JPS6215986Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic tool for compression connection of power distribution lines.

A hydraulic tool for compressing power distribution lines consists of a head and a pump section, and when the entire tool is installed and used at a high place, it needs to be particularly small and lightweight.

This type of compression tool uses ultra-high pressure of about 700 kg/cm ² , so if it is controlled directly by a solenoid valve,
This is large and heavy, and it is difficult to secure a power source for driving it. Conventionally, therefore, a type has been used in which a separate pilot hydraulic pressure is controlled at an ultra-high pressure, and the pilot hydraulic pressure is controlled by a relatively small electromagnetic valve. However, in this case, it is necessary to install a separate pump for pilot hydraulic pressure and associated valves, which contributes to the increased weight of the hydraulic tool.

The present invention attempts to eliminate the above-mentioned drawbacks of conventional hydraulic tools, and is characterized by eliminating the pilot hydraulic pump and combining its functions with the tool drive pump. It is something.

An example will be described below with reference to the drawings. Engine E has a high pressure pump HP and a low pressure pump LP
are rotated at the same time to send out oil. Normally, as shown in Figure 1, the solenoid valve 1 is in the intermediate position, and the low pressure pump
A portion of the oil discharged from the LP is discharged through the solenoid valve 1. The other side of the oil from the low pressure pump is the high pressure pump
The oil from the high pressure pump is discharged through the discharge valve 2 and the solenoid valve 1. Therefore, the compression head H does not operate in this state.

When the solenoid 1a of the solenoid valve 1 is energized, the solenoid valve switches to the first position, and as shown in FIG. It is sent to the head H via the valve 2, causing the ram H1 to move rapidly and temporarily compressing the sleeve S. The remaining oil discharged from the low pressure pump LP is sucked into the high pressure pump HP and discharged from the high pressure pump HP, but at a predetermined pressure it passes through the discharge valve and is drained from the relief valve 3.
is maintained in the sleeve S in a temporarily compressed state.

Next, when the solenoid 1b of the solenoid valve 1 is energized, the solenoid valve switches to the second position as shown in FIG. Come on, close this. Some of the oil discharged from the low-pressure pump is transferred to the high-pressure pump.
The amount that cannot be sucked into the HP is drained from the relief valve 4. The set pressure of this relief valve 4 is set larger than the set pressure of the relief valve 3. The oil discharged from the high pressure pump HP is sent to the head H and presses the sleeve S at high pressure (approximately 700
Kg/cm ² ) and connect to the distribution line. Thereafter, the high pressure relief valve 5 is opened to provide relief.

When the solenoid valve 1 is de-energized, the solenoid valve returns to the intermediate position, and the oil in the head H is discharged to the discharge valve 2.
Then, the oil is drained through the solenoid valve 1, and the ram H1 returns to its original state.

The present invention is constructed as described above. On the other hand, the conventional one requires a pilot pump PP, a check valve 10, a relief valve 11, and a discharge valve 12 in addition to the components of the present invention, as shown in FIG. The additional components were heavy. This invention is a high pressure pump
HP and low pressure pump LP are connected in series, high pressure pump HP is connected to head H, and low pressure pump LP is connected to head H via solenoid valve 1 and discharge valve 2. ,
This allows the number of parts to be reduced and the overall weight to be reduced without impairing the functions of fast forwarding and two-stage compression.

[Brief explanation of drawings]

Figures 1 to 3 are hydraulic circuit diagrams of the present invention;
The figure is a hydraulic circuit diagram of a conventional example. 1...Solenoid valve, 1a, 1b...Solenoid, 2
... Discharge valve, 3 ... Relief valve,
4... Relief valve, 5... High pressure relief valve, E...
...Engine, HP...High pressure pump, LP...Low pressure pump, H...Head, H1...Ram.

Claims (1)

[Scope of utility model registration request] It has two pumps, one for low pressure and one for high pressure, which operate simultaneously.The discharge valve is opened at the first position of the solenoid valve, and the discharged oil from the high pressure pump is drained through the discharge valve, and the discharge oil is discharged from the low pressure pump. The ram in the compression head is quickly moved using hydraulic pressure from the pump to temporarily compress the compressed object and maintain a constant pressure, then the discharge valve is closed at the second position of the solenoid valve and the ram is sent to high pressure using hydraulic pressure from the high pressure pump. In a hydraulic tool for crushing an object to be compressed, the two pumps are connected in series, the high pressure pump is connected to the compression head, and the low pressure pump is connected to the high pressure pump and compression via a solenoid valve and a discharge valve. 1. A hydraulic tool for compression connection of a power distribution line, characterized in that the discharge valve is connected between heads and can be closed by hydraulic pressure from a low-pressure pump flowing in through a solenoid valve in a second position.