JPS584024A - Pressure generator - Google Patents

Abstract

PURPOSE:To eliminate the occurrence of noise and vibration by a method in which the speed of a piston is abruptly reduced by closing an intermediate port as the piston goes down and the pressure of a working oil confined below the piston is abruptly raised. CONSTITUTION:When a switch valve 8 is operated to supply pressure oil from an oil-pressure pump 5 through a conduit 9 from the upper port 2 to the upper part of the cylinder 1 under the condition that a piston 12 is present at the upper end of the cylinder 1, the piston 12 goes down with a piston rod 13 and a weight 14. Also, when an intermediate port 4 is closed by the piston 12, the piston 12 is stopped. In this case, the kinetic energies of the piston 12, the piston rod 13, and the weight 14 are transmitted through pressure oil confined in the cylinder 1 to the cylinder 1, the leg 15, and the pile W. After the pile W is driven, the switch valve 8 is switched to lift up and restore the piston 12 to its original position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure generating device applied to a pile driving machine, a punching press machine, etc.

Pile drivers or hydraulic presses used in civil engineering or twisting construction work are required to be free of noise and slow movement when the work site is close to human residences. However, there are no existing pile driving machines, punching presses, etc. of this type that have satisfactory functions, and the industry is currently strongly demanding the development of such machines. In view of this, the gist of this invention, which aims to provide a round pressure generating device that generates noise and vibration, is to provide a middle boat on the upper side of the lower end of a cylinder whose upper and lower ends are sealed, and to move the screws in the cylinder to the upper part of the cylinder. The supply of O pressure oil and the O# oil from the middle boat accelerate downward to give kinetic energy to the piston and its integral parts, and the piston descends and the middle part closes the piston, causing the piston to suddenly move. Decelerates and moves the piston downward
11l! The hydraulic pressure suddenly rises to break the hydraulic pressure.
It is something to do.

The ζO invention will now be described in detail based on the disclosed embodiments.

EXAMPLE 1 This example shows a case in which this invention is applied to pile driving.L1
The cylinder l is sealed at both upper and lower ends, and has an upper port (-)- at the upper end of the cylinder, and a lower port (-) J at the lower end. The height (m) within the lower end of l (m) to the upper end of the middle boat trough is formed to be equal to the upper and lower parts 11 of the piston saw, which will be described later. Upper boat and switching valve l are conduit 9
The central boat connection and the check valve 16 are connected to the switching valve IK by a conduit lO, and the check valve 14
is connected to the lower port) J. Hydraulic pump jtf check as oil pressure m The piston passes through the lower end surface of the piston lid in an airtight manner so that it can slide in an airtight manner.
, 6°/ J fl t/ ! J > IP / lower f
The lower end of the leg lj is detachably fixed to the upper end of the stake W.

Next, the operation of this embodiment will be explained. When the piston saw is located at the foreshadowing line at the upper end of the cylinder L, the switching valve L is operated and the hydraulic pump J supplies zero pressure forceps from the upper boat to the upper part of the cylinder / via the conduit D, and the piston saw moves to the piston reflex 1 Hehe, the weight is accelerated by the pressure oil and its own weight, and it descends. When the lower end of the piston lλ reaches the upper end of the Chubu Boat 3 and the Chubu Boat 3 starts to close, the piston reaches its maximum descending speed and decelerates to the J Kojikan.
When the lower end of the piston lλ reaches the lower end of the middle boat 4I and the middle boat 4I is closed, the piston lλ stops. In this case, the energy of the motion possessed by the piston L, piston rod J, weight l, etc. is transferred to the cylinder leg via the pressure oil that is densely filled in the cylinder l below the lower end. part/j and the pile WK are transmitted, and the pile W is driven downward. After the pile "W" is driven, switch the switching valve t and connect the conduit 9.
connect the tank//llz and the conduit 1oti to the discharge port of the noodle I pump I, raise the piston/J, and complete the pile driving cycle (111)/recycle ζ from now on.

A case in which this invention can be applied to a punching press machine is shown in Fig. 2, where the same reference numerals as in Fig. 1 are used to designate the same member shapes as those in Fig. 1. 11, but the legs 71 are installed on the floor. The 17th company building is a hydraulic cylinder, which is located in the t, tVh-frames shown in the figure, and the upper die lde is connected to the lower end of the bisshin-rad it, and the lower die lde is opposite to the upper die lde. is fixed on the shelf rod. At the upper end of the oil cylinder 17, there is a safety check valve, a conduit connected to the lower boat J through the check valve, a check valve, and a switchover valve JJ. It is connected to the pressure pump λ6 and the large conduit 7 through the check valve JJa upper boat side to? The conduit Jt is arranged so that the check function can be released by pressure II. In addition, the lower end of the 111J hydraulic cylinder 17 is connected to the 111J switching valve control via a conduit 19.
Damn it, Monkiri switching valve! The tank JO is also configured to communicate with the tank JO.

1k, switching valve l and happy Jlff switching valve! This is a proverb: After the switching valve Jj is operated, the switching valve L should be operated after a predetermined time lag. An operating device is provided which includes the following.

In this embodiment, a punched pan-shaped sheet metal P is formed on the upper surface of the lower die JO, and the J switching valve -! When the second hydraulic pump λ4 supplies O-pressure oil to the upper part of the hydraulic cylinder lφ, the upper die 19 descends and approaches the sheet metal P.

When the ζO# switching valve l is operated, the pressure oil from the hydraulic pump j is supplied to the upper port, and the check function of the pilot check valve here is released.The 0 piston/- is tlOl.
It descends steadily and the hydraulic oil is discharged from the central boat stop, but after the piston/J blocks the central boat stop, the hydraulic oil below the piston/JO eats up the piston/J. It is subjected to great auspicious pressure due to the kinetic energy of ζ
First hydraulic cylinder 170 via conduit JJ
Supplied to the upper part, the upper die IT suddenly receives a strong pressing force and punches out the sheet metal P by the cooperation of the lower die JO and O. After that, the switching valve L and the switching valve K are switched, and the piston /J, return to the upper part of the upper die and do the work by yourself.
Cycles are sold.

According to this invention, as described above, both upper and lower ends are sealed and the cylinder is provided with a middle boat in addition to the upper hoard and the lower boat, and the piston is accelerated downward by pressure oil from the upper boat, and the piston and the The structure is such that the lower piston blocks the middle boat, causing the piston, etc. to suddenly decelerate and generate large pressure in the cylinder below the piston. Therefore, when used in a pile driver, vibration and noise are not an issue, making it suitable for construction work in urban areas, and when used in a punching press, it produces less vibration and noise compared to presses that use inertia. Shockingly hitting the same number as the inertial press machine
The durability of the upper die and the lower die is as good as that of china clay because the die is not forced to punch at a low speed as in the case of a normal hydraulic press. In addition, by increasing the weight of this inventor's screw, the weight and piston head can be omitted.

[Brief explanation of the drawing]

The figure shows an explanatory diagram of the first implementation MC of the present invention, and Figure 1 is an explanatory diagram of the practical example of the present invention. l...Cylinder, λ...Upper boat, J...Lower boat, Ri...Middle hoard, l Co...Piston. Patent applicant: Tomio Gakukino

Claims (1)

[Claims] A screw is cast into a cylinder whose upper and lower ends are sealed, and an upper boat and a lower boat are installed at both the upper and lower ends of the cylinder, respectively, and a middle boat is installed on the cylinder side at a predetermined O height from the lower end, and a pressure oil source is installed. The upper boat and the middle boat/lower boat are alternately supplied with pressurized oil via a switching valve, and the middle boat is closed when the VX) is lowered. A pressure generating device characterized by a t'L friend.