JPH068302A - Mold clamping device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] A mold clamping device 1 that can easily open the mold 20 and the extruder 10 without manually releasing the bolt nut tightening work. Is intended to provide. [Structure] A clamp body (2) which can be freely contacted and separated from a head plate (11) toward an extruder (10) through an operating cylinder and a connecting central axis of the extruder (10) and a die (20) are arranged symmetrically and penetrate the head plate (11). And at least two engaging pins 3 whose one end is rotatably supported by the clamp body 2 and which extend toward the mold plate 21. A locking head having the same outer peripheral shape as the through hole of the engaging pin 3 having a cross-sectional shape with at least two axes of a long axis and a short axis formed in 21 is formed at the tip end on the die plate 21 side. In addition, at least the rotating head for mechanically rotating the locking head is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die clamping device used when attaching a molding die to an extruder.

[0002]

2. Description of the Related Art For example, when a synthetic resin pipe such as a vinyl chloride pipe is manufactured by extrusion molding, an extruder having a head plate at its tip and a plate (gold plate) connected to the head plate are used. A molding die having a mold plate) is used. Then, while the extruder head plate and the mold plate are fastened, the plasticized resin is sent forward by rotating the screw in the cylinder of the extruder, and is further extruded continuously through the mold to form a pipe shape. It is designed to be formed.

In this case, if the head plate of the extruder and the mold plate are not securely fastened to each other in a predetermined state, the resin may flow out between the plates due to the pressure (resin pressure) acting on the resin during extrusion. become. Therefore, in order to prevent such outflow of resin, conventionally, for example, an extruder head plate and a mold plate are connected by a plurality of bolts and nuts, and those nuts and the like are used with a spanner or the like. I was manually tightening it.

[0004]

However, since it is difficult to evenly tighten the bolts and nuts in the above-described manual tightening, the tightening force tends to differ depending on the tightened portion. Therefore, there is a problem that resin flows out between the extruder head plate and the mold plate in the portion where the tightening force is relatively weak.

In order to solve this problem, the inventors of the present invention have proposed a mold clamping device 1 as shown in FIGS.
01 is proposed first. That is, the mold clamping device 101 is provided with the clamp bodies 102, 102 on the extruder 110 side of the head plate 111, and is provided on the clamp body 102 by feeding and withdrawing a pressurized medium into the cylinder chamber 102a. The two actuating cylinders 105 are projected and retracted so that the clamp body 102 can be brought into and out of contact with the head plate 111.

Therefore, this mold clamping device 101
After fastening the head plate 111 and the mold plate 121 with the bolts 103 and the nuts 104 as in the conventional case, the pressurizing medium is fed into the cylinder chamber 102a until a predetermined pressure is reached, so that the working cylinder 105 causes the head plate 111 to move. It is possible to pull out the mold plate 121 toward the head plate 111 by projecting to the side and evenly clamp the head plate 111 and the mold plate 121 at a predetermined pressure, which is an excellent solution to the above-mentioned conventional problems. It is a thing.

However, the mold clamping device 101 still has the following problems. That is, when the molding is completed and the extruder 110 and the mold 120 are opened, finally, the screw 103 and the nut 104 cannot be opened unless the screw is unthreaded. There are many. Moreover, if the extruder 110 and the mold 120 are to be opened immediately after the completion of molding, the temperatures of the bolt 103 and the nut 104 have reached 100 ° C. or higher.
It cannot be removed by hand without using heat-resistant gloves,
Workability is also very poor.

In view of the above circumstances, the present invention provides a mold clamping device capable of easily opening the mold and the extruder without manually tightening and releasing the bolts and nuts. Is intended to provide.

[0009]

SUMMARY OF THE INVENTION In order to achieve such an object, a mold clamping device according to the present invention includes a clamp main body which is detachable from a head plate in a direction of an extruder through an operating cylinder, and an extruder. The machine and the mold are arranged symmetrically with each other, extend through the head plate in the mold plate direction, and have at least two engagement pins whose one end is supported by the clamp body. The engaging pin has an outer peripheral shape locking head that is substantially the same as or slightly smaller than the through hole of the engaging pin that has a cross-sectional shape that is provided in the mold plate and that has at least two axes of a long axis and a short axis. Part is formed at the tip of the mold plate side,
At least rotating means for mechanically rotating the locking head is provided.

In the above structure, the cross-sectional shape of the through hole is not particularly limited as long as it has a long axis and a short axis, but examples thereof include polygonal shapes such as rectangles and triangles, and elliptical shapes. . It is preferable that a plurality of actuating cylinders are arranged symmetrically about the connecting central axis. Oil is preferable as the pressurizing medium sent to the cylinder chamber of the working cylinder, but water may be used.

[0011]

According to the above construction, when the die and the extruder are connected to each other, the die plate and the head plate are opposed to each other, and the operating cylinder is operated to bring the clamp body close to the head plate. deep. Then, the mold plate and the head plate are brought close to each other, and the engaging pin is inserted into the through hole so that the locking head projects from the mold plate (of course, at this time, the shaft of the locking head ( Long axis and short axis)
And the axis of the through hole (long axis and short axis) are aligned. ). Next, the rotating means is operated so that the axis of the locking head is displaced from the axis of the through hole, and then the operating cylinder is operated to move the clamp body away from the head plate. Since the long axis side edge of the locking head is caught on the mold plate surface around the through hole, the mold plate is attracted to the head plate side and the mold and the extruder are connected with a predetermined pressing force. Will be.

On the other hand, when the connection is released, the actuating cylinder is operated to bring the clamp main body close to the head plate, and the rotating means is operated so that the shaft of the locking head is the shaft of the through hole. After turning the locking head so that
The mold can be disconnected from the extruder by moving the mold away from the extruder.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 shows an embodiment in which the mold clamping device of the present invention is applied to a connecting portion between an extruder and a mold for manufacturing a PVC pipe. As shown in the figure, the mold clamping device 1 according to this embodiment is mounted across a head plate 11 provided at the tip of the extruder 10 and a mold plate 21 provided at one end of a mold 20. Has been.

Here, the extruder 10 in the illustrated example includes a hopper 12 to which a molding material is supplied, and a cylinder 13 which heat-plasticizes the material sent from the hopper 12 and pushes it forward with a predetermined pressure. The resin extruded from the cylinder 13 is supplied to the mold 20 through the head plate 11 and the mold plate 21, and the mold 20
The vinyl chloride pipe 30 is continuously formed by being formed into a pipe shape and extruded forward. A connecting ring 14 is provided between the head plate 11 and the mold plate 21, and passes through the connecting ring 14 from the extruder 10 side to the mold 20.
The resin is sent to the side.

The mold clamp device 1 is located on the extruder 10 side of the head plate 11 and is symmetrical with respect to the cylinder center (connection central axis) of the extruder 10 as shown in FIGS. It is provided with a pair of left and right clamp bodies 2 and 2 arranged at positions and engagement pins (clamp bolts) 3 and 3 whose one ends are rotatably supported by the clamp bodies 2 and 2.

The engaging pin 3 penetrates the clamp body 2 and the head plate 11, and nuts 4 and 4 are screwed into one end of the clamp body 2 side, respectively. Stop heads 31 are provided respectively. The nut 4 is tightened in consideration of the stroke of the working cylinder described later, and the engagement pin 3
Of the head plate 11 is prevented from coming off.

The rotating means 7 comprises a lever 71 and this lever 7
The cylinder device (rotating cylinder) 72 for activating 1 is configured. The cylinder device 72 is fixed to the head plate 11, and one end of the lever 71 is loosely fitted along the shaft 73a to the shaft 73a of the connecting bar 73 provided at the tip of the cylinder body 72a.

The other end of the lever 71 is the head plate 11
It is fixed to an intermediate portion of the engagement pin 3 between the engagement pin 31 and the engagement pin 31 via a set bolt (not shown). That is, as shown in FIG. 5, the rotating means 7 has a cylinder body 72.
The lever 71 is moved up and down by protruding and retracting a in the direction of arrow X, and the engagement pin 3 is rotated forward and backward in the direction of arrow Y.

On the other hand, the left and right clamp bodies 2 and 2 are formed with a pair of upper and lower cylinder chambers 2b so as not to interfere with the engagement pins 3, and the working cylinders 5 are provided in these cylinder chambers 2b. They are The working cylinder 5 is arranged so as to be symmetrical with respect to the center of the cylinder of the extruder 10 in the relationship between the left clamp body 2 and the right clamp body 2. And
Oil as a pressurizing medium in the cylinder chamber 2b is extracted to pressurize and depressurize the inside of the cylinder chamber 2b so that the clamp main bodies 2 and 2 can come in and out of contact with the head plate 11. There is.

Further, a rectangular through hole 21a which is substantially the same as or slightly larger than the engaging pin 31 is formed in a portion of the die plate 21 corresponding to the engaging pin 3. Next, the operation of this embodiment will be described. When the mold 20 and the extruder 10 are connected to each other, first, the mold 20 and the extruder 10 are arranged so that the mold plate 21 and the head plate face each other, and the cylinder chamber 2b is depressurized. The working cylinder 5 is retracted so that the clamp body 2 is moved to the head plate 11
Keep it close to your side.

Then, the mold 20 is brought closer to the extruder 10 side, and as shown in FIG. 6A, the engaging pin 3 is passed through so that the locking head 31 of the engaging pin 3 projects from the mold plate 21. Two
Insert into 1a. Next, the cylinder main body 72a of the rotating means 7 is extended downward and the lever 71 is lowered to the lower side as shown in FIG. The axis (long axis and short axis) and the axis of the through hole 21 (long axis and short axis) are made orthogonal to each other, and then the pressurized medium is fed to pressurize the cylinder chamber 2b to a predetermined pressure. When the pressurized medium flows into the cylinder chamber 2b, the working cylinder 5
Of the locking head 31, the locking head 31 is attracted to the head plate 11 side, and as shown by the solid line in FIG.
1a is pressed against the mold plate surface 21b at the periphery of the through hole, and the mold plate 21 is further drawn to the head plate 11 side as shown by the chain line in FIG. Therefore, the connecting ring 14 is firmly sandwiched between the mold plate and the head plate 11. That is, the mold plate 2
1 and the head plate 11 are fixed by the action of the working cylinder 5 in a state in which they are uniformly tightened from four directions.
Further, at this time, one end of the lever 71 is loosely fitted to the shaft 73a of the connecting bar 73, and the lever 71 slides along with the engagement pin 3 toward the head plate 11 along the shaft 73a.
No load is applied to the cylinder device 72.

On the other hand, when the connection is released, the pressure applied to the working cylinder 5 is released. That is, depending on whether or not the pressurization is released, the clamp main body 2 approaches the head plate 11, and the engagement pin 3 easily rotates. Then, the lever 71 is pulled up by pulling up the cylinder main body 72a of the rotating means 7, and the state shown in FIG. 6 (a), that is, the axis of the locking head 31 is aligned with the axis of the through hole 21a. After that, by moving the mold 20 away from the extruder 10 and pulling out the engagement pin 3 from the through hole 21a, it is not necessary to manually loosen the bolts and nuts as in the conventional case. However, the connection between the mold 20 and the extruder 10 can be released.

According to the mold clamping device 1 in the above-mentioned implementation, the mold plate 21 and the head plate 1 are mechanically rotated by the rotating means 7 so that the mold plate 21 and the head plate 1 are
The uncoupling of 1 is done mechanically. Therefore, the connection between the die 20 and the extruder 10 can be easily released even in the state where the connection portion of the molding boring machine still maintains a considerably high temperature.

Further, since the engaging pin 3 is structured so as to prevent the engaging pin 3 from coming off via the nut 4, if the screwing degree of the nut 4 is adjusted, it can be attached even if the thickness of the die plate 21 is changed. It is possible. The mold clamping device according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the rotating means 7 rotates the engaging pin 3 by moving the lever 71 up and down by the cylinder device 72, but one end of the engaging pin 3 is fixed to the clamp body 2.
Is rotatably supported by a bearing and the like, and a driving means such as a motor which directly rotates in the reverse direction is directly connected to one end of the engagement pin 3, and the engagement pin 3 is rotated by rotating the driving means in the forward and reverse directions. You may allow it.

[0025]

Since the mold clamping device according to the present invention is constructed as described above, the mold and the extruder can be operated without the work of tightening and loosening the bolt and the nut key. Can be mechanically simply connected or disconnected. Moreover, even if the connecting part immediately after molding is kept in a fairly high temperature state, the mold and the extruder can be separated from each other without using special tools such as heat resistant gloves. Time can be shortened. In addition, it is safe because the worker does not work by hand.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a perspective view showing a state in which a mold clamp device is attached to a connecting portion between an extruder and a mold for manufacturing a PVC pipe.

FIG. 2 is a cross-sectional view of a peripheral portion of the mold clamping device in FIG. 1 viewed from an arrow C direction.

FIG. 3 is a front view showing the mounting state of the rotating means on the head plate as viewed from the mold plate side.

FIG. 4 is a front view showing the mounting state of the rotating means on the head plate as seen from the extruder side.

FIG. 5 is an explanatory diagram illustrating operations of a rotating unit and an engagement pin.

FIG. 6 is a diagram for explaining the operation of the mold clamping device, and FIG. 6 (a) is a perspective view showing a state immediately after being inserted into the through hole of the engaging head of the engaging pin or before being withdrawn. (B) of the same figure is a perspective view showing a state in which the engaging pin is rotated so that the locking head is hooked on the mold plate.

FIG. 7 is an explanatory diagram illustrating the operation of the working cylinder.

FIG. 8 is a plan view showing a peripheral portion of a mold plate and a head plate to which a mold clamp device of a prior example is attached.

FIG. 9 is a view on arrow A in FIG.

10 is a partially cutaway cross-sectional view in the direction of arrow B in FIG.

[Explanation of symbols]

 1 Mold Clamp Device 2 Clamp Main Body 3 Engagement Pin 5 Working Cylinder 7 Rotating Means 10 Extruder 11 Head Plate 20 Mold 21 Mold Plate

Claims (1)

[Claims] 1. An extruder and a mold are connected to each other by fixing a head plate provided at the tip of the extruder and a mold plate provided at one end of the mold in a predetermined state. In the mold clamping device, the clamp body that can be separated from and contacted with the head plate in the direction of the extruder through the working cylinder and the connecting central axis of the extruder and the mold are arranged symmetrically and penetrate the head plate. And at least two engaging pins whose one end is supported by the clamp body, the engaging pins being bored in the mold plate and having a long axis and a short axis. A locking head having an outer peripheral shape that is substantially the same as or slightly smaller than the through hole of the engaging pin having a cross-sectional shape including at least two shafts is formed at the tip end on the mold plate side, and at least the engaging member. Stop head Mold clamping apparatus characterized by turning means for mechanically rotated is provided.