JPH0120028Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention belongs to the technical field of push/pull drive devices for clamps for fixing molds of processing machines (presses, die-casting machines, forging machines, injection molding machines, etc.).

In the processing machine described above, it is necessary to appropriately adjust the position of the mold fixing clamp depending on the dimensions of the mold.

The conventional push/pull drive device, as shown in FIG.
The chain 102 introduced into the guide groove 101 of the mold fixing platen 100 of the slide of the press machine is clamped by the clamp 1.
03, the chain 102 is restrained from bending by the guide groove 101, and the sprocket 105 is rotated.
This is a structure in which the clamp 103 is moved forward and backward through the clamp 2. Note that reference numeral 106 is a guide for the hydraulic hose 107.

In this device, the rotation of the sprocket is prevented by the braking force of the drive motor, but in the slide of a press machine, the acceleration is as high as 30 to 60 G, and the acceleration varies depending on the mass of the chain extending above the sprocket. Since a large inertial force acts on the chain, a torque larger than the braking torque of the meter acts on the sprocket, causing the sprocket to gradually rotate. As a result, there are problems in that the clamp moves and loosens, the mold falls off, and the clamp waiting at the end of the bolster gradually moves to the center.

In order to solve the above problem using the structure of the conventional device, it is necessary to install an extremely large braking means, but this increases the size and cost of the device.

In view of the above-mentioned drawbacks, the present invention provides a mold fixing plate of a processing machine with a guide groove that opens at the side end.
Insert the legs of the clamp into the guide groove so that they can move forward and backward, and attach a drive device to the side end of the mold fixing plate so that it faces the end of the guide groove. By rotating a vertical screw shaft that is pivoted and interlocked with the support metal fitting, the support metal fitting can be driven up and down, and a buffer mechanism is interposed in the transmission system from the motor to the support metal fitting. The drive band from the drive device to the clamp is composed of a single chain that can be bent in only one direction, and its starting end is fixed to the drive device, and its starting end is wrapped around the sprocket to form a U-shape. The terminal end portion is introduced into the guide groove so that it can move forward and backward through the direction switching guide portion, and the terminal end portion is connected to the leg portion of the clamp. , a pair of guide tools fixed vertically facing each other at a predetermined interval on both sides of the sprocket, and in the straight section of the guide groove, the drive band is guided by the wall surface of the guide groove, thereby bending the drive band. The above-mentioned drive device can move the clamp forward and backward along the guide groove via the drive band.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a bottom view of a mold fixing platen 1 on the slide side of a press machine, and a mold 2 is fixed to the mold fixing platen 1 with two sets of clamps 3 on each side. The leg portions 3a are inserted into guide grooves 4 made of T-grooves recessed in each mold fixing platen 1, and can move forward and backward along the guide grooves 4.

Each drive device 4 is attached to the side end surface of the mold fixing platen 1 at a position facing the guide groove 5 corresponding to each clamp 3, and a drive band 6 is connected from the drive device 4 to the clamp 3 via the guide groove 5. The clamp 3 is moved back and forth to the left and right by a drive device 4.

That is, as shown in FIGS. 2 to 5, the drive device 4 is installed in an upright position in which the sprocket 7 is freely inserted into a support fitting 8 that is rotatably supported, and is interlocked and connected via a buffer mechanism 9. The screw shaft 10 of the electric motor 12
By rotating the support fitting 8, the support fitting 8 is lowered or raised, thereby causing the drive band 6 wound around the sprocket 7 to be operated to be paid out or retracted.
The clamp 3 is moved leftward or rightward.

A guide rod 11 is slidably inserted vertically into the support fitting 8 at a position symmetrical to the screw shaft 10 to guide the support fitting 8. The lower end of the screw shaft 10 is rotatably supported by a guide block 14.
The upper end of the motor 12 is connected to the output shaft of the motor 12 via a speed reducer 13 . Further, the lower end and upper end of the guide rod 11 are connected to a guide block 14 and a sleeve 15, respectively.
is fixed.

The drive band 6 is constructed by attaching a breakage preventive device 18 having a U-shaped cross section and a length corresponding to the connecting plate 17 of the steel chain 16 to bring the end surfaces of adjacent ones into contact with each other. The chain 16 has a structure in which a idler ring 19 is pivotally supported at both ends of the connecting pin, and its starting end is fixed to the lower part of the casing 21 of the drive device 4 with a fixture 20, and its starting end is attached to the sprocket 7. Wrap it around and fold it back downward, and introduce the terminal end side into the guide groove 5 so as to move forward and backward through the direction switching guide part 22 formed on the guide block 14, and the terminal end part is inserted into the leg part 3 of the clamp 3.
It is connected to the right end of a.

In the guide groove 5, the idler ring 19 is loosely fitted into the guide portion 5a of the guide groove 5, and is unbendably restrained by the guide wall surface 5b (see FIG. 5). In addition, the drive device 4
Inside, the drive band 6 on both sides of the sprocket 7
A pair of guide tools 23 having a U-shaped cross section are attached vertically facing each other along the inner surface of the casing 21, and the free end portions of the guide tools 23 are in contact with the idler ring 19, This restrains the drive band 6 on both sides of the sprocket 7 from bending outward.

In addition, in the above-mentioned straight line portion, the drive band 6 is restrained from bending inward by abutting the end surfaces of the anti-bending tool 18 against each other.

The direction switching guide section 22 is composed of a J-shaped guide wall surface 14a formed on the lower side of the guide block 14, and a guide tool 23 extending in a J-shape to the outside of the drive band 6.

Here, when the screw shaft 10 is rotated by the motor 12, the support fitting 8 is gently lowered or raised, so the sprocket 7 that engages the drive band 6 is rotated clockwise or counterclockwise. The drive band 6 is advanced or retracted at low speed, and the clamp 3 is moved to the left or right.

When the support fitting 8 rises, tension is applied to the drive band 6, so its operation is simple; however,
When the support fitting 8 is lowered, the bending of the drive band 6 is restrained by the bending prevention device 18, the guide device 23, and the guide walls 5b, 14a, so that the drive band 6 can transmit compressive force.

When the clamp 3 approaches the mold 2 and collides with the mold 2, the buffer mechanism 9 buffers the clamp 3 and prevents the screw shaft 10 from being destroyed, and also keeps the drive band taut at all times. As shown in FIG. 4, a screw shaft 10 is loosely fitted into the upper and lower spring seats 8a of the support fitting 8, and a hexagonal nut 8b is attached to the screw shaft 10 approximately in the center between both spring seats 8a. screw together,
A compression coil spring 24 is mounted on the screw shaft 10 between the hexagonal nut 8b and each spring receiving part 8a.

When the screw shaft 10 is rotated, the hexagonal nut 8b is prevented from rotating by the support metal fitting 8, and the hexagonal nut 8b is raised or lowered, and the support metal fitting 8 is raised or lowered via the coil spring 24. When the clamp 3 collides with the mold 2 or the like and suddenly stops, the elastic force of both coil springs 24 buffers the clamp 3 and prevents damage to the screw shaft 10 and the nut 8b. However, instead of the coil spring 24, various elastic bodies can be used.

Instead of the buffer mechanism 9, it is also conceivable to interpose a slip coupling spring or a braking mechanism in the transmission system from the motor 12 to the support fitting 8.

Next, a hydraulic hose 25 for supplying hydraulic pressure to the hydraulic clamp 3 is guided into a tunnel 26 between the chain 16 of the drive belt 6 and the U-shaped anti-bending device 18, and its starting end is connected to the guide block. 14 so that hydraulic pressure can be supplied and discharged from a hydraulic pressure supply device (not shown), and its terminal end is connected to an oil path to a hydraulic cylinder of the clamp 3. In the tunnel 26, for example, as shown in phantom lines in FIG. 2, a cable 27a to a limit switch 27 for detecting the forward limit position of the clamp 3 can also be led.

Here, in place of the drive band 6, a single-fold chain 6 which can be bent only in one direction as shown in FIG.
A can also be used, or a steel strip plate with an arcuate or bow-shaped cross section can also be used.

Note that the clamp 3 is not limited to a hydraulic type, and can be applied to various types of clamps.

It is also conceivable to omit the motor 12 and the threaded shaft 10, and link the support fitting 8 to a piston rod of a cylinder (hydraulic/air pressure) so that the cylinder moves up and down.

In addition, the push/pull drive device for a clamp of a processing machine according to the present invention can be easily applied to push/pull drive a workpiece pallet of a machine tool.

As mentioned above, the present invention has a structure in which the drive band is kept in a tight state through the elevating and lowering sprocket, and the support block that pivots the sprocket is raised and lowered through the screw shaft, so it can withstand large accelerations during press processing. Even if the resulting force acts on the drive band, the support fittings hardly move, so the clamp can be held at a predetermined stop position.

In addition, since a buffer mechanism is installed in the transmission system from the motor to the support metal fittings, the transmission mechanism between the screw shaft and the support metal fittings will not be damaged in the event of a sudden stop due to collision with a clamp mold, etc. Excellent durability.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, FIG. 1 is a plan view of a mold fixing plate of a slide of a press machine, FIG. 2 is a longitudinal sectional front view of the main part, and FIG. Fig. 4 is a sectional view along the line shown in Fig. 3,
Fig. 5 is a sectional view taken along the line shown in Fig. 2, Fig. 6 is a partial front view of a modified example of the drive band, and Fig. 7 is a second view of the conventional device.
It is a schematic diagram equivalent to a figure. DESCRIPTION OF SYMBOLS 1... Mold fixing plate, 3... Clamp, 3a... Leg of 3, 4... Drive device, 5... Guide groove, 5b... Wall of 5, 6... Drive band, 7... Sprocket, 8... Support metal fittings, 9... Shock absorber, 10... Screw shaft, 12... Motor, 22... Direction switching guide section, 23... Guide tool.

Claims (1)

[Scope of claim for utility model registration] A guide groove 5 is recessed in the mold fixing plate 1 of the processing machine,
The legs 3a of the clamp 3 are inserted into the guide groove 5 so that they can move forward and backward, and the drive device 4 is attached to the side end of the mold fixing platen 1 so as to face the end of the guide groove 5. is rotatably supported on a support fitting 8, and a vertical screw shaft 10 operatively connected to the support fitting 8 is rotated by a motor 12, thereby making it possible to drive the support fitting 8 up and down.
A buffer mechanism 9 is interposed in the transmission system from the motor 12 to the support fitting 8, and the drive belt 6 from the drive device 4 to the clamp 3 is
It is composed of a single-fold chain that can be bent in only one direction, and its starting end is fixed to the drive device 4 side, and its starting end is wrapped around the sprocket 7 and folded back into a U shape to form the direction switching guide section 22. Then, the terminal end portion thereof is introduced into the guide groove 5 so as to be freely forward and backward, and the terminal end portion thereof is connected to the leg portion 3a of the clamp 3. A pair of guide tools 23 are fixed vertically facing each other at a predetermined interval on both sides of the
In addition, in the straight portion of the guide groove 5, the wall surface 5b of the guide groove 5 guides the drive band 6 to prevent the drive band 6 from bending, and the drive device 4 passes the clamp 3 through the drive band 6.
A push/pull drive device for a clamp of a processing machine, characterized in that the clamp can be moved forward and backward along a guide groove 5.