JPH09234732A - Safety device of roll kneader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device capable of preventing the generation of an accident by detecting that the hand of worker penetrates into a dangerous region by measuring the position of the hand by electric waves to stop the rolls of a roll kneader in emergency. SOLUTION: An electric wave receiver 3 receives the electric waves from an electric wave transmitter 1 through antennae 2 and the arrival time of the electric waves is measured by an arrival time measuring circuit 4. An operation circuit 6 detects the position of the electric wave transmitter 1 on the basis of the arrival times of electric waves up to antennae arranged at three places. A judge circuit 7 judges whether the detection position of the electric wave transmitter 1 is within a dangerous region and, when the detection position is within the dangerous range, the operation of a roll kneader is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a roll kneading device used for kneading rubber materials for sealing.

[0002]

2. Description of the Related Art Rubber materials for seals used for O-rings and the like are
In the preforming step after blending and mixing the raw materials, the kneading work is performed manually by using a roll kneading device. As shown in FIG. 4, the roll kneading device 11 includes two rolls 12,
It is a device that brings 12 closer to each other and rotates them in opposite directions. These rolls 12, 12 are the saucer 1 on the stand 13.
4, both ends of the rotary shaft are rotatably supported by side plates 15, 15 which are arranged above the frame 13 and which are erected from both edges of the frame 13. Then, as shown in FIG. 5, the rotation shafts of these rolls 12 and 12 have the transmission device 1 respectively.
It is rotationally driven by being connected to a motor 17 via 6. At this time, the rolls 12 and 12 rotate faster on the side closer to the worker A shown in FIG. 4 than on the other side. Further, an electric heater (not shown) for heating is provided inside the rolls 12 and 12. A partition plate moving bar 18 is provided between the rolls 12 and 12. Then, the two partition plates 19, 19 are inserted into the partition plate moving bar 18 so as to be slidable in the axial direction of the rolls 12, 12, and the sliding positions can be fixed by the screws of the grips 20, respectively. ing.

A worker A of the kneading work inserts a rubber material B mixed with raw materials from above the roll kneading device 11 into a partition plate 1.
Insert between 9 and 19. Then, the rubber material B is sent downward through the gap between the rolls 12 and 12 as the rolls 12 and 12 rotate, and the roll 12 on the front side having a high rotation speed is rotated.
Is discharged to the worker A side along the peripheral surface of. Worker A
The rubber material B is kneaded by repeating the operation of taking out the discharged rubber material B by hand and putting it between the partition plates 19 from above again. At this time, in order to perform uniform and sufficient kneading, the worker A sequentially winds the discharged rubber material B into a cylindrical shape, and then re-injects the cylindrical rubber material B in the vertical direction. The rubber material B to be discharged is re-input while being sequentially cut with a knife. During this kneading operation, if necessary, the screws of the grip 20 are loosened to separate the partition plates 19,1.
Adjust the interval of 9.

By the way, the gap between the rolls 12 and 12 in the roll kneading device 11 is about several mm even when the rubber material B is kneaded, and 1 mm when finally finished into a thin sheet. The degree is extremely narrow. Therefore, when the worker A holds the rubber material B by hand and puts it between the partition plates 19, 19, this hand is
If the gap between the gears 2 and 12 gets too close, there is a possibility that they are caught in these rotations and are caught in a narrow gap.

Therefore, in the conventional roll kneading device 11, as shown in FIG. 4, the touch bar 21 and the microphone 22 are provided above the rolls 12 and 12. The touch bar 21 is connected with a safety device that detects that the touch bar 21 is operated by a limit switch on the base and shuts off the power supply of the motor 17. Therefore, if the operator A has his or her hand caught between the rolls 12 and 12, if the other hand pushes or pulls the touch bar 21,
The rotation of 12 can be stopped urgently. Further, the microphone 22 is connected to a safety device that detects that a loud voice is input to the microphone 22 and shuts off the power source of the motor 17. Therefore, if the operator A rolls the hands 12, 12,
If you scream between them, roll 1
The rotation of 2, 12 can be stopped urgently.

In some cases, instead of the touch bar 21, an emergency cord is stretched and a safety device for cutting off the power supply of the motor 17 is detected when the emergency cord is pulled.

[0007]

However, in the above-mentioned conventional safety device, when the worker A feels a danger because his / her hand is caught, or when the operator actually touches the touch bar 21 or the like, If worker A screams due to his or her hand being caught, the rolls 12 and 12 will be brought to an emergency stop, so immediate measures should be taken immediately before a serious accident occurs or immediately after this accident occurs. However, there is a problem in that the occurrence of an accident cannot be prevented in advance.

The present invention has been made in view of the above circumstances, and an accident is caused by detecting an operator's hand invading a dangerous area between rolls by position measurement by radio waves and making an emergency stop. It is an object of the present invention to provide a safety device for a roll kneading device that can be prevented in advance.

[0009]

That is, in order to solve the above-mentioned problems, a safety device for a roll kneading device according to the present invention comprises a radio wave transmitter attached to the hand of a worker of the roll kneading device or the like,
Radio receivers installed in two or more different predetermined locations,
Position detection means for detecting the position of the radio wave transmitter based on the radio waves received by these radio wave receivers, and dangerous area determination means for determining whether the position detected by this position detector is within a preset dangerous area And an operation stopping means for stopping the operation of the roll kneading device when the dangerous area determining means determines that the dangerous area is within the dangerous area.

According to the above means, the position detecting means detects the position of the radio wave transmitter by receiving the radio wave from the radio wave transmitter attached to the hand of the operator by two or more radio wave receivers. Since it is detected, the position of the operator's hand or the like can be constantly monitored. Then, if the danger area is set in the vicinity of the rolls of the roll kneading device in advance, in the case that the operator's hand may approach and get caught between the rolls, the danger area determination means determines this, The operation of the roll kneading device can be stopped by the operation stopping means.

[0011]

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

1 to 3 show an embodiment of the present invention, FIG. 1 is a block diagram of a safety device, FIG. 2 is a plan layout view of a working room in which a roll kneading device is installed, and FIG. It is a top view of a roll kneading device when a worker's hand invades a dangerous area. It should be noted that constituent members having the same functions as those of the conventional example shown in FIGS. 4 and 5 are denoted by the same reference numerals and the description thereof will be omitted.

In this embodiment, as shown in FIG. 2, a case where three roll kneading devices 11 are installed in a work chamber will be described. The radio wave transmitter 1 is attached to the glove which the worker A who performs the kneading work in this working room wears in his right hand. Further, an antenna 2 of a radio wave receiver 3 (not shown in FIG. 2) is installed at three corners of this work room.

As shown in FIG. 1, the radio wave transmitter 1 is
It is a transmitter that emits impulse-shaped radio waves, and it is sufficiently miniaturized so as not to interfere with work, attached to gloves, and driven by a battery or the like. The radio wave transmitter 1 is not limited to gloves, and may be directly attached to the wrist like a wristband, or may be attached to the hand or finger of the worker A, the wrist or the tip of the arm by any other method. it can.

The radio wave transmitted from the radio wave transmitter 1 is
It is received by each of the three radio wave receivers 3 via the antennas 2 installed at the above three locations. Then, the received signals received by these three radio wave receivers 3 are respectively sent to the three arrival time measuring circuits 4. Each arrival time measurement circuit 4
Is designed to receive clock pulses sent from the same clock pulse generator 5 at the same timing, and clock pulses until the radio wave receiver 3 simultaneously receives an impulse-shaped radio wave at an appropriate timing. The distance between the radio wave transmitter 1 and the antenna 2 is measured by counting the number of pulses.

Each distance data measured by the three arrival time measuring circuits 4 is sent to one arithmetic circuit 6. The arithmetic circuit 6 detects the position of the radio wave transmitter 1 by calculation from the distance between each antenna 2 and the radio wave transmitter 1. That is, for example, if the inside of the working room is coordinated in a plane and a circle with a radius corresponding to the distance data is drawn centering on the installation position of each antenna 2,
The intersection of these circles can be detected as the position of the radio wave transmitter 1. If the absolute distance between each antenna 2 and the radio wave transmitter 1 can be measured, simply install the antennas 2 at two positions on both sides of the one wall of the work room. Because the circles always intersect at one place,
It becomes possible to detect such a planar position.
Then, in this case, the antenna 2 at the third location can be used to correct the error in the detection position or detect the three-dimensional position in consideration of the height. But usually,
Since the impulse transmitted by the radio wave transmitter 1 and the pulse of the clock pulse generator 5 cannot be perfectly synchronized, the absolute distance from the radio wave transmitter 1 cannot be measured. For this reason, the time at which the radio wave transmitter 1 emits an impulse also needs to be an unknown number, so that the antenna 2 is installed at three locations as in the present embodiment to detect a planar position. Even in this case, if the antenna 2 is installed in four or more places and the radio wave receiver 3 and the arrival time measuring circuit 4 are also installed in each four or more, the three-dimensional position of the radio wave transmitter 1 can be detected. It is possible to improve the detection accuracy.

The position data of the radio wave transmitter 1 detected by the arithmetic circuit 6 is sent to the judging circuit 7. The determination circuit 7 includes a dangerous area C set by the dangerous area setting circuit 8.
Data is also entered. In this embodiment, as shown by hatching in FIG. 2, this dangerous area C is set in the peripheral area between the rolls 12 and 12 in each roll kneading device 11. Then, the dangerous area setting circuit 8 sets the dangerous area C by designating the range of a specific area in advance according to the installation state of each roll kneading device 11 in the working chamber. The determination circuit 7 determines whether the position data sent from the arithmetic circuit 6 is within the dangerous area C set by the dangerous area setting circuit 8 and sends a control signal corresponding to the determination result to each roll. Send to the kneading device 11. That is, when it is determined that the detected position of the radio wave transmitter 1 is within the dangerous area C, a control signal for instructing the operation stop is sent to the roll kneading device 11, and if it is outside the dangerous area C, the operation is continued. Send a control signal. The roll kneading device 11 continues the operation as it is when the control signal instructing to continue the operation is sent, but when the control signal instructing to stop the operation is sent, the rolls 12 and 12 are urgently rotated. It is designed to stop and stop the operation. Here, the main purpose of stopping the operation is to stop the rotation of the rolls 12 and 12 urgently. Therefore, the transmission device 16 cuts off the transmission of power not only when the power supply of the motor 17 is cut off. Such cases are also included. In order to stop the rotation of the rolls 12 and 12 in an emergency, a braking force by a brake may be applied. The control signal for instructing the operation stop may be sent only to the roll kneading device 11 having the dangerous area C where the radio wave transmitter 1 has entered, or may be sent to all the roll kneading devices 11 as a precaution. You may

With the above configuration, as shown in FIG. 3, when the right hand of the worker A enters the dangerous area C of the roll kneading device 11 during the kneading operation, the determination circuit 7 rolls the control signal for instructing the operation stop. Send to the kneading device 11. The dangerous area C is
This is a dangerous area that may be caught by the rotation of the rolls 12 and 12. It is not necessary for the worker A to insert his / her hand in normal work, so the right hand enters the dangerous area C due to carelessness or the like. To do. However, the roll kneading device 1
Upon receiving the control signal for instructing the operation stop, the No. 1 immediately stops the rolls 12 and 12 immediately. Therefore, the operation of the roll kneading device 11 can be reliably stopped before the right hand of the worker A is caught in the rotation of the rolls 12 and 12, and the occurrence of an accident can be prevented.

In the safety device of this embodiment, the radio wave transmitter 1
Since it is necessary to detect the position of 1 with an accuracy of at least about 10 cm, it is necessary to use the frequency of the clock pulse generated by the clock pulse generator 5 in the GHz order. However, if the phase difference between the impulse transmitted by the radio wave transmitter 1 and the clock pulse is measured,
This frequency can be lowered to some extent.

In order to synchronize the impulse and the clock pulse transmitted from the radio wave transmitter 1, the radio wave transmitter 1
May generate impulse-shaped radio waves in response to the radio waves transmitted from the clock pulse generator 5. Furthermore, waveforms other than such pulses can be used.

Further, in the above embodiment, the position is detected based on the distance between the radio wave transmitter 1 and each antenna 2. However, the position may be detected based on the difference in distance as in the hyperbolic navigation of a ship. it can. That is, the difference in the distance from the radio transmitter 1 to the two antennas 2 and 2 is measured, and the hyperbola whose installation positions of these two antennas 2 and 2 are the focal points (the difference in the distance from the two focal points is constant. It is also possible to draw a curve) and detect the position of the radio wave transmitter 1 from the intersection of a plurality of hyperbolas based on the two antennas 2 and 2 having different combinations. In this case, it is not necessary to consider the synchronization between the impulse transmitted by the radio wave transmitter 1 and the clock pulse generated by the clock pulse generator 5.

When the angle of the transmission source can be accurately measured when receiving the radio wave transmitted by the radio wave transmitter 1, the radio wave transmitter 1 is based on the angles measured at a plurality of positions. It is also possible to detect the position of. Further, this position detection may use any other technique using radio waves.

By the way, in the above-mentioned embodiment, the plane area around the rolls 12 in each roll kneading device 11 is set as the dangerous area C. However, the worker A can hold the grip 20 during the kneading operation. Loosen the screws on the partition plate 1
The distance between 9 and 19 may be adjusted, and in this case, the hand is forced to enter the dangerous area C. However, at this time, the hand of the worker A rolls the roll 12 even if it is in the dangerous area C.
There is no particular danger because it is sufficiently above. Therefore,
When the position of the radio wave transmitter 1 is three-dimensionally detected, if the height direction of the dangerous area C is limited to a position relatively close to the roll 12 and above, the adjustment work of the partition plates 19 can be performed. In this case, it is possible to eliminate the inconvenience that the roll kneading device 11 stops its operation. Further, for example, while the operation switch provided at the foot of the roll kneading device 11 is being operated, the operation should not be stopped even if the control signal instructing the operation stop is sent from the determination circuit 7, Unnecessary stoppage of operation can be avoided by stepping on the operation switch with the foot only when the worker A performs the adjustment work of the partition plates 19, 19.

Further, in the above embodiment, the radio wave transmitter 1 is attached only to the right hand of the worker A, but it can be attached to both hands. The radio wave transmitter 1 may be attached to a plurality of workers A. In these cases, the radio wave from each radio wave transmitter 1 is distinguished by the timing and frequency of the impulse, and the position detection is performed individually for each radio wave transmitter 1. The operation of the roll kneading device 11 can be stopped when it enters the inside.

In the present invention, the position of the hand of the worker A is detected by using the radio wave from the radio wave transmitter 1. An acceleration sensor such as a piezoelectric vibration gyro is attached to this hand, and the acceleration detected here is detected. It is also possible to detect the position by accumulating at any time.

[0026]

As is apparent from the above description, according to the safety device of the roll kneading apparatus of the present invention, the danger of the worker's hand getting caught between the rolls is detected in advance and the roll kneading apparatus is used. Since the operation is stopped, a serious accident can be prevented from occurring, and a safe working environment can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of a safety device according to an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention and is a plan layout view of a working chamber in which a roll kneading device is installed.

FIG. 3 shows an embodiment of the present invention and is a plan view of a roll kneading device when an operator's hand enters a dangerous area.

FIG. 4 shows a conventional example and is a vertical cross-sectional side view for explaining the structure of a roll kneading device.

FIG. 5 shows a conventional example and is a plan view of a roll kneading device.

[Explanation of symbols]

 1 Radio wave transmitter 3 Radio wave receiver 4 Arrival time measurement circuit 6 Calculation circuit 7 Judgment circuit 11 Roll kneading device A Worker C Danger area

Claims (1)

[Claims] 1. A radio wave transmitter attached to the hands of a worker of a roll kneading machine, a radio wave receiver installed in two or more different predetermined locations, and a radio wave transmitter based on radio waves received by these radio wave receivers. Position detection means for detecting the position of the machine, dangerous area determination means for determining whether the position detected by the position detector is within a preset dangerous area, and this dangerous area determination means is within the dangerous area. A safety device for a roll kneading device comprising: an operation stopping means for stopping the operation of the roll kneading device when judged.