JPH0129051Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vertical molding machine, such as a vertical injection molding machine, a vertical press, a vertical die casting machine, etc., which has a mold clamping part safety device.

The basic configuration of a vertical molding machine including a vertical injection molding machine is, as is well known, between a fixed upper platen and a lower platen that are connected via a guide rod or tie rod. By installing a slide platen that can be raised and lowered, and by installing a lower mold on the lower platen and an upper mold on the slide platen, the required molding operation can be performed by closing and separating the upper and lower molds through the raising and lowering of the slide platen. In this case, the following means have been conventionally adopted as a safety device to prevent the slide platen from falling accidentally. In other words, when the slide platen is raised to its highest position (top dead center), the fall prevention mechanism is automatically activated.An example of this fall prevention mechanism is, for example, when the slide platen reaches the top dead center position. At the same time, a locking pin is inserted below the platen to prevent it from falling, or a locking bar provided on the fixed upper platen side is inserted into the sliding platen, and the locking bar is surrounded by a locking tube known as the product name Bear Lock Tube. A known special hydraulic cylinder is attached to the slide platen side, and when the slide platen reaches the top dead center position, the pressure oil in the hydraulic cylinder is removed and the lock bar is automatically locked by an elastic body provided in the cylinder. This includes locking the device in place and preventing it from falling. However, with these means of preventing the sliding platen from falling by locking it at the top dead center position, it is impossible to change the stroke depending on the size and thickness of the upper and lower molds used. Even in this case, there is an inconvenience such as a long press cycle time because the top dead center is locked, and if a special hydraulic cylinder is used, it must be unlocked at all times during machine operation, resulting in energy loss. There are disadvantages,
Even if this is not the case, such an internal lock system has the disadvantage that it is completely impossible to confirm from the outside whether or not the lock is locked, which may cause anxiety to the operator. In addition, there is a method in which a safety bar is inserted at the bottom dead center position of the slide platen, and the safety bar is set when an operator enters the machine for mold setup, etc. This is a completely manual method and is extremely tedious.

The present invention was made in order to solve the problems of the prior art described above, and includes a fixed lower platen holding a lower mold, an upper platen fixed above the lower platen, and an upper and lower platen. In a vertical molding machine, the vertical molding machine is equipped with a slide platen that is disposed between the platens of the upper and lower molds and can be raised and lowered to hold the upper mold, and has a safety device for the mold clamping part of the upper and lower molds, and the following technical measures are taken. ing.

That is, the present invention includes a lifting cylinder mechanism having a cylinder 9 and a piston rod 10 slidably fitted into the cylinder 9 on the upper platen 1, and a lock mechanism 11 for locking the piston rod 10.
The upper end 6a of the safety rod 6, which has a plurality of engagement steps 5 arranged at intervals in the longitudinal direction of the rod, is connected to the piston rod 10.
The safety rod 6 is connected to the slide platen 4 and extends downward to pass through the slide platen 4 in the vertical direction. A stopper 8 is provided which is engaged with the engagement step 5 of No. 6 and allows the safety rod 6 to pass through when opened.

The present invention will be described in detail below based on the illustrated embodiment. In FIGS. 1 and 2, 1 is an upper platen, 2 is a lower platen, and both platens 1 and 2 are connected by a plurality of tie rods 3. Both platens 1 and 2 are fixed, and a slide platen 4 is installed between both platens 1 and 2 via the tie rod 3 so as to be movable up and down toward the lower platen 2. Reference numeral 24 serves as a source for driving the slide platen 4 up and down. A hydraulic or other drive cylinder is shown. Since these are similar to those of a conventional vertical molding machine and are known, the arrangement relationship is merely shown and is not shown, but the lower mold is on the lower platen 2, and the upper mold is on the slide platen 4. The molds are placed respectively. In addition, there are safety gates that block the sides of the mold clamping part between the upper and lower molds of the slide platen 4 and lower platen 2, and injection devices in the case of injection molding machines, but these are directly related to the present invention. Since there is no such thing, it has been omitted entirely.

In the present invention, in a vertical molding machine having such a type, as shown in Figs. The safety rods 6 arranged in a row are supported by a support mechanism 7 so as to be movable up and down, and the slide platen 4 is provided with a stopper 8 that can be engaged with and detached from the safety rods 6.

The details of the support mechanism 7, as illustrated in FIG. The upper ends 6a of the safety rods 6 are connected together by a screw connection or the like, and the lock mechanism 11 of the piston rod 10 is free, but is designed to be able to be automatically controlled.
In the illustrated example, as mentioned earlier, a special hydraulic cylinder known by the trade name Bear Lock Tube is used, and the elastic body built into the cylinder surrounds the piston rod 10, allowing pressure oil to be removed. The rod 10 is then held and locked by the elastic body. The piston rod 10 in the vertically moving cylinder 9 is of a double rod type, and the opposite side of the piston rod 10 to the side connected to the upper end 6a protrudes outside the cylinder 9, and a limit switch 12 is operated by the protruding end. are arranged via appropriate support members. This limit switch 1
When the safety rod 6 is at the upper limit position, the protruding end of the safety rod 2 is actuated to emit a signal, and is used when adjusting the lock position.

The detailed structure of the stopper 8 provided on the slide platen 4 is as shown in FIGS. 4 to 7.
It consists of a pair of stopper pieces 14, 14 provided on the bracket 13, and a drive cylinder 15 for opening and closing the stoppers 14, 14.
As shown in FIGS. 4 and 5, the bracket 13 includes a pair of parallel plates 13a, 13a into which the safety rod 6 is loosely inserted so that it can be raised and lowered, and both plates 13a, 1.
and an end plate 16 equipped with a bush 16a that is attached transversely to the lower end of the safety rod 3a and circumscribes the outer periphery of the large diameter portion of the engagement step 5 in the safety rod 6,
A pair of stopper pieces 1 are provided on the outer surface of the end plate 16, which can hold the circumferential side of the safety rod 6 in a freely openable and closable manner.
4 and 14 are pivotally supported via respective pin shafts 17 and 17 so as to be openable and closable, as shown in FIGS. 4, 5 and 6. The stopper pieces 14, 14 are symmetrically formed with arc-shaped recesses 14a, 14a which clamp the tapered part 5a of the engagement step 5 in the rod 6 by closing, and the pin shafts 17, 17 Corresponding portions of the stopper pieces 14, 14 close to the pivot portion are formed with corresponding recesses 19, 19 in which a dog 18 provided at one end of the piston rod 15a of the drive cylinder 15 engages in a movable manner.
Also, both stopper pieces 14, 14 are connected to each other by the tension spring 2.
By fixing each end of the bullet plate 16, it is elastically supported in a normally closed state, and the bullet plate 16 has both stopper pieces 1
Each set of limit switches 21a, 21b is provided for checking the open/closed state of the limit switches 4, 14, and each set of limit switches 21a, 21b is provided on the stopper pieces 14, 14.
Actuators 22, 22 are provided correspondingly.

For example, an air cylinder or the like is used as the drive cylinder 15, but as shown in FIGS. 4, 5 and 7, one plate 13 in the bracket 13
Installed using a, its piston rod 15
a is a double rod type, cylinder 15
A compression spring 23 is elastically supported on the rod protruding from the upper end, and the dog 18 is attached to the end of the rod protruding from the lower side of the cylinder.
It is adapted to be engaged with the recesses 19, 19 of both stopper pieces 14, 14 through the entrance/exit hole 16b at 6.

According to the device of the present invention, the lower mold (not shown) is provided on the fixed lower platen 2, while the upper mold (not shown) is provided on the slide platen 4.
In order to perform a series of molding operations such as opening and closing, mold clamping, molding, and taking out the molded product by raising and lowering the slide platen 4, the piston rod 15a of the drive cylinder 15 is advanced, and its dog 18 is moved against the end plate. By advancing into the recesses 19, 19 of the pair of stopper pieces 14, 14 through the entrance/exit hole 16b in the safety rod 16, they are closed by the tension spring 20. The pair of stopper pieces 14, 14 holding the tapered part 15a of the part 5 are expanded against the spring 20, and the holding by the arcuate notches 14a, 14a is released, and the slide platen 4 can be freely moved. By allowing the machine to move up and down, it can perform operations similar to conventional molding machines. Also, drive cylinder 1
The piston rod 15a of No. 5 is moved backward, and its dog 18 is inserted into the recess 1 of the pair of stopper pieces 14, 14.
9, 19, the pair of stopper pieces 14, 14 are automatically closed by the spring 20,
The arcuate recesses 14a, 14a clamp the tapered portion 5a of the engagement step portion 5, thereby preventing the slide platen 4 from moving up and down.
At this time, in order to drive the drive cylinder 15, as is well known, a safety door (not shown) installed on the outside of the mold clamping part of the molding machine so as to be openable and closable is used, and the safety door is closed. At the same time as the state is confirmed by a detection member such as a limit switch, the control circuit in the drive cylinder 15 is activated so that the piston rod 15a can advance and the slide platen 4 can be lowered by expanding the pair of stopper pieces 14, 14. On the other hand, when the safety door is opened, automatic control such as retraction of the piston rod 15a and prevention of movement of the slide platen 4 by closing the pair of stopper pieces 14, 14 can be easily performed. In the present invention, the safety rod 6 is not fixed to the fixed upper platen 1, but the upper end 6a of the safety rod 6 is connected to the piston rod 10 in the vertically moving cylinder 9 via the locking mechanism 11 of the rod 10. Since they are connected, the piston rod 10 can be moved up and down by movement of the piston rod 10 by the cylinder 9, and can be fixed at the moved position. Therefore, by making the movement stroke of the piston rod 10 in the cylinder 9 equal to or more than one pitch of the engagement step 5 in the safety rod 6, and by providing the lock mechanism 11 to allow vertical movement within one pitch. Therefore, the locking position (by the stopper pieces 14, 14) of the slide platen 4 on the safety rod 6 can be set arbitrarily, and it can be set with the minimum stroke required to open the mold, so the press cycle can be shortened. Moreover, it is extremely easy to change the upper and lower molds and change the stroke depending on the thickness of the mold. Further, a stopper 8 is provided on the slide platen 4 by a pair of clamping stopper pieces 14, 14, and a support mechanism 7 is provided on the upper platen 1 by a cylinder 9 for vertical movement and a piston rod 10 to restrain the safety rod 6. Since tensile stress is generated in the safety rod 6, the diameter of the safety rod 6 can be reduced, and a more compact structure is sufficient. Furthermore, since the cylinder 9 is equipped with a locking mechanism 11, it ensures that the safety rod 6 is fixed in its set position, and
If a special hydraulic cylinder such as a bear lock tube is used as the locking mechanism 11 as in the embodiment, the slip phenomenon (one pitch of the engagement step 5 at most) can be avoided even in the event of an emergency activation of the safety device.
This not only increases safety and durability by absorbing harmful impacts to the molding machine main body and the entire safety device, but also the structure of the safety rod 6 of the present invention: Slide platen 4
The locking operation is possible even when the slide platen 4 is descending, and during the movement stroke of the slide platen 4,
It can be stopped and locked at any position, and there is no need to insert a safety bar like in the past, and it is also possible for the operator to enter the machine.

As described above, the safety device of the present invention has a locking mechanism 11 at the upper end of the safety rod in the upper platen 1.
The combination of a vertically movable support by a vertically movable cylinder 9 equipped with a vertically movable cylinder 9 and a stopper 8 of a safety rod 6 provided on the slide platen 4 solves the drawbacks of the conventional fixed position locking system, and allows arbitrary setting of the locking position. It has excellent features in terms of increased safety, ease of operation, and convenience.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the device of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a side sectional view of the main parts of the device, and Fig. 4 is a front view of an embodiment of the device of the present invention.
The figure is an enlarged front view of the main part of the stopper, FIG. 5 is a side view of the same, FIG. 6 is a front view of the stopper piece, and FIG. 7 is a side sectional view of the main part of the stopper piece. 1... Upper platen, 2... Lower platen, 3
...Tie rod, 4...Slide platen, 5...
...Engagement stepped portion, 5a...Tapered portion, 6...Safety rod, 7...Support mechanism, 8...Stopper, 9...
Cylinder for vertical movement, 10...Piston rod,
11... Lock mechanism, 14, 14... Stopper piece, 15... Drive cylinder.

Claims (1)

[Claims for Utility Model Registration] A fixed lower platen 2 holding a lower mold, an upper platen 1 fixed above the lower platen 2, and a device disposed between the upper and lower platens 1 and 2. A vertical molding machine comprising a slide platen 4 which can be raised and lowered and which holds an upper mold, and a mold clamping part safety device for the upper and lower molds, wherein the upper platen 1 has a cylinder 9 and a cylinder 9 which can freely slide thereon. a lifting cylinder mechanism having a piston rod 10 fitted into the piston rod 10;
The upper end 6 of the safety rod 6 is provided with a support mechanism 7 consisting of a locking mechanism 11 for locking the safety rod 6, and a plurality of engagement steps 5 arranged at intervals in the longitudinal direction of the rod.
A is connected to the piston rod 10, and the safety rod 6 is extended downwardly so as to pass through the slide platen 4 in the vertical direction. A vertical molding machine having a mold clamping part safety device, characterized in that a stopper 8 is provided which engages with the engagement step 5 of the safety rod 6 when closed and allows the safety rod 6 to pass when opened.