JPH02875Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a hydraulic compressor used for compressing and connecting electric wires, etc.

(Prior art) Conventionally, for example, as shown in Japanese Patent Publication No. 58-28074,
A hydraulic compressor is known that uses a spring force to return a ram holding a movable die to its original position.

(Problem to be solved by the invention) In the conventional device described above, if the movable die gets caught in an object to be compressed, such as an aluminum sleeve for connecting electric wires, the ram cannot be returned to its original position using only the spring force. It may disappear. This invention attempts to solve the above-mentioned conventional problems.

(Means for Solving the Problems) In order to solve the above problems, this invention has a fixed piston 5 installed in the cylinder 1 connected to the pump P ₁ via the control valve 9. A small cylinder 4 is provided on the ram 3 to be fitted, a fixed piston 5 is inserted into the small cylinder 4, and a piston rod 6 of the fixed piston 5 communicates the small cylinder 4 with the cylinder 1 at the bottom dead center of the ram 3. Oil passage 7
and small cylinder 4 and pump P ₁ via control valve 9.
An oil passage 8 is provided to communicate with the cylinder 1, and oil from the pump _P1 is selectively supplied to the cylinder 1 by the operation of the control valve 9.
Alternatively, it is sent to the small cylinder 4, and the compression or return operation is performed by hydraulic pressure.

(Operation) When oil is sent from the pump _P1 to the cylinder 1 via the control valve 9, the ram 3 rises and performs a compression operation.
When the control valve 9 is switched and oil is sent from the pump P ₁ to the small cylinder 4 via the piston rod 6, the ram 3 returns, and after returning, the small cylinder 4 communicates with the cylinder 1 via the oil passage 7. , oil is discharged from cylinder 1, so an idling state is obtained.

(Embodiment) A hook 2 is fixed to the cylinder 1. A ram 3 is fitted into the cylinder 1 so as to be movable up and down, and a movable die _D1 is attached to the upper part of the ram 3. It is assumed that a fixed die _D2 is attached to the hook ₂ so as to face the movable die D1. Ram 3
A small cylinder 4 is formed in the
A fixed piston 5 erected in the center of the cylinder 1 is fitted within the cylinder 1 so as to be relatively slidable therein. A small cylinder 4 is attached to the lower side of the piston rod 6 of the fixed piston 5 when the ram 3 is at the bottom dead center in the state shown in FIG.
An oil passage 7 is formed which communicates the cylinder 1 with the cylinder 1 . Further, the small cylinder 4 communicates with the outside via an oil passage 8 that axially passes through the inside of the piston rod 6.

Thus, the cylinder 1 communicates with the pump P ₁ via the two-position, four-way control valve 9, and the oil passage 8 leading to the small cylinder 4 also communicates with the pump P ₁ via the control valve 9. Depending on the position of the valve body 9a of the control valve 9, either one is connected to the pump _P1 and the other is connected to the oil drain path.

The pilot pump _P2 is connected to the pump _P1 and the control valve chamber 9b, and performs rapid feed when the ram rises.
It is also assumed that the control valve 9 is operated by sending oil to the valve chamber 9b. The pilot pump _P2 and the valve chamber 9b communicate with the oil tank T via a normally open first diaphragm valve 10. diaphragm valve 10
has a lever 10b that fixes its valve stem 10a in the open position. The valve chamber 9b also communicates with the oil tank T via a pilot relief valve 11 operating at 20 kg/cm ² .

The pump P ₁ and the control valve 9 communicate with the oil tank T through a normally closed second diaphragm valve 12 and a temporary compression relief valve 13 that operates at 8 kg/cm ² . The second diaphragm valve 12 has its valve stem 12
It has a lever 12b that fixes the circuit a in the closed circuit position.

The cylinder 1 and the control valve 9 communicate with the oil tank T via the high pressure safety valve 15 that operates at 720 kg/cm ² , and the small cylinder 4 and the control valve 9 communicate with
It communicates with the oil tank T via a low pressure safety valve 16 that operates at 100 kg/cm ² .

Next, the pneumatic circuit will be explained. One side from the balloon B is connected to the first diaphragm valve 1 via the check valves 17 and 18.
0, and the other is connected to the second diaphragm valve 12 via check valves 18 and 19.

Interposed between the check valve 17 and the first diaphragm valve 10 are an on-off valve 20 for halfway return, and an air valve 21 that opens in conjunction with the opening operation of the high-pressure safety valve 15. An on-off valve 22 for main compression is interposed between the check valve 19 and the second diaphragm valve 12.

Next, the operation will be explained. As shown in FIG. 1, with the lever 10b applied to the valve stem 10a of the first diaphragm valve 10 and the first diaphragm valve 10 opened, when the engine E is started and the pumps P ₁ and P ₂ are operated, the pumps From P ₂ , part of the oil is drained via the diaphragm valve 10 into the oil tank T, and the other is sent to the pump P ₁ . From the pump _P1 , oil is sent into the small cylinder 4 through the oil passage 8 of the piston rod 6, from the small cylinder 4 through the oil passage 7 on the side of the piston rod 6, through the bottom gap of the cylinder 1, and then to the outside. and returns to the oil tank T via the control valve 9. This is the idling state.

Next, as shown in FIG. 2, the first diaphragm valve 10
Remove the lever 10b, grasp the balloon B, and
When the diaphragm valve 10 is closed by applying pressure, oil from the pump P ₂ is sent to the control valve chamber 9b, moving the valve body 9a to the right in the drawing, and communicating the pump P ₁ with the cylinder 1. On the other hand, the air pressure in balloon B is
It also applies to the second diaphragm valve 12, which is opened to allow the pump _P1 to communicate with the temporary compression relief valve 13 and the oil tank T. Then, the oil is sent from the pump P ₁ to the cylinder 1, the ram 3 is pushed up, and the oil in the small cylinder 4 passes through the oil passage 8 of the piston rod 6 and goes to the oil tank T via the control valve 9. be discharged.
Pump P ₁ is also connected to temporary compression relief valve 13, which opens and drains at 8 kg/cm ² . In this state, an aluminum sleeve with a C-shaped cross section (not shown) is held between the dies D ₁ and D ₂ together with one of the connecting wires, and the aluminum sleeve is hooked onto the other existing wire.

Next, as shown in FIG. 3, when the operation button 22a is pressed to open the on-off valve 22 and exhaust air, the second diaphragm valve 12 closes and the temporary compression relief valve 13 and pump
Since P ₁ is disconnected, the oil pressure inside the cylinder 1 is increased and the main compression is completed. If you want to return the ram 3 during the main compression operation, press the operation button 20a.
If you push in and open the halfway return on/off valve 20, the first
Air pressure is cut off to the diaphragm valve 10, which opens and the control valve 9 is returned to its original state by the spring 9c, returning to the state shown in FIG.

When the main compression is completed, as shown in FIG. 4, the high pressure safety valve 15 opens, and its valve stem 15a opens the air valve 21, cutting off the air pressure to the first diaphragm valve 10, which opens the control valve 9. will return. The oil from the pump _P1 enters the small cylinder 4 via the control valve 9 and the oil passage 8 of the piston rod 6.
Push down ram 3. Therefore, at this time, dice D ₁
Even if the material is caught in the compressed object, the low pressure safety valve 16
Since the ram 3 is forcibly returned by hydraulic pressure of up to 100 kg/cm ² , it can be easily removed. When the ram 3 descends, the oil in the cylinder 1 is pushed out and discharged into the oil tank T via the control valve 9. When the die D ₁ reaches the bottom dead center, as shown in Fig. 1, the small cylinder 4 and cylinder 1 are communicated through the oil passage 7, and the oil sent to the small cylinder 4 is sent to the oil passage 7, cylinder 1, and control. It is discharged via valve 9.

As shown in FIG. 1, if the lever 12b of the second diaphragm valve 12 is placed on the valve stem 12a so as not to operate, the temporary compression operation can be eliminated and only the main compression operation can be performed.

It should be noted that the present invention is not limited to the illustrated embodiment, and, for example, the specific configuration of the hydraulic circuit may be used.

(Effect of the invention) In this invention, the return operation of the ram 3 is performed by hydraulic pressure, so even if the die D ₁ gets stuck in the object to be compressed, it can be easily released and the work can be carried out smoothly. A fixed piston 5 is installed in the ram 3, a small cylinder 4 is provided in the ram 3 that fits into the small cylinder 4, the fixed piston 5 is inserted into the small cylinder 4, and the piston rod 6 of the fixed piston has a lower dead end Since the oil passage 7 communicating between the small cylinder 4 and the cylinder 1 is provided at the point, a simple and compact compressor is obtained in which both the reciprocating motion of the ram can be performed by hydraulic pressure.

[Brief explanation of the drawing]

Figure 1 is a front view of the compressor in an idling state.
FIG. 2 is a front view of the same in a temporarily compressed state, FIG. 3 is a front view of the same in a fully compressed state, and FIG. 4 is a front view of the same in a restored state. 1... Cylinder, 3... Ram, 4... Small cylinder, 5... Fixed piston, 6... Piston rod, 7
...Oil passage, 8...Oil passage, 9...Control valve, P ₁
……pump.

Claims (1)

[Scope of utility model registration request] A fixed piston is installed in a cylinder connected to a pump via a control valve, a small cylinder is provided on a ram that fits into this cylinder, the fixed piston is inserted into this small cylinder, and a ram is attached to a piston rod of the fixed piston. An oil passage that communicates between the small cylinder and the cylinder at the bottom dead center of the cylinder, and an oil passage that communicates the small cylinder and the pump via a control valve are provided, and the control valve selectively directs oil from the pump to the cylinder or A hydraulic compressor that sends data to small cylinders and performs compression or return operations, respectively.