JPH0715315U - Wedge type clamp device - Google Patents

Abstract

(57) [Summary] [Purpose] The driving force of the advancing / retreating drive unit required to release the clamped state is reduced, and even when the driving force disappears in the clamped state, the clamping force does not decrease, and the structure is To reduce the number of parts. A through-hole attached to a base surface 16 for fixing a mold 17 and gradually approaching the base surface 16 toward the mold 17 and forming a predetermined angle α (= 9 °) with the base surface 16. A body portion 11 having a pressing portion 18 and a pressing portion 18 formed on a surface of the tip end portion, which is housed in the through hole 14 so as to be capable of advancing and retreating in the direction of the through hole 14 and faces the mold 17, on the base surface 16 side. The metal fitting 12 and the advancing / retreating drive portion 13 connected to the rear end portion of the pressing metal fitting 12 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wedge type clamping device used for clamping a die of an injection molding machine or a press machine in a used state, or for clamping a machined work on a base surface such as a table.

[0002]

[Prior art]

 There is a conventional clamp device in which the clamp metal fittings are driven by a wedge.According to this, since the frictional resistance of the wedge is large, it has the advantage that it does not loosen even if the drive force of the wedge is removed. There is a problem that the drive unit needs a large capacity. Therefore, it has become possible to consider a structure in which a roller is interposed between the wedge and the other side in contact with the wedge.

As a conventional equivalent to this type, there is one described in Japanese Utility Model Publication No. 58-15077. In this clamper, a clamp arm 1 is swingably supported by a main body 2 on a fulcrum shaft 3, a double-acting hydraulic cylinder 4 is provided on the main body 2, and the clamp arm 1 is connected to a cam transmission 5 by the hydraulic cylinder 4. It is designed to be driven through. The cam type transmission device 5 includes a driving curved surface cam 7 connected to a piston rod 6 of a hydraulic cylinder 4, a driven roller 8 provided on the clamp arm 1 in contact with the driving curved surface cam 7, an opposite surface of the driving curved surface cam 7, and a main body. 2 and the idler roller 9 interposed between the two. Further, the double-acting hydraulic cylinder 4 is provided with a clamp retaining compression spring 10 for outputting an acting force in the acting direction of the clamp.

According to the above conventional clamper, since the clamp holding compression spring 10 is provided, it is possible to prevent the clamp force from decreasing even when the driving force of the hydraulic cylinder 4 decreases, and the driving curved cam Since 7 moves within the driven roller 8 and the idler roller 9, the hydraulic cylinder 4 having a relatively small driving force can be used.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional clamper, in order to reduce the contact resistance between the driving curved surface cam 7 functioning as a wedge and the clamp arm 1 that comes into contact with the driving curved surface cam 7, the driven roller 8 and the idle roller 8 9 is required, and the clamp holding compression spring 10 is required to prevent the clamp force from decreasing when the hydraulic pressure decreases. Therefore, since the structure becomes complicated and the number of parts increases, the processing cost and the material cost increase, and it takes a lot of time and labor to assemble the clamper.

In the conventional clamper described above, the clamp arm 1 is attached to the main body 2 as a fulcrum shaft as a means for converting the driving force of the driving curved surface cam 7 (wedge) into a tightening force for tightening a tool or the like on the mounting base. Since the structure in which the clamper 3 is swingably supported is adopted, and since this structure is required, there is a problem that the volume of the clamper is correspondingly increased. Further, since the clamp arm 1 and the like are required, there is a problem that the number of parts is increased and the cost is increased accordingly.

An object of the present invention is to provide a wedge type clamp device having a simple structure and a small number of parts while retaining the advantages of the conventional clamper.

[0008]

[Means for Solving the Problems]

 The wedge type clamp device of the first invention is attached to a base surface for fixing a clamped article such as a mold or a workpiece, and gradually approaches the base surface as it approaches the clamped article, A body portion having a through hole in a direction forming a predetermined angle, and a pressing portion on a base surface side surface of a tip end portion which is housed in the through hole so as to be capable of advancing and retreating in the direction of the through hole and which faces the clamped article. And a forward / backward drive unit that is connected to the rear end of the pressing member.

A wedge type clamp device according to a second aspect of the present invention is the wedge type clamp device according to the first aspect, wherein the advancing / retreating drive unit is connected to the cylinder body and the rear end portion of the pressing fitting. A rod provided on the cylinder body so as to be able to move forward and backward in a direction substantially parallel to the through hole of the portion, and a rod provided on the rod so as to be slidable within a predetermined range along the rod. The rod can be moved forward within the predetermined range and in this state the rod can be moved forward, and the rod is moved to the retracted position within the predetermined range by the driving force in the direction opposite to the direction of the predetermined driving force. In this state, the piston is configured so that the rod can be moved backward and backward.

[0010]

[Action]

 According to the present invention, the pressing metal fitting is moved forward by the action of the advancing / retreating drive part, whereby the pressing metal fitting is advanced along the through hole of the main body. Since the through-hole is provided in a direction that gradually approaches the base surface as it faces the object to be clamped, the pressing portion provided at the tip of the press fitting gradually increases the base surface, that is, the pressed portion of the object to be clamped. And then comes into contact with the pressed portion, and the pressed portion can be clamped to the base surface. Then, by pushing the metal fitting backward by the action of the advancing / retreating drive section, the pressing section is separated from the pressed section of the clamped article, whereby the unclamped state can be achieved.

According to the advancing / retreating drive unit of the second invention, the piston moves toward the forward movement position side along the rod by the predetermined driving force. Then, since the piston moves to the forward position, the rod also moves forward with the piston. When the rod moves forward, the pressing fitting also moves forward, and the pressing portion enters a clamped state in which the pressed portion is tightened on the base surface. In the clamped state, when the driving force in the direction opposite to the predetermined driving force is applied to the piston, the piston moves from the forward movement position toward the backward movement position. When the piston moves backward at a certain speed and moves to the retracted position, the rod is moved backward by the resultant force of the speed energy of the piston and the driving force in the opposite direction. When the rod moves backward, the clamped state is changed to the unclamped state.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In the figure, 11 is a main body part, 12 is a pressing metal fitting, and 13 is a forward / backward drive part. The clamping device of this embodiment relates to a molding machine for molding foamed plastic such as expanded polystyrene, and is used for fixing a molding die. However, this clamping device is not limited to the purpose of fixing this molding die only, but it should be used for other purposes, for example, for fixing a workpiece etc. to a predetermined base surface. You can

As shown in FIG. 1, the main body portion 11 is a block-shaped body having a through hole 14 having a constant inner diameter, that is, a circular hole, and is formed by a bolt 15 (see FIGS. 1 and 2). It is fixed to the surface 16. The direction of the through hole 14 gradually approaches the base surface 16 toward the mold 17 as the article to be clamped, and forms a predetermined angle α (= 9 °) with the base surface 16.

As shown in FIG. 1, the pressing fitting 12 is a cylindrical body housed in the through hole 14, and is provided slidably along the through hole 14. The right end in the figure projects from the right opening of the through hole 14, the lower side of this projection is the pressing portion 18, and its left rear end projects from the left opening of the through hole 14. ing.

As shown in FIG. 1, the advancing / retreating drive unit 13 is formed of a double-acting air cylinder, and has a cylinder body 19, a piston 20, and a rod 21, and as shown in FIG. Is connected to the left side surface of the main body 11. The rod 21 has its right end portion in FIG. 1 fitted and coupled to the rear end portion of the pressing fitting 12, and is fixed by a connecting pin 22. The left rear end portion of the rod 21 is inserted into a through hole 24 formed in the bottom wall 23 of the cylinder body 19 and projects outward. As a result, the rod 21 can slide forward and backward together with the pressing member 12 along the through holes 14 and 24. Moreover, as shown in FIG. 1, an annular projection 25 is provided at the center of the rod 21.

As shown in FIG. 1, the piston 20 is an annular block, and a rod 21 is inserted through an inner hole 26, which is slidable along the rod 21 and a cylinder. It is provided slidably in the cylinder direction along the inner surface of the main body 19. However, the range in which the piston 20 can slide along the rod 21 is as shown in FIG. 2 from the forward position where it comes into contact with the step 27 formed by the rear end of the pressing tool 12, as shown in FIG. In addition, it is a range up to the retracted position where it abuts against the right side surface of the protrusion 25.

Reference numerals 28 and 29 shown in FIG. 1 denote compressed air supply / discharge ports. 30 is a cushioning member having elastic properties such as urethane rubber. The cushioning member 30 is provided so as not to directly collide with the bottom wall 23 of the cylinder body 19 when the piston 20 moves to the rearward retracted position, and is for cushioning the impact. Reference numeral 32 is an unclamp position detection switch, and 33 is a clamp position detection switch. And 34 is a switch operation part. The switch actuating portion 34 is provided at the rear end portion of the rod 21 and turns on the clamp position detection switch 33 when the pressing fitting 12 is moving to the clamp position shown in FIG. Then, the unclamp position detection switch 32 is turned ON while the pressing metal fitting 12 is moving to the unclamp position (not shown) (see the chain double-dashed line in FIG. 1). When the pressing metal fitting 12 is neither in the clamp position nor in the unclamp position, both the unclamp position detection switch 32 and the clamp position detection switch 33 are OFF. Further, 38 is a rotation preventing plate for the rod 21 and the pressing fitting 12, which is fixed to the bottom lid 23. A guide surface is formed on each side surface of the rod 21 and the switch operating portion 34, and the guide surface slides along the rotation stop plate 38, so that the rod 21 and the switch operating portion 34 do not rotate. I stopped at.

The wedge type clamp device configured as described above is in the clamped state in the state of FIG. 1, and the pressing portion 18 of the pressing metal member 12 presses the upper surface of the pressed portion 35 of the mold 17, whereby the mold 17 is clamped to the base surface 16.

When the clamped state shown in FIG. 1 is changed to the unclamped state, compressed air is supplied from the supply / discharge port 29 into the room 36, and compressed air in the room 37 is discharged from the supply / discharge port 28. At this time, first, the piston 20 at the forward position shown in FIG. 1 moves along the rod 21 toward the backward position (leftward in FIG. 1). Then, when the piston 20 that moves backward at a certain speed collides with the protrusion 25 (see FIG. 2), an impact force based on the resultant force of the velocity energy of the piston 20 and the pressure of the compressed air is applied to the rod 21. The pressing member 12 is disengaged from the pressed portion 35 by the impact force. When the pressing metal fitting 12 is disengaged from the pressed portion 35, the piston 20 is moved backward by the pressure of the compressed air supplied to the chamber 36 while the piston 20 is engaged with the protrusion 25, whereby the rod 21 and the pressing metal fitting 12 are moved. It moves backward and becomes an unclamped state (not shown).

In other words, the pressure fitting 12 in the clamped state is removed from the pressed portion 35 by the impact force based on the resultant force of the velocity energy of the piston 20 and the pressure of the compressed air. The effective area of the piston 20 which receives the pressure of the compressed air can be reduced as compared with the structure in which the piston 20 is moved backward by only the above and the pressing metal fitting 12 in the clamped state is removed from the pressed portion 35. As a result, the size of the entire clamp device can be reduced.

Next, when the unclamped state is changed to the clamped state shown in FIG. 1, compressed air is supplied from the supply / discharge port 28 into the room 37, and the compressed air in the room 36 is supplied from the supply / discharge port 29. Discharge. At this time, first, the piston 20 in the retracted position moves toward the forward position along the rod 21. Then, the piston 20 moving forward at a certain speed collides with the step portion 27, and in a state where the piston 20 is engaged with the step portion 27, the pressure of the compressed air supplied to the chamber 37 causes the piston 20, the pressing metal fitting 12, and The rod 21 moves forward. When the pressing fitting 12 moves forward to a position where the pressing portion 18 of the pressing fitting 12 contacts the upper surface of the pressed portion 35, the pressing fitting 12, the piston 20 and the rod 21 stop advancing, and the clamped state is established. In this clamped state, even if the supply of compressed air from the supply / discharge port 28 is stopped, the force of the pressing portion 18 pressing the pressed portion 35 due to the frictional force between the pressing portion 18 and the pressed portion 35. Is hardly reduced, and thus the clamped state is maintained.

However, in the above embodiment, the advancing / retreating drive unit 13 is a double-acting air cylinder, but the invention is not limited to this, and a double-acting hydraulic cylinder can be used. In the case of the hydraulic type, in order to prevent the moving speed of the piston 20 from becoming slow, the inner diameters of the supply / discharge ports 28, 29 are made large so that the resistance when the pressure oil passes through the supply / discharge ports 28, 29. It is better to reduce.

In the above embodiment, the double-acting air cylinder is used as the advancing / retreating drive unit 13, but a single-acting air cylinder may be used instead of the double-acting air cylinder. In this case, the pressing metal fitting 12 can be moved forward by air pressure and the pressing metal fitting 12 can be retracted by a separate biasing means such as a spring, or the pressing metal fitting 12 can be moved by a separate biasing means such as a spring. Can be moved forward and the pressure fitting 12 can be moved backward by air pressure.

Further, in the above embodiment, the inclination angle α of the through hole 14 is set to 9 °, but the present invention is not limited to this. For example, the inclination angle is required so that a desired tightening force can be obtained. be able to.

Further, in the wedge type clamping device of the above-described embodiment, when the mold 17 is clamped, the pressing member 12 is moved to the right in FIG. 1 to move the mold 17 to the right along the base surface 16. Although it may be moved slightly, a protrusion (not shown) or the like can be provided on the base surface 16 in order to prevent the mold 17 from being displaced beyond such an allowable range. Further, instead of providing a protrusion on the base surface 16, a separate pressed portion 35 is provided on the right side of the mold 17 shown in FIG. A ramp device is provided, and this separate clamp device balances the force for moving the mold 17 to the left in FIG. 1 and the force for the clamp device shown in FIG. 1 to move the mold 17 to the right in FIG. Therefore, the mold 17 may be prevented from being displaced beyond the allowable range.

[0026]

[Effect of device]

 According to the present invention, the direction of the through-hole gradually approaches the base surface as it goes toward the clamped article such as a mold, and forms a predetermined angle with the base surface. When driven and moved forward along the through hole provided in the main body, the pressing fitting can directly clamp the article to be clamped to the base surface by the wedge force. Therefore, unlike the conventional clamper shown in FIG. 4, it is not necessary to provide the clamp arm 1 as a means for converting the driving force of the driving curved surface cam 7 into the tightening force for tightening the tool or the like on the mounting base. As a result, there is an effect that the bulk can be made smaller than that of the conventional clamper shown in FIG. Since the number of parts can be reduced by omitting the clamp arm 1, the cost can be reduced accordingly.

According to the second aspect of the invention, the pressing metal fitting that is clamping the article to be clamped is retracted by the resultant force (impact force) of the driving force of the advancing / retreating drive unit and the velocity energy of the piston, and the unclamping is performed. It is a configuration that can be put into a state. Therefore, the pressing fitting can be moved backward by a force larger than the predetermined driving force output by the advancing / retreating drive unit by the velocity energy of the piston. As a result, there is an effect that a forward / backward drive unit with a small driving force can be adopted as compared with the case where the pressing metal fitting is moved backward by only the predetermined driving force.

That is, in the conventional clamper shown in FIG. 4, in order to reduce the contact resistance between the driving curved surface cam 7 and the clamp arm 1, etc., the driven roller 8 and the idler roller 9 are provided. However, the driven roller 8 and the idler roller 9 are required. On the other hand, in the second invention, such driven roller 8 and idler roller 9 are unnecessary. The conventional clamper shown in FIG. 4 requires the clamp holding compression spring 10 in order to prevent the clamp force from decreasing when the hydraulic pressure decreases. On the other hand, in the second invention, such a clamp holding compression spring 10 is unnecessary. Therefore, according to the second invention, compared with the conventional clamper, the structure is simple and the number of parts is small, which can reduce the processing cost and the material cost, and shorten the assembly of the clamp device. The effect is that it can be done in time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a clamped state of a wedge type clamp device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a piston of the wedge type clamp device of the embodiment is moved to a retracted position.

FIG. 3 is a plan view of the wedge type clamp device of the embodiment.

FIG. 4 is a sectional view of a conventional clamper.

[Explanation of symbols]

 11 body part 12 pressing metal fitting 13 advancing / retreating drive part 14 through hole 16 base surface 17 mold 25 projecting part 27 step part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29C 45/64 7365-4F

Claims (2)

[Scope of utility model registration request] 1. A direction which is attached to a base surface for fixing a clamped article such as a mold or a workpiece and gradually approaches the base surface as it goes toward the clamped article and forms a predetermined angle with respect to the base surface. A body part having a through hole, and a pressing part formed on the base surface side surface of the tip end part which is housed in the through hole so as to be capable of advancing and retracting in the direction of the through hole and faces the clamped article. A wedge-type clamp device comprising: a metal fitting; and a forward / backward drive unit connected to a rear end portion of the pressing metal fitting. 2. The wedge type clamp device according to claim 1, wherein the advancing / retreating drive unit is connected to the cylinder body and the rear end portion of the pressing metal member and is advanced / retracted in a direction substantially parallel to a through hole of the body unit. A rod that is provided on the cylinder body as much as possible and a rod that is slidable within a predetermined range along the rod and is moved to a forward position within the predetermined range by a predetermined driving force. In this state, the rod can be moved forward, and by the driving force in the direction opposite to the direction of the predetermined driving force, the rod can be moved to the retracted position within the predetermined range and the rod can be moved backward in this state. A wedge-type clamp device, which is composed of a piston having a structure capable of being formed.