JPS6142715Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that prevents a movable platen installed in a molding machine for molding resin or the like from falling.

A molding machine A shown in FIGS. 1 to 3 is an example of a conventional molding machine that pressurizes and molds resin such as FRP (glass fiber reinforced plastic) using a mold. This molding machine A includes a bed 1 equipped with a fixed plate (bolster) 1a on the upper surface to which a lower mold is attached, a side frame 2 erected on this bed 1,
2, a frame a consisting of a top plate 3 provided on top of the side frames 2, 2, a master cylinder 4 fixed to the top plate 3 with a piston rod 4a extending below the top plate 3, and the piston rod 4a. The main components are a movable platen 5 attached to the lower end and an upper mold attached to the lower surface thereof, and a fall prevention device 6 for the movable platen 5, which will be described later. A slide portion 5a is formed on the side of the movable plate 5 and is engaged with the side frame 2 in a vertically movable manner, and the movable plate 5 is moved along the side frame 2 by the vertical movement of the piston rod 4a. The upper die, which is movable up and down and is attached to the lower surface of the movable platen 5, is brought close to the lower die on the fixed platen 1a, and the pressurized object sandwiched between the upper die and the lower die is pressurized. It is now possible to perform molding using

By the way, the fall prevention device 6 has a pair of support plates 6a hanging down and arranged in parallel on the lower surface of the ceiling plate 3 above the movable platen 5, and a pair of support plates 6a arranged in parallel on the lower surface of the ceiling plate 3 above the movable platen 5, and the upper surface of the movable platen 5 located below these support plates 6a. Vertical safety block 6b
and a pin 6 attached to the tip of the piston rod 6c on the lower surface of the top plate 3 on the side of the support plate 6a.
The main body is a locking cylinder 6e that is fixed with the end d facing the support plate 6a.
Note that each support plate 6a has a piston rod 6.
A pin hole 6f into which the pin 6d can be inserted is formed coaxially with the extension of the central axis of the safety block 6b, and a support hole 6g into which the pin 6d can be inserted in the same direction as the pin hole 6f is formed in the safety block 6b. On the other hand, the safety block 6b is inserted between the support plates 6a, 6a at a predetermined raised position of the movable platen 5 separated from the fixed platen 1a, so that the pin hole 6f and the support hole 6g are at the same height. It is formed to be

In other words, the drop prevention device 6 locks the pin 6 by the locking cylinder 6e at a predetermined raised position of the movable platen 5.
d into the pin holes 6f of the support plate 6a and the support holes 6g of the safety block 6b, as shown in FIG. When this happens, the pin 6d supports the movable platen 5 and prevents the movable platen 5 from falling.

However, in the conventional drop prevention device 6, if the pin 6d is not removed from the pin hole 6f when the movable platen 5 is raised, the safety block 6b
There is a risk that the movable plate 5 may collide with the pin 6d.
When the movable platen 5 rises, the operator manually operates the cylinder 6d to ensure that the pin 6d is in the pin hole 6f, or detects the rise of the movable platen 5 and automatically operates the locking cylinder 6e to remove the pin. It is necessary to provide a pull-out mechanism for pulling out the pin 6d from the pin hole 6f, which poses a problem in that the operation is time-consuming or the pull-out mechanism complicates the structure. Moreover, in the case of the conventional fall prevention device 6, the movable platen 5 can be supported by the pin 6d only when the pin hole 6f and the support hole 6g are aligned.
Since the movable platen 5 can only be raised to a predetermined position, it cannot be prevented from falling while the movable platen 5 is rising, and there is a drawback that there is a risk of falling when the movable platen 5 is stopped in the middle of rising.

This invention is a molding machine equipped with a fixed plate to which a lower die fixed to the lower part of the frame is attached, and a movable plate to which the upper die is attached to the upper part of the frame so as to be movable up and down. A safety hook is provided with a locking protrusion on one side of the concavity between the board and the frame, and a hook part on the other side that locks the locking protrusion to stop the movable board from descending. The locking projection is provided so as to be relatively swingable from side to side between a locking position where the locking protrusion is locked to the safety hook and a release position where the locking protrusion is released from the safety hook, and to arrive at the locking position in a natural state; At least one of the locking protrusion and the safety hook is provided with a release mechanism for retracting at least one of the locking protrusion and the safety hook from the locking position to the release position; An inclined surface that presses at least one of the locking protrusions and the safety hook on one side when the movable plate is raised, and moves either the locking protrusion or the safety hook relative to the other by the upward movement force of the movable plate and retreats to the release position. By providing
This solution solves the above-mentioned conventional problems, and its purpose is to prevent the movable plate from falling over a wide area within the vertical movement range of the movable plate, and to raise the movable plate without performing any special operations. To provide a fall prevention device for a movable board which can automatically prevent the movable board from falling.

This invention will be explained below based on embodiments shown in the drawings.

Figures 4 to 6 show an example in which an embodiment of this invention is applied to molding machine B, and the same components as those of the conventional molding machine A shown in Figure 1 are given the same reference numerals. , their detailed explanation will be omitted.

A locking protrusion 10 is fixed to the side of the movable platen 5 of the molding machine B. This locking protrusion 10 is connected to the movable platen 5.
a base 10a protruding from the side surface of the base 10a;
It consists of a locking pawl 10b protruding from the upper side of the side remote from the movable plate 5 of a. The lower surface of this locking claw 10b is a substantially horizontal locking surface 10c, and the upper surface of the locking claw 10b is a sloped surface 10d that descends as it moves away from the movable platen 5.

Further, at the end of the lower surface of the top plate 3 and slightly beyond the tip of the locking claw 10b of the locking protrusion 10, there is a bracket fixed to the top plate 3;
A safety hook 12 whose upper end is pin-coupled to 11 is rotatable (swingable) in a vertical plane including the locking claw 10b, and a part of the rotation range of the safety hook 12 is connected to the movable plate 5. The locking protrusion 10 is provided so as to overlap with the upper part of the vertical movement range of the locking protrusion 10 due to the vertical movement. Then, a safety hook 12 facing the center side of the top plate 3 is provided.
On the side of the safety hook 12, a plurality of hook portions 12A (in this embodiment, four
) Projected. The upper surface of the hook portion 12A is made into a receiving surface 12a that faces almost horizontally with the safety hook 12 hanging down, and the upper surface of the hook portion 12A is
The lower surface of A is an inclined surface 12 that descends as it moves away from the center of the top plate 3 with the safety hook 12 hanging down.
b. Note that the safety hook 12 is in a natural hanging state with no external force applied to it, and the hook portion 12A is
The receiving surface 12a is disposed on the vertical movement surface of the locking pawl 10b as the movable platen 5 moves up and down, so that it reaches the locking position.

On the other hand, a release mechanism 13 is provided on the lower surface of the top plate 3 to rotate the safety hook 12 from a hanging position to a release position. This release mechanism 13 includes a hydraulic cylinder 13b horizontally attached to the lower surface of a base 13a fixed to the lower surface of a mounting plate on the side of the bracket 11, and a hydraulic cylinder 13b that sends oil to the hydraulic cylinder 13b to release oil inside the hydraulic cylinder 13b. It consists of a hydraulic cylinder control device (not shown) that moves the piston 13c. A roller 13e is attached to the tip of the piston rod 13d of the hydraulic cylinder 13b.
By letting out the piston rod 13d from the hydraulic cylinder 13b, the portion of the safety hook 12 below the rotational fulcrum is pushed, and the safety hook 12 is rotated in a direction in which the lower end of the safety hook 12 is brought out to the outside of the top plate 3. It's summery.

That is, the locking protrusion 10 and the bracket 11
The safety hook 12 and release mechanism 13 constitute a fall prevention device c.

Next, the operation of the fall prevention device c configured as described above will be explained.

When the movable platen 5 is to be raised, the safety hook 12 is first brought into a hanging state due to its own weight, and then the movable platen 5 is raised. Then, the movable plate 5 first pushes the inclined surface 12b of the hook portion 12A at the lower end of the safety hook 12 with its locking claw 10b, and moves up while slightly rotating the safety hook 12. Next, as the movable platen 5 rises, the locking pawl 10b engages the hook portion 12A.
When separated from the handle, the safety hook 12 hangs down again due to its own weight. When the movable plate 5 rises and the locking pawl 10b reaches the next hook portion 12A, the safety hook 12 is rotated again by the locking pawl 10b. As the safety hook 12 is rotated repeatedly, the movable plate 5 rises to a predetermined raised position.

By the way, even if the movable platen 5 tries to fall during the above-mentioned upward movement, the locking pawl 10b will catch on one of the hook parts 12A, and the movable platen 5 will be prevented from falling. That is, the safety hook 12 is designed to prevent the movable platen 5 from falling no matter what position the movable platen 5 is in when the locking claw 10b is positioned above the lowest hook portion 12A. There is.
Therefore, according to this invention, it is possible to prevent the movable board 5 from falling over a wider range than the conventional fall prevention device.

Note that when lowering the movable platen 5 that is locked by the safety hook 12, the hydraulic cylinder 13b
The piston rod 13d is extended, the safety hook 12 is rotated by the roller 13e at the tip of the piston rod 13d, and the hook portion 12A is moved to the locking claw 10.
b, release the locking by the safety hook 12, and then lower it.

According to this invention, it is only necessary to rotate the safety hook 12 by the hydraulic cylinder 13b when lowering the movable platen 5 which is prevented from falling by the safety hook 12, which is not necessary in the conventional device. This invention eliminates the need for the work of pulling out the pin 6d at the time of rising and the mechanism for pulling out the pin 6d at the time of rising, which has the additional effect of making the operation easier.

In this embodiment, four hook portions 12A are formed on the safety hook 12;
Any number of A may be formed on the safety hook 12 as long as it is one or more.

Figures 7 to 9 show a second embodiment of this invention, and the same components as those of the previous embodiment shown in Figures 4 to 6 are designated by the same reference numerals. A detailed explanation will be omitted.

In this embodiment, the shapes of the locking protrusion 10 and the safety hook 12 of the previous embodiment are slightly changed, and the mounting position of the hydraulic cylinder 13b is changed.
It is constructed by newly adding a first limit switch 15, a second limit switch 16, and a spring 17.

Locking protrusion 1 attached to the side surface of the movable board 5
0' is approximately L-shaped, consisting of a base 10A with a rectangular side surface and a locking protrusion 10B protruding from the lower surface of the tip of the base 10A, and the upper surface of the tip of the hook portion 12A of the safety hook 12'. An engaging protrusion 12c is formed on the movable plate 5, and there is a slight gap between the locking protrusion 10B and the engaging protrusion 12c when the movable platen 5 is at a predetermined raised position. Therefore, normally the locking protrusion 10B and the locking protrusion 12c do not engage with each other, but if the hydraulic pressure holding mechanism of the movable platen 5 stops working due to a failure of the hydraulic system or the master cylinder 4, the movable platen 5 will move slightly (by the gap). When it falls, the locking protrusion 10B and the locking protrusion 12c engage with each other and do not come off due to the rotation of the safety hook 12', thus providing a safe fall prevention device. If the engagement is to be disengaged, it must be returned to normal and raised to the normal raised position. Furthermore, an extending portion 1 is provided at a portion of the safety hook 12′ above the pivot portion supported by the bracket 11′.
2B is formed, and this extending portion 12B is biased by a spring 17 attached to the bracket 11' so as to bring the lower end of the safety hook 12' closer to the center side of the movable platen 5, and a hydraulic cylinder 13b
presses the extension portion 12B to release the safety hook 12'.
The safety hook 12' is mounted in a position where it can be pushed in a direction opposite to the biasing direction of the spring 17 (ie, in a direction in which the lower end of the safety hook 12' is pushed out of the top plate 3). The bracket 11' includes a first limit switch 15 that detects the hanging state of the safety hook 12', and a position where the hook portion 12A of the safety hook 12' is separated from the movable plate trace of the locking protrusion 10'. A second limit switch 16 for detecting the rotational position is attached. Note that this second
An electrical control circuit is constructed so that the next process of lowering the movable board 5 is started after electrically confirming that the safety hook 12' has been released by the limit switch 16.
There is no need to enter the lowering process with the
The safety hook 12' is prevented from being destroyed by the cylinder output during the downward stroke.

Furthermore, a signal from the first limit switch 15 is used to electrically confirm that the safety hook 12' is at the locking position. Furthermore,
A state in which the first limit switch 15 is not outputting a signal (a state in which the safety hook 12' is in the release position)
If a worker goes under the movable board 5, an alarm will be issued.

That is, in this embodiment, the locking protrusion 10', the bracket 11', the safety hook 12', and the release mechanism 1
3 constitutes a fall prevention device c'.

In this embodiment, the spring 17 holds the safety hook 12' in a suspended position and the hydraulic cylinder 13b
By pressing the extending portion 12B, the safety hook 12' is rotated to the release position. Note that the operation for preventing the movable platen 5 from falling will not be described because it operates almost the same as in the above-mentioned embodiment, but the operation and effect are almost the same as in the above-mentioned embodiment.

FIG. 10 shows a third embodiment of this invention. In this embodiment, an inverted F-shaped safety hook 120 is swingably provided on the side of the movable board 5, and is attached to the side of the side frame 2. This purpose is achieved by providing a locking projection 101 and forming an inclined surface 101d on the lower surface of the tip of the locking projection 101.

FIG. 11 shows a fourth embodiment of this invention. In this embodiment, an inverted F-shaped safety hook 121 is swingably provided on the side of the movable board 5, and a hook portion 121A of the safety hook 121 is Slanted surface 1 on the top surface of the tip
The purpose was achieved by providing 2b. Note that 102 is a locking protrusion provided on the side frame 2.

FIG. 12 shows a fifth embodiment of this invention. In this embodiment, an inverted F-shaped locking protrusion 103 is fixed to the side of the movable board 5, and a safety hook 122 is attached to the bottom surface of the top board 3. is swingably provided, and a safety hook 122 is installed.
An inclined surface 122b is provided on the bottom surface of the tip of the hook portion 122A.
The objective was achieved by forming the

FIG. 13 shows a sixth embodiment of this invention. In this embodiment, a spring 5c and a locking rod 104 are inserted into a recess 5b formed on the side surface of the movable plate 5, and the tip of the locking rod 104 is The safety hook 123 is swingably attached to the lower surface of the top plate 3, and three hook portions 123A are formed vertically on the safety hook 123, while the lower surface of the hook portion 123A is inclined. The purpose was achieved by making the surface 123b.

In addition, the swingable safety hooks 120, 121, 12 are also shown in FIGS. 10 to 13.
2, 123 is provided with a release mechanism, but it is omitted in the drawing.

As explained above, this invention is applicable to a molding machine equipped with a fixed plate which is fixed to the lower part of the frame body and to which the lower die is attached, and a movable plate which is attached to the upper part of the frame body so as to be movable up and down and to which the upper die is attached. , a safety hook having a locking protrusion on one of the movable platen and the frame, and a hook portion on the other side that locks the locking protrusion to stop the movable platen from descending; It is provided so that it can relatively swing from side to side between a locking position where the locking protrusion is locked to the safety hook and a release position where the locking protrusion is removed from the safety hook, and the locking position is reached in a natural state. Additionally, at least one of the locking protrusion and the safety hook is provided with a release mechanism for retracting at least one of the locking protrusion and the safety hook from the locking position to the release position; At least one of the safety hooks is provided with a locking protrusion and a safety hook that presses the other when the movable plate is raised, and uses the upward movement force of the movable plate to move one of the locking protrusions and the safety hook relative to the other and retreat to the release position. A sloped surface is provided, and by simply raising the movable plate,
Since the locking protrusion is configured to automatically lock onto the safety hook, the fall prevention function will not be impaired due to hydraulic system malfunction, etc., and it also prevents the movable panel from falling due to incorrect operation. Completely preventable. In addition, there is no need for the process of removing the pins when ascending, which was required in conventional equipment, and there is no risk of damage to mechanical parts due to forgetting to remove the pins, making it safer and easier to operate. be. Moreover, the safety hook is designed to prevent the movable board from falling even if the locking protrusion does not exactly match the position of the hook as long as it is above the hook, which is better than before. This has the effect of reliably preventing the movable plate from falling over a wide range without any restrictions.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a molding machine equipped with an example of a conventional fall prevention device, Fig. 2 is a sectional view showing a state in which the movable platen is prevented from falling by the fall prevention device shown in Fig. 1, and Fig. 3 is the same. 4 is a sectional view showing a molding machine equipped with an embodiment of this invention; FIG. FIG. 6 is a side view showing a state in which the fall prevention state of the movable board is released in the same embodiment;
7 to 9 show a fifth embodiment of this invention, in which FIG. 7 is a side view, FIG. 8 is a plan view of the main part, and FIG. 9 is a partially sectional front view. Fig. 10 is a block diagram of the third embodiment of this invention, Fig. 11 is a block diagram of the fourth embodiment of this invention, Fig. 12 is a block diagram of the fifth embodiment of this invention, and Fig. 13 is a block diagram of the fourth embodiment of this invention. It is a block diagram of the 6th Example of an invention. 1a... fixed plate (bolster), 5... movable plate,
B... Molding machine, 10... Locking protrusion, 10d... Inclined surface, 11... Bracket, 12... Safety hook, 12A... Hook portion, 12a... Reception surface, 12
b... Inclined surface, 13... Release mechanism, C, C'...
Fall prevention device, 10'... Locking protrusion, 11'... Bracket, 12'... Safety hook, 120... Safety hook, 101... Locking protrusion, 101d... Inclined surface, 121... Safety Hook, 121b... Slope, 102... Locking protrusion, 103... Locking protrusion,
122...Safety hook, 122A...Hook part,
104...Locking rod, 123...Safety hook,
123A...Hook part, 123b...Slope surface.

Claims (1)

[Scope of utility model registration request] In a molding machine equipped with a fixed plate fixed to the lower part of the frame and to which the lower die is attached, and a movable plate which is attached to the upper part of the frame so as to be movable up and down and to which the upper die is attached, the movable plate and the frame are attached. A safety hook is provided with a locking protrusion on one side and a hook portion on the other side that locks the locking protrusion to stop the movable board from descending. It is provided so as to be able to swing relatively left and right between a stop position and a release position where the locking protrusion is removed from the safety hook, and to arrive at the locking position in a natural state,
At least one of the locking protrusion and the safety hook is provided with a release mechanism for retracting at least one of the locking protrusion and the safety hook from the locking position to the release position. At least one of the locking protrusions and the safety hook is provided with an inclined surface that presses the other when the movable plate is raised and moves one of the locking protrusion and the safety hook relative to the other by the upward movement force of the movable plate and retreats to the release position. A fall prevention device for a movable platen in a molding machine, characterized in that it is provided with: