JPH0521394Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a screw attachment structure for an injection molding machine for removably attaching a screw to an injection ram.

[Conventional technology]

In an in-line screw type injection molding machine, the screw may be temporarily removed from the injection ram of the injection device or replaced with another screw in order to change the color of the molding resin, change the injection compression ratio, maintenance inspection, etc. . Therefore, when attaching the rear end of the screw to the front end of the injection ram, a detachable attachment structure is adopted.

Typical conventional mounting structures are shown in FIGS. 5 and 6.

First, a spline part is formed in the rear end part 51 of the screw, and a ring groove 52 in the circumferential direction is formed in the middle part of the rear end part, and the front end part 54 of the injection ram is formed with a spline part in the rear end part 51 of the injection ram. A recess 56 with a large inner diameter is formed. On the other hand, the cylindrical portion 59 and the flange portion 6
Hole 5 consisting of 0 and having a spline part in the center
A fixing block 61 provided with a ring 8 is prepared, and spline-fitted into the rear end portion 51 of the hole 58 (spline portion) of this fixing block 61, and a stopper ring 57 consisting of two ring halves 57a and 57b is attached to the ring. Fits into the groove 52, and in this state, the cylindrical part 5
9 was inserted into the recess 56, and the flange portion 60 was fixed to the front end surface 54a of the front end portion 54 with a plurality of bolts 62a, 62b, 62c, . . . .

[Problems to be solved by the invention] However, such a conventional screw mounting structure has the following problems to be solved.

First, the flange portion 60 of the fixed block 61 has bolts 62a oriented in the same direction as the axial direction of the screw.
for attachment to the front end 54 of the injection ram using
From the viewpoint of strength and stability, a large number of bolts 62a...
are placed in symmetrical positions. Therefore, it is necessary to install and remove a large number of bolts, which requires a considerable amount of time and effort, resulting in poor work efficiency.
Moreover, accurate installation was difficult.

Second, in small injection molding machines, etc., the area around the connection between the screw and the injection ram is narrow, so the bolt 62a...
The conventional mounting structure in which the screw and screw axes are in the same direction makes it difficult to operate the tool. Therefore, the workability is poor, and there are also problems in terms of safety, such as the possibility that a worker may get his/her own finger caught during the work.

The object of the present invention is to provide a screw mounting structure for an injection molding machine that solves the problems existing in the conventional technology.

[Means to solve the problem]

Screw mounting structure 1 for injection molding machine according to the present invention
According to the above, when attaching the rear end portion 3 of the screw 2 to the front end portion 5 of the injection ram 4, a large diameter flange portion 41 provided on the rear end portion 3 and a large diameter flange portion 42 provided on the front end portion 5 are attached. and a rotation regulating portion 7 that regulates relative displacement of the rear end portion 3 and the front end portion 5 in the circumferential direction;
Rear end portion 3 including flange portion 41 and flange portion 4
2, to hold the rear end 3 and the front end 5 on the same axis, and to restrict relative displacement of the rear end 3 and the front end 5 in the axial direction. A connecting ring part 8, a fixing ring 12 that fits into the outer circumference of the connecting ring part 8 and fixes the connecting ring part 8 in a ring state, and a fixture 13 that fixes the fixing ring 12 to the connecting ring part 8. It is characterized by becoming. In this case, the fixing device 13 can be a single bolt attached to the fixing ring 12 in the radial direction.

[Effect]

Screw mounting structure 1 for injection molding machine according to the present invention
According to the method, a flange portion 41 provided on the rear end portion 3 of the screw 2 and a flange portion 42 provided on the front end portion 5 of the injection ram 4 are held on the same axis by a two-split connecting ring portion 8. In addition, relative displacement in the axial direction is regulated. On the other hand, the two-split connecting ring part 8 is fixed in a ring state by the fixing ring 12, and the fixing ring 12 and the connecting ring part 8
are connected by a fixing member 13, that is, a bolt, preferably a single bolt, attached in the radial direction of the fixing ring 12. Further, relative displacement of the rear end portion 3 and the front end portion 5 in the circumferential direction is restricted by a rotation restriction portion 7.

Therefore, the screw 2 and the injection ram 4 can be assembled or removed on the same axis by attaching and detaching the bolts attached in the radial direction of the fixing ring 12.

〔Example〕

Below, preferred embodiments of the present invention are listed,
This will be explained in detail based on the drawings.

First, in order to facilitate understanding of the present invention, a schematic configuration of an injection molding machine to which the present invention is applied, particularly an injection device, will be described with reference to FIG. 4.

The injection device designated by the reference numeral 20 includes an injection nozzle 22 at the front end and a heating cylinder 21 in which the screw 2 is loaded. The rear end of the heating cylinder 21 is connected to the front end of an injection cylinder 23, and the injection cylinder 23 houses an injection ram 4 that can be moved forward and backward. Further, the rear end 3 of the screw 2 is attached to the front end 5 of the injection ram 4 via the attachment structure 1 according to the present invention. A material supply hopper 24 communicating with the interior is provided at the rear of the heating cylinder 21, and a motor 25 for rotating the injection ram 4 in forward and reverse directions is provided at the rear end of the injection cylinder 23.

Next, the attachment structure 1 of the screw 2 to the injection ram 4 will be specifically described with reference to FIGS. 1 to 3.

First, a large diameter flange portion 41 is integrally formed on the rear side of the outer peripheral portion 3s of the rear end portion 3, and on the other hand,
A flange portion 42 having the same diameter as the flange portion 41 is also integrally formed on the front side of the outer peripheral portion 5s of the front end portion 5. Further, key grooves 43 and 44 are formed on the outer periphery of each flange portion 41 and 42. As a result, if the key 45 is inserted into both key grooves 43 and 44, the rear end 3
A rotation regulating portion 7 that regulates the relative displacement of the front end portion 5 in the circumferential direction can be configured.

On the other hand, a connecting ring portion 8 that can be split into two, that is, a connecting ring portion 8 consisting of a pair of ring halves 8a and 8b is prepared. Accommodating recesses 46a and 46b are provided in the inner peripheral portions of the ring halves 8a and 8b, respectively, in which the respective flanges 41 and 42 can be accommodated (fitted) in abutting state. Therefore, the accommodation recesses 46a and 46b hold the rear end portion 3 and the front end portion 5 on the same axis by holding the respective flanges 41 and 42. Also, a fixing ring 12 that can be fitted into the outer circumference of the connecting ring portion 8 to fix the connecting ring portion 8 in a ring state, and a bolt (fixing tool) 13 for fixing the fixing ring 12 to the connecting ring portion 8 This bolt consists of 1
3 is screwed into the fixing ring 12 in the radial direction.

Therefore, the screw 2 can be attached to the injection ram 4 by the following procedure.

First, the flanges 41 and 42 are brought into contact with each other, the key grooves 43 and 44 are aligned in the axial direction, and the key 45 is inserted into both the key grooves 43 and 44.

Next, the ring halves 8a and 8b are fitted so that the outer circumference 3s of the rear end 3 and the outer circumference 5s of the front end 5 are sandwiched between them. As a result, the connecting ring part 8 becomes a ring state, each flange part 41 and 42 is accommodated in the accommodation recess 46a, 46b, each flange part 41 and 42 is locked to the connecting ring part 8, and the rear end part 3 and the front end 5 in the axial direction. Further, a fixing ring 12 is fitted into the outer periphery of the connecting ring portion 8, and the fixing ring 12 is further fixed to the connecting ring portion 8 with a bolt 13 that can be tightened with a screwdriver, a cap wrench, or the like.

Therefore, according to such a mounting structure 1, it is sufficient to tighten the bolt in one place, and moreover, it is necessary to tighten the bolt at right angles to the axial direction of the screw 2 (in the radial direction of the fixing ring 12).
Therefore, the tightening work becomes extremely easy. Note that removal can be performed in reverse order.

Further, FIG. 3 shows a modified embodiment of the mounting structure 1. In the modified embodiment shown in the figure, when configuring the rotation regulating portion 7, a plurality of recesses 47 are provided on one side of the opposing surfaces of the flange portions 41 and 42, and a plurality of recesses 47 are provided on the other side to fit into the recesses 47. A convex portion 48... is provided. In this way, the rotation regulating section 7 can adopt any configuration capable of regulating relative displacement.

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments. For example, as the fixing part, the connecting ring part can be directly fixed with bolts or the like. Additionally, each ring half may be hinged at one end to facilitate installation. Other details such as composition, shape,
The quantity etc. may be changed arbitrarily without departing from the gist of the present invention.

[Effect of idea]

As described above, the screw attachment structure according to the present invention has a connecting ring part that can be split into two parts and a connecting ring part that can be fixed in a ring state when attaching the rear end part of the screw to the front end part of the injection ram. The fixed part holds them on the same axis and restricts relative displacement in the axial direction, and the rotation restriction part restricts relative displacement in the circumferential direction.
It has the following remarkable effects.

Since at least one bolt is sufficient for fixing the connecting ring portion in a ring state, the attachment work can be carried out in a short time, and work efficiency can be greatly improved.

In addition to requiring at least one bolt, the bolt installation direction is perpendicular to the axis of the screw, making the installation process easier. This can contribute to improved safety.

[Brief explanation of the drawing]

Figure 1: A partially vertical side view of the screw attachment structure according to the present invention, Figure 2: A sectional view taken along line B-B in Figure 1, Figure 3: A screw attachment structure showing a modified embodiment of the present invention. Partially sectional side view, Fig. 4: Vertical sectional side view of an injection molding machine to which the present invention can be applied, Fig. 5: Partial longitudinal sectional side view of the screw mounting structure according to the conventional technology, Fig. 6: In Fig. 5 C direction arrow view. In the drawings, 1...screw mounting structure, 2...screw, 3...rear end, 4...injection ram, 5...
Front end part, 7... Rotation regulating part, 8... Connection ring part, 12... Fixing ring, 13... Fixing tool (bolt), 41... Flange part, 42... Flange part.

Claims (1)

[Claims for Utility Model Registration] [1] In a screw mounting structure for an injection molding machine for attaching the rear end 3 of the screw 2 to the front end 5 of the injection ram 4, a large diameter flange provided on the rear end 3 41 , a large-diameter flange portion 42 provided on the front end portion 5 , a rotation regulating portion 7 that restricts relative displacement of the rear end portion 3 and the front end portion 5 in the circumferential direction, and a rear end portion including the flange portion 41 . 3 and flange part 4
2, to hold the rear end 3 and the front end 5 on the same axis, and to restrict relative displacement of the rear end 3 and the front end 5 in the axial direction. Connecting ring portion 8 and connecting ring portion 8
A fixing ring 12 that fits into the outer periphery of the connecting ring part 8 to fix the connecting ring part 8 in a ring state, and a fixture 13 that fixes the fixing ring 12 to the connecting ring part 8.
A screw mounting structure for an injection molding machine characterized by comprising: [2] The screw mounting structure for an injection molding machine according to claim 1, wherein the fixing tool 13 is formed by using a single bolt that is attached in the radial direction of the fixing ring 12.