JPH0698623B2 - Automatic kneading device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic kneading device,
More specifically, the present invention relates to an automatic kneading device for kneading a powdery material supplied onto a gap between a pair of heating rolls and rotating a roll sheet around the peripheral surface of the heating roll.

[0002]

2. Description of the Related Art A kneading machine has a pair of heating rolls arranged in parallel. Using this heating roll, for example, a resin sheet is prepared as follows.

A predetermined amount of a predetermined resin powder is supplied between the heating rolls. Since there is a slight gap between the pair of heating rolls, most of the resin powder is mounted above the gap between the pair of heating rolls even if a small part of the resin powder may fall through the gap. Store in a shape.

Therefore, by heating the heating roll to a predetermined temperature and rotating the pair of heating rolls,
Shearing and heat energy are applied to the resin powder on the heating roll. The resin powder itself generates heat by applying a shearing force by the heating roll.

The resin, which has been in a semi-molten state due to the heat generated by the resin powder itself and the heating by the heating roll, is dripped into a sheet form from the gap between the pair of heating rolls which is slightly further widened.
The sheet-shaped tip portion is further hung by the rotation of the heating roll, and the sheet-shaped tip portion is wound around the heating roll. As a result, in the pair of heating rolls, the resin in a semi-molten or molten state is wound around one heating roll in a sheet shape, and the molten resin is accumulated in the gap between the pair of heating rolls. It becomes a state that exists. The pool of molten resin may be referred to as a bank.

If kneading is performed for a predetermined time in this state, the pool of molten resin becomes smaller with the passage of time, and the thickness of the sheet wound around the heating roll increases as well. With the molten resin pool completely disappeared, the kneading by the heating roll is stopped and the resin sheet is separated from the heating roll.

In the conventional kneading apparatus for performing the above kneading operation, the gap size between the pair of heating rolls is predetermined, and the gap between the pair of heating rolls increases as the thickness of the sheet wound around the heating roll increases. It is like this. The rotating direction of the heating roll during kneading is such that the bank is rolled up.

In the conventional kneading machine, the operator who operates the kneading machine operates the kneading machine depending on his own experience and intuition. Therefore, in the conventional kneading apparatus, it cannot be said that the kneading operation is always performed under the optimum conditions, and the kneading operation procedure is individually performed by the operator, and there is a problem that the degree of kneading is not always constant. there were.

[0009]

According to the present invention for solving the above-mentioned problems, a pair of heating rolls capable of adjusting the gap length thereof and varying the rotation direction and the rotation speed are provided. The heating temperature of the heating roll is measured, a temperature sensor that outputs temperature measurement data indicating the measured temperature, the rotation state of each of the heating rolls is detected, and a rotation state sensor that outputs each detection data, and the pair of A position sensor that measures the gap between heating rolls, a bank sensor that detects the state of the bank existing in the gap between the pair of heating rolls, and various data output from the various sensors are input to the pair of heating units. The relative distance between each pair of heating rolls, the heating temperature, and the rotation direction so that the formation and disappearance of banks in the roll gap are repeated a required number of times. It is a control means for automatically controlling the fine rotational speed is an automatic kneading apparatus according to claim.

[0010]

According to the automatic kneading apparatus of the present invention, first, the predetermined amount of the raw material powder is supplied onto the pair of heating roll gaps adjusted to the minimum roll gap, and the heating rolls are heated to the predetermined temperature. The heat and shearing force of the heating rolls are applied to the raw material powder by rotating the pair of heating rolls in the normal direction or in the opposite direction. The heating temperature of the heating roll is monitored by a temperature sensor, and the state of the bank formed in the gap between the heating rolls is monitored by the bank sensor. As the bank sensor, a sensor having a function capable of detecting the presence of a bank being formed between the heating rolls or the formed bank, such as a heating roll torque meter, or a non-contact type thermometer, is used. Can be mentioned.

When the powdery material is gradually kneaded by the heating of the heating roll and the shearing by the rotation, the gap of the heating roll, the heating temperature, the rotating direction, and the rotating speed are further adjusted by the control means, and Continue kneading the materials.

As a result of the kneading, when a bank in which the raw material is melted is formed between the heating rolls, the control means determines the optimum gap between the heating rolls, the heating temperature, the rotating direction, and the rotating speed, and the optimal Continue kneading under the conditions.

After the kneading is continued for a certain period of time with the bank formed, the gap between the heating rolls is expanded by the control means, and the heating temperature, the rotating speed and the rotating direction of the heating rolls are optimally adjusted, and The existing bank disappears, and the sheet of the material kneaded on one heating roll is rotated.

After the sheet of material is rolled into one of the heating rolls and the bank between heating rolls disappears, the gap between the heating rolls is narrowed again by the control means, and the heating temperature and rotation of the heating rolls are increased. A bank is formed in the gap between the heating rolls by adjusting the speed, the rotation direction and the like. The material is kneaded with a heating roll for the same period with the bank formed.

After the kneading is continued for a certain period of time with the bank formed, the gap between the heating rolls is expanded by the control means, and the heating temperature, the rotation speed and the rotation direction of the heating rolls are optimally adjusted, and the heating rolls are separated from each other. The existing bank disappears, and the sheet of the material kneaded on one heating roll is rotated. In this way, the formation and disappearance of the bank between the heating rolls are repeated a required number of times. As a result, a fully kneaded sheet is obtained.

[0016]

EXAMPLE FIG. 1 is a sectional view showing a pair of heating rolls in a kneading apparatus according to an example of the present invention.
As shown in FIG. 1, the pair of heating rolls 1 are arranged so that their roll axes are parallel to each other and face each other. The pair of heating rolls 1 can adjust the mutual interval L of the pair of heating rolls 1 by a driving device (not shown), and can heat each heating roll 1 to a predetermined temperature by a heating unit (not shown), Further, each of the pair of heating rolls 1 can be rotated at its own rotation speed and rotation direction by a drive source (not shown).

A temperature sensor for detecting a heated temperature is installed on the pair of heating rolls 1.
A rotation state sensor that detects the rotation direction and the rotation speed of the pair of heating rolls 1 is installed, a position sensor that detects the gap between the pair of heating rolls 1 is installed, and a reservoir stored on the gap between the pair of heating rolls 1 such as a mount A bank sensor is installed to detect the stored powder material or a bank that has become semi-molten or melted.

The temperature sensor may be a thermocouple, an infrared radiation thermometer, or the like. As the rotation state sensor, for example, a tachogene rotary encoder or the like may be used to detect the rotation speed of the heating roll 1. A rotary encoder or the like can be used to detect the rotation direction, a laser displacement sensor or an ultrasonic displacement sensor can be used as the position sensor, and a non-contact thermometer such as an infrared radiation temperature can be used as the bank sensor. There may be mentioned, for example, a combination of a light emitting means for projecting light in the roll axial direction in the vicinity of the gap between a pair of rolls and a light receiving sensor for receiving the light.

The kneading apparatus according to this embodiment comprises the pair of heating rolls 1, the temperature sensor 3, the rotation state sensor 4, a position sensor 5 as shown in FIG.
The bank sensor 6, the heating means 7 for heating the heating roll 1, the drive device 8 for determining the gap between the heating rolls 1, and the drive source 9 for determining the rotation speed and the rotation direction of the heating roll 1.
And a control means 10 for inputting detection signals from the various sensors and controlling the heating means 7, the drive device 8 and the drive source 9 in accordance with the state and amount of the storage existing in the gap between the pair of heating rolls 1. Have and. Although not shown in FIG. 2, this kneading device has an input unit such as a keyboard capable of inputting various data and control commands to the control unit 10.

Next, the operation of this embodiment will be described.
As shown in Step 1 in FIG. 3, the control means 10 is operated according to the heating temperature previously input by the input means.
A heating control signal is output from the heating means 7 to the heating means 7.
Thereby, the heating roll 1 is heated to a predetermined temperature. This heating temperature varies depending on the type of material, and when the material is usually vinyl chloride resin or silicone resin, it is set to a temperature about 10 ° C. higher than the processing temperature of such resin. This set temperature is input to the control means 10 by the keyboard.

As shown in Step 2 in FIG. 3, the control means 10 outputs a gap control signal to the driving device 8 so that the distance L between the pair of heating rolls 1 becomes a predetermined dimension. The relative position is adjusted.
In the initial state, the distance L between the pair of heating rolls 1 is usually about 0.2 mm.

As shown in FIG. 1, a predetermined amount of powdery material 11 is stored on the space between the pair of heating rolls 1 adjusted to the space L (see FIG. 1). Since the pair of heating rolls 1 has the above-described interval L, when the powdery material is supplied between the heating rolls 1, the interval L is set.
Although the powdery material 11 may leak out from the powdery material, the amount of such material leaking out is small, and since the particles of the material usually form a bridge in the interval L between the pair of heating rolls 1, the powdery material 11 is almost immediately powdered. The dropping of the material 11 through the interval L stops.

As shown in Step 3 of FIG. 3, the control means 10
By outputting a drive control signal to the drive source 9, the pair of heating rolls 1 rotate at a predetermined rotation speed in a predetermined rotation direction. In this case, although it depends on the type of material, generally speaking, the rotation speed and the rotation direction of the heating roll 1 are set so that the mount-shaped powdery material 11 is fused to each other by the heating roll 1. It is decided and kneaded. As an example, for a certain material, the drive source 9 is controlled so that, for example, the rotations of the pair of heating rolls 1 are opposite to each other and that the pair of heating rolls 1 rotate at a low rotation speed. In some cases, the rotation directions of the pair of heating rolls 1 are the same, the rotation speeds of the pair of heating rolls 1 are different from each other, and the rotation speeds of the pair of heating rolls 1 are low. Controlled. In short, the heating roll 1 such that a large shearing force and heating energy by the heating roll 1 are applied to the powdery raw material 11 existing on the pair of heating rolls 1 so that the particles of the powdery raw material 11 are fused to each other. The rotation speed and the rotation direction of are determined by the control means 10.

Then, the heating temperature by the heating roll 1 is maintained, and the kneading is continued while the rotating direction and the rotating speed of the pair of heating rolls 1 are maintained.

When the kneading is continued and the particles of the powdery raw material 11 are fused to each other, a bank is formed on the heating roll 1 and the volume of the bank becomes substantially constant. As the torque applied to the
A detection signal is output to the control means 10 from the bank sensor that detects the decrease in the torque applied to the control means 10.

If the detection signal is not output by then, the control means 10 judges that the bank is not formed, and as shown in Step 3, Step 1
Then, the interval L of the heating roll 1 is adjusted, or the heating temperature of the heating roll 1 is adjusted, and the rotation speed and the rotation direction of the heating roll 1 are adjusted. In addition, in FIG. 3, Step
1 shows the temperature adjustment of the heating roll 1, Step 2 shows the interval adjustment of the heating roll 1, Step 3 shows the adjustment of the rotation speed and the rotation direction of the heating roll 1, and
Although it is shown that the procedure of Steps 1 to 3 is executed, the procedure of Steps 1 to 3 is not limited to the procedure shown in FIG. That is, these Steps 1 to 3 may be executed at the same time, or the reverse procedure may be executed.

When the material bank is formed at the interval L between the heating rolls 1, the control means 10 outputs a temperature control signal to the heating means 7 to change the temperature to a predetermined temperature (Step 5).
The interval L between the heating rolls 1 is gradually changed (Step 6), and the rotation speed and the rotation direction of the heating rolls 1 are kept constant (Step 7).

Usually, the heating temperature in the heating roll 1 at this time is the processing temperature of the material, and the rotating directions of the heating roll 1 are adjusted in opposite directions such that the bank is wound into the space L between the heating rolls 1. . The rotation speed of the heating roll 1 is adjusted to an optimum speed according to the type of material.

As shown in FIGS. 4 and 5, the heating roll 1
As the kneading of the bank 12 is performed and the distance L between the heating rolls 1 is gradually increased, the sheet 13 is rolled into one of the heating rolls 1, and the sheet 13 is rolled into a roll shape. The thickness increases. In this state, the steady operation by the heating roll 1 is performed for a certain period of time to knead the material (Step 8). Bank sensor 6 is heating roll 1
The banks 12 existing on the interval of
9), the bank sensor 6 that detects the presence of the bank 12 on the heating roll 1 outputs the detection signal to the control means 10.
The control signal receives the detection signal, and controls the heating means 7, the driving device 8, and the driving source 9 so that the heating roll 1 operates in a steady state.

When this steady operation is continued for a certain period of time, as shown in FIG.
The bank 12 on the gap between the heating rolls 1 disappears as shown in FIG. When the bank sensor 6 that has detected the disappearance of the bank 12 outputs a detection signal to the control means 10, the control means 10
Outputs a drive control signal to the drive unit 8 to drive the drive unit 8 so as to narrow the gap L between the pair of heating rolls 1 (Step 10). When the interval L between the heating rolls 1 is reduced, the thickness of the roll-shaped sheet 13 that has been wound around the heating roll 1 before then decreases, and the banks 12 start to be formed in the intervals between the heating rolls 1.

The bank sensor 6 monitors the banks 12 formed between the heating rolls 1, and a certain number of banks 12 are provided.
When the bank sensor 6 detects that the bank is not formed, the detection signal is output to the control means 10, and the control means 1
For 0, fine adjustment is performed so as to further reduce the interval L of the heating roll 1 (Step 11, Step 10).

When the bank sensor 6 detects that a predetermined amount of banks 12 are formed on the heating roll 1, the control means 10 which has received the detection signal output from the bank sensor 6 rotates the heating roll 1 at a constant speed. The heating means 7, the driving device 8 and the driving source 9 are controlled so as to maintain the speed and the constant heating temperature and perform the steady operation (Step 12). On the other hand, the control means 10 has a coefficient for the number of times the bank sensor 6 outputs the detection signal for forming the bank 12, and when it is confirmed that the number of times is not reached in advance, the control means 10 drives the heating means 7 and the drive means. A control signal is output to the device 8 and the drive source 9, and Steps 5 to 7 are repeated so that the bank 12 existing between the heat sensitive rolls disappears.

As described above, the control means 10 inputs various detection signals output from the temperature sensor, the rotation state sensor, the position sensor, and the bank sensor 6 and adjusts the interval of the heating roll 1 according to a predetermined program. Then, the formation and disappearance of the bank 12 are repeated a predetermined number of times. After repeating the formation and disappearance of the bank 12 a predetermined number of times, the rotation and heating of the heating roll 1 are stopped and the kneading is completed.

Thus, in this embodiment, by automatically controlling the pair of heating rolls 1 by the control means 10,
Powdery material 1 stored in a mount on the heating roll 1
Since 1 is kneaded and brought into a molten state or a semi-molten state and then kneading is performed, and the formation and disappearance of the bank 12 formed in the shape of the heating roll 1 are repeated a predetermined number of times, the kneading of the material can be performed extremely uniformly.

[0035]

According to the automatic kneading apparatus of the present invention, the control means controls the heating means and the heating means based on various detection signals output from the temperature sensor, the rotation state sensor, the position sensor, and the bank sensor. The drive device that determines the mutual distance between the rolls, the drive source that determines the rotation direction and the rotation speed of the heating roll are controlled to the optimum state according to the state of the bank formed on the heating roll, Since formation and disappearance are repeated a predetermined number of times, kneading can be performed uniformly.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a state in which a material on powder is stored in a gap between heating rolls.

FIG. 2 is a schematic block diagram showing a kneading device which is an embodiment of the present invention.

FIG. 3 is a flow chart showing a control execution program in the control means in the kneading device which is an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state in which a bank is formed on a gap between heating rolls.

FIG. 5 is an explanatory diagram showing a state in which a bank formed on a gap between heating rolls disappears, and a sheet is wound around the heating roll in a roll shape.

[Explanation of symbols]

 1 Heating Roll 3 Temperature Sensor 4 Rotational State Sensor 5 Position Sensor 6 Back Sensor 7 Heating Means 8 Driving Device 9 Driving Source 10 Control Means 11 Powdery Material 12 Banks

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Nogami 3-43-2 Ebisu, Shibuya-ku, Tokyo Nikkiso Co., Ltd. (72) Takashi Kimura 3-43-2 Ebisu, Shibuya-ku, Tokyo Hi Kisou Co., Ltd. (72) Inventor Masaaki Suzuki 3-43-2 Ebisu, Shibuya-ku, Tokyo Nikkiso Co., Ltd. (72) Takashi Chino 3-43-2 Ebisu, Shibuya-ku, Tokyo Nikkiso Incorporated (72) Inventor Keisuke Kato 3-43-2 Ebisu, Shibuya-ku, Tokyo Nikkiso Co., Ltd. (72) Inventor Yoshihisa Hiraguri 3-43-2 Ebisu, Shibuya-ku, Tokyo Nikkiso Co., Ltd. Within

Claims (1)

[Claims] 1. A pair of heating rolls whose mutual gap lengths can be adjusted and whose rotation direction and rotation speed can be varied, and a heating temperature of the heating rolls which is measured to measure the temperature. A temperature sensor that outputs data, a rotation state sensor that detects each rotation state of the heating rolls, and outputs detection data of each, a position sensor that measures a gap between the pair of heating rolls, and a pair of heating units. A bank sensor that detects the state of the bank existing in the gap between the rolls and various data output from the various sensors are input, and formation and disappearance of the bank in the pair of heating roll gaps are repeated a required number of times, It is provided with a control means for automatically controlling the relative distance, heating temperature, rotation direction and rotation speed of each pair of heating rolls. Automatic kneading device to collect.