JPH08207106A - Split type heating cylinder of injection molding machine and heating cylinder hanging device - Google Patents

Abstract

PURPOSE: To facilitate the inspection of a back flow preventing valve or the replacement of parts and to discharge or clean a resin cured by mistake by dividing a heating cylinder plasticizing a raw material resin by the cooperation with a screw to perform injection into two parts in the vicinity of the leading end thereof and forming the divided heating cylinder on the side of the leading end part into a movable or detachable structure. CONSTITUTION: A heating cylinder 11b having a screw 13 built therein on the side of a leading end part has a heating cylinder head 15 at the left end part thereof and a nozzle 16 is threaded with the heating cylinder head 15 to form a resin injection part. The right end part of the heating cylinder 11b is matched with a heating cylinder 11a being a main body by a socket joint 22. Since a heating cylinder is small in an injection molding machine of which the mold clamping force is about 32 or 50 ton, the heating cylinder 11b can be manually detached. When a bolt 20 is detached after a screw 24 is allowed to retreat to the interior of the heating cylinder 11a, the heating cylinder 11b can be detached. If the heating cylinder 11b is fixed to be not detached, the heating cylinder 11b can be separated using the detached bolt 20 and a tap 21 for a jack.

Description

Detailed Description of the Invention

[0001]

[Industrial application] A heating cylinder for an injection molding machine is divided into two near the tip, and the heating cylinder on the tip side can be moved or removed to expose a part of the internal screw. Regarding

[0002]

2. Description of the Related Art Usually, a single heating cylinder is used in an injection molding machine. When the molding machine using this heating cylinder is for a thermoplastic resin, it is essential to install a check valve at the tip of the internal screw. However, since the ring valve that constitutes this valve rotates the screw under the condition that an excessive resin pressure is applied, it is always necessary to inspect the ring valve to check the state of wear. Further, in the case of a thermosetting resin molding machine in which a smear head is attached to the screw tip for the purpose of preventing backflow, the resin hardened inside the heating cylinder cannot be discharged as it is because the smear head interferes.

In such a case, in a molding machine for thermoplastic resin, the screw is pulled out from the heating cylinder to inspect and replace the ring valve, and in the case of a molding machine for thermosetting resin, the screw is also removed from the heating cylinder. It is necessary to pull out and take out the cured resin and clean it.

[0004]

In these operations, a high-temperature heating cylinder or screw, which is generally heavy, is directly handled by hand.
Moreover, a machine with a large horsepower is the opponent, and there are many dangers. If the screw needs to be pulled out many times a day for the above reason, the loss of time for that purpose is large. In such a case, maintenance and inspection will be much easier if the problematic screw tip can be easily exposed.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] In an injection molding machine using a thermoplastic resin or a thermosetting resin, a raw material resin is plasticized in cooperation with a screw, and a heating cylinder for injection is divided into two parts near the tip. Then, the heating cylinder on the tip end side is configured to be movable or removable.

[0006]

As described above, the screw for thermoplastic resin has the check valve attached to the tip thereof, and it is necessary to frequently check and replace the parts. Further, some thermosetting resin screws have a backflow preventing smear head attached to the tip thereof, and the cured resin cannot be discharged. By using a heating cylinder divided into two parts and removing the tip part as necessary, the tip part of the screw can be exposed, which facilitates maintenance and inspection and discharge of resin.

[0007]

EXAMPLE FIG. 5 shows a smear head 1 in a split heating cylinder 11.
This is a heating device for a thermosetting resin, which has a screw 13 attached thereto. The heating cylinder 11b at the tip has a heating cylinder head 15 at the left end, and a nozzle 16 is screwed into the heating cylinder head 15 to form a resin injection portion. The right end portion of the heating cylinder 11b is a main body of the heating cylinder 11a by the spigot alignment 22.
To match. The screws 23, 23 are turned to the outer diameter of the matching portion of the heating cylinders 11a, 11b, the flanges 19a, 19b are screwed together, and the both are fastened with a bolt 20. Further, jack tap holes 21 are provided at three positions on the flange 19a that do not interfere with the bolt 20. Then, passages 18, 18 for the temperature control medium are provided on the outer circumference of the heating cylinder, and the outer circumference thereof is covered with the covers 17, 17.

Since the groove 14 formed between the flights 24 with a compression ratio of 1 to 1.1 in the screw 13 has substantially the same shape over the entire length, the solidified resin can move in the groove 14. However, since the smear head 12 is attached to the tip, the solidified resin cannot pass through the gap T between the smear head 12 and the heating cylinder 11b as it is.

In a compact molding machine with a mold clamping force of about 32 tons or 50 tons, the heating cylinder is also small, so that the heating cylinder 11b can be removed by hand as shown in FIG. The resin 25 that has hardened in the groove 14 is pushed out in a spiral shape by reciprocating and rotating the screw 13. Heating cylinder 1
To remove 1b, the screw 24 may be retracted into the heating cylinder 11a, and then the bolt 20 may be removed. If heating 11
When b is stuck and cannot be removed, it can be separated by using the removed bolt 20 and the jack tap hole 21.

FIG. 1 shows a heating device for a thermoplastic resin having a mold clamping force of about 100 to 150 tons, and the same object numbers are used for the same purpose as in FIGS. 5 and 6 described above. . In this figure, an example in which the screw 27 with the check valve 33 is built in is shown. As the machine becomes larger, the weight of the heating cylinder 70b at the tip also becomes heavier, and the heating cylinder 7 of high temperature removed
Since it is dangerous to hold 0b manually, the flange 26a,
26b has a square shape in the lower half, and the heating cylinder 7 on the main body side
Mounting members 31, 31 having elongated holes 37 are fixed to the lower ends of the flange 26a screwed to the 0a, and the flange 26b screwed to the heating cylinder 70b and the mounting members 31, 31 are inserted through the elongated holes 37. The shoulder bolts 32, 32 are held so that they can be slightly rotated and moved.

The check valve 33 comprises a screw head 28, a ring valve 29 and a wear plate 30. The ring valve 29 is inserted through the neck portion of the screw head 28, and a spigot 39 provided concentrically with the screw 38 serves as a wear plate. The screw 38 is screwed into the screw 27 while aligning the screw 30. A nozzle extension 35 and a nozzle 36 are screwed into the heating cylinder 70b. Heaters 34, 34 are wound around the outer circumference of the heating cylinder.

To remove the heating cylinder 70b, the screw 27 is retracted and pulled into the heating cylinder 70a. After that, the bolt 20 is removed, and the heating taps 70a and 70b are separated from each other by using the jack tap hole 21 and the removed bolt 20.
This also serves to cancel the alignment of the spigot alignment 22, and the slot 37
You can move in parallel by the distance allowed by. Then, the screw 27 is slowly tilted downward to project the screw 27 to the most advanced position, whereby the state shown in the drawing can be obtained, and the check valve 33 and the parts can be replaced.

FIG. 2 is a view in the direction of arrow 2 in FIG. Two
Reference numerals 1, 21 and 21 are jack tap holes provided on the tap hole circle. The flange 26b is held by a shoulder bolt 32 so as to be slightly rotatable and movable.

In an injection molding machine having a mold clamping force of over 200 tons, the heating cylinder removed is heavy and cannot be carried by human power, and a heating cylinder suspension device is required. 3 is a cross-sectional view of the heating tube suspension device, and FIG. 4 is a view seen from the direction of arrow 4 in FIG.
Reference numeral 40 in the figure is a heating device for the thermoplastic resin.

The structure of the heating tube suspension device is as follows. A fixed platen 42 to which a fixed mold (not shown) is attached has four corners.
A tie bar 41 of a book is framed together with a mold clamping cylinder and a movable platen (not shown). Reference numeral 43 is a locating ring for positioning the fixed mold. Generally tie bar 41
A tap hole 60 for processing such as heat treatment is formed on the end surface of the tie bar 4 for fixing the upper two corners of the fixing plate 42.
Using the tap holes 60 of Nos. 1 and 41, a mounting plate 44 extending between both tie bars is mounted with bolts 45. However, if the fixing plate 42 has a mounting portion, this may be used.

The structure of the lateral movement mechanism 71 is as follows.
A slit 63 is formed in the mounting plate 44, and two rollers 49 with one flange are fitted in the slit 63, and are held by a disk-shaped flange 47 and bolts 48 so as not to come off. An L-shaped arm 46 is fixed to the roller 49 with a nut 50. Further, two rollers 51 are provided on the lower surface of the arm 46 so that the outer periphery thereof abuts the mounting plate 44, and is provided to support the moment exerted by the load applied to the suspension bolt 52 at the tip of the arm 46. The slit 63 functions as a rail for moving the heating tube suspension device, and is processed on the side opposite to the operation side.

The arm 46 can move in parallel within the range permitted by the slit 63. The slits 63 are for retreating as needed when the heating cylinder hanging device is not used or for moving the hanging heating cylinder 70b to a position where it can be easily operated when cleaning. Therefore, the slit 63 may be extended to the operation side if necessary. A bolt 52 is attached to the end of the L-shape of the arm 46 so as to prevent the nut 53 from coming off, and at the lower end thereof, an L-shaped metal fitting as a suspending tool 55 is formed in an elongated hole 61.
The bolt 52 is inserted through and goes down. The hanging tap hole 64 provided in the heating cylinder 11c of the heating device 40 and the hanging tap hole 65 provided in the flange 26c are provided for hanging the heating cylinder 11c, and the attachment hole of the hanging tool 55 is also the tap hole. It can be fixed with bolts 56 and 57.

When suspending the heating cylinder 11c, the suspending tool 55 can be displaced within the range allowed by the elongated hole 61, and is used for balancing and for aligning the positions when the bolts 56 and 57 are screwed together. it can. However, if only one type of heating cylinder is used, the position to be balanced can be determined in advance, so that it is not necessary to form a long hole.

[0019]

EFFECT OF THE INVENTION Since the heating cylinder for the thermoplastic resin using the check valve at the screw tip and the heating cylinder for the thermosetting resin with the smear head attached to the screw tip are of the two-part type, the heating cylinder on the tip side is provided. Can be removed to expose the tip of the screw. If you use a heating cylinder for thermoplastic resin, you can easily check the exposed check valve and replace parts.
If it is a heating device for thermosetting resin, the smear head is exposed and cured resin that cannot be discharged as it is can be discharged, and the dangerous work of pulling out the screw from the heating cylinder every time troubles occur until now are greatly reduced. .

In FIG. 1, since the mounting members 31 and 31 are attached to the lower side of the flange 26a in the heavy heating cylinder, the removed heating cylinder 11c is held by the mounting member 31 and the moving distance is short. The treatment of the heater wire wound on the cylinder becomes easy, and the risk of handling heavy objects is low.

The heating tube suspension device shown in FIGS. 3 and 4 is a device for handling a heating tube having a weight that cannot be handled by humans at high temperature. Heating cylinder 11
It is possible to clean the inside of the heating cylinder as it is because it can be moved without removing c and can be freely rotated. Further, particularly regarding the installation, if the tap hole 60 of the tie bar 41 is used, it is not necessary to secure a mounting place on the fixed plate 42, and the nut 59 for the tie bar is not obstructive. That is, the upper surface of the fixed platen 42 is often occupied by the unloader and cannot be used, and it is good if the upper surface of the fixed platen 42 can be attached to the opposite surface 66 of the fixed die attachment.
This is because ribs and the like are arranged when casting itself and are not necessarily flat.

[Brief description of drawings]

FIG. 1 is a mechanism for holding the tip of a heavy heating cylinder on the main body heating cylinder.

FIG. 2 is a front view of the mechanism of FIG.

FIG. 3 is a diagram of a heating tube suspension device.

4 is a front view of the device of FIG.

FIG. 5 is a view of a heating cylinder of a small injection molding machine divided into two parts.

FIG. 6 is a diagram showing that the resin cured by the thermosetting resin molding machine is discharged.

[Explanation of symbols]

 11a, 11b heating cylinder 12 smear head 13 screw 14 groove 19a, 19b flange 26a, 26b flange 31 mounting member 33 check valve 46 arm 49 roller 55 L-shaped metal fitting 63 slit 70a, 70b heating cylinder

Claims (4)

[Claims] 1. In an injection molding machine using a thermoplastic resin or a thermosetting resin, a raw material resin is plasticized in cooperation with a screw, and a heating cylinder for injection is divided into two near the tip, and the tip is formed. A split type heating cylinder of an injection molding machine, characterized in that the heating cylinder on the side is movable or removable. 2. The heating cylinder (7) divided into two according to claim 1.
0a, 70c) are connected by spigot alignment (22), and flanges (26a, 26b) which are screwed to screws (23, 23) turned on the outer diameter portion of the connection end surface.
Has a square bottom shape, and the heating cylinder (11
A mounting member (31, 31) with an elongated hole (37) is fixed to both lower sides of the flange (26a) of FIG.
1c) the lower side of the flange (26b) on both sides of the elongated hole (3
A split type heating cylinder for an injection molding machine, characterized in that it is held by shoulder bolts (32, 32) via 7) so that it can be slightly rotated and moved. 3. A bolt (52) hung at the tip of an L-shaped arm (46) of a lateral movement mechanism (71) and a hanger (55).
A heating tube suspension device, characterized in that the heating tube is suspended by means of a device. 4. The heating cylinder suspension device according to claim 3, wherein the stationary platen (42) is attached by using tap holes (60) on the end faces of the two tie bars (41) at the upper corners.