JPS6128044B2 - - 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 a liner that is slidably disposed between each piston and cylinder in the pair of hydraulic oscillators, and a switching valve that connects each liner. By sliding the pistons in opposite directions and adjusting the vibration position of each piston, the direction of inclination of the machine frame body relative to the compaction plate connected to the lower end of each piston with a universal joint can be reversed. By doing so, it can move forward and backward while compacting itself.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The self-propelled hydraulic vibratory compaction machine of the present invention includes:
As shown in Figures 1 and 2, there is a machine frame body 1 that also serves as a load, a pilot valve 2 attached to the machine frame body 1, a main cylinder 3, a sub cylinder 3', and a main piston attached to each cylinder. 4. Sub-piston 4'
, a main liner 5, a subliner 5', and a switching valve 6, which are slidably arranged between each cylinder and the piston.
and a compaction plate 9 connected to the lower ends of the main piston 4 and sub-piston 4' by universal joints 8, 8. In FIG. 2, the pilot valve 2 includes a spool 21, and a small valve stem 22 and a large valve stem 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 small valve stems 2
2 and the large valve stem 23 are provided with a communication hole 25' on the end face, respectively.
and 26', into which pressure oil is introduced, are a constant pressure chamber and an alternating pressure chamber. An annular oil supply groove 27 and opposing communication holes 28, 28' are provided on the inner surface of the vessel wall of the pilot valve 2.
An annular oil drain groove 29 is provided, and the spool 2
1 slides downward as shown in FIG.
When the spool 21 slides upward as shown in FIG. 3, the annular oil supply groove 27 and the communication holes 28, 28' communicate with each other through the supply and discharge chamber 24. An upper fixed liner 51 and a lower fixed liner 52 are attached to the upper and lower parts of the main cylinder 3, respectively, and the main liner 5 is slidably arranged between the liners 51 and 52. 31 is a main adjustment pressure chamber formed between the upper fixed liner 51 and the main liner 5 in the main cylinder 3;
2 is a main constant pressure chamber formed between the main liner 5 and the lower fixed liner 52. A communication hole 33 that communicates with the main adjustment pressure chamber 31 and an oil supply hole 38 that communicates with the constant pressure chamber 32 are provided in the upper and lower parts of the side wall of the main cylinder 3, respectively, and the main piston 4 that slides within the main liner 5 is provided. The oil holes for supplying and discharging pressure oil to the spool 41 are located between the communication hole 33 and the oil supply hole 38, and are arranged in order from the top: a communication hole 34, an oil drain hole 35,
A communication hole 36 and an oil supply hole 37 are provided. Upper fixed liner 51, main liner 5, and lower fixed liner 5
The inner diameters of the main liner 2 and the main liner 5 are formed into a small diameter, a large diameter, and a medium diameter, respectively, to match the outer shape of the spool 41 at the upper end of the main piston 4, and the main liner 5 is formed into a shape that adapts to the vibration amplitude of the spool 41. , a small diameter hole is formed in its upper end wall, and a medium diameter hole is formed in its lower end wall. In FIG. 3, the upper spool 41 of the main piston 4 has a small diameter portion 42 that slides inside the upper end wall of the main liner 5 and the upper fixed liner 51, and a large diameter portion that slides inside the main liner 5. 43, and a medium diameter portion 44 that slides within the medium diameter hole of the lower end wall of the main liner 5 and the lower fixed liner 52. A medium diameter portion 44 extends downwardly from the lower fixed liner 52 to form the main piston 4 . 45
is a reduced diameter portion formed in the large diameter portion 43. Inside the main liner 5, alternating pressure chambers 46 are located above and below the large diameter portion 43 of the spool 41 (see FIG. 4).
A constant pressure chamber 47 is formed, and a communication chamber 48 is formed around the reduced diameter portion 45. Communication holes 53 are provided in the upper, middle, and lower parts of the side wall of the main liner 5, each communicating with the upper part of the alternating pressure chamber 46 in order from above.
(see FIG. 4), an oil drain hole and a communication hole 55,
An oil supply hole 56 communicating with the lower part of the constant pressure chamber 47 is provided. Annular grooves 57, 58, 59, and 60 are formed in the portions where these oil holes 53, 54, 55, and 56 open on the outer surface of the main liner 5, respectively. The oil holes 53 to 56 are oil holes 3 provided in the main cylinder 3, respectively.
4 to 37. When the spool 41 of the main piston 4 slides downward as shown in FIG. 2, the oil drain hole 54 and the communication hole 55 communicate with each other via the communication chamber 48, and the spool 41 slides upward as shown in FIG. It is designed so that the communication hole 55 and the oil supply hole 56 communicate with each other via the constant pressure chamber 47 when sliding. Furthermore, as shown in FIGS. 3 and 4, diameter-reducing step portions a and b are formed at the upper and lower ends of the large diameter portion 43 of the spool 41, respectively, and the upper and lower ends of the alternating pressure chamber 46 are Brake chambers c and d are provided at the lower end of the pressure chamber 47, respectively.

The sub-cylinder 3' is the same as the main cylinder 3 except for the oil drain hole 35 and the communication hole 36, as shown in FIG. The subliner 5' is the same as the main piston 4 except for the oil drain hole 54, the communication hole 55, and the annular grooves 58 and 59 as shown in FIG. is 3',
Identical parts such as 4' and 5' are marked with the same symbols and dashes. In FIGS. 2 and 3, 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 36 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 when the handle 61 is tilted to the right as shown in FIG. are in communication with each other, and when the handle 61 is tilted to the left as shown in FIG. ing.
In FIG. 2, 66 is a fuel supply pipe connection port;
7 is an oil drain pipe connection port. Reference numeral 71 is a supply oil passage, and the oil supply pipe connection port 66 is connected to the oil supply hole 64 of the switching valve 6.
and the communication hole 2 of the pilot valve 2 to the constant pressure chamber 25.
5', the annular oil supply groove 27 of the pilot valve 2, and the oil supply holes 37 and 38 of the main cylinder 3, as well as the annular oil supply groove 27 and the oil supply holes 37' and 38' of the sub cylinder 3'. ing.
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 hole 29.
It communicates with the oil drain hole 35 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 4. 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 34' 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 33 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 33' 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 36 of the main cylinder 3. In FIG. 3, e and f are annular grooves formed on the inner surfaces of the small diameter part and the medium diameter part of the main liner 5, respectively, and the communicating holes g,
h, the annular grooved communication holes 39 and 40 formed in the main cylinder 3, and the discharge oil passage 72 via the return oil passage 76.
is connected to. As shown in FIG. 3, the universal joint 8 includes a pair of spring receivers 81 and 82 that are in contact with both the upper and lower surfaces of a go stone-shaped collar 49 formed at the lower end of each piston.
, a pair of springs 83 and 84 that press the spring receivers 81 and 82 against the go stone-shaped collar 49, the collar 49, and the spring receiver 8.
1, 82, spring tube 85 housing springs 83, 84
It is equipped with A compacting plate 9 is attached to the lower end of the spring cylinder 85, and the main piston 4 and sub-piston 4' are connected to the compacting plate 9 by a universal joint 8 so that they can be tilted in any direction. .

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 37 and 37', respectively, as shown in FIG. It flows into the chamber 25, the constant pressure chamber 47 of the main liner 5, and the constant pressure chamber 47' of the subliner 5', and the spool 21 of the pilot valve 2 is pressed by the small valve rod 22 and slides downward, and the main cylinder The main piston 4 of No. 3 and the sub-piston 4' of sub-cylinder 3' each begin to slide upward. At this time, the alternating pressure chamber 46 of the main liner 5 is connected to the communication hole 53, the annular groove 57, the communication hole 34, 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 46' of the subliner 5' has a communication hole 53', an annular groove 57', a communication hole 34', a sub-piston hydraulic oil passage 73', a communication hole 28', a supply/discharge chamber 24, an annular oil drain groove. 29, a drain oil passage 72, and a drain oil pipe connection port 67 to communicate with a tank (not shown). In FIG. 3, the spool 41 of the main piston 4
In the process of upward sliding, the oil supply hole 56 and the communication hole 55 communicate with each other through the constant pressure chamber 47 of the main liner 5, and the pressure oil introduced from the oil supply hole 56 into the constant pressure chamber 47 is The alternating pressure chamber 26 of the pilot valve 2 passes through the communication hole 55, the annular groove 59, the communication hole 36, the pilot spool hydraulic oil passage 75, and the communication hole 26'.
flows into. Since the large valve stem 23 has a larger pressure receiving area than the small valve stem 22, 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, the supply/discharge chamber 2
4 to the annular oil supply groove 27 and the communication hole 28 and 2
8' is in communication with the main piston hydraulic oil passage 73 and the communication hole 34 through the communication hole 28 of the pilot valve 2.
It flows into the alternating pressure chamber 46 of the main liner 5 through the annular groove 57 and the communication hole 53, and also flows into the communication hole 28'.
From there, the subliner 5' passes through the sub-piston hydraulic oil passage 73', the communication hole 34', the annular groove 57', and the communication hole 53'.
into the alternating pressure chamber 46'. Alternate pressure chamber 46
The pressure receiving area of the spool 41 in the constant pressure chamber 4
7, the main piston 4 begins to slide downward. Similarly, the sub-piston 4' begins to slide downward. Next, as shown in Fig. 2, the main piston 4
In the process of sliding downward, the oil drain hole 54 and the communication hole 55 communicate with each other via the communication chamber 48, thereby causing the alternating pressure chamber 26 of the pilot valve 2 to communicate with the communication hole 55.
is the communication hole 26' and the pilot spool hydraulic oil passage 7.
5, the communication hole 36, the annular groove 59, the communication hole 55, the communication chamber 48, the oil drain hole 54, the annular groove 58, the oil drain hole 35, the drain oil passage 72 interposed between the annular oil drain groove 29, and the drain oil pipe connection port 67. The pressure in the alternating pressure chamber 26 decreases, so the pilot valve 2
The spool 21 is pressed by the small valve rod 22 on which pressure oil is constantly applied and slides downward, and then, as described above, the alternating pressure chamber 46 of the main liner 5 and the alternating pressure chamber of the sub liner 5'46' communicates with a tank (not shown), and the spool 41 of the main piston 4 and the spool 41' of the sub-piston 4' are connected to a constant pressure chamber 4, respectively.
7 and the pressure oil constantly introduced into the constant pressure chamber 47', it slides upward. When the spool 41 of the main piston 4 and the spool 41' of the sub-piston 4' vibrate, they slide upward and the large diameter portions 43, 4
The diameter-reducing stepped portions a, a' of 3' enter the brake chambers c, c' at the upper ends of the alternating pressure chambers 46, 46' (see Fig. 5), and oil is trapped in the brake chambers c, c'. At the same time, the reversal of the spool 21 of the pilot valve 2 causes the communication hole 5 to open.
The pressure oil supplied from 3, 53' is transferred to the large diameter section 43,
It acts on the pressure-receiving surface between 43' and the diameter-reducing step portions a, a' to quickly slide the spools 41, 41' downward. Similarly, the spools 41, 41' slide downward, and the diameter-reducing stepped portion b at the lower end of the large-diameter portions 43, 43',
b' rushes into the brake chambers d, d' at the lower ends of the constant pressure chambers 47, 47', and the oil is trapped in the brake chambers d, d' to produce a braking action, and the pilot valves 2 in succession By reversing the spool 21, the communication holes 53, 53' communicate with the discharge oil path 72,
The pressure oil supplied from the oil supply holes 56, 56' acts on the pressure receiving surface between the large diameter parts 43, 43' and the reduced diameter stepped parts b, b', and quickly moves the spools 41, 41' upward. make it slide. Since the weights of the main piston 4 and the sub-piston 4' and the pressure receiving areas in the alternating pressure chambers 46, 46' and the constant pressure chambers 47, 47' are also equal, the amplitudes of the main piston 4 and the sub-piston 4' are equal. As described above, the main piston 4 is vibrated by the interaction between the spool 21 of the pilot valve 2 and the spool 41 of the main piston 4 in the main liner 5, and the sub liner 5' is equipped with a spool 41'. Piston 4' is the main piston 4
The compacting plate 9 is connected to the lower ends of the main piston 4 and the sub-piston 4' by universal joints 8, 8 to perform compaction. Furthermore, pressure oil always flows into the constant pressure chamber 32 in the main cylinder 3 via the supply oil passage 71 and the oil supply hole 38, and the supply oil passage 71 through the annular oil supply groove 27.
The oil flows into the constant pressure chamber 32' in the sub-cylinder 3' through the oil supply hole 38', pushing up both the main liner 5 and the sub-liner 5'. When the handle 61 of the switching valve 6 is upright as shown in FIG. The sub-adjustment pressure chamber 31' communicates with a tank (not shown) through the passage 72 and the drain oil pipe connection port 67, and the sub-adjustment pressure chamber 31' is connected to the communication hole 33', the sub-adjustment oil passage 74', and the sub-pressure regulation hole 65.
, oil drain hole 63 , drain oil path 72 , and oil drain pipe connection port 67
The main liner 5 is connected to a tank (not shown) through
Both the subliner 5' and the subliner 5' remain pushed upward, and the machine frame body 1 does not tilt with respect to the compaction plate 9, so it does not move on its own while compacting. To make it self-propelled, the band 61 of the switching valve 6 is set to the second
When tilted to the right as shown in the figure, the main pressure adjustment hole 62 and the oil drain hole 63 communicate with each other, so that the main adjustment pressure chamber 3
1 communicates with a tank (not shown), and the oil supply hole 6
4 and the sub pressure regulation hole 65, the pressure oil in the supply oil passage 71 passes through the oil supply hole 64, the sub pressure regulation hole 65, the subliner regulation oil passage 74', and the communication hole 33' to reach the sub regulation pressure. It flows into chamber 31'. Since the pressure receiving area of the subliner 5' in the sub-adjustment pressure chamber 31' is larger than the pressure receiving area of the subliner 5' in the constant pressure chamber 32', the subliner 5' constantly adjusts the pressure flowing into the constant pressure chamber 32'. It is pushed downward against the upward force of the oil, resulting in the state shown in Figure 2. As a result, the vibration position of the spool 41' of the sub-piston 4' moves downward, and the machine frame body 1 is moved to the compaction plate by the universal joints 8, 8, the main piston 4, and the sub-piston 4'. Since it leans downward to the right relative to 9, it can move to the right while compacting. Contrary to the above, when the handle 61 of the switching valve 6 is tilted to the left as shown in FIG.
and the oil supply hole 64 communicate with each other, and the pressure oil in the supply oil passage 71 flows into the main adjustment pressure chamber 31. At the same time, the sub pressure adjustment hole 65 and the oil drain hole 63 communicate with each other, so that the sub adjustment pressure chamber 31' The machine frame main body 1 is connected to an outside tank and is tilted downward to the left with respect to the compaction plate 9 as shown in FIG. 3, so that it can self-propel to the left while compacting. Pressure oil leaking into the sliding parts of the spools 41, 41' and the liners 5, 5' during compaction is carried out between the annular grooves e, e', f, f' and the communication holes g, g', h, h'. , annular grooved communication hole 39, 39', 40, 40' and return oil passage 7
6 and discharge oil path 72, and is returned to a tank (not shown), and is not spouted to the outside.

Note that the number of main hydraulic oscillators and sub-hydraulic oscillators installed on the compaction plate is not limited to one each as in the illustrated embodiment; The plate is divided into two parts, a pair of main hydraulic oscillators are attached to one compaction plate, and a pair of sub-hydraulic oscillators are attached to the other compaction plate, and the four pistons are synchronously vibrated using a pilot valve. Alternatively, pressure oil may be supplied to and discharged from the pair of main liners and the pair of sub liners using a switching valve.

As can be easily understood from the above explanation,
In the present invention, the main liner in the main cylinder and the sub-liner in the sub-cylinder are slid by operating the handle of the switching valve, and the vibration positions of the main piston and the sub-piston are alternately adjusted. Since the inclination direction of the frame body can be adjusted to the left or right, 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, and Fig. 2 is a self-propelled adjustment state in the left and right direction, and a constant pressure is applied to the spool and each piston in the pilot valve. Fig. 3 is a vertical cross-sectional view showing a state where the valve is being adjusted in the leftward direction, and where alternating pressure is being applied to the spool and each piston in the pilot valve. The top view, FIGS. 4 and 5 are enlarged sectional views for explaining the braking action. 1: Machine frame body, 2: Pilot valve, 3: Main cylinder, 3': Sub cylinder, 4: Main piston,
4': Sub-piston, 5: Main liner, 5': Sub-liner, 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: Alternate pressure chamber, 26': Communication hole, 2
7: Annular oil supply groove, 28, 28': Communication hole, 29:
Annular oil drain groove, 31: Main adjustment pressure chamber, 31': Sub adjustment pressure chamber, 32: Main constant pressure chamber, 32': Sub constant pressure chamber, 33, 33': Communication hole, 34, 34': Communication hole , 35: Oil drain hole, 36: Communication hole, 37,3
7': Oil supply hole, 38, 38': Oil supply hole, 39, 3
9'40, 40': Communication hole with annular groove, 41, 4
1': Spool, 42, 42': Small diameter part, 43, 4
3': Large diameter part, 44, 44': Medium diameter part, 45: Reduced diameter part, 46, 46': Alternating pressure chamber, 47, 47': Constant pressure chamber, 48: Communication chamber, 49: Go stone-shaped collar ,51,
51': Upper fixed liner, 52, 52': Lower fixed liner, 53, 53': Communication hole, 54: Oil drain hole,
55: Communication hole, 56, 56': Oil supply hole, 57, 5
7', 58, 59, 60, 60': annular groove, 61:
Handle, 62: Main pressure adjustment hole, 63: Oil drain hole, 6
4: 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: Return oil passage, 81, 82:
Spring plate, 83, 84: Spring, 85: Spring tube, a,
a', b, b': diameter reduction step, c, c', d, d': brake chamber, e, e', f, f': annular groove, g, g', h,
h′: Communication hole.

Claims (1)

[Claims] 1 The machine frame body is equipped with a main cylinder with a main liner, a sub-cylinder with a sub-liner, and a pilot valve, and the lower ends of the main piston and sub-piston extend downward from each of the main cylinder and sub-cylinder. Connect the compaction plates with a universal joint,
The main piston is vibrated by the interaction between the pilot valve spool and the main piston spool in the main cylinder, and the sub-piston is made to vibrate synchronously with the main piston, allowing the vibration position of each piston to be adjusted. The main liner and the sub-liner are made slidable, and a main regulating pressure chamber and a sub-regulating pressure chamber are formed facing the upper end of each liner, and a main constant pressure chamber is formed facing the lower end of each liner. The main liner and sub liner are slidably adjusted in opposite directions by alternately supplying and discharging pressure oil to the main regulating pressure chamber and the sub regulating pressure chamber using a switching valve. A self-propelled hydraulic vibration compaction machine characterized in that the frame body is inclined with respect to the compaction plate so that it can move forward and backward while compacting while moving on its own.