JPH0642969B2 - Clamp device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clamp device used when an injection molding machine, a mold for a press occasion, or the like is clamped in a used state.

<Prior Art> Examples of conventional clamp devices include Japanese Patent Publication No. 58-29184,
There is one disclosed in Japanese Utility Model Publication No. 60-37137. Japanese Patent Publication 58-2
The mold clamping device in No. 9184 is assembled with a pair of frames fixed to the front surface side of the mold mounting board as a reference. A presser pawl is provided between the pair of frames in a rotatable state about a rotary shaft that is laid horizontally. The tip of the presser pawl is a pressing head that presses the flange of the mold, and the lower surface of the rear end is an inclined surface. A wedge member is slidably arranged between the pair of frame bodies on the rear side of the presser pawl, and an upper surface thereof is an inclined surface. By moving the inclined surface of the wedge member between the inclined surface of the pressing claw and the mold mounting board, the wedge effect is exerted or eliminated by the action of the two inclined surfaces to clamp the mold. It is for unclamping. In the unclamped state, the pressing head of the presser pawl is rotated in a direction away from the flange portion of the mold by retracting the rod connected to the upper surface of the presser pawl.

The clamp device of Japanese Utility Model Publication No. 60-37137 is mainly composed of a piston body that fits inside a cylinder and a shaft body located in the cylinder axial direction in front of the piston body. The slanted surface at the lower part of the front of the body and the lower surface of the rear end of the shaft are slidably coupled, and further, the front part of the shaft is slidably abutted on a fulcrum shaft pivotally supported by the cylinder, and the push-up located in front of the shaft The shaft is always biased upward by the pin, and when the piston body pushes the shaft body forward, the tip of the shaft body contacts the mold side and the movement of the shaft body stops, and when the piston body is further advanced. The lower surface of the tip of the shaft body presses the clamping edge of the mold.

<Problems to be Solved by the Invention> In Japanese Patent Publication No. 58-29184 of the above-mentioned conventional clamp device, the structure is such that the rod is provided on the upper side of the drive device so that the holding claw rotates, so that the clamp device can be mounted on the board surface. When the height of the clamp device is high and the clamps are fixed to the respective board surfaces with a pair of molds sandwiched between the opposing board surfaces, the height of the clamp device is greater than the mold thickness. There is a problem that it can not be used if it is too high.In Japanese Utility Model Publication No. 60-37137, after the piston body moves forward until the tip of the shaft contacts the mold, the shaft presses the clamping edge. Therefore, there is a problem that such a die cannot be fixed in a flat die or a die having a wide clamp edge because there is no surface with which the tip of the shaft abuts.

<Means for Solving the Problems> A first invention is to fix a predetermined base surface to a main body having a through hole in a direction substantially along the base surface, and to allow the forward and backward movement in the through hole in the direction of the through hole. In addition, one end portion in the direction along the through hole is formed in the drive portion coupling portion and the other end portion is formed in the pressing portion, and one end portion in the direction along the through hole is formed in the pressing portion. A pressing member formed by a wedge-shaped portion in which a first surface on the surface side and a second surface on the opposite side gradually approach each other toward the pressing portion side, and the pressing member is provided at the through-hole position and the above-mentioned inside position. An advancing / retracting drive part connected to the drive part coupling part so as to advance and retreat along the through hole at a protruding position where the pressing part protrudes from the through hole, and the protruding part provided on the inner surface of the through hole and located near the protruding position. A first fulcrum part that is in contact with the first surface of the pressing member, and the first fulcrum part A second fulcrum portion projecting on the inner surface of the through hole so as to abut the second surface of the pressing member in the vicinity of the projecting position at a position farther from the driving portion side than the first fulcrum portion. Also comprises a spring provided in the main body so that the drive member side presses the pressing member toward the base surface side.

A second invention is a main body having a through hole fixed to a predetermined base surface and having a direction substantially along the base surface, and a body capable of advancing and retracting in the direction of the through hole in the through hole and in a direction perpendicular to the base surface. One end in the direction along the through hole that is accommodated so as to be displaceable is formed in the drive part coupling part, and the base surface side of the other end is formed in the pressing part. The second surface on the side of the pressing member is formed in a wedge-shaped portion gradually approaching each other toward the pressing portion, and the pressing member is located in the through hole and the protruding position where the pressing portion projects from the through hole. And an advancing / retreating drive part connected to the driving part coupling part so as to advance / retreat along the through hole, and abutting on the first surface of the pressing member protruding from the inner surface of the through hole and in the vicinity of the protruding position. The first fulcrum part and the position farther from the drive unit side than the first fulcrum part A second fulcrum portion projecting on the inner surface of the through hole so as to come into contact with the second surface of the pressing member in the vicinity of the protruding position, and a position facing the tip of the pressing member at the inner position of the through hole. From the position where the second pressing member abuts against the pressing portion, the second pressing member is rotatably provided at a position where the pressing member is brought into contact with the pressing portion of the pressing member in the vicinity of the protruding position by the forward movement of the pressing member. The second body and the second body are urged so as to urge them toward a position facing the tip of the pressing member.
And a spring provided between the pressing member and the pressing member.

<Operation> When the die is clamped by the means of the first invention, the drive portion advances the wedge-shaped pressing member from the position in the through hole to the projecting position, so that the pressing member causes the pressing member to move to the second position. Upon receiving a reaction force from the fulcrum portion toward the base surface side and an opposite reaction force from the first fulcrum portion, the pressing portion is rotated toward the base surface side. By this rotation, the pressing portion on the lower surface of the tip of the pressing member presses the clamp edge of the mold to bring the mold into a clamped state. When the mold clamp state is released, the drive portion retracts the pressing member from the projecting position to the position in the through hole, so that the rotating action of the pressing member in the direction opposite to the rotating direction of the pressing member during the forward movement is spring-loaded. Since the width of the wedge-shaped portion contacting between the first fulcrum portion and the second fulcrum portion becomes narrower as the retreat, the pressing portion is rotated in the opposite direction, and the pressing portion is for clamping the mold. Retreat away from the edge.

When clamping the mold by the means of the second invention,
While the pressing member in the means of the invention is similarly clamped, the second pressing member facing the tip of the pressing member is pushed by the tip of the pressing member to rotate and come into contact with the pressing portion. As a result, the mold is clamped by being positioned between the clamping edge of the mold and the pressing portion. When the last pressing member is slightly advanced, the pressing portion, the second pressing member, and the clamp edge are in contact with each other in sequence, and slippage occurs between the contact surfaces of the pressing portion and the second pressing member. . This slip has nothing to do with the mold side, and only the pressing action is transmitted.

<Example> A first example will be described with reference to FIGS. 1 to 4. This embodiment corresponds to the first invention and is shown in FIGS.
Forward / backward drive unit consisting of a single cylinder mechanism as shown
It is a clamp device for fixing the mold 18 to the base surface 2 by 12. The main body 3 has a tubular shape with a substantially square outer shape, and a circular through hole 4 is fixed to the base surface 2 in a direction along the base surface 2. A pressing member 9 is provided inside the main body 3.

The pressing member 9 is a wedge-shaped member that is movable in the through hole 4 in the penetrating direction, has a first surface 7 on the side of the base surface 2 and a second surface 8 on the opposite side, and is on the side of the mold 18. And the inclination angle a is about 10 degrees. The other two surfaces of the pressing member 9 facing the inside of the main body 3 are formed in parallel. One end of the pressing member 9 along the through hole 4 on the side of the mold 18 is formed with a convex pressing portion 6, and the other end is engaged with the tip portion 21a of the rod 21 of the piston 20 of the cylinder mechanism. It is formed in the drive part coupling part 5 which can be fitted. This pressing member 9 can move following the forward / backward movement of the piston 20,
Further, the pressing member 9 is engaged with the tip end portion 21a of the piston rod 21 so that it can be slightly moved up and down in FIG.

The advancing / retreating drive unit 12 drives the piston 20 fitted in the cylinder 19 by the pressure oil, and as shown in FIG. 1, a distal end portion 21a formed as an enlarged portion at the right end of the rod 21 on the right side of the piston 20. Is connected to the drive part connecting part 5, and the piston 20 is slidable along the inner peripheral surface of an annular block 22 fixed inside the connecting part of the cylinder 19 and the main body 3, and the piston 20 in the drawing of FIG. Disc-shaped retaining part on the left end
An annular second piston 24 is provided between the retaining portion 23 and the annular block 22, and the outer peripheral surface of the second piston 24 abuts the inner peripheral surface 25 of the cylinder 19. The inner peripheral surface of the second piston 24 is in contact with the outer peripheral surface 26 of the piston 20 so that it can slide. On the side surface of the cylinder 19, the fourth
As shown in the figure, pressure oil supply / discharge ports 41, 42 are provided. First
Supply / discharge port 41 communicates with a chamber 19a formed at the right end position in the cylinder 19, that is, a position where the annular block 22 and the second piston 24 contact each other, and the second supply / discharge port 42 has the left end inside the cylinder 19. It is provided so as to communicate with the position. Piston 20 above
A piston rod 28 is separately formed at the end of the retaining portion 23 on the side thereof.

The rod 28 penetrates the left end wall of the cylinder 19 and projects to the outside, and the tip end of the rod 28 has a disc-shaped sensed member 30.
Is provided. Inside the cover 31 which covers the tip of the rod, when the piston 20 moves forward to the right or moves backward to the left, the detected member is located at the corresponding moving position of the detected member 30. Proximity switch to sense
There are 32 and 32.

The structure of the piston 20 and the second piston 24 is the piston
The force by which the pushing member 9 pushes the pressing member 9 toward the protruding position side is smaller than the force by which the second piston 24 pulls the pressing member 9 back toward the through hole inner position side. This is a wedge-shaped pressing member 9
Is designed such that it can be removed even if it is caught between the clamping edge portion 17 of the die and the first fulcrum portion 14 and the second fulcrum portion 15.

The first fulcrum portion 14 is provided so as to come into contact with the first surface 7 of the pressing member 9 at a predetermined position in the longitudinal direction of the through hole 4. The first fulcrum portion 14 rotatably supports a cylindrical shaft in a circular hole 35 formed in the main body 3 across a position offset to the base surface 2 side of the through hole 4, and the shaft is attached to the shaft. A groove 33 having a rectangular cross section, which is slightly shallower than the radius, is formed. The first surface of the pressing member 9 and the other two surfaces perpendicular to the first surface are fitted in the groove 33, and the pressing member 9 is movable along the groove 33 in the direction of the through hole 4. .

The second fulcrum portion 15 has a shape substantially similar to that of the first fulcrum portion 14, and its position is on the side contacting the second surface 8 of the pressing member 9 and slightly closer to the mold 18 side than the first fulcrum portion 14. It is provided at the position. Second
The fulcrum portion 15 has the same configuration as the first fulcrum portion 14 and has a circular hole 36 supporting a cylindrical shaft, and the shaft is provided with a groove 3 having a rectangular cross section. The second surface and the other two surfaces perpendicular to the second surface are fitted to each other so that the pressing member 9 can be moved in the penetrating direction along the groove 34.

The spring 16 is accommodated in a spring accommodating portion 39 screwed to the side wall of the main body 3 on which the second fulcrum portion 15 is provided. The spring accommodating portion 39 is open inside the main body and contacts the pressing member 9. A push-down pin 40 is provided at the lower end, and this spring is used as a pressing member 9.
Is pressed toward the base surface 2 side. The position of the spring 16 is closer to the drive unit 12 than the first fulcrum portion 14.

Reference numeral 51 in FIG. 3 denotes a set screw for locking the axial movement of the shaft forming the second fulcrum portion 15.

The above clamp device is attached to the base surface 2 as shown in FIG. 1, and when the mold 18 is not clamped, the pressing member 9 is located inside the through hole 4 inside the main body 3. Spring
Since 16 is pressing the second surface 8 of the pressing member 9, the pressing portion 6 is located slightly above the clamping edge 17 of the mold 18. When the mold 18 is clamped, as shown in FIG. 2, pressure oil is supplied to the rear surface of the piston to operate the drive unit 12. The pressing member 9 advances with the first surface 7 guided by the first fulcrum portion 14 and the second surface 8 similarly guided by the second fulcrum portion 15. With this forward movement, the pressing portion 6 at the tip of the pressing member moves in the Y ₁ direction and presses the clamping edge portion 17 of the mold 18. That is, the wedge action of the pressing member 9 fixes the mold with a clamping force larger than the force of pressing the piston 20 with the pressure oil. Further, in the state where the pressing portion 6 presses the clamping edge portion 17, the wedge is driven between the first fulcrum portion and the clamping edge portion and the second fulcrum portion, so that the hydraulic pressure in the B direction shown in the figure disappears. Even so, the above clamping action is maintained as it is. This is because a pushing-up component force Y ₂ which is a reaction force of the force applied in the Y ₁ direction in the figure causes a large frictional force on the contact surface between the second surface 8 of the pressing member 9 and the second fulcrum portion 15, and A component force in the moving direction for retracting the member 9 applies only a small force. Therefore, the pressing member 9 stops at the above-mentioned clamped position and holds the mold 18 as it is. When the clamp is released, pressure oil is supplied from the first supply / discharge port 41 and the piston
With the retreat of 20, the pressing member 9 also retracts to the position in the through hole, and the pressing portion 6 also separates from the clamping edge portion 17. Generally, in order to pull out the wedge, an acting force which is larger than an acting force at the time of pushing is often required, but in this embodiment, since the backward driving force is set larger than the forward driving force in the driving portion, there is no problem.

A second embodiment will be described with reference to FIGS. 5 to 7. This embodiment corresponds to the second invention and is different from the first embodiment in that the spring 16 for pressing the pressing member 9 to the base surface 2 side in the first embodiment is omitted, A groove 43 having a rectangular cross section is provided on the base surface 2 side of the mold 18 in a direction perpendicular to the base surface, and a second pressing member 45 and a spring 46 are provided in the groove 43.
The position of the proximity switch 32 is moved from the rear portion of the main body to the side surface portion of the main body as shown in FIG. 7, and the rod 28 and the sensed member 30 of the first embodiment are omitted and the driving portion coupling portion 5 of the pressing member 9 is omitted. That is, the sensed portion 49 protruding is provided in the vicinity. Since the other parts are the same, the same parts are designated by the same reference numerals and the description of those parts is omitted.

The second pressing member 45 will be described with reference to the diagram of the position in the through hole shown by the phantom line in FIG. 5. The pressing head 47 is provided on the upper end of the second pressing member 45 facing the end of the pressing member 9 on the mold 18 side. The pressing head 47 is formed such that the surface in contact with the end of the pressing member is convex and the surface on the opposite side facing the mold is also convex.
A shaft 44 serving as the center of rotation of the second pressing member 45 is provided below the pressing head 47, and the lower portion of the second pressing member 45 and the shaft are provided.
The reference numeral 44 is fitted in the groove 43 provided in the main body 3, and the second pressing member 45 is configured to be rotatable along the surface of the main body in the penetrating direction. A spring 465 is provided on the shaft 44, and the second pressing member 45 contacts the pressing member 6 from the position where the second pressing member 45 contacts the pressing member 6.
Is urged toward the position facing the tip of the. Reference numeral 50 in the figure is a retaining pin of the spring.

The movement of the pressing member 9 from the position inside the through hole to the clamped state shown by the solid line in the figure will be described. The pressing head 47 facing the tip of the pressing member 9 is pressed by the tip of the pressing member 9 and pressed. It is rotated to a position where it abuts against the portion 6, and the pressing head 47 and the clamping edge portion 17 of the mold are sandwiched between the pressing portion 6 and the base surface 2 to be in a clamped state. The operation of the pressing portion 6 immediately before the mold is clamped is such that the pressing head 47 is pushed down in a direction substantially perpendicular to the base surface 2 about the rotation shaft 44 by moving in the front obliquely downward direction. Rotate to. According to this clamping action, the pressing head 47 presses the clamping edge portion 17 in the direction perpendicular to the base surface 2, so that the mold 18 does not shift from the fixed position on the base surface, and the desired position is obtained. Can be securely fixed to.

The height from the base surface of the clamp device of the first and second embodiments can be formed to about 50 mm, and the hydraulic pressure of 210 kg / cm ² is about 900 kg.
Clamping force of is obtained. With a clamp device with a height of 50 mm, the thickness of the mold sandwiched between the two board surfaces can be reduced to about 120 mm.

<Effects of the Invention> According to the present invention, the pressing member is a wedge-shaped member that is provided in the cylindrical main body parallel to the base surface and is driven forward and backward in the axial direction of the main body. Since parallel hydraulic cylinders can be used, the entire structure can be formed into a thin structure. This is extremely advantageous when fixing a pair of thin molds to the respective base surfaces while sandwiching them between the base surfaces facing each other. Also, the shape of the clamp edge of the die may be a plane that is substantially parallel to the base surface, and compared to the conventional shaft body that abuts the die in front and displaces vertically, There is an effect that there are few restrictions in that it is not necessary.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a position in a through hole of a pressing member according to a first embodiment of the present invention, FIG. 2 is a view showing a vicinity of a projecting position in an operating state of the same embodiment, and FIG. FIG. 4 is a side view of the clamp device shown in FIG. 4, FIG. 4 is a plan view of the clamp device shown in FIG. 2, FIG. 5 is a view showing the vicinity of the projecting position in the working state of the second embodiment, and FIG. FIG. 7 is a side view of the clamp device shown in FIG. 7, and FIG. 7 is a plan view of the clamp device shown in FIG. 2 ... Base surface, 3 ... Main body, 4 ... Through hole, 6 ... Pressing part, 7 ... First surface, 8 ... Second surface, 9 ... Pressing member, 12 ... Forward / backward drive Part, 14 ... First fulcrum part, 15 ... Second
A fulcrum, 18 ... Mold, 45 ... Second pressing member, 47 ... Pressing head.

Claims (2)

[Claims] 1. A main body which is fixed to a predetermined base surface and has a through hole extending in a direction substantially along the base surface, and a body which can move forward and backward in the direction of the through hole and is perpendicular to the base surface. One end in the direction along the through hole that is accommodated so as to be displaceable is formed in the drive part coupling part, and the base surface side of the other end is formed in the pressing part. The second surface on the side of the pressing member is formed in a wedge-shaped portion gradually approaching each other toward the pressing portion, and the pressing member is located in the through hole and the protruding position where the pressing portion projects from the through hole. And an advancing / retreating drive part connected to the driving part coupling part so as to advance / retreat along the through hole, and abutting on the first surface of the pressing member protruding from the inner surface of the through hole and in the vicinity of the protruding position. The first fulcrum part and the position farther from the drive unit side than the first fulcrum part And a second fulcrum portion projecting on the inner surface of the through hole so as to abut the second surface of the pressing member in the vicinity of the protruding position, and the pressing member on the drive portion side with respect to the first fulcrum portion. A clamp device comprising a spring provided on the main body so as to press the base surface side. 2. A main body which is fixed to a predetermined base surface and has a through hole extending in a direction substantially along the base surface, and a body which can be moved forward and backward in the direction of the through hole and is perpendicular to the base surface. One end in the direction along the through hole that is accommodated so as to be displaceable is formed in the drive part coupling part, and the base surface side of the other end is formed in the pressing part. The second surface on the side of the pressing member is formed in a wedge-shaped portion gradually approaching each other toward the pressing portion, and the pressing member is located in the through hole and the protruding position where the pressing portion projects from the through hole. And an advancing / retreating drive part connected to the driving part coupling part so as to advance / retreat along the through hole, and abutting on the first surface of the pressing member protruding from the inner surface of the through hole and in the vicinity of the protruding position. The first fulcrum part and the position farther from the drive unit side than the first fulcrum part A second fulcrum portion projecting on the inner surface of the through hole so as to come into contact with the second surface of the pressing member in the vicinity of the protruding position, and a position facing the tip of the pressing member at the inner position of the through hole. From the position where the second pressing member abuts against the pressing portion, the second pressing member is rotatably provided at a position where the pressing member is brought into contact with the pressing portion of the pressing member in the vicinity of the protruding position by the forward movement of the pressing member. The second body and the second body are urged so as to urge them toward a position facing the tip of the pressing member.
A clamping device comprising a spring provided between the pressing member and the pressing member.