JPH0214811Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mold clamping device mainly used for clamping and fixing an upper mold to a mold mounting plate of a press molding machine.

(Prior art) Conventionally, it has been common practice to use bolts to tighten and secure a mold to the mold mounting plate of a press molding machine, but this method is troublesome to tighten and untighten. This method is not suitable for cases where the mold needs to be replaced frequently. Therefore, as a solution to this problem, as shown in FIG. 6, a clamp body 51 that can move forward and backward is provided with clamp claws 53 that are extendable and retractable using an air cylinder 52 that is built into the clamp body 51 and provided above and below the clamp body 51. ,53
It is known that the mold 54 is clamped and fixed to the mold mounting board 55 using a clamp.
2 should fail, the mold mounting board 55 and the mold 5
There was a problem in that the tightening with 4 became loose, which not only caused product defects, but also led to major accidents such as the mold falling. In addition, as a mold in which the mold is tightened, loosened, and attached/detached by advancing and retracting movements,
As seen in Publication No. 34377, the tie bolt is moved forward and backward by moving a key provided with an inclined surface, and a cam roller is provided on a nut fixed to the tie bolt, and the cam roller is attached to the cam frame of the cam frame attached to the key. A structure has already been proposed in which the tie bolt can be rotated 90 degrees by engaging with the groove, and the moving frame and push plate can be tightened, loosened, and attached/disconnected by advancing and retracting the key. With this configuration, if a failure occurs in the cylinder or the hydraulic/pneumatic circuit, the tightening will loosen,
There is a risk of a fall accident.

(Problems to be solved by the invention) This invention solves the above-mentioned problems, and even in the unlikely event that fluid leaks from the drive mechanism or malfunctions of the cylinder or hydraulic/pneumatic circuit occur during use. This mold clamping device was developed with the aim of providing a mold clamping device that does not loosen and can drive the clamping claws in both horizontal and vertical directions using a single drive source.

(Means for Solving the Problems) The present invention provides a feed screw that is rotated forward and backward by a motor in a cylindrical guide rail with a slit formed through the bottom plate. A wedge body whose upper end surface is a downwardly inclined plane is provided so as to be movable forward and backward by screwing with a feed screw. A clamp metal with a clamp claw is supported at the lower end of the hanging body, and a sliding surface for the clamp metal is provided between the wedge body and the clamp metal, and the sliding surface is always pressed forward via a compression spring. It is characterized by the interposition of a movable frame.

(Example) Next, an example of the present invention will be described in detail based on the drawings. Reference numeral 1 designates a cylindrical guide rail with a slit 3 provided in the bottom plate portion 2. Bearing plates 4, 4 are stretched over the front and rear openings of the guide rail 1, and shafts are attached to both bearing plates 4, 4. A supported feed screw 5 is provided in the axial direction of the guide rail 1. This feed screw 5
is rotated in forward and reverse directions by a motor 6 such as a hydraulic motor attached to the rear of the guide rail 1. Reference numeral 7 denotes a wedge body which is screwed onto the feed screw 5 and moves back and forth within the guide rail 1. The wedge body 7 has an upper end surface formed into a front downward slope 8, and a press plate 9 on one rear side.
is provided protrudingly, and a locking piece 10 is provided on one side of its front part.
is installed protrudingly. Reference numeral 11 denotes a clamp, and the clamp 11 is provided with a clamp claw 12 at the lower end that hangs down through the slit 3, and the lower end surface of the arm 13 connected to one side of the upper end is connected to the inclined surface 8 of the wedge body 7.
It is formed on the front downward inclined surface 13a that engages with the front downward slope surface 13a. In addition, a stopper piece 14 is provided protruding from the center of the front surface of the clamp metal 11, and a collar plate part 15 is stretched from the lower part of the rear surface.
a is engaged with and held by the inclined surface 8 of the wedge body 7, and the clamp pawl 12 is suspended below the guide rail 1 through the slit 3. Reference numeral 16 denotes a sliding frame interposed between the wedge body 7 and the clamp metal 11, and has a sliding surface 17 on one side of its rear end for sliding with the clamp metal 11. A compression spring 18 is interposed between the front surfaces of the plates 9. The clamp metal 1 is placed under the pressure of the compression spring 18.
The rear surface of the clamp 11 and the sliding surface 7 are in contact with each other, and the front surface of the clamp 11 is engaged with the above-mentioned engagement piece 10 protruding from one front side of the wedge body 7.
Note that this compression spring 18 has one end attached to the sliding frame 1.
The pin 20 is fitted into a cylindrical hole 19 provided on the rear surface of the press plate 6, and the other end thereof is fitted into a pin 20 implanted in the press plate 9. The sliding frame 16 has its upper and lower surfaces in contact with the upper and lower surfaces of the guide rail 1 and its outer surface in contact with one side of the guide rail 1, and further has a front plate portion 21 connected to the front end of the sliding frame 16. The tip end surface of the guide rail 1 is in contact with the other side surface so that it can slide smoothly within the guide rail 1. In addition, 22 is a collar plate part 15 protruding from the lower part of the rear surface of the clamp metal 11.
This is a compression spring interposed between the upper surface and the lower surface of the sliding frame metal 16, and when the clamp is released, the clamp metal 11
This is to press down.

(Function) As shown in FIG. 5, in this structure, a large number of molds are installed on the outside of the mold mounting board 32, etc. of the press molding machine so that the bottom surface of the mold mounting board 32 and the bottom surface of the guide rail 1 are aligned. They are used by mounting them facing each other, and as shown in Fig. 1, the upper surface of the mold 31 is brought into contact with the lower surface of the mold mounting plate 32, and the motor 6 is driven forward to rotate the feed screw 5 in the forward direction. For example, the wedge body 7 screwed onto the feed screw 5 moves forward, and the sliding frame 16 presses against the pressing plate 9 protruding from one rear side of the wedge body 7 via the compression spring 18.
is pushed forward and moves forward. At the same time, the clamp metal 11 is also pressed by the sliding surface 17 and moves forward together with the wedge body 7 and the sliding frame metal 16, and the clamp claw 12 at the lower end hanging down through the slit 3 of the guide rail 1 is attached to the mold 31. It reaches the engaging portion 34 of the flange portion 33. Subsequently, the clamp claw 12 engages the engaging portion 34.
When the stopper piece 14 comes into contact with the tip of the slit 3 and the forward movement of the clamp 11 is stopped, the sliding frame 16 also stops, but the pressure between the rear surface of the sliding frame 16 and the wedge body 7 Since a compression spring 18 is interposed between the wedge body 7 and the plate 9, the wedge body 7 continues to move forward while compressing the compression spring 18, as shown in FIG. The inclined surface 8 pushes up the forward downward inclined surface 13a of the clamp metal 11, the clamp metal 11 moves upward, and the clamp claw 12 tightens and fixes the flange portion 33 of the mold 31. If the motor 6 is stopped at this stage, the wedge body 7 is screwed onto the feed screw 5, so there is no risk of the tightening loosening, and the mold 31 can be securely tightened and fixed to the mold mounting board 32. It is. In addition, in order to remove the mold 31 from the mold mounting board 32, by driving the motor 6 in reverse and rotating the feed screw 5 in the reverse direction, only the wedge body 7 moves back and the clamp metal 1
The inclined surface 8 of the wedge body 7 that has entered in front of the inclined surface 13a of the wedge body 7 returns to its old state, the clamp metal 11 also returns downward, and the clamping fixation of the flange portion 33 of the mold 31 by the clamp claw 12 is released. That will happen. In this case, since the compression spring 22 is interposed between the lower end surface of the sliding frame 16 and the upper surface of the flange plate portion 15 of the clamp metal 11, the tightening and fixing of the clamp claw 12 can be quickly released. Next, as only the wedge body 7 moves forward, the locking piece 10 protruding from one front side of the wedge body 7, which has been unlocked, and the front part of the clamp metal 11 are also locked again. body 7
, the clamp metal 11 and the sliding frame metal 16 simultaneously retract under the locking of the locking piece 10, and the clamp claw 12 engages the engagement part 34 of the mold 31.
The mold 31 can be removed from the mold mounting board 32. In this way, in the present invention, the rotational motion of the motor 6 is converted into the linear motion of the wedge body 7 which is screwed onto the feed screw 5, so that even if the power is cut off during clamping, the wedge body 7 starts to move due to vibrations during pressing. Even if the wedge body 7 moves slightly, the operating directions are orthogonally separated so that the clamp metal 11 tightens and loosens the mold 31 by moving up and down, and engages and disengages the mold 31 by moving left and right. Therefore, loosening of the clamping on the mold 31 will not be transferred to the movement of releasing the lock, and there is no danger of the mold 31 falling.

(Effects of the invention) As is clear from the above description, the present invention consists of a wedge body that moves forward and backward in the guide rail by forward and reverse rotation of the feed screw, a clamp metal that moves forward and backward with this wedge body, and a sliding frame. By cleverly combining these, it is possible to easily tighten and release the mold to the mold mounting board using a single drive source, and
As long as the feed screw is not reversed, there is no risk of the clamping loosening and there is no risk of falling accidents, and it has great practical value as it eliminates the problems of conventional mold clamping devices of this type. It's a big thing.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of the present invention, Fig. 2 is a partially cutaway plan view, Fig. 3 is a partially cutaway perspective view of the main part, and Fig. 4 is a similar different aspect. 5 is a bottom view showing the present invention in use, and FIG. 6 is a partially cutaway side view showing a representative example of a conventional mold clamping device of this type. 1: Cylindrical guide rail, 2: Bottom plate, 3: Slit, 5: Feed screw, 6: Motor, 7: Wedge body, 8: Front downward slope, 9: Press plate, 10: Engagement piece, 11: Clamp metal, 12: Clamp claw, 1
3: Bracelet, 13a: Front downward slope, 16: Sliding frame, 17: Sliding surface, 18: Compression spring.

Claims (1)

[Scope of utility model registration request] A feed screw 5 that is rotated in forward and reverse directions by a motor 6 is provided in a cylindrical guide rail 1 with a slit 3 formed through the bottom plate 2, and the guide rail 1 has an inclined surface whose upper end surface is downward downward in the front. A wedge body 7 having a number 8 is provided so as to be movable forward and backward by screwing with the feed screw 5,
The wedge body 7 has an inclined surface 13 that engages with the inclined surface 8.
A is provided at the upper part, and a clamp metal 11 having a clamp claw 12 is supported at the lower end hanging down through the slit 3, and a sliding surface with the clamp metal 11 is provided between the wedge body 7 and the clamp metal 11. 17 and a sliding frame 16 which is normally pressed forward via a compression spring 18 is interposed therebetween.