JPS58200802A - Amplitude control device in amplitude variable oil pressure oscillator - Google Patents

Abstract

PURPOSE:To facilitate the handling of an oil pressure piston which is oscillated by means of pressure oil transferred and controlled by a spool and has a varying amplitude by making said amplitude adjustable by a remote control with a variable valve. CONSTITUTION:When pressure oil is fed to a connection port 48 from an oil pressure source, the pressure oil enters fixed pressure chambers 11, 21 of a pilot valve 2 and a cylinder 3 through a hole 11' and a feed oil port 29 and moves a spool downward and also moves a piston 4 upward. When a communicating port 31 is communicated to a feed oil port 33 through a communicating chamber 23 during the upward movement of the piston 4, the spool 7 is moved upward by the pressure oil having entered the alternating pressure chamber 12 of the valve 2, then the pressure oil enters an alternating pressure chamber 22 through passages 13, 8, 14, 53, 32, and moves the piston 4 downward. At this time, if a remote controlled valve 6 is opened so that the pressure of the adjusting pressure chamber 39 of a variable valve 5 is reduced and the pressure oil of an oil chamber 28 is discharged through a spool 34, a slide liner 17 is moved upward and the amplitude of the piston 4 ca be varied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for controlling the amplitude of a hydraulic piston in a variable hydraulic oscillator.

The present applicant has long developed a spool that receives constant pressure and alternating pressure from both sides within a pilot valve;
The hydraulic piston is caused to vibrate by interaction with a hydraulic piston which receives constant pressure and alternating pressure from both sides in the cylinder, and the vibration of the hydraulic piston is accommodated between the cylinder and the hydraulic piston. We have been conducting research on a variable amplitude hydraulic oscillator in which the amplitude of the hydraulic piston is made variable by adjusting the sliding of the sliding liner, and we have already obtained patents for some of our results. The present invention is to provide an amplitude control device for such a variable amplitude hydraulic oscillator that is easy to handle and can be operated remotely.

Embodiments of the present invention will be described below with reference to the drawings. The drawings are longitudinal sectional views of a variable amplitude hydraulic oscillator equipped with the amplitude control device of the present invention, in which FIG. 1 shows the amplitude adjusted to the minimum, and FIG. indicates the state where the amplitude is adjusted to the maximum.

In the figure, reference numeral 1 denotes a variable amplitude hydraulic oscillator, which includes a pilot valve 2, a cylinder 3, a hydraulic piston 4, a variable valve 5, and a remote control valve 6. 7' is a spool slidably built into the pilot valve 2, and 8 is a spool 7.
This is an annular supply/discharge chamber formed in the middle of the 9 and 1
0 are a small-diameter operating rod and a large-diameter operating rod that press both ends of the spool 7, respectively. Reference numerals 11 and 12 are constant pressure chambers and alternating pressure chambers into which pressure oil is introduced into the end faces of the small diameter operating rod 9 and the large diameter operating rod 10, respectively, for cooling. When the pilot valve 2 is placed in a talino position and the spool 7 moves downward m shown in FIG.
The oil supply hole 13 and the communication hole 14 are designed to communicate with each other through the supply and discharge chamber 8 when the spool 7 moves upward as shown in FIG. A fixed liner 16 and a sliding liner 17 each having a large diameter part and a small diameter part are provided between the cylinder 3 and the hydraulic piston 4 on the lower constant pressure side and the upper alternating pressure side of the cylinder 3, respectively. That is, the lower part of the hydraulic piston 4 is connected to the small diameter part 18 of the fixed liner 16, the central spool part 19 of the hydraulic piston 4 is connected to the large diameter part of the fixed liner 16 and the large diameter part of the sliding liner 17, and the upper part of the hydraulic piston 4 is connected to the small diameter part 18 of the fixed liner 16. They are each slidably fitted into the small diameter portion 20 of the sliding liner 17. A constant pressure chamber 21 with a small pressure receiving area and an alternating pressure chamber 22 with a large pressure receiving area are formed between the spool portion 19 of the hydraulic piston 4 and the fixed liner 16 and sliding liner 17, respectively.

23 is a communication chamber formed in the spool portion 19 of the hydraulic piston 4 and formed in an annular direction. A brake chamber 24.
25 is formed. 26 and 27 are brake stepped portions provided at both ends of the spool portion 19 of the hydraulic piston 4;
When entering the brake chambers 24 and 25 respectively, the oil is pumped out to trap it. An oil chamber 28 is formed between the sliding liner 17 and the cylinder 3 near the upper opening end of the sliding liner 17 . The large diameter portion of the fixed liner 16 is provided with an oil supply port 29 that opens at the lower part of the constant pressure chamber 21, an oil drain port 30 that opens in the middle, and a communication port 31 that opens at the upper end. There is an alternating pressure chamber 22 in the large diameter part of the
A communication port 32 that opens at the top of the large-diameter portion and an oil supply port 33 that opens near the lower opening end of the large diameter portion are provided. When the hydraulic piston 4 moves upward, the oil supply port 3
3 and the communication port 31 (see FIG. 1), when the hydraulic piston 4 moves downward, the communication port 31 communicates with the communication chamber 23.
The oil drain port 3o is designed to communicate with the oil drain port 3o. 34 is a spool slidably built into the variable valve 5;
is an annular supply/discharge chamber formed in the middle of the spool 34.

Reference numerals 36 and 37 are a small-diameter operating rod and a large-diameter operating rod that press both ends of the spool 34, respectively. Reference numerals 38 and 39 are constant pressure chambers and regulating pressure chambers that introduce pressure and power oil into the end faces of the small diameter operating rod 36 and the large diameter operating rod 37, respectively. The side wall where the variable valve 5 is attached to the cylinder 3 is provided with an oil supply hole 41 with a built-in tEIt[-valve 40, a communication hole 42, and a υ14 oil hole 43, so that when the spool 34 moves to the upper blade, the supply and discharge chamber 35
11), the communication hole 42 and the oil drain hole 43 communicate with each other through the spool 34, and when the spool 34 moves downward, the communication hole 42 and the oil supply hole 41 communicate with each other through the supply and discharge chamber 35, and in the neutral position, the communication hole 42 communicates with the oil supply hole 43. It is designed to be cut off from both the hole 4ri and the Yuyu hole 43. The remote control valve 1 has a cylinder 44, a piston 45, and a handle 46ft. 47 is IU
This is an oil chamber formed by a cylinder 44 and a piston 45. The upper end surface of the cylinder 3 is provided with an oil supply pipe connection port 48, an oil drain pipe connection port 49, and a variable valve operating pipe connection OSO communicating with the oil chamber 47 of the remote control valve 6. Reference numeral 51 denotes a supply oil passage, which includes a hole ll' for bending the oil supply pipe access port 48 into the constant pressure chamber 11 of the pilot valve 2, the oil supply hole 13, the oil supply port 29 of the fixed liner 16, and the oil supply of the sliding liner 17. The port 33 and the hole 38' communicating with the constant pressure chamber 38 of the variable valve 5 and the oil supply hole 4
] is connected to. Reference numeral 52 denotes a drain oil passage, which communicates the drain oil pipe connection port 49 with the drain hole 15 of the pilot valve 2, the drain hole 3o of the fixed liner 16, and the drain hole 43 of the variable valve 5. 53 is an oil passage for piston operation, which communicates the communication hole 14 of the pilot valve 2 with the communication port 32 of the sliding liner 7. Reference numeral 54 denotes a stool operating oil passage, which communicates a hole 12' communicating with the alternating pressure chamber 12 of the pilot valve 2 with the communication port 31 of the fixed liner 16. Reference numeral 55 denotes an oil passage for operating the sliding liner, which communicates with the communication hole 42 of the variable valve 5 and the hole 28 that communicates with the oil chamber 28 of the cylinder 3. Reference numeral 56 denotes a variable valve operating oil passage, which communicates the variable valve operating pipe connection port 50 with the hole 39' communicating with the regulating pressure chamber 39 of the variable valve 5. 1. Reference numeral 57 is a stopper nut for the sliding liner 17, and reference numeral 58 is a check valve 59, which is a tank.

Variable amplitude music oscillator l of the present invention configured as described above
is installed in a civil engineering work machine or the like that requires variable amplitude, and the oil supply pipe connection port 48 and the oil drain pipe connection port 44 of the cylinder 3 are connected to a hydraulic power source and a tank, etc. (not shown), and the remote control valve 6 is connected to the cylinder 3. It is used by placing it close to hand.

Therefore, the oil supply line 5 is connected from the oil pressure source through the oil supply pipe connection port 48.
When pressure oil is supplied to the pilot valve 1, the pressure oil is introduced into the constant pressure chamber 11 of the pilot valve 2 and the constant pressure chamber 21 of the cylinder 3 through the hole 11' and the oil supply port 29, respectively, and as shown in FIG. In the valve 2, the spool 7 moves downward via the small diameter operating rod 9, and in the cylinder 3, the hydraulic piston 4 starts moving upward. At this time, the alternating pressure chamber 22 in the cylinder 3 is connected to the communication port 32.
, a piston operating oil passage 53, a communication hole 14, a supply/discharge chamber 8, an oil drain hole 15, an oil discharge passage 52, and an oil drain pipe connection port 49, which communicate with a tank (not shown). Next, in the process of upward movement of the hydraulic piston, the communication port 31 communicates with the oil supply port 33 via the communication chamber 23 formed in the spool portion 19 of the hydraulic piston, as shown in the top view.
The pressure oil supplied to the oil supply port 33 is supplied to the communication chamber 23, the communication chamber 31. The oil is introduced into the alternating pressure chamber 12 of the pilot valve 2 via the spool operating oil passage 54 and the hole 12'. Since the pressure receiving area of the large diameter operating rod lO is larger than the pressure receiving area of the small diameter operating rod 9, the large diameter operating rod 10 overcomes the pressing force of the small diameter operating rod 9 and moves the spool 7 upward. When the spool 7 moves upward, it passes through the oil supply hole 1 through the supply and discharge chamber 8.
3 and the communication hole 14 are in communication.The pressure oil supplied to the oil supply hole 13 is connected to the supply/discharge chamber 8, the communication hole 14, and the piston operating oil path 53.
and is introduced into the alternating pressure chamber 22 of the cylinder 3 via the communication port 32. Hydraulic piston 4 in alternating pressure chamber 22
Since the pressure receiving area of the hydraulic piston 4 is larger than the pressure receiving area of the hydraulic piston 4 in the constant pressure chamber 21, the hydraulic piston 4 starts moving downward. Next, in the process of downward movement of the hydraulic piston 4, the communication port 31 and the oil drain port 3o
When the 11 force in the alternating pressure chamber 12 of the pilot valve 2 decreases, the spool 7
is pressed by the small diameter operating rod 9 and moves downward. As a result, the alternating pressure chamber 22 of the cylinder 3 communicates with the tank (not shown) as described above, and the pressure in the alternating pressure chamber 22 decreases, so that the hydraulic piston 4 is pressed against the pressure oil in the constant pressure chamber 21. and move upward. When the hydraulic piston 4 moves upward and the brake stepped portion 27 enters the brake chamber 25, oil is sealed in the brake chamber 25 to produce a braking action. Similarly, when the hydraulic piston 4 moves downward and the brake stepped portion 26 enters the brake chamber 24, oil is sealed in the brake chamber 24 to produce a braking action. Thereafter, the above operation is repeated, and the interaction between the spool 7 in the pilot valve 2 and the hydraulic piston 4 in the cylinder 3 makes it possible to vibrate the hydraulic piston 4.

Next, to adjust the amplitude, pull up the handle 46 of the remote control valve 6 from the neutral position to connect the variable valve operation pipe connection port 50 and the variable valve operation oil path 56 to the oil chamber 47 of the remote control valve 6. , the regulating pressure chamber 3 communicating through the hole 39'.
9 decreases, and the pressure oil supplied to the constant pressure chamber 38 through the hole 38' moves the spool 34 upward from the neutral position via the small diameter operating rod 36, and the oil drain hole 43 is opened. -"- The through hole 42 and the oil drain hole 43 are
356, and the pressure 1u of the oil chamber 28 of the cylinder 3
m.

are hole 28', sliding liner operating oil passage 55, communication hole 42,
Supply/discharge chamber 35, oil drain hole 43, drain oil path 52. The sliding liner 17 is caused to slide upward by the pressure oil that is led out to a tank (not shown) through the drain oil pipe connection port 49 and introduced into the alternating pressure chamber 22 of the cylinder 3 via the pilot valve 2. . When the sliding liner 17 moves upward the required distance, the remote control valve 6
By pushing the handle 46 to the neutral position, the pressurized oil in the oil chamber 47 of the remote control valve 6 is transferred to the variable valve operation pipe connection port: 50, variable valve operation oil passage 56, hole 39'.
The oil is introduced into the adjustment pressure chamber 39 through the pressure control chamber 39, and the large-diameter operating rod 37 overcomes the pressing force of the small-diameter operating rod 36 and pushes the spool 34 downward, thereby blocking the oil drain hole 43 of the variable valve 1 and draining the oil chamber. 28
The oil within is trapped and the sliding liner 17 is held in place. Further, by pushing the handle 46 of the remote control valve 6 downward from the neutral position, the spool 34 of the variable valve 5 is pressed by the large diameter operating rod 37 and moves downward from the neutral position, and the oil supply hole 41 is opened. and communication hole 4
2 and the oil supply hole 41 communicate with each other via the supply and discharge chamber 35, and the oil supply hole 4
1 is introduced into the oil chamber 28 through the check valve 40 built into the oil supply hole 41, the supply/discharge chamber 35, the communication hole 42, the sliding liner operating oil passage 55, and the hole 28'. , oil chamber 2
Since the pressure receiving area within the pressure chamber 8 is larger than the pressure receiving area within the alternating pressure chamber 22, the sliding liner 17 slides downward. When the sliding liner 17 moves downward the required distance, by pulling up the handle 46 of the remote control valve 6 to the neutral position, the spool 34 is pushed upward to the neutral position by being pressed by the small diameter operating rod 36 as described above. The oil supply hole 41 is closed by sliding, the oil in the oil chamber 2B is trapped, and the sliding liner 17 is held at the one-stroke position. When the sliding liner 17 is slidably adjusted as described above, the positions of the oil filler port 33 and the brake chamber 25 are adjusted with respect to the cylinder 3, and as a result, the positions of the communication port 31 of the fixed liner 16 and the sliding liner 17 are adjusted. The distance to the oil supply port 33 is adjusted, and the pressure oil supplied to the oil supply port 33 is transferred to the communication chamber 23 of the hydraulic piston 4, the communication chamber 31. The timing at which the oil is introduced into the alternating pressure chamber 12 of the pilot valve 2 through the spool operating oil passage 54 and the hole 12' is adjusted. Since the relative position between the brake chamber 25' and the fuel filler port 33 remains unchanged, sliding the sliding liner 17 in the direction closer to the stationary liner 16 will advance the timing described above, thereby causing the fuel filler to move upward. As a result, the timing at which the hydraulic piston 4 starts to move in the downward direction is brought forward, and the timing at which the hydraulic piston 4 starts to move downward with a constant phase difference that is not related to the amplitude is also brought forward. As a result, the sliding distance of the hydraulic piston 4 becomes smaller, and the amplitude becomes smaller. Become. When the sliding liner 17 abuts the fixed liner 16, the amplitude is at a minimum, and when the sliding liner 17 abuts against the stopper nut 57, the amplitude is at a maximum. Therefore, the handle 46 of the remote control valve 6 is pulled up from the neutral position to shut off the hydraulic pressure source (not shown) and the oil chamber 28, and the oil chamber 28 is communicated with the tank (not shown), thereby controlling the cylinder 3 via the variable valve 5. The pressure oil in the oil chamber 28 is led out to a tank (not shown), the sliding liner 17 slides upward, and the amplitude of the hydraulic piston 4 increases.

Return the handle 46 to the neutral position so that the oil chamber 28 is 1l (not shown).
When both fl FE h'i and the tank are shut off, oil is trapped in the oil chamber 28 and the position of the sliding liner 17 is maintained, thereby keeping the amplitude constant.

In addition, by pushing down the handle 46 and communicating the oil pressure source with the oil chamber 28, pressure oil is introduced into the oil chamber 28 through the variable valve 6, and the sliding liner 17 slides downward, causing the oil field piston 4 amplitude decreases.

The check valve 40 introduces pressure oil into the oil chamber 28 to prevent the sliding liner 17 from sliding upwards, thereby ensuring prompt reversal of the hydraulic piston. The amount of displacement of the handle 46 of the remote control valve 6 from the neutral position is proportional to the amount of displacement of the piston 45, and the amount of displacement of the piston 45 is proportional to the change in the amount of oil in the oil chamber 47. The amount change corresponds one-to-one to the oil amount change in the regulating pressure chamber 39 of the variable valve 5, and is proportional to the sliding distance of the spool 34. Corresponding to the opening width, the size of the opening width of the oil supply hole 41 or the oil drain hole 43 changes the amount of pressure oil per hour supplied to and discharged from the oil chamber 28 of the cylinder 3, and the sliding of the sliding liner 17 changes. Speed changes. Therefore, the amount of displacement of the handle 46 of the remote control valve 6 corresponds to the amplitude change rate of the oil field piston 4. Note that a tank 59 is connected to the oil chamber 47 of the remote control valve 6 via a check valve 58.
The oil field circuit communicated with is a replenishment circuit that supplies oil leakage to the oil chamber 47 during assembly and during assembly.

As can be easily understood from the above description, the amplitude control device in the variable amplitude oilfield oscillator of the present invention is capable of arbitrarily adjusting the amplitude of the oilfield piston by remote control, and the amount of displacement of the handle of the remote control valve. can correspond to the rate of change in the amplitude of the hydraulic piston, and when used in oilfield impact machines such as hydraulic breakers, there is a one-to-one correspondence between the amplitude of the oilfield piston and the impact force, and the opening is designed to match the speed of change in the amplitude of the hydraulic piston. In case of an emergency, the striking force can be easily adjusted by simply operating the handle.

[Brief explanation of the drawing]

The drawings show an embodiment of a variable amplitude oil field oscillator equipped with the amplitude control device of the present invention, in which FIG.
Fig. 2 is a longitudinal cross-sectional view showing a state in which alternating pressure is acting on the piston, and Fig. 2 is a longitudinal cross-sectional view showing a state in which the amplitude is adjusted to the maximum and a constant force is acting on the pilot valve spool and the oilfield piston. It is a front view. 1-...variable amplitude oil field oscillator, 2-pilot valve, 3-
Cylinder, 4-oil field piston, 5-variable valve, 6-remote control valve, 7-7:, pool, 8-supply/discharge chamber, 9-small diameter operating rod, 10-large diameter operating rod, 11-.・1000 rooms, 12-
・Alternating pressure chamber, 13-oil supply hole, 14 series of communication holes, 15-・
Oil drain hole, 16-Fixed liner, 17-Sliding liner, 18
- small diameter part, 19 - spool part, 20 - small diameter part, 21 constant pressure chamber, 22 - alternating pressure chamber, 23 continuous communication chamber, 24.
25-・Brake chamber, 26.27- Brake step section,
28-・Oil chamber, 29-Oil filler port, 30・~Oil drain [1, 31
Series of ports, 32 series of ports, 33-... Fuel filler port, 34-...
Spool, 35-supply/discharge chamber, 36-small diameter operating rod, 37-large diameter operating rod, 38 constant force chamber, 39...adjustment pressure chamber, 4
0.--Check valve, 41--Oil supply hole, 42-Series hole, 43--Supply oil path, 52--Discharge oil path, 53--Piston operating oil path, 54--Spool operating oil path, 55・-Oil passage for sliding liner operation, 56-・Oil passage for variable valve operation designated agent
Japanese National Railways Governor’s Office Legal Affairs 2! Sekiba Daishu

Claims (1)

[Claims] The hydraulic piston is vibrated by the interaction between a spool that receives constant pressure and alternating pressure from both sides in the pilot valve and a hydraulic piston that receives constant pressure and alternating pressure from both sides in the cylinder. and a variable amplitude hydraulic oscillator in which the amplitude of the hydraulic piston is made variable by slidingly adjusting a sliding liner between the cylinder and the hydraulic piston to adapt to the vibrations of the hydraulic piston. An oil chamber is provided at one end of the sliding liner, and by supplying and discharging oil to the core oil chamber, the sliding liner is slidably adjusted to adjust the amplitude of the hydraulic piston.
A variable valve is provided to provide a J-shift, and the variable valve reduces the amplitude of the hydraulic piston at a position where the hydraulic pressure source and the oil chamber communicate with each other via a check valve, cuts off the hydraulic pressure source and the oil chamber, and also closes the oil chamber. The amplitude of the hydraulic piston is increased at the position where the oil volume is communicated with the tank and the oil pressure source), and the vibration of the hydraulic piston is increased at the position where the oil volume is cut off from both the hydraulic source and the tank.
An excavation control device for a variable amplitude hydraulic oscillator, characterized in that the amplitude is maintained constant.