JPS6240672Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Industrial application field This invention relates to a twin-screw kneader for kneading sticky raw materials mainly composed of powder and liquid polymer.

(2) Prior art The ones shown in Figures 4 and 5 are published under the Japanese Patent Publication No. 54-17189.
This is a twin-screw kneader described in No.

In this figure, 1 is a casing equipped with a pair of left and right rotating shafts 2, and each rotating shaft 2 is provided with a kneading blade 3. Further, a discharge port 3' is provided at the lower end of the casing 1, and a resistance blade 4 is provided on the rotating shaft 2 at this portion.

Furthermore, sheaths 5 surrounding the upper and lower parts of the resistance blades 4 are provided above and below the portion of the resistance blades 4, and these upper and lower sheaths 5 are opened and closed by left and right adjustment bolts 6 attached to the casing 1, and the outer periphery of the resistance blades 4 and the sheaths 5 are The gap between the inner circumferences can be adjusted. By adjusting this gap, the pressure of the raw materials in the casing 1 is maintained to achieve uniform kneading.

(3) Problems to be solved by the invention In the case of the above-mentioned conventional technology, the fluctuating pressure inside the casing is detected through some kind of detection means, and the adjustment bolt is turned by an amount corresponding to the detected value. Since the casing is opened and closed, there is a problem in that the response to pressure fluctuations within the casing is poor. Therefore, the purpose of this invention is to improve the responsiveness of the raw material to changing pressure.

(4) Means for solving the problem In order to solve the above problem, this invention provides a sliding plate on the part of the rotating shaft located above the discharge port, which is slidable over the entire length of the discharge port. An elastic means is provided between the rear plate and the rear end of the casing to press the rear plate toward the supply port.

(5) Operation When the mixture reaches the discharge port after being mixed in the casing, the pressure of the mixture presses the stopper against the elastic means and the stopper is extruded from the discharge port. At this time, the stopper immediately responds to the fluctuating pressure of the mixture in the casing and increases or decreases the opening area of the extrusion port, so that the mixing pressure in the casing is always kept constant.

(6) Embodiment In FIG. 1, reference numeral 11 denotes a casing having a cooling jacket 12 for passing cooling water, etc., both ends of which are closed, and a supply port 13 is provided at the top of one end and a discharge port 14 is provided at the bottom of the other end.

As shown in FIGS. 2 and 3, the cross section of the casing 11 has a shape in which two circles partially overlap and the overlapping portions communicate, with a pair of left and right rotating shafts 15 passing through the center of each circle. be.

The end of the rotating shaft 15 on the supply port 13 side is rotatably supported by a bearing 16 at the end of the casing 11, and is driven by a drive means (not shown). The end of the rotating shaft 15 on the discharge port 14 side is rotatably supported by a bearing 18 provided on a side plate 17 provided inside the casing 11.

The partition plate 17 is attached to the casing 1 as shown in FIG.
The sleeve 19 has a size and shape that fits into the inner periphery of the shaft 1 with a slight gap, and moves forward and backward over the entire length of the discharge port 14, and a sleeve 19 that surrounds the outside of each shaft 15 is integrally provided at the rear thereof. There is.

Each sleeve 19 slidably passes through the opening at the end of the casing 11 while maintaining airtightness, and enters a spring case 20 fixed to the outer end of the casing 11. A threaded rod 21 is fixed to each outer end of the sleeve 19, and the threaded rod 21 is movably passed through the center of an adjustment screw 22 screwed into a female thread at the outer end of the case 20.

Further, a spring 23 serving as an elastic means for pushing the sleeve 19 is fitted into a threaded rod 21 in the case 20, and the rear end of the spring 23 is supported by the adjustment screw 22, so that the elasticity of the spring 23 can be freely adjusted. At the same time, a nut 28 as a stopper is screwed into the outer end of the threaded rod 21.

24 in FIG. 1 is a feed screw fixed to the rotating shaft 15 in a portion directly below the supply port 13;
is a reverse feed screw fixed to the rotating shaft 8 in front of the discharge port 14. Also, Screw 2
A large number of paddles 26 are fixed to the rotating shaft 15 between 4 and 25, and a paddle 27 is also provided on the discharge port 14 side of the reverse feed screw 25.

In the above embodiment, when powder and liquid polymer are introduced into the supply port 13 while rotating each rotating shaft 15 by an appropriate driving means, these raw materials are fed by the screw 23 toward the group of paddles 25, and these raw materials are While being kneaded by each paddle 25, it is gradually sent toward the discharge port 14.

The raw materials kneaded in this way pass through the plate 17 to the spring 2.
3 and exits from the discharge port 14 while being pushed open.

The internal pressure generated by the kneading action of the paddles in the casing 11 changes depending on the operating conditions such as the properties of the material to be processed, the supply amount, the temperature, and the rotation speed of the rotating shaft 15, but this pressure is defined as P ₁ . do.
Further, if the discharge pressure generated by the throttling effect of the discharge port 14 by the stop plate 17 is P ₂ , the required holding pressure P is P=P ₁ +P ₂ . In order to keep the required holding pressure P constant here, since the internal pressure _P1 increases or decreases due to the factors mentioned above, by supplementing this increase or decrease with the pressure _P2 , the holding pressure can be kept constant.

(7) Effects As mentioned above, this device uses elastic means to press the plate, and the plate automatically advances and retreats due to the pressure of the raw materials being kneaded in the casing, thereby adjusting the pressure. , there is no need for any external actuating device to actuate the plate, and the structure is simple and easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of essential parts showing an embodiment of the kneading machine of this invention, Fig. 2 is an enlarged longitudinal sectional front view taken along line A-A in Fig. 1, and Fig. 3 is an enlarged longitudinal sectional view taken along line B-B in Fig. 1. FIG. 4 is an enlarged longitudinal sectional front view, FIG. 4 is a longitudinal sectional side view of essential parts showing an example of a conventional kneading machine, and FIG. 5 is a longitudinal sectional front view of the same. 11...Casing, 13...Supply port, 14...
...Discharge port, 15... Rotating shaft, 17... Seki plate, 2
3... Spring, 26, 27... Paddle.

Claims (1)

[Scope of utility model registration request] In a two-shaft kneading machine in which two rotating shafts are arranged in parallel in a casing having a supply port on one side and a discharge port on the other side, and a number of paddles are fixed to each of the rotating shafts, the discharge port of the rotating shaft is A sliding plate is provided in the upper part of the discharge port, and an elastic means is provided between the separating plate and the rear end of the casing to press the separating plate toward the supply port. A two-shaft kneading machine featuring the following.