JP2916979B2 - Swing type clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for retracting a clamp rod from a fixed object such as a mold by swinging the clamp rod.

[0002]

2. Description of the Related Art Swing-type clamping devices of this type include:
The technique described in Japanese Utility Model Publication No. Sho 62-28350 is known. In this method, one end of a rotation arm is eccentrically and rotatably fitted to a pivot pin provided on a housing, and the upper end of a clamp rod is rotatably fitted to one end of the arm. The hydraulic cylinder is rotatably supported via the pivot pin of the arm, and the other end of the arm is rotatably connected to a piston rod projecting downward from the hydraulic cylinder. At the time of clamping, the hydraulic cylinder is contracted. Then, one end of the arm is eccentrically rotated, and the clamp rod is driven to clamp upward.

[0003]

The above prior art has the following problems. Since the rotation arm is disposed in the space on the side of the clamp rod, the hydraulic cylinder must be provided in the space above the clamp rod. For this reason, the height of the clamp device is increased. If the clamp driving force of the hydraulic cylinder is lost for some reason during the clamping, the clamp rod is easily lowered by the gravity of the mold. Since the hydraulic cylinder is swung, it is necessary to make the hydraulic piping flexible. For this reason, piping costs are high. An object of the present invention is to reduce the height of the clamp device, prevent the clamped state from being released, and reduce the piping cost.

[0004]

According to the present invention, in order to achieve the above-mentioned object, for example, as shown in FIGS. 1 to 4, a clamping device is constructed as follows.

A base end portion 7a of the clamp rod 7 is supported on the housing 4 so as to be vertically movable and swingable in the horizontal direction, and a clamp member 8 is attached to the distal end portion 7b of the clamp rod 7.
And an elastic member 14 is provided between the housing 4 and the clamp rod 7 to press the rod 7 in the direction of the tip 7b, and the clamp rod 7 is swung inward in the horizontal direction. A swing return spring 15 is provided, and a clamping pressure receiving surface 18 and a swing operated portion 19 are provided in a middle portion 7c of the clamp rod 7 in a lateral direction,
A wedge member 22 is movably supported in the housing 4 in the lateral direction, and the wedge member 22 is wedge-engaged with the pressure receiving surface 18 to press the clamp rod 7 toward the base end portion 7a. An actuator for providing a pressing surface 23 to be operated and an operating portion 24 for engaging the operated portion 19 to swing the clamp rod 7 outward in the horizontal direction, and for reciprocating the wedge member 22 in the horizontal direction. 26 is provided in the housing 4.

[0006]

The present invention operates as follows, for example, as shown in FIG. FIG. 1A shows a swing state, and FIG.
Shows an unclamped state, and FIG. 1C shows a clamped state.

In the swing state shown in FIG. 1A, the wedge member 22 is driven by the actuator 26 to the left unclamping side. As a result, the operating portion 24 of the wedge member 22 presses the operated portion 19 of the clamp rod 7 leftward against the swing return spring 15 and the elastic member 1
4 presses the clamp rod 7 downward, and the clamp rod 7 is switched to the swing position X.

When switching from the swing state to the clamp state, the actuator 26 drives the wedge member 22 to the right clamp side. Then, first, as shown in FIG. 1B, the clamp rod 7 is switched to the unclamping position Y by the swing return spring 15. Subsequently, as shown in FIG. 1C, the pressing surface 23 of the wedge member 22 engages with the pressure receiving surface 18 of the clamp rod 7, and the pressing surface 23
Is driven upward. As a result, the clamp rod 7 is switched to the clamp Z position, and the mold 6 is fixed to the lower surface of the support base 1 by the clamp 8.

[0009]

The present invention has the following effects because it is constructed and operates as described above. Since the wedge member that engages with the clamp rod is reciprocated in the lateral direction, the above-described conventional rotation arm can be omitted. For this reason,
An actuator is provided in the lateral space of the clamp rod to reduce the height of the clamp device, and the clamp device can be simply manufactured. Even if the clamp driving force of the actuator is lost for some reason during clamping, the clamp rod can be kept in the clamped state by the wedge engaging force between the pressing surface of the wedge member and the pressure receiving surface of the clamp rod, so that the mold or the like can be used. Displacement movement and dropping of the fixed object can be reliably prevented.

Since the actuator does not need to be swung as in the above-mentioned prior art, it is not necessary to make the pressure hose, the electric wire, and the like flexible, and the piping cost is reduced. In the case where the operated part for swinging is provided near the base end of the clamp rod, the clamp rod can be largely swung by a small stroke of the wedge member, so that the energy consumption of the actuator is small.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram illustrating the operation of the clamp device. FIG. 2 is a longitudinal sectional view when the clamp device is switched to an unclamped state. FIG. 3 is a cross-sectional view of FIG.
FIG. 3 is a view taken along line III-III. FIG. 4 is a sectional view taken along the line IV-IV in FIG.
FIG.

First, the configuration of the clamp device will be described with reference to FIGS. A housing 4 is placed on the upper surface of the flange 2 of the support 1 via a shim 3, and the housing 4 has a plurality of bolts 5 (only one is shown in FIG. 3).
Is fixed to the flange 2. The mold 6 carried into the lower side of the housing 4 can be fixed to the lower surface of the support table 1 by a clamp tool 8 provided at a lower end portion 7b of a clamp rod 7 extending vertically. Rod support grooves 9 and 10 are formed in the support base 1 and the mold 6 respectively.

An upper end 7a of the clamp rod 7 is supported by the housing 4 so as to be vertically movable and swingable in a lateral direction (left and right in FIG. 2; the same applies hereinafter). More specifically, the up-down direction middle part 7c of the clamp rod 7 is connected to both side walls 4a of the housing 4.
Is guided up and down. Further, a pin 12 protruding from the upper end 7a of the clamp rod 7 is inserted into the groove 13 of the housing 4 from above, and is elastically pressed downward by a descending spring 14 which is an elastic member. Also,
Between the upper part of the clamp rod 7 and the lower part of the housing 4, there are provided swing return springs 15 for swinging the clamp rod 7 inward in the horizontal direction.

A vertically long through hole 17 is formed in the middle of the clamp rod 7. A pressure receiving surface for clamping 18 is formed on the upper peripheral surface of the through hole 17.
A swing operated portion 19 is formed on the peripheral wall of the seventh. The lower portion of the housing 4 extends into the lower half of the through hole 17, and the extended portion 21 supports the wedge member 22 movably in the lateral direction. The wedge member 22 has a pressing surface 23 that engages with the pressure receiving surface 18 and presses the clamp rod 7 upward, and a pressing surface 23 that engages with the operated portion 19 and holds the clamp rod 7 in the lateral direction. An operation unit 24 that swings outward is provided. The inclination angle of the pressing surface 23 of the wedge member 22 is set to 12 degrees in this embodiment. Note that the above-mentioned inclination angle is preferably in a range of 5 degrees to 20 degrees.

A pneumatic cylinder 26 for reciprocating the wedge member 22 in the lateral direction is fixed to the housing 4.
That is, the cylinder tube 2 fixed to the housing 4
A piston 28 is hermetically inserted into 7, and a clamp working chamber 29 is formed on the left outside thereof, and an unclamping working chamber 30 is formed on the right outside thereof. The wedge member 22 is fixed to a piston rod 31 projecting leftward from the piston by a bolt 32 (see FIG. 4). A spacer 33 for adjusting the swing angle of the clamp rod 7 is mounted on the left surface of the piston 28. The piston 28 includes two clamp state holding springs 34.
34 represses to the right. Reference numeral 35 is a spring receiving hole.

An indicator rod 37 for detecting the lateral stroke of the wedge member 22 is provided, and the tip of the indicator rod 37 is inserted into the viewing window 39 of the cover plate 38. A cover block 41 is provided on the left side of the clamp rod 7.
Are fixed by a plurality of bolts 42 (here, only one is shown), and the dust cover 43 is fixed to the right surface of the clamp rod 7 by the plurality of bolts 44. Further, a limit switch 45 for detecting a clamp state and a limit switch 46 for detecting a swing state are provided above the clamp rod 7.

Next, the operation of the clamp device will be described with reference to FIG. FIG. 1A shows a swing state, and FIG.
FIG. 1B shows an unclamped state, and FIG. 1C shows a clamped state.

In the swing state shown in FIG. 1A, compressed air is discharged from the clamping operation chamber 29 and compressed air is supplied to the unclamping operation chamber 30 so that the piston 28
Is driven to the left. As a result, the operating portion 24 of the wedge member 22 presses the operated portion 19 of the clamp rod 7 leftward against the swing return spring 15, and the descending spring 14 presses the clamp rod 7 downward. The clamp rod 7 has been switched to the swing position X.

When switching from the swing state to the clamp state, compressed air is discharged from the unclamping working chamber 30 and compressed air is supplied to the clamping working chamber 29 to drive the piston 28 to the right. Go. Then, first, as shown in FIG. 1B, the wedge member 22 is moved rightward, and the clamp rod 7 is switched to the unclamping position Y by the swing return spring 15.

Subsequently, as shown in FIG. 1C, the pressing surface 23 of the wedge member 22 drives the pressure receiving surface 18 of the clamp rod 7 upward against the descending spring 14. As a result, the clamp rod 7 is switched to the clamp Z position, and the clamp 8 fixes the mold 6 to the lower surface of the support base 1.

In the clamp state, the clamp state holding spring 34 (see FIG. 4) presses the wedge member 22 to the clamp side via the piston 28 and the piston rod 31. Therefore, even if the pressure in the clamp working chamber 29 is lost due to breakage of the compressed air supply pipe or the like, the wedge between the pressing surface 23 of the wedge member 22 and the pressure receiving surface 18 of the clamp rod 7 is formed. The clamp rod 7 is maintained at the clamp position Z by the engagement force. This can prevent the mold 6 from moving or falling.

When switching from the clamped state of FIG. 1 (c) to the unclamped state, the clamp device operates in the reverse procedure. That is, the compressed air is discharged from the clamping operation chamber 29 and the unclamping operation chamber 3 is discharged.
Compressed air is supplied to the piston to drive the piston 28 to the left. Then, first, as shown in FIG. 1B, the wedge engagement between the pressing surface 23 and the pressure receiving surface 18 is released, and the clamp rod 7 is moved to the unclamping position Y by the descending spring 14. Subsequently, as shown in FIG.
The operating section 24 presses the operated section 19 leftward against the swing return spring 15 to switch the clamp rod 7 to the swing position X.

The above embodiment has the following advantages. Since the pneumatic cylinder 26 is provided in the space on the side of the clamp rod 7, the height of the clamp device is low. Even when the clamp driving force of the pneumatic cylinder 26 is lost, the clamp state can be prevented from being released by the wedge engaging force of the wedge member 22. Since the operated part 19 for swinging is provided in the upper part of the clamp rod 7, the wedge member 22 is provided.
The stroke of the clamp rod 7 can be largely swung by a small stroke. For this reason, the consumption of the compressed air of the pneumatic cylinder 26 is small. According to an experimental result comparing the clamp device of the present embodiment with the above-described conventional device, the energy consumption of the device of the present invention was reduced from 55 to 70% of the conventional device.

The pneumatic cylinder 26 is mounted on the housing 4
, And does not need to be swung as in the above-mentioned prior art, so that there is no need to provide a flexible pressure hose, and piping costs are reduced. When switching the clamp rod 7 from the unclamping position Y to the clamping position X, it is only necessary to guide the clamp rod 7 straight. For this reason, the clamp 8 fixed to the lower end of the clamp rod 7 can be brought into perpendicular contact with the lower surface of the mold 6, and the adjustment therefor is also easy.

FIG. 5 shows a modification and is a partial view corresponding to FIG. In this case, the clamp 8 protrudes inward (to the right in the figure) from the lower end 7b of the clamp rod 7. The flange portion 49 of the mold 6 is pressed and fixed to the lower surface of the support base 1 by the clamp 8 described above. In this modification, the rod receiving grooves 9 and 10 shown in the above-described embodiment are used.
Need not be provided on the support base 1 and the mold 6, so that the processing cost for them can be omitted.

The above-described embodiment and the above-described modified examples can be modified as follows. The actuator for reciprocatingly driving the wedge member 22 in the lateral direction includes the pneumatic cylinder 2 described above.
A hydraulic cylinder may be used instead of 6, and a single-acting spring return type may be used instead of the double-acting type. Further, the actuator may be one that moves the wedge member 22 forward and backward by screw fitting instead of the fluid pressure cylinder.

The elastic member for pressing the clamp rod 7 downward may be urethane rubber or the like instead of the descending spring 14. The object fixed by the clamp device according to the present invention may be another type of object such as a workpiece to be machined, instead of the mold 6.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views of the operation of a clamp device according to an embodiment of the present invention. FIG. 1A shows a swing state, FIG. 1B shows an unclamped state, and FIG. The state is shown.

FIG. 2 is a detailed view of the clamp device, corresponding to FIG. 1 (b).

FIG. 3 is a view taken on line III-III of FIG. 2;

FIG. 4 is a sectional view taken on line IV-IV of FIG. 2;

FIG. 5 is a partial view showing a modification of the present invention and corresponding to FIG. 2;

[Explanation of symbols]

4. Housing, 7 Clamp rod, 7a Base end
(Upper end), 7b ... tip (lower end), 7c ... middle part, 8 ...
Clamping tool, 14 elastic member (down spring), 15 swing return spring, 18 pressure receiving surface, 19 operated part for swing, 2
2 ... wedge member, 23 ... pressing surface, 24 ... operation part, 26 ... actuator (pneumatic cylinder).

Claims (1)

(57) [Claims] A clamp rod (7) is mounted on a housing (4).
The base end (7a) of the clamp rod is supported so as to be movable vertically and swingable in the lateral direction, and a clamp tool is attached to the distal end (7b) of the clamp rod (7).
An elastic member (14) is provided between the housing (4) and the clamp rod (7) to press the rod (7) in the direction of the tip (7b). Swing return spring for swinging the clamp rod (7) inward in the horizontal direction
(15), a pressure receiving surface for clamping (18) and a operated portion for swinging (19) are provided laterally at an intermediate portion (7c) of the clamp rod (7), and a wedge is provided on the housing (4). The member (22) is movably supported in the lateral direction, and the wedge member (22) is attached to the pressure receiving surface (18).
Wedge-engaged with the clamp rod (7) at the base end.
A pressing surface (23) for pressing in the direction of (7a) and an operating portion (24) that engages with the operated portion (19) and swings the clamp rod (7) outward in the lateral direction. An actuator (26) for reciprocating the wedge member (22) in the lateral direction is provided on the housing (4).