JPS6039128Y2 - clamp device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a clamp device that is attached to, for example, a bolster or slide of a press machine and fixes a mold to the bolster/slide.

Conventionally, this type of clamp device has a main body that is fixed to a bolster, a slide, etc., and is provided with a swingable tightening fitting for fixing a mold, etc., and presses the rear end of the tightening part of the tightening fitting. There is a clamping device that is equipped with a cylinder, supplies pressure oil to the cylinder, and swings the clamping fitting to tighten the mold.In this clamping device, the force body of the clamping fitting is attached to the take-up part of the mold. Since it remains protruding in the opposite direction, there are problems in that it becomes an obstacle to attaching and removing the mold.

In addition, there is a clamping device that rotates the clamping metal fitting and retracts it from some part of the mold cavity.

However, this clamping device requires space to rotate the clamping metal, and has problems such as the clamping force of the clamping metal being lost if the pressure oil to the cylinder leaks due to damage to the piping, etc. It had a

This idea is to provide a sliding fitting on the surface of the main body that is fixed to a bolster, etc., and move this fitting with a cylinder to the retracted position and the tightening position, and when it is in the tightening position, The present invention provides a clamping device that does not lose its tightening force due to leakage of pressure oil, etc., by having a structure in which the moving body to be driven performs a wedge action.

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

The clamping device A has a leg portion 2a attached to the bolster B as seen in FIGS. 1 and 2.

2b and an upper surface 8 substantially parallel to the lower surfaces of the legs 2a and 2b, guide members 4a and 4b fixed in parallel to both sides of the upper surface 8 of the main body 1, and the guide member. 4
The tightening fittings 3 slidably provided on the inner surfaces and the upper surfaces 8 of each of a and 4b, the first cylinder 5 for retracting the tightening fittings 3, and the tightening fittings 3 are moved to the tightening position. It is composed of a cylinder block 7 having a second cylinder 6, a pressing piston 9 that presses the lower surface of the tightening fitting 3, and a tightening cylinder 10 that applies a pressing force to the pressing piston 9.

The main body 1 has guide members 4a, 4b and a cylinder block 7 arranged in series on its upper surface 8, and has a plurality of poles Nl, 12, respectively.
It is fixed.

These guide members 4a, 4b have elongated holes 13a parallel to the upper surface 8.
, 13b, whose inner surfaces 14a, 14b are fixed so as to be parallel to each other, and grooves having concave cross sections are formed on the upper surface 8 and the inner surfaces 14a, 14b.

This groove is slidably provided with a fastening fitting, and this fastening fitting 3 is connected to the elongated holes 13a, 13 of the guide members 4a, 4b.
A connecting member 16 having a protrusion 16a connected to the rod 20 of the first cylinder 5 is fixed to the upper part of the pin 15, which is inserted into the pin 15. A flat surface 17a that dynamically engages, a flat surface 17b on which the output end of the pressing piston 9 comes into contact, and an inclined surface 17c are connected, and the side surfaces are connected to the inner surfaces 14a, 14b of the guide members 4a, 4b. This configuration has a flat surface that makes smooth contact.

The cylinder block 7 includes a rod 20 having a downward recess 19 at its tip that fits loosely into the protrusion 16a of the connecting member 16;
It is formed integrally with this rod 20 and communicates with a second supply/discharge port D (through a third passage shown at 61 in FIG. 3).

) A hydraulic chamber 24 formed by a piston 21 and an inner hole 22 that are slidably fitted into the inner hole 22, a rod 20, a lid 23 that is screwed to the inner hole 22 and through which the rod 20 passes, and a filter 25. A first cylinder 5 consisting of a chamber 26 connected to the atmosphere, a rod 27 provided in parallel with this cylinder 5 and abutting against the rear end surface 3a of the fastening fitting 3, and integrally formed with this rod 27. Yes, 1st supply/discharge port C
1. A first passage 31, which will be described later. A check valve 33 is provided, and the first
A piston 29 is slidably fitted into an inner hole 28 each opening into a second passage 32 connected to a passage 31, a lid 30 through which the rod 27 passes and screwed to the inner hole 28, and a hydraulic pressure formed by the piston 29. The second cylinder 6 includes a chamber 34 and a hydraulic chamber 35 in which the first supply/discharge port C and the second passage 32 are always connected.

Hydraulic chamber 24 of the first cylinder 5 of this cylinder block 7
When pressure oil is supplied to , the fastening fitting 3 moves to the right.

Furthermore, when pressure oil is supplied to the hydraulic chamber 35 of the second cylinder 6, the tightening fitting 3 moves to the left in the figure, but when the tightening fitting 3 reaches the leftmost end, the first supply/discharge port C and 1 aisle 3
This is a configuration in which 1 is connected.

Further, the check valve 33 has a forward direction extending from the second passage 32 to the hydraulic chamber 35.

Therefore, when the first supply/discharge port C is connected to the tank, the pressure oil in the first passage 31 flows out from the first supply/discharge port C to the tank via the second passage 32 and the check valve 33.

The pressing piston 9 is connected in a perpendicular direction to an inner hole 36 provided at the lower part of the main body 1 in which the tightening cylinder 10 is provided, and has an inner hole 37 that opens on the upper surface 8 of the main body 1 and this inner hole 3.
At the upper part of 7, there is a spring receiver 4 which is fixed with a retaining ring 38 and through which a rod 40 whose tip 39 abuts the lower surface of the fastening fitting 3 passes through.
1, and a large diameter part 42 that is integrally fixed to the rod 40 and has an inclined surface 43 on the lower surface is slidably provided at the lower part of the inner hole 37, and the spring receiver 41 and the large diameter part 42 are provided in a slidable manner. A spring 44 is provided between the two.

Both the rod 40 and the large diameter portion 42 are pressed downward, and the center of the rod 40 is aligned with a line extending upward from the center line of the rod 40 when the clamping fitting 3 is in the retracted position shown in FIG.
It is located at a position perpendicular to the center line of

The tightening cylinder 10 is connected to the large diameter portion 42 of the pressing piston 9.
A moving body 50 having an inclined surface 45 that engages with an inclined surface 43 of the inner hole 36, and an inner hole 49 into which a pin 47 and a piston 48 which fit into a groove 46 provided in the inner hole 36 are slidably fitted; The rod 51b is coaxial with the central axis of the piston 48, has internal passages 52a and 52b, and is fixed to the main body 1. , passes through a lid 53 provided at the right end of the inner hole 49 of the movable body 50, and an internal passage 52b thereof is connected to the second supply/discharge port D.

Further, the rod 51a is provided in the main body 1 and the rod 51a is provided in the first body 1.
It fits into the inner hole 54 in which the passage 31 opens, and the inner passage 5
2a and the first passage 31 are connected.

In addition, an internal passage 52 is provided in the first pressure chamber 55a formed by the inner hole 49 of the moving body 50, the rod 51a, and the piston 48.
a opens, and similarly, the inner hole 49 of the movable body 50 and the lot 5
1b and the second pressure chamber 55b formed by the piston 48, an internal passage 52b opens.

Furthermore, two chambers 56a and 56b formed by the inner hole 36 of the main body 1 and the moving body 50 are provided with a filter 5, respectively.
It is constantly connected to the atmosphere via 7a and 57b.

Therefore, when pressure oil is supplied to the first pressure chamber 55a, the tightening cylinder 10 moves to the left in the figure and locks the large diameter portion 42 of the pressing piston 9 together with the rod 40 on its inclined surface 45.
to move it upward.

Conversely, when pressure oil is supplied to the second pressure chamber 55b, it moves to the right in the figure.

At this time, the large diameter portion 42 of the pressing piston 9 is pushed by the spring 44 and slides downward along the inclined surface 45 together with the rod 40.

The piston body 58, which is provided in parallel with the axis of the pressing piston 9, connects the rod 59 that comes into contact with the plane 17a and the rod 59 upward when the clamping fitting 3 is moved to the tightening position shown by the two-dot chain line. The clamping fitting 3 has a spring 60 that presses against the
This configuration has the function of returning the camera to a horizontal position.

The circuit of this clamp device is as shown in FIG.
The first passage 3 is connected to the hydraulic chamber 35 when the piston 29 of the second cylinder 6 moves the clamping fitting 3 to the tightening position.
1. Connected to the first pressure chamber 55a of the tightening cylinder 10 through the internal passage 52a, and connected to the first pressure chamber 55a through the check valve 33.
This configuration bypasses the passage 31.

Therefore, the pressure oil is supplied to the first pressure chamber 55a of the tightening cylinder 10 after the tightening fitting 3 reaches the tightening position, and the pressure oil is discharged through the check valve 33. There is.

Further, the second supply/discharge port D is connected to the second pressure chamber 55b via the internal passage 52b of the tightening cylinder 10, and is connected to the second pressure chamber 55b via the third passage 61 (not shown in FIGS. 1 and 2). It is configured to be connected to the hydraulic chamber 24 of the first cylinder 5.

The operation of this embodiment having the above configuration will be described next.

In the state shown in FIG. 1, when the first supply/discharge port C is connected to the hydraulic pressure source and the second supply/discharge port D is connected to the tank, the pressure oil flowing into the first supply/discharge port C is the hydraulic pressure of the second cylinder 6. Room 3
5 and the tip of the rod 27 presses the end 3a of the clamping bracket 3, so that the clamping bracket 3 presses the top surface 8 of the main body 1, the guide surfaces 14a and 14b of the guide member 4at4b, and the pin 15.
When the tightening fitting 3 reaches the tightening position indicated by the two-dot chain line 70a in FIG.
A position is reached where the first supply/discharge port C and the first passage 31 are connected.

At this time, the pin 15 of the fastening fitting 3 is inserted into the elongated holes 13a and 13b.
reaches the left end position, and the tip 39 of the rod 40 of the pressing piston 9 comes to oppose the position of the inclined surface 17c of the fastening fitting 3.

When the first supply/discharge port C and the first passage 31 are connected, pressure oil flows through the first passage 31 and the rod 51a of the tightening cylinder 10.
1 through the internal passage 52a into the first pressure chamber 55a, the movable body 50 of the tightening cylinder 10 begins to move leftward from the position shown in FIG.

Due to the movement of the movable body 50, the inclined surface 45 of the movable body 50 and the inclined surface 43 of the large diameter portion 42 of the pressing piston 9 slide,
Both the large diameter portion 42 of the pressing piston 9 and the rod 40 are connected to the spring 4
4 and is pressed upward against the force 4.

This pressing force acts on the inclined surface 17c of the fastening metal 3, and the fastening metal 3 rotates around the pin 15 as shown by the chain line 70b, and its tip 3b pushes the mold E onto the surface of the bolster B. Fixed to.

Next, the case where the mold E is removed from the bolster B will be described.

In the fixed state as described above, the second supply/discharge port D
is connected to a hydraulic power source and the first supply/discharge port C is connected to a tank. Pressure oil from the hydraulic source acts on the hydraulic chamber 24 of the first cylinder 5 via the second supply/discharge port D1 and the third passage 61. do.

Therefore, a moving force is generated in the piston 21 to the right, and this moving force pulls the clamping fitting 3 to the right via the rod 20. Since it remains fixed, it will not be moved immediately.

On the other hand, the pressure oil also acts on the second pressure chamber 55b via the second supply/discharge port D and the internal passage 52b of the rod 51b.

As a result, the oil in the first pressure chamber 55a is removed from the rod 51a.
The internal passage 52a1 of the first passage 31. Second passage 32, check valve 33, inner hole 28 of second cylinder 6, first supply/discharge port C
Since the liquid flows out into the tank via , the mobile body 50 first begins to move to the right.

Therefore, the rod 40 of the pressing piston 9
The plane 1 of the fastening fitting 3 is lowered as the
7b is pressed by the piston body 58.

Therefore, the tightening force of the tightening fitting 3 decreases as the movable body 50 moves to the right.

As this tightening force decreases, both the tensile force of the rod 20 of the first cylinder 5 and the pressing force of the piston body 58 act on the tightening fitting 3, so that the tip of the tightening fitting 3 moves upward and to the right. 1 and return to the position shown in Figure 1.

As mentioned above, in this clamping device, the clamping fitting 3 is automatically stored in a retracted position where it does not protrude from the side surface of the main body 1 by supplying and discharging pressure oil, which prevents the installation and removal of molds, etc. Furthermore, during tightening, after the tightening fitting 3 protrudes to a predetermined position, the movable body 10 maintains the mechanical tightening force due to the wedge action, which prevents damage to hydraulic piping and oil leakage in the cylinder section. Even if the pressure oil leaks due to leakage or the like, its holding power can always be ensured.

In the above embodiment, the pin 15, which is the center of rotation at the forward protruding position of the fastening fitting 3, is provided on the fastening fitting 3, but in some cases, it may be fixed to the guide members 4a, 4b side and the pin 15 may be fixed to the elongated hole 1.
3a and 13b may be provided on the fastening fitting 3.

As described above, according to this invention, it is possible to provide an excellent clamping device in which the clamping fitting does not become an obstruction and does not loosen even if the tightened state is caused by fluid leakage.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional side view of the central part of the embodiment of this invention;
The figure is a plan view of the same embodiment, and FIG. 3 is a circuit diagram showing the principle of the same embodiment. 1...Main body, 2a, 2b...Legs, 3
......Tightening metal fittings, 4a, 4b...Guiding member, 5...First cylinder, 6...Second
Cylinder, 7...Cylinder block, 8...
...Top surface, 9...Press piston, 10...
...Tightening cylinder, 13a, 13b...Elongated hole, 14a, 14b...Inner surface of guide member, 15
...Pin, 18...Rod, 31...
...First aisle, 32...Second aisle, 33.
...Check valve, 36...Inner hole, 45...
... Inclined surface, 55a ... First pressure chamber, 55b
...Second pressure chamber, B...Bolster, C
...First supply and discharge port, D...Second supply and discharge port.

Claims (1)

[Scope of utility model registration request] a main body having a guide surface for a fastening fitting along a predetermined direction;
It is movable forward and backward along the guide surface, and moves forward from the retracted position where it retreats to the inside of a predetermined surface of the main body, protrudes from the predetermined surface, and is in a predetermined tightened state around a pin perpendicular to the forward and backward direction in the forward position. a cylinder having a rotatable clamping fixture, a piston provided on the main body for advancing and retracting the clamping fixture, and a front end of the clamping fixture in the forward position abutting a position rearward of the pin; a pressing piston provided on the main body and having a rear surface formed as a first inclined surface so as to be able to move forward and backward and rotate the fastening fitting to the tightened state by advancing; A movable body capable of advancing and retracting across the rear surface position of the piston, having a second inclined surface abutting the first inclined surface, and formed so as to advance the pressing piston by forward movement; and the movable body. a clamping cylinder that moves forward and backward, and the first and second inclined surfaces are formed at an angle having a wedge action to prevent the movable body from retreating due to the retreating force of the pressing piston. .