JPH01210131A - Clamping device - Google Patents

Abstract

PURPOSE:To simplify a clamping device in structure and to make it small in size by moving a clamping rod by fluid pressure to a base end side for clamping. CONSTITUTION:When pressure oil is supplied from an opening 54, a 1st piston 28 is backed to a lower side against a compression spring 19 of an action force generating means 4 as far as the position where the lower surface of the base part 12 of the clamping rod 2 comes into contact with the upper surface of an intermediate member 1. A rotatable clamping rod 2 is rotated 90 deg. by this movement toward the lower side of the 1st piston 28 and an engaging part 11 moves from an unclamped rotation position corresponding to a groove 16 to a clamped rotation position facing a part 10 to be clamped. When the engaging part 11 is as this clamped rotation position and pressure oil backs the 1st piston 28 from this forward position to a further lower side, the engaging part 11 comes into contact with the part 10 to be clamped of the die 9, press it to the upper surface of the base 6 and enters a clamping state which fixes the die 9.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is used, for example, when attaching a mold of an injection molding machine or a press machine to a base, etc., in which a clamp rod that acts as a clamp gets in the way of changing the mold. This invention relates to a clamp device that rotates around the central axis of a clamp rod to prevent

<Prior art> Conventional clamping devices of this type include, for example, the one disclosed in Japanese Patent Application Laid-Open No.
There is one disclosed in 120434 publication.

As shown in FIGS. 26 and 27, when clamping the mold 221 and the bolster 220 from the position where the head of the clamp rod 202 is retracted toward the bed 214, compressed air is supplied from the opening 201b. Supply and move the clamp rod 202 forward (leftward in Fig. 23)
let As a result, the spline shaft 203 also
When a contacts the ring 207, it moves forward. At this time, the head of the clamp rod 202 comes out above the mold 221. In this state, compressed air is supplied to the opening 219a to move the rack 205 and rotate the spline shaft 203 and clamp rod 202 by 90 degrees via the pinion 204. Next, pressure oil is supplied from the opening 216a to the cylinder 20.
1, the head of the clamp rod 202 is engaged with the mold 221, and the mold 221 and the bolster 22 are
0 to the bed 214. When the head of the clamp rod 202 is moved forward and then retreated toward the bed 214 after the mold 221 is clamped, the opening 216
Pressure oil is supplied to C to move the cylinder 201 forward and at the same time move the clamp rod 202 forward. At this forward position, compressed air is supplied to the opening 218a to move the rack 205 and rotate the spline shaft 203 and clamp rod 202 by 90 degrees via the pinion 204. Next, the opening 216b
compressed air is supplied to retract the clamp rod 202. At this time, the stepped portion 202a and the washer 206 come into contact with each other, so that the spline shaft 203 retreats.

The clamp is then released, and the head of the clamp rod 202 is housed in the bed 214.

In addition, a clamping device disclosed in Japanese Utility Model Application Publication No. 56-71324 has a cylinder head 1 as shown in FIG.
06, and a clamp rod 102 that is engaged with and guided by the pin 107 and provided with a J-shaped groove 102a on the outer periphery for turning 90 degrees as the clamp rod 102 moves up and down. There is. In this device, a pressure fluid drives a piston 104 provided at one end of the clamp rod 102, so that the clamp rod 102 is
02 moves back and forth, and as a result of this movement, the J-shaped groove 1028 provided in the clamp rod 102 moves along the pin 107 provided inside the cylinder 103, thereby driving the clamp rod 102 also in the turning direction. The stroke of the J-shaped groove 102a provided in this clamp rod 102 is
When the engaging part 102b of 02 comes into contact with the mold 101 and when it separates from the mold 101, the clamp rod 102 is connected to the straight part a to prevent the clamp rod 102 from rotating and shifting the position of the mold 101. Contains a curved section for rotation.

<Problems to be Solved by the Invention> The clamp rod rotation drive unit of the apparatus shown in FIGS. 26 and 27 has a configuration in which the rack is moved by compressed air to rotate the binion, the spline shaft, and the clamp rod. Therefore, the structure becomes complicated and the external size becomes large. Further, a drive unit for moving the rack is required separately from the drive unit for driving the clamp rod. For this reason, in applications where it is desired to make the clamp device as small as possible, this rotary drive section must be made small, but there is a problem that it cannot necessarily be made small enough. In addition, in the rotating drive part of the clamp rod of the device shown in FIG. 25, a pin provided inside the cylinder engages with a five-shaped groove provided at one end of the clamp rod, and the movement of the clamp rod back and forth causes the five-shaped groove to move. moves along the pin.

Since the clamp rod is configured to be rotationally driven, the stroke of the clamp rod requires a rotation stroke b for rotating the clamp rod in addition to a stroke a for loosening the engaging portion of the clamp rod from the mold.

For this reason, when removing the mold from the slide, it is easier to remove the groove of the mold from the tip of the clamp rod by preventing the tip of the clamp rod from protruding as much as possible below the mold as shown in Figure 25. There is a problem in that it is difficult to remove because it protrudes extra by the amount of stroke b. Further, the clamp rod of this clamp device is rotationally driven by engagement through line contact between the 5-shaped groove and the pin. Therefore, the contact pressure between the 5-shaped groove and the pin increases, and the pin must be formed to have a thickness corresponding to this contact pressure. The width of the 5-shaped groove becomes wider according to the thickness of this pin. As a result, the proximal end of the clamp rod, which has a 5-shaped groove, also becomes thicker, and the outer shape of the cylinder becomes thicker. Furthermore, since the proximal end portion provided with this 5-shaped groove becomes thicker, there is a problem in that the height of the cylinder needs to be increased in order to obtain a predetermined lead angle.

An object of the present invention is to provide a structure for rotating a clamp rod with a simpler structure without using a rack, pinion, or spline shaft, and a clamp device having a structure in which the clamp rod can omit the stroke b. Our goal is to provide the following.

<Means for Solving the Problems> The present invention provides a rotating clamp that includes a main body having an inner hole, an engaging portion at the tip, and rotates at a predetermined angle around a central axis so that the engaging portion faces the clamped portion. A clamp rod, which is provided so as to be changed in position and with each unclamping rotational position facing a space removed from the clamped portion, and whose base end is located within the internal hole of the main body, and which is provided coaxially with the clamp rod. an intermediate member provided with a rotation stopping means for either the clamp loft or the main body and rotatable relative to the other and movable in the axial direction; and an intermediate member and the main body or the clamp rod; The above-mentioned rotatable side is screwed together, and the large screw part of the lead is screwed together so that it rotates with axial thrust, and the relative axial displacement of both sides is regulated so as to correspond to the above-mentioned rotation at the predetermined angle. a threaded joint, an acting force applying means provided to apply an axial acting force to the rotatable side and the intermediate member to change their relative positions in the axial direction, and the clamp rotating neck. The clamping force generating means is provided to move a certain clamp rod toward the proximal end side using fluid pressure to perform a clamping action.

When this clamping device is provided with rotation stopping means to prevent the intermediate member from rotating relative to the main body, and the intermediate member is rotatable relative to the clamp rod,
The clamping force generating means is composed of a first cylinder formed to extend the inner hole of the main body, a first piston fitted into the first cylinder and fixed to the clamp rod, and a first piston that is fixed to the clamp rod. Preferably, the relative axial displacement of the members from one side to the other is effected by the force of a spring, and the opposite movement is effected by fluid pressure acting on the first piston.

This has the advantage that the pressure fluid supply and discharge holes can be unified into one.

Further, in the case of this clamping device, the clamping force generating means is made up of a first cylinder and a first piston fixed to the clamp rod in the same way as above, and one of the relative axial displacements of the clamp rod and the intermediate member is Preferably, the displacement from one direction to the other is performed by the force of a spring, and the displacement in the opposite direction is performed by fluid pressure acting on the first piston and the intermediate member.

In addition, in the case of this clamp device, the acting force applying means causes the relative axial displacement of the clamp rod and the intermediate member from one side to the other by the acting force of the spring, and causes the intermediate member to move in the opposite direction. It is preferable to use fluid pressure acting on the This is effective in that the structure can be simplified.

Further, in the case of this clamping device, it is preferable that the clamping force generating means is one that applies fluid pressure to the intermediate member. This is advantageous in that one piston can be omitted.

Further, in the case of this clamp device, the clamping force generating means includes a first piston provided on the clamp rod and a first cylinder provided corresponding thereto, so that the first piston is attached to the clamp rod to align the axis. A first piston engaging portion is provided for transmitting a clamp force by the first piston, and the stroke of the intermediate member is adjusted so that the retaining portion of the clamp rod is in the retracted position of the clamp rod when the clamp rod is moved to the mounting surface of the clamped portion. It is better to set it so that it is located behind the position. This provides a clamp device in which the clamp rod does not protrude from the clamped part mounting surface in the unclamped state.

The clamping device is provided with rotation stopping means to prevent the intermediate member from rotating relative to the clamp rod;
If the intermediate member is rotatable relative to the main body,
The clamping force generating means includes a first cylinder formed to extend the inner hole of the main body and a first piston fitted into the first cylinder and fixed to the clamp rod, and the clamping force generating means includes the main body and the intermediate member. Preferably, the relative axial displacement from one side to the other is effected by the acting force of a spring, and the displacement in the opposite direction is effected by fluid pressure acting on the first piston.

<Function> For example, in the case of fixing a mold to a predetermined base surface, this clamp device is provided with a U-groove that spans the edge of the mold and the edge of the base, and It is used by fixing the clamp rod so that the engaging part is located at the U-groove end of the mold and the cylinder is located at the U-groove end of the base. In the clamped state, the clamp rod is in the clamp rotation position by the force applying means or fluid pressure, and is moved back by the clamping force generating means to draw the mold toward the base.

To change from the clamped state to the unclamped state, the fluid pressure applied by the clamping force generating means is released, and the clamp rod is brought to the unclamping rotational position by the fluid pressure or the acting force applying means. An explanation will be added regarding the change in the clamping rotational position and unclamping rotational position of the clamp rod. In this clamping device, if the intermediate member is provided with rotation stopping means to prevent it from rotating with respect to the main body, and the intermediate member is rotatable with respect to the clamp rod, the clamp rod snap joint portion is provided with a rotation stopper. The clamp rod is connected to the intermediate member through the clamp rod so that the positional relationship between the clamp rod and the intermediate member changes along the thread due to the thrust in the axial direction, and the intermediate member is prevented from rotating by the rotation stopper. . Therefore, when the intermediate member or the clamp rod moves back and forth while the clamp rod or the intermediate member is restrained from moving in the axial direction, the clamp rod rotates.

The angle of rotation is determined by determining the axial travel distance of the intermediate member relative to the clamp rod. If the intermediate member moves forward and backward while the clamp rod is restrained from moving in the axial direction, there is no need for the clamp rod to move forward in order to rotate the clamp rod, and the amount of protrusion from the base surface is reduced accordingly. .

The clamping device is provided with rotation stopping means to prevent the intermediate member from rotating relative to the clamp rod;
When the intermediate member is rotatable with respect to the main body 1
The main body is connected to the intermediate member via a threaded joint, and the positional relationship between the main body and the intermediate member changes along the thread due to thrust in the axial direction.The intermediate member is connected to the clamp rod by a rotation stopper. It is designed not to rotate relative to the Therefore, when the intermediate member moves back and forth, the clamp rod rotates. The rotation angle is determined by determining the axial travel distance of the intermediate member relative to the body. As in the above case, if the intermediate member moves forward and backward while the clamp rod is restrained from moving in the axial direction, the clamp rod does not need to move forward to rotate the clamp rod, and the substrate The amount of protrusion from the surface is small.

<Example> A first example of the present invention will be described using FIGS. 1 to 6. The clamp device of this embodiment has a clamp rod 2
The relative axial displacement of the intermediate member 1 from one side to the other is performed by the acting force of the spring 19, and the displacement in the opposite direction is performed by the pressure fluid acting on the first piston 28, and the clamp The force generating means 3 applies fluid pressure to the first piston 28.

The intermediate member l is a cup-shaped member with a circular cross-sectional shape,
As shown in FIG.
The main body 7 is fixed via a cylinder 29 and is housed inside a main body 7 having an inner circumferential surface with a circular (or rectangular or other non-circular) cross-sectional shape, with the opening facing downward. A protrusion 48 is provided on the outer periphery of the lower end, and the outer circumferential surface of the protrusion 48 has a shape corresponding to the inner circumferential surface of the main body 7, and is movable in the axial direction without rotating relative to the main body 7. Key provided.

In the figure, 25 is a key. Thereby, the intermediate member 1 can move forward and backward with respect to the main body 7 while being prevented from rotating.

The forward movement of the intermediate member l is performed by the extension force of the forward movement spring 49 disposed between the bottom part 52 of the main body 7 and the concave portion 51 opening on the lower side of the intermediate member l. The protrusion 48 of the member 1 comes into contact with the lower surface of the protrusion 50 provided on the inner peripheral surface of the main body 7 and stops. At the center of this intermediate member 1, a female thread 8 with a large lead is provided in the direction of the central axis so that it can be connected to the clamp rod 2.

The clamp rod 2 has a 1-shaped engagement part 11 for a clamped part lO such as a mold 9 at the distal end, and a male screw 13 screwed into the female screw 8 of the intermediate member l at the base end 12 in the axial direction. It is set in.

The clamping force generating means 3 is located at the base end 1 of the clamp rod 2.
A first piston 28 is provided at a position slightly above the male thread 13 of No. 2, and a cylindrical member 53 is provided so as to extend the inner hole of the main body 7.
and a first cylinder 29 formed above the main body 7 via a first cylinder 29, which generates an acting force to retract the clamp rod 2 in the clamp rotation position and clamp the mold 9 to the base 6. be.

The threaded joint 5 consists of a male thread 13 of the clamp rod 2 and a female thread 8 of an intermediate member 1 that is screwed into the male thread 13. It is. Since the intermediate member 1 does not rotate, the clamp rod 2 also rotates as it moves back and forth. This threaded joint 5 is an intermediate member l that moves along the male thread 13.
The movement range of the clamp rod 2 is restricted by the lower surface of the base end 12 and the upper inner surface of the first cylinder 29 that defines the ascending end position of the first piston 28, thereby restricting the rotation of the clamp rod 2 as follows. That is, when the intermediate member 1 is in a position where it contacts the lower surface of the proximal end portion 12 of the clamp rod 2, the engagement fill of the clamp rod 2 contacts the clamped portion 1 of the mold 9.
At the clamp rotation position facing 0, the protrusion 48 of the intermediate member 1 engages with the protrusion 50 of the main body 7, and the clamp rod 2 engages with the upper inner surface of the first piston 28 and the first cylinder 29. The female thread 8 of the threaded joint portion 5 is threadedly coupled to the male thread 13 at the lower part thereof in a state where they are in the raised end position where they are in contact with each other. When in this threaded connection position, the engaging portion 1 of the clamp rod 2.
1 is located at an unclamping rotational position facing a space outside the clamped portion 10 of the mold 9.

The acting force applying means 4 is configured to rotatably support the clamp rod 2 against the upward movement of the first piston 28 in order to move the intermediate member l and the first piston 28 in the direction of separation. A compression spring 19 is provided for the movement of 28 and intermediate member l in the direction of separation. That is, an annular thrust bearing 43 is provided on the upper surface of a protrusion 50 provided on the inner peripheral surface of the first main body 7, and is sandwiched between the thrust bearing 43 and the first piston 28, and the intermediate member l passes inside. The compression spring 19 is arranged as shown in FIG. The acting force of the compression spring 19 causes the first piston 28 to come into contact with the upper inner surface of the first cylinder 29 when the intermediate member 1 is at the rising end position. Compression spring 19 and forward spring 49
The strength of is such that when the clamp rod 2 is lowered, the compression spring 19 is first shortened, and then the forward spring 49 is shortened, and conversely, when the clamp rod 2 is raised, the strength is The forward spring 49 is configured to expand and then the compression spring 19 is expanded.

This clamp device is used, for example, based on a mold 9 of an injection molding machine.
Used for fixing to the top surface of l16.

As shown in FIGS. 1 and 2, a U@16 is provided across the edge of the mold 9 and the edge of the base 6, and this υ groove 16
The clamp rod 2 passes through the inside, and the engaging part 11 is connected to the U of the mold 9.
It is located at the clamped portion 10 at the end of the Uiii116, and is fixed with a bolt (not shown) so that the first cylinder 29 is located on the Uiii116 side of the base 6.

Figures 1 and 2 show the clamped state of the mold 9.
The operation of this device from the released state shown in FIGS. 3 and 4 until it is clamped will now be described. By supplying pressurized oil from the opening 54, the first piston 28 is moved against the compression spring 19 of the force applying means 4 to the base end 1 of the clamp rod 2.
2 is retreated downward until the lower surface of the intermediate member 1 contacts the upper surface of the intermediate member 1. This downward movement of the first piston 28 causes the rotatable lamp rod 2 to rotate 90 degrees, so that the engaging portion 11 is moved from the unclamped rotational position facing the groove 16 shown in FIGS. 3 and 4. The clamp rotation position is opposite to the clamped portion 10 shown in FIGS. 5 and 6. Engagement part 11
While the clamp remains in this rotational position, the pressure oil is applied to the first piston 2.
When B is further retreated downward from this forward position, the retaining part 11 comes into contact with the clamped part 10 of the mold 9 and moves from this to the base l.
116 to the upper surface side, and the mold 9 is fixed in a clamped state.

When replacing the mold 9 from this clamped state,
When the pressure oil is discharged from the opening 54, the intermediate member 1 is pushed up by the extension force of the forward spring 49 having a large spring constant, and the clamp rod 2 is also raised accordingly. As shown in FIG. 5, the protrusion 48 of the intermediate member 1 engages with the protrusion 50 provided inside the main body 7, and the engaging part 11 of the clamp rod 2 is in the raised position away from the clamped part 10. 1 piston 28
further advances due to the expansion of the compression spring 19, as shown in FIG.
The clamp rod 2 is screwed at the lower position of 3 and the clamp rod 2 is 90 mm.
Rotate degrees. At this time, the engaging portion 11 is in the unclamped rotation position facing the U-groove 16, and the mold 9 is in the unclamped state.

A second embodiment is shown in FIGS. 7 to 10. The main differences between this embodiment and the first embodiment are that the intermediate member l is separated from the lower surface of the base end 12 of the clamp rod 2 by the force of the pressure oil, and that the force applying means 4 is compressed. Spring 1
9 acts in the opposite direction, and a bell spring 57 is provided above the first piston 28 within the first cylinder 29. These points will be explained next.

The intermediate member l and the main body 7 have circular cross-sectional shapes, and two rods 58 extending downward are provided on the lower surface of the intermediate member l. These two wooden rods 58 are fitted into two through holes 59 provided in the bottom 52 of the main body 7, and allow the intermediate member 1 to move forward and backward in the axial direction without rotating with respect to the main body 7. This intermediate member 1 is retracted by pressure oil due to the above-described configuration.

The acting force applying means 4 is provided with a protrusion 56 on the outer periphery of the intermediate member 1 in order to apply an acting force to move the intermediate member 1 upward, and the upper end of the compression spring 19 is disposed on the lower surface of the protrusion 56. , the lower end of the compression spring 19 is in contact with the upper surface of the main body bottom 52. In order to provide an acting force that moves the first piston 28 upward and the intermediate member l downward, an opening 60 for supplying and discharging pressure oil is provided at an appropriate position on the lower circumferential wall of the first cylinder 7.

The spring 57 is connected to the first piston 2 within the first cylinder 29.
8 and drives the clamp rod 2 downward together with the first piston 28. This bell spring 57 holds the mold 9 from coming off the base 6 by the extension force of the spring 57 when the hydraulic pressure for maintaining the clamped state decreases, and is effective when clamping the mold to a slide. It is.

The spring constants of the bellows spring 57 and the compression spring 19, the effective area of the lower surface of the first piston 28 that receives the acting force of the pressure oil, the cross-sectional area of the two rods 58, and the throttle that controls the flow rate of the pressure oil passing through the opening 60. The adjustment is set so that the clamp device operates as follows. Since the other points are the same as those in the first embodiment, they will be indicated by the same drawing symbols and the explanation will be omitted.

Next, the operation of this clamp device will be explained. Figures 7 and 8
The figure shows the clamped state, and the operation of this apparatus will be explained in which the mold 9 is clamped from the released state shown in FIGS. 9 and 1O. By discharging pressure oil at a predetermined flow rate through the throttle (not shown) of the opening 60, the compression spring 19 of the force applying means 4 causes the intermediate member l to come into contact with the lower surface of the proximal end portion 12 of the clamp rod 2. and push up. Corresponding to the amount of displacement of the intermediate member 1 toward the proximal end 12, the clamp rod 2 connected via the threaded joint 5 rotates 90 degrees. As the clamp rod 2 rotates, the retaining portion 11 comes to the clamp rotation position shown by imaginary lines in FIGS. 9 and 1O. Next, by supplying pressure oil from the opening 54, the first
The piston 28 and the intermediate member 1 are pushed down against the extension force of the compression spring 19. As the first piston 28 descends, the engaging portion 11 comes into contact with the clamped portion lO of the mold 9 and presses it against the upper surface of the base 6, resulting in a clamped state in which the mold 9 is fixed.

When replacing the mold 9 from this clamped state,
By discharging pressure oil from the opening 54 and supplying pressure oil from the opening 60, the first piston 28
The engaging portion 11 of the clamp rod 2 is pushed up to the raised end position against the force, and thereby the engaging portion 11 of the clamp rod 2 is placed in a raised position away from the clamped portion 10. At this rising end position of the first piston 28, pressure oil is further supplied, and the intermediate member 1 is pushed down against the compression spring 19, so that the lower surface of the intermediate member 1 is brought into contact with the bottom 52 of the main body 7.
It stops when it comes into contact with the top surface. As the intermediate member 1 moves downward, the clamp rod 2 which is threadedly connected rotates 90 degrees, and the engaging portion 11 assumes the unclamped rotational position shown by the solid line in FIGS. 9 and 10. Therefore, it is possible to remove the mold 9 from the base 6.

In this embodiment, pressurized air is supplied and discharged from the opening 60,
Pressure oil may be supplied and discharged from the opening 54. In that case, a pressure oil supply and discharge valve that is switched to the discharge side by the pressure air supplied to the opening 60 is provided on the opening 54 side, and the clamping device is operated by pneumatic pressure. It can be controlled.

A third embodiment of this invention will be described using FIGS. 11 to 16. In the clamping device of this embodiment, relative axial displacement between the clamp rod 2 and the intermediate member 1 is performed from one side to the other by the force acting on the spring 19, and the displacement in the opposite direction is applied to the intermediate member 1. The clamping force generating means 3 applies fluid pressure to the intermediate member l.

As shown in FIG. 11, the intermediate member 1 is housed inside a main body 7 that is fixed along the back surface of the base IM 6 and has an inner peripheral surface whose cross-sectional shape is elliptical (or may be rectangular or other non-circular). The outer circumferential surface has a shape corresponding to the inner circumferential surface of the main body 7 so as not to rotate with respect to the main body 7. This intermediate member l is moved forward and backward by pressure oil, and is 20.21 in the figure.
This is an opening for supplying and discharging pressure oil. A female thread 8 with a large lead is provided at the center of the intermediate member 1 in the direction of the central axis so that it can be connected to the lamp rod 2.

The clamp rod 2 has an engaging portion 11 at its distal end, and a large diameter portion 12a of its base end 12 is provided with a male thread 13 that engages with the female thread 8 of the intermediate member l.゛The threaded joint 5 is connected to the male thread 13 of the clamp rod 2 and this male thread 1.
3 and a female thread 8 of an intermediate member l which is screwed together. A stopper 14 is provided at the lower end of the male thread 13 so that the male thread 13 and the female thread 8 do not become unscrewed.
When the intermediate member 1 is moved in the direction of detachment from the clamp rod 2, the upper surface of the stopper 14 comes into contact with a stepped portion 15 provided inside the intermediate member 1, thereby preventing the intermediate member 1 from coming off from the clamp rod 2. Since the intermediate member 1 does not rotate, the clamp rod 2 rotates as it moves back and forth. This threaded joint portion 5 restricts the rotation of the clamp rod 2 as follows by restricting the movement range of the intermediate member l that moves along the male thread 13 by the large diameter portion 12a and the stopper 14. That is, the intermediate member 1
is in a position where it contacts the stopper 14 of the clamp rod 2, the engaging part it of the clamp rod 2 is in the clamp rotation position facing the clamped part IO of the mold 9, and conversely, the intermediate member l is in contact with the clamp rod 2. When the clamp rod 2 is in a position where it contacts the lower surface of the large diameter portion 12a of the proximal end portion 12 of the clamp rod 2, the engaging portion 11 of the clamp rod 2 is in an unclamping rotation position facing a space outside the clamped portion 10 of the mold 9. It is formed as such.

The acting force applying means 4 is applied to the large diameter portion 12a of the clamp rod 2.
In order to move the intermediate member 1 in the direction in which the intermediate member 1 approaches, the clamp rod 2 is rotatably supported at the upward moving end when the intermediate member l moves upward, and the large diameter portion 12a and the intermediate member l A compression spring 19 is provided for movement away. That is, the proximal end 1 of the clamp rod 2
Bearing 17 that fits on the outer periphery of 2 and this bearing 1
An annular collar 18 is attached to the outer ring of the clamp rod 7, and the collar 18 is rotatable around the central axis of the clamp rod 2 via a bearing 17. A compression spring 19 is placed between the lower surface of the collar 18 and the upper surface of the intermediate member l so that the threaded joint 5 passes through the inner side. The force exerted by the compression spring 19 brings the intermediate member l into contact with the stopper 14. Also, clamp rod 2
The upper moving end of the body 7 is opposite to the outer ring of the bearing 17.
It is regulated by coming into contact with a step 22 provided on the inner surface of the upper end.

The clamping force generating means 3 is constituted by the intermediate member 1 and the main body 7, and generates an acting force for retracting the clamp rod 2 in the clamp rotation position by the acting force of pressure oil and clamping the mold 9 to the base 6. is generated.

11 and 12 show the clamped state, and the operation of this apparatus until the mold 9 is clamped from the released state shown in FIGS. 13 and 14 will be explained. By discharging pressure oil from the opening 20 and supplying pressure oil from the opening 21, the compression spring 19 of the force applying means 4 separates the clamp rod 2 and the intermediate member l along the axial direction, and the intermediate member l It moves to a position where it comes into contact with the retainer 14. Due to this downward movement of the intermediate member l, the rotating part or lamp rod 2 is rotated by 90 degrees, and the engaging part 11 is moved from the unclamped rotational position facing the groove 16 shown in FIGS. 13 and 14. The clamp rotation position is opposite to the clamped portion lO shown in FIGS. 15 and 16. When the retaining part 11 remains in this clamping rotation position and the pressure oil causes the intermediate member 1 to retreat further downward from this front position n, the engaging part 11 comes into contact with the clamped part 10 of the mold 9. Press this to the top side of the base 6,
The mold 9 is now in a clamped state.

When replacing the mold 9 from this clamped state,
When pressure oil is discharged from the opening 21 and pressure oil is supplied from the opening 20, the clamp rod 2 rises as the intermediate member 1 moves forward, and as shown in FIG. The outer ring of the bearing 17 that fits into the main body 7 comes into contact with a stepped portion 22 provided inside the main body 7. When the engaging part 11 moves further forward in this raised position away from the clamped part 10 against the extension force of the intermediate member 1 or the compression spring 19, the clamp rod 2 rotates 90 degrees, as shown in FIG. In this way, the intermediate member 1 is tightened until it comes into contact with the lower surface of the proximal end 12 of the clamp rod 2. At this time, the engaging portion 11 is in the unclamped rotation position facing the U-groove 16, and the mold 9 is in the unclamped state.

The fourth embodiment is shown in FIGS. 17 to 22, and the differences between this embodiment and the third embodiment will be described below.

The intermediate member 1 is a piston having a circular cross-sectional shape, and is housed in a main body 7 having an inner peripheral surface corresponding to the piston. The intermediate member 1 is provided with two shafts 35 extending downward in parallel to each other on the lower surface thereof, penetrating the bottom wall 34 of the main body 7, and protruding outward. This two-piece shaft 35 allows the intermediate member 1 to move forward and backward relative to the main body 7 without rotating. Further, the main body 7 is adapted to a relatively long stroke such that the engaging portion 11 of the clamp rod 2 is located rearward of the upper surface of the base 6 that contacts the mold 9 when the intermediate member 1 is in the retracted position. It is formed like this.

The clamping force generating means 3 connects the first piston 28 and the first
It consists of a first cylinder 29 that accommodates a piston 28. This first piston 28 is provided so as to be movable in the axial direction of the clamp rod 2, and is provided at the proximal end of the clamp rod 2 in order to transmit the clamping force caused by the pressure oil acting on the first piston 28 to the clamp rod 2. The outer shape of the portion 12 is made slightly larger than the outer shape of the clamp rod 2, so that it is provided as a stepped portion. The first piston engaging portion 36 is a stepped portion. The first cylinder 29 has an inner circumferential wall with a circular cross section.
It is provided in communication with the upper part of the main body 7. An annular protrusion 37 is formed on the inner peripheral surface of the connecting portion between the first cylinder 29 and the main body 7.
is provided, and the lifting of the clamp rod 2 is stopped when the outer ring of the bearing 17 that fits into the base end portion 12 of the clamp rod 2 comes into contact with the lower surface of the protrusion 37.

The main body 7 and the first cylinder 29 have supply and discharge ports for pressure fluid.
As shown in FIG. 7, one opening 38 is provided to open into the space above the first piston 28, and the other opening 39 is provided to open into the space between the intermediate member l and the first piston 28. Another opening 40 is provided so as to open into the space below the intermediate member l.

The engaging portion 11 of the clamp rod 2 is in the unclamp rotation position when the intermediate member 1 is in the position where it is in contact with the stopper 14 of the clamp rod 2, and the intermediate member 1 is in the lower surface of the large diameter portion 12a of the clamp rod 2. The clamp is in the rotational position when the clamp is in contact with the clamp.

41 and 42 in the figure are microswitches for detecting the position of the clamp rod 2 and switching the pressure fluid. This micro switch 41.
42 is driven by a protrusion 45 provided on a rod 44 that is formed parallel to the shaft 35 downward from the center of the lower end of the clamp rod 2 . Since the other points are the same as those of the third embodiment, the same reference numerals are used in the drawings and the explanation thereof will be omitted.

17 and 18 show the clamped state, in which the engaging part 11 of the clamp rod 2 is retracted into the U groove of the mold as shown in FIGS. 19 and 20. The operation of this device until it is clamped will be explained. opening 3
9 for discharging low pressure, e.g. compressed air, and opening 40.
By supplying the same low-pressure compressed air from , the clamp rod 2 moves upward together with the intermediate member 1 . At this time, the intermediate member 1 is pushed downward by the compression spring 19 and is in a position where it comes into contact with the stopper 14 of the clamp rod 2. The rise of the clamp rod 2 is caused by the proximal end 1 of the clamp rod 2.
The outer ring of the bearing 17 that fits into the first cylinder 29
It comes into contact with the lower surface of the protrusion 37 provided above and stops. At this time, the engaging portion 11 is located above the clamped portion 10. Furthermore, when the intermediate member 1 rises due to the pressure oil against the extension force of the compression spring, the upper surface of the intermediate member 1 is pushed up against the clamp rod 2.
It comes into contact with the lower surface of the proximal end 12 and stops. Due to the amount of relative axial displacement between the clamp rod 2 and the intermediate member l, the clamp rod 2 rotates 90 degrees with respect to the intermediate member 1, and the engaging portion 11 faces the clamped portion 10 of the mold 9. The clamp is in the rotating position. Further, as the clamp rod 2 rises, the first piston retaining portion 36 of the clamp rod 2 engages with the first piston 28 and pushes the first piston 28 upward. This state is shown in FIGS. 21 and 22. Next, by supplying high pressure oil from the opening 38, the first
The piston 28 engages with the No. 1 piston engaging portion 36 of the clamp rod 2 and pushes down the clamp rod 2 against the force of the low-pressure compressed air pushing up the intermediate member 1. As the clamp rod 2 descends, the engaging portion 11 comes into contact with the clamped portion 10 of the mold 9 and presses it toward the upper surface of the base 6, resulting in a clamped state in which the mold 9 is fixed.

When replacing the mold 9 from this clamped state,
By discharging the pressure oil from the opening 38, the intermediate member l pushes up the clamp rod 2 under the action of compressed air,
The retaining portion 11 is placed in a position where it is loosened from the clamped portion 10. Next, by discharging compressed air from the opening 40 and supplying compressed air from the opening 39, the compression spring 19 pushes down the intermediate member 1 to a position where it abuts against the retainer 14, and rotates the engaging portion 11 by 90 degrees. to the unclamp rotation position. As the intermediate member 1 further descends due to the action of compressed air, the clamp rod 2 that engages with it also descends, and the engaging portion 11 reaches the retracted position within the U-groove 16 of the mold 9.

At this retracted position, the mold 9 can be removed from the base 6 by simply moving it along the base.

The fifth embodiment will be explained using FIGS. 23 to 25.

The clamping device of this embodiment causes the relative axial displacement of the main body 7 and the intermediate member 1 from one side to the other by the force acting on the spring 19, and causes the displacement in the opposite direction by acting on the first piston 28. The clamping force generating means 3 applies fluid pressure to the first piston 28.

The intermediate member l is a disc-shaped member, and as shown in FIG. 23, the inner periphery has a circular cross-sectional shape (it may be rectangular or other non-circular shape) and is fixed to the back surface of the base gi6 via the first cylinder 29. It is housed inside a main body 7 having a surface. A male screw 13 of the threaded joint 5 is provided on the lower surface of the center of the intermediate member 1 so as to extend downward.

The clamp rod 2 has a single-shaped engagement portion 11 for the clamped portion IO, and a first piston 28 of the clamping force generating means 3 is provided at the base end portion 12.

The clamping force generating means 3 is located at the base end 1 of the clamp rod 2.
2, and a first cylinder 29 formed above the main body 7 so as to extend through the inner hole of the main body 7, and similarly to the above-mentioned embodiment, the first cylinder 29 is arranged in the clamp rotation position. A certain clamp rod 2 is moved backward to generate an acting force that clamps the mold 9 to the base g16. Further, a bolt 61.61 is screwed into the lower surface of the first piston 28 between the first piston 28 and the intermediate member l, and this bolt 61.61 is connected to a hole 66.61 provided in the intermediate member l.
66 is inserted. As a result, the intermediate member l can be moved to a position where it contacts the lower surface of the first piston 28 along the bolts 61, 61, and a position away from the first piston 28 where the lower surface of the intermediate member l engages with the head 62 of the bolt 61. It is designed so that it can be moved between. The advancing spring 49 arranged between the first piston 28 and the intermediate member 1 acts to separate the first piston 28 and the intermediate member 1, and raises the clamp rod 2 together with the first piston 28.

The threaded joint 5 is a female thread provided on the inner surface of a cylindrical member 64 that is fitted into a through hole 55 provided at the center of the bottom 52 of the main body 7 and is fastened and fixed to the bottom 52 of the main body 7 with 6 bolts. 8 and a male thread 13 of the intermediate member 1 which is screwed into the female thread 8, and the thread is a multi-thread thread with a large lead.

Since the cylindrical member 64 does not rotate, as the intermediate member 1 moves forward and backward, the clamp rod 2, which is stopped from rotating by the bolts 61 and 61, rotates together with the intermediate member 1. This threaded joint 5 restricts the movement range of the intermediate member l that moves along the female thread 8 by the upper surface of the cylindrical member 64 and the upper inner surface of the first cylinder 29 that determines the ascending position of the first piston 28. The rotation of the clamp rod 2 is regulated as follows. That is, when the intermediate member 1 is in a position where it comes into contact with the upper surface of the cylindrical member 64, the engaging part 11 of the clamp rod 2 is in the clamp rotation position facing the clamped part lO of the mold 9, and on the contrary, the clamp rod 2 and the intermediate member 1 are separated by the action force of the forward spring 49, and when the clamp rod 2 is at the rising end position where it comes into contact with the upper inner surface of the first piston 28 and the first cylinder 29, the threaded joint The female screw 8 of No. 5 is threadedly connected to the male screw 13 at the lower part thereof. When in this threaded connection position, clamp rod 2
The engaging portion 11 is located at an unclamping rotational position facing a space outside the clamped portion 10 of the mold 9.

The force applying means 4 is configured to rotatably support the intermediate member l and the clamp rod 2 against upward movement of the intermediate member 1 in order to move the intermediate member l in a direction away from the bottom portion 52 of the main body 7, A compression spring 19 is provided for the movement of the intermediate member l away from the bottom 52 of the body 7. That is, an annular thrust bearing 43 is provided on the upper surface of the bottom portion 52 of the main body, and this thrust bearing 43
A compression spring 19 is placed between the intermediate member 1 and the intermediate member 1, and the compression spring 19 is disposed so that the threaded joint 5 passes through the inner side. The acting force of the compression spring 19 causes the first piston 28 to come into contact with the upper inner surface of the first cylinder 29 while the intermediate member 1 is located away from the base end 12 of the clamp rod 2.

The strength of the compression spring 19 and the forward spring 49 is such that when the clamp rod 2 descends, the compression spring 19 is first shortened and then the forward spring 49 is shortened; When the spring 2 moves upward, the forward spring 49 is first expanded, and then the compression spring 19 is expanded.

Figure 23 shows the clamped state, where the mold 9 or the second
The operation of this device from the released state shown in FIG. 4 until it is clamped will be explained. By supplying pressurized oil from the opening 54, the first piston 28 is retracted downward against the compression spring 19 of the force applying means 4 to a position where the lower surface of the intermediate member l comes into contact with the upper surface of the cylindrical member 64. let 1st piston 2
8, the rotatable lamp rod 2 rotates 90 degrees, and the engaging portion 11 moves from the unclamped rotational position facing the groove 16 shown in FIG. 24 to the clamped position shown in FIG. 25. The clamp is in a rotational position opposite part lO. While the engaging portion 11 remains in this clamp rotation position, the pressure oil moves the first piston 28 further from this forward position to the forward movement spring 49.
When the engaging part 11 is retreated downward against the force, the engaging part 11 comes into contact with the clamped part 10 of the mold 9 and presses it toward the upper surface of the base 6, resulting in a clamped state in which the mold 9 is fixed.

When replacing the mold 9 from this clamped state,
When the pressure oil is discharged from the opening 54, the first piston 28 is pushed up by the extension force of the forward spring 49, which has a large spring force, and the clamp rod 2 also rises accordingly. 25th
As shown in the figure, a bolt 61 is provided on the first piston 28.
61 engages with the intermediate member 1, and when the intermediate member 1 is further advanced by the extension of the compression spring 19 in the raised position where the engaging portion 11 of the clamp rod 2 is away from the clamped portion 10, the 24th As shown in the figure, the first piston 28 comes into contact with the upper inner surface of the first cylinder 29, and the female thread 8 of the threaded coupling part 5 is threadedly coupled at the lower part of the male thread 13, and the clamp rod 2 is rotated 90 degrees. . At this time, the engaging portion 11 is in the unclamped rotation position facing the U-groove 16, and the mold 9 is in the unclamped state.

This fifth embodiment shows an example in which the intermediate member 1 is prevented from rotating with respect to the clamp rod 2 by bolts 61, 61 which are rotation preventing means, and the intermediate member 1 is rotatable with respect to the main body 7. The first to fourth embodiments are as follows:
An example is shown in which the intermediate member 1 is prevented from rotating relative to the main body 7 by a rotation preventing means, and the intermediate member 1 is freely rotatable relative to the clamp rod 2. It is also possible to create a clamp device in which the relationship between the intermediate member l, the main body 7, and the clamp rod 2 in the fourth embodiment is changed to the relationship shown in the fifth embodiment.

<Effects of the Invention> According to the present invention, the proximal end side of the clamp rod or the main body and the intermediate member are screwed together by a threaded portion with a large lead that can be rotated by an axial thrust, and the clamp rod or main body and the intermediate member are screwed together. The structure is simple because the clamp rod is rotated by a thrust force that changes the relative position in the axial direction, and the screw joint has a drive structure with stable surface contact, so it is compact, which is required for the clamp device in terms of space and strength. can be converted into Furthermore, the threaded connection part does not use a 5-shaped groove, which is difficult to process, so it is easy to process. In particular, in a simple lamp device in which the clamp rod remains protruding from the mold mounting surface, the first, second, and so on. As in the third and fifth embodiments, L has a simple structure.According to the first and fifth embodiments, only one pressure oil supply and discharge port is required; For example, since the retaining part of the clamp rod protrudes and rotates at a position slightly removed from the mold, the tip of the clamp rod does not need to protrude from the mold more than necessary in order to rotate the clamp rod. Since the amount of protrusion of the clamp rod from the mold mounting surface is small, the distance from the mold mounting surface is small when attaching and detaching the mold, which has the effect of making it easier to attach and detach the mold. . Types with a spring (clamp auxiliary spring) used to take up half of the space occupied by the spring or half of the clamping device, but since the amount of protrusion of the clamp rod when unclamping can be reduced, the deflection of the spring can be reduced, and the same spring can be used. The number of bellows springs used to generate force can be reduced to a fraction of that, and the clamp device can be downsized.

Further, in the clamp device of the type in which the clamp rod takes a retracted position in which the clamp rod does not protrude from the mold mounting surface, the fourth
It can be applied as in the embodiment, and in the case of this type, the conventional rack, binion, spline shaft and rack drive unit are required, which is complicated, but it is greatly improved and the cost reduction effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing the clamped state of the first embodiment of the present invention, Fig. 2 is a plan view of the clamped state of Fig. 1 seen from above, and Fig. 3 is the unclamped state of the first embodiment. FIG. 4 is a plan view of the unclamped state shown in FIG. 3 viewed from above. FIG. 5 is a longitudinal sectional front view showing the state in which the engaging part of the clamp loft of the first embodiment is in a position facing the clamped part and is loosened, and FIG. 6 is a plan view of the state shown in FIG. 5 from above. 7 is a longitudinal sectional front view showing the clamped state of the second embodiment of the invention, FIG. 8 is a plan view of the clamped state of FIG. 7 seen from above, and FIG. FIG. 10 is a plan view from above of the unclamped state shown in FIG. 9; FIG. 11 is a longitudinal front view showing the clamped state of the third embodiment of the invention; FIG. 12 11 is a plan view of the clamped state seen from above, FIG. 13 is a longitudinal sectional front view showing the unclamped state of the third embodiment, and FIG. 14 is a plan view of the first embodiment shown in FIG.
15th plan view of the unclamped state in Figure 3 viewed from above.
The figure is a longitudinal sectional front view showing a state in which the retaining part of the clamp rod of the third embodiment is in a position opposite to the clamped part and loosened; FIG. 16 is a plan view of the state shown in FIG. 15 viewed from above; Fig. 17 is a longitudinal sectional front view showing the clamped state of the fourth embodiment of the invention, Fig. 18 is a plan view of the clamped state of Fig. 17 seen from above, and Fig. 19 is a clamp rod of the fourth embodiment. A longitudinal sectional front view showing the unclamped state in which the engaging part is retracted into the U-groove of the base, FIG. 20 is a plan view of the unclamped state shown in FIG. 19 seen from above, and FIG. 21 is the clamp of the fourth embodiment. 22 is a plan view of the state shown in FIG. 21 viewed from above, and FIG. 24 is a longitudinal sectional front view showing the clamped state of the fifth embodiment.
FIG. 25 is a longitudinal sectional front view showing the unclamped state of the embodiment; FIG. 25 is a longitudinal sectional front view showing the fifth embodiment in which the retaining part of the clamp rod is in a position facing the clamped part and is loosened;
Fig. 26 is a longitudinal sectional side view of a conventional clamping device, Fig. 27 is a longitudinal sectional view of the same clamping device seen from the ■-■ direction in Fig. 26, and Fig. 28 is a longitudinal sectional front view of another conventional clamping device. It is a diagram. l...Intermediate member, 2...Clamp rod, 3.
...clamping force generating means, 4...acting force applying means, 5...threaded joint, 6...base, 7...
Main body, 9...Mold, 10-φ...Clamped part, 1
1... Engaging portion, 19... Compression spring, 28.47
... 1st piston, 29.0 1st cylinder, 36
...First piston retaining part.

Claims (10)

[Claims] (1) A main body with an inner hole, an engaging part at the tip, rotated by a predetermined angle around the central axis, and a clamp rotation position where the engaging part faces the clamped part and a space away from the clamped part. a clamp rod provided coaxially with the clamp rod and provided so as to be changed to an opposing unclamp rotational position and having a proximal end located within the inner hole of the main body; An intermediate member having a rotation stopper on one side and rotatable relative to the other and movable in the axial direction, and the intermediate member and the rotatable side of the main body or clamp rod are screwed together. a threaded joint part with a large lead screwed together so as to rotate with an axial thrust, and the relative axial displacement of both parts is regulated so as to correspond to the rotation of the predetermined angle;
an acting force applying means provided to apply an acting force in an axial direction to change the relative axial position of the rotatable side and the intermediate member, and a clamp rod in the clamp rotation position based on fluid pressure. A clamping device comprising a clamping force generating means that is moved toward an end to perform a clamping action. (2) In claim (1), a rotation stopping means is provided to prevent the intermediate member from rotating relative to the main body;
A clamp device characterized in that the intermediate member is rotatable with respect to the clamp rod. (3) In claim (2), the clamping force generating means comprises:
A clamp device comprising: a first cylinder formed to extend the inner hole portion of the main body; and a first piston fitted into the first cylinder and fixed to the clamp rod. (4) In claim (3), the relative axial displacement of the clamp rod and the intermediate member from one side to the other is performed by the acting force of a spring, and the displacement in the opposite direction is caused by fluid pressure acting on the first piston. A clamping device characterized in that the clamping device is configured to perform a clamping operation using a clamping device. (5) In claim (3), the relative axial displacement of the clamp rod and the intermediate member from one side to the other is performed by the acting force of a spring, and the displacement in the opposite direction is applied to the first piston and the intermediate member. A clamping device characterized in that the clamping device is adapted to be operated by applied fluid pressure. (6) In claim (2), the relative axial displacement of the clamp rod and the intermediate member from one side to the other is performed by the acting force of a spring, and the displacement in the opposite direction is performed by fluid pressure acting on the intermediate member. A clamping device characterized by: (7) In claim (2), the clamping force generating means comprises:
A clamp device that applies fluid pressure to an intermediate member. (8) In claim (2), the clamping force generating means is fitted into a first cylinder formed to extend the inner hole of the main body and is movable in the axial direction on the clamp rod. The first piston is provided with a first piston engaging portion for transmitting clamping force by the first piston, and the stroke of the intermediate member is controlled by the engaging portion of the clamp rod when the clamp rod is in the retracted position. A clamp device characterized in that the clamp device is positioned rearward from the mounting surface position of the part. (9) In claim (1), a rotation stopper is provided to prevent the intermediate member from rotating relative to the clamp rod, and the intermediate member is rotatable relative to the main body. clamping device. (10) In claim (9), the clamping force generating means includes a first cylinder formed to extend the inner hole of the main body, and a first piston fitted into the first cylinder and fixed to the clamp rod. The relative axial displacement of the main body and the intermediate member from one side to the other is performed by the acting force of a spring, and the displacement in the opposite direction is performed by fluid pressure acting on the first piston. A clamp device characterized by: