JPS5949120B2 - hydraulic compression device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a hydraulic cylinder device of a type in which a small-diameter cylinder and a large-diameter cylinder are vertically mounted with a small-diameter piston, a large-diameter piston, and a piston rod having a compression plate, and related structures thereof. Regarding hydraulic compression devices, to the best of the applicant's knowledge, this type of compression device has not yet been proposed.

That is, an object of the present invention is to quickly move the piston rod up and down in a no-load state using a small amount of low-pressure oil, thereby saving power and shortening the waiting time when handling compressed objects. Therefore, the object of the present invention is to provide a hydraulic compression device that can improve work efficiency.

Another object of the present invention is to provide a hydraulic compression device that can quickly and automatically switch hydraulic circuits.

Another object of the present invention is to provide a hydraulic compression device that can automatically control compression at a set desired pressure.

Next, an embodiment of the present invention that can achieve the above object will be described in detail with reference to the attached block diagram.

A indicates an oilfield cylinder device, which is constructed as follows.

That is, 1 is a small diameter cylinder, 2 is a large diameter cylinder, and 3 is a piston rod having a small diameter piston 3a and a large diameter piston 3b. 3a and large-diameter piston 3b, the inside of the small-diameter cylinder 1 is divided into a royal chamber 1a and a lower chamber 1b, and the inside of the large-diameter cylinder 2 is divided into an upper chamber 2a and a lower chamber 2.
It is divided into b.

A compression plate 4 is attached to the lower end of the piston rod 3.

5 is a hydraulic power source, 6 is a servo valve, 7 is a first auxiliary oil tank, 8
1 is a second auxiliary oil tank, 9 is a first check valve with a first hydraulic device 9a, 10 is a second check valve with a second hydraulic device 10a, 11 is a first pressure oil pipe for a small diameter cylinder, and 12 is a small diameter cylinder. 13 is a set pressure opening/closing valve 13
The first E oil pipe for the large diameter cylinder has a symbol 14, and the second E oil pipe 14 for the large diameter cylinder has a set pressure opening/closing valve 14a, and these are connected as follows.

(i) The discharge side of the servo valve 6 and the upper chamber 1a of the small diameter cylinder 1 are connected by a small diameter cylinder pressure oil pipe 11,
The suction side of the servo valve 6 and the lower chamber 1b of the small diameter cylinder 1 are connected by a second pressure oil pipe 12 for the small diameter cylinder.

(11) Upper chamber 2a of large diameter cylinder 2 and first hydraulic device 9a
are connected by a first pressure oil pipe 13 for a large diameter cylinder.

(iii) The lower chamber 2b of the large-diameter cylinder 2 and the second hydraulic device 10a are connected by a second pressure oil pipe 14 for the large-diameter cylinder.

(1ψ The first check valve 9 and the lower chamber 2b of the large diameter cylinder 2 are connected by an oil pipe 15, and the second check valve 1
0 and the upper chamber 2a of the large diameter cylinder 2 are connected by an oil pipe 16.

(V) Note that the first E oil pipe 13 for large diameter cylinders is branched from the first pressure oil pipe 11 for small diameter cylinders, and the second pressure oil pipe 14 for large diameter cylinders is branched from the second royal oil pipe 12 for small diameter cylinders.

77 is a load detector provided on the compression plate 4, 18 is an amplifier, 19 is an addition/subtraction calculator, 20 is a setting voltage generator, 21 is a servo amplifier, and 22 is an anastomosis to be compressed. , the signal from the load detector 17 is transmitted to the addition/subtraction calculator 19 via the amplifier 18, and the addition/subtraction calculator 19 subtracts the signal from the setting voltage generator 20, and the subtracted value is transmitted via the servo amplifier 21. It is configured such that the signal is transmitted to the operating mechanism of the servo valve 6.

In the configuration on paper, when the piston rod 3 is in the upward position shown, the servo valve 6. Upper chamber 1 of small diameter cylinder 1 via first pressure oil pipe 11 for small diameter cylinder
Supply pressure oil to a.

In such a case, as the piston rod 3 descends, the lower chamber 1
The pressure oil in b is returned to the hydraulic pressure source 5 from the second pressure oil pipe 12 for the small diameter cylinder via the servo valve 6, and is returned to the hydraulic pressure source 5 for the large diameter cylinder 2.
The pressure oil in the lower chamber 2b flows into the first auxiliary oil tank 7 through an oil pipe 15 having a first check valve 9.

(Note: The set pressure on-off valves 13a and 14a are closed,
The first check valve 9 is opened via the first hydraulic device 9a by pressure oil flowing from the first pressure oil pipe 13 for the large diameter cylinder which is branched from the first pressure oil pipe 11 for the small diameter cylinder.

) At the same time as the above action, a part of the pressure oil that is returned to the hydraulic power source 5 from the second E oil pipe 12 for the small diameter cylinder is transferred to the second hydraulic device 10a via the second hydraulic pipe 14 for the large diameter cylinder. However, since this circuit is at low pressure, the second check valve 10 is not opened.

Then, the upper chamber 2a becomes negative pressure and the second auxiliary oil tank 8
The oil in the second auxiliary oil tank 8 flows into the upper chamber 2a due to atmospheric pressure acting on the liquid level therein.

(Note: The second check valve 10 is automatically opened.

) Also, the piston rod 3 is raised by feeding pressure oil into the royal chamber 1b of the small diameter cylinder 1 via the second E oil pipe 12 for the small diameter cylinder.

As the piston rod 3 rises, the pressure oil in the upper chamber 1b is returned to the oil pressure source 5 from the first pressure oil pipe 11 for the small diameter cylinder via the servo valve 6, and the pressure oil in the upper chamber 2a of the large diameter cylinder 2 is returned to the first pressure oil pipe 11 for the small diameter cylinder. The oil flows into the second auxiliary oil tank 8 through an oil pipe 16 having a two-check valve 10.

(Note: The second check valve 10a is closed by the pressure oil from the second E oil pipe 14 for the large diameter cylinder, which is branched from the second pressure oil pipe 12 for the small diameter cylinder, via the second hydraulic device.

) At the same time as the above action, the inside of the lower chamber 2b of the large-diameter cylinder 2 becomes negative pressure, and atmospheric pressure acts on the liquid level in the first auxiliary oil tank 7, so that the oil in the first auxiliary oil tank T is the lower chamber 2
b.

(Note: The lower chamber 2b of the large diameter cylinder 2 has a negative pressure.
The atmospheric pressure acts on the liquid level in the first auxiliary oil tank 7, and the first check valve 9 is automatically engaged.

) Next, we will explain the case where an object to be compressed (for example, a synthetic resin, a metal material, etc.) is placed on the anastomosis 22 to be compressed. By lowering the piston rod 3 that operates as described above, it is compressed by the compression plate 4. The work is carried out, but at the same time a load higher than the set pressure is applied to the first pressure oil pipe 11 for the small diameter cylinder, the set pressure on-off valve 13a is opened, and the pressure oil is transferred to the first pressure oil pipe 11 for the large diameter cylinder.
It is supplied into the upper chamber 2a of the large diameter cylinder 2 via the pressure oil pipe 13.

The degree of compression is detected by the load detector 17, and the signal from the load detector 17 is transmitted to the addition/subtraction calculator 19 via the amplifier 18. Then, the subtracted value is used to control the servo valve 6 via the servo amplifier 21.

The set pressure opening/closing valve 14a is used when performing reverse compression, that is, tension work, and in this case, the previous flow is reversed to that described above.

Hereinafter, one embodiment of the present invention has been described.
, 2 and 2 auxiliary oil tanks 7, 8 are preferably single, and for clarity of explanation, they are described separately, including in the claims.

Since the present invention is configured as described above, the following effects can be obtained.

(1) Vertical movement of the piston rod under no load,
Since it can be carried out quickly with a small amount of low-pressure oil, it is possible to save power, reduce waiting time when handling the material to be compressed, and improve work efficiency.

(II) Hydraulic circuits can be switched quickly and automatically.

(I) The gauze at a set desired pressure can be automatically controlled.

GV) From the point of (I), a dog with higher working efficiency can be obtained, and costs can be reduced accordingly.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the hydraulic child wire device according to the present invention. a...Hydraulic cylinder device, 1...Small diameter cylinder, 1a...Upper chamber, 1b...Lower chamber, 2...Large diameter Cylinder, 2a...Upper chamber, 2b...Lower chamber, 3...Piston rod, 3a...Small diameter piston, 3b...
・Large diameter piston, 4... Compression plate, 5...
・Hydraulic power source, 6...Servo valve, 7...
・First auxiliary oil tank, 8...Second auxiliary oil tank, 9...
...First check valve, 9a...First hydraulic device, 10...Second check valve, 10a.
...Second hydraulic device, 11...First pressure oil pipe for small diameter cylinder, 12...Second pressure oil pipe for small diameter cylinder, 13......Large diameter cylinder 1st pressure oil pipe for
3a...Setting pressure on/off valve, 14...Second pressure oil pipe for large diameter cylinder, 14a...Setting pressure on/off valve, 15, 16...Connection Oil pipe, 17...
...Load detector.

Claims (1)

[Claims] 1 A small-sized piston rod that operates in a small-diameter cylinder and a large-diameter cylinder, and has a small-diameter piston, a large-diameter piston, and a single piston rod having a compression plate installed vertically in both cylinders and led out from a hydraulic source via a servo valve. A first pressure oil pipe for the cylinder and a second pressure oil pipe for the small diameter cylinder are connected to the upper chamber of the small diameter cylinder and the royal chamber, and one end of the first oil pipe for the large diameter cylinder is connected to the first pressure oil pipe for the large diameter cylinder, which is branched from the first pressure oil pipe for the small diameter cylinder. , communicates with the royal cylinder of the large-diameter cylinder via a set pressure on-off valve that opens when a load equal to or higher than the set pressure is applied, and communicates the other end with the first hydraulic machine, and opens and closes the first hydraulic machine with the first hydraulic machine.
A second pressure oil pipe for the large diameter cylinder, with one end of the oil pipe having a check valve communicating with the lower chamber of the large diameter cylinder, and the other end connected to the first auxiliary oil tank, branching from the second pressure oil pipe for the small diameter cylinder. One end of the oil pipe has one end communicating with the royal cylinder of the large diameter cylinder, the other end of which communicates with the second pressure oil device, and has a second check valve that is opened and closed by the second pressure oil device. A hydraulic compression device, characterized in that the compression plate is connected to an upper chamber, the other end is connected to a second auxiliary oil tank, and the compression plate is provided with a load detector for controlling a servo valve.