JPH0115504Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is used, for example, in woodworking machines such as mortise machines and corner grinders to clamp workpieces, etc. This invention relates to a hydraulically operated vise device in which the two are moved relative to each other.

(Prior Art) Conventionally, a hydraulically operated vise device has a configuration as shown in FIG. 8 and FIG. 9, which shows a cross section taken along line CC in FIG. That is, the vice stand 51 has a guide shaft 5 movably holding a vice 52 for clamping the workpiece A.
3 is supported via a guide shaft holder 54, a left-hand thread is machined at one end, a right-hand thread is machined at the other end, and a male thread 56 that engages with a female thread 55 connects a bush 57 as a radial bearing and a thrust bearing. 58.

The male thread 56 has a chain coupling 6 which is prevented from rotating at one end by a key 59.
Hydraulic motor 62 mounted on motor flange 61 for rotating external thread 56 by 0
is connected to the output shaft of

In this configured state, when the hydraulic motor 62 that receives hydraulic pressure in the clamping direction is driven, the male thread 56 rotates and the female thread 55
By screwing with the guide shaft 5, the vise 52
3, moves in the direction to clamp the workpiece A. Furthermore, the workpiece A is unclamped by reversing the drive rotation direction of the hydraulic motor 62.

However, as shown in FIGS. 8 and 9, the conventional vise device has a large number of parts, a complicated mechanism, and an expensive hydraulic motor 62, resulting in high costs. Since there are many moving parts, there was a problem of poor durability. Furthermore, if the hydraulic pressure supplied to the hydraulic motor 62 is increased to increase the clamping speed, the workpiece A will be tightened with a torque exceeding the capacity of the hydraulic motor 62 due to the moment of inertia of the screw, coupling, and hydraulic motor.
There was a problem in that the threaded structure became too tight, making it difficult to release the clamp.

(Problems to be Solved by the Invention) Therefore, in order to solve the above problems, the present invention has developed a vise system without using screws, couplings, hydraulic motors, etc. as in the conventional vise devices. The technical problem to be solved is to obtain a centripetal effect by transmitting the movement of oil in the cylinder to the ram using a simple configuration in which the guide shaft itself is a ram.

(Means for Solving the Problems) The technical means for solving the above problems consists of a plurality of rams in which one side of the vise is fixed and the other is slidably supported, and the ends of the rams are supported and This is a vice device equipped with a cylinder provided with a hydraulic chamber for reciprocating a ram in the axial direction by receiving pressure oil from a hydraulic source.

(Function) Next, in order to specifically explain the function of the present invention, as shown in FIG. 1, a hydraulic circuit is configured externally, and the cylinder configuration of the vice device of the present invention is specifically shown.

The hydraulic passage of the main switching valve V1 supplies pressure oil from the hydraulic source S to the hydraulic chamber C through the port P1 of the cylinder 2a.
1, vice 1a
The ram 3a with the ram 3a fixed thereon is pressed and moved in the direction of the hydraulic chamber C2, and the oil remaining in the hydraulic chamber C2 of the cylinder 2b is forced out from the port P2 in accordance with the amount of movement of the ram 3a. The hydraulic passage of the home return switching valve V2 is
If the pressure oil pumped out from port P2 is switched to bypass port P3, hydraulic pressure chamber C
The oil pressurized from the hydraulic chamber C4 is supplied to the hydraulic chamber C3, and the ram 3b with the vice 1b fixed thereto is moved in the direction of the hydraulic chamber C4, and the oil remaining in the hydraulic chamber C4 is moved according to the amount of movement of the ram 3b. and returns to tank T from port P4 through main switching valve V1. As a result, vice 1a and vice 1b move in the centripetal direction.

On the other hand, when vice 1a and vice 1b are to be moved in the non-clamping direction, that is, when returning to the origin, the hydraulic passage of the main switching valve V1 is switched to the opposite direction to that during clamping, and the hydraulic passage of the origin return switching valve V2 is
Pressure oil from the hydraulic source S is applied to the port P of the cylinder 2b.
2 to the hydraulic chamber C2, and the oil remaining in the hydraulic chamber C3 is switched so that it returns to the tank T through the main switching valve V1. In this state, when pressure oil from the hydraulic source S is supplied to the port P4 of the cylinder 2a, the ram 3b moves into the hydraulic chamber C3.
The oil that was pushed out in the direction of
Return to Tank T through . Furthermore, the pressure oil from the hydraulic source S is also supplied to the hydraulic chamber C2 of the cylinder 2b through the main switching valve V1 and the home return switching valve V2, so the ram 3a is pushed out in the direction of the hydraulic chamber C1. The oil remaining in the hydraulic chamber C1 returns to the tank T via the main switching valve V1. By thus moving the ram 3a in the direction of the hydraulic chamber C1 and the ram 3b in the direction of the hydraulic chamber C3, the vices 1a and 1b return to their original positions.

(Example) Next, the configuration of an example of the present invention is shown in Figures 2 to 4.
As shown in the figure. FIG. 2 is a plan view of a vise device according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3.

In FIG. 2, a cylinder 12a and a cylinder 12b are fixed on a vice stand 11, a vice 13a is fixed with a bolt 15, and a vice 13b is fixed on a vice stand 11.
The ram 14a that slidably supported the ram 14a and the vise 13
A ram 14b, which is fixed with a bolt 15 and slidably supports a vise 13a, is supported by the cylinders 12a and 12b.

FIG. 3 shows a cross section taken along the line AA in FIG. 2, and the ram 14b slidably holds the vice 13a via the bush 16. Similarly, ram 1
The ram 14a having the same diameter as the bush 16
This shows that the vise 13b is slidably held via the . Further, the cylinder 12a and
The cylinder 12b includes a gasket 17 to prevent oil from leaking from the gaps between the rams 14a and 14b, and a scraper 18 to protect the gasket 17 by removing foreign matter adhering to the rams 14a and 14b. Installed.

FIG. 4 shows a BB cross section in FIG. 3, and the cylinder 12a is equipped with a port P1 and a port P4 that serve as pressure oil supply and discharge ports, and further has a hydraulic chamber C1 connected to the port P1. A hydraulic chamber C4 is provided which is connected to the port P4. On the other hand, the cylinder 12b includes a port P2 and a port P3, and is further provided with a hydraulic chamber C2 connected to the port P2 and a hydraulic chamber C3 connected to the port P3.

In the above configuration, a hydraulic circuit as shown in FIG. 5 is formed and the operation when operating the vice device of this embodiment will be explained in principle.

As shown in FIG. 5, the pressure oil from the hydraulic source S is
The solenoid SOL1 of the main switching valve V1 is energized so that it is supplied to the hydraulic chamber C1 of the cylinder 12a through the main switching valve V1. As a result, pressure oil from the hydraulic source S is supplied from the port P1 to the hydraulic chamber C1 of the cylinder 12a via the main switching valve V1, and pushes out the ram 14a. When the ram 14a is pushed out, oil in the hydraulic chamber C2 on the opposite side to the hydraulic chamber C1 enters the hydraulic chamber C3 through the port P2, the piping, and the port P3, and pushes out the ram 14b. Since the rams 14a and 14b have the same diameter and the same pressure receiving area, the ram 14b moves in the opposite direction to the ram 14a by a distance equal to the distance moved by the ram 14a. As the ram 14b moves in the opposite direction to the ram 14a, the oil in the hydraulic chamber C4 is transferred to the main switching valve V1 by an amount corresponding to the amount of movement of the ram 14b.
Return to Tank T through . Therefore, the vice 13a fixed to the ram 14a and the vice 13b fixed to the ram 14b approach each other by the same distance.

Next, when the vise 13a and the vise 13b are to be returned to the unclamping direction, that is, to the origin direction, the solenoid SOL1 of the main switching valve V1 is de-energized and communicated with the solenoid SOL2.
As a result, pressure oil from the hydraulic source S is supplied to the hydraulic chamber C4 from the port P4 and pushes the ram 14b. When the ram 14b is pushed, the oil in the hydraulic chamber C3 enters the hydraulic chamber C2 from port P3 through the piping and port P2, and as a result of pushing the ram 14a, the oil in the hydraulic chamber C
1 returns to tank T from port P1 through main switching valve V1. Therefore, the vice 13a fixed to the ram 14a and the vice 13b fixed to the ram 14b move away from each other by the same distance.

The hydraulic circuit configured as shown in FIG.
If the gasket 17 provided between the cylinder 12b and the rams 14a, 14b leaks to the outside even a little bit, the relative position of the rams 14a and 14b will gradually change and the error will become larger as the rams 14a and 14b operate repeatedly. There is a problem with getting used to it.

Therefore, as a means to solve the above-mentioned problems, the present invention comprises a hydraulic circuit shown in FIG. 6 and a solenoid valve control circuit shown in FIG. By feeding and pushing the rams 14a and 14b back to their origin,
This prevents cumulative errors in relative position due to repeated operations.

In other words, the clamp switch PB shown in FIG.
By pressing 1, the solenoid SOL1 of the main switching valve V1 and the solenoid SOL1 of the home return switching valve V2 are activated.
Make SOL3 energized. As a result, the hydraulic source S
The pressure oil supplied from the main switching valve V1 enters the hydraulic chamber C1 from port P1 and pushes the ram 14a, and the oil in the hydraulic chamber C2 bypasses port P2 and passes through the home return switching valve V2 to port P3. and enters the hydraulic chamber C3. Therefore, ram 14b is ram 1
4a, the oil in the hydraulic chamber C4 returns to the tank T through the port P4 and the main switching valve V1. Therefore, vice 13a and vice 1
3b approach each other by equal distances in the clamping direction.

Next, when unclamping the vices 13a and 13b, by pressing the unclamp switch PB2 shown in FIG. 7, the solenoid SOL1 of the main switching valve V1 and the solenoid SOL3 of the home return switching valve V2 are de-energizes, and energizes solenoid SOL2 of main switching valve V1 and solenoid SOL4 of home return switching valve V2. As a result, the pressure oil supplied from the hydraulic line S passes through the main switching valve V1 and enters the hydraulic chamber C4 from the port P4, pushing the ram 14b toward the hydraulic chamber C3, and the oil in the hydraulic chamber C3 returns to the origin. It returns to the tank T through the return switching valve V2 and the main switching valve V1.

On the other hand, the pressure oil from the hydraulic source S that has passed through the main switching valve V1 is also supplied to the hydraulic chamber C2 from the port P2 through the origin return switching valve V2. As a result, ram 1
4a is pushed toward the hydraulic chamber C1, and the oil in the hydraulic chamber C1 is pushed out from the port P1 and returns to the tank T through the main switching valve V1. In this way, the ram 14a
Then, the ram 14b returns to its original position in the unclamping direction, and the vise 13a and vice 13b return to their original positions.

By unclamping in this way, the vise 13a and the
Since the vise 13b is returned to its original position, it is possible to eliminate the cumulative positional error caused by the oil leakage. (Effects of the invention) As described above, the present invention has a simple structure and is inexpensive, without using a high-pressure hydraulic motor or mechanically movable parts such as screws or coupling rings, unlike the conventional methods. This has the effect of providing an effective vise device.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operation of the present invention, Fig. 2 is a plan view of a vice device according to an embodiment of the present invention, and Fig. 3 is a diagram illustrating the operation of the present invention.
4 is a sectional view taken along line BB in FIG. 3, FIG. 5 is a principle diagram of a hydraulic circuit according to an embodiment of the present invention, FIG. 6 is a hydraulic circuit diagram thereof, and FIG. indicates its control circuit. Furthermore, FIGS. 8 and 9 are cross-sectional views showing the structure of a conventional vice device. 11...Vise stand, 12a, 12b...Cylinder, 13a, 13b...Vise, 14a, 14b
...Ram, V1...Main switching valve, V2...Home return switching valve, C1, C2, C3, C4...Hydraulic chamber, P
1, P2, P3, P4...port, S...hydraulic source, T...tank.

Claims (1)

[Claims for Utility Model Registration] A first ram and a second ram are provided in parallel, one of the opposing vises is fixed, and the other vice is slidably supported, and the first ram and the second ram are provided in parallel. 2
rams are configured to be driven in the axial direction by hydraulic cylinders provided at both ends of each ram,
A vice device configured to move opposing vices in a clamping direction and in a return-to-origin direction opposite to the same direction, wherein a first , and a second ram is formed into first, second, third, and fourth hydraulic chambers through which the second rams are movably inserted in the axial direction, and when the opposing vise is moved in the clamping direction, pressure is supplied from the hydraulic source. A first hydraulic chamber to which oil is supplied and a fourth hydraulic chamber to which the same amount of oil as the pressure oil supplied from the hydraulic source is discharged to the outside are located at the same end of the first and second rams. and a second hydraulic chamber is provided on the opposite side of the first hydraulic chamber across the first ram,
On the opposite side of the fourth hydraulic chamber via the second ram is the third hydraulic chamber.
Further, when moving the opposing vise in the clamping direction, the second hydraulic chamber and the third hydraulic chamber are provided.
A vice device characterized in that it is provided with communication means for communicating with the second hydraulic chamber and sending oil retained in the second hydraulic chamber to the third hydraulic chamber.