JPH02874Y2 - - Google Patents

Description

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

(Prior Art) In a conventional so-called double-acting compression device in which the reciprocating motion of the ram is performed using hydraulic pressure, the two-stage operation of preliminary compression and main compression cannot be performed using hydraulic pressure.

(Problems to be solved by the invention) This invention aims to solve the above-mentioned problems of the conventional double-acting hydraulic compression device and provide a two-stage compression type hydraulic compression device that is simple in structure and easy to manufacture. It is something to do.

(Means for solving the problem) In this invention, in order to solve the above problem, the valve chamber 9b of the control valve 9 and the pilot pump P ₂
The valve chamber 9b also communicates with the oil tank T through a normally open first diaphragm valve 10 connected to the balloon B to control the control valve 9 using air pressure. In addition, a temporary compression relief valve 13 that opens at a relatively low pressure required for temporary compression and a high pressure safety valve 15 that opens at a high pressure required for main compression are connected to the cylinder 1, respectively, and the valve B and First diaphragm valve 10
An air valve 21 is interposed between the balloon B and the second diaphragm valve 12 to open the air passage to the outside air in conjunction with the opening operation of the high-pressure safety valve 15. Compression relief valve 1
An on-off valve 22 for main compression is provided to disconnect from the main compression valve 3.

(Function) When the pumps P ₁ and P ₂ are driven by the drive source and the balloon B is compressed, the first diaphragm valve 10 is closed and oil enters the valve chamber 9b from the pump P ₂ and the control valve 9
Switch to compression mode. The oil from the pump _P1 is sent to the cylinder 1, and the ram 3 performs a compression operation. On the other hand, since the second diaphragm valve 12 is open, when the oil pressure reaches a predetermined pressure, the temporary compression relief 13 opens, the oil is drained through the second diaphragm valve 12, and the temporary compression is completed. When the main compression switching valve 22 is opened in this state, the air pressure against the second diaphragm valve 12 decreases and it closes. Therefore, if the pump _P1 is continued to rotate, the oil pressure inside the cylinder 1 will increase, and main compression will be performed until the high pressure safety valve 15 opens. When the high pressure safety valve 15 opens, the air valve 21 opens in conjunction with this, the air pressure against the first diaphragm valve 10 decreases, this opens, oil is drained, the control valve 9 returns, and the ram 3 also returns.

(Example) 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. A fixed die _D2 is attached to the hook ₂ so as to face the movable die D1. A small cylinder 4 is formed in the ram 3, and a fixed piston 5 erected in the center of the cylinder 1 is fitted into the small cylinder 4 so as to be relatively slidable therein. A ram 3 is mounted on the lower side of the piston rod 6 of the fixed piston 5.
In the state shown in FIG. 1 in which the small cylinder 4 and the cylinder 1 are at the bottom dead center, an oil passage 7 is formed that communicates the small cylinder 4 with the cylinder 1. In addition, the small cylinder 4 has a piston rod 6.
It communicates with the outside via an oil passage 8 that passes through the inside in the axial direction.

Thus, the cylinder 1 communicates with the pump P ₁ via the 2-position, 4-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 of the pumps _P1
and the other is connected to the oil drainage 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. The first diaphragm valve 10 has a lever 10b that fixes its valve stem 10a in an open position. The valve chamber 9b is also 20Kg/cm ²
It communicates with the oil tank T via a pilot relief valve 11 which operates at .

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 is discharged to the oil tank T via the control valve 9. be done.
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 operating button 22a is pressed to open the on-off valve 22 and the air is exhausted, 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.
When the opening/closing valve 20 for halfway return is opened, the air pressure to the first diaphragm valve 10 is cut off, which opens and the control valve 9 is returned to its original position 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. is restored by the reaction force of spring 9c. The oil from the pump _P1 enters the small cylinder 4 through the control valve 9 and the oil passage 8 of the piston rod 6, and pushes down the ram 3. Therefore, even if the die D ₁ is caught in the compressed object at this time, the ram 3 is forcibly returned by the hydraulic pressure of up to 100 kg/cm ² from the low pressure safety valve 16, so that 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. dice
When D ₁ reaches the bottom dead center, as shown in Fig. 1, small cylinder 4 and cylinder 1 are communicated through oil passage 7, and the oil sent to small cylinder 4 is sent to oil passage 7, cylinder 1, and control valve. It is discharged after 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.

(Effects of the invention) Since this invention has the configuration described above, it is possible to provide a two-stage compression type hydraulic compression device that is simple in structure and easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a front view of the compression device in an idling state, FIG. 2 is a front view of the compression device in a temporary compression state, FIG. 3 is a front view of the compression device in a fully compressed state, and FIG. 4 is a front view of the compression device in a restored state. 1... Cylinder, 3... Ram, 9... Control valve,
9b... Valve chamber, 10... First diaphragm valve, 1
2... Second diaphragm valve, 13... Temporary compression relief valve, 15... High pressure safety valve, 21... Air valve,
22...Opening/closing valve, _P1 ...Pump, _P2 ...Pilot pump, B...Balloon.

Claims (1)

[Scope of utility model registration request] In a hydraulic compression device in which a control valve selectively switches an oil passage from a pump to a cylinder to compress or restore a ram, the control valve communicates the valve chamber of the control valve with a pilot pump and uses hydraulic pressure to operate the control valve. The valve chamber also communicates with the oil tank through a normally open first diaphragm valve connected to the balloon, so that the control valve is controlled by air pressure, and the cylinder has a relatively A temporary compression relief valve that opens at low pressure and a high-pressure safety valve that opens at high pressure required for main compression are connected, and a valve is connected between the balloon and the first diaphragm valve in conjunction with the opening operation of the high-pressure safety valve. Hydraulic compression with an air valve that opens the air passage to the outside air, and an on-off valve for main compression that disconnects the cylinder and temporary compression relief valve when the circuit is closed between the balloon and the second diaphragm valve. Device.