area of the main piston spool 4 in the constant pressure chamber 39, the main piston spool 4 begins to slide downward. Similarly, the sub-piston spool 4' begins to slide downward. Next, as shown in FIG. 3, in the process of downward sliding of the main piston spool 4, the oil drain hole 33 and the communication hole 34 communicate with each other through the communication chamber 38, thereby causing the pilot The alternating pressure chamber 26 of the valve 2 is connected to the communication hole 26', the pilot spool hydraulic oil passage 75, the communication hole 34, the communication chamber 38, and the oil drain hole 3.
The spool 21 of the pilot valve 2 is connected to a tank (not shown) through an annular oil drain groove 29 and a drain oil pipe connecting port 67, and the pressure inside the alternating pressure chamber 26 decreases. Pressure oil is applied to the small valve rod 22, which slides downward, and then, as described above, the alternating pressure chamber 37 of the main cylinder 3 and the alternating pressure chamber 37' of the sub-cylinder 3' are opened as shown in the figure. In communication with the outer tank, the main piston spool 4 and the sub-piston spool 4' each have a constant pressure chamber 39.
It is pressed by the pressure oil constantly introduced into the constant pressure chamber 39' and slides upward. When the main piston spool 4 and the sub-piston spool 4' vibrate, they slide upward and are formed at the upper ends of the large diameter parts 42, 42', as shown in FIG. The brake chamber c above the alternating pressure chambers 37, 37'
c', the oil is confined in the brake chambers c, c' and produces a braking action, and the pressure oil supplied from the communication holes 32, 32' by reversing the spools 21 of the pilot valves 2 in succession It acts on the pressure receiving surface between the large diameter portions 42, 42' and the reduced diameter step portions a, a' to quickly slide the main piston spools 4, 4' downward. Similarly, piston spool 4,
As shown in FIG. room d,
d', the oil is trapped in the brake chambers d and d' to produce a braking action, and the reversal of the spools 21 of the pilot valves 2 successively causes the communication holes 32 and 32' to communicate with the discharge oil path 72. The pressure oil supplied from the oil supply holes 35, 35' is supplied to the large diameter portion 4.
2, 42' and the diameter-reducing stepped portions b, b' to quickly slide the piston spools 4, 4' upward. Since the weights of the main piston spool 4 and the sub-piston spool 4' and the pressure receiving areas in the alternating pressure chambers 37, 37' and constant pressure chambers 39, 39' are also equal, the main piston spool 4 and the sub-piston spool 4' are equal in weight. The amplitudes are equal.

As described above, the spool 2 of the pilot valve 2
1 and the main piston spool 4 in the main cylinder 3 to cause the main connecting piston 5 connected to the main piston spool 4 to vibrate,
The sub-connection piston 5' connected to the sub-piston spool 4' in the sub-cylinder 3' is vibrated synchronously with the main connection piston 5, and a universal joint 8 is installed at the lower ends of the main connection piston 5 and the sub-connection piston 5'. ，
Compaction is performed by compaction plates 9 connected at 8. Furthermore, pressure oil always flows into the constant pressure chamber 49 in the small cylinder 45 via the supply oil passage 71, the oil supply hole 35, and the communication hole 47, and the oil supply passage 71 and the oil supply hole 35 through the annular oil supply groove 27. ' and the constant pressure chamber 4 in the small cylinder 45' through the communication hole 47'.
9', the main head portion 51 of the main connecting piston 5 and the sub head portion 5 of the sub connecting piston 5'.
1' are both pushed upward. As shown in FIG. 1, when the handle 61 of the switching valve 6 is upright, both the main pressure regulating hole 62 and the sub pressure regulating hole 65 communicate with the oil drain hole 63, and the main pressure regulating hole 62 and the sub pressure regulating hole 65 communicate with the oil drain hole 63. Since pressure oil is not introduced into either the adjustment pressure chamber 48 or the sub-adjustment pressure chamber 48' in the small cylinder 45', both head sections 51, 51' remain pushed upward, and the machine frame Since the main body 1 is not inclined with respect to the compaction plate 9, it does not move on its own while compacting. To make it self-propelled, as shown in FIG.
6' are in communication with the annular grooves 36 and 36', respectively, and when the handle 61 of the switching valve 6 is tilted, for example, to the left, the sub pressure regulating hole 65 and the oil drain hole 63 communicate with each other, and the main adjustment Pressure hole 62 and oil supply hole 64
By communicating with the sub-adjustment pressure chamber 4
8' is a communication hole 46', an annular groove 36', a communication hole 31', a sub-adjustment oil passage 74', a sub-pressure adjustment hole 65, and an oil drain hole 6'.
3, a drain oil passage 72, and a drain oil pipe connection port 67 to a tank (not shown), the subhead portion 51' is pushed upward as shown in FIG. At the same time, the pressure oil in the supply oil path 71 is transferred to the oil supply hole 64, the main adjustment pressure hole 62, the main adjustment oil path 74, and the communication hole 3.
1, the annular groove 36 and the communication hole 46 into the main adjustment pressure chamber 48 . Since the pressure receiving area of the main head part 51 in the main adjustment pressure chamber 48 is larger than the pressure receiving area of the main head part 51 in the constant pressure chamber 49,
The main head portion 51 is pushed downward against the upward force of the pressure oil constantly flowing into the constant pressure chamber 49, resulting in the state shown in FIG. As a result, the sub-connection piston 5' is pushed upward, the main connection piston 5 is pushed downward, and the machine frame body 1 is moved downward to the left with respect to the compaction plate 9, as shown in FIG. Because it leans toward the left, it can move to the left while compacting. Contrary to the above, when the handle 61 of the switching valve 6 is turned to the right as shown in FIG.
8', the main adjustment pressure chamber 48 communicates with a tank (not shown), and the machine frame body 1 is tilted downward to the right with respect to the compaction plate 9 as shown in FIG. It is possible to drive to.

Note that the number of main hydraulic oscillation devices and sub-hydraulic oscillation devices attached to the compaction plate is not limited to one each as in the illustrated embodiment; Divide the plate into two, attach a pair of main hydraulic oscillators to one compaction plate, and a pair of sub-hydraulic oscillators to the other compaction plate, and use a pilot valve to synchronously vibrate the four connected pistons. In addition, pressure oil may be supplied and discharged to and from the main head portions of the pair of main connection pistons and the subhead portions of the pair of sub connection pistons using a switching valve. Pressure oil that leaked into the sliding parts between the small and medium diameter parts of the piston spool and the cylinder during the compaction work does not spray out into the air communication passages 40, 40', but instead flows into the annular grooves g, g', h, h. Since the pressure oil returns to the tank (not shown) through the communication holes e, e', f, f', the return oil passages 76, 76', and the discharge oil passage 72, the pressure oil does not leak to the outside.

As can be easily understood from the above explanation,
The present invention provides a main head section that connects a main connecting piston within a small cylinder of a main piston spool and a subhead section that connects a sub connecting piston within a small cylinder of a sub piston spool by operating a handle of a switching valve. By sliding the parts alternately in opposite directions, the inclination direction of the machine frame body relative to the compaction plate can be arbitrarily adjusted to the left or right, so it can move freely forward and backward while compacting.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a sectional view of a pilot valve,
Figure 3 is a vertical cross-sectional view showing the self-propelled adjustment state in the right direction, with constant pressure acting on the spool in the pilot valve and each piston spool, and Figure 4 is the self-propelled adjustment state in the left direction. FIG. 3 is a longitudinal cross-sectional view showing a state in which the engine is in a running adjustment state and in which alternating pressure is applied to the spool in the pilot valve and each piston spool. 1: Machine frame body, 2: Pilot valve, 3: Main cylinder, 3': Sub cylinder, 4: Main piston spool, 4': Sub piston spool, 5: Main connecting piston, 5': Sub connecting piston, 6: Switching valve, 8: Universal joint, 9: Compaction plate, 21: Spool, 22: Small valve stem, 23: Large valve stem, 24: Supply/discharge chamber, 25: Constant pressure chamber, 25': Communication hole, 26 :
Alternating pressure chamber, 26': Communication hole, 27: Annular oil supply groove, 28, 28': Communication hole, 29: Annular oil drain groove,
31, 31': Communication hole, 32, 32': Communication hole, 3
3: oil drain hole, 34: communication hole, 35, 35': oil supply hole, 36, 36': annular groove, 37, 37': alternating pressure chamber, 38: communication chamber, 39, 39': constant pressure chamber,
40, 40': air communication path, 41, 41': small diameter section, 42, 42': large diameter section, 43, 43': medium diameter section, 44: reduced diameter section, 45, 45': small cylinder,
46, 46': Communication hole, 47, 47': Communication hole, 4
8: Main adjustment pressure chamber, 48': Sub adjustment pressure chamber, 4
9, 49': constant pressure chamber, 51: main head section, 5
1': Subhead part, 52: Go stone-shaped collar, 61: Handle, 62: Main pressure adjustment hole, 63: Oil drain hole, 64:
Oil supply hole, 65: Sub pressure regulation hole, 66: Oil supply pipe connection port, 67: Oil drain pipe connection port, 71: Supply oil path, 7
2: Discharge oil path, 73: Main piston hydraulic oil path, 7
3': Sub-piston hydraulic oil passage, 74: Main adjustment oil passage, 74': Sub-adjustment oil passage, 75: Pilot spool hydraulic oil passage, 76, 76': Return oil passage, 8
1, 82: Spring receiver, 83, 84: Spring, 85: Spring tube, a, a', b, b': Diameter reduction step, c, c', d,
d': Brake chamber, e, e', f, f': Communication hole, g,
g', h, h': annular groove.

Claims (1)

[Claims] 1 The machine frame body is equipped with a main cylinder with a built-in main piston spool, a sub-cylinder with a built-in sub-piston spool, and a pilot valve, and the main connecting piston and sub-piston are installed in small cylinders formed inside each piston spool. The heads of the connecting pistons are slidably connected, and a compaction plate is connected to the lower end of each connecting piston using a universal joint, allowing interaction between the pilot valve spool and the main piston spool in the main cylinder. Thus, the main connecting piston is vibrated and the sub connecting piston is made to vibrate synchronously with the main connecting piston, thereby forming a main adjusting pressure chamber and a sub adjusting pressure chamber facing the upper end surface of the head of each connecting piston. At the same time, a constant pressure chamber is formed facing the lower end surface of the head of each connecting piston, and a switching valve alternately supplies and discharges pressure oil to and from the main adjustment pressure chamber and the sub-adjustment pressure chamber. A self-propelled type characterized in that by slidingly adjusting the sub-connection piston in the opposite direction, the machine frame body is tilted with respect to the compaction plate so that it can move forward and backward while compacting. Hydraulic vibratory compaction machine.