JP2005321084A - Body protection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a sensor provided on a machinery side has difficulties to identify all situations of the operators or workers even though a general method is to safely protect the operators and workers from being caught in the machinery so as to stop the machinery when sensing that a part of a personal body enters into a movement zone of tools or movable sections by arranging the sensor at the machinery side in order, and to surely detect any abnormality affecting operators or workers of machinery so that accidents resulting in injury or death caused by the machinery can be minimized. <P>SOLUTION: Upon mounting the pressure sensor on a part of a personal body possibly bringing into contact with the movable sections of the machinery, when the operators and workers of the machinery are caught with the machinery, it is directly and momentarily detected as electric signals, and operation of the machinery is stopped in emergency so as to protect fatal injuries of the operators and workers of the machinery. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a body protection method for preventing a fatal injury caused by a driver or an operator being caught or caught in a movable part of a mechanical device.

  During the work of an industrial machine or the like, an accident may occur in which a driver or a worker is caught in a mechanical device, or is caught and killed. In the case of a machine tool, an arm or the like may come into contact with a blade or a moving part, and a large injury may occur. There may be a burden. In addition, an arm may be caught in a movable part of a garbage input port of a garbage collection vehicle or the like, resulting in a life-related injury.

  In order to prevent the occurrence of these accidents, many methods or devices for protecting the body of a driver or an operator have been proposed. A general method is to detect that a body part has entered the moving area and stop the mechanical device.

  A garbage collection vehicle will be described as an example. The garbage truck consists of a waste container box that finally stores garbage and a waste container box that throws in the garbage. A loading device is provided. The loading device is provided with a rotating plate, and the dust introduced from the garbage inlet is compressed by the rotating plate, sent to the garbage collection box by the loading device, and stored.

  When some sort of abnormality occurs in the rotating body of the garbage truck, the operator can press the emergency stop button installed near the garbage collection port of the garbage truck or kick the foot switch. Stop. There is also provided means for an emergency stop operation by a person other than the worker who is performing the operation of throwing in the garbage. However, when an operator is caught in a rotating body, it is often difficult to respond instantaneously, and a personal accident cannot be avoided.

  Therefore, as a loading safety device for garbage collection vehicles, a light emitter is provided on one wall side of the input port of the garbage input box, a light receiver is provided on the other wall side, and an operator's hand is inserted into the input port. In this case, a method has been proposed in which the operation of the loading device is stopped by blocking the light projected from the light emitter, thereby preventing an accident in which an operator's hand is involved in the loading device.

  In the above safety device, multiple sets of light emitters and light receivers are arranged to determine the difference between garbage and workers' hands, etc., but it is difficult to determine the perfect discrimination between garbage and workers. There was a problem in terms of reliability. Further, even if a plurality of sets of light emitters and light receivers are arranged, if an operator's hand scratches the light beams, an accident will occur. In addition, depending on the shape of the garbage, it may be judged as an apologize for the operator's hand, and the loading device is frequently stopped, which may interfere with the garbage collection work.

  In addition, methods have been proposed to distinguish workers 'hands and garbage using infrared sensors, etc., but when garbage is hot outside, it is possible to distinguish between garbage and workers' hands. It is difficult.

  In addition, when the operator's hand is behind the thrown-in garbage as seen from the infrared sensor, it cannot be detected, which may lead to an accident.

  In addition, there is a method to detect anomalies using torque detection means provided on the machine side, but because the output on the machine side is large, it detects subtle changes such as pressure changes caused by touching the driver or operator. Is difficult.

  Other mechanical devices other than garbage trucks are also equipped with safety protection devices based on human body detection using photoelectric sensors and devices for emergency stop of the machine operation. In this case, there is no protection device that senses that an accident has occurred and minimizes human injury.

Problems to be solved by the invention

  A conventional safety device attached to a mechanical device is generally a method in which a detection sensor is provided on the mechanical device side to detect that a part of the body has entered the moving region of the blade or movable part, and to stop the mechanical device. It is.

  However, with this method, as seen in the example of the garbage truck, it is impossible to detect all the situations of the driver or the worker with the sensor provided on the machine side. Also, it is difficult to say that an abnormality detection means such as a torque detection means provided on the machine side is effective.

  In addition to accidents that occur when a garbage truck is thrown in, if it is caught on a rotating belt conveyor, if a hand-held hose is caught in a dehydrator, if it is sandwiched between an automated transport vehicle and a wall, a forklift There are many cases of accidents such as being caught in a crane or crane.

  In view of the above problems, an object of the present invention is to provide a body protection method for reliably detecting an abnormality that affects a driver or an operator of a mechanical device, and to prevent a personal injury related to the mechanical device to a minimum.

Means for solving the problem

  According to the body protection method of the present invention, a pressure sensor is attached to a body part that may come into contact with a movable part of a mechanical device, and the mechanical device generates an emergency stop signal based on a signal detected by the pressure sensor. Features.

  A conventional body protection method provided in a mechanical device detects that a part of the worker's body has entered a dangerous area by a detection sensor installed in the mechanical device, and stops the machine. Whereas measures are generally taken, the body protection method of the present invention has a shape in which a sensor for detecting abnormal pressure is incorporated into clothes or attachments worn by a machine operator or operator. In addition, it is possible to reliably detect that the operator or the operator of the mechanical device is caught or caught in the mechanical device. As a result, a fatal accident can be prevented by minimizing personal injury to the operator or operator of the mechanical device.

  The pressure sensor used in the body protecting method of the present invention is characterized in that it is incorporated in clothes or attachments of an operator who may come into contact with a movable part of a mechanical device.

  A dangerous state can be reliably detected by incorporating a pressure sensor for detecting an abnormal contact with the mechanical device into an operator's clothes or a wearing part.

  Further, the pressure sensor is formed into a sheet shape, a foil shape, or a strap shape. That is, it is preferable to be thin so as to be incorporated into the clothes of the worker.

  Further, the pressure sensor formed in a sheet shape, a foil shape, or a strap shape has a structure in which an aluminum nitride thin film layer and an electrode layer are laminated.

  The pressure sensor signal is sent to the mechanical device by wireless communication means.

  Furthermore, the mechanical device is immediately stopped by the emergency stop signal.

  Further, the mechanical device is characterized in that the electromagnetic valve or the like is cut by the emergency stop signal, and the drive system such as the hydraulic pressure or the air cylinder is released after the fall protection measure such as the slider so that the human body is hardly damaged.

  Next, embodiments of the present invention will be described in detail. FIG. 1 is a block diagram showing the constitution of the body protection stem of the present invention. FIG. 2 shows a part of the pressure detection part of the body protection sensor in which a pressure sensor formed in a fiber shape or a strip shape is woven, and FIG. 3 shows that the cloth and the pressure sensor are integrally formed by a method such as adhesion. A pressure detection unit is shown.

  As shown in FIG. 1, the body protection system of the present invention consists of two parts. One is a body protection sensor 1 worn by an operator, and the other is a machine body 2. The output of the pressure sensor 3 of the body protection sensor 1 is wirelessly transmitted from the transmission terminal 5 via the output cable 4. In the mechanical device 2, the signal transmitted from the transmission terminal 5 is received by the reception terminal 6, and when the control unit 7 determines that dangerous pressure is applied, the emergency signal is sent to the emergency stop means 8, thereby , And after the fall protection measures such as a slider, cut off the drive source.

  The pressure detector 3 is worn by a machine operator or an operator working around the machine. For example, an abnormal load applied to an operator working around the mechanical device is detected by attaching the device such as an arm to a position where the mechanical device can be contacted using a means such as a band.

  Further, the pressure detection unit 3 may be configured to be incorporated into clothes or attachments worn by the operator of the machine device or an operator working around the machine device. Detects an abnormal load on workers working in the vicinity.

  The signal detected by the pressure detection unit 3 is transmitted wirelessly from the transmission terminal unit 5 via the signal output cable 4.

  FIG. 2 is an explanatory view showing an example of the pressure detection unit 3, and is formed by integrating a normal cloth 11 with a pressure sensor 12 formed in a sheet shape or a foil shape. For the integration of the fabric 11 and the pressure sensor 12, a bonding method using an adhesive or a method such as pressure bonding depending on the material of the fabric can be applied.

  The pressure sensor 12 may be, for example, one having a structure in which thin films for electrodes are stacked on both sides of an aluminum nitride thin film. Aluminum nitride is well known as a piezoelectric material, and by making it a thin film, it becomes thin and deformable, and there is no sense of incongruity in integrating it with clothes.

  The pressure detector 3 configured in this way can be handled in the same way as a normal fabric, and is cut into a predetermined shape and sewn. That is, it can be incorporated by means such as sewing as part of work clothes worn by a driver or worker of the mechanical device. As a result, a part of work clothes or gloves worn by a driver or worker of the mechanical device can be used as a means for detecting abnormal pressure for body protection.

  FIG. 2 is an explanatory view showing a second embodiment of the pressure detection unit 3, and the pressure detection unit 3 of the body protection sensor incorporating a pressure sensor 14 formed in a strip shape together with the fiber 13 of a normal garment. An example is shown. The pressure sensor 14 is knitted as a part of the warp.

  By weaving the pressure sensor 14 at an appropriate interval in the warp, it can be configured so that there is no detection omission. It is possible to change the interval depending on the location to be applied as a body protection sensor.

  Here, as the strip-shaped sensor to be used, for example, a structure in which a thin film for electrodes is laminated on both sides of the thin film of aluminum nitride used in the first embodiment can be formed into a strip shape and used.

  The pressure detection unit 3 is cut into a predetermined shape and sewn on work clothes or gloves. Furthermore, the body protection sensor is completed by attaching the output cable 4 of the pressure sensor and connecting it to the terminal 3. In the case of a pressure sensor formed in a fiber shape, when the output sensor 4 is attached, the fibers of the pressure sensor 13 are connected to each other because the fibers of the pressure sensor 13 are divided when cut into a predetermined shape. It is necessary to do.

  Further, when the body protection sensor of the present invention is used as work clothes, it is necessary to consider that the output cable 4 is accommodated between the outer material and the outer material. Further, it is desirable that the transmission terminal portion 3 is provided with a storage location such as a pocket for storage in work clothes.

  In addition, when used as work clothes, even if it is difficult to use the pressure detection unit as a surface material, it can be sewn as work clothes with body protection sensors by using it as a lining material. Is possible.

  Wearing items such as gloves may also be used as part of the lining instead of the outer material. Moreover, if the part which contacts a machine is limited, you may use only for the part.

  Next, the implementation of the body protecting method according to the present invention will be described. The present invention is characterized in that a pressure sensor is incorporated in clothes or attachments worn by a machine operator or an operator who works around the machine, and the driver or the worker is in a natural form. It is desirable to incorporate a pressure sensor into the garment.

  Therefore, the operator of the mechanical device or the worker who works in the vicinity of the device usually works by always wearing a dedicated work clothes, and by incorporating the body protection sensor of the present invention into this work clothes, It is possible to reliably detect an abnormal load applied to the worker.

  The abnormal load applied to the operator of the machine device or the worker working in the vicinity of the machine device differs depending on the machine device, and it is different in which part of the work clothes the pressure detection unit 3 of the present invention is provided. It is appropriate to apply to parts such as hands, arms and legs.

  Here, a garbage truck will be described as an example of the mechanical device. An operator of the garbage truck inputs garbage from the garbage inlet of the garbage truck. It is assumed that the worker who performs the garbage collection work wears work clothes and gloves in which the body protection sensor according to the present invention is incorporated in the sleeve portion. In the case of a garbage truck, the first danger to the worker is that it is caught in the rotating plate of the loading device that compresses the garbage introduced from the garbage inlet and sends it to the garbage storage box. If an operator is accidentally wound on the rotating plate, abnormal pressure is applied to the operator. At that time, the signal value of the body protection sensor incorporated in the work clothes or gloves shows an abnormally high value.

  The signal of the body protection sensor incorporated in the work clothes worn by the worker is always sent to the control device of the mechanical device by wireless communication means, and an emergency stop signal is issued when an abnormal value is detected, The machine is stopped by the emergency stop means. If it is caught by garbage collection, it is necessary to minimize the damage to the human body, and after the rescue team arrives, it is necessary to take a drop protection measure such as a slider, cut the solenoid valve, and release the driving force.

  Other mechanical devices can be employed as a safety means for reliably protecting an operator from a sudden danger by a similar method.

  In the above description, the configuration of the pressure detection unit 3 has been described in the form of weaving as a fabric or an example in which it is integrated with the fabric. However, the present invention is not limited to this. You may wear | wear to a worker's body as a pressure detection means.

  Moreover, although the thin film of aluminum nitride was used as the pressure sensor of the present embodiment, the present invention is not limited to this, and any thin and deformable material can be used. Moreover, if it can be molded into a fiber shape, the application will be further widened.

The invention's effect

  The body protection sensor provided in the conventional mechanical device is usually installed in the mechanical device, and an optical detection means that a part of the worker's hand or body has entered the dangerous area. The method of detecting by is common.

  However, these methods cannot determine whether it is a part of the worker's body or something else, and reliably detect that there is a blind spot that cannot be detected by optical detection means. It was difficult to do.

  Since the body protection method of the present invention is a method of mounting a detecting means for detecting abnormal pressure on the operator or operator of the mechanical device, the operator or operator of the mechanical device is sandwiched or caught in the mechanical device. This can be reliably detected. As a result, it is possible to prevent a physical accident of a machine operator or worker, or to prevent damage to the minimum even if an accident occurs, and to cause an unnecessary machine stoppage. Therefore, safe operation of the mechanical device can be ensured without impairing the efficiency of the mechanical device.

  It is a block diagram which shows the system configuration | structure of the body protection method of this invention.   It is explanatory drawing which shows the example of the pressure detection part of a body protection sensor.   It is explanatory drawing which shows another example of the pressure detection part of a body protection sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body protection sensor 2 Machine apparatus main body 3 Pressure detection part 4 Output cable 5 Transmission terminal part 6 Reception terminal part 7 Control part 8 Emergency stop means 11 Cloth 12 Pressure sensor 13 Textile 14 Pressure sensor

Claims (6)

  A pressure sensor is attached to a body part that may be caught or caught in a movable part of the mechanical device, and the mechanical device generates an emergency stop signal based on a signal detected by the pressure sensor. Body protection method.   The body pressure protection method according to claim 1, wherein the pressure sensor is incorporated in clothes or an attachment of an operator who may be caught or caught in a mechanical device.   2. The body protecting method according to claim 1, wherein the pressure sensor is formed into a sheet shape, a foil shape, or a strap shape.   4. The body protecting method according to claim 3, wherein the pressure sensor formed in a sheet shape, a foil shape or a strap shape has a structure in which an aluminum nitride thin film layer and an electrode layer are laminated.   The body protection method according to claim 1, wherein a signal of the pressure sensor is transmitted to a mechanical device by wireless communication means.   The body protection method according to claim 1, wherein the mechanical device is immediately stopped by the emergency stop signal.

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