JPS5934889B2 - Hydraulic oscillator with adjustable amplitude - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an amplitude-adjustable hydraulic oscillator that is incorporated into a civil engineering work machine or the like.

(Problems to be Solved by the Prior Art and the Invention) A spool valve body receives constant pressure and alternating pressure from both sides in a pilot valve housing, and a spool valve body receives constant pressure and alternating pressure from both sides in a hydraulic cylinder. In a conventional hydraulic oscillator that vibrates the hydraulic piston by interaction with the hydraulic piston, the hydraulic oscillator includes a valve for connecting the constant pressure side of the hydraulic piston and the alternating pressure side of the spool valve body. The position of the cylinder output oil pressure port where the body return-action oil passage opens into the hydraulic cylinder is fixed, and the piston return-action oil passage for connecting the output oil pressure port of the pilot valve housing and the alternating pressure side of the hydraulic piston is fixed to the hydraulic cylinder. Since the position of the reciprocating piston oil supply port that opens into the cylinder remains unchanged, the amplitude of the hydraulic piston remains unchanged.

Therefore, the conventional hydraulic oscillator cannot be used in applications requiring variable amplitude.

The object of the present invention is to improve the conventional hydraulic oscillator so that the amplitude can be adjusted.

(Means for solving the problem) In order to achieve the above object, the present invention divides a sleeve disposed as a liner in a hydraulic cylinder into a fixed sleeve on the constant pressure side and a sliding sleeve on the alternating pressure side. , the sliding sleeve is provided with an oil filler port for amplitude adjustment in addition to the oil filler port for backward movement of the piston, and in the process of the backward movement of the hydraulic piston, the oil filler port for amplitude adjustment is formed by an annular groove formed in the spool portion of the hydraulic piston. A fixed sleeve is provided with a cylinder output hydraulic pressure port that communicates with the valve body, and the cylinder output hydraulic pressure port is connected to the alternating pressure chamber of the pilot valve housing through a valve body reciprocating oil passage, and the hydraulic oscillator is controlled by sliding adjustment of the sliding sleeve. The amplitude is adjusted.

That is, the amplitude-adjustable hydraulic oscillator of the present invention has a pilot valve that has a constant pressure chamber and an alternating pressure chamber at its rotational end, and has an oil supply port, an output hydraulic pressure port, and an oil drain port at its side. A spool valve body with an annular groove that communicates between the oil supply port and the output hydraulic pressure port when moving forward and between the output hydraulic pressure port and the oil drain port when moving backward is disposed inside the housing, and on the other hand, (B1 ) A fixed sleeve consisting of a medium diameter part and a large diameter part inside the hydraulic cylinder,
A sliding sleeve consisting of a small diameter portion and a large diameter portion is arranged with their large diameter opening ends facing each other, and (B2) a hydraulic piston with a spool portion is inserted into the fixed sleeve and the sliding sleeve. to form a constant pressure chamber and an alternating pressure chamber between the hydraulic piston and the fixed sleeve and the sliding sleeve, respectively, and (B3) a sliding member for sliding the sliding sleeve on a small diameter portion of the sliding sleeve. (C7) a piston forward movement oil supply port, a cylinder oil drain port, and a cylinder output oil pressure port are provided in the large diameter portion of the fixed sleeve in order from the middle diameter portion to the large diameter opening end; The large diameter portion of the sliding sleeve is provided with a piston reciprocating oil supply port and an amplitude adjustment oil supply port near the small diameter portion and the large diameter opening end, respectively, and the outer circumferential surface of the sliding sleeve is provided with a piston reciprocating oil supply port near the small diameter portion and near the large diameter opening end. An annular groove for amplitude adjustment is formed which communicates with the oil supply port and the oil supply port for amplitude adjustment, respectively, (11) the spool portion of the hydraulic piston communicates with the cylinder oil drain port and the cylinder output hydraulic pressure port when reciprocated; When the cylinder moves backward, an annular groove is formed that communicates the cylinder output hydraulic pressure port and the oil filler port for amplitude adjustment, and (El) the constant pressure chamber and the oil filler port of the pilot valve housing, the oil filler port for forward movement of the piston, and the oil filler port for amplitude adjustment are formed. (B2) the oil drain port of the pilot valve housing and the cylinder oil drain port are connected to the oil drain path, and (B3) the output hydraulic pressure port of the pilot valve housing and the piston are connected to each other. A double-acting oil supply port is connected by a piston double-acting oil passage, and (B4) the cylinder output hydraulic pressure port and an alternating pressure chamber of the pilot valve housing are connected by a valve body double-acting oil passage. It is.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a state in which the amplitude is adjusted to the maximum, and FIG. 2 is a longitudinal sectional view showing a state in which the amplitude is adjusted to the minimum.

In the figure, 1 is a hydraulic oscillator.

The hydraulic oscillator 1 includes a pilot valve housing 2 containing a spool valve body 5, and a hydraulic cylinder 3 into which a hydraulic piston 4 is inserted.

6 is an annular groove formed in the center of the spool valve body 5.

Reference numerals 7 and 8 are a small diameter operating rod and a large diameter operating rod that press both ends of the spool valve body 50, respectively.

9 and 10 are constant pressure chambers and alternating pressure chambers formed at both ends of the pilot valve housing 2, respectively.

Pressure oil is supplied to the end faces of the small-diameter operating rod 7 and large-diameter operating rod 8 to the constant pressure chamber 9 and the alternating pressure chamber 10 through an oil supply port 9' for forward movement of the valve body and an oil supply port 10' for backward movement of the valve body, respectively. is being introduced.

The side part of the pilot valve housing 2, that is, the pilot valve housing 2
An oil supply port 11, an output hydraulic pressure port 12, and an oil drain port 13 are provided on the side where the oil pressure cylinder 3 is attached.

The annular groove 6 of the spool valve body 5 communicates the output hydraulic pressure port 12 and the oil drain port 13 when the spool valve body 5 moves downward as shown in FIG. As shown in the figure, the oil supply port 11 and the output hydraulic pressure port 12 are formed to communicate with each other when the oil supply port 11 moves upwardly.

On the lower constant pressure side and the upper alternating pressure side of the hydraulic cylinder 3, a fixed sleeve 14 is provided between the hydraulic cylinder 3 and the hydraulic piston 40, each having a medium diameter part and a large diameter part, and a small diameter part and a large diameter part. The sliding sleeves 15 are arranged with their large-diameter opening ends facing each other, and the sliding sleeves 15 can be slidably adjusted by means of sliding adjusting means, such as adjusting screws 16, provided on the small-diameter portions of the sleeves. It looks like this.

Fixed sleeve 140, inner diameter of large diameter part and sliding sleeve 150
The inner diameter of the large diameter portion is the same.

The spool portion 17 of the hydraulic piston 4 is connected to the fixed sleeve 1
The medium diameter piston rod is slidably fitted into the large diameter section of 40 and the large diameter section of the sliding sleeve 150, and the medium diameter piston rod extending downward and the small diameter piston rod extending upward of the spool section 17 are fixed respectively. It is slidably inserted into the middle diameter part of the sleeve 14 and the small diameter part of the sliding sleeve 15.

A constant pressure chamber 18 and an alternating pressure chamber 19 are provided between the hydraulic piston 4 and the fixed sleeve 14 and sliding sleeve 15, respectively.
is formed.

The pressure receiving area of the spool portion 17 on the constant pressure chamber 18 side is smaller than the pressure receiving area on the alternating pressure chamber 19 side.

The spool portion 17 has an annular groove 20.

Brake chambers 21 and 22 are formed at the lower end of the constant pressure chamber 18 and at the upper end of the alternating pressure chamber 19, respectively.

A piston reciprocating oil supply port 23, a cylinder oil drain port 24, and a cylinder output hydraulic pressure port 25 are provided in the large diameter portion of the fixed sleeve 140 in order from the middle diameter portion to the large diameter opening end.

A piston reciprocating oil supply port 26 and an amplitude adjustment oil supply port 27 are provided in the large diameter portion of the sliding sleeve 150, respectively, near the small diameter portion and near the large diameter opening end.

Annular grooves for amplitude adjustment are formed on the outer peripheral surface of the sliding sleeve 15 and communicate with the reciprocating piston oil supply port 26 and the amplitude adjustment oil supply port 27, respectively.

The annular groove 20 of the spool portion 17
When 7 moves back downward, the cylinder oil drain port 24 and the cylinder output hydraulic pressure port 25 are connected to each other, and as shown in FIG. It is formed so as to communicate with the opening 27.

An oil supply pipe connection port 28 and an oil drain pipe connection port 29 are provided on the upper end surface of the hydraulic cylinder 3.

30 is an oil supply path communicating with the oil supply pipe connection port 28;
is an oil drain passage communicating with the oil drain pipe connection port 29.

Reference numeral 32 represents a piston reciprocating oil passage, and 33 represents a valve element reciprocating oil passage.

The oil filler port 9' and oil filler port 11 for forward movement of the valve body of the pilot valve housing 2 and the oil filler port 2 for forward movement of the piston of the fixed sleeve 14.
3 and the amplitude adjusting oil supply port 27 of the sliding sleeve 15 are connected to an oil supply path 30, respectively.

Oil drain port 13 and fixed sleeve 14 of the pilot valve housing 2
The cylinder oil drain ports 24 are connected to oil drain passages 31, respectively.

The output hydraulic pressure port 12 of the pilot valve housing 2 and the piston reciprocating oil supply port 26 of the sliding sleeve 15 are connected through a piston reciprocating oil passage 32.

The cylinder output oil pressure port 25 of the fixed sleeve 14 and the oil supply port 10' for the valve body reciprocating operation of the pilot valve housing 2 are connected through a valve body reciprocating oil passage 33.

34 is a locking nut screwed onto the adjustment screw 16 of the sliding sleeve 15, and 35 is a locking hole formed in the upper end surface of the small diameter portion of the sliding sleeve 15 for adjusting the rotation of the sliding sleeve.

The sliding adjusting means for slidingly adjusting the sliding sleeve 15 may be replaced with the illustrated adjustment screw and may be replaced with another hydraulic type.

(Function) The hydraulic oscillator 1 of the present invention configured as described above is installed in civil engineering work etc. where variable amplitude is required, and the hydraulic oscillator 1 is installed in the hydraulic cylinder 3.
The oil supply pipe connection port 28 and the oil drain pipe connection port 29 are connected to a hydraulic power source, a tank, etc. (not shown), respectively.

Therefore, the oil supply path 30 is connected from the oil pressure source through the oil supply pipe connection port 28.
When pressure oil is supplied to the valve body forwarding oil supply port 9'
The oil is introduced into the constant pressure chamber 9 of the pilot valve housing 2 and the constant pressure chamber 18 of the hydraulic cylinder 3 through the piston reciprocating oil supply port 23, and as shown in FIG. The spool valve body 5 moves downward via the rod 7, and the hydraulic piston 4 in the hydraulic cylinder 3 starts moving upward.

At this time, the alternating pressure chamber 19 of the hydraulic cylinder 3 includes the piston reciprocating oil supply port 26, the piston reciprocating oil passage 32, the valve housing output oil pressure port 12, the annular groove 6 of the spool valve body 5, and the oil drain port 13.
, communicates with a tank (not shown) via an oil drain path 31 and an oil drain pipe connection port 29.

Next, when the hydraulic piston 4 moves upward, as shown in FIG. The pressure oil that is in communication and is supplied to the amplitude adjustment oil supply port 27 through the oil supply path 30 is connected to the annular groove 20.
The oil is introduced into the alternating pressure chamber 10 of the pilot valve housing 2 through the cylinder output oil pressure port 25, the valve body reciprocating oil passage 33, and the valve body reciprocating oil supply port 10'.

Since the pressure receiving area of the large diameter operating rod 8 is larger than the pressure receiving area of the small diameter operating rod 7, the large diameter operating rod 8 overcomes the pressing force of the small diameter operating rod 7 and moves the spool valve body 5 upward.

When the spool valve body 5 moves upward, the oil supply port 11 and the output hydraulic pressure port 12 communicate with each other through the annular groove 6, and the pressure oil is supplied to the oil supply port 11, the annular groove 6, the output hydraulic pressure port 12, and the piston for return movement. The oil is introduced into the alternating pressure chamber 19 of the hydraulic cylinder 3 through the oil passage 32 and the piston reciprocating oil supply port 26.

Since the pressure receiving area of the spool portion 17 in the alternating pressure chamber 19 is larger than the pressure receiving area of the spool portion 17 in the constant pressure chamber 18, the hydraulic piston 4 starts to move back downward.

Next, when the hydraulic piston 4 moves downward, the cylinder output hydraulic pressure port 25 and the cylinder oil drain port 24 communicate with each other via the annular groove 20, and the pressure oil in the alternating pressure chamber 10 of the pilot valve housing 2 is discharged from the valve body. Oil supply port 10' for double action, valve body oil passage 3 for double action
3. The oil is led out to a tank (not shown) through the cylinder output oil pressure port 25, the annular groove 20, the cylinder oil drain port 24, the oil drain path 31, and the oil drain pipe connection port 29, and the pressure inside the alternating pressure chamber 10 decreases. The spool valve body 5 is pressed by the small-diameter operating rod 7 and moves downward, and the output hydraulic pressure port 12 and the oil drain port 13 communicate with each other through the annular groove 6 of the spool valve body 5.

As a result, the alternating pressure chamber 19 of the hydraulic cylinder 3 communicates with the tank (not shown) as described above, and the pressure inside the alternating pressure chamber 19 decreases, so that the hydraulic piston 4 is moved to the spool portion 1.
7, it is pressed by the pressure oil in the constant pressure chamber 18 and moves upward.

When the hydraulic piston 4 moves upward and the piston backward movement oil supply port 26 is closed by the spool portion 17, oil is sealed in the brake chamber 22 to produce a braking action.

Similarly, the hydraulic piston 4 moves downward and the spool portion 17
When the piston forward movement oil supply port 23 is closed, oil is sealed in the brake chamber 21 and a braking action is produced.

Thereafter, the above operation is repeated. As above,
Spool valve body 5 and hydraulic cylinder 3 in pilot valve housing 2
The hydraulic piston 4 vibrates due to the interaction with the hydraulic piston 4 inside.

Next, to adjust the amplitude, loosen the locking nut 34 so that the sliding sleeve 15 can be rotated, and the sliding sleeve 1
Attach an appropriate tool to the locking hole 35 formed on the upper end surface of the small diameter portion of the hydraulic cylinder 3, rotate the sliding sleeve 15 by the required angle, and slide the sliding sleeve 15 along the inner surface of the hydraulic cylinder 3 for the required distance. After moving, the locking nut 34 is tightened.

When the sliding sleeve 15 is slidably adjusted as described above,
The positions of the amplitude adjusting oil supply port 27 and the brake chamber 22 relative to the hydraulic cylinder 3 are adjusted.

As a result, the distance between the cylinder output hydraulic port 25 of the fixed sleeve 14 and the amplitude adjustment oil supply port 27 of the sliding sleeve 15 is adjusted, so that oil is supplied to the amplitude adjustment oil supply port 27 through the oil supply path 30. As shown in FIG. 2, the pressure oil is supplied to the pilot valve housing 2 through the annular groove 20 of the spool portion 17, the cylinder output oil pressure port 25, the valve body reciprocating oil passage 33, and the valve body reciprocating oil supply passage 10'. The timing of introduction into the alternating pressure chamber 10 is adjusted.

Since the relative position between the brake chamber 22 and the amplitude adjustment oil supply port 27 remains unchanged, when the sliding sleeve 15 is slid in the direction approaching the fixed sleeve 14 in FIG. As a result, the timing at which the spool valve body 5 starts to move back upward is brought forward, and the timing at which the hydraulic piston 4 starts to move back downward with a constant phase difference that is not related to the amplitude is also brought forward.
By downward sliding adjustment of the amplitude adjustment oil filler port 27,
The amplitude of the hydraulic piston 4 becomes smaller.

That is, the adjustment sliding amount of the sliding sleeve 15 along the axial direction of the hydraulic cylinder 4 by the sliding adjustment means 16 and the amount of change in the amplitude of the hydraulic piston 4 match.

As shown in Figure 2, the sliding sleeve 15 is attached to the fixed sleeve 1.
If the sliding adjustment is made so that it contacts 4, the amplitude will be minimized.

When the sliding sleeve 15 is slidably adjusted in the direction away from the fixed sleeve 14 in FIG. 2, the amplitude increases and reaches its maximum in the state shown in FIG. 1.

(Effects of the Invention) Since the present invention is configured as described above, the amplitude of the hydraulic oscillator can be adjusted by simply slidingly adjusting the sliding sleeve, and the amount of adjustment of the sliding sleeve and the amount of change in amplitude can be adjusted. Since they match, the adjustment operation is easy, and it is suitable for applications that require variable amplitude.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view showing a state in which the amplitude is adjusted to the maximum and constant pressure is applied to the spool valve body and the hydraulic piston, and FIG. The figure is a longitudinal sectional view showing a state in which the amplitude is adjusted to the minimum and alternating pressure is applied to the spool valve body and the hydraulic piston. 1: Hydraulic oscillator, 2: Pilot valve housing, 3: Hydraulic cylinder, 4: Hydraulic piston, 5 Nispuru valve body, 6: Annular groove, 7: Small diameter operating rod, 8: Large diameter operating rod, 9: Constant pressure chamber,
9': Valve body reciprocating oil supply port, 10: Alternating pressure chamber, 10':
Oil supply port for valve body double action, 11: Oil supply port, 12: Output hydraulic pressure port,
13: oil drain port, 14: fixed sleeve, 15: sliding sleeve, 16 sliding adjustment means, 17: spool portion, 18: constant pressure chamber, 19: alternating pressure chamber, 20. Annular groove, 21°22
Ni brake chamber, 23: Oil supply port for piston forward movement, 24 Niji cylinder oil drain port, 25 Niji cylinder output oil pressure port, 26: Oil supply port for piston return movement, 27: Oil supply port for amplitude adjustment, 28: Oil supply pipe connection port, 29: Oil drain pipe Connection port, 30: Oil supply path, 31
: Drain passage, 32: Piston double-acting oil passage, 33: Valve body double-acting oil passage.

Claims (1)

[Scope of Claims] 1. A pilot valve housing having a constant pressure chamber and an alternating pressure chamber at both end portions, and having an oil supply port, an output hydraulic pressure port, and an oil drain port at the side portions, A spool valve body with an annular concave groove is arranged to communicate between the oil supply port and the output hydraulic pressure port, and to communicate the output hydraulic port and oil drain port when the valve moves back, and on the other hand, a medium diameter part and a large diameter part are arranged inside the hydraulic cylinder. A fixed sleeve consisting of a diameter portion and a sliding sleeve consisting of a small diameter portion and a large diameter portion are arranged with their large diameter open ends facing each other, and a spool portion is provided inside the fixed sleeve and the sliding sleeve. inserting a hydraulic piston with a fixed sleeve to form a constant pressure chamber and an alternating pressure chamber between the hydraulic piston and the fixed sleeve and the sliding sleeve, respectively, and sliding the sliding sleeve into the small diameter portion of the sliding sleeve. The large diameter portion of the fixed sleeve is provided with a piston forward movement oil supply port, a cylinder oil drain port, and a cylinder output hydraulic pressure port in order from the middle diameter portion to the large diameter opening end, The large diameter portion of the sliding sleeve is provided with a piston reciprocating oil supply port and an amplitude adjustment oil supply port near the small diameter portion and the large diameter opening end, respectively, and the outer circumferential surface of the sliding sleeve is provided with a piston reciprocating oil supply port near the small diameter portion and near the large diameter opening end. An annular groove for amplitude adjustment is formed in the spool portion of the hydraulic piston, which communicates with the oil supply port and the oil supply port for amplitude adjustment, respectively, and when the spool portion of the hydraulic piston moves forward, the cylinder oil drain port and the cylinder output hydraulic pressure port are communicated with each other, and when the piston moves back, Then, an annular groove is formed that communicates the cylinder output hydraulic pressure port and the amplitude adjustment oil supply port, and the constant pressure chamber and oil supply port of the pilot valve housing, the piston forward movement oil supply port, and the amplitude adjustment oil supply port are connected to each other. The oil drain port of the pilot valve housing and the cylinder oil drain port are respectively connected to the oil drain path, and the output hydraulic pressure port of the pilot valve housing and the piston double-acting oil fill port are connected to the piston double-acting oil path. A hydraulic oscillator with adjustable amplitude, characterized in that the cylinder output hydraulic pressure port and the alternating pressure chamber of the pilot valve housing are connected by a valve body reciprocating oil passage.