JPH1052841A - Mold clamping apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fixedly connect a transmission member to clamp a movable board via the member in a short time by simplifying a connecting means of a mold clamping apparatus to reduce it in size. SOLUTION: A connecting means has chucking members 33, 34 formed of so-called split half nut-like states, a single chucking cylinder 35 for moving the one member 33, and an interlocking means 40 for moving the other member 34 in cooperation with the member 33. The means 40 has an operating lever 70 provided at the member 33, link members 76, 74, 77 pivotally secured to the lever 70, and a bracket 76 for coupling the member 77 to the member 34. When the member 35 is moved by the drive of the cylinder 33, the member 34 is moved in cooperation with it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device for an injection molding machine, and more particularly, to a mold opening / closing means for quickly moving a movable plate toward and away from a fixed plate, and to a fixed plate and a movable plate. Pressing means for pressing the mounted mold, a transmitting member for transmitting the pressing force of the pressing means to the movable platen,
The present invention relates to a mold clamping device provided with a coupling means for coupling and fixing a transmission member so that a movable platen can be clamped via a transmission member.

[0002]

2. Description of the Related Art Conventional mold clamping devices for injection molding machines include:
As disclosed in Japanese Patent Publication No. 45-39955, a fixed plate and a pressing cylinder are arranged to face each other, and a movable plate is slidably inserted into a tie bar connecting the fixed plate and the pressing cylinder. Then, a side cylinder is provided as a mold opening / closing means for quickly moving the movable plate close to and away from the fixed plate, and a transmission rod is provided on the compression cylinder side of the movable plate,
It is known that an engaging portion is formed on the transmission rod, and a chuck cylinder for moving an engaging element which can be engaged with the engaging portion is moved forward and backward. In this mold clamping device, the engaging member is constituted by a pair of engaging members so as to sandwich the engaging portion of the transmission rod, and is used for a chuck for moving the engaging member forward and backward. A pair of cylinders is also provided. Further, a hollow portion through which the transmission rod can be inserted is formed in the piston body of the compression cylinder.

In this mold clamping device, a mold is attached to each of the opposing surfaces of a fixed plate and a movable plate, and the movable plate is quickly moved close to the fixed plate by a predetermined distance by driving a side cylinder. The engaging element is engaged with the engaging portion of the transmission rod by the extension drive of the chuck cylinder, and the movable platen and the pressing cylinder are connected and fixed, and the clamping force of the pressing cylinder is applied to the movable plate via the transmitting rod. Transmit and tighten. Also, when the molding is completed, the mold is opened by the pressing cylinder, the engagement of the transmission rod of the momenting member to the engaging portion is released by the retraction drive of the chuck cylinder, and the movable platen is moved by the side cylinder to the fixed platen. Is quickly separated. At this time, the transmission rod is inserted into the hollow portion of the compression cylinder.

Further, as another conventional mold clamping device, as disclosed in Japanese Patent Application Laid-Open No. 48-39550, a mold opening / closing apparatus for moving a movable plate quickly toward and away from a fixed plate. A first hydraulic device provided as a means,
A second hydraulic device for performing a releasing operation, a restraining member disposed on the pressing cylinder and moving forward and backward by the hydraulic cylinder,
A compression column that engages with the restraining member when the restraining member advances and transmits the pressing force of the pressing cylinder to the movable platen; and the pressing cylinder has a hollow portion through which the compressing column can be inserted. Things are known. When the pressing force is released, the compression cylinder has a compression spring that urges the engagement member so that the engagement surface pressure between the engagement member and the compression column is eliminated so that the engagement member can be retracted by the hydraulic cylinder. Is provided. And even with this mold clamping device,
As in the case of Japanese Patent Application Laid-Open No. 9955, a restraining member divided into a pair is employed, and therefore, a pair of hydraulic cylinders for moving the restraining member forward and backward are also provided.

In this mold clamping device, the movable column is moved closer to the fixed plate by driving the first hydraulic device, and the compression column is positioned so as not to hinder the movement of the restraining member. The pair of restraining members are moved forward so as to approach each other, and the free ends of the compression columns are engaged by the restraining members so that the compression columns cannot be retracted into the hollow portions of the compression cylinders. Pressure is transmitted to perform pressure clamping. Also, when the molding is completed, the pressing force of the compression cylinder is released, the engagement surface pressure between the restriction member and the compression column is eliminated by the biasing force of the compression spring, and the pair of restriction members are separated from each other by the hydraulic cylinder. The movable platen is separated from the fixed platen by being retracted, released by the second hydraulic device, and driven by the first hydraulic device.

Further, as another conventional mold clamping device, as disclosed in Japanese Utility Model Laid-Open Publication No. Sho 50-36468 and Japanese Utility Model Laid-Open Publication No. Hei 5-74825, a single blocking plate or lock plate is used. There is also known a mechanism in which a mechanical ram or a rear end of a connection shaft is connected to and fixed to a high-pressure pressing ram or a mold clamping ram so as not to retreat by being moved by one hydraulic jack or cylinder.

[0007]

Among the above prior arts, in the mold clamping device disclosed in Japanese Patent Publication No. 45-39955, the engaging portion of the transmission rod is fitted by a pair of engaging members. In this case, it is necessary to provide chuck cylinders for moving the respective engaging elements forward and backward.

Further, even in the mold clamping device disclosed in JP-A-48-39550, the above-mentioned JP-B-45-39595 is disclosed.
As in the case of Japanese Patent Application Laid-Open No. 5 (1999) -1995, it was necessary to provide hydraulic cylinders for moving each restraining member forward and backward.

Further, in the above-mentioned two prior arts provided with the pair of anchors and the like, particularly in the mold clamping device disclosed in Japanese Patent Publication No. 45-39955, a circuit is connected in parallel to each cylinder. Even if the working fluid is supplied to each cylinder at the same time, each mooring member does not move at the same time due to the resistance of the mooring member, so that each mooring member is synchronized with the mooring portion of the transmission rod. And could not be locked.

Further, in the mold clamping device disclosed in Japanese Utility Model Laid-Open No. 50-46868 and Japanese Utility Model Laid-Open No. 5-74825, a single blocking plate or the like is moved by a single hydraulic jack or the like. As the mechanical ram, etc. is connected and fixed to the high-pressure pressing ram, etc. irreversibly, the movement stroke of a single blocking plate etc. becomes large, and the mechanical ram, etc. and the high-pressure pressing ram, etc. are connected and fixed. Alternatively, there has been a problem that it takes an operation time to cancel.

Further, in order to engage and disengage an engaging member such as an anchor, a restraining member or a blocking plate with a transmitting member such as a transmission rod, a compression column or a mechanical ram, a hydraulic cylinder or a hydraulic cylinder is required. Since a certain amount of output is required for a moving means such as a jack, there is a problem that the size of the mold clamping device is increased, and thus a large space is required for the enlarged mold clamping device.

A first object of the present invention is to solve the above-mentioned prior art. A first object of the present invention is to reduce the size of the mold clamping device by using a simple coupling means and to reduce the size of the engaging member. An object of the present invention is to provide a mold clamping device capable of engaging and disengaging a transmission member in a short time.

A second object of the present invention is to solve the above-mentioned prior art, and a second object of the present invention is to make an engaging member adhere to a transmission member in synchronization with the transmission member. It is an object of the present invention to provide a mold clamping device that can be engaged and moved.

Further, the present invention has been made to solve the above-mentioned conventional technology, and a third object of the present invention is to provide a moving means for engaging and disengaging an engaging member with a transmitting member. An object of the present invention is to provide a mold clamping device that does not require a large output.

[0015]

Means for Solving the Problems In order to achieve the first object, the invention according to claim 1 is a mold opening / closing means for moving a movable plate so as to quickly move toward and away from a fixed plate, Pressing means for pressing a mold attached to the fixed plate and the movable plate, a transmission member for transmitting the pressing force of the pressing means to the movable plate, and pressing the movable plate via the transmission member. In a mold clamping device having a coupling means for coupling and fixing the transmission member so that the transmission member can be coupled and fixed to the transmission member by engaging with the transmission member, A single moving means for moving one of the engaging members to engage and disengage with the transmission member, and interlocking with the engaging member moved for engaging and disengaging by the moving means To engage and disengage the other It is characterized in that it has a an interlocking means for moving the.

According to a second aspect of the present invention, in order to achieve the second object, in the first aspect of the invention, the interlocking means is synchronized with the engaging member engaged and moved by the moving means. And adjusting means for adjusting the other engaging member so as to be brought into close contact with the transmitting member.

Further, in order to achieve the third object,
According to a third aspect of the present invention, in the invention described in any one of the first and second aspects, the moving means for engaging and disengaging one of the plurality of engaging members is provided with respect to the transmitting member. It is characterized in that one engaging member is moved in a substantially vertical direction.

According to the first aspect of the invention, the movable platen is quickly moved to the predetermined position by the mold opening / closing means to the predetermined position, and one of the plurality of engaging members is transmitted by the moving means of the coupling means. Move to engage the member. At this time, the other engaging member is moved by the interlocking means so as to be engaged with the transmitting member in conjunction with the one engaging member moved by the moving means. When the transmitting member is connected to the movable platen, the transmitting member and the pressing means are connected and fixed, and when the transmitting member is connected to the pressing means and the pressing means is provided on the movable platen. In this method, the clamping force of the clamping means is transmitted to the movable plate through the transmission member by coupling and fixing the transmission member and the fixed platen to clamp the fixed platen and the mold attached to the movable platen. Becomes possible.

When the molding is completed, one of the plurality of engaging members is moved so as to be released from the transmitting member by the moving means of the connecting means. At this time, the other engagement member is moved by the interlocking means so as to be released from the transmission member in conjunction with one of the engagement members moved by the moving means.
When the transmission member is released from the connection with the pressing means or the fixed board, the movable board is quickly moved away from the fixed board to a predetermined position by the mold opening / closing means.

According to the second aspect of the present invention, the other engaging member which is engaged and moved in conjunction with the one engaging member is synchronized with the one engaging member by the adjusting means and is transmitted to the transmitting member. And are engaged so as to be in close contact with each other without any gap.

According to the third aspect of the present invention, when one of the engaging members is moved in a substantially vertical direction by the moving means, the one engaging member and the other engaging member act so that their own weights are balanced. And the large output of the moving means is not required.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mold clamping apparatus according to the present invention will be described with reference to FIGS. In the drawings, the same reference numerals denote the same or corresponding parts.

As shown in FIG. 1, the mold clamping apparatus according to the present invention comprises a fixed platen 1, a movable platen 2 opposed to and fixed to the fixed platen 1, and moved toward and away from the fixed platen 1, and a movable platen. And a side cylinder 4 as a mold opening / closing means for quickly moving the movable platen 2 toward and away from the fixed platen 1.
A main cylinder 7 as a means for pressing the dies 5 and 6 attached to the opposing surfaces of the fixed plate 1 and the movable plate 2, respectively; and a transmission member for transmitting the pressing force of the main cylinder 7 to the movable plate 2 And coupling means 9 for coupling and fixing the transmission members so that the dies 5 and 6 attached to the fixed platen 1 and the movable platen 2 via the transmission members can be pressed. In this embodiment, the main cylinder 7 is provided on the movable platen 2, and the extension 10 of the piston rod 8 of the main cylinder 7 is formed to extend toward the fixed platen 1. Constitutes a transmission member for transmitting the pressing force of the main cylinder 7 to the movable platen 2. The piston rod 8 has a hollow portion 11 in its axial direction.
Is formed, and the tie bar 3 is inserted through the hollow portion 11. Further, coupling means 9 for coupling and fixing the piston rod 8 is provided on the fixed platen 1 so that the movable platen 2 can be clamped via the piston rod 8.

The fixed platen 1 is fixed on a machine base (not shown) and has a substantially rectangular shape, and has a nozzle (not shown) of a molding material injection device in the center. A tapered hole 15 is formed to insert the hole. The movable platen 2 is formed in a substantially rectangular shape so as to be aligned with the fixed platen 1. The main cylinder 7 is provided on the side opposite to the fixed platen of the corner of the movable platen 2, and the tie bar 3 is inserted into the hollow portion 11 of the piston rod 8 of the main cylinder 7, so that the movable platen 2 becomes a fixed platen. It is moved toward and away from it in a state where it is arranged to face the other. As shown in FIG. 3, the tie bar 3 has one end fixed to a corner of the fixed platen 1 by a nut 16 and the other end attached to a support plate 17 provided on a machine base. As shown in FIG. 1, the movable platen 2 is provided with an ejector mechanism 18, and the movable mold 6 is provided with an ejector pin 19 for projecting a product.

In this embodiment, as shown in FIGS. 1 and 3, a pair of side cylinders 4 are supported by a bracket 20 provided on the side of the fixed platen 1, and a piston rod 22 is provided. It is connected to the movable platen 2. The side cylinder 4 has a smaller diameter and a longer stroke than the main cylinder 7, and the two cylinder chambers 4a and 4
b drives the piston rod 22 to extend and retract,
The pressure oil of the hydraulic pressure source is switchably supplied via the switching valve (the switching valve and the hydraulic pressure source are not shown).

The main cylinder 7 has a larger diameter and a shorter stroke than the side cylinder 4.
As shown in FIG. 2, the extension 10 of the piston rod 8 serving as a transmission member for transmitting the pressing force of the main cylinder 7 to the movable platen 2 is formed to have a predetermined length, In the portion, a plurality of engagement grooves 25 are formed in the circumferential direction to be engaged with protrusions 60 of chuck members 33 and 34 described later. Further, a cam 26 is attached to the distal end surface of the extension 10.

As shown in FIG. 1, when the movable platen 2 is moved closer to the fixed platen 1 by driving a pair of side cylinders 4, the piston rod 8 of each main cylinder 7 is moved to the fixed platen 1. Through holes 30 each having a diameter that allows the extension portion 10 to be inserted are formed. And the extension 10
The connecting means 9 for connecting and fixing the
Are provided on the side opposite to the movable platen of each through hole 30.

As shown in FIG. 4, in the case of this embodiment, each connecting means 9 is a so-called half-nut-shaped divided into two engaging members capable of engaging with the engaging groove 25 of the extension portion 10. , A chuck cylinder 35 as moving means for engaging and releasing one of the chuck members 33 with respect to the engagement groove 25, and engaging with the chuck cylinder 35. And interlocking means 40 for engaging and releasing the other chuck member 34 with the engagement groove 25 in conjunction with the chuck member 33 to be released.

As shown in FIGS. 1 and 2, a housing 45 having an end plate 45a is attached to the fixed platen 1 on the side opposite to the movable platen where the through holes 30 are formed. One end is inserted into the end plate 45a, and the nut 16 is screwed. This housing 4
5, chuck members 33 and 34, chuck cylinder 3
5 and an interlocking means 40 are provided. Further, the housing 45 is provided with limit switches 46 and 47 so that the cam 26 attached to the distal end of the extension 10 of the piston rod 8 is actuated by abutment at a predetermined position. When the piston rod 8 is driven to extend, the cam 26 attached to the distal end surface of the extension 10 abuts on the end plate 45a. Thereby, the engagement groove 25
Are positioned so that they can engage with the chuck members 33 and 34.

As shown in FIG. 4, in the case of this embodiment, the support plates 4
8 and 49 are mounted, and grooves 50 for slidably guiding the two chuck members 33 and 34 are provided above and below the housing 45.
Are formed. A single chuck cylinder 35 is supported by one support plate 48 so as to move one chuck member 33 in the left-right direction in the drawing. A bolt 5 is attached to the tip of the piston rod 35a of the chuck cylinder 35.
5 is screwed, and a holding ring 56 divided so as to press the head of the bolt 55 is attached to the chuck member 33, so that the piston rod 35a of the chuck cylinder 35 and the chuck member 33 are connected. The chuck member 3 is provided in front of and behind the chuck cylinder 35.
Proximity switches 57 and 58 for detecting the forward limit and the backward limit of the piston rod 35a are provided as sensors for confirming engagement or disengagement of the third engagement groove 25, respectively.

The chuck members 33 and 34 engage with the engagement groove 25 of the piston rod so as to engage over the entire circumference of the engagement groove 25 of the extension 10 (see FIGS. 1 and 7).
And FIG. 8) are formed on the inner peripheral surface. In this embodiment, the case where the engagement groove 25 is formed in the extension 10 and the protrusion 60 is formed in the chuck members 33 and 34 has been described. However, the present invention is not limited to this. A ridge is formed on the extension part 10, and the chuck member 33,
An engagement groove can also be formed in 34.

The other chuck member 3 is operated in conjunction with the chuck member 33 moved by driving the chuck cylinder 35.
As shown in FIG. 4, the interlocking means 40 for moving the moving member 4 is provided on one of the chuck members 33, and the operating rod 70 is inserted through the other of the chuck members 34.
A link mechanism for linking the operation of the operating rod 70 to the other chuck member 34 is provided. A pair of operating rods 70 are attached to one chuck member 33 by bolts 71, and a hollow portion 72 is formed in the other chuck member 34, and the operating rod 70 is slidably inserted through the hollow portion 72. Brackets 73, 73 are attached to the support plate 49, and link members 74, 74 are pivotally connected to the bracket 73, respectively. The other chuck member 34 is brought into close contact with the engagement groove 25 in synchronization with the one chuck member 33 in the engagement groove 25 of the extension portion 10. A bracket 75 is attached via adjustment means 80 for adjustment. And each operating rod 70,
70 and link members 74, 74, and link members 74,
74 and the bracket 75 are linked members 76, 76, 7
7 and 77 respectively. Further, as shown in FIGS. 7 and 8, proximity switches 78 and 79 are provided on the support plate 49 as sensors for confirming engagement or disengagement of the other chuck member 34 with the engagement groove 25, respectively. I have.

As shown in FIGS. 7 and 8, the adjusting means 80 includes a bolt 81 having a head portion 81a, and a compression spring 82 for urging the bracket 75 away from the other chuck member 34. 75 to bolt 8
1 is slidably inserted, and a bolt 81 is screwed into the other chuck member 34. The distance L (see FIG. 7) between the head 81a of the bolt 81 and the mounting surface of the other chuck member 34 is slightly larger than the thickness T (see FIG. 8) of the bracket 75 inserted into the bolt 81. It is formed so that it becomes. Further, the compression spring 82 is set to have a spring coefficient that can press the other chuck member 34 so as to be closely engaged with the engagement groove 25 of the extension portion 10 with an appropriate pressure. Thereby, the operating rod 7
0, the other chuck member 34 and the one chuck member 33 are not affected by the processing accuracy of the link members 74, 76, 77, and the bracket 75 and the wear of the pins for pivotally connecting these members. Not only can they be interlocked, they can be synchronously engaged with the engagement grooves 25 of the extension portion 10.

As shown in FIG. 3, the bracket 73 and the link members 74 and 76 of the interlocking means 40 are connected to the connecting means 9.
Is a place where the bracket 20 for supporting the side cylinder 4 is not provided on the fixed platen 1;
9 and, in the case where the bracket 20 is provided, in the bracket 20 forming the cover.

In the above-described embodiment, the chuck members 33 and 34 are provided in the engagement grooves 25 of the extension portion 10.
Although the description has been given of the configuration in which the chuck members 33 and 34 are moved in the horizontal direction, the present invention is not limited to this, and the chuck members 33 and 34 may be configured to be moved in the vertical direction as shown in FIG. . In this case, the own weights of the chuck members 33 and 34 are balanced with each other, and the chuck cylinder 35 can be made compact with small driving force.

Next, the operation of the thus-configured mold clamping device according to the present invention will be described. When performing molding by an injection molding machine using the mold clamping device according to the present invention, predetermined molds 5 and 5 are provided on opposing surfaces of the fixed platen 1 and the movable platen 2, respectively.
6, and pressurized oil is supplied to the cylinder chamber 4a so as to retract the piston rod 22 of the side cylinder 4, and the mold is closed. Since the side cylinder 4 has a smaller diameter than the main cylinder 7, the movable platen 2 is guided at a relatively high speed by the tie bar 3 inserted into the hollow portion 11 of the piston rod 8 of the main cylinder 7, and the movable platen 2 is fixed at a relatively high speed. It is moved close to 1.

The cam 26 (see FIG. 2) attached to the tip of the extension 10 of the piston rod 8
6 by contacting the movable platen 2 with the fixed platen 1, the side cylinder 4
The flow rate of the pressure oil supplied to the cylinder chamber 4a is reduced to reduce the mold closing speed.

The movable platen 2 is driven by driving the side cylinder 4.
At a low speed and further close to the fixed platen 1, and the main cylinder 7
2 attached to the extension 10 of the piston rod 8
When the end of the end 6 contacts the end plate 45a and the limit switch 47 is operated, the driving of the side cylinder 4 is stopped, and the engagement groove 25 is positioned so as to align with the chuck members 33 and 34. Then, from the state shown in FIG. 6, the chuck cylinder 35 of the coupling means 9 is extended and driven by the signal transmitted from the limit switch 47, and one of the chuck members 33 is engaged with the engagement groove 25 of the extension portion 10. Be close. As the one chuck member 33 approaches the engagement groove 25, the other chuck member 34
The operating rod 7 of the interlocking means 40, as shown in FIGS.
0, approaching the engaging groove 25 in conjunction with the chuck member 33 via the link members 74, 76, 77 and the bracket 75. At this time, as shown in FIG. 7, until the chuck member 34 engages with the engagement groove 25 of the extension portion 10, the bracket 75 is moved from the other chuck member 34 by the urging force of the compression spring 82 of the adjusting means 80. Separated. Then, as shown in FIG.
Is engaged with the engagement groove 25 of the compression spring 8 of the adjusting means 80.
The bracket 75 which has been separated from the other chuck member 34 against the urging force of No. 2 approaches the other chuck member 34 by a predetermined amount while being guided by the bolt 81. As a result, the other chuck member 34 synchronously engages with the engagement groove 25 of the extension portion 10 without any gap so as to receive the same surface pressure as that of the one chuck member 33 with an appropriate pressure. Is fixedly connected to the fixed platen 1.

When the piston rod 8 of the main cylinder 7 is fixedly connected to the fixed plate 1, pressure oil is supplied to the cylinder chamber 7a of the main cylinder 7 to press the movable plate against the fixed plate. With the dies attached between them being pressed, the nozzle of the injection device is inserted into the tapered hole 15 of the fixed platen 1 and the molding material is inserted into a cavity (not shown) formed by the dies. Injection filling. This pressing is maintained until the molding material injected and filled in the cavity is cooled and solidified or cured by heating to complete molding.

When molding is completed, pressurized oil is supplied to the cylinder chamber 7b of the main cylinder 7 to open the mold strongly,
The chuck cylinder 35 of the coupling means 9 is driven to retract, and the engagement groove 2 of the extension 10 of the one chuck member 33 is moved.
5 so as to be disengaged from each other. As the one chuck member 33 separates from the engagement groove 25, that is, is released, the other chuck member 34
The lever is moved away from the engaging groove 25 in conjunction with the chuck member 33 via the operating rod 70, the link members 74, 76, 77, and the bracket 75, and is released. Both chuck members 33, 34
When the proximity switch 58 confirms the disengagement of the extension 10 from the engagement groove 25 by the proximity switch 58, the movable platen is separated from the fixed platen by supplying pressure oil to the cylinder chamber 4b so as to extend the piston rod 22 of the side cylinder 4. And open the mold at high speed. When the mold opening is completed, the ejector mechanism 18 is driven to eject the ejector pins 19, and the molded product is taken out.

Next, a second embodiment will be described with reference to FIG. The same parts as those in the above-described embodiment,
Alternatively, the corresponding parts are denoted by the same reference numerals in FIG. 10 as in the above-described embodiment, and description thereof will be omitted. In the case of this embodiment, the hollow portion 90 is used as a pressing means for pressing the dies 5 and 6 attached to the fixed platen 1 and the movable platen 2.
High pressure clamping cylinder 92 having a ram 91 formed with
The high-pressure pressing cylinder 92 and the fixed platen 1 are arranged so as to face each other, and are connected to each other by a tie bar 3. 2 is slidably inserted, a side cylinder 4 is provided as a mold opening / closing means for quickly moving the movable platen 2 toward and away from the fixed platen 1, and a ram 91 of a high-pressure clamping cylinder 92 is provided as a transmission member. The movable ram 2 is provided with a mechanical ram 95 that can be inserted into the hollow portion 90, and the mechanical ram 9
5 is provided with coupling means 9 for coupling and fixing the 5 to the ram 91 of the high pressure clamping cylinder 92. In this embodiment, the movable platen 2 is driven by driving the side cylinder 4.
Is moved close to the fixed platen 1 and the mechanical ram 95 is moved.
When the mechanical ram 95 extends from the ram 91 of the high-pressure pressing cylinder 92,
The engagement members 33, 3 of the coupling means 9 are attached to the rear end face 95a so as to restrict the retraction of the second ram 91 into the hollow portion 90.
4 is engaged. Thus, the ram 91 of the high-pressure pressing cylinder 92 and the mechanical ram 95 are connected and fixed, and the high-pressure pressing force of the high-pressure pressing cylinder 92 causes the die attached to the opposing surface of the fixed platen 1 and the movable platen 2. Tighten 5,6.

The coupling means 9 in this embodiment is such that the mechanical ram 95 is a ram 91 of the high-pressure pressing cylinder 92.
When the mechanical ram 95 can restrict the retraction of the mechanical ram 95 into the hollow portion 90 of the ram 91 of the high-pressure pressing cylinder 92 when the mechanical ram 95 extends from It is possible to use a groove provided with a groove 25 and a projection 60 which can be engaged with the engagement groove 25 in each of the engagement members 33 and 34. A plate shape that can be simply brought into contact with 95a can also be used. In this case, the moving stroke of the engaging member can be made smaller than in the conventional technique of connecting and fixing or releasing the mechanical ram or the like and the high-pressure pressing ram or the like using a single blocking plate or the like. Therefore, the operation time can be reduced, and the output for movement can be reduced.

[0043]

According to the first aspect of the present invention, one of the plurality of engaging members is engaged and disengaged by the single moving means with respect to the transmitting member, and the other engaging members are moved. Since the engaging and disengaging movement can be performed in conjunction with the engaging and disengaging movement of one engaging member, the coupling means of the mold clamping device can have a simple configuration and can be reduced in size.
Since the engaging member can be engaged with and released from the transmitting member in a short time, the working time can be reduced.

According to the second aspect of the present invention, since each of the engagement members can be adjusted so as to be closely and synchronously engaged with the transmission member, the movable platen can be securely clamped. The transmission member can be connected and fixed so as to be able to perform.

According to the third aspect of the present invention, the moving means for engaging and disengaging one of the plurality of engaging members is provided by moving the one engaging member in a direction substantially perpendicular to the transmitting member. By arranging it so as to move, the moving means does not need a large output for engaging and disengaging the engaging member with respect to the transmitting member, so that the overall size of the mold clamping device can be reduced. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing a mold clamping device according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a mold clamping device according to the present invention.

FIG. 3 is a side view of the mold clamping device according to the present invention on the fixed platen side.

FIG. 4 is a partial sectional view showing a fixing means of the mold clamping device according to the present invention.

FIG. 5 is an explanatory view showing a state in which the engagement member is being moved from the state of FIG. 4;

FIG. 6 is an explanatory diagram showing a state in which the engagement member is at the retreat limit from the state of FIG. 5;

FIG. 7 is a partially enlarged cross-sectional view showing a state before the other chuck member engages with an engagement groove of an extension via an adjustment unit.

8 is a partially enlarged cross-sectional view showing a state in which the other chuck member has been engaged with the engagement groove of the extension via the adjustment means from the state of FIG. 7;

FIG. 9 is a partial sectional view showing a modified use example of the fixing means shown in FIG. 4;

FIG. 10 is a sectional view schematically showing a second embodiment of a mold clamping device according to the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Fixed board 2 Movable board 3 Tie bar 4 Side cylinder (mold opening / closing means) 5 Fixed mold 6 Movable mold 7 Main cylinder (pressing means) 8 Piston rod 9 Coupling means 10 Extension part (transmission member) 25 Engagement groove 33 , 34 chuck member (engaging member) 35 chuck cylinder (moving means) 40 interlocking means 80 adjusting means

Claims (3)

[Claims] 1. A mold opening / closing means for moving a movable plate so as to quickly move toward and away from a fixed plate, pressing means for clamping a mold attached to the fixed plate and the movable plate, and a movable plate. A transmitting member for transmitting the pressing force of the pressing means to the
A coupling means for coupling and fixing the transmission member so that the movable platen can be clamped via the transmission member. The coupling means engages the transmission member to engage the transmission member. A plurality of engaging members for coupling and fixing; a single moving unit for moving one of the plurality of engaging members to engage and disengage with the transmission member; A mold clamping device comprising: interlocking means for engaging and disengaging another engagement member with a transmission member in conjunction with an engagement member moved for release. The interlocking means includes an adjusting means for adjusting the other engaging member so as to be brought into close contact with the transmitting member in synchronization with one engaging member engaged and moved by the moving means. The mold clamping device according to claim 1, further comprising: 3. The moving means for engaging and disengaging one of the plurality of engaging members for moving the one engaging member in a substantially vertical direction with respect to the transmitting member. Item 3. A mold clamping device according to any one of Items 1 and 2.