JPS5925633Y2 - Control device for restraint type mold clamping device of molding machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a control device for a restraint-type mold clamping device in an injection molding machine, and more specifically, based on the premise of a plurality of restraint receiving parts, the invention A control that can be modified so that the optimal engagement position (restrictor receiving part) can be selected at the same time by changing the position of the mold closing position confirmation means, and the restraining mechanism restrains and releases the selected restraint member receiving part. Regarding equipment.

(Background Art) As shown in FIG. 1, a restraint-type mold clamping device for an injection molding machine includes a movable platen 3 that moves forward and backward to open and close the mold by a high-speed moving cylinder 6, and a piston 31 that connects the A strong pressure mold clamping cylinder 30 that is connected to the movable platen 3 and moves forward and backward along the tie bar 5 together with the movable platen 3, and a strong pressure mold clamping cylinder 30 that is joined to the strong pressure mold clamping cylinder 30 at one end.
a restraint rod 14 that moves integrally with the restraint rod 14;
4 formed at a predetermined pitch P in the moving direction of the movable platen 3.
(However, it is not limited to 4.)

Must be two or more.

) of the restraining element receiving part 15... and the restraining element receiving part 15...
A restraint mechanism 28 has already been developed that allows the restraint member 12 to enter or leave a selected one of the following.

In the case of the restraint type mold clamping device having the above configuration, the fixed mold 27 attached to the fixed platen 4 and the movable mold 26 attached to the movable platen 3
When the mold thickness changes due to the mold change, the mold closing position of the movable platen 3 changes accordingly.

When the mold thickness change exceeds a certain level, the restraint mechanism 28
Since the restrainer 12 is installed on the fixed plate 29, the restrainer 12 is inserted from among the plurality of restrainer receivers 15 provided on the restraint rod 14 moving through the hole 29a of the second fixed plate 29. One of the restrainer receivers 15 at the appropriate position is selected again.

In other words, the restraining position (engaging position) must be changed.

In addition, the positions of the start and end points of the low-speed mold closing and mold opening strokes of the movable platen 3 also change.

Therefore, when changing the mold, the positions of the control device elements 17, 21, 18, 23, 17, and 22 must be accurately and quickly corrected based on the change in mold thickness.

Conventionally, the positional modification of the control device elements as described above is
Each time the mold is changed, after confirming the mold closing state of the movable platen based on the change in mold thickness, the position is measured using a measuring tool, etc., and then the engagement position between the restraint element and the restraint element receiving part is determined. In addition, the low-speed mold closing and mold opening stroke positions are also determined, and then the elements of the respective position confirmation means are moved to the corresponding positions.

In other words, the conventional method is a manual process that relies on the skilled skills and knowledge of staff members, requiring troublesome procedures and complicated operations, and takes a lot of time.

However, it was still easy to make mistakes due to misidentification.

(Purpose of the invention) Therefore, the purpose of this invention is to move the element for confirming the mold closing position of the movable plate to a predetermined position, to confirm the engagement position or the element for confirming the low-speed mold closing or mold opening stroke position. It is an object of the present invention to provide a control device for a restraining type mold clamping device which is improved in structure so that the relocation or selection of the objects can be performed integrally, accurately, simply and quickly.

(Structure and Effects of the Invention) In order to achieve the above object, the control device of the invention includes a set bar in the form of a long and thin rod that is installed on the frame of the molded plate so as to be movable in the moving direction of the movable platen. The mold closing position confirmation means consists of a pair of a cylinder and a position transmitting element, and gives a stop command signal to the high-speed moving cylinder, and at the same time gives a strong pressure mold clamping command signal to the strong pressure mold clamping cylinder to switch the functions of both. , one element of which is mounted on a movable platen and the other element on a set bar in such a manner that each element can be located relative to the other.

Similarly, the engagement position confirmation means, which is composed of a pair of a signal device and a position transmitting element, is used to apply a forward restraint command signal to the restraint cylinder of the restraint mechanism to achieve complete restraint. Then, the other element is mounted on the frame of the molded plate, and at least the same number as the arrangement pitch of the restrainer receiving part in the relocation direction of the set bar, and the surface elements are arranged so that their positions can be confirmed with each other. ing.

Of the engagement position confirmation means, the element attached to the frame of the molded plate is disposed so as to be freely displaceable between a state in which the position can be confirmed and a state in which the position cannot be confirmed with respect to the other element. Install a separate cam follower.

On the other hand, the set bar is provided with a linear-acting cam in the shape of a concave over a certain length range at a certain distance from the element mounted on the set bar among the mold closing position confirmation means, and the linear-acting cam and the element are connected to each other. The cam follower is in contact with the cam follower.

Note that the signal device constituting the position confirmation means is specifically a limit switch, a microswitch, a proximity switch, a potentiometer, etc.

On the other hand, the position transmitting element corresponds to, for example, a protrusion that pushes the input terminal of a limit switch, a non-contact magnet piece in the case of a proximity switch, and a movable terminal or a part that moves it in the case of a potentiometer.

Therefore, according to this invention, when the mold is changed from a thin mold to a thick mold or vice versa, and the mold closing position of the movable platen changes, the mold closing state of the movable platen is checked, and
While maintaining this state, the set bar is moved to a position where the mold closing position transmitting element activates the mold closing position confirmation signal and is fixed at that position.

This means that the position of the mold closing position confirmation signal device has been newly determined.

At the same time, the direct-acting cam provided on the setper moves in the same direction and by the same dimension, and comes into contact with the cam follower of the engagement position transmission element at the position corresponding to the newly determined mold closing position of the movable platen. This is the only state in which the locked position can be confirmed (in other words, the state in which the signal can be activated)
becomes.

Therefore, the locking position transmission element selects a new restraint receiving part at the appropriate position where the restraint should enter and restrain, corresponding to the change in the mold closing position, and as a result, the locking position is determined. become.

Therefore, for example, when relocating the set bar, a means is provided to connect the set bar and the movable plate in a certain relationship, and the means is used to connect the two, and then the movable plate is moved slightly so that the mold is confirmed to be closed. If configured to be driven, the position of the set bar will be automatically determined when the closed state of the mold is confirmed, which is convenient.

In this way, each control target position of the control device can be changed or selected simply by changing the position of the set bar as the mold thickness changes during mold change, and can be done easily, accurately, and quickly. Enables optimal control.

Furthermore, it is possible to reduce the impact between the molds when the mold is closed, thereby preventing damage to the molds and a reduction in their useful life.

(Example) Next, the illustrated embodiment will be explained.

In FIGS. 1 and 2, 21 is a mold closing position confirmation signal device constituting the mold closing position confirmation means, and 22 is a low speed position confirmation signal device. It is fixedly mounted on the top at a predetermined distance S'.

In the figure, reference numeral 23 denotes an engagement position confirmation signal device constituting the engagement position confirmation means, which is also a limit switch, and is attached downward to the bottom surface of the strong mold clamping cylinder 30.

Four (but not limited to four) formed as mere protrusions relative to the limit switch.

At least the same number as the restrainer receivers 15. ) are attached to the front part of the frame 1 of the molding machine at a pitch R' that is the same as the arrangement pitch P of the restrainer receivers 15 in the moving direction of the setter 24. It is being

By the way, the setter 24 has a substantially rectangular cross section (Fig. 2).
It has a long and straight rod shape with a uniform cross section, and is slidably passed through a short guide sleeve 32 in the shape of a rectangular cylinder fixed to the upper part of the frame 1 of the molding machine, and is cantilevered by the guide sleeve 32. It is set up in the form.

Therefore, this setter 24 can be moved parallel to the moving direction of the movable platen 3 as long as it slides inside the guide sleeve 32.

In the figure, reference numeral 37 denotes a set screw 37 provided in the guide sleeve 32 for fixing the setter 24 at an arbitrary position in the guide sleeve 32.

The mold closing position confirmation signal 21 is connected to the setter 24.
It is fixedly attached to the right end in the figure.

This signal device 21 is operated by the mold closing position transmitting element 17 fixedly attached to the bottom of the movable platen 3, and is arranged and in a posture that generates a signal, that is, the input terminal of the limit switch is sufficiently connected to the transmitting element 17. It is installed in a position and attitude that makes contact.

On the other hand, the low-speed position confirmation signal 22 for confirming the range of the low-speed mold closing or mold opening stroke of the movable platen 3 is located at a position closer to the mold opening direction by a certain distance S' from the mold closing position confirmation signal 21. Mold closing position transmission element 1 of movable platen 3
7 and is installed in a position and attitude that allows it to be activated and generate a signal.

Note that the distance S' corresponds to a stroke for moving the movable platen 3 at a low speed, and is appropriately determined based on the performance of the molding machine, molding conditions, and other factors.

Therefore, since this distance S' needs to be adjusted, the low-speed position confirmation signal device 22 is mounted on the setper 24 so that it can be moved over a certain range and its position can be fixed.

By the way, as shown in FIG. 2, the locking position confirmation signal device 23 constituting the engagement position confirmation means is attached to a mounting seat 3 that protrudes forward from the bottom of the front side of the strong pressure mold clamping cylinder 30.
It is attached downward to 0a.

On the other hand, the four engagement position transmitting elements 18 are all prismatic, with the tops shaped like tapered pyramids, and are brought into contact with the front surface of the molding machine frame 1 and fixed. Each of the recesses 34a of the support body 34 is arranged so as to be able to move up and down independently only in the up and down direction.

Each of the engagement position transmitting elements 18 is arranged so that it can contact the engagement position confirmation signal device 23 and transmit the signal, and is arranged in a line in the mold opening direction of the movable platen 3. has been done.

That is, the four engagement position transmitting elements 18... are connected to the setter 24 at positions close to the setper 24.
They are attached at a pitch P' equal to that of the restrainer receiving portions 15 in the movement direction of the restrainer receiving portions 15 .

Each engagement position transmitting element 18... is constantly pushed upward by a compression spring 33 installed at the bottom of each recess 34a of the support body 34.

Each engagement position transmitting element 18... is connected to a setper 24
It has a cam follower 35 that protrudes toward.

Each cam follower 35 is in contact with the bottom surface of the setter 24.

That is, as long as the cam follower 35 is in contact with the bottom surface of the setter 24, the upper end of each engagement position transmitting element 18 is held at about the same height as the upper surface of the setter 24.

Therefore, it never comes into contact with the fixed position confirmation signal device 23 and does not perform a transmission operation.

On the other hand, on the bottom of the setter 24, at a certain distance from the mold closing position confirmation signal 21, there is a direct-acting cam 36 which is installed at a certain depth over a certain length range to prevent indentation of the required depth. It is formed as a thing.

The above-mentioned certain distance means, for example, when a mold with the minimum mold thickness is used as an applicable range and the movable platen 3 is in the mold closing state, the distance from the mold closing position confirmation signal 21 to the right-hand position of the mold in FIG. This is the distance from the engagement position transmitting element 18 to the cam follower 35.

In addition, the above-mentioned required depth (depth of the direct-acting cam 36) means that the engagement position transmitting element 18 of the cam follower 35 that is in contact with this is pushed up by the compression spring 33 and comes into contact with the retention position confirmation signal device 23. The depth is high enough to activate the transmission.

Furthermore, the above-mentioned fixed length range (the length of the linear-acting cam 36) means that only the cam follower 35 of the position transmitting element 18 that corresponds to the restrainer receiving portion 15 with which the restrainer 12 engages is connected to the linear-acting cam 36. Although it is not necessary to have an extremely narrow configuration in contact with
However, the length of the corresponding cam follower 35 is such that it can smoothly and reliably come into contact with the direct-acting cam 36, or it has a length that includes an inclined portion that allows the cam follower 35 to enter and exit smoothly.

The length is also such that at least the cam follower 35 on the left in FIG. 1 does not contact the linear drive cam 36 at the same time.

In other words, the direct-acting cam 36 extends its length from a certain distance away from the mold closing position confirmation signal 23 to the left in FIG.
Although it is not permitted to expand the length to the right side in Fig. 1, for example, to the position ■ shown by the dotted line in the figure, or to the right end @ of the set par 24, I don't mind enlarging it.

This is because the locking position transmitting element 18 on the right side of the locking position transmitting element 18 (for example, the third one from the left in FIG. 1) that corresponds to the restraint receiving part 15 with which the restrainer 12 engages
Even if the cam follower 35 (the fourth one from the left in FIG. 1) contacts the direct-acting cam 36 and the engagement position transmitting element 18 is raised, the locking position confirmation signal attached to the strong pressure mold clamping cylinder 30 This is because the device 23 never moves to the right until it comes into contact with the engagement position transmitting element 18.

As mentioned above, when the mold is changed from a thin mold to a thick mold or vice versa, and the mold closing position of the movable platen 3 changes to the left or right by the difference in mold thickness, first set the mold. After loosening the set screw 37 of the setter 24 and confirming the mold closing state of the movable platen 3, move the setter 24 to a position where the mold closing position transmitting element 17 transmits the mold closing position confirmation signal 21. Fix it again.

By the above-described operation, the linear cam 36 also moves in the same direction and by the same dimension as the setter 24, so that the locking position transmitting element 1 is in a relationship corresponding to the new mold closing position of the movable platen 3.
The cam follower 35 of No. 8 comes into contact with the direct-acting cam 36.

Therefore, the locking position transmitting element 18 is selected as being in an appropriate position with respect to the change in the mold closing position, and as a result, a new restraint receiving portion 15 (locking position) with which the restraint member 12 engages is determined. That means that.

As a result, when the molding machine performs a mold closing process from the mold open state, for example, the high-speed moving cylinder 6 first starts low-speed mold closing of the movable platen 3, and the position transmitting element 16 of the movable platen 3 transmits the stop position confirmation signal. 20 and the low-speed position confirmation signal 19, the signal from the signal 19 switches to high-speed type closing.

Immediately before the end of the high-speed mold closing stroke, when the mold closing position transmitting element 17 attached to the lower surface of the movable platen 3 reaches the low-speed position confirmation signal 22 and activates the transmission, the signal transmitted by the signal 22 is activated. The high-speed moving cylinder 6 is switched to low-speed mold closing.

Furthermore, the piston of the restraint cylinder 10 in the restraint mechanism 28 is slightly advanced by the signal from the signal device 22, so that the front end surface of the restraint member 12 comes into contact with the outer diameter surface of the restraint rod 14.

For the restrainer 12 waiting in this state, the strong pressure mold clamping cylinder 3
The restraint receiving part 15 (the second one from the left in FIG. 1) at the corresponding position provided on the restraint rod 14 that moves with the restraint rod 14 reaches the position of the restraint 12, and first the notch 12 at the tip of the restraint 12 a comes into contact with the outer diameter surface of the restraining rod 14, and the remaining convex portion falls into the restraining element receiving part 15, and the restraining element receiving part 1
The rear wall surface 15 a of 5 contacts the rear wall surface of the restrainer 12 to stop the movement of the restraint rod 14 , and as a result, the strong pressure mold clamping cylinder 3
Stop the movement of 0.

At the same time, the locking position confirmation signal 23 of the strong pressure mold clamping cylinder 30 comes into contact with the locking position transmitting element 18, and the piston rod 11 of the restraining cylinder 10 is Moved forward again and restraint 12
completely enters into the restrainer receiving portion 15 and completes the restraint.

On the other hand, when the movable platen 3 reaches the mold closing position, the mold closing position confirmation signal 21 indicates that the mold closing position transmitting element 1 of the movable platen 3 has reached the mold closing position.
7 has arrived and is confirmed by activating the mold closing position confirmation signal 21.

The high-speed moving cylinder 6 is stopped by the signal input,
On the other hand, pressure oil is supplied to the rear chamber of the piston of the strong-pressure mold clamping cylinder 30 to bring the mold into a clamped state, and injection molding of molten resin is performed while maintaining this clamped state.

(Other Examples) Contrary to the above example, the mold closing position transmitting element 17 is attached to the setter 24, and the signal device 21.2 is attached to the movable platen 3.
2, one locking position transmitting element 18 is attached to the strong pressure mold clamping cylinder 30, and a plurality of signal devices 23 are attached to the frame 1 of the molding machine, the same effect as described above can be obtained. be done.

[Brief explanation of the drawing]

The drawings show the control type roll device of this invention applied to a restraining type mold clamping device of a molding machine, and FIG. 1 is a partially cutaway front view, and FIG. FIG.

Claims (1)

[Claims for Utility Model Registration] A movable platen 3 whose mold opening/closing is advanced and retreated by a high-speed moving cylinder 6, and a piston 31 that moves the movable platen 3 forward and backward to open and close the mold.
and moves forward along the tie bar 5 together with the movable plate 3,
The strong pressure mold clamping cylinder 30 is retreated, the restraint rod 14 is joined at one end to the strong pressure mold clamping cylinder 30 and moves integrally with the strong pressure mold clamping cylinder 30, and the restraint rod 14 is moved in a predetermined direction in the moving direction of the movable platen 3. A plurality of restraint receiving portions 15 formed at a pitch P, and a restraining member 12 in the restraint receiving portion 15.
In a control device for a restraint-type mold clamping device comprising a restraint mechanism 28 for entering and leaving the machine, (a) an elongated bar-shaped setper 24 is movable in the moving direction of the movable platen 3 on the frame 1 of the molding machine; (b) A mold closing system which sends a stop command signal to the high-speed moving cylinder 6 and a strong pressure mold clamping command signal to the high pressure mold clamping cylinder 30 by warning from a pair of signal device 21 and position transmitting element 17. The position confirmation means is such that one element 17 is attached to the movable platen 3 and the other element 21 is attached to the setter 24 in such a manner that both elements 17 and 21 can mutually confirm their positions, (c) Engagement position confirmation means warns from a pair of a signal device 23 and a position transmitting element 18 and gives a restraining command signal to a restraining mechanism 28, one element 23 is connected to a strong pressure mold clamping cylinder 30, and the other element 18 is connected to a molding cylinder 30. On the frame 1 of the machine, both elements 18.
23 are attached in such a way that their positions can be confirmed with respect to each other; Each element 18 is provided with a cam follower 35, which is displaceable between a confirmable state and an unconfirmable state. Set par 2 of closed position confirmation means
A linear-acting cam 36 having a concave shape of a certain height is provided at a position a certain distance from the element 21 attached on the linear-acting cam 3.
6 and the cam follower 35 of the element 18 (above) are brought into contact with each other.