JP2019005425A - Safety belt use state confirmation system - Google Patents

Abstract

To provide a safety belt use state conformation system capable of detecting a use state, such as whether or not an operator has locked a hook, even in a work site where the operator moves around in a wide range, and thereby preventing a fall from a high place.SOLUTION: In a safety belt use state confirmation system 1 having a mounting body 3 such as a trunk belt 31 and a harness 32 mounted to an operator, a rope 4 connected to the mounting body 3, and a hook 5 attached to the other end side of the rope 4, an acceleration sensor 6a is attached to a hook 5. When the acceleration sensor 6a has detected an acceleration equal to or greater than a predetermined value, it is determined that the hook 5 is locked to a fixed part 8 of a work site, and lock detection means 71 is used to determine whether or not the hook 5 is properly locked in comparison with a reference value corresponding to a work pattern.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a safety belt usage status confirmation system that can check the usage status of a safety belt used during high-altitude work. More specifically, the present invention can detect whether or not a hook is locked to a fixed part in the field. The present invention relates to a safety belt usage status confirmation system.

  Generally, when working at high places such as construction sites, utility poles, steel towers, etc., a safety belt is used to prevent the operator from falling. The safety belt includes a body belt and a harness attached around the waist of the worker, a rope attached from the attachment body via a D ring, a winder, a shock absorber, and an expansion / contraction adjuster, and the rope It is configured with a hook attached to the tip side of the machine, and it can be prevented from falling by locking this hook to a fixed part such as a handrail, wire, master rope, locking tool at the work site It is a thing.

  By the way, in recent years, in such a safety zone, a system described in Patent Document 1 has been proposed as being able to detect that an operator has dropped from a high place.

  This system is equipped with a load detection sensor on the hook side of the safety belt so that when a load greater than a predetermined value is detected by this load detection sensor, it can be determined that the operator has fallen and notified. . If such a system is used, when an operator falls, it can be quickly applied to rescue, and the worker can be rescued quickly.

  However, even if such a system is used, if the worker is not wearing a safety belt in the first place, or if the hook is not locked to the fixed part, the fact that it has fallen from a high place is detected. I can't.

  Therefore, as shown in Patent Document 2 or the like, it has been proposed that an operator can detect whether or not a safety belt has been securely attached.

  In this system, an electromagnetic induction sensor, a pressure sensor, an acceleration sensor, etc. are attached to a belt worn on the worker's body so that it can be detected whether or not a safety belt is worn on the body. A rope attached to a fixed part such as a picking lift or a ladder car is locked to a body belt via a hook, and at that time, the hook is locked to the belt from electromagnetic coupling or circuit coupling of electric wiring. It can be detected whether or not. By using such a system, it is possible to detect whether or not the worker wears a safety belt, and it is possible to determine whether or not the operator is working with the hook locked to the mounting body. become.

JP 2011-104339 A JP 10-337336 A

  However, such a system as described in Patent Document 2 has a rope attached in advance to a fixed place such as a picking lift or a ladder car, and this is connected to a belt on the body side via a hook. For example, when it is used in a work site that moves around a wide area using a scaffold, it is not practical because ropes must be attached everywhere in advance.

  Therefore, in order to solve the above-mentioned problems, the present invention allows the operator to detect the usage situation such as whether or not the operator has locked the hook even in a work site that moves around a wide range, and falls from a high place. It is an object of the present invention to provide a safety belt usage status confirmation system that can prevent the above-mentioned problem.

  That is, in order to solve the above-mentioned problem, the present invention has an attachment body attached to the body of an operator, a rope connected to the attachment body, and a hook attached to the other end side of the rope. In the safety belt usage status confirmation system comprising the safety belt, the lock detection means for detecting whether or not the hook is locked to the fixed portion of the work site by attaching an acceleration sensor to the hook and outputting from the acceleration sensor Is provided.

  If comprised in this way, it will become possible to detect now whether the hook was locked to the fixed part by the output of the acceleration sensor attached to the hook, and to prevent falling from a high place beforehand Will be able to.

  In such an invention, the locking detection means is used to detect both whether or not a safety belt is attached and whether or not the hook is locked to the fixed portion.

  With this configuration, it is possible to securely attach the safety belt, and at the same time, it is possible to prevent falling from a high place by detecting whether the hook is locked to the fixed portion. Will be able to.

  Furthermore, when a separation detection sensor for detecting that the hook has been detached from the mounting body is provided, and when it is detected by the separation detection sensor that the hook has been detached from the mounting body, using the locking detection means, The acceleration sensor detects whether or not the hook is locked to a fixed part at the work site.

  With this configuration, it is possible to clearly distinguish between a state in which the hook is locked to the mounting body and moves around and a state in which the hook is locked to the fixed part at the work site. Can be reliably detected.

  In addition, when the acceleration sensor detects an acceleration of a predetermined value or more along the hook locking direction using the locking detection means, it is determined that the hook is locked to the fixed portion at the work site.

  If comprised in this way, even if it is a case where the acceleration of a direction different from the hook locking direction is detected by walking etc., it will become possible to distinguish and judge hook locking now and a walking state clearly. .

  In addition, the hook locking pattern corresponding to the work pattern is stored in advance, and compared with the reference value of the stored locking pattern and the locking state in which the hook is locked by the locking detection means, The comparison result is output.

  If comprised in this way, it will become possible to judge now whether the hook was appropriately latched by the fixing | fixed part according to the work pattern.

  According to the present invention, a safety provided with a safety belt comprising an attachment body attached to the body of an operator, a rope connected to the attachment body, and a hook attached to the other end of the rope. In the belt usage status confirmation system, since an acceleration sensor is attached to the hook, and an output from the acceleration sensor is provided with a locking detection means for detecting whether the hook is locked to a fixed part of the work site, The output of the acceleration sensor attached to the hook can detect whether or not the hook is locked to the fixed portion, and can prevent the fall from a high place.

Schematic of a safety belt usage status confirmation system according to an embodiment of the present invention Functional block diagram in the same form The figure which shows the structure of the hook in the same form The figure which shows the waveform detected by the acceleration sensor in the same form, and the waveform detected by the magnetic sensor The figure which shows the timing locked in the same form The figure which shows the work pattern in the form Flow chart of safety belt usage status confirmation system in the same form

  Hereinafter, the safety belt use status confirmation system 1 of the present invention will be described with reference to the drawings.

  The safety belt usage status confirmation system 1 according to this embodiment is used when working while moving a scaffold or the like at a construction site. As shown in FIG. A safety band 2 and a server 7 having a body 3, a rope 4 connected to the mounting body 3, and a hook 5 attached to the distal end side of the rope 4 are configured. Characteristically, in this embodiment, the acceleration sensor 6a is attached to the hook 5, and the latch detection means for detecting whether or not the hook 5 is locked to the fixed portion 8 by the output from the acceleration sensor 6a. 71 (see FIG. 2) and the like. Hereinafter, the safety belt use state confirmation system 1 in the present embodiment will be described in detail.

  First, the attachment body 3 attached to the worker's body is composed of a torso belt 31 attached to the operator's waist, a harness 32 attached to the shoulder / chest, and the like. The belt 31 and the harness 32 are attached so as to be in close contact with the body using a buckle or the like. A locking portion 34 for locking the hook 5 of the safety belt 2 is attached to the mounting body 3, and the hook 5 can be attached to the locking portion 34 and moved.

  The rope 4 is composed of a string or a band having a strength capable of withstanding a load at the time of dropping. The rope 4 is attached to the back of the harness 32 and the like (not shown), a winder, a shock absorber, It is attached via an expansion / contraction adjuster.

  The hook 5 is attached to the other end side of the rope 4 via a joint portion 41 such as a universal joint or a joint ring, or directly, as shown in FIG. A sensor mounting portion 5b is provided. Of these, the hook body 5a has a bowl-shaped body 51 configured in a bowl shape, a single-opening blade 52a that opens and closes an opening of the bowl-shaped main body 51, and prevents the single-opening blade 52a from being opened unexpectedly. When the hook 5 is locked to the fixing portion 8 (see FIG. 1), the half-opening blade 52a and the auxiliary blade are resisted against the force of a spring (not shown). 52b is rotated so as to be brought inward at the same time, and the regulating portion 53 of the one-sided blade 52a is separated from the auxiliary blade 52b. As a result, the one-sided blade 52a rotates inside the bowl-shaped main body 51, and the hook main body 5a can be locked to the fixing portion 8. In this way, when the hook body 5a is locked to the fixed portion 8, the one-sided blade 52a and the auxiliary wing 52b are returned to their original positions by the force of the spring, whereby the restricting portion 53 of the one-sided blade 52a is assisted. Since the blades 52b are fixed in contact with the blades 52b, the one-sided blades 52a are prevented from opening unexpectedly.

  On the other hand, the sensor attachment portion 5b is fixed to the base end portion of the hook body 5a via a pin, and an opening 54 for attaching the box 60 having the acceleration sensor 6a is provided inside. I have to. The sensor mounting portion 5b is provided along a plane along the hook body 5a, that is, a plane including the bowl-shaped main body 51, the one-sided blade 52a, and the auxiliary wing 52b, and the acceleration sensor 6a is attached to the sensor mounting portion 5b. The acceleration in the locking direction of the hook 5 is specified so that the locked state can be detected. That is, when the acceleration sensor 6a is attached to the hook body 5a so as to be swingable via a string or the like, the acceleration sensor 6a swings in various directions during walking or the like, and the hook 5 is fixed to the fixing portion 8. It becomes difficult to specify the direction of the acceleration applied when it is locked. For this reason, in this embodiment, the acceleration sensor 6a is fixedly attached to the hook body 5a.

  The acceleration sensor 6a can detect acceleration in the XYZ-axis directions, and is installed in a box 60 containing a battery. In addition to the acceleration sensor 6a, a magnetic sensor, a gyro sensor, and the like are attached to the box 60, and the state of the operator can be detected using these sensors.

  The acceleration detected by the acceleration sensor 6a is wirelessly transmitted to the server 7 side as shown in FIGS. 1 and 2, and is locked to the fixed portion 8 using the locking detection means 71 of the server 7. Is judged. Here, the locking state can be detected using the locking detection means 17 of the server 7, but the locking state can be determined in the box 60 to which the acceleration sensor 6a is attached. Good.

  Next, the structure of the locking detection means 71 for determining this locking state will be described.

  Normally, when an operator who carries the hook 5 walks, the acceleration sensor 6a swings due to the walk, and periodic acceleration is detected as shown in the upper waveform of FIG. And it can be judged that the operator is wearing the safety belt 2 by detecting the acceleration more than a predetermined value. Further, when the magnetic sensor is mounted in the box 60, the magnet 6c is put in the operator's pocket, thereby causing the magnetic sensor of the hook 5 locked to the locking portion 34 to react, thereby working. It is determined that the person wears the safety belt 2.

  Next, when the worker locks the hook 5 to the fixing portion 8, as shown in the upper waveform diagram of FIG. 4, an acceleration equal to or higher than a predetermined gravitational acceleration is detected downward in the plane direction of the hook 5. Although this acceleration also changes depending on the size of the hook body 5a, for example, a timing at which an acceleration of 2G or more is detected is detected. And the timing at which the gravitational acceleration of a predetermined value or more (2G or more) is detected downward in the plane direction is stored (state of FIG. 5). Thereby, it can be determined whether or not the operator has locked the hook 5 to the fixing portion 8.

  By the way, when detecting the locking state of the hook 5 in this way, it is necessary to clearly distinguish the case where the hook 5 is locked to the mounting body 3 and the case where the hook 5 is locked to the fixing portion 8. is there. Therefore, in this embodiment, a separation detection sensor 6b that detects that the hook 5 has been detached from the locking portion 34 of the mounting body 3 is provided.

  Various sensors can be used as the detachment detection sensor 6b. For example, a magnetic sensor is attached in the box 60, and a magnet 6c or the like is attached to the body correspondingly. Keep it. When the hook 5 is detached from the locking portion 34 of the mounting body 3, that is, when the magnet 6c is separated from the separation detection sensor 6b that is a magnetic sensor, the hook 5 is detached from the locking portion 34 of the mounting body 3. Detected. Then, the locked state to the fixed portion 8 can be determined based on the value of the acceleration sensor 6a detected thereafter. This detached state will be described with reference to the waveform diagram of FIG. In the lower waveform of FIG. 4, the waveform that protrudes largely upward indicates that the separation detection sensor 6 b is approaching the magnet 6 c, and the small waveform indicates that the separation detection sensor 6 b has detached the hook 5 from the body. It shows the state. Therefore, the locking state of the hook 5 is detected by using the acceleration sensor 6a within the time when the removal of the hook 5 is detected by the separation detection sensor 6b. Here, a magnetic sensor is used as the detachment detection sensor 6b. However, in addition to this, a limit switch or the like is provided in the locking portion 34 of the mounting body 3, and the hook 5 is connected to the locking portion 34 of the mounting body 3. You may make it detect having latched.

  By the way, when the hook 5 is locked to the fixed portion 8 at the work site, it is necessary to detect whether or not the hook 5 is properly locked. Therefore, in order to detect whether or not the hook 5 is properly locked, the following determination is made using the locking detection means 71.

(1) Judgment by comparison between the number of times of locking per predetermined time and a reference value For example, the number of times of locking per predetermined time is stored as a reference value such as 20 times / 5 minutes, and this reference value is exceeded. If it is, it is determined to be “appropriate”. At this time, since the locking state varies depending on the work site, the reference value for each work pattern is set in advance as shown in FIG. 6, and the reference value of the worker corresponding to the work pattern is set as the reference value. 5 is compared with a locking timing at which an acceleration of 2G or more is detected in FIG. 4 to determine whether or not the locking state is appropriate.

(2) Judgment based on comparison between grouped lock state and reference value For example, as shown in the lower diagram of FIG. 5, a series of locks locked within several seconds is determined as one lock, and the grouping is performed. By comparing the number of times of locking and the number of times of locking that is a reference value, it is possible to determine whether or not locking is properly performed. Such a method can be suitably used in operations where frequent locking is performed.

(3) Judgment based on comparison of movement distance and number of times of locking For example, when movement in the horizontal direction (XY direction) is detected by the acceleration sensor 6a, is locking more than a reference value within a moving range of a predetermined distance? It is also possible to determine whether or not locking is properly performed. Thereby, it is possible to determine whether or not the hook 5 is locked each time the work place is changed.

(4) Judgment based on the time interval between the previous lock and the current lock For example, the timer is operated from the time of the previous lock and it is determined whether or not the next lock is performed within a predetermined time. By doing so, it can also be determined whether or not the locking is properly performed.

(5) Judgment when a plurality of hooks 5 are provided For example, when two hooks 5 and ropes 4 are provided and the operation is performed while the hooks 5 are alternately locked, the hook 5 is locked. It is determined whether or not the locking is properly performed based on whether or not the time from the locking to the next locking in the other hook 5 overlaps with the time from the locking to the next locking. You can also. At this time, a similar acceleration sensor 6a is attached to each hook 5 so that the respective locking states can be determined.

  Then, by making such a determination, when it is detected that it is not properly locked, a warning is sent to the worker, and the locked state history of the worker is stored in the storage unit. Or print processing.

  Next, a usage example of the safety belt usage status confirmation system 1 configured as described above will be described with reference to the flowchart of FIG.

  First, the worker wears the mounting body 3 when performing the work, and puts the magnet 6 c in the pocket of the work clothes, etc., so that the hook 5 is locked to the locking portion 34 of the mounting body 3. Then, in this state, climb to a high place and work. At this time, since the magnet 6c and the separation detection sensor 6b are close to each other, a large waveform is detected as shown in the waveform of the magnetic sensor in FIG. 4, and the determination of the locked state by the acceleration sensor 6a is not performed. .

  When the worker works at a high place, the acceleration sensor 6a detects periodic acceleration as the worker moves. Thereby, it can be determined that the mounting body 3 is mounted (step S1). Or it can also be judged that the mounting body 3 is mounted by the detachment detection sensor 6b reacting to the magnet 6c.

  Next, when the worker performs work, the hook 5 is detached from the locking portion 34 of the mounting body 3 and the hook 5 is locked to the fixing portion 8 such as a handrail. At this time, when the hook 5 is removed from the engaging portion 34 of the mounting body 3, the separation detection sensor 6b detects the separation state of the hook 5 (step S2), and the acceleration sensor 6a attached to the hook 5 is detected. Whether the hook 5 is locked to the fixing portion 8 is determined based on the value of (step S3). At this time, when an acceleration of a predetermined value or more directed downward in the planar direction of the hook 5 is detected, it is determined that the hook 5 is locked to the fixing portion 8, and the locked timing is stored (step S4). ).

  On the server 7 side, it is determined whether or not the hook 5 is properly locked in accordance with the detection state of the separation detection sensor 6b, the value from the acceleration sensor 6a, and the work pattern of the worker (step). S5).

  At this time, when the number of times of locking per predetermined time is compared with a reference value, if the reference value is below that reference value per predetermined time, it is determined that locking is not properly performed.

  Alternatively, when determining the grouped locking state and the reference value, it is determined that the locking state in which the next locking is within 3 seconds is one locking, and the number of grouped lockings and the reference value Compare the number of times. Then, when the number of times of locking is below the reference value, it is determined that locking is not properly performed.

  Further, when making a determination by comparing the horizontal movement distance and the number of times of locking, the acceleration sensor 6a detects the horizontal movement and determines whether or not the locking is greater than the reference value within a predetermined distance. Then, it is determined whether or not the locking is properly performed.

  Also, when making a determination based on the time interval between the previous lock and the current lock, the timer is activated from the time of the previous lock and whether or not the next lock is performed within a predetermined time. By judging the above, it is judged whether or not the locking is properly performed.

  Further, when a plurality of hooks 5 are provided and alternately locked, the time from the locking of one hook 5 to the next locking and the time from the locking of the other hook 5 to the next locking. By determining whether or not they overlap, it is determined whether or not the locking is properly performed.

  Then, by making such a determination, if it is determined that it is not properly locked, a warning or the like is notified to the worker (step S6).

  As described above, according to the above-described embodiment, the attachment body 3 attached to the worker's body, the rope 4 connected to the attachment body 3, and the hook 5 attached to the other end of the rope 4 are provided. In the safety belt usage status confirmation system 1 provided with the safety belt 2 provided, an acceleration sensor 6a is attached to the hook 5, and the hook 5 is locked to the fixing portion 8 at the work site by the output from the acceleration sensor 6a. Since it is provided with the locking detection means 71 for detecting whether or not the hook 5 is locked, the acceleration sensor 6a attached to the hook 5 can be used to detect whether or not the hook 5 is locked to the fixing portion 8. Thus, it is possible to prevent a fall from a high place.

  In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.

  For example, in the above-described embodiment, after detecting that the hook 5 is detached from the mounting body 3, the locking state to the hook 5 is detected, but the removal of the hook 5 from the mounting body 3 is detected. All the locked states of the hooks 5 may be detected without doing so.

  In the above embodiment, the locking state is detected based on the magnitude of the acceleration detected by the acceleration sensor 6a. However, the locking state may be detected based on an acceleration waveform pattern.

  In the above-described embodiment, it is determined whether or not the server 7 is properly locked by transmitting an acceleration. As an example, a dedicated application is stored in a mobile terminal such as a smartphone. The application may be used to determine whether or not the locking is appropriate, or to make an alarm.

  Moreover, in the said embodiment, although the appropriate determination of the locking was performed, various methods can also be used for this appropriate determination.

DESCRIPTION OF SYMBOLS 1 ... Safety belt use condition confirmation system 2 ... Safety belt 3 ... Wearing body 4 ... Rope 5 ... Hook 6b ... Sensor attachment part 6a ... Acceleration sensor 6b ... Detachment Detection sensor 71 ... Locking detection means 8 ... Fixing part

Claims (5)

In a safety band usage confirmation system comprising a safety band comprising a mounting body to be mounted on a worker's body, a rope connected to the mounting body, and a hook attached to the other end of the rope. ,
Attach an acceleration sensor to the hook,
A safety belt usage status confirmation system comprising: a locking detection means for detecting whether or not a hook is locked to a fixed part at a work site by an output from the acceleration sensor. 2. The safety band according to claim 1, wherein the locking detection means is used to detect whether a safety band is attached and whether the hook is locked to a fixed portion. Usage confirmation system. A separation detection sensor for detecting that the hook has been detached from the wearing body is provided,
When it is detected that the hook is detached from the mounting body by the separation detection sensor, it is detected whether or not the hook is locked to the fixed portion of the work site by the acceleration sensor using the locking detection means. The safety belt usage status confirmation system according to claim 1 as described above. The locking detection means determines that the hook is locked to a fixed part at the work site when acceleration of a predetermined value or more is detected by the acceleration sensor along the hook locking direction. The safety belt use status confirmation system according to claim 1. In the safety belt usage status confirmation system according to claim 1,
The latch pattern corresponding to the work pattern is stored in advance, and the reference value of the stored latch pattern is compared with the latch state in which the hook is latched by the latch detection means, and the comparison result Safety belt usage status confirmation system that outputs.

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