JPH042019Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a clamping device used for clamping molds, etc. of injection molding machines, press machines, etc. in use.

<Prior art> An example of a conventional clamp device is the
There is one disclosed in No. 36340. This mold clamping device fixes a clamp body to the platen surface on which the mold is mounted, and a wedge with a sloped surface on the platen surface side is inserted into the clamp body so that it can move forward and backward parallel to the platen surface, and the wedge is attached to the back side. A clamp pawl having a pressure receiving surface that engages with the wedge is pivotally supported so as to be able to fall forward, and a clamp pawl retracting mechanism is provided between the clamp pawl and the wedge. With this configuration, no machining is required on the mold and platen side, and the mold can be locked using the wedge method without having to protrude the clamp claw, clamp claw retracting mechanism, and wedge into the mold mounting space during unlocking. can. This clamp claw retraction mechanism is
It consists of pins that protrude from the back side on both sides of the pivoting end of the clamp claw, and pull-back pieces that are provided on both sides of the front end of the wedge so as to extend toward the platen surface. In the retraction process of the wedge, the pull-back piece engages with the pin to rotate the clamp claw away from the base of the mold and pull it back.

<Problems to be solved by the invention> In the conventional clamping device, the clamping claw is pushed by the wedge and rotates forward to clamp the base of the mold between the clamping claw and the platen surface. Because of the structure, only when the thickness of the base is a predetermined thickness corresponding to this clamping device, the slope surface and the pressure receiving surface come into surface contact and a predetermined clamping force is generated by the wedge effect due to the wedge. However, in reality, high machining accuracy is required to machine the base to a predetermined thickness so that the slope surface and the pressure-receiving surface come into surface contact and are in a clamped state.
If the thickness of the base is a little thicker than the specified thickness above, there may be no problem, but the inclined surface of the wedge and the pressure receiving surface of the clamp claw will not be in surface contact but will be in line contact on the tip side, and conversely, the base will not be in the specified thickness. If it is even slightly thinner than the base thickness, the rear part of the sloped surface will come into line contact with the rear end of the pressure receiving surface of the clamp claw and press it, so the clamping force at this time will clamp the base of the specified thickness above. There is a problem in that the force is smaller than the force that can be used.

<Means for Solving the Problems> The present invention has a main body fixed to a predetermined base surface and having a through hole extending in a direction substantially along the base surface, and a main body fixed to a predetermined base surface and having a through hole in a direction opposite to the base surface. a wedge-shaped member housed so as to be movable in the direction of the through hole along the inner surface thereof, and having a slope on the base side that gradually approaches the front end in the direction of advance and retreat with respect to the opposite surface;
a forward and backward drive unit connected to the rear end of the wedge-shaped member; and a pressure-receiving surface that is housed on the base side of the wedge-shaped member in the through-hole so as to be able to move forward and backward in the direction of the through-hole and is made of a slope in contact with the slope. A press having a plurality of trochanters which are formed at the tip of the surface on the base side as a press part, and are supported via springs so as to protrude rearward from the press part toward the base side and come into contact with the inner surface of the through hole. and the wedge-shaped member moves forward with the pressing member halfway through the forward movement of the wedge-shaped member by the driving unit, and from the halfway point, only the wedge-shaped member advances, and with the pressing member from the halfway point in the retreat of the wedge-shaped member by the driving unit. It consists of interlocking means provided so as to move backward.

<Operation> When clamping the mold, the drive unit drives the wedge-shaped member from the retreated position to the advanced position, so that as the wedge-shaped member moves forward, the pressing member projects from the through-hole from the inside position. It moves forward toward the protruding position and stops halfway, and then only the wedge-shaped member moves forward and the slope of the wedge-shaped member presses the pressure receiving surface of the pressing member,
A support spring provided on the base side surface of the pressing member is compressed to move the pressing member toward the base. As a result, the pressing portion presses the clamping edge of the mold in a direction perpendicular to the base surface to bring the mold into a clamped state. To release the mold clamp state, the wedge-shaped member is driven from the forward position to the retreated position in a direction that creates a gap between the wedge-shaped member and the pressing member, and the spring for supporting the pressing member is released by this gap. expands, and the pressing part moves away from the clamping edge of the mold. When the wedge-shaped member further retreats, the pressing member also retreats together with the wedge-shaped member to reach the position inside the through hole.

<Example> An example of this invention will be described with reference to FIGS. 1 to 4. As shown in FIGS. 1 and 2, this clamping device comprises a wedge-shaped member 1 provided in a main body 3 by a forward/backward drive unit 12 consisting of a single cylinder mechanism.
0 and the pressing member 9 are operated to fix the mold 18 to the base surface 2. The main body 3 has a substantially rectangular cylindrical outer shape and is composed of an outer wall portion 13 and a lower wall portion 14, and is fixed to the base plate 2 with four bolts 50.
The outer wall portion 13 has a circular cross section and has a through hole 4 extending along the base surface 2 and a base surface 2 continuing from the through hole 4.
The lower wall 14 is sandwiched between the outer wall 13 and the base surface 2 and fixed to the outer wall 13 with bolts 52. A stopper 1 is attached to the inner edge of the open end of the main body groove 51 on the mold 18 side on the base surface 2 side, that is, on the lower wall portion 14.
5 is provided protrudingly. A wedge-shaped member 10 is provided in the through hole 4 of the main body 3, and a pressing member 9 is provided in the groove 51.

The wedge-shaped member 10 has a cylindrical outer shape and is provided with a slope 53 on the base surface 2 side, thereby forming a wedge shape that gradually becomes thinner toward the end on the mold 18 side. can be moved in the penetrating direction. The slope angle a of this slope 53 is about 7 to 8 degrees,
A groove 1 in the direction perpendicular to the penetrating direction is provided in the middle of the slope 53.
6 is provided. The other surface of the wedge-shaped member 10 facing the through hole 4 is formed parallel to the through hole 4, and the end opposite to the mold 18 is connected to the rod 21 at the tip of the piston 20 of the cylinder mechanism. A screw hole 5 is provided for threaded connection.

The forward/backward drive unit 12 drives a piston 20 fitted into the cylinder 19 using pressure oil.
As seen in the figure, the right end of the rod 21 on the right side of the piston 20 is threadedly connected to the screw hole 5 of the wedge-shaped member 10, and the piston 20 is connected to the cylinder 19 and the main body 3.
An annular block 22 fixed inside the joint part of
It can be slid along the inner peripheral surface of. piston 20
A disk-shaped retaining portion 23 is provided at the left end in the figure, and this retaining portion 23 and the annular block 2
An annular second piston 24 is provided between the two. The outer peripheral surface of the second piston 24 contacts the inner peripheral surface 25 of the cylinder 19, and the inner peripheral surface of the second piston 24 contacts the outer peripheral surface 26 of the piston 20 so that it can slide. Pressure oil supply and discharge ports 41 and 42 are provided on the side surface of the cylinder 19, as shown in FIG. The first supply/discharge port 41 is a chamber 19a formed at the right end position in the cylinder 19, that is, at the position where the annular block 22 and the second piston 24 come into contact.
The second supply/discharge port 42 is provided so as to communicate with the left end position inside the cylinder 19 .

The structure of the piston 20 and the second piston 24 described above is such that the force with which the piston 20 pushes the pressing member 9 toward the protruding position is smaller than the force with which the second piston 24 pulls the pressing member 9 back toward the through-hole inner position. There is. This allows the wedge-shaped member 10 to be removed even if it is caught between the inner wall of the main body 3 and the pressing member 9.

The pressing member 9 is inserted into the groove 51 of the main body 3. The upper surface has a pressure receiving surface 54 along the slope 53 of the wedge-shaped member 10, the lower surface has a surface 7 substantially parallel to the base surface 2, and is formed into a wedge shape that gradually becomes thicker toward the mold 18 side. . The pressing member 9 is connected to the groove portion 5
1 in the penetrating direction, and the base surface 2
It is possible to move slightly in the direction perpendicular to . Pressing member 9
The base surface 2 side of the mold 18 side end is provided with a pressing part 6 formed in a convex shape, and the lower surface 7 near the drive part 12 side has two openings along the direction of the through hole 4. 2
7 is drilled. A square spring 28 is accommodated in each of the openings 27, and a trochanter 29 is disposed between the lower end of the square spring 28 and the inner surface of the main body 3.
The square spring 28 pushes down the two trochanters 29 toward the base surface 2 to support the pressing member 9, thereby pressing the pressing member 9 toward the wedge-shaped member 10. One aperture 30 is bored in the pressure receiving surface 54 of the pressing member 9 at a position between the two apertures 27 in the lower surface 7 . A square spring 31 is housed in the opening 30, and a roller 33 is arranged above the square spring 31.
At the left end of the pressing member 9, there is a rod 3 extending to the left.
4 are coupled so as to be vertically movable.

The rod 34 slidably penetrates the left end wall of the main body 3 and protrudes outward, and a cylindrical sensed member 35 is provided at the tip of the rod 34. Inside the cover 36 that covers the tip of the rod 34, the sensed member 35 is located at the corresponding movement position when the piston 20 moves forward to the right or backward to the left. Limit switches 37, 37 are provided to sense certain conditions.

The terminal block 38 is a stand for fixing the lead wire terminals of the micro switches 37, 37 and for connecting the lead wires and external electric wires.

A pin 39 is provided at the tip of the slope 53 of the wedge-shaped member 10 so as to protrude toward the base surface 2, and is inserted into a groove 40 provided in the tip of the pressure receiving surface 54 of the pressing member 9 in the direction of the through hole.

The above-described clamping device is attached to the base surface 2 as shown in FIG. 1, and when the mold 18 is not clamped, the wedge-shaped member 10 is located in the through hole and the pressing member 9 is located in the groove. be. Pressure receiving surface 54
The side roller 33 is engaged with the groove 16 of the wedge-shaped member 10 by the extension of the square spring 31, and this square spring 31 has a weaker extension force than the square spring 28 for supporting the pressing member 9. Yes, square spring 2 for support
8 presses the pressing member 9 toward the wedge-shaped member 10 side. As a result, the pressing portion 6 is positioned slightly above the clamping edge 17 of the mold 18. Mold 18
When clamping, pressurized oil is supplied to the rear surface of the piston 20 as shown in FIG. 2, and the drive section 12 is operated. The wedge-shaped member 10 is guided through the through hole 4, and since the roller 33 is engaged with the groove 16, the pressing member 9 moves forward along the groove 51 together with the wedge-shaped member 10. During this forward movement, the right end of the pressing member 9 on the lower surface 7 side comes into contact with the stopper 15 of the lower wall portion 14 of the main body 3, and the pressing member 9 stops. At this time, the pressing part 6 is located just above the clamping edge 17. When the wedge-shaped member 10 moves further forward, the slope 53 pushes down the roller 33, and the roller 33
comes off from the groove 16 and enters the opening 30. As a result, the wedge-shaped member 10 presses down the pressing member 9, the supporting square springs 28, 28 are compressed, and the pressing part 6 presses the clamping edge 17 in a direction perpendicular to the base surface 2. do. That is, the wedge-shaped member 10
Due to the wedge action, the mold 18 is fixed with a clamping force greater than the force pressing the piston 20 with the pressure oil. Further, the state in which the pressing part 6 presses the clamping edge 17 is a state in which a wedge is driven between the pressing member 9 and the upper inner surface of the through hole 4, so even if the hydraulic pressure in the direction B shown in the figure disappears, The clamping action described above is maintained. This is because the push-up force _Y2 , which is a reaction force to the force applied in the _Y1 direction in the figure, generates a large frictional force on the contact surface between the upper surface of the wedge-shaped member 10 and the upper inner surface of the through hole 4, and on the other hand, the wedge-shaped Only a minute force is applied in the moving direction to move the member 10 backward. Therefore, the wedge-shaped member 10 stops at the above-mentioned clamped position, and the pressing member 9 also holds the mold 18 as it is. Note that when the clamp is released, pressure oil is supplied from the first supply/discharge port 41 and the wedge-shaped member 10 retreats as the piston 20 retreats via the second piston 24, thereby pressing against the slope 53 of the wedge-shaped member 10. The member 9 moves in a direction that creates a gap between it and the pressure-receiving surface 54, and the two square springs 28, 28 provided on the lower surface 7 of the pressing member 9 expand by the amount of this gap, causing the pressing member 9 to move toward the base surface. 2, and the pressing part 6 also separates from the clamping edge 17. When the wedge-shaped member 10 further retreats, the pressure receiving surface 5
4 engages with the groove 16 of the slope 53, and as the wedge-shaped member 10 retreats, the pressing member 9 also moves within the through-hole. Here, when the roller 33 comes off to the right from the groove 16 during the retreating process of the wedge-shaped member 10, the pin 39 engages with the inner end of the groove 40 provided in the pressure receiving surface 54 of the pressing member 9, and the pressing force is applied. The member 9 is forcibly returned to the retreating side and prevented from slipping out to the outside of the through hole 4.

In this embodiment, the wedge-shaped member 10 is moved forward by the drive unit 12 along with the pressing member 9 halfway through the forward movement, and from that point on, only the wedge-shaped member 10 is advanced, and the drive unit 12 moves the wedge-shaped member 10 backward. A roller 33 supported by a square spring 31 in an opening 30 formed in a pressure receiving surface 54 of the pressing member 9 and an inclined surface 53 of the wedge-shaped member 10 are moved back along with the pressing member 9 from the middle. Although the recessed groove 16 is provided in the groove 16, other means may be used instead. For example, the left end of the pressing member 9 and the rod may be pressed so as to press the pressing member 9 from the retracted position to the protruding position where it contacts the stopper 15. A compression spring is provided in the groove 51 between the groove 51 and the member 56 provided with the support hole 34 passing through, and the existing pin 39 causes the wedge-shaped member 10 to retreat along with the pressing member 9 from the middle of its retreat. The effects shown in the examples can be achieved.

Separately, pulling out the wedge generally requires a force greater than the force applied when pushing it in, but in this embodiment, the drive unit 12 has a backward drive force greater than the forward drive force, so there is no problem. do not have.

The above clamping device has a height of 110 mm from the base surface.
It can be formed to a diameter of about 1.5 mm, and a clamping force of approximately 4 tons can be obtained with a hydraulic pressure of 140 Kg/cm ² .

<Effects of the invention> According to the invention, the pressing member moves forward and is locked, and then vertically displaces toward the base surface, and the wedge-shaped member always has its slope as the pressure-receiving surface of the pressing member. Since surface contact is maintained, if the clamping edge has a thickness within a predetermined range, the mold can always be clamped with a constant clamping force due to the wedge action.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the position of the pressing member in the through hole of the clamp device of the present invention, Fig. 2 is a front view showing the vicinity of the protruding position in the working state of the same embodiment, and Fig. 3 is the same as Fig. 2. FIG. 4 is a side view of the clamping device shown in FIG. 2, and FIG. 4 is a plan view of the clamping device shown in FIG. 2...Base surface, 3...Main body, 4...Through hole, 6
... Pressing part, 9 ... Pressing member, 10 ... Wedge-shaped member, 12 ... Advance/retreat drive section, 15 ... Stopper, 1
6... Concave groove, 18... Mold, 27, 27... Opening (lower surface side of pressing member), 28, 28... Square spring (opening 27, 27), 29, 29... Trochanter (opening) hole 27,
27), 30... Opening (pressure receiving surface side), 31... Square spring (opening 30), 33... Roller, 53... Slope, 54... Pressure receiving surface.

Claims (1)

[Scope of utility model registration request] A main body fixed to a predetermined base surface and having a through hole extending in a direction substantially along the base surface; a wedge-shaped member that is housed on the base side and has a slope that gradually approaches the front end in the advancing and retreating direction with respect to the opposite surface thereof; an advancing and retreating drive unit that is connected to the rear end of the wedge-shaped member; and the through hole. The wedge-shaped member is housed on the base side of the wedge member so that it can move forward and backward in the direction of the through hole, and has a pressure receiving surface consisting of a slope in contact with the slope, and the tip of the base side surface is formed as a pressing part, and the pressing part a pressing member having a plurality of trochanters that protrude rearward from the part toward the base and are supported via springs so as to come into contact with the inner surface of the through hole; A clamping device comprising an interlocking means provided so that only the wedge-shaped member moves forward along with the movement, and that the wedge-shaped member moves back together with the pressing member from the middle of the retreat of the wedge-shaped member by the drive unit.