JPH0248765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic oscillator that is used by being incorporated into a civil engineering work machine, etc., and whose vibration position can be adjusted even during vibration.

(Prior art) A spool valve body that receives constant pressure and alternating pressure from both sides in a pilot valve casing, and a hydraulic piston that receives constant pressure and alternating pressure from both sides in a hydraulic cylinder. In the case of a conventional hydraulic oscillator that vibrates the hydraulic piston by its action, a piston forward movement oil supply hole, a cylinder oil drain hole, a cylinder output pressure oil hole, and a piston return movement oil supply hole provided in the hydraulic cylinder are used. Since the position is fixed, the oscillating position of the hydraulic piston remains unchanged. Therefore, conventional hydraulic oscillators cannot be used in applications requiring variable vibration position.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a hydraulic oscillator whose vibration position can be adjusted even during vibration.

(Means for Solving the Problems) In order to achieve the above object, the hydraulic oscillator according to the present invention has a constant pressure chamber and an alternating pressure chamber at both end portions, and has a constant pressure chamber and an alternating pressure chamber at both end portions. Inside the pilot valve housing, which has an oil supply hole, an output hydraulic pressure hole, and an oil drainage hole in the part, when the valve moves forward under constant pressure, the output hydraulic pressure hole and the oil drainage hole are connected, and when it moves back under alternating pressure, the oil supply hole and the output are connected. A spool valve body having an annular groove communicating with the hydraulic hole is arranged, and a sliding liner having an inner surface consisting of a medium diameter part, a large diameter part and a small diameter part is arranged inside the hydraulic cylinder, The hydraulic cylinder is equipped with sliding adjusting means for sliding a sliding liner at both ends, and a hydraulic piston consisting of a medium diameter piston part, a large diameter spool part, and a small diameter piston part is reciprocated inside the sliding liner. A constant pressure chamber and an alternating pressure chamber are formed between both ends of the large diameter spool portion and the sliding liner, and a small diameter portion is formed in the large diameter portion of the sliding liner from the middle diameter portion to the small diameter portion. A piston forward movement oil supply hole, a liner output oil pressure hole, a liner drainage oil hole, and a piston return movement oil supply hole are provided in this order in this order, and an oil supply hole for piston forward movement, a liner output oil pressure hole, and a liner output oil pressure hole are provided on the outer surface of the sliding liner. An annular groove for vibration position adjustment is formed which communicates with the liner oil drain hole and the piston reciprocating oil supply hole, respectively, and when the large diameter spool portion of the hydraulic piston moves forward under constant pressure, the piston forward movement oil supply hole and the liner output In addition, an annular groove is formed in the large diameter spool portion to communicate with the liner output hydraulic hole and the liner oil drain hole when the liner output oil pressure hole and the liner drain oil hole are communicated with each other when the large diameter spool portion is moved back by alternating pressure. The pressure chamber, the oil supply hole, and the annular groove communicating with the piston reciprocating oil supply hole are connected to the oil supply path, and the annular groove communicating with the oil drain hole of the pilot valve housing and the liner oil drain hole are connected to each other to drain oil. The output hydraulic pressure hole of the pilot valve housing is connected to the liner output hydraulic hole by the piston double-acting oil passage, and the output hydraulic pressure hole of the pilot valve housing is connected to the annular groove communicating with the piston double-acting oil supply hole. The valve body is characterized by being connected to an annular groove communicating with the valve body by an oil passage for reciprocating the valve body.

(Function) Since the present invention is configured as described above, when pressure oil is introduced into the constant pressure chamber of the pilot valve housing and the constant pressure chamber of the sliding liner through the oil supply path, the spool valve body and the hydraulic pressure are The interaction with the piston causes the hydraulic piston to vibrate. Next, even during vibration, when the sliding liner is slidably adjusted by the sliding adjustment means installed at both ends of the hydraulic cylinder, the oil supply hole for forward movement of the piston in the constant pressure chamber and the piston in the alternating pressure chamber are adjusted relative to the hydraulic cylinder. The position with respect to the reciprocating oil supply hole is changed and adjusted by the same change amount as the adjustment amount of the sliding liner, and thereby the vibration position of the hydraulic piston with respect to the hydraulic cylinder is changed and adjusted.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a hydraulic oscillator according to the present invention, and the hydraulic oscillator 1 is composed of a pilot valve housing 2, a hydraulic cylinder 3, a sliding liner 18, a hydraulic piston 4, and the like.

The pilot valve housing 2 has a constant pressure chamber 9 and an alternating pressure chamber 10 at both ends, and an oil supply hole 11, an output hydraulic pressure hole 12, and an oil drain hole on the side where the pilot valve housing 2 is attached to the hydraulic cylinder 3. Hole 13 and constant pressure chamber 9
It has a communication hole 9' communicating with the alternating pressure chamber 10 and a communication hole 10' communicating with the alternating pressure chamber 10, and when the pilot valve casing 2 moves forward under constant pressure, an output hydraulic pressure hole 12 is formed.
A spool valve body 5 is provided with an annular groove 6 which communicates the oil supply hole 11 and the output hydraulic pressure hole 12 when the spool valve body 5 communicates with the oil drain hole 13 and communicates the oil supply hole 11 with the output hydraulic pressure hole 12 when the valve moves back due to alternating pressure. A small-diameter operating rod 7 and a large-diameter operating rod 8, which are brought into contact with each other at both ends, face a constant pressure chamber 9 and an alternating pressure chamber 10, respectively.

The sliding liner 1 is placed inside the hydraulic cylinder 3.
8, and is equipped with adjusting screws 19, 20 with locking holes 23, 24 and locking nuts 21, 22 as sliding adjusting means for sliding the sliding liner 18 on both ends of the hydraulic cylinder 3. be.

The sliding liner 18 has a medium diameter portion 25 and a large diameter portion 26.
and a small diameter portion 27, and the hydraulic piston 4 has a medium diameter piston portion 15 that fits into the medium diameter portion 25, large diameter portion 26, and small diameter portion 27 of the sliding liner 18, respectively. The large-diameter spool portion 14 and the small-diameter piston portion 16 are inserted into the sliding liner 18 so as to be able to reciprocate, and a constant pressure is maintained between both ends of the large-diameter spool portion 14 and the sliding liner 18. An alternating pressure chamber 36 is formed with the chamber 34, an oil leak hole 28 is provided in the medium diameter portion 25 of the sliding liner 18, and a piston is provided in the large diameter portion 26 in order from the medium diameter portion 25 to the small diameter portion 27. A forward movement oil supply hole 29, a liner output oil pressure hole 30, a liner drain oil hole 31, and a piston return movement oil supply hole 32 are provided, and an oil leak hole 33 is provided in the small diameter portion 27, and an oil leakage hole 33 is provided on the outer surface of the sliding liner 18. is an annular groove 28 for vibration position adjustment that communicates with the oil leak hole 28, the piston forward movement oil supply hole 29, the liner output oil pressure hole 30, the liner oil drain hole 31, the piston return movement oil supply hole 32, and the oil leak hole 33. ' to 33', and the large diameter spool portion 14 of the hydraulic piston 4 is formed so that when the hydraulic piston 4 moves forward due to a constant pressure, the piston forward movement oil supply hole 29 and the liner output hydraulic hole 30 communicate with each other. The large diameter spool portion 14 is formed with an annular groove 17 which communicates the liner output hydraulic hole 30 and the liner drain hole 31 when the hydraulic piston 4 moves back under alternating pressure.

The communication hole 9' communicating with the constant pressure chamber 9 of the pilot valve housing 2, the oil supply hole 11, and the annular groove 29' communicating with the piston forward movement oil supply hole 29 are connected to the oil supply path 39, respectively, and the pilot valve housing 2 is connected to the oil supply passage 39. An annular groove 28' communicating with the oil drain hole 13 and the oil leak hole 28 of No. 2
An annular groove 31' communicating with the liner oil drain hole 31 and an annular groove 33' communicating with the oil leak hole 33 are connected to the oil drain passage 40, respectively, and the output hydraulic pressure hole 12 of the pilot valve housing 2 and the piston are connected to each other. The annular groove 32' that communicates with the double-acting oil supply hole 32 is connected to the piston double-acting oil passage 4.
1, and a communication hole 10' that communicates with the alternating pressure chamber 10 of the pilot valve housing 2 and an annular groove 30' that communicates with the liner output hydraulic pressure hole 30 are connected by a valve body return oil passage 42. There is. When the hydraulic piston 4 vibrates, the piston forward movement oil supply hole 2
9 and the piston reciprocating oil supply hole 32 are closed by the large diameter spool part 14, and the medium diameter part 2 of the constant pressure chamber 34 is closed by the large diameter spool part 14.
5 and a portion of the alternating pressure chamber 36 closer to the small diameter portion 27 are designed to serve as brake chambers. In the figure, 37 is an oil supply pipe connection port that connects the oil supply path 39 to a hydraulic power source (not shown), and 38 is an oil drain pipe connection port that connects the oil drain path 40 to a tank (not shown).

Since the embodiment of the present invention is configured as described above, when pressure oil is supplied from a hydraulic power source (not shown) to the oil supply passage 39 through the oil supply pipe connection port 37, the pressure oil is supplied to the communication hole 9' and the piston reciprocating port. The oil is introduced into the constant pressure chamber 9 of the pilot valve housing 2 and the constant pressure chamber 34 of the sliding liner 18 through the annular groove 29' communicating with the oil supply hole 29, and as shown in FIG. In this case, the spool valve body 5 moves forward in the direction of the alternating pressure chamber 10 via the small diameter operating rod 7, and
In the sliding liner 18 , the hydraulic piston 4 begins its forward movement in the direction of the alternating pressure chamber 36 . At this time, due to the forward movement of the spool valve body 5, the alternating pressure chamber 36 in the sliding liner 18 is opened to the piston return movement oil supply hole 3.
2, annular groove 32', piston reciprocating oil passage 41,
It communicates with a tank (not shown) through the output hydraulic pressure hole 12 of the pilot valve housing 2, the annular groove 6, the oil drain hole 13, the oil drain path 40, and the oil drain pipe connection port 38. Next, in the process of forward movement of the hydraulic piston 4, as shown in FIG. Hole 30, annular groove 3
0', the valve body is introduced into the alternating pressure chamber 10 of the pilot valve housing 2 through the oil passage 42 and the communication hole 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 back toward the constant pressure chamber 9. When the spool valve body 5 moves back, it passes through the annular groove 6 to the oil supply hole 11.
The output oil pressure hole 12 communicates with the oil supply hole 1, and the pressure oil
1. The oil is introduced into the alternating pressure chamber 36 of the sliding liner 18 through the annular groove 6, the output hydraulic pressure hole 12, the piston reciprocating oil passage 41, the annular recess 32', and the piston reciprocating oil supply hole 32. Since the pressure receiving area of the hydraulic piston 4 in the alternating pressure chamber 36 is larger than the pressure receiving area of the hydraulic piston 4 in the constant pressure chamber 34, the hydraulic piston 4 starts to move back toward the constant pressure chamber 34. . Next, in the process of backward movement of the hydraulic piston 4, the liner output hydraulic hole 30 and the liner oil drain hole 31 are connected to the annular groove 17 of the large diameter spool portion 14.
When communicated through, the alternating pressure chamber 10 of the pilot valve housing 2 is connected to the communication hole 10', the oil passage 42 for valve body return movement,
It communicates with a tank (not shown) through an annular groove 30', a liner output oil pressure hole 30, an annular groove 17, a liner oil drain hole 31, an annular groove 31', an oil drain passage 40, and an oil drain pipe connection port 38. As the pressure within the alternating pressure chamber 10 decreases, the spool valve body 5 is pressed by the small diameter operating rod 7 and moves forward toward the alternating pressure chamber 10. As a result, the alternating pressure chamber 36 of the sliding liner 18 communicates with the tank (not shown) as described above, and the pressure inside the alternating pressure chamber 36 decreases, so that the hydraulic piston 4
is pressed by the pressure oil in the constant pressure chamber 34 and moves toward the alternating pressure chamber 36. When the hydraulic piston 4 moves forward and the piston backward movement oil supply hole 32 is closed by the large diameter spool portion 14, oil is sealed in the portion of the alternating pressure chamber 36 near the small diameter portion 27, and the brake is applied. occurs. Similarly, hydraulic piston 4
When the piston reciprocates and the piston forward movement oil supply hole 29 is closed by the large diameter spool portion 14, oil is sealed in a portion of the constant pressure chamber 34 near the middle diameter portion 25, producing a braking action. Thereafter, the above-described operation is repeated. As described above, the interaction between the spool valve body 5 within the pilot valve housing 2 and the hydraulic piston 4 within the sliding liner 18 causes the hydraulic piston 4 to vibrate.

Next, in order to adjust the vibration position, loosen the locking nuts 21 and 22 while the vibration is stopped or during vibration, make the adjustment screws 19 and 20 rotatable, and insert a rotating tool (not shown) into the locking hole 23, 24, loosen one adjustment screw, and screw in the other adjustment screw to slide the sliding liner 18 a desired distance along the hydraulic cylinder 3, and then tighten the locking nuts 21 and 22. It is. When the sliding liner 18 is slidably adjusted as described above, the sliding liner 18
The positions of the piston forward movement oil supply hole 29 of the constant pressure chamber 34 and the piston return movement oil supply hole 32 of the alternating pressure chamber 36 are changed and adjusted with respect to the hydraulic cylinder. The vibration position of No. 4 is changed and adjusted. At this time, since the relative positions of the piston forward movement oil supply hole 29 and the piston return movement oil supply hole 32 remain unchanged, the amplitude does not change. Adjustment screw 19 as shown in FIG.
When screwed in to the maximum limit, the vibration position becomes the highest position, and as shown in Fig. 2, when the adjustment screw 20 is screwed in to the maximum limit, the vibration position becomes the lowest position, and the adjustment allowance by the adjustment screws 19 and 20 becomes the lowest position. There is a one-to-one ratio between the amount of change in vibration position and the amount of change in vibration position. Furthermore, when the hydraulic piston 4 vibrates, the constant pressure chamber 34 and the alternating pressure chamber 3
Hydraulic piston 4 due to high brake pressure generated within 6
Oil leaking between the medium diameter piston part 15 and the medium diameter part 25 of the sliding liner 18 and between the small diameter piston part 16 of the hydraulic piston 4 and the small diameter part 27 of the sliding liner 18 is leaked through the oil leak hole 28. 33, the oil is collected into a tank (not shown) via the oil drain path 40 and the oil drain pipe connection port 38.

(Effects of the Invention) According to the present invention, the amount of adjustment of the sliding liner by the sliding adjustment means provided at both ends of the hydraulic cylinder is the same as the amount of change in the vibration position of the hydraulic piston. It is possible to provide a hydraulic oscillator capable of adjusting the vibration position, in which the vibration position of the hydraulic piston can be easily changed and adjusted even during vibration by predicting the change in vibration position and simply adjusting the sliding liner. Summer.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing a state in which the vibration position is adjusted to the uppermost position and constant pressure is applied to the spool valve body and the hydraulic piston; FIG. 2 is a longitudinal sectional view showing a state in which the vibration position is adjusted to the lowest position 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: Spool valve body, 6: Annular groove, 7: Small diameter operating rod, 8: Large diameter operating rod, 9: Constant pressure Chamber, 9': Communication hole, 10: Alternate pressure chamber, 10': Communication hole, 11: Oil supply hole, 12:
Output hydraulic hole, 13: Oil drain hole, 14: Large diameter spool section, 15: Medium diameter piston section, 16: Small diameter piston section, 17: Annular groove, 18: Sliding liner, 19,
20: Adjustment screw, 21, 22: Lock nut, 2
3, 24: Locking hole, 25: Medium diameter part, 26: Large diameter part, 27: Small diameter part, 28: Oil leak hole, 29: Piston forward oil supply hole, 30: Liner output hydraulic hole, 3
1: Liner oil drain hole, 32: Piston reciprocating oil supply hole, 33: Oil leak hole, 28' to 33': Annular groove for vibration position adjustment, 34: Constant pressure chamber, 36: Alternating pressure chamber, 37: Oil supply pipe connection port, 38: Oil drain pipe connection port,
39: Oil supply passage, 40: Oil discharge passage, 41: Piston return-action oil passage, 42: Valve element return-action oil passage.

Claims (1)

[Claims] 1 Has a constant pressure chamber and an alternating pressure chamber at both ends,
Moreover, inside the pilot valve case, which has an oil supply hole, an output hydraulic pressure hole, and an oil drain hole on the side, when it moves forward under constant pressure, the output hydraulic pressure hole and the oil drain hole are connected, and when it moves back under alternating pressure, it communicates with the oil supply hole. A spool valve body having an annular groove communicating with the output hydraulic pressure hole is arranged, and a sliding liner having an inner surface consisting of a medium diameter part, a large diameter part and a small diameter part is arranged inside the hydraulic cylinder. , and is equipped with sliding adjusting means for sliding a sliding liner on both ends of the hydraulic cylinder, and a hydraulic piston consisting of a medium diameter piston part, a large diameter spool part, and a small diameter piston part is reciprocated inside the sliding liner. movably inserted,
A constant pressure chamber and an alternating pressure chamber are formed between both ends of the large diameter spool portion and the sliding liner, and a piston is provided in the large diameter portion of the sliding liner in order from the middle diameter portion to the small diameter portion. A moving oil supply hole, a liner output oil pressure hole, a liner drain oil hole, and a piston return oil supply hole are provided, and the outer surface of the sliding liner is provided with a piston forward movement oil supply hole, a liner output oil pressure hole, a liner oil drain hole, and a piston. An annular recessed groove for vibration position adjustment is formed which communicates with the reciprocating oil supply hole, respectively, and when the large diameter spool portion of the hydraulic piston moves forward under constant pressure, the piston forward movement oil supply hole communicates with the liner output hydraulic hole. In addition, the large diameter spool part is formed with an annular groove that communicates the liner output hydraulic hole and the liner oil drain hole when the liner moves back due to alternating pressure, and connects the constant pressure chamber and oil supply hole of the pilot valve housing. An annular groove communicating with the oil supply hole for piston forward movement is connected to the oil supply path, an annular groove communicating with the oil drain hole of the pilot valve housing and a liner oil drain hole are respectively connected to the oil drain path, An annular groove that connects the output hydraulic pressure hole of the pilot valve housing and an annular groove that communicates with the piston reciprocating oil supply hole through a piston reciprocating oil passage, and that communicates with the alternating pressure chamber of the pilot valve housing and the liner output hydraulic hole. A hydraulic oscillator whose vibration position can be adjusted, characterized in that a hydraulic oscillator is connected to a valve body by an oil passage for reciprocating the valve body.