JP3155486B2 - Safety equipment for roll kneading equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll kneading apparatus used for kneading a rubber material for a seal and the like, and operates when a worker's hand or the like enters a danger zone between two rolls. It relates to a safety device to be stopped. As a method of kneading two or more kinds of materials, a method of putting materials between two rolls arranged side by side is generally performed. Particularly, in the case of rubber materials, a method of kneading various materials such as a base rubber, a reinforcing material and a vulcanizing material with a roll has been widely adopted. As shown in FIG. 10, the roll kneading device 11 includes
The peripheral sides of the rolls 12, 12 of the books are brought close to each other, and the rolls 12, 12 are rotated so that the peripheral sides facing each other are directed downward. These rolls 12, 12 are arranged above a tray 24 on a gantry 13, and both ends of a rotary shaft are rotatably supported by side plates 15, 15 erected from both edges of the gantry 13. ing. And FIG.
As shown in FIG.
Each is rotationally driven by being connected to a motor 17 via a transmission 16. At this time, these rolls 1
In FIGS. 2 and 12, the side closer to the worker A shown in FIG. 10 rotates faster than the other. 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, two partition plates 19,
The rollers 19 are slidable in the axial direction of the rolls 19, and the sliding position can be fixed by the screws of the grips 20, respectively.

[0002] A worker A in a kneading operation puts a rubber material B mixed with raw materials from above the roll kneading apparatus 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.

The gap between the rolls 12 in the roll kneading device 11 is only about several mm even when the rubber material B is kneaded, and 1 mm when the rubber material B is finally formed into a thin sheet. It 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 apparatus 11, as shown in FIG. 10, a touch bar 31 is provided above the rolls 12 and a microphone 32 is arranged. The touch bar 31 is connected to a safety device that detects the operation of the touch bar 31 with a limit switch at the base and shuts off the power of the motor 17. Therefore, if the worker A gets his hand entangled between the rolls 12 and 12 and pushes or pulls the touch bar 31 with the other hand, the roll 1
The rotation of 2, 12 can be stopped urgently. Also,
The microphone 32 is connected to a safety device that detects the input of a loud voice and shuts off the power of the motor 17. Therefore, if the worker A puts his hand on the roll 12,
When the player screams between the rolls 12, the rotation of the rolls 12, 12 can be stopped urgently. In addition, instead of the touch bar 31, an emergency cord is stretched,
The motor 17 detects that the emergency cord has been pulled.
In some cases, a safety device that shuts off the power supply of the vehicle may be connected.

[0005]

However, the above-mentioned conventional safety device has a problem in that the worker A feels danger due to his / her hand being caught or actually operates the touch bar 31 or the like with his / her hand caught. When the worker A screams due to his or her hand being caught, the rolls 12 and 12 are stopped urgently. Therefore, prompt measures should be taken immediately before a serious accident occurs or immediately after the accident occurs. However, there is a problem that it is not possible to prevent the occurrence of an accident beforehand.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and detects an intrusion of a worker's hand into a peripheral area between rolls by a sensor and performs an emergency stop to prevent an accident from occurring. It is an object of the present invention to provide a safety device for a roll kneading device that can prevent such a problem.
In addition, the present invention is a safe when the roll is stopped,
An object of the present invention is to provide a safety device for a roll kneading device that can detect a failure of the photoelectric sensor by testing whether the photoelectric sensor can normally operate by receiving light of a specific property. I have.

[0007]

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

According to the first aspect of the present invention, the side peripheral surfaces of two rolls arranged side by side are brought close to each other,
In a roll kneading apparatus for kneading a rubber material by rotating these rolls so that opposing peripheral side faces both downward, a light projector for irradiating light to a peripheral area between at least two rolls, and a roll kneading apparatus A reflector for detection, which receives light from the projector and reflects only light of a specific property, and light of a specific property from a peripheral area between two rolls. A safety device comprising: a photoelectric sensor that receives only light, and emergency stop means for stopping operation of the roll kneading device when at least one photoelectric sensor receives light of a specific property by a predetermined amount or more, At an appropriate time while the rotation of the roller is stopped, the operation of the roll kneading apparatus is set not to be started, and each photoelectric sensor receives light of a specific property at least once or more for a predetermined time or more. Previously, characterized in that it does not release operation start restricting means for starting limit of the operation is provided.

According to the first aspect of the present invention, the operation start restricting means prevents the operation of the roll kneading apparatus from being started at a safe time when the rotation of the roll is stopped, for example, before starting work. Set. Then, the worker performs an inspection work such as holding the hand wearing the reflector for detection in front of the photoelectric sensor, and when each photoelectric sensor receives light of a specific property from the reflector for detection, the operation start restriction is performed. Since the means removes the operation start restriction, the operation of the roll kneading apparatus can be started. Therefore, if any of the photoelectric sensors cannot receive light of a specific property due to a failure, or if this photoelectric sensor is capable of receiving light but cannot detect the reception of light due to a failure in the detection circuit, Since the operation start restriction means does not release the operation start restriction, it is possible to avoid the danger caused by these failures.
In addition, since the inspection of the photoelectric sensor is performed with the actual reflector for detection, when the worker wears the wrong reflector, or the reflector for detection cannot reflect light of a specific property due to dirt or the like. In such a case, the operation can be prevented from being started.

Further, according to a second aspect of the present invention, the detecting reflector of the first aspect is provided on the entire outer peripheral surface of a wristband to be mounted on a wrist of an operator of the roll kneading apparatus, and the light projector is provided. And a wristband rotation support for fitting and rotating a wristband provided with the detection reflector, and being mounted on the wristband rotation support. A test projector that illuminates a part of the wristband detecting reflector with light, and a test that receives only light of a specific property from the area of the detecting reflector to which the test projector emits light At the appropriate time while the rotation of the roll is stopped, the operation of the roll kneading device is set to be not started, and the wristband rotating support is rotated at least one turn. If the test photoelectric sensor does not continuously receive a predetermined amount or more of light of a specific property over the entire period of rotation of the wristband rotating support, regardless of the state of the operation start restricting means, A second operation start restriction unit that does not release the start restriction is provided.

According to the second aspect of the present invention, if the wristband is mounted on the wristband rotating support in advance, for example, the reflector for detecting the wristband automatically before starting work. Can be inspected over the entire circumference, and if any part does not reflect light due to dirt or the like, the operation of the roll kneading apparatus can be prevented from starting. Therefore, the operator can operate the roll kneading apparatus after checking the safety of the detecting reflector, performing an inspection work such as wearing a wristband and holding the wristband over the photoelectric sensor.

Alternatively, the invention described in claim 3 is the invention according to claim 1.
The projector, or the projector and the test projector according to claim 2 irradiate only substantially linearly polarized light, and the detection reflector changes the polarization direction of the incident light and reflects the light. The photoelectric sensor according to claim 1 or the photoelectric sensor according to claim 2 and a test photoelectric sensor have a polarization direction when light from the light projector or the test light projector is reflected by the detection reflector or the test reflector. It is characterized by receiving only substantially linearly polarized light.

According to the sixth aspect of the present invention, when substantially linearly polarized light from the projector is reflected by a rubber material or a roll, the polarization direction does not change. Since the polarization direction changes when reflected by the detection reflector attached to the worker's hand, etc.,
Light can be received by the photoelectric sensor. Therefore, the safety device can reliably detect the hand or the like of the worker who has entered the surrounding dangerous area between the two rolls by distinguishing the hand or the like from the rubber material or the roll.

[0019]

Next, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a safety device for a roll kneading apparatus according to the present invention. Components having the same functions as those of the conventional example shown in FIGS. 10 and 11 are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a block diagram of a safety device of a roll kneading apparatus, and FIG. 2 is a partial cross section for explaining the structure of a photoelectric sensor. FIG. 3 is a perspective view, and FIG. 3 is a plan view showing a reflector sewn to gloves. Components having the same functions as those of the conventional example shown in FIGS. 10 and 11 and the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, as shown in FIG. 1, a case will be described in which a plurality of light emitters 5a and a plurality of photoelectric sensors 5b housed in a sensor case 5 are used. As shown in FIG. 2, the photoelectric sensor 5b accommodated in the case 5 is of a reflection type which reflects and receives the light emitted by the light projector 5a, and directs the light projector 5a and the photoelectric sensor 5b downward. The roll kneading device 11 is disposed above the space between the rolls 12. Further, the photoelectric sensor 5b limits its directional characteristics to a peripheral area between the rolls 12, 12, and
a also irradiates light to a region including this directivity range. When the directional range of one set of the projector 5a and the photoelectric sensor 5b is a circle D as shown in FIG.
A set of a plurality of light projectors 5a and photoelectric sensors 5b is arranged along the axial direction of the roll 12.

As shown in FIG. 2, in the case 5, a polarizing plate 5c that transmits only linearly polarized light in the X direction is disposed in front of the projector 5a, and in the X direction in front of the photoelectric sensor 5b. A polarizing plate 5d that transmits only linearly polarized light in the Y direction perpendicular to the direction is disposed. Therefore, when the light emitted from the light projector 5a via the X-direction polarizing plate 5c is reflected by an ordinary object and returns, the polarization direction remains in the X direction, and the Y-direction polarizing plate is used. 5d, and cannot be received by the photoelectric sensor 5b. The polarizing plates 5c and 5d
As long as it has the same function, other polarizers can be used.

The photoelectric sensor 5b housed in the case 5
3, the worker A needs to carry out the work by wearing gloves 7 in which the detecting reflector 6 is sewn to the back of the hand as shown in FIG. The detecting reflector 6 has a large number of minute concave reflecting surfaces disposed on the surface thereof, and a 波長 wavelength plate disposed on the upper surface of these reflecting surfaces. When the reflecting surface has an inverted conical shape with an apex angle of 90 °, the incident light is efficiently reflected and returned in the incident direction, and even in the case of a curved concave shape, a part of the incident light is surely reflected in the incident direction. Irrespective of the direction of the detecting reflector 6, the light projector 5a
, The light can be reflected and returned to the photoelectric sensor 5b without fail. When the quarter-wave plate transmits the linearly polarized incident light, reflects it on the reflection surface on the back surface, and transmits the linearly polarized light again, the linearly polarized light whose polarization direction is rotated by 90 ° is emitted. When the linearly polarized light in the X direction is irradiated, the linearly polarized light in the Y direction is returned to the photoelectric sensor 5b. Then, the light whose polarization direction is the Y direction can be transmitted through the polarizing plate 5d and is received by the photoelectric sensor 5b. The reflecting surface may be a minute convex or a flat surface that scatters reflected light instead of a minute concave. Further, other optical elements can also be used for the 波長 wavelength plate as long as they have the same function. Further, another optical material having the function of the reflecting surface and the function of the quarter-wave plate can be used.

The amount of light received by the photoelectric sensor 5b accommodated in the case 5 is sent to the judgment circuit 3 as needed. The determination circuit 3 determines whether the value of the received light amount exceeds a predetermined value, and sends a control signal corresponding to the determination result to the driving unit 11a of the roll kneading device 11.
That is, when it is determined that the amount of received light exceeds a predetermined value, a control signal for instructing the operation of the roll kneading device 11 to be stopped is sent to the driving unit 11a, and when it is determined that the amount of received light does not exceed the predetermined value, control for instructing continuation of operation is performed. Send a signal. The drive unit 11a continues the operation of the roll kneading apparatus 11 as it is when a control signal for instructing continuation of operation is sent. The operation is stopped by urgently stopping the rotation of the motor.

With the above configuration, the ordinary roll kneading apparatus 1
During the kneading operation (1), the linearly polarized light of the X direction emitted from the projector 5a accommodated in the case 5 is only reflected by the rolls 12, 12 and the rubber material B. Light cannot pass through the polarizing plate 5d whose polarization direction is the Y direction, but only light having the polarization direction of the Y direction happens to be transmitted among the reflected light due to the external light, and the amount of light received by the photoelectric sensor 5b is also small. It will be slight. However, worker A
When the hand inadvertently enters the area between the rolls 12 and 12 due to carelessness, the light from the light projector 5a is reflected by the detection reflector 6 of the glove 7 attached to the hand of the worker A, and the polarization direction Is changed to the Y direction and is surely returned to the photoelectric sensor 5b side, so that the reflected light passes through the polarizing plate 5d and increases the amount of light received by the photoelectric sensor 5b. Then, the determination circuit 3 sends a control signal for instructing to stop the operation to the drive unit 11a due to the increase in the amount of received light, and the drive unit 11a immediately stops the rolls 12, 12 immediately. Therefore, worker A
The operation of the roll kneading apparatus 11 can be reliably stopped before the hand is caught in the rotation of the rolls 12, 12, and an accident can be prevented from occurring.

When the case 5 accommodating the projector 5a and the photoelectric sensor 5b is disposed above the partition plate moving bar 18 shown in FIG. When adjusting the interval between the partition plates 19, 19 by loosening, a hand enters into the directivity range of the photoelectric sensor 5b. However, at this time, the hand of the worker A holds the rolls 12, 1
There is no danger as it is well above the distance between the two. Therefore, in this case, the photoelectric sensor 5b housed in the case 5
Unnecessary stoppage can be avoided by using one having a characteristic that has a dead zone that cannot receive light. Further, in the first embodiment, the reflector 6 is sewn to the glove 7, but may be directly attached to the wrist in a wristband-like manner, or the hand or the finger of the worker A by any other method. , Can be worn on the tip of the wrist or arm.

Further, in the first embodiment, the reflected light from the rolls 12 and 12 and the rubber material B and the reflected light from the reflector 6 attached to the hand of the worker A are utilized by utilizing the polarization of the light. As identified, the photoelectric sensor 5b is constituted by a light receiver that receives only light of a color such as yellow or green which is hardly contained in the wavelength components of the reflected light from the rolls 12 and the rubber material B, Similarly, when the detecting reflector 6 is formed of a reflective tape or the like that reflects only the same light of yellow or green, or when the glove 7 itself is used as the reflector 6 in the color tone of yellow or green, the roll 12 is similarly formed. , 12 and the rubber material B and the reflected light from the detecting reflector 6 can be distinguished. In this case, as the photoelectric sensor 5b, a sensor having sensitivity only to light in a specific wavelength region may be used, or a filter that transmits only light in a specific wavelength region may be arranged before a normal light receiver. Is also good.

In some cases, the determination circuit 3 issues a control signal for stopping the operation based only on the physical quantity detected by the capacitance sensor or the heat ray sensor in addition to the photoelectric sensor 5b as a sensor. In combination with another arranged sensor, a control signal for stopping operation can be issued only when these detection results satisfy predetermined conditions.

In the first embodiment, the photoelectric sensor 5b operates the safety device by receiving light of a specific polarization direction or light of a specific color. Even if the sensor 5b cannot receive light, it cannot be distinguished from a state in which light is not received in a normal state. That is, in the safety device of the type in which the photoelectric sensor 5b detects an abnormality by receiving light, the failure occurs when the photoelectric sensor performs the same output as that when the photoelectric sensor does not receive the light at the time of light reception due to a failure. Then, a fail-safe configuration that operates on the safe side cannot be adopted. In addition, the peripheral danger area between the rolls 12, 12 is usually a long and narrow area along the axial direction of the roll 12, and a large number (for example, 16) of photoelectric sensors are arranged side by side along this area and directed. Since the ranges are often overlapped, even if only one of the photoelectric sensors breaks down, the abnormality cannot often be found immediately.

For this reason, the worker A may start the work without knowing that the photoelectric sensor 5b has failed, and the rotation of the rolls 12, 12 does not stop even if a hand enters the danger area. In some cases, accidents cannot be prevented beforehand. Therefore, in the safety device for the roll kneading apparatus of the present invention, this problem was solved by the following second and third embodiments.

FIGS. 5 and 6 show a second embodiment of the present invention. FIG. 5 is a block diagram of a safety device of a roll kneading apparatus, and FIG. 6 is a roll showing the directivity range of a photoelectric sensor. It is a top view of a kneading device.

In the safety device of the roll kneading apparatus according to the second embodiment, a case will be described in which a photoelectric sensor that detects the intrusion of a worker's hand into a dangerous area by using the polarization of light is used. As shown in FIG. 5, the floodlight 5a of this safety device
The photoelectric sensor 5b is housed in the case 5 and disposed above the roll kneading device 11 between the rolls 12, 12. In the case 5, as shown in FIG.
And the photoelectric sensor 5b are arranged as a pair and directed downward. The photoelectric sensor 5b is, as shown in FIG.
There is a circular directional range D as indicated by hatching in a peripheral area between the areas 2 and 12 (similar to FIG. 4). By arranging a plurality of photoelectric sensors 5b at appropriate intervals in the case 5, the circular directional ranges D partially overlap with each other so as to cover the elongated area around the rolls 12, 12. It has become. In addition, each photoelectric sensor 5b
The light projectors 5a that are paired with each other also irradiate light to the area including the directivity range D, and a plurality of light projectors 5a are arranged in the case 5 at appropriate intervals similarly to the photoelectric sensor 5b. FIG. 6 shows a case where five photoelectric sensors 5b are arranged. However, in actuality, the dangerous area around the rolls 12, 12 has a sufficiently large axial length compared to the width, so Many (for example, 16) photoelectric sensors 5b are arranged. However, if the directivity range D of one photoelectric sensor 5b covers the entire area around the rolls 12 and 12 as it is, it may be sufficient to provide only one photoelectric sensor 5b. obtain.

In this second embodiment as well, as shown in FIG. 2, a polarizing plate 5c that transmits only linearly polarized light in the X direction is arranged on the front surface of the light projector 5a. A polarizing plate 5d that transmits only linearly polarized light in the Y direction orthogonal to the X direction is disposed on the front surface. Therefore, when the light emitted from the light projector 5a via the X-direction polarizing plate 5c is reflected by an ordinary object and returns, the polarization direction remains in the X direction, and the Y-direction polarizing plate is used. 5d, and cannot be received by the photoelectric sensor 5b. As the polarizing plates 5c and 5d, other polarizers can be used as long as they have the same function.

As shown in FIG. 2, the case 5 accommodating the light projector 5a and the photoelectric sensor 5b is attached to a rotary solenoid 8 so that the case 5 can be rotated by 90 ° around a rotation axis parallel to the roll 12. It has become. A long plate-shaped test reflector 9 is disposed substantially along the case 5 on the side on which the case 5 rotates. The test reflector 9 has a mirror-facing reflection surface on the side facing the case 5 and a quarter of the front surface of the reflection surface.
The wave plate is arranged. The 波長 wavelength plate emits linearly polarized light whose polarization direction is rotated by 90 ° when the incident linearly polarized light is transmitted, reflected by the reflection surface on the back surface, and transmitted again. Therefore, this test reflector 9 is
When the case 5 is rotated and linearly polarized light having a polarization direction of X direction is emitted from the light projector 5a, linearly polarized light having a polarization direction of Y direction is returned to the photoelectric sensor 5b.

In the safety device of this embodiment, too, as shown in FIG. 3, the worker A wears the glove 7 in which the detecting reflector 6 is sewn to the back of the hand to perform the work. The reflection surface of the test reflector 9 may be the same as the reflection surface of the detection reflector 6. Further, these reflecting surfaces may be minute convex shapes, flat surfaces that scatter reflected light, or the like, instead of minute concave shapes. Further, as the quarter-wave plate of the test reflector 9 and the detection reflector 6, other optical elements can be used as long as they have the same function. Further, another optical material having the function of the reflecting surface and the function of the quarter-wave plate can be used.

As shown in FIG. 5, each of the above photoelectric sensors 5b
The signal of the received light amount output from the
To be sent to The emergency stop circuit 10 starts the roll kneading apparatus 1 when the amount of received light of the signal sent from at least one of the photoelectric sensors 5b exceeds a predetermined value.
It sends an operation stop signal to the first drive unit 11a. When the operation stop signal is sent from the emergency stop circuit 10, the drive unit 11a stops the operation by urgently stopping the rotation of the rolls 12, 12.

The signal of the amount of received light output from each of the photoelectric sensors 5b is sent to the test circuit 21 as needed. In addition, the driving unit 11a sends a roll stop signal to the light receiving target switching circuit 22 before the start or during a period in which the rotation of the rolls 12, 12 is stopped due to, for example, the worker A stopping the driving operation. I have. Light receiving target switching circuit 22
Drives the rotary solenoid 8 only during the period in which the roll stop signal is sent to the projector 5a and the photoelectric sensor 5b.
Is rotated by 90 ° and an operable signal is sent to the test circuit 21. The test circuit 21 controls each photoelectric sensor 5b only during the period when the operable signal is sent.
This is a circuit that checks whether the amount of received light of the signal sent from the device exceeds a predetermined value, and issues a warning if any one of the photoelectric sensors 5b does not exceed the predetermined value. The warning may be performed by any means as long as the worker A or the like can know the failure of the photoelectric sensor 5b. Usually, lighting of a lamp, buzzer sound, or the like is used. Alternatively, a lamp that always emits green light may be assigned to each photoelectric sensor 5b, and when the test circuit 21 detects a failure, the lamp corresponding to the photoelectric sensor 5b may be switched to red light. Further, at the same time as issuing a warning, the test circuit 21 sends a drive stop signal (not shown) to the drive unit 11a, and even if the worker A performs a drive operation, the roll 12, 12
It is preferred that 12 cannot be rotated.

With the above configuration, the ordinary roll kneading apparatus 1
During the kneading operation 1, the linearly polarized light in the X direction emitted from the light projector 5a is only reflected by the rolls 12, 12 and the rubber material B, so that the reflected light is reflected by the polarizing plate 5d in the Y direction.
Cannot be transmitted, and is not received by the photoelectric sensor 5b. In this case, the light having the polarization direction of the Y direction among the light reflected by the external light happens to be transmitted through the polarizing plate 5d, but the amount of light received by the photoelectric sensor 5b is very small. No effect. However, when the hand of the worker A inadvertently enters the danger area around the rolls 12, the light from the projector 5 a causes the detection reflector 6 of the glove 7 attached to the hand of the worker A to be detected. Reflected by
Since the polarization direction can be changed to the Y direction and is surely returned to the photoelectric sensor 5b side, the reflected light passes through the polarizing plate 5d and increases the amount of light received by the photoelectric sensor 5b. Then, the emergency stop circuit 10 sends a control signal for instructing to stop the operation to the drive unit 11a due to the increase in the amount of received light, and immediately stops the rolls 12, 12 immediately. Therefore, before the hand of the worker A is involved in the rotation of the rolls 12, 12, the operation of the roll kneading apparatus 11 can be stopped reliably, and occurrence of an accident can be prevented.

Also, before the start of the roll kneading apparatus 11 or during the operation, if the worker A stops the driving operation, the rolls 12 and 12 stop rotating. There is no danger if A's hand enters the peripheral area between the rolls 12,12. During the period when the rotation of the rolls 12 and 12 is stopped, the light receiving target switching circuit 22 drives the rotary solenoid 8 to rotate the case 5 housing the light emitter 5a and the photoelectric sensor 5b by 90 °. Then, the test circuit 21 checks whether the amount of received light of the signal sent from each photoelectric sensor 5b exceeds a predetermined value. Then, the light from the light projector 5a is reflected by the test reflector 9, and the reflected light changes its polarization direction to Y.
The light is transmitted through the polarizing plate 5d by changing the direction. For this reason, if the photoelectric sensor 5b is normal, the amount of received light increases. Therefore, the test circuit 21 detects that the amount of received light of the photoelectric sensor 5b exceeds a predetermined value. However, even one photoelectric sensor 5b
If a failure occurs or the detection circuit of the photoelectric sensor 5b is abnormal, the test circuit 21 detects that the amount of light received by the photoelectric sensor 5b does not exceed a predetermined value, and issues a warning. Therefore, since the worker A can know the failure of the photoelectric sensor 5b and the like by this warning, there is no danger that the worker A starts work without knowing the failure of the safety device and an accident occurs.

In this embodiment, before starting work or when the worker A
Did the inspection of each photoelectric sensor 5b when the driving operation was stopped. However, it is not necessary to perform this inspection every time the rolls 12 and 12 stop rotating. For example, this inspection is performed only before the start of work. May be performed.

In this embodiment, the case 5 is rotated by the rotary solenoid 8. However, the case 5 may be rotated by another driving device or manually. Further, in the present embodiment, the projector 5a and the photoelectric sensor 5b are directed toward the test reflector 9 by rotating the case 5, but the optical path of the projector 5a and the photoelectric sensor 5b is changed by a mirror or the like to the test reflector. The light may be reflected to the side 9, or the test reflector 9 itself may be moved and disposed between the light projector 5 a or the photoelectric sensor 5 b and the rolls 12. Further, in the present embodiment, a plurality of sets of the light emitters 5a and the photoelectric sensors 5b are arranged in pairs, but one or more light emitters 5a are connected to the photoelectric sensors 5b.
And can be arranged separately and independently.

FIGS. 7 and 8 show a third embodiment of the present invention. FIG. 7 is a block diagram of a safety device for a roll kneading apparatus, and FIG. 8 is a block diagram showing a configuration of an operation start restriction circuit. It is. Components having the same functions as those of the second embodiment shown in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof will be omitted.

The safety device of the roll kneading apparatus of this embodiment has substantially the same configuration as that shown in the second embodiment. However, in this embodiment, the test reflector 9 and the rotary solenoid 8 shown in the second embodiment are not provided, and the light receiving target switching circuit 22 is not used. Therefore, the case 5 does not rotate, and the projector 5a and the photoelectric sensor 5b always keep the roll 1
It faces the danger zone around 2 and 12. Also, the fourth
Instead of the test circuit 21 shown in the embodiment, the driving unit 1
An operation start restriction circuit 14 for sending an operation stop signal to 1a is provided.

The operation start restriction circuit 14 is provided for each photoelectric sensor 5
The signal of the amount of received light output from b is input. In the initial state after the power is turned on, the driving unit 1
1a, a continuous operation stop signal is sent to all photoelectric sensors 5a.
If the light receiving amount of b exceeds the predetermined value even once, the transmission of the operation stop signal to the drive unit 11a is stopped thereafter.

The operation start limiting circuit 1 for performing such an operation
FIG. 8 shows a configuration example of No. 4. The signal of the amount of light received from each photoelectric sensor 5b is input to the set terminal of the RS flip-flop circuit 14b via the comparison circuit 14a. Each comparison circuit 14a is a binarization circuit that outputs a signal that goes high when the voltage value indicating the amount of received light of the signal from the corresponding photoelectric sensor 5b exceeds a predetermined reference voltage Vref. Further, a reset signal which goes high only once after the power is turned on is input to the reset terminal of each RS flip-flop circuit 14b. The output Q of each RS flip-flop circuit 14b.
Is input to Therefore, after the power is turned on, all the RS flip-flop circuits 14b are reset by the reset signal, and the output Q becomes L level. Therefore, the H level output from the NAND circuit 14c is sent to the drive unit 11a as the operation stop signal. Will be done. Further, if the amount of light received by each photoelectric sensor 5b exceeds a predetermined value even once, the corresponding RS flip-flop circuit 14b is set and the output Q thereafter keeps the H level. When 14b ... is set, NAN
The output of the D circuit 14c switches to the L level, and the operation stop signal is not sent.

Each RS flip-flop circuit 14b
A lamp can be provided for each lamp, and when the corresponding RS flip-flop circuit 14b is reset, these lamps are turned on in red, and when set, these lamps can be switched to green light. .

With the above configuration, immediately after turning on the power to the roll kneading apparatus 11, the operation start limiting circuit 14 continues to send an operation stop signal to the drive unit 11a, so that the operator A can operate even if the operation is performed. Can't start. However, when the worker A holds the hand wearing the glove 7 over the case 5 containing the light emitter 5a and the photoelectric sensor 5b and performs an inspection operation in which the worker A moves in order along the case 5, each photoelectric sensor 5b The linearly polarized reflected light in the Y direction from the detecting reflector 6 is sequentially received. When the light receiving amounts of all the photoelectric sensors 5b exceed a predetermined value, the operation start restriction circuit 1
4 stops the output of the operation stop signal. Then, the roll kneading apparatus 11 can start operating when the worker A performs an operating operation. When lamps are provided in the operation start restriction circuit 14, all the lamps light red immediately after the power is turned on, and when the worker A holds his hand below the photoelectric sensor 5b, the photoelectric sensor 5b The corresponding lamps are sequentially switched to green lighting, and all the lamps are lit green to indicate that the driving operation is enabled. The inspection work by the worker A is executed, for example, at the start of inspection every morning.

Therefore, if at least one of the photoelectric sensors 5b has a failure or the detection circuit of the photoelectric sensor 5b has an abnormality, the worker A is placed below the photoelectric sensor 5b.
Since the received light amount does not exceed the predetermined value even if the hand is held, the operation start restriction circuit 14 continues to output the operation stop signal. When a lamp is provided in the operation start restriction circuit 14,
Only the lamp corresponding to the failed photoelectric sensor 5b remains lit in red. For this reason, there is no possibility that the worker A starts the work without knowing the failure of the safety device and causes an accident. Also, unlike the case of the second embodiment, since the inspection of the photoelectric sensor 5b is actually performed by using the detection reflector 6 of the glove 7 worn by the worker A on the hand, the worker A uses the wrong glove. When the sensor is mounted, or when the detecting reflector 6 cannot reflect light due to dirt or the like, it is possible to detect this in advance and prevent the operation from starting. Further, since a movable portion such as the rotating case 5 in the case of the second embodiment is not required, the safety device can be configured at a low cost.

In the present embodiment, the inspection of each photoelectric sensor 5b is performed only before the start of work. However, this inspection may be performed at any time during the period when the rolls 12 and 12 stop rotating.

In the second and third embodiments, the reflected light from the rolls 12 and the rubber material B and the detection reflector 6 attached to the hand of the worker A are utilized by utilizing the polarization of the light. However, the photoelectric sensor 5b receives only light of a color such as yellow or green which is hardly included in the wavelength component of the reflected light from the rolls 12 and 12 or the rubber material B. It may be configured. In this case, the test reflector 9 and the detection reflector 6 of the second embodiment and the detection reflector 6 of the fifth embodiment are formed of a reflective tape or the like that reflects only the same yellow or green light. I do. Further, the photoelectric sensor 5b may use a light receiving element having sensitivity only to light in a specific wavelength region, or arrange a filter that transmits only light in a specific wavelength region in front of a normal light receiving element. Is also good.

In the second and third embodiments, the detection reflector 6 is sewn to the glove 7, but the glove 7 itself may be formed by the detection reflector 6, or the detection reflector 6 may be sewn. May be worn directly on the wrist in the form of a wristband, or may be worn on the hand, finger, wrist or arm of the worker A by any other method.

By the way, in the third embodiment of the present invention, when the detecting reflector 6 is provided on the entire circumference of the outer peripheral surface of the wristband and is attached to the wrist of the worker A, the detecting reflector 6 Even if only a part of the entire circumference is dirty and cannot reflect light, when the worker A holds his hand toward the photoelectric sensor 5b with the clean side of the detection reflector 6, the operation starts. There is a danger that the limiting circuit 14 stops outputting the operation stop signal and the operation of the roll kneading apparatus 11 can be started.

Therefore, as shown in FIG. 9, for example, an inspection device for inspecting the detection reflector 6 provided on the wristband 25 for dirt or the like can be provided. This inspection apparatus includes a pair of cylindrical supports 26, 26 on which the wristband 25 is fitted and mounted on the outer periphery. These supports 2
The small motors 6 and 26 are driven to rotate by small motors 27 and 27. Further, below the supports 26, 26, test photoelectric detectors 28, 28 having the same configuration as the one set of the light projector 5a, the polarizing plate 5c, the photoelectric sensor 5b, and the deflecting plate 5d are arranged. Photoelectric detector 2 for each test
8 and 28, the test projectors are the supporting members 2 on the other side.
X is applied to the detecting reflector 6 of the wristband 25 attached to
The test photoelectric sensor receives only linearly polarized light reflected in the Y direction from only a partial area of the detection reflector 6. A control circuit (not shown) is, for example, a roll kneading device 11.
When the power is turned on, the small motors 27, 27 are rotated one or more times, so that the amount of light received by the test photoelectric detectors 28, 28 becomes a predetermined value within the time that the supports 26, 26 are rotating. If the time period does not exceed even once, the operation start limiting circuit 14 is prevented from stopping the output of the operation stop signal.

Therefore, if the worker A has previously mounted the pair of wristbands 25, 25 on the supports 26, 26,
Inspection of the detecting reflectors 6, 6 of these wristbands 25, 25 can be performed simultaneously with turning on the power. And
If there is a portion that does not reflect light even in a part of the entire circumference of the detecting reflector 6 due to dirt or the like, a period occurs in which the amount of light received by the test photoelectric detector 28 does not exceed a predetermined value. However, the output of the operation stop signal is not stopped after that, and the danger that the safety device does not work by the worker A using the dirty detection reflector 6 can be avoided in advance. When the detection reflector 6 is clean, the light reception amount of the test photoelectric detector 28 continues to exceed a predetermined value during the rotation period of the supports 26, 26. Perform the following actions. Therefore, the worker A removes the wristbands 25, 25 from the supports 26, 26, attaches them to both wrists, and holds the wristbands 25, 25 toward the photoelectric sensor 5b, so that the operation stop signal of the operation start restriction circuit 14 is generated. When the output is stopped, the operation of the roll kneading apparatus 11 can be started.

[0054]

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. In particular, before the start of work or whenever the roll during work stops rotating, an abnormality such as a failure of the photoelectric sensor can be automatically detected, or the abnormality can be detected by an operation of the worker. It is possible to prevent the occurrence of an accident by starting work without knowing the failure or the contamination of the detection reflector.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a safety device for a roll kneading apparatus of the present invention.

FIG. 2 is a partial cross-sectional perspective view for explaining a structure of a light projector and a photoelectric sensor part in the first embodiment of the safety device for the roll kneading apparatus of the present invention.

FIG. 3 is a plan view showing a reflector sewn on gloves in the first embodiment of the safety device for the roll kneading apparatus of the present invention.

FIG. 4 is a plan view of a roll kneading apparatus for indicating a directivity range of the photoelectric sensor according to the first embodiment of the roll kneading apparatus safety device of the present invention.

FIG. 5 is a block diagram showing a second embodiment of the safety device for the roll kneading apparatus of the present invention.

FIG. 6 is a plan view of a roll kneading device for indicating a directivity range of a photoelectric sensor in a second embodiment of the safety device for a roll kneading device of the present invention.

FIG. 7 is a block diagram showing a third embodiment of a safety device for a roll kneading apparatus according to the present invention.

FIG. 8 is a block diagram showing a configuration of an operation start restriction circuit in a third embodiment of the safety device for a roll kneading apparatus of the present invention.

FIG. 9 is a perspective view of an inspection device for inspecting a wristband for dirt or the like when a wristband is used in the third embodiment of the safety device for a roll kneading device of the present invention.

FIG. 10 is a longitudinal sectional side view for explaining the structure of a conventional roll kneading apparatus.

FIG. 11 is a plan view of a conventional roll kneading apparatus.

[Explanation of symbols]

 3 Judgment Circuit 5 Case 5a Projector 5b Photoelectric Sensor 5c Polarizer 5d Polarizer 6 Reflector for Detection 7 Glove 8 Rotary Solenoid 9 Reflector for Test 10 Emergency Stop Circuit 11 Roll Kneading Device 11a Driving Unit 12 Roll 13 Mount 14 Operation Start restriction circuit 15 Side plate 16 Transmission device 17 Motor 18 Bar for moving partition plate 19 Partition plate 20 Grip 21 Test circuit 22 Light receiving target switching circuit 25 Wrist band 26 Support 27 Small motor 28 Photoelectric detector for test

──────────────────────────────────────────────────続 き Continuation of the front page (72) Katsuya Okamoto, Inventor 663 Minoshima, Arita City, Wakayama Prefecture Mitsubishi Cable Industry Co., Ltd. Mishima Works (56) References JP-A-59-12742 (JP, A) JP-A-4- 104420 (JP, A) JP-A-48-81412 (JP, A) JP-A-61-77783 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G05B 9/02 B01F 13 / 04 B29B 7/56 B29B 7/58

Claims (3)

(57) [Claims] 1. A roll kneading device for kneading a rubber material by bringing side circumferential surfaces of two rolls arranged side by side close to each other and rotating these rolls so that both facing circumferential surfaces face downward. A projector for irradiating a light to a peripheral area between two rolls, and a hand of an operator of the roll kneading apparatus,
A detecting reflector that receives light from the projector and reflects only light of a specific property; a photoelectric sensor that receives only light of a specific property from a peripheral area between the two rolls; and at least one photoelectric sensor Is a safety device having emergency stop means for stopping the operation of the roll kneading device when light of a specific property is received by a predetermined amount or more, at an appropriate time while the rotation of the roll is stopped, An operation start restricting means is provided for setting the state in which the operation of the roll kneading apparatus is not started and not canceling the operation start restriction until each photoelectric sensor receives light of a specific property at least once or more for a predetermined time or more. A safety device for a roll kneading device. 2. The detecting reflector is provided all around the outer peripheral surface of a wristband to be worn on a wrist of an operator of the roll kneading apparatus, and receives only light of a specific property by receiving light from a projector. A wristband rotation support for fitting and rotating the wristband provided with the detection reflector, and a part of the wristband detection reflector mounted on the wristband rotation support. A test floodlight that illuminates the area, a test photoelectric sensor that receives only light of a specific property from the area of the detection reflector that the test floodlight illuminates, and a roll that stops rotating At an appropriate time during the operation, the operation of the roll kneading apparatus is set not to be started, and the wristband rotating support is rotated at least one or more times. If the test photoelectric sensor does not continuously receive a predetermined amount or more of light of a specific property over the entire period, regardless of the state of the operation start restricting means, the second operation start which does not release the operation start restriction is performed. The safety device for a roll kneading device according to claim 1, wherein a limiting means is provided. 3. The projector according to claim 1 or the projector according to claim 2 and the test projector emit only substantially linearly polarized light, and the detecting reflector adjusts the polarization direction of the incident light. The photoelectric sensor according to claim 1 or the photoelectric sensor according to claim 2 and a test photoelectric sensor reflect light from a light projector or a test light projector with a detection reflector or a test reflector. The safety device for a roll kneading device according to claim 1 or 2, wherein the safety device receives only substantially linearly polarized light having a polarization direction when the light is polarized.