JPS6118991Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extruder die changing device that allows extruder dies to be quickly and easily replaced.

Traditionally, preform dies used in extruders,
To replace dies, die holders, and other dies, for example, place a cart or cradle at the bottom of the extruder head, and then drop the dies to be replaced onto the cart or cradle without removing them from the head. or after the dice are removed while being held by a hanger, the dice are moved to another location and then protrude from the opening of the head from which the dice were removed. When it is necessary to remove residual rubber and other molding materials, then set new dies in the above-mentioned device, insert them into the head, attach and fix them, the replacement work is very complicated and takes a lot of time. was spent.

Therefore, while the marriage ratio of the extruder is significantly reduced, the molding material inside the extruder changes slightly during the long downtime during replacement work, and when the operation is restarted, the extruder cannot be obtained as expected. First, there are many problems, such as the possibility that the quality may not be stable, which significantly hinders the improvement of productivity, and the above-mentioned conventional replacement work is dangerous.

Therefore, recently, devices have been developed that automatically perform the above-mentioned replacement work sequentially, but all of these devices not only have extremely complicated and expensive structures, but also have limited versatility. At present, there are still problems such as the need for a lot of time.

The present invention was devised in view of the above-mentioned current situation, and it is an object of the present invention to provide an extremely effective and suitable extruder die changing device that solves the above-mentioned problems all at once.

In order to achieve the above object, the present invention has a die holding stand facing the discharge port provided in the head of the extruder at a height where the dice can be slidably transferred and mounted. A die transfer table that can reciprocate along the die holding table is provided on the die holding table, and a cutter that can be raised and lowered is provided at a desired position on the die transfer table. By providing positioning pins, if it becomes necessary to replace dies such as when changing the size of a molded product during extrusion, the necessary dies can be prepared in advance on the holding table during extrusion. Another advantage is that the die can be replaced in a very short time by simply moving the dice to a predetermined position using the transfer table.

Next, the present invention will be described by way of examples with reference to the drawings.

As shown in FIGS. 1 to 6, the present invention uses an extruder E.
A die holding stand ₁ that can slide the dice D at a height that allows the dice D to be attached to the discharge port E ₂ provided in the head E 1 of the die, and a cutter 2 at the required position.
and a die transfer table 4 which is movable up and down, has a die positioning pin 3, and is capable of reciprocating along the holding table 1, and the die holding table 1 is connected to the extruder E. It is provided so as to face the discharge port E ₂ provided in the head E ₁ , and the die transfer table 4 is attached to the die holding table 1 .

In this embodiment, the dies D refer to an extrusion mold that integrally combines a die holder D ₁ , a preform die D ₂ and a die D ₃ as shown in FIGS. 2 and 5.

The die holding stand 1 is constructed by arranging a pair of right and left holding rods 1a and 1b in parallel so that the dice D can slide on the upper surface thereof, and integrally assembling both ends of the holding rods 1a and 1b with cross bars 1c, respectively. The intermediate portion thereof is positioned below the head _E1 of the extruder E, as shown in FIG. 4, and is disposed at a height that allows the dies D to be mounted thereon.

Further, the dice transfer table 4 is shown in FIGS. 3 and 4.
As shown in the figure, it is positioned below the middle of each of the holding rods 1a and 1b of the die holding stand 1, and is slidably provided in the axial direction thereof. In this embodiment, as shown in the figure, the dice transfer table 4 is configured to be able to automatically reciprocate as required by means of a cylinder 5 attached to one side of the dice holding table 1. .

As shown in FIGS. 4 to 6, the cutter 2 includes a housing 2a attached to the transfer table 4, two inverted L-shaped cutters 2b disposed in the housing 2a so as to be able to rise and fall freely, and It is composed of two cylinders 2c that raise and lower each inverted L-shaped cutter 2b at required times. Note that the inverted L-shaped cutter 2b is the fourth
As shown in the figure, the cutting edges thereof are provided facing in opposite directions, and each cylinder 2c is attached to a cylinder holder 2d attached to the transfer table 4.

Next, the operation of the die exchange device described above will be explained.

When replacing the dies attached to the head E ₁ of the extruder E, first place the dies Da to be replaced on the right side of the die holder 1, as shown in Figs. 3 and 4. This is locked to the transfer table 4 by the positioning pin 3, and the head
The dies Db, which are press-fitted (attached) to E ₁ by a clamp device (not shown), are removed by operating the clamp device, and after placing it on the holding table 1, 5 to move the transfer table 4 to the left. Then, the dies Db and the dies Da on the holding table 1 are both moved to the left by the transfer table 4, and when the dies Da reaches the predetermined position of the head E ₁ , that is, the attachment position, the movement is stopped. Immediately, the clamping device operates to press the dies Da into a predetermined position, and extrusion can be resumed. Of course, while the transfer table 4 is moving, when the inverted L-shaped cutter 2b reaches the lower surface of the head _E1 , the cylinder 2c is automatically removed (by a cam, a micro switch, etc.).
The cutter 2b moves upward, its cutting edge presses against the lower surface of the head _E1 , cuts off the remaining rubber protruding from the discharge port _E2 as the transfer table 4 moves, and removes the new one to be replaced. The purpose is to clean the die mounting surface including the discharge port _E2 so that the dice Da can smoothly enter the mounting portion.

The dies that are exchanged and used are the above-mentioned Da,
In the case of two types of Db, leave the dies Db on the holding table 1 without removing it, and if you want to use Db again instead of Da, just operate the cylinder 5 in the opposite way to the above. , the dice can be easily replaced. (Of course, the operation of the clamp device and other operations are the same as described above.) When using other dies, remove the dies Db from the holding base 1 while using the dies Da. , just replace it with other necessary dice.

In this embodiment, when moving the transfer table 4 as described above, the cylinder 5 is used and operated automatically, but it is of course possible to operate it manually.

Since the present invention is configured as described above, when it becomes necessary to replace dies such as when changing the size of a molded product during extrusion, the necessary dies are placed on the holding table in advance during extrusion. By simply moving the dice to a predetermined position using the transfer table at the time of replacement, the replacement work can be carried out extremely easily and in a short time.

Therefore, not only the operating rate of the extruder can be significantly improved, but also molded products of stable quality can be obtained at all times, and the safety of replacement work can also be improved, which has a remarkable effect. In addition, a cutter that can be raised and lowered is installed at a desired position on the die transfer table, so when automatically exchanging dies, the cutter rises first and its cutting edge causes the remaining rubber to protrude from the discharge port provided in the head. etc. are cut as the die transfer table moves, allowing new dies to be replaced to enter the mounting area smoothly, and the mounting surface of the dies, including the discharge port, to be constantly cleaned. effective.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a plan view showing the device of the present invention attached to an opposed type rubber extruder, Fig. 2 is a side view with a part of the same removed, and Fig. 3 1 is an enlarged view of the main part shown in FIG. 1, FIG. 4 is a side view of the same, FIG. 5 is an enlarged front view of the same, and FIG. 6 is an enlarged front view of the cutter portion. 1...Dice holding stand, 2...Cutter, 3...
...Positioning pin, 4...Dice transfer table, E...
Extruder, E ₁ ... head, E ₂ ... discharge port, D ...
Dice.

Claims (1)

[Scope of utility model registration request] Facing the discharge port provided in the head of the extruder, install a die holding stand at a height where the dice can be slidably transferred and installed, and place the die on the die holding stand. A die transfer table that can reciprocate along the die holding table is provided, a cutter that can be raised and lowered is provided at a desired position of the die transfer table, and a positioning pin for the dice is provided. Extruder die exchange device.