JPS5853133Y2 - Plunger mounting device - Google Patents

Description

[Detailed Description of the Invention] An object of the present invention is to enable the plunger to be replaced easily and within a short time without damaging the connecting portion between the plunger and the plunger support member.

Generally, the plunger used in extruders is attached to the tip of a support member such as a plunger rod, but each time the plunger wears out, the extruder operation is stopped and the worn plunger is replaced with a new one. was.

Particularly in the case of die-casting machines, the actual situation is that the plunger is frequently replaced due to significant wear.

By the way, conventionally, Figure 1! (As shown, the plunger 1 is screwed onto the tip of the plunger rod 15 via a joint 14, and replacement of the plunger depends on the high temperature of the worn plunger. It takes two people to hang out.

If the connection between the plunger and the joint is difficult, trying to force the plunger to turn by hitting the wrench with a hammer, etc. may cause twisting damage to the plunger rod or damage the connection between the plunger and the rod. Not only does this have the disadvantage of damaging the threaded part, but it also requires a great deal of effort and time.

In order to eliminate these conventional drawbacks, we have conducted extensive research and have completed the present invention.

That is, in the present invention, when a joint is attached to a connecting hole provided at the end of a plunger, a groove is provided in the connecting hole of the plunger along the inner circumferential surface thereof, and a groove is provided in the part of the joint that faces the iron part. The present invention is characterized in that a storage groove is provided and a split ring is stored in the storage groove, and a set screw for expanding the split ring is provided on the plunger in correspondence with the notch of the split ring.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows the plunger mounting device of the present invention, in which the plunger 1 has a cylindrical shape, and the center thereof is a hollow portion 2 for circulating cooling water.

Further, the connecting portion 3 of the plunger 1 is provided with a connecting hole 4 that communicates with the hollow portion 2 of the plunger 1, and a groove 5 is provided along the inner peripheral surface of the connecting hole 4.

difference. Furthermore, a screw hole 6 is provided in the connecting portion 3 of the plunger so as to communicate with the groove 5, and a set screw T is screwed into the screw hole 6.

Note that the groove 5 is formed as shown in FIGS. 3 and 5.
It is preferable that the wall surface on the joint side is a tapered surface 5a.

That is, when the split ring 9, which will be described later, presses the tapered surface 5a, the plunger 1 is pressed by the joint 14, which will be described later, and the plunger 1 and the joint 14 come into close contact.

Also, when the split ring 9 is shrunk and stored in the storage groove 8, which will be described later, since one surface of the groove 5 is a tapered surface 5a, it can be shrunk smoothly.

On the other hand, a housing groove 8 is provided at the distal end of the joint 16 to be inserted into the connecting hole 4 of the plunger in a portion facing the groove 5 of the plunger, and a split ring 9 is stored in the housing groove 8 in advance. put.

The split ring 9 has a notch 1 as shown in FIG.
0 must be oriented in a direction that matches the set screw 7, for example, a protrusion 11 is provided at the bottom of the storage groove 8,
It is preferable that the protrusion 11 engages with the notch 10 of the split ring 9 to prevent the split ring 9 from rotating.

Reference numeral 12 denotes a groove for OIJ that is arranged in parallel with the storage groove 8, and an O-ring 13 is mounted in the groove 12.

A spring force is applied in advance to the split ring 9 so that the split ring 9 is restored to its original shape after expanding outward.

Furthermore, the joint 14 is screwed onto the tip of the rod 15 with a screw 16.
be done.

17 is a cooling water supply pipe installed coaxially with the rod 15 so that its tip reaches inside the hollow part 2 of the plunger. Next, the operation of the present invention will be explained.

Insert the joint 14 provided at the tip of the rod 15 into the connecting hole 4 of the plunger, and then tighten the set screw 7 with a jig (not shown) such as a screwdriver. Notch 10 of split ring 9
Get into it.

Therefore, the split ring is pushed outward and a part of the split ring 9, that is, the outer circumferential part comes to fit into the groove 5 provided in the connecting hole 4 of the plunger.

Therefore, the split ring 9 becomes an obstacle and the plunger 1 is fixed to the joint 14.

Contrary to the above, as you loosen the set screw, set screw 7
Since the split ring 9 separates from the notch 10 of the split ring, the diameter of the split ring 9 contracts due to the restoring force and fits into the storage groove 8.

Therefore, the plunger 1 can be removed from the joint 14 without being obstructed by the split ring 9.

As mentioned above, in the present invention, when installing the joint 14 in the connecting hole 4 provided at the end of the plunger 1, a groove 5 is provided in the connecting hole 4 of the plunger 1 along its inner circumferential surface, and A storage groove 8 is provided in the part of the joint 14 facing the ridge groove 5, and a split ring 9 is stored in the storage groove 8.
In addition, since the plunger 1 is provided with a set screw 7 for expanding the split ring in correspondence with the notch 10 of the split ring 9, the plunger can be replaced by simply tightening or loosening the set screw. is possible.

Therefore, only one worker is required, and the plunger can be replaced in about one-fourth to one-sixth of the time required for conventional plungers.
This will reduce the loss of operating time and further improve efficiency.

Further, since the rod is not twisted as in the conventional case when replacing the plunger, there is no possibility of damage due to twisting of the rod.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example in which a plunger is attached to a support member, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a sectional view showing an example of the present invention, and Fig. 4. is IV in Figure 3.
A sectional view taken along the line -IV, and FIG. 5 is an enlarged view of the grooves 5 and 8. 1...Plunger, 4...Connection hole, 5
...Groove, 6...Screw hole, 7...
- Set screw, 8... Storage groove, 9... Split ring, 10... Notch.

Claims (1)

[Scope of utility model registration request] A joint 14 is inserted into the connecting hole 4 provided at the end of the plunger 1.
When installing the plunger 1, a groove 5 is provided in the connecting hole 4 of the plunger 1 along its inner circumferential surface, and a storage groove 8 is provided in the part of the joint 14 facing the iron 5. This plunger mounting device houses a split ring 9 and is provided with a set screw 7 for expanding the split ring on the plunger 1 in correspondence with a notch 10 of the split ring 9.