JPH042018Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial field of application> This invention is used when attaching molds of injection molding machines, press machines, etc. to bases, etc., and prevents the clamp rod that acts as a clamp from being difficult to replace when replacing the mold. This invention relates to a type of clamp device that swings to a retracted position.

<Prior Art> A conventional clamp device of this type is disclosed in, for example, Japanese Utility Model Application No. 60-52033. As shown in Fig. 5, a clamp rod 4 is connected via a connecting shaft 5 to a piston rod 3 of a cylinder device 2 attached to a main body 1 so as to be able to swing together with the connecting shaft 5, and the piston rod 3 is retracted upward. In this state, the mold 7 is tightened and fixed to the base 6 as shown in the figure. When the piston rod 3 advances a little downward from this state, the clamp rod 4 is moved to the loosened position where it is advanced in the same direction as the piston rod 3. During this time, the guide surface 10a of the cam 10 and the trochanter 11 are in contact with each other to restrict the clamp rod 4 in a state along the forward and backward direction of the drive section 12. When the piston rod 3 moves further, the pinion 8 provided on the connecting shaft 5 is engaged with a rack 9 provided on the main body 1, and the clamp rod 4 is swung to the right in the figure about the connecting shaft 5 to reach a predetermined retracted position shown by the imaginary line. Also,
When piston rod 3 moves backward, pinion 8
is engaged with the latch 9, and the clamp rod 4 returns from the retracted position to the loosened position. When the piston rod 3 further retreats, the guide surface 10a of the cam 10 and the trochanter 1
1 comes into contact with the clamp rod 4, and the clamp rod 4 is regulated along the forward and backward movement direction of the drive section 12, and the engaging portion of the clamp rod tightens the clamped body of the mold, resulting in a clamped state.

<Problems to be solved by the invention> In this conventional device, the clamp rod moves back and forth in the axial direction without meshing with the rack fixed to the main body and the pinion connected to the clamp rod, and the rack and pinion mesh with each other. Since the clamp rod swings together with the pinion, it is not possible to adjust the swing angle of the clamp rod after assembly if a cylinder device with a constant stroke is used. Therefore, if the swing angle of the clamp rod is too large and the clamp rod comes into contact with nearby structures, the swing angle may be reduced to avoid contact with each other, or if the swing angle is too small, the mold There is a problem in that when it is difficult to attach and detach the mold from the base, it is not possible to increase the swing angle to facilitate attachment and detachment of the mold.

<Means for Solving the Problems> The present invention consists of a main body, a clamp cylinder provided in the main body in which a piston rod of a piston inside the cylinder moves back and forth along a predetermined straight line, and a distal end that engages a clamped part. a clamp rod having a joint portion and a proximal end rotatably connected to the distal end of the piston rod via a connecting shaft; and a clamp rod supported by a shaft parallel to the connecting shaft at a position slightly toward the distal end of the connecting shaft. a trochanter, and an arc-shaped concave surface located at a position closer to the tip of the clamp rod than the trochanter and guiding the trochanter against the movement of the piston rod toward the advancing end of the advancing and retracting section, and is fixed to the main body. The cam is comprised of a cam and a cam position adjusting section provided to change the rotational position of the cam around a predetermined axis parallel to the connecting axis.

<Function> For example, in the case of fixing a mold to a predetermined base surface, this clamp device is provided with a U-groove spanning the edge of the mold and the edge of the base, and Place the main body on the base so that the clamp rod passes through and the engaging part is located at the U-groove end of the mold, the clamp cylinder is located at the U-groove end of the base, and so that the piston rod moves forward and the clamp rod is removed from the U-groove of the mold. Used by fixing it to the side. When the clamp cylinder is shortened while the clamp rod of the clamp cylinder is in the U-groove, the engaging portion comes into contact with the clamped portion of the mold, clamping the mold toward the base and creating a clamped state. When replacing the mold from this clamped state, move the piston rod of the clamp cylinder forward until the trochanter is in contact with the concave surface of the cam, and the engaging part will separate from the clamped part and return to the loosened position. When the piston rod is moved further forward, the trochanter is guided by the concave surface of the cam, and the clamp rod swings outward away from the mold around the connecting shaft to reach a predetermined retracted position. When the clamp rod is moved backward and the trochanter is away from the concave surface of the cam, if the cam is adjusted to move closer to the trochanter and fixed in that position, the swing angle of the clamp rod will return to its original value according to the amount of cam movement. Conversely, when the cam is moved away from the trochanter, the swing angle of the clamp rod decreases in accordance with the amount of movement of the cam.

<Example> An example of this invention will be described with reference to FIGS. 1 to 4. In the figure, 19 is the main body, 20 is a clamp cylinder and a driving device for moving the piston rod 24 forward and backward, 21 is a clamp rod, and 23
is the cam, and 33 is the trochanter.

The main body 19 has a substantially U-shape in which a mounting flange 27 fixed along the surface of the end of the base 28 and left and right side walls 25 and 26 are continuous above the mounting flange 27,
Elongated holes 32, 32 are bored in the left and right side walls 25, 26 along the direction of movement of the piston rod.

The clamp cylinder 20 is constituted by a hydraulic cylinder, and the end surface on the side of the piston rod 24 connected to the piston is fixed to the upper surface of the left and right side walls 25, 26 of the main body 19, and the forward and backward direction of the piston rod 24 corresponds to the direction of movement of the mold 29 to be clamped. It is oriented perpendicularly to the section 30.

The clamp rod 21 has a distal end portion 31 that engages with the clamped portion 30 of the mold 29, and a groove 49 with a rectangular cross section is formed on the upper surface of the base end portion 48 in the direction in which the clamp rod 21 swings. . The tip of the piston rod 24 is inserted into this groove 49 and is swingably connected by a connecting shaft 22, and both ends of the connecting shaft 22 are inserted into the long holes 32 of the left and right side walls 25, 26 of the main body 19. It is inserted. The long diameter of this elongated hole 32 is determined by the length of the connecting shaft 22 when the piston rod 24 moves back and forth from the backward end position to the forward end position.
Both ends are sized to allow sliding. A ball plunger 44 is provided at the bottom of the groove 49 on the center line of the clamp rod 21, and a ball plunger 44 is provided on the center line of the clamp rod 21.
A circular hole 46 is provided in the distal end surface of the clamp rod 21 into which a ball 45 of a ball plunger 44 can engage when the clamp rod 21 is in the hanging position shown in FIG.

The cam 23 is a crescent-shaped flat plate member having an arc-shaped concave surface 65 on the upper surface and an arc-shaped convex surface 66 on the lower surface. The cam 23 is attached to the cam 2 with the concave surface 65 facing upward.
The end portion 52 of No. 3 on the side of the base 28 is fixed to the inner surface of the right side wall 26 of the main body by being tightened with a fixing bolt 51.

38 is a position adjustment part for the cam 23, which is located on the right side wall 2.
Adjustment bolt 54 is attached to the convex portion 53 protruding inward of 6.
are screwed together. The tip of the adjustment bolt 54 is
It abuts against the outward facing end 50 of the cam 23 to prevent the cam 23 from shifting from the set position when pressed against the rotor 33. By adjusting the position of the adjustment bolt 54 back and forth, the end 50 of the cam 23
The fixed position of the clamp rod 21 can be changed up or down, thereby making it possible to finely adjust the swing angle of the clamp rod 21 within a range of about 15 degrees. The adjusting bolt 54 is tightened to the convex portion 53 by a nut 55 to prevent loosening.

The trochanter 33 is pivotally supported by the clamp rod 21 at a position on the distal side of the connecting shaft 22 so that it rolls against the upper concave surface 65 of the cam 23 when the piston rod 24 moves forward. As shown in FIG. 1, when the clamp rod 21 is in the clamped condition, the trochanter 33 is separated from the concave surface 65 of the cam 23.

Reference numeral 35 denotes a bounce prevention part, which includes a block 37 having two through holes 36, a short cylindrical stopper 39, a low-resilience rubber 40, a thin plate 41, and a stopper 3.
The block 37 of the spring prevention part 35 is arranged so that the opening surface of the through hole 36 is aligned horizontally and the base 28 and the clamp rod 21 are aligned horizontally.
It is bolted and fixed to the inner surface of the mounting flange 27 between the two. The openings of the two through holes 36 on the clamp rod 21 side are slightly narrower. A stopper 3 is inserted into the through hole 36 from the clamp rod 21 side.
9, low resilience rubber 40, thin plate 41 and through hole 3
A position adjustment bolt 42 screwed into the block 37 is disposed, and the side surface of the position adjustment bolt 42 is tightened by a bolt 43 screwed onto the top surface of the block 37 to prevent loosening.

This clamp device is attached to the end of the base 28 of the press machine by tightening the mounting flange 27 with bolts, and is used to attach the mold 29 to the base 28. As shown in FIGS. 1 to 3, a U groove 5 is formed across the edge of the mold 29 and the edge of the base 28.
7 is provided, and the clamp rod 21 passes through this U groove 57, and the engaging part 31 is located at the clamped part 30 at the end of the U groove 57 of the mold 29, and the mold 29 is connected to the base 2.
The state in which it is tightened and fixed to the lower surface of 8 is the clamped state. At this time, the piston rod 24 is in the retracted position, and the ball 45 of the ball plunger 44 engages with the circular hole 46 provided on the distal end surface of the piston rod 24.
The side surface is in contact with the stopper end surface 39a, and the longitudinal axis of the clamp rod 21 coincides with the direction of movement of the piston rod 24.

When replacing the mold 29 from this clamped state, the piston rod 24 of the clamp cylinder 20 is advanced downward in the figure until it reaches the forward position at the lower end from the retracted position at the upper end and stops. As a result, the engaging portion 31 of the clamp rod 21 descends from the tightened position to the loosened position, swings, and stops at the retracted position where it is removed from the mold 29. The above loosened position is the position of the engaging portion 31 when the trochanter 33 descends from a position away from the concave surface 65 of the cam 23 and contacts the concave surface 65 of the cam 23, and from this state the piston rod 24 further descends. As a result, the trochanter 33 is guided outwardly along the concave surface 65 of the cam 23, and the clamp rod 21 is therefore swung outwardly about the connecting shaft 22. When the piston rod 24 reaches the lowest position, its swinging stops. This swung position of the clamp rod 21 is the retracted position, and the mold 29 is replaced. This swing angle is approximately 30 degrees. Generally, the swing angle can be changed up to about 90° depending on the cylinder stroke and cam position.

If the clamp rod 21 interferes with other objects in this retracted position, return the clamp rod 21 to its original tightening position, loosen the fixing bolt 51 about one turn, and then tighten the nut 55 of the position adjustment part 38. Loosen it and screw the adjustment bolt 54 toward the base 28, or conversely loosen it. This allows cam 2
Move the end 50 of the cam 23 slightly upward or downward, then tighten the fixing bolt 51 about one turn to prevent the cam 23 from shifting.
Tighten the adjustment bolt 54 to the convex portion 53 with. By adjusting the end portion 50 of the cam 23 up and down in this manner, the swing angle of the clamp rod 21 can be increased or decreased within a range of approximately 15 degrees, thereby avoiding interference with other objects. .

Next, in order to clamp the mold 29, the piston rod 24 of the clamp cylinder 20 is moved upward in the drawing, and the engaging portion 31 of the clamp rod 21 is moved from the retracted position where it is removed from the mold 29 to the clamped portion 30. When the piston rod 24 is swung downward to the loosened position and the piston rod 24 is further retreated, the engaging portion 31 of the clamp rod 21 engages the clamped portion 30 of the mold 29.
The mold 29 is tightened to the base 28 by pressing . As a result, the clamp rod 21 returns to its original clamped state through a path opposite to that described above. Note that the engaging portion 31 of the clamp cylinder 20 is connected to the mold 2.
9 from the position removed from the U groove 57 to the loosened position, the clamp rod 21 is swung around the connecting shaft 22 from the retracted position toward the base 28 by the tensile force of the return spring 59. This swing path is the trochanter 3
3 is a path that moves along the concave surface 65 of the cam 23, and the clamp rod 21 moves along the piston rod 24.
The spring 59 swings the spring 59 back to the loosened position in substantially the same direction as the advancing and retracting direction, and the spring 59 contacts the stopper 39 of the flip-up prevention mechanism and stops. At this time, the repulsive force of the clamp rod 21 caused by the contact between the clamp rod 21 and the stopper 39 is applied to the low repulsion rubber 40.
Most of it was absorbed by Clamprod 2.
The ball 45 of one ball plunger 44 engages with the circular hole 46 of the piston rod 24, and the clamp rod 21 reliably stops swinging at a position in the same direction as the movement direction of the piston rod 24. Therefore, when the piston rod 24 retreats, the clamp rod 2
The first engaging portion 31 tightens and clamps the mold 29 to the base 28 in a state parallel to the clamped portion 30 of the mold 29.

60 and 61 are limit switches; 63 is a protrusion for operating the limit switch 60 provided on the side surface of the proximal end of the clamp rod 21;
is a protective cover for the limit switches 60 and 61. Limit switch 60 is clamp rod 21
The limit switch 61 is for detecting the operating protrusion 63 and displaying the clamped state when the clamp rod 21 is in the tightening position, and the limit switch 61 is for detecting the trochanter 33 and displaying the clamped state when the clamp rod 21 is in the retracted position. belongs to.

<Effects of the invention> According to this invention, since the cam can be moved up and down by the cam position adjustment section, the swing angle of the clamp rod can be adjusted steplessly within a range of about 15 degrees. Therefore, even if a clamp cylinder in which the stroke of the piston rod is constant is used in the clamp device, the swing angle of the clamp rod can be adjusted. In addition, since the guide surface of the cam that swings the clamp rod by guiding the trochanter is formed into a concave surface, the swing angle of the clamp rod is the same compared to a conventional clamp device with a flat guide surface. Since the clamping device of this invention can use a clamping cylinder with a short piston stroke, there is also the effect that the clamping device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a partially vertical right side view showing one embodiment of the swing type clamp device according to this invention, Fig. 2 is a partially vertical front view of the same embodiment, and Fig. 3 is a partially vertical left side view of the same embodiment. , FIG. 4 is a sectional view taken along line A-A in FIG. 1,
FIG. 5 is a partially vertical side view showing an example of a conventional swing type clamp device. 19...Main body, 20...Clamp cylinder, 2
1... Clamp rod, 22... Connection shaft, 23...
...Cam, 24...Piston rod, 28...Base, 29...Mold, 30...Clamped part, 31
...Engaging portion, 33... Trochanter, 35... Jumping prevention portion, 38... Position adjustment portion, 44... Ball plunger, 48... Base end portion, 57... U groove, 59
...Return spring.

Claims (1)

[Scope of utility model registration request] a main body, a clamp cylinder provided in the main body in which a piston rod of a piston in a cylinder moves back and forth along a predetermined straight line; and a clamp cylinder having an engaging part for a clamped part at a distal end, and a proximal end connected to the distal end of the piston rod. A clamp rod rotatably connected via a connecting shaft, a trochanter supported by an axis parallel to the connecting shaft at a position slightly distal to the connecting shaft of the clamp rod, and a distal end of the clamp rod beyond the trochanter. a cam fixed to the main body and having an arc-shaped concave surface that guides the trochanter with respect to the movement of the piston rod toward the advancing end of the advancing and retracting section; A swing type clamp device comprising a cam position adjustment section provided to change the rotational position around a predetermined axis.