JPH088813Y2 - Compound mold clamping device for injection molding machine - Google Patents

Description

[Detailed description of the device]

[0001]

INVENTION The present invention relates, about the composite clamping apparatus for an injection molding machine.

[0002]

2. Description of the Related Art As a compound mold clamping device for an injection molding machine, a small-diameter high-speed mold opening / closing cylinder and a large-diameter low-speed mold clamping cylinder are attached to a movable plate supported by a plurality of tie bars. The opening and closing movement of the movable platen is performed by the mold opening and closing cylinder, and the mold clamping movement of the movable platen is performed by a plurality of pairs of clamping members provided on the movable platen
(Commonly referred to as half nuts.) The movable platen in the mold clamping cylinder by combining movable platen in via clamping cylinder tie bars by fastening across the tie bar at the nip member thereof to move by an actuator With tie bar
It is known to move it in the beginning.

A fastening device for fastening the tie bar by sandwiching it with a sandwiching member in the above-described composite mold clamping device has a structure shown in FIG. That is, the pair of sandwiching members 11, 12
(The sandwiching member 12 is provided on the lower side of the tie bar 5 in FIG. 5, but is omitted because it is completely the same as the upper sandwiching member 11.) The outer peripheral surface of the tie bar 5 sandwiched by the tie bar 5 has a V-shaped cross section or the like. The spiral groove 5c is formed, and the pair of sandwiching members 1 is formed.
Protrusions 11c and 12 having the same shape as the spiral groove 5c, which are fitted into the spiral groove 5c and fasten the tie bar 5 to the reference numerals 1 and 12, respectively.
c is formed.

[0004]

[Problems to be Solved by the Invention] The above conventional injection molding machine
In the combined mold clamping device of No. 2, since the groove 5c of the tie bar 5 and the protrusions 11c and 12c of the sandwiching members 11 and 12 have a spiral screw structure, the spiral groove 5c and the protrusions 11c and 12c.
It is necessary to accurately match the phase of c, but this phase matching is difficult and time-consuming. Therefore, various phase aligners have been proposed (Japanese Patent Laid-Open No. 63-317243,
JP-A-2-265713). However, the structure becomes complicated accordingly.

The present invention does not require phase matching,
A structure that allows the bar to be always fastened accurately with sandwiching members.
Concrete simple, and an object thereof is to provide a composite mold clamping equipment of the injection molding machine.

[0006]

In order to achieve the above object, the present invention provides a movable platen supported by a plurality of tie bars with a small diameter and high speed mold opening / closing cylinder and a large diameter and low speed mold clamping cylinder. Attached, the movable platen is normally opened / closed by the mold opening / closing cylinder, and the movable platen is clamped on the movable platen.
The movable platen is connected to the mold clamping cylinder via the tie bar by moving multiple sets of clip members with the actuator and clamping each tie bar with the clip members, and the movable platen is moved together with the tie bar with the mold clamping cylinder. in composite clamping apparatus for an injection molding machine to carry out by the outer peripheral surface of each tie bar sandwiched by sandwiching seen member, the angular groove is formed in a plane perpendicular to the center line of the tie bar, or in pressed seen member, the upper
The width of the tie bar in the length direction is smaller than the groove width of the square groove.
Small fitted into the square groove of the tie bar to form a square-shaped projection for fastening the tie bars, to the tie bar, said tie bar and
Stop the movement of the movable plate in the closing direction with respect to the
The stop member for aligning the protrusion of the sandwiching member is provided at the position.

[0007]

[Operation] The square groove of the tie bar and the ridge of the sandwiching member have a spiral shape.
Since it does not have a screw structure, phase matching is unnecessary. In addition,
The lateral width of the ridges of the member is slightly smaller than the groove width of the square groove.
When the movable plate comes into contact with the stop member, the square groove of the tie bar
Since the ridges of the sandwiching member match the position of,
The iver can be fastened with a sandwiching member.

[0008]

1 to 4 show an embodiment of the present invention, in which reference numeral 1 is a fixed plate. The stationary platen 1 is provided with four mold clamping cylinders 2 and two mold opening / closing cylinders 3 and is fixed to a frame base 4. Each of the mold clamping cylinders 2 has the same shape and has a large diameter and low speed, and has a substantially rectangular shape.
It is arranged horizontally in the corner. The mold opening / closing cylinders 3 have the same shape, have a small diameter and a high speed, and are horizontally arranged at diagonal positions of the stationary platen 1. The cylinders 2 and 3 are parallel to each other. A tie bar 5 is integrally provided on the piston rod 2a of each mold clamping cylinder 2 with its center line aligned with the center line of the piston rod 2a. Each tie bar 5
Has a plurality of (five in the figure) square grooves 5a on the side of the piston rod 2a. Each of the square grooves 5a is independently formed on the outer peripheral surface of the tie bar 5 at a predetermined pitch in a plane orthogonal to the center line of the tie bar 5.

Reference numeral 6 is a movable plate. The movable plate 6 is also substantially rectangular and has sliding holes 6a at four corners facing the respective mold clamping cylinders 2. The movable plate 6 is placed on the rails 7 of the frame base 4 and slidably supported by inserting the tie bars 5 into the sliding holes 6a. Movable plate 6
A piston rod 3a of the mold opening / closing cylinder 3 is connected to the. A mold (not shown) is attached to the fixed plate 1 and the movable plate 6 as is well known.

Guide members 8 and 9 are horizontally provided at the sliding holes 6a on the surface of the movable plate 6 opposite to the fixed plate 1. Each pair of guide members 8 and 9 supports a pair of sandwiching members 11 and 12. Each sandwich member 11, 12
Is movable in the diameter direction of the tie bar 5 (left and right direction in FIG. 3). Each of the sandwiching members 11 and 12 has a semicircular inner peripheral surface with angular projections 11a and 12a of the same number as the angular grooves 5a of the tie bar 5. Each ridge 11a. The grooves 12a are formed at the same pitch as the square grooves 5a. Each ridge 11a. 12a tie bar
The lateral width Tw in the longitudinal direction of 5 is several than the groove width Mw of the square groove 5a.
mm smaller. Each of the sandwiching members 11, 12 includes a ridge 11a. 12
The tie bars 5 are fastened by inserting a into the square grooves 5a, respectively.

The inner sandwiching member 11 has a horizontal through hole 11b. The connecting rod 13 is inserted into the through hole 11b. In FIG. 3, the left end of the upper connecting rod 13 is fixed to the sandwiching member 11 inside the left tie bar 5 of the tie bars 5 and 5 adjacent to each other in FIG. 3, and the right end is the sandwiching member inside the right tie bar 5. It is inserted into the upper to form the through hole 11b of 11, and is fixed to the outside of the pinching member 12 of the right tie bars 5. Further, the left end of the lower connecting rod 13 is inserted into a through hole 11b formed below the sandwiching member 11 inside the left tie bar 5 to be fixed to the sandwiching member 12 outside the left tie bar 5, and the right end is It is fixed to the inside of the pinching member 11 of the right tie bars 5. In this way, the two pairs of the sandwiching members 11, 12, 11, 12 adjacent to each other on the left and right are connected to each other by the four connecting rods 13.

The sandwiching member 1 inside the tie bars 5 and 5
A fastening cylinder 14 having a piston rod 14a is provided between the Nos. 1 and 11. A stopper 15 is attached to the outer ends of the guide members 8 and 9. The stopper 15 prevents the outer sandwiching member 12 from separating outward from the guide members 8 and 9. The stopper 15 is a guide member 8,
It may be provided at the inner end of 9 to prevent the inner sandwiching member 11 from coming off.

Each tie bar 5 is provided with a stop member 16. The stop member 16 stops the movement of the movable plate 6 with respect to the tie bar 5 in the closing direction to the right in FIGS. 1 and 2, and the protrusions of the sandwiching members 11 and 12 are located at the positions of the square grooves 5 a of the tie bar 5 .
Match 11a and 12a . Further, the movable plate 6 has a detector 17 such as a limit switch for detecting the expansion / contraction operation of the fastening cylinder 14, that is, the open / closed state of the sandwiching members 11, 12.
18 is attached. An end plate 19 is fixed to the tip of the tie bar 5. The end plate 19 is slidably mounted on the rail 7. An ejector cylinder 20 is attached to the movable platen 6. The ejector cylinder 20 moves the ejector pin 21. Then, 22 also serves as a guide for the sandwiching members 11 and 12.
It was Oh Ru in the movable platen of the guide.

[0014] Then according to the present invention configured as described above
Describing the effect of the composite mold clamping equipment of the injection molding machine. Clamping is initiated by bringing the movable platen 6 in the mold closing cylinder 3 in a state in which the sandwiching member 11, 12 is opened at a high speed to the stationary platen 1 is moved in the closing direction. At this time, movable plate 6
Slides on the tie bar 5 and the rail 7 and approaches the fixed plate 1.
The movable plate 6 is brought into contact with the stop member 16 as shown in FIGS. 1 and 2
Protrusion of the sandwiching members 11, 12 at the position of the square groove 5a of the tie bar 5.
When Article 11a, 12a is that match each inner scissors member 11, 11 fastening cylinder 14 is extended outwardly, and the outer scissors members 12, 12, inwardly through each rod 13 Moving, the ridges 11a, 1 of the sandwiching members 11, 12
After the 2a is fitted into the square groove 5a of the tie bar 5 as shown in FIG. 4 and the tie bar 5 is fastened, the mold clamping cylinder 2 is contracted.

The movable plate 6 has a piston rod 2 of a mold clamping cylinder 2 when the tie bar 5 is fastened by the sandwiching members 11 and 12.
for coupling via a tie bar 5 in a, clamping by Ri the ridge 11a on the reduction of the cylinder 2, and 12a and square groove 5a
Moves together with the tie bar 5 after moving relatively in the gap
Then approach the stationary platen 1 further and clamp the mold with a strong force. The detector 17 detects the fastening of the tie bar 5 by the sandwiching members 11 and 12.

In the above, when fastening the tie <br/> bar 5 with scissors members 11, pinching protrusion 11 of the members 11 and 12
The lateral width Tw of a and 12a is the groove width M of the square groove 5a of the tie bar 5.
It is made slightly smaller than w, and the movable plate 6 has a stop member 1
6 is clamped in the position of the square groove 5a of the tie bar 5 while being in contact with
With the configuration in which the ridges 11a and 12a of the members 11 and 12 coincide with each other.
Because it is always accurately the ridges 11a, 12a are fitted to the tie bars 5 is fastened to <br/> square groove 5a. Also Thailand
The square groove 5a of the bar 5 and the ridges 11a of the sandwiching members 11 and 12,
Since 12a does not have a spiral screw structure,
It is unnecessary.

The mold opening is usually performed in the reverse order of the above. That is, the mold clamping cylinder 2 is extended, the movable platen 6 is moved by the stop member 16, the mold is separated, and then the fastening cylinder 14 is contracted to move the inner sandwiching members 11 and 11 inward.
Further, the outer sandwiching members 12, 12 are respectively moved outward to release the fastening of the tie bar 5 by the sandwiching members 11, 12, and the mold opening / closing cylinder 3 is extended to open and move the movable plate 6 at high speed. When the fastening cylinder 14 is extended to open the sandwiching members 11 and 12, the stopper 15 prevents the outer sandwiching member 12 from excessively moving. Therefore, one of the sandwiching members 11 and 12 is excessively opened and the other sandwiching member 11 is opened. , 12 do not remain with the tie bar 5 fastened. The detector 18 detects the opening of the sandwiching members 11 and 12.

In the above embodiment, the cylinder 14 is used as the actuator for moving the sandwiching members 11 and 12, but
The motor, screw, link, etc. can be replaced with this. Further, in the above-described embodiment, the inner sandwiching members 11, 11
The structure is such that the fastening cylinder 14 directly moves the
It is also possible to adopt a structure in which the outer sandwiching members 12, 12 are directly moved by an actuator such as a fastening cylinder 14.
Furthermore, in addition to the embodiment shown in the drawings, the compound mold clamping device has an insertion hole through which a tie bar is inserted in a piston and a piston rod of a mold clamping cylinder provided on a fixed platen or the like , and the insertion hole is inserted into the insertion hole. those that bind the movable platen in the mold clamping cylinder by being sandwiched member sandwich the insertion has been tie bars, or, such as those provided with mold opening and closing cylinder to the movable plate, there are various modifications, the present invention is such as its It can also be applied to a compound mold clamping device.

[0019]

As described above, the injection according to the present invention
Since the composite mold clamping device of the molding machine is configured as described above, it has the following effects. The square groove of the tie bar and the ridge of the sandwiching member are spiral screws.
Because it is not a structure, phase matching is not required, there is no need to facilities phasing device. The lateral width of the ridge of the sandwiching member is slightly smaller than the groove width of the square groove.
When the movable plate comes into contact with the stop member, the tie bar
Since the ridges of the sandwiching members are aligned with the positions of the square grooves, they are always accurate.
The tie bar can be fastened with a sandwiching member. As described above, the stop member is the square groove of the tie bar and the sandwiching part.
In addition to functioning to align the ridges of the material, it can also be used as a mold clamping cylinder.
Initial movement of the movable plate in the opening direction, that is, a large force is required.
It is rational because it also works for separating and moving required dies.
In this respect as well, the structure becomes simple.

[Brief description of drawings]

1 is a view to cross-sectional view of one embodiment of a composite type clamping apparatus for an injection molding machine according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a cross-sectional view showing a relationship between a sandwiching member, a connecting rod, a fastening cylinder, and the like.

FIG. 4 is a sectional view showing a fastening state of a tie bar by a sandwiching member.

FIG. 5 is a cross-sectional view showing a fastening state of a fastening device of a conventional compound mold clamping device .

[Explanation of symbols]

2 mold clamping cylinder 3 mold opening / closing cylinder 5 tie bar 5a square groove 6 movable plate 11, 12 sandwiching member 11a. 12a protrusion 13 connection rod 14 fastening cylinder (actuator) 16 stop member Mw groove width of square groove Tw lateral width of protrusion

Claims (1)

[Scope of utility model registration request] 1. A small-diameter high-speed mold opening / closing cylinder and a large-diameter low-speed mold clamping cylinder are attached to a movable plate supported by a plurality of tie bars, and the movable plate is normally opened and closed by the mold opening / closing cylinder. The mold clamping movement of the movable platen is provided on the movable platen.
The movable platen is connected to the mold clamping cylinder via the tie bar by moving multiple sets of clip members with the actuator and clamping each tie bar with the clip members, and the movable platen is moved together with the tie bar with the mold clamping cylinder. in composite clamping apparatus for an injection molding machine to carry out by the outer peripheral surface of each tie bar sandwiched by sandwiching seen member, it is formed square groove in a plane perpendicular to the center line of the tie bar, in or clamping seen member, The width of the tie bar in the length direction is the width of the square groove.
It is a little smaller than the tie bar, and it is fitted into the square groove of the tie bar to form a ridge for fastening the tie bar.
Stops the movement of the movable plate in the closing direction with respect to the tie bar.
Stop to align the ridges of the sandwiching member with the position of the square groove of the ever
Composite clamping equipment of the injection molding machine, wherein the member is provided et the.