JPS5979743A - Mechanism for detecting abnormality of rubber extruder - Google Patents

Abstract

PURPOSE:To make it possible to monitor the supply state of rubber in a concentrated manner while detecting the abnormality in the supply state thereof, by providing a detection mechanism for detecting the feed cut of a rubber strip on the way of the rubber material supply path to the hopper of an extruder. CONSTITUTION:In each extruder 1 of a crosshead type extruder, a feed cut detecting mechanism 4 is provided on the way of a supply line of a rubber material (g) to the hopper 30 of a strainer 3 from a supply part 2 and the detection of abnormality is performed by the detction of the rotary number of the roller 40 thereof. On the other hand, a rubber pressure rising detection mechanism 5 is provided to the leading end of the strainer 3 and the clogging of the mesh part of said strainer 3 is detected by the pressure detection thereof. In addition, the rubber strip (g') sent out from the strainer 3 is supplied to the hopper 10 of the extruder 1 but the width thereof is detected by the guide rolls 61, 61' of a feed cut detection mechanism 6 and, if the width thereof becomes narrow, a limit switch 64 is operated to detect the feed cut. These signals are sent to a concentrated display panel and monitored in a concentrated manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality detection mechanism for a rubber extruder, and particularly aims to provide a system that can quickly and reliably detect abnormalities in the supply of rubber, which is a raw material.

Conventionally, in a rubber extruder, a rubber material heated by a forming roll is cut into thin strips and continuously supplied to the extruder or a hopper of a strainer.
It is a common practice to feed rubber strips (thin strips of rubber) to the hopper of the extruder through a strainer, but if there is a shortage of these rubber materials or abnormal feeding, the finished product will be poor. It was necessary to constantly monitor the extrusion process as it could cause problems or interfere with the extrusion process. For example, if the supply of rubber material to the extruder is temporarily cut off, the shape and dimensions of the product may deteriorate, such as the thickness of the product becoming thinner. Miyako ga Mezuichi 1! If this happens and the rubber pressure increases abnormally, the mesh in the second part will open and become deformed, causing dirt and debris to form.
Foreign objects such as stones are directly fed into the extruder main body, and VcJ+4 objects get mixed into the product, causing product defects. Therefore, in the past, workers were constantly patrolling and supplying rubber to the extruder. Inspect for abnormalities and supply GofSJ yourself. I was in a state of turmoil and ecstasy.

However, in factories that operate multiple extrusion molding lines in the same location, a large number of personnel are required to carry out the above-mentioned patrol inspections, and the time and effort required for such inspections is extremely troublesome, and there is a risk of overlooking abnormalities or delaying their discovery. As a result, products often lack meat or contain foreign substances, and improvements have been desired.

Therefore, in this development, we have made it possible to detect and intensively monitor abnormalities in the rubber supply mentioned above, so that abnormalities can be quickly recovered and extrusion production can be carried out in good condition at all times. is provided with a detection mechanism for detecting the feed 9J I″L of the rubber strip in the route for supplying the rubber material barbs to the hopper of the extruder and/or in the route for supplying the rubber material from the strainer to the hopper of the extruder,
An embodiment of the present invention, which is characterized in that the end of the rubber strip can be detected by electrical output from the detection mechanism, will be exemplified below with reference to the drawings.

The rubber extrusion a shown in the drawing exemplifies the case of a crosshead extruder for producing a two-layer rubber product by combining two extruders (1) and (1).

Each extrusion 49 (1) has a supply section (
2) and a strainer (3) for removing foreign matter from rubber materials.
) is provided, and the rubber material (g) is supplied r<i+ (2
) into the hopper of the strainer (3), and the mesh at the head of the strainer (3)
After removing foreign substances, the rubber strip is continuously supplied to the hopper 001 of the extruder (1), and then extruded from the tip of the extruder (1) as a product (G). (See Figure 1).

In the pre-process general stage of this invention, (4) is a supply end detection mechanism for the rubber material value), and the rubber l' Ft from the supply section (2) to the hopper (2) of the strainer (3).
(g) A VC is provided in the middle of the supply route. Concretely, a circle @ (42) with nine notches (4I) formed at an easy distance in the inward direction is placed coaxially with a part of the roller (4o) for supplying the KVi rubber material Jil (g), and this Circle CI'i 14k K l
A proximity switch (43) is provided adjacently.

Then, the rotation of the roller f401, that is, the rotation of the disk (upside down),
It can be measured by counting the IJ missing (41) by turning the proximity switch (43) (see Figures 2 to 4 and 1).

(・Y and roll the rubber tA'l"I on the roller (4o)
When the rubber material (g) is being fed normally, a constant number of revolutions d1 is measured, but when a supply failure of the rubber material (g) occurs, the rotation of the roller 140) decreases, and the proximity switch (431) stops the rotation. It detects an abnormality in the number and outputs an electrical value.Specifically, V'CVi, [l] When the board ((4) stops, the same 1; + fl is applied to the proximity switch (431), When the same signal is counted 8 times, a timer is set, and if 5 seconds or more have elapsed in this state, an abnormality notification will be made as appropriate.

In addition to measuring the number of revolutions of the roller (40) shown in the figure, the mechanism (4) for detecting the out-of-supply of the rubber tJ PI (g) mentioned above can also be used to directly detect the presence or absence of rubber tJ PI (g) using a phototube or microswitch. or roller i4
Various detection mechanisms can be used, such as one that detects the weight load of +11K plus Walcom tA barbs (g).

Next, at the tip of the strainer (8), (5) is a rubber pressure increase detection mechanism, which is used to detect when the rubber pressure has abnormally increased beyond a specified value. ) Pressure gauge with pressure switch on the head part ω)
is provided so that when a pressure above a certain pressure (usually about 150 N/cJ) is measured, an electrical signal can be output to notify an abnormality (see Fig. 5).

The abnormality in the rubber pressure mentioned above occurs when the mesh part of the head part is clogged with foreign matter caused by poor dispersion of the compounded chemicals in the compounded rubber itself, or with deposits from the rubber material. It is necessary to replace the wire mesh etc. in the mesh part.

Next, a mechanism (6) for detecting the end of feed of the rubber strip 1, which is a feature of the present invention, will be explained.

The rubber strip (g) is fed out from the strainer (8) as a continuous band-like body, and is transferred to a conveyor mechanism (6 (2)) as appropriate.
The comstrip (g) is fed to the hopper (101) of the press IJ-1h (+) at the hopper (101).In practice, the comstrip (g) may be fed directly to the bobber (1111) via the strainer (3).

It is a guide roll that regulates the
61) is provided so as to be movable in the Φtij direction of the rubber strip (g), and the spring (6 (2) can be moved 1 (K) so that the guide roll (G1) can elastically abut against the side surface of the rubber strip (g). (63) is a cam that can move together with the guide roll (61), and ('
34) is a limit switch provided in the travel path of the cam (63), and is activated by the travel i[νJIC of the cam (63).

When the width of the rubber strip (g) becomes narrower than the specified value by a certain amount (for example, 5 stations or more), the rubber strip (g) springs and activates the limit switch (6(1)) to output an electrical signal. i.e. rubber strip value) feed 9j
If this is the case, insufficient feed speed is detected as a decrease in the width of the rubber strip (g) (see Figure 6).

In addition, the above-mentioned rubber strip (g) end-of-feed detection mechanism includes one that measures the rubber strip value shown in the figure), as well as a conveyor mechanism (6) that uses a weight measuring section and a photocell to measure the rubber strip (g). Various detection mechanisms can be adopted, such as setting up a prenatal detection section.

Next, a mechanism for displaying the electrical output of each of the above-mentioned detection mechanisms (4), (5), (6) #) will be illustrated.

(7) H is a centralized display panel that can simultaneously display the presence or absence of abnormalities for multiple extruders (for example, two systems in the seal system) of multiple extrusion manufacturing lines (two systems in the figure). For example, abnormality detected from the rubber supply end detection mechanism (3) is indicated by a yellow indicator light (70), and abnormality detected from the rubber pressure increase detection mechanism (5) is indicated by a green indicator light (71).
), and the detection of an abnormality from the feeding rubber breakage detection mechanism (6), which requires a more rapid response, is displayed on the easily visible red indicator light C, and the line number where the abnormality was detected is displayed. is displayed with a red indicator light (73).

In addition, the display panel (7) has the same display on the front and back, forming a so-called andon-like structure, and the entire display panel (7) can be hung inside the factory, making monitoring work easier. It has become easier to do. Further display panel (7)
At the same time, if an alarm such as a buzzer is issued upon detecting an abnormality, more reliable abnormality detection can be performed, which is very convenient (see FIG. 7).

Note that various known mechanisms that have been used conventionally can be used as the display mechanism.

According to this starting point j configured as above, among the abnormalities in the supplied rubber processed by the extruder, the rubber strip (1) directly supplied to the extruder (1) is particularly important and must be dealt with immediately. g) The end of feeding can be detected quickly and appropriately (16') for automatic fishing, and it is possible to prevent damage to processing and deterioration of product finish due to the above abnormalities during extrusion work.Especially when supervisors Since the time and effort of constantly inspecting the extruder can be saved, it is possible to save labor and prevent failures due to inspection errors, and to promote efficiency of the entire work.

[Brief explanation of drawings]

The figures illustrate embodiments of the present invention. 1. FIG. 1 is a plan view of the overall schematic configuration, FIG. 2 is an enlarged plan view of the out-of-supply detection mechanism, FIG. 8 is an enlarged cross-sectional view of main parts, and FIG. 5 is an enlarged sectional view of the rubber pressure increase detection mechanism, FIG. 6 is an enlarged sectional view of the feed 9J deviation detection mechanism, and FIG. 7 is a perspective view of the display panel. (1)...Extruder (+01...Hopper (2)...Rubber supply section (3)...
...Strainer field...Hopper (
4)... Out-of-supply detection mechanism (5)...
Rubber pressure increase detection mechanism (6)...Feed-out detection mechanism (6o)...Conveyor (61)...
・・Guide roll country・・・・Spring (63
)...Cam (64)...Limit switch (g)...Rubber material Pl (G)...
product. Special “P applicant” Sumitomo Rubber Industries, Ltd.

Claims (1)

[Claims] 1. Detection for detecting the end of feed of the rubber strip in the route for supplying the rubber material to the hopper of the extrusion plate and/or the route for supplying the rubber material from the strainer to the hopper of the extruder. An abnormality detection mechanism for a rubber extruder, characterized in that a checkerboard is provided and the end of feed of the rubber strip can be detected by electrical output from the detection mechanism. 2. As a detection mechanism, the rubber strip elastically abuts against the edge of the supplied rubber strip in the width direction and moves in the width direction.
It is made by moving a guide roller equipped with a functional VC and a cam installed at one end of the guide roller! 1IIJ limit switch and the above INJ-d to i4f'J required range 1st JJI abnormality detection for rubber extrusion machine 3J 4r,,l
'; Ik. 3. Create indicator lights and alarm devices using the electrical output from the detection coffin! An abnormality detection mechanism for a rubber extruder according to claim 1, which causes an abnormality in a rubber extruder to cause an abnormality.