JPS59180103A - Hydraulic vibrator - Google Patents

Abstract

PURPOSE:To obtain a small-sized hydraulic vibrator with a large frequency and slight abrasion of a sliding part by providing, as a direction control valve, an oil pressure pilot piston cylinder unit to a hydraulically vibrating piston cylinder unit. CONSTITUTION:A pilot cylinder unit is formed by a cylinder main body 1 and a pilot piston 2. A pressure oil port 3 and a drain port 4 are provided in the cylinder main body 1. Ducts 15, 15' of a vibratory cylinder main body 11 are connected to both ducts 6, 6', provided in the pilot cylinder main body 1, and further communicate with both ends of a cylinder 12. A duct 7 of the pilot cylinder main body 1, connected to a duct 14 in the center of the cylinder 12, is in communication with a ring chamber 12a, while pilot ducts 8, 8' are connected to pilot ducts 16, 16' of the vibratory cylinder main body 11. The pilot duct 16 communicates with a ring chamber 12b' on the right of the cylinder 12, while the pilot duct 16' communicates with a ring chamber 12b on the left of the cylinder 12.

Description

[Detailed description of the invention] The invention relates to hydraulic vibrators.

Conventional vibrators include mechanical vibrators, pneumatic vibrators, electrical vibrators, and the like. Mechanical vibrators and pneumatic vibrators; Yamako and electric vibrators both cannot obtain high frequencies, have large wear on sliding parts, and must have large vibration generators in order to obtain large outputs. There were some drawbacks, such as: □
The present invention is based on the object of creating a hydraulic vibrator with a high vibration frequency and low wear on sliding parts, and in which the vibrating device is kept small in order to obtain the required output.

The present invention will be explained in detail based on the drawings.

In the figure, 1 indicates a pilot cylinder body, and 11 indicates a vibrator cylinder body. The pilot cylinder unit consists of a cylinder body 1 and a pilot piston 2. A pressure oil boat 3 and a drain port 4 are attached to the cylinder body 1. Pilot cylinder 5 is medium heat ring% 5a
and each ring chamber 5b, 5b' adjacent thereto, and each link %5c adjacent to each ring chamber 5b, 5-o', respectively.
, 5c' and cylinder chambers 5d, 56 . ' and cylinder chambers 5e, 5e' connected thereto for the auxiliary piston 6.6', and the ends of the cylinder chambers 5θ, 5θ' are shaped into cylinder chambers 5f, 5f' having a slightly larger diameter.
9 cylinder chambers 5b, 51)' which are J2 are duct)
Vibrating cylinder body 1 separately through 6.6”
It communicates with the left and right pressure camera ducts 15 and 15' of 1.

The other two cylinder chambers 5c, 5c' communicate with each other through a duct 7 and are connected to a duct 14 in the center of the vibration cylinder body 11. Both cylinder chambers 5f and 5f' at both ends are connected to the pilot duct of the vibration cylinder body 11 via the pilot ducts 8 and 8', respectively.i6. Connected to i6'. The pilot piston 2 is hollow and has a +J medium heat piston ring 2a on its outer periphery, and two piston rings 2b and 2b' at both ends of the piston, which are provided through a portion with a smaller diameter than this piston ring 2a. The pistons 2c, 2c' are hollow and extend adjacent to both piston rings 2b, 2b' of the pilot piston 2, and are connected to each auxiliary piston 2c, 2c' and each piston ring 2b, 2b'. There are 2 radial through holes between each
d and 2d' are attached.

A vibrating piston 16 is fitted into the cylinder 12 of the vibrator cylinder body 11 so as to be movable in the axial direction. The vibrating piston 13 has two piston rings i3b, i3b' spaced apart from each other by a central rod part 13a, and piston rings 13a, 13a' and both piston rings i3a, It consists of short rod parts 13e and 13e' that protrude from i3a' to both outer ends, and extends in the axial direction over the outer periphery of the central rod part 13a, both piston rings 13b, i5b', and rod parts 13c and 13c'. A groove 15f is formed. Since g13f passes through both piston rings 13b, 13b', piston rings 13b, i3b' only serve for sliding guidance. On the other hand, on the inner circumference of the cylinder 12, there is one ring chamber 12a at the center and two ring chambers 12b and +2b' at both ends. A portion of the cylinder 12 remains adjacent to both ring chambers +2b, 12'b'. The left and right ducts 15, 15+ formed in the vibrator cylinder body 11 are connected to both ducts 6.6' attached to the pilot cylinder body 1 and OI.
They are liquid-tightly connected via a joint 17. left and right)
15 and 15' communicate with both end portions of the cylinder 12, respectively. The duct 7 of the pilot cylinder body 1 is connected to the duct 14 in the center of the cylinder 12 via a Q ring 17. The central duct 14 passes through the central ring chamber 12aVC'y of the cylinder 12. Pilot cylinder body 1 bar/fpt duct) 8.8'
is connected to the pilot ducts 16 and 16' of the vibrator series/remain body 11 via an O-ring 18. One pilot duct 16 is a ring chamber 1 on the right side of the cylinder 12.
2bVC1 and the external pilot duct 16' communicate with the left ring chamber 12'D.

The hydraulic vibrator according to the present invention functions as follows.

When pressure oil flows in from the pressure port 3, it passes through the right side of the piston ring 2a at the center of the pilot piston 2, flows into the link chamber 5b', moves the pilot piston 2 to the left, and the pressure oil The capital OV at the right end of the simultaneous VC vibrator cylinder 12? :, flows in and moves the vibrating piston 13 to the left. At this time, the left end of the vibrating piston 13 / cylinder portion 1
The oil is discharged to the drain boat 4 through the duct 15. At the end of the leftward movement of the vibrating piston 13, the cylinder 1
Pressure oil flows into the second ring chamber 12b' and further flows into the cylinder i5f via the pilot duct 16, thereby switching the auxiliary piston 2C of the pilot piston 2 to the right. As a result, the pilot piston 2 moves to the right end position, contrary to the illustration.

In this state, the pressure oil flowing from the pressure oil boat 3 flows through the left side of the medium-heated piston/ring 2a, flows into the ring chamber 51oVC, and then flows into the left end portion of the vibration cylinder 12 through the duct. to push the vibrating piston 13 back to the right. Oil flows out from the right end portion of the vibrating cylinder 12 to the drain boat 4 through a duct. Vibrating piston 13
groove 13f at the end of the stroke to the right.

The pressure oil flows through the ring chamber 12b through the left rod portion 13ci of the piston ring 17Ib, and then through the pilot duct into the cylinder chamber 5f' at the right end of the pilot cylinder 2. As a result, the pilot piston occupies the position shown in the second figure.

Vibration of the vibrating piston 13 is effected by repeating the actuation process of the two pistons 2.16 described above.

According to the present invention, by hydraulically switching the pilot valve that is coaxial with the vibrating piston and the cylinder, the vibration of the vibrating piston can be smoothly performed without oil leakage, and as a result, the flow rate can be increased. Accordingly, a high vibration frequency of several hundred hertz can be obtained.A vibrating piston can be formed with a vibration stroke set to an arbitrary size.It is less noisy than a pneumatic vibrator, and moreover, it is less noisy than a conventional vibrator. High vibration frequencies that could not be achieved with other systems can be obtained.Since the size of the pilot piston-cylinder unit is independent of the size of the oscillating piston-cylinder, switching is achieved with a small flow rate to the pilot cylinder, thus allowing arbitrary It can be applied to vibrating piston cylinders with a flow rate of

The hydraulic vibrator according to the present invention may also have a vibrating piston enclosed in a vibrating cylinder (as shown), or one end 11561 or 138' of the vibrating piston or both ends j3e, 13e.
' can also be implemented in a form in which it protrudes outward from the vibration cylinder main body 11. Machining of the hydraulic vibrator is also extremely easy. As a result, the hydraulic vibration ψ according to the present invention can be used in a narrow range of technical fields, for example, for construction work, civil engineering work, and as various vibration testing machines.

[Brief explanation of drawings]

The drawing shows a central sectional view of a hydraulic vibrator according to the invention. Symbol 1 in the figure...Pilot cylinder body 2...Pilot piston 5...Pilot cylinder 11...Vibration cylinder body 12...Vibration cylinder 13...Vibration piston agent Hikaru Esaki 7+;: H,,,, :-::
□,'1

Claims (1)

[Claims] (1) Hydraulic vibrating piston cylinder unit (jl, 12
A hydraulic vibrator characterized in that a hydraulic pilot piston cylinder unit (1, 2, 5) serving as a directional control valve is attached to 13). (2) The hydraulic vibrating piston (16) is connected to the vibrating cylinder body (
11) The hydraulic vibrator according to claim 1, which is included in the hydraulic vibrator. (6) Piston rond of hydraulic photography piston (13)!
ifa (13e or 13e') or both ends (13e, 1
3e') protrudes outward from the vibrating cylinder body (11).