JPS64190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combination of a hydraulic drive unit and a dedicated hydraulic tool connected to the unit and operated by hydraulic pressure from the unit. It is equipped with a special function that performs the temporary holding of the crimping material between the dies, the start of crimping, crimping, the end of crimping, and the partial return of the crimping material using hydraulic pressure.On the other hand, a dedicated drive is specially devised to accomplish this function. The purpose is to provide a unit and use the two inseparably to fulfill the functions of the tool.

The details of the embodiment will be described below with reference to the drawings.

Schematically, as shown in Fig. 1, the hydraulic drive unit 5
0 and a hydraulic pressure bonding tool 60 connected to this via a hose.

First, the hydraulic drive unit 50 is constructed as shown in FIG. That is, 20 is a hydraulic motor, and the motor 20 has a port 21 connected to a low hydraulic pressure source P.
and a port 22 connected to the oil tank T.

A base body 2 that is long in the axial direction is provided on one end surface of the motor 20.
A rotating shaft 24 of the motor 20 is supported within the base body 23, and a swash plate cam 25 is provided at the end of the rotating shaft 24.

On the surface of the swash plate cam 25, a plunger 2 constituting a high pressure generation pump is provided in the axial direction of the base body 23.
A cylinder 28, into which one end of 6, 27 is slidably connected, and which inserts and supports the plungers 26, 27;
29 is a branch path 3 of an oil feed path 30 that connects to the motor 20.
1 and 32, and a discharge valve 33 is provided between one branch passage 31 and the corresponding cylinder 28, and a suction valve 33' is provided between the other branch passage 32 and the corresponding cylinder 29. are interposed, and the branch passage 31 where the discharge valve 33 is located is communicated with the port 34 for connection to the tool. A valve 35 that cuts off communication between the other branch path 32 is interposed, and this valve 35 and the port 34
A trochoid is constructed of a runner 37 fixed to the shaft 24 around the rotating shaft 24, and a stator 38 surrounding the runner 37. A pump 39 is provided, and the suction side 40 of the pump 39 is connected to the other end of a passage 42 whose one end communicates with another port 41 for connecting a tool.
A drive unit 50 is constructed by communicating the discharge side 43 of the oil return passage 44 of the motor 20 with the oil return path 44 of the motor 20. Note that the relief valve 36 is communicated with a negative pressure passage 42.

The branch passages 31 and 32 are communicated with double inner and outer grooves 46 and 47 provided in the base body, as shown in FIG. That is, in this example, the branch passage 31 (discharge side) communicates with the outer groove 47, and the branch passage 32 (suction side) communicates with the inner groove 46, and in this example, the branch passage 3
1 and 32 are provided at four equally divided locations, making these two a pair.

Next, the hydraulic tool 60 will be described.

This tool 60 consists of a base body 1 which also serves as a handle, and a head part 2. A hydraulic control circuit, which will be described later, is formed in the base body 1, and a cylinder 3 connected to the hydraulic control circuit is formed in the head part 2. A ram 4 is inserted into the cylinder 3 while being constantly urged back by a spring 5, and a crimping die 7 is inserted into the ram 4.
A cutter (in some cases, a cutter) is attached, and this die 7 is opposed to a die 8 fixed to the head.

The hydraulic control circuit is provided with an input passage 9 in the base body 1, which has an input end A connected to the port 34 of the unit 50 and whose other end output end B communicates with the cylinder 3. In this case, one end of the main relief passage 10 is communicated via a first control valve 11 so as to be openable and closable. The other end C of this main relief passage 10 is connected to the other return port 41 of the unit 50. Note that the connection means is a hose or the like.

The first control valve 11 is always urged by a spring 12 to open the main relief passage 10, and when the first control valve 11 is pushed down from the outside, the valve seat 10' of the main relief passage 10 is closed. It's summery.
Furthermore, the input passage 9 includes the main relief passage 10.
One end of a sub-relief passage 13 in a separate system is communicated via a second control valve 14 so as to be openable and closable.

The second control valve 14 is always urged by a spring 15 to close the valve seat 13' of the sub-relief passage 13, and opens the sub-relief passage 13 when pressed down from the outside.

Furthermore, the other end of the auxiliary relief passage 13 is openably and closably connected to the main relief passage 10 via a third control valve 16, which is always biased by a spring 17 to close the auxiliary relief passage 13. It is designed to open under a certain internal pressure, which will be described later.

In this example, as a means for operating the first control valve 11 and the second control valve 14 from the outside, the first control valve 11 is integrally formed with a valve stem 11' which protrudes outside the base body. A separate valve stem 14' with a part protruding outside is faced to the two control valves 14, and both valve stems 1
Levers 18 and 19 provided on the base body are brought into contact with levers 1' and 14', respectively, so that they can be pressed down.

The operation will be described below.

First, the operation of the hydraulic drive unit 50 is as shown in FIG. 2. The motor 20 is driven by the inflow of low pressure oil from the hydraulic source P, the swash plate cam 25 rotates together with the rotating shaft 24, and the plunger 27 performs a suction operation and the plunger 2
6 is performed and the oil is sent into the tool 60 through the port 34, but when the tool has not yet crimped the material, that is, in the free state described later, the oil that exits the port 34 is sent to the tool 60 and the unit 50.
It simply circulates through the return port 41, passage 42, pump 39, and oil tank T. In other words, the oil flow condition shown in FIG. 1 is maintained.

Further, when the material is crimped by the tool 60 and the internal pressure of the branch passage 31 on the high pressure side rises, the valve 35 closes and the communication between the branch passage 32 on the suction side and the branch passage 31 on the discharge side is cut off. The oil sucked in by the side plunger 27 is compressed and pressurized exclusively by the discharge side plunger 26, and is sent to the tool through the branch passage 31 and the port 34, and crimping is performed.

When the crimping is completed and the internal pressure of the branch passage 31 rises accordingly, the relief valve 36 opens as shown in FIG. 5, and the pressure of the branch passage 32 is released to the passage 42.

Based on the operation of the drive unit described above, the operation of the crimping tool will be described below.

Free state (Fig. 8) Oil from the port 34 of the drive unit described above flows into the input passage 9 from the input end A side to the output end B side, and although the ram 4 of the cylinder 3 attempts to advance, the first Since the control valve 11 opens the main relief passage 10, most of the oil in the input passage 9 flows into the main relief passage 10, so that no hydraulic pressure is applied to the cylinder and therefore the ram 4 is not operated. Also, the oil from the main relief passage 10 flows into the port 41 of the drive unit, and is returned to the oil tank T through the negative pressure passage 42 and the pump 39.

Temporary holding (Fig. 9) When the material is interposed between the dies 7 and 8 and the valve stems 11' and 14' are pushed together in this state, the first control valve 11 is moved to the main relief passage by the valve stem 11'. 10 is closed, and the second control valve 14 opens the secondary relief passage 13 by means of the valve stem 14', but the third control valve 16 is closed, so that the hydraulic pressure in the input passage 9 is reduced to the cylinder 3.
, and the ram 4 moves forward.

And die 7 whose material is ram 4 and fixed die 8
When the ram 4 encounters resistance, the internal pressure in the input passage 9 rises naturally, and when it reaches a certain set value, the third control valve 16 of the auxiliary relief passage 13, which has been closed until now, closes.
operates to convert the sub relief passage 13 into the main relief passage 1.
Therefore, a part of the hydraulic pressure is released to the port 41 of the drive unit 50 through the main relief passage 10, and as a result, the force of the ram 4 to press the material is weak, that is, temporary pressing is performed. Become.

The set pressure of the third control valve 16 is determined by dividing the repulsive force of the spring 17 by the cross-sectional area of the valve seat, and is set to operate at 32 kg/cm ² in this example.

Start of crimping (Fig. 10) With the above-mentioned temporary press (Fig. 9), only the valve stem 14' is released, and the secondary relief passage 13 is opened by the second control valve 14.
When closed, all hydraulic pressure acts on cylinder 3,
The ram 4 is pushed out strongly and begins to press the material. This crimping operation is the state in which the valve 35 of the drive unit described above is closed.

On the other hand, the first control valve 11 is pushed by the valve rod 11' until the set pressure is reached. Note that the first control valve 11
The set pressure is set by the repulsive force of the spring 12 / the cross-sectional area of the valve seat - the cross-sectional area of the valve stem, and when the hydraulic pressure exceeds this set pressure, the first control valve 11 will automatically remain closed without pushing the valve stem 11'. This example is designed so that

Completion of crimping (Fig. 11) When the ram 4 finally finishes crimping and crushing the material from the crimping start state shown in Fig. 10 above, and the internal pressure reaches the set value, the relief valve 36 of the drive unit described above
acts instantly and cuts off the pressure supply to the input passage 9,
As a result, the hydraulic pressure applied to the first control valve 11 momentarily becomes zero, and due to the repulsive force of the spring 12, the first control valve 11
The control valve 11 is opened, and at the same time the oil in the cylinder 3 is returned to the oil tank through the main relief passage 10 and the port 41 of the drive unit by the repulsive force of the return spring 5 of the ram.

Mid-way return (Fig. 12) When it becomes necessary to return the ram 4 in the crimping start state shown in Fig. 5, opening the second control valve 14 causes the input passage 9, the sub-relief passage 13, and the main relief passage 10 to be in communication with each other. In other words, the hydraulic pressure in the circuit is released, and the ram 4 is returned by the force of the spring 5. The first control valve 11 is also opened.

In this example, the force pushing the second control valve 14 is (Valve seat cross-sectional area - valve stem cross-sectional area) ×Hydraulic pressure + repulsive force of spring 15 is set.

As described above, according to the present invention, the crimping tool is configured to automatically perform each operation process of temporarily holding the material between the dies, starting crimping, crimping operation, completing crimping, and returning midway through using hydraulic pressure, A special hydraulic drive unit configured as described above is combined with the function of this tool, and by using this device, it is possible to achieve easier workability and higher efficiency, and its features are great.

[Brief explanation of drawings]

Figure 1 is a front view of the drive unit and tool connected, Figure 2 is a longitudinal sectional front view of the hydraulic drive unit, Figure 3 is a partial end view, and Figures 4 and 5 show the operation. 6 is a partially cutaway front view of the crimping tool, FIG. 7 is a top plan view, and FIGS. 8 to 12 are sectional views of the state.
The figure is a sectional view showing the operating state of the upper hydraulic control circuit.

Claims (1)

[Claims] 1 Hydraulic motor connected to and driven by a low hydraulic power source 2
0 and a base body 23 in the axial direction fixed to one end surface of the motor, and the motor 20 is placed in this base body 23.
A swash plate cam 25 is provided at the end of the rotating shaft 24 of the rotary shaft 24 in parallel, and one end of a plurality of plungers 26, 27 constituting a high pressure generation pump provided in the axial direction of the base body is attached to the swash plate cam 25. Let them slide into contact with each other,
The cylinders 28 and 29 into which the plungers 26 and 27 are inserted and supported are communicated with the branch passages 31 and 32 of the oil feed passage 30 connected to the motor 20, so that oil is discharged between one of the branch passages 31 and the corresponding cylinder 28. and a suction valve 33' is interposed between the other branch passage 32 and the corresponding cylinder 29, and the branch passage 3 where the discharge valve 33 is located
1 is communicated with a port 34 for connection to a tool, and a valve 35 is interposed between the branch passages 31 and 32 to cut off communication between the branch passage 31 and the other branch passage 32 when the internal pressure of one branch passage 31 increases, and The branch passage between this valve 35 and the port 34 is connected to the relief valve 3.
6, and a runner 37 fixed to the rotating shaft 24 around the rotating shaft 24;
A trochoid pump 39 is provided with a stator 38 facing around the trochoidal pump 39.
The suction side 40 of the pump 39 is connected to the other end of a negative pressure passage 42 that communicates with another port 41 for connecting a tool, and the discharge side 43 of the pump 39 is connected to an oil return path 44 of the motor 20.
a hydraulic drive unit 50 in communication with a cylinder 3 having a hydraulic control circuit; a ram 4 inserted into the cylinder 3 and biased back by a spring 5;
The hydraulic control circuit has a die 7 attached to the ram and a fixed die 8 facing the die, and the hydraulic control circuit has one input end A connected to one port 34 of the unit 50. , and an input passage 9 whose other end output end B communicates with the cylinder 3 is provided,
A main relief passage 10, one end of which is connected to the input passage 9 to the other port 41 of the unit 50, is normally biased to open the main relief passage 10 and closed by external operation. The first control valve 11 is opened and closed, and one end of the sub-relief passage 13 is normally biased to be closed and opened by external operation. Further, the other end of the sub-relief passage 13 is normally biased to close the sub-relief passage 13 to the main relief passage 10, and at a constant set pressure. A combination of a hydraulic drive unit and a hydraulic tool, consisting of a hydraulic tool 60 which is opened/closed in communication via a third control valve 16 which is opened.