JP2024078317A - Rotation detection device and rotation detection system - Google Patents

Abstract

[Problem] To provide a rotation detection technology that can also be applied to the early detection and early recovery of tangled fishing line in the sea during squid fishing operations using a squid fishing machine. [Solution] A rotation detection device 10 is a device for detecting the rotation r of a driven rotor R that rotates due to the rotation q of a driving rotor Q, and is configured to include a base 2 that is designed to be attached to the rotating shaft of the driven rotor, rotation detection means, i.e. sensors 3A and 3B, provided on the base, and a signal processing unit 4 that wirelessly transmits information related to the rotation of the driven rotor obtained by the sensors to the outside. An angular velocity sensor can be used as the sensor. [Selected Figure] Figure 1

Description

The present invention relates to a rotation detection device and a rotation detection system, and is highly useful in the industrial field, for example as a method for early detection of tangled fishing line problems in squid fishing.

Figure 13 is an explanatory diagram showing a situation where a line entanglement problem occurs in a line fishing method using a squid fishing machine. As shown in the figure, line fishing using a squid fishing machine SC is performed by simultaneously operating multiple squid fishing machines SC, SC, ... installed on a ship. The line BD to which the squid fishing hook ND (the tackle, hereinafter simply referred to as "squid hook") is attached is paid out and lowered into the sea by rotating the drum DM of each squid fishing machine SC, and the squid caught on the squid hook ND is brought up on the ship by reeling in the line BD with the drum DM. The above trouble occurs when the squid hook ND gets entangled with the squid hook ND operated by another squid fishing machine SC during operation due to changes in the ocean currents or other creatures such as sharks getting caught in the squid hook ND, making it impossible to operate normally. There is also a problem when the line BD breaks and the weight (weight) WT comes off.

Figure 14 is an explanatory diagram showing a conventional method for detecting tangled fishing line. Also, Figure 15 is a photograph showing an example of the front roller shown in Figure 14. As shown in these figures, conventional detection of tangled fishing line is performed by providing a hook HK for detecting the hooking of fishing line BD near the front roller MR. That is, when tangled fishing line occurs, the fishing line BD and squid hook ND are wound up by the drum DM in that state, and when they reach the front roller MR position, they are caught by the hook HK attached to the front roller MR peripheral device, and when the hook HK is activated, the emergency stop switch (emergency stop means) ES on the back of the squid fishing machine connected to it is activated, automatically stopping the squid fishing machine SC. After stopping, the fishing line tangle is confirmed, and recovery and necessary safety measures are taken. Note that Figure 16 is an explanatory diagram showing a conventional emergency stop operating mechanism, and a comparison with Figure 12 of the present invention will be described later.

Many patent applications have been filed for technologies related to squid fishing machines. For example, Patent Document 1, listed below, discloses a technology for preventing squid caught on squid hooks from falling off the hooks and falling into the sea as they pass through guide rollers, thereby increasing fishing efficiency. When a fishing line with multiple squid hooks is guided into the ship by a winding machine through guide rollers, a hook rod is provided protruding approximately vertically from the periphery of the body of the guide roller, and the hook rod is used to pierce the squid caught on the squid hooks and prevent them from falling into the sea while the guide roller is transported and guided.

Patent Document 2 also discloses a fishing winding device that can reduce the effect of rocking caused by both the pitching and rolling of the hull on the reeling in of fishing gear. The device is made up of a rotating drum that is attached to the hull and that winds up and down the fishing gear, a drive means that drives the rotating drum, a detection means that detects the vertical rocking speed caused by the pitching of the hull and the rocking angular speed around an axis extending in the fore-aft direction of the hull caused by the rolling of the hull, and a control means that controls the drive means in response to a signal from the detection means.

JP 2000-245318 A "Fishing line guide roller for squid fishing machine" JP 2013-34397 A "Fishing Winding Device"

In order to clarify the problems with the conventional technology described above with reference to FIG. 13 etc., a further explanation will be given.
FIG. 17 is an explanatory diagram showing a normal operation state using a squid fishing machine. In the conventional technology, the line BD, which is entangled due to the entanglement of squid hooks ND, cannot be detected until it is reeled up to the position of the hook HK shown in FIG. 14 and activated, and in many cases, the line BD is already complicatedly entangled by the time the detection mechanism of the hook HK is activated. In such a case, the recovery work to untangle the line BD takes a considerable amount of time. It is desirable to have a system that can detect entanglement in the sea at an early stage and stop the squid fishing machine SC when it occurs. In addition, A, B, C, D, E, and F in this figure are drum DMs, and No. 1, No. 2, and No. 3 are squid fishing machines SC. The same applies to FIG. 18 described later.

In addition, if the weight WT hanging from the tip of the squid hook ND becomes detached during operation due to deterioration of the fishing line BD or the fishing line breaking due to overload, etc., if the squid fishing machine SC reels up the drum DM in this state, the squid hook ND may fly out and get caught on a person, causing injury. However, conventional technology is unable to detect this danger and stop the squid fishing machine SC. A method with greater safety is required.

As shown in Figure 17, the squid fishing machine SC is operated by repeatedly raising and lowering the drum DM. Depending on the situation, the squid hook ND that is reeled in by the rising drum DM may get caught on the fishing line BD inside the same drum DM, and when the drum DM is lowered again, the squid hook ND may be reeled in instead of lowering. This is called reverse winding (reverse winding phenomenon). If operation continues with reverse winding occurring, the squid hook ND will come off the front roller MR, become tangled, and accumulate there. When this happens, it will take a considerable amount of time to recover. When such a situation occurs, the current device is unable to detect it and stop the squid fishing machine SC.

Figure 18 is an explanatory diagram showing the operating conditions when using a squid fishing machine with a fishing line attached to only one side of the drum. As shown in the figure, when changing the type of squid hook ND, the squid fishing machine SC may be operated with the squid hook ND attached to only one side of the drum DM. In this case, the above-mentioned problems may occur, but the current device cannot detect this and stop the squid fishing machine SC. There is a demand for more practical safety measures.

The problem that this invention aims to solve is to provide a technology that eliminates the problems of the conventional technology, detects and discovers tangled fishing line in the sea during squid fishing operations using a squid fishing machine as early as possible, and enables a quick recovery. Another problem of this invention is to provide a technology that can effectively prevent the reverse winding phenomenon, in which the squid hook does not descend but is wound up when the drum is lowered. Furthermore, these problems with tangled fishing line pose the risk of the squid hook flying off due to the line breaking, etc., and solving the problem of this invention is also an effective measure to prevent such danger.

Furthermore, the object of the present invention is not limited to technology for early detection of problems when using squid fishing machines, but is to provide a rotation detection device and rotation detection system that can directly detect the rotation of a driven rotor in all industrial fields where it is useful to directly detect the rotation of a driven rotor that rotates due to the rotation of such a drive rotor.

The inventors of the present application have studied the above problem. As a result, they have noticed that when the fishing line gets tangled in the sea, there is always something wrong with the rotation of the front roller. In other words, the occurrence of fishing line tangles in the sea can be detected early by immediately noticing and detecting any abnormality in the rotation of the front roller while the squid fishing machine is in operation. In fact, if the crew of the squid fishing boat can detect an abnormality in the rotation of the front roller before it is detected by the hook method described above, they can immediately stop the operation of the squid fishing machine and manually reel in the drum, which can easily restore the tangled squid hooks. The earlier it is discovered, the shorter the time it takes to restore the hooks.

However, when other work such as packing is being done, or when a problem occurs with one of the multiple squid fishing machines that is not being monitored, a quick response is not possible, and there are limitations to the crew's monitoring of the front roller, making it unreliable. A certain new detection method must be devised. The inventor focused on the phenomenon of abnormal rotation of the front roller. Meanwhile, conventional methods for detecting rotation include those using optical sensors and magnetic sensors, but the usage environment is too harsh due to the common presence of seawater and squid ink, and no suitable method has been found.

The inventor came up with a configuration in which a rotation detection device having two acceleration sensors is attached to the shaft of the front roller, information on the rotation status of the two front rollers is wirelessly sent to a receiving unit installed inside the squid fishing machine, the operating status of the squid fishing machine, i.e., the relationship between the rotation of the driving side rotor and the rotation of the two front rollers, i.e., the driven side rotor, is monitored, and the squid fishing machine is stopped in an emergency in the event of an abnormality. Furthermore, the inventor came up with the idea that it is sufficient to use a wide range of means and sensors for detecting rotation, not limited to two acceleration sensors, for example, an angular velocity sensor can be suitably used. The inventor found that these can solve the above-mentioned problems that are not limited to the field of squid fishing, and based on this, the present invention was completed. In other words, the invention claimed in this patent application as a means for solving the above-mentioned problems, or at least the invention disclosed therein, is as follows.

[1] A rotation detection device for detecting rotation of a driven-side rotating body that rotates due to rotation of a driving-side rotating body, comprising:
A base body having a specification for being attached to the driven rotating body;
A rotation detection means or sensor provided on the substrate;
and a signal processing unit that wirelessly transmits information relating to the rotation of the driven rotor obtained by the sensor to an outside.
[2] The rotation detection device according to [1], characterized in that the sensor obtains rotation speed information and rotation direction information.
[3] The rotation detection device according to [2], characterized in that the signal processing unit includes a calculation processing unit that performs predetermined calculation processing on the detection signal obtained by the sensor to generate the rotation speed information and the rotation direction information.
[4] The rotation detection device according to [2], wherein the signal processing unit transmits the detection signal obtained by the sensor to an outside, and the rotation speed information and rotation direction information are generated outside the device.
[5] The rotation detection device according to [2], which is attached to each of a plurality of driven rotors and is used to monitor the rotation state between each of the driven rotors.
[6] The rotation detection device according to [5], characterized in that it is used for detecting the rotation of a front roller that constitutes a squid fishing machine.

[7] The rotation detection device according to any one of [1], [2], [3], [4], [5], and [6], characterized in that the sensor is an angular velocity sensor.
[8] The rotation detection device according to [2], which is attached to one or more driven-side rotating bodies that rotate due to the rotation of the driving-side rotating body;
a receiving device for receiving information transmitted from a signal processing unit of the rotation detection device,
A rotation detection system characterized in that it is used for monitoring the rotational state between each driven rotor or each driven rotor based on detected rotation speed information and rotation direction information.
[9] The rotation detection system according to [8], further comprising a setting command device that wirelessly transmits settings for communication connection in the receiving device and other setting information to the receiving device.
[10] The rotation detection system according to either [8] or [9], further comprising an emergency stop means for emergency stopping the rotation of the drive-side rotor when a predetermined condition is met based on monitoring of the rotational state between the driven rotors or of each driven rotor.
[11] The rotation detection system according to [10], further comprising a drive-side operation detection means for detecting operation of the drive-side rotating body.
[12] The rotation detection system according to either [8] or [9], characterized in that it is used for detecting the rotation of a front roller that constitutes a squid fishing machine.

The inventions disclosed in this application also include the following inventions.
In the rotation detection device;
[P01-5] Any of the above rotation detection devices, characterized in that the base has a major axis/minor axis ratio of more than 1.
In a rotation detection system;
[P01-13] The rotation detection system according to any one of the above, characterized in that the drive-side rotating body is driven by a motor, and the drive-side operation detection means is a current sensor that detects a current related to the drive of the motor.
[P01-14] The rotation detection system according to any one of the above, characterized in that the detection information by the drive side operation detection means is transmitted to the receiving device.
[P01-15] A rotation detection system as described above, characterized in that it is provided with an emergency stop means for emergency stopping the rotation of the drive side rotor when a predetermined state is encountered based on monitoring of the rotation state between the driven rotors or of each driven rotor, and is configured not to operate the emergency stop means when no detection is performed by the drive side operation detection means.
Squid fishing system:
[P01-17] A squid fishing system comprising any one of the rotation detection systems described above.
[P01-18] Any of the squid fishing systems described above, characterized in that the information received by the receiving device is used for motor drive control.

The rotation detection device and rotation detection system of the present invention are configured as described above, and therefore, according to them, troubles such as tangled fishing line in the sea during squid fishing operations using a squid fishing machine can be discovered and detected as early as possible, and the troubles can be quickly untangled and restored, allowing operations to be resumed as soon as possible. In addition, it is possible to effectively prevent the reverse winding phenomenon in which the squid hook does not descend but reeles in when the drum is lowered. In addition, in the case of troubles with tangled fishing line, there is a risk that the squid hook will fly off due to the line breaking, etc., but according to the present invention, such a risk can be effectively prevented in advance. Furthermore, if the fishing line descends deeper near the seabed and tangled fishing line occurs, it can be discovered and dealt with early. In other words, according to the present invention, tangled fishing line can be discovered early, reducing the time and effort required to restore the squid hook, and allowing the crew to carry out safe operations.

Furthermore, with the rotation detection device and rotation detection system of the present invention, it is possible to obtain information on the motion state of the entire drive rotor-driven rotor coupling mechanism and the motion state of the environment in which the entire mechanism is placed, based on the detected rotation speed of the driven rotor, and to use this information to control the motion state of the entire mechanism. For example, in a squid fishing system, if the boat rolls and pitches while the squid fishing machine is descending and the center of gravity drops, the rotation speed of the front roller slows down, and the opposite is true when the machine is ascending. This makes it possible to know the rolling amplitude of the waves during operation based on the rotation speed of the front roller. By sharing this information, it is also possible to control the operating speed according to the waves and swell.

Furthermore, the rotation detection device and rotation detection system of the present invention are not limited to being used as a technology for early detection of problems when using a squid fishing machine, but can also directly detect the rotation of a driven rotor that rotates due to the rotation of a driving rotor. Therefore, the present invention can be used to obtain such effects in all devices and systems in which it is useful to directly detect the rotation of a driven rotor, and in the industrial fields in which they are related.

1 is a conceptual explanatory diagram showing a basic configuration of a rotation detection device according to the present invention; 1 is a conceptual explanatory diagram showing a basic configuration of a rotation detection device of the present invention (configuration using a pair of acceleration sensors). FIG. 13 is a conceptual explanatory diagram showing a case where the rotation detection device of the present invention is used for a plurality of driven rotors. FIG. 13 is a conceptual explanatory diagram showing a case where the rotation detection device of the present invention is used in parallel with a plurality of driven rotors. 1 is an explanatory diagram showing a configuration example of a rotation detection device according to the present invention; 4 is a graph specifically showing a rotation detection pattern in an angle sensor of the rotation detection device shown in FIG. 3 . 1 is a conceptual explanatory diagram showing a basic configuration of a rotation detection system according to the present invention; FIG. 11 is a conceptual explanatory diagram showing another configuration of the rotation detection system of the present invention. FIG. 1 is a conceptual explanatory diagram showing a configuration of a rotation detection system of the present invention equipped with a setting command device. FIG. 1 is a conceptual explanatory diagram showing an example of use of a squid fishing machine as an example of the configuration of a rotation detection system of the present invention equipped with an emergency stop means for a drive-side rotor. FIG. 9 is a block diagram of the rotation detection system of the present invention illustrated in FIG. 8. FIG. 13 is an explanatory diagram showing measures taken when using the rotation detection system of the present invention in the case of single drum operation. FIG. 2 is a conceptual explanatory diagram showing a configuration of a rotation detection system of the present invention equipped with a drive side operation detection means. FIG. 13 is a conceptual explanatory diagram showing a configuration of the rotation detection system of the present invention equipped with a drive-side operation detection means, in which the system is used in parallel for a plurality of driven-side rotating bodies. FIG. 1 is a conceptual explanatory diagram showing a configuration example of a squid fishing system according to the present invention. This is an explanatory diagram showing a situation where a problem occurs in squid fishing near the seabed. (The following figures relate to the prior art.) FIG. 1 is an explanatory diagram showing a situation in which trouble such as tangling of fishing line occurs in a pole-and-line fishing method using a squid fishing machine. FIG. 1 is an explanatory diagram showing a conventional method for detecting tangled fishing line. FIG. 15 is a photograph showing an example of the front roller shown in FIG. 14 . FIG. 1 is an explanatory diagram showing a conventional emergency stop operating mechanism. FIG. 1 is an explanatory diagram showing a normal operating condition using a squid fishing machine. FIG. 1 is an explanatory diagram showing the operation of a squid fishing machine with fishing line attached to only one side of the drum. FIG. 4 is an explanatory diagram showing an example of mounting an acceleration sensor. FIG. 13 is an explanatory diagram showing an example of mounting an angular velocity sensor;

The present invention will now be described in detail with reference to the drawings.
FIG. p1 is a conceptual explanatory diagram showing the basic configuration of the rotation detection device of the present invention.
In the figure, (a) shows an embodiment in which the present rotation detection device is used, and (b) shows the configuration of the present rotation detection device. As shown in these figures, the present rotation detection device p10 is a rotation detection device p10 for detecting the rotation r of a driven rotor R that rotates due to the rotation q of a driving rotor Q, and is mainly composed of a base body p2 with specifications for mounting to the driven rotor R, a rotation detection means, i.e., a sensor p3, provided on the base body p2, and a signal processing unit p4 that transmits information related to the rotation r of the driven rotor R obtained by the sensor p3 to the outside by a wireless method such as Bluetooth (registered trademark). The mounting position of the present rotation detection device p10 can be preferably the rotation axis of the driven rotor R.

The rotation detection device p10 of the present invention having such a configuration is attached to the driven rotor R by its base p2 when in use, and the sensor p3 provided on the base p2 rotates together with the driven rotor R to obtain information related to the rotation r of the driven rotor R, and this information related to the rotation r is wirelessly transmitted to the outside by the signal processing unit p4. In this way, the rotation r of the driven rotor R, which rotates due to the rotation q of the driving rotor Q, is detected outside the rotation detection device p10. The sensor p3 detects the number of rotations and distinguishes between forward and reverse rotation, and information on the number of rotations and information on the rotation direction can be obtained.
As the sensor p3, an angular velocity sensor can be suitably used, which will be described later.

Figure 1 is a conceptual diagram showing the basic configuration of the rotation detection device of the present invention, which uses a pair of acceleration sensors. The following explanation up to Figure 12-2 is based on the assumption that a pair of acceleration sensors is used as the example of sensor p3 shown in Figure p1. However, other sensors such as the angular velocity sensor mentioned above can also be used as sensor p3 of the present invention as long as they function as rotation detection means, and all of the inventions described in Figures 1 to 12-2 also apply to the use of any sensor that can serve as rotation detection means, including angular velocity sensors, except for explanations that are specifically written as referring to a "pair of acceleration sensors."

In FIG. 1, (a) shows a mode in which the present rotation detection device is used, and (b) shows the configuration of the present rotation detection device. As shown in these figures, the present rotation detection device 10 is a rotation detection device 10 for detecting the rotation r of a driven rotor R that rotates due to the rotation q of a driving rotor Q, and is mainly composed of a base 2 equipped with specifications for attachment to the driven rotor R, a pair of acceleration sensors 3A, 3B integrally provided on the base 2, and a signal processing unit 4 that transmits information related to the rotation r of the driven rotor R obtained by the acceleration sensors 3A, 3B to the outside by a wireless method such as Bluetooth (registered trademark). The attachment position of the present rotation detection device 10 can be preferably the rotation axis of the driven rotor R.

The rotation detection device 10 of the present invention having such a configuration is attached to the driven rotor R by its base 2 for use, and the pair of acceleration sensors 3A, 3B provided on the base 2 rotate together with the driven rotor R to obtain information related to the rotation r of the driven rotor R, which information related to the rotation r is transmitted wirelessly to the outside by the signal processing unit 4. In this way, the rotation r of the driven rotor R, which rotates due to the rotation q of the driving rotor Q, is detected outside the present rotation detection device 10. By using two acceleration sensors (3A, 3B), it is possible to detect the rotation speed and distinguish between forward and reverse rotation, which will be described later with reference to Figures 3 and 4.

Figure 2 is a conceptual diagram showing the case where the rotation detection device of the present invention is used for multiple driven rotors. In the figure, there are two driven rotors, but this is not limited to this and there may be three or more. As shown in the figure, the rotation detection device 10 of the present invention can be attached to each of the multiple driven rotors R1, R2, ... and used to monitor the rotation state between each of the driven rotors R1-R2, etc.

That is, the rotation detection device 10 of the present invention is attached to each of a number of driven rotors R1, R2, ... by a base 2, and each is equipped with a pair of acceleration sensors 3A, 3B to obtain information related to the rotation r1 of the driven rotor R1, information related to the rotation r2 of the driven rotor R2, .... This information related to rotation r1, information related to rotation r2, ... is transmitted wirelessly to the outside by the signal processing unit 4. By using two acceleration sensors (3A, 3B), it becomes possible to detect the rotation speed and distinguish between forward and reverse rotation for each of the driven rotors R1, R2, ....

In this way, the rotation r1 of the driven rotor R1, which rotates due to the rotation q of the driving rotor Q, and the rotation r2 of the driven rotor R2, etc. are detected outside the rotation detection device 10. The rotation q of the single, common driving rotor Q causes rotations r1, r2, etc. in the driven rotors R1, R2, etc., but by obtaining information related to the rotation of each driven rotor externally, it is possible to know any differences or similarities in the rotational state between each driven rotor R1, R2, etc. In other words, it can be used to monitor the rotational state between each driven rotor R1-R2, etc., and is useful for detecting the rotation of the front roller that constitutes a squid fishing machine.

That is, as shown in Figures 14 and 15 above, when the squid fishing machine is operated and driven, the two front rollers, which are the driven rotors, rotate in tandem, but by attaching this rotation detection device 10 to each front roller, it is possible to detect the rotation of each and monitor the difference in rotation and rotation direction. In the case of normal operating conditions where no tangling of the fishing line has occurred, the two front rollers rotate normally, and at this time, the difference in rotation between the two front rollers is small and they rotate in the same forward direction. Therefore, if there is a certain degree of difference in rotation between the two or the rotation directions are different, an abnormality in the rotation state between the two front rollers has occurred, which means that tangling of the fishing line has occurred.

The rotation of each front roller detected by the pair of acceleration sensors 3A and 3B provided per rotation detection device 10 is transmitted to the outside by the signal processing unit 4 via a wireless method such as Bluetooth (registered trademark), and is received by the outside. Based on the rotation detected by the acceleration sensor 3A, etc., information such as the number of rotations, the direction of rotation, etc. is finally obtained, and the presence or absence of an abnormality is judged, and the subsequent measures, i.e., the automatic emergency stop operation of the squid fishing machine is performed.
2-2 is a conceptual diagram showing a case where the rotation detector of the present invention is used in parallel with a plurality of driven rotors. Such a use is also within the scope of the present invention.

FIG. 3 is an explanatory diagram showing a configuration example of a rotation detection device according to the present invention.
FIG. 4 is a graph showing the rotation detection pattern of the angle sensor of the rotation detection device shown in FIG. 3, where (a) shows forward rotation and (b) shows reverse rotation. As shown in FIG. 3, the rotation detection device 110 can be configured such that the major axis/minor axis ratio of the base 12 exceeds 1. In the configuration example shown in the figure, the device is an oblong ellipse, and acceleration sensors 13A and 13B are provided near both poles. In addition, a mounting hole 15 for mounting to the driven rotor is provided in the center. Note that the design specifications can be freely changed according to the application, such as waterproofing when used for mounting the front roller of a squid fishing machine.

When the driven rotor rotates in the forward direction Fw shown in Figure 3, the rotation detection device 110 attached to it also rotates in the forward direction Fw, and the rotation detection pattern at this time is shown in Figure 4 (a). In both graphs (a) and (b), the horizontal axis represents time t and the vertical axis represents acceleration (acceleration value k). As shown in (a), when the rotation detection device 110 and the driven rotor rotate in the forward direction Fw, changes over time occur, such as detection by acceleration sensor 13A, detection by acceleration sensor 13B, detection by acceleration sensor 13A, and so on.

On the other hand, when the rotation detection device 110 and the driven rotor are rotating in the reverse direction Bw, a change over time occurs in which the acceleration sensor 13B detects, then the acceleration sensor 13A detects, then the acceleration sensor 13B detects, and so on. The difference in the pattern of such change over time makes it possible to distinguish between forward and reverse rotation. Furthermore, rotation can be detected based on the output of acceleration (acceleration value k). In this way, by using this device 110, it is possible to obtain detected rotation information from each acceleration sensor 13A, 13B, and rotation direction information by comparing the detection signals.

As shown in the basic configuration in FIG. 1 and the configuration example in FIG. 3, the signal processing unit 4, 14 of the present rotation detection device 10, 110 can be configured to include a processing unit that performs a predetermined calculation process on the detection signal obtained by the acceleration sensor 3A, etc., 13A, etc. to generate the above-mentioned detected rotation speed information and rotation direction information. In the present rotation detection device 10, etc. configured in this way, the processing unit in the signal processing unit 4, etc. performs a predetermined calculation process on the detection signal obtained by the acceleration sensor 3A, etc. to generate detected rotation speed information and rotation direction information, which are then transmitted to the outside. In other words, in this case, the signal processing unit 4 calculates the signal obtained from the acceleration sensor 3A, etc. to generate information on the rotation speed and forward/reverse rotation, and transmits it to the outside via wireless communication means such as Bluetooth (registered trademark).

On the other hand, the signal processing unit 4 of the present rotation detection device 10, etc., can be configured to transmit the detection signal obtained by the acceleration sensor 3A, etc., to the outside as is without performing any special calculation processing on the detection signal, and the above-mentioned detected rotation speed information and rotation direction information can be generated outside the present device 10, etc. When such a configuration is adopted, in the present rotation detection device 10, etc., the signal processing unit 4, etc. transmits the detection signal obtained by the acceleration sensor 3A, etc., to the outside as is, and the above-mentioned detected rotation speed information and rotation direction information are generated by performing a predetermined calculation processing outside the present device 10, etc.

Figure 5 is a conceptual explanatory diagram showing the basic configuration of the rotation detection system of the present invention. As shown in the figure, the rotation detection system 300 of the present invention is mainly configured to include a rotation detection device 10, 10, ... having any of the above-mentioned configurations attached to one or more driven rotors that rotate due to the rotation of a drive rotor, and a receiving device 20 that receives information transmitted from the signal processing units 4, 4, ... of the rotation detection devices 10, 10, ..., and is used to monitor the rotational state between each driven rotor or each driven rotor using detected rotation speed information and rotation direction information. Note that the rotation detection system of the present invention is applicable even if the number of driven rotors and the rotation detection devices attached thereto is one, but the present invention mainly assumes the case of multiple. Therefore, in the following, these will be described as multiple.

According to the present rotation detection system 300 configured as above, in a mechanism in which multiple driven rotors, each with a rotation detection device 10 attached, are connected to a driving rotor, when the multiple driven rotors rotate due to the rotation of the driving rotor, the information on each rotation detected by the angle sensors 3A, 3A, ... of the rotation detection devices 10, 10, ... attached to each driven rotor is wirelessly transmitted from each signal processing unit 4, 4, ... to a receiving device 20 that is outside the device 10, 10, ... and that constitutes the present system 300. As a result, detected rotation speed information and rotation direction information are finally obtained, and the present rotation detection system 300 can be used to monitor the relationship between each driven rotor or the rotation state of each driven rotor.

In the rotation detection system 300 shown in this figure, the signal processing units 4, 4, ... of the rotation detection devices 10, 10, ... can be configured to include a processing unit that performs predetermined calculation processing on the detection signals obtained by the acceleration sensors 3A, etc., 3A, etc., to generate detected rotation speed information and rotation direction information. In this system 300 with such a configuration, the detection signals obtained by the acceleration sensors 3A, etc. are subjected to predetermined calculation processing in the processing unit in the signal processing unit 4, etc., to generate detected rotation speed information and rotation direction information, which are then transmitted to the receiving device 20. On the other hand, as will be described later using Figure 6, the rotation detection system of the present invention is not limited to such a configuration and effects.

The receiving device 20 receives the rotation of each driven rotor detected and transmitted by each rotation detection device 10, 10, ..., but it can also be configured to have a section (component) that performs the function of comparing the received rotation information and determining whether the rotation state of the driven rotor is normal or abnormal, and in addition to this, a section (component) that performs drive control of the driving rotor based on the determined rotation state.

For example, when the system 300 is used to detect the rotation state of the front rollers of a squid fishing machine, the receiving device 20 receives the rotation of each front roller detected and transmitted by each rotation detection device 10, 10, ..., but in addition to the receiving function, it can be configured to have a section that performs the function of comparing the received rotation information of each front roller and determining whether the rotation state is normal or abnormal, and in addition to this, a section that performs emergency stop drive control of the squid fishing machine based on the judgment result of the rotation state. By stopping the squid fishing machine early, it is possible to shorten the recovery time of the squid hook and take safety measures for the crew.

The wireless system used between the signal processing unit 4 of each rotation detection device 10 and the corresponding receiving device 20 can be an appropriate system such as Bluetooth (registered trademark). When multiple driven rotating bodies are wirelessly connected to a common/single driving rotating body, specific usage and specifications such as applying multi-pairing can be designed as appropriate.

Figure 6 is a conceptual explanatory diagram showing another configuration of the rotation detection system of the present invention. As shown in the figure, the rotation detection system 2300 of the present invention comprises rotation detection devices 210, 210, ... each having one of the above-mentioned configurations, which are attached to one or more driven-side rotating bodies that rotate due to the rotation of the driving-side rotating body, and a receiving device 220 that receives information transmitted from the signal processing units 24, 24, ... of the rotation detection devices 210, 210, ..., and the receiving device 220 is further provided with a receiving-side calculation processing unit 226 that generates detected rotation speed information and rotation direction information based on the received detection signal. Note that the number of driven-side rotating bodies and the rotation detection devices attached thereto related to the configuration of the rotation detection system of the present invention may be one, but the present invention mainly assumes the case where there are multiple. Therefore, in the following, these will be described as multiple.

According to the present rotation detection system 2300 having such a configuration, in a mechanism in which multiple driven rotors, each having a rotation detection device 210 attached thereto, are connected to a driving rotor, when the multiple driven rotors rotate due to the rotation of the driving rotor, the information (detection signal) of each rotation detected by the acceleration sensors 23A, etc., 23A, etc., of the rotation detection devices 210, 210, ... attached to each driven rotor is wirelessly transmitted from each signal processing unit 4, 4, ... to a receiving device 220 that is outside the devices 210, 210, ... and that constitutes the present system 2300.

When the receiving device 220 receives the detection signals transmitted from the signal processing units 24, 24, ..., the receiving side calculation processing unit 226 generates detected rotation speed information and rotation direction information based on the signals. In this way, the detected rotation speed information and rotation direction information are obtained, and the present rotation detection system 2300 can be used to monitor the relationship between each driven rotor or the rotation state of each driven rotor.

Figure 7 is a conceptual explanatory diagram showing the configuration of the rotation detection system of the present invention that includes a setting command device. As shown in the figure, in addition to any of the configurations described in Figures 5 and 6, the present rotation detection system 3300 can be configured to include a setting command device 370 that wirelessly transmits settings for communication connection in the receiving device 320 and other setting information to the receiving device 320. As the setting command device, a smartphone or other information terminal device capable of communication can be suitably used.

In the present rotation detection system 3300 configured as described above, various setting information required for using the present system 3300, including settings for communication connection of the receiving device 320, is input to the setting command device 370, and this information is transmitted wirelessly to the receiving device 320, allowing necessary settings such as changing parameter values to be made.

Figure 8 is a conceptual explanatory diagram showing an example of the use of the rotation detection system of the present invention equipped with an emergency stop means for the driving rotor in a squid fishing machine as a configuration example. Note that two front rollers, which are the driven rotors for the squid fishing machine, are provided, but they are omitted in the figure and only one is shown. As shown in the figure, in addition to any of the configurations already described, the present rotation detection system 4300 can be configured to be equipped with an emergency stop means ES that, in a predetermined state, stops the rotation of the driving rotor (the drum of the squid fishing machine SC) DM based on monitoring the rotation state of each driven rotor (front roller) MR, between MRs, or each driven rotor (front roller) MR. Note that transmission from each of the rotation detection device 410 and the setting command device 470 is performed by wireless communication means WL such as Bluetooth (registered trademark).

In the present rotation detection system 4300 having such a configuration, when a predetermined state requiring an emergency stop is detected based on monitoring the rotation state between each driven rotor (front roller) MR, or monitoring the rotation state of each driven rotor (front roller) MR alone, the rotation of the driving rotor (drum of the squid fishing machine SC) DM is stopped by the emergency stop means ES. In other words, when the rotation state of the driven rotor (front roller) MR detected by the rotation detection device 410 is judged to be abnormal, control is performed by the emergency stop means ES. When the present system 4300 is used in a squid fishing machine, a stop action is performed on the internal emergency stop circuit, and the operation of the squid fishing machine can be stopped. In this way, tangling of the fishing line can be discovered early, reducing the time it takes to restore the squid hook and promoting safety measures for the crew in the event of a malfunction.

Figure 9 is a block diagram of the rotation detection system of the present invention illustrated in Figure 8. The emergency stop means ES shown in Figure 8 is positioned as one element constituting the rotation detection system 4300 of the present invention, but as shown in Figure 9, the present invention is not limited to this. In other words, the emergency stop means ES is not one element constituting the rotation detection system 5300 of the present invention, but rather can be understood as an element for drive control of the driving side rotating body that can ultimately be generated by the rotation state monitoring function of the driven side rotating body possessed by the present rotation detection system 5300.

As explained above using the various figures, the rotation detection device 10 and the rotation detection system 300 of the present invention can be suitably used to detect the rotation of the front roller MR that constitutes the squid fishing machine SC, and a squid fishing system (not shown) equipped with such a rotation detection system 300 is also within the scope of the present invention. In the squid fishing system of the present invention, the information received by the receiving device 320 can be configured to be used for motor drive control.

The following is a detailed description of the operation of the present invention when applied to a squid fishing machine (see Figure 17 above). In squid pole-and-line fishing using a squid fishing machine, the left and right front rollers rotate in the same direction and at the same speed unless any of the various problems with tangled fishing line mentioned above and listed as "problems the invention aims to solve" based on the prior art occur.

However, if the squid hook attached to the line on either the left or right front roller becomes entangled with the squid hook attached to the line on the adjacent squid fishing machine, the squid hook on the entangled side will be pulled, and the rotation of the front roller to which it is attached will differ from the rotation of the other front roller due to changes in rotation speed, etc. Such differences in the rotational state between the two front rollers are detected by the rotation detection device or rotation detection system of the present invention. This allows the emergency stop of the squid fishing machine to be quickly activated.

In addition, if a problem occurs in which the fishing line breaks, the weight will fall to the ocean floor as the fishing line breaks, and the load on the front roller to which the fishing line is attached will be removed. This will result in a different rotation speed from the other front roller. The difference in the rotation state between the two front rollers is detected by the rotation detection device or rotation detection system of the present invention. This allows the squid fishing machine to be quickly put into an emergency stop.

In addition, when the reverse winding phenomenon occurs, the rotation direction of the left and right front rollers will be reversed. The difference in the rotation state between the two front rollers is detected by the rotation detection device or rotation detection system of the present invention. This allows the emergency stop of the squid fishing machine to be activated quickly.

Figure 10 is an explanatory diagram showing measures to be taken when using the rotation detection system of the present invention in the case of single drum operation. In the case of single drum operation as shown in Figure 18 above, as shown in Figure 12, the drum from which the squid hook has been removed and the front roller are connected with a connecting means CJ such as fishing line or rubber, and the front roller is rotated as a driven roller, so that both left and right front rollers are rotated as a driven roller in the same way. As a result, even if a malfunction such as tangled fishing line occurs during single drum operation, the difference in the rotation state between the two front rollers is detected by the rotation detection device or rotation detection system of the present invention, and the emergency stop of the squid fishing machine can be quickly activated.

FIG. 11 is a conceptual explanatory diagram showing the configuration of the rotation detection system of the present invention equipped with a driving side operation detection means. The number of driven side rotating bodies exemplified in this figure is not limited. As shown in the figure, the present rotation detection system 6300 can be configured to include a driving side operation detection means 68 that detects the operation of the driving side rotating body Q in addition to any of the configurations explained in each figure. The driving side rotating body Q can be configured to be driven by a motor. In this case, a current sensor that detects the current related to the drive of the motor can be suitably used as the driving side operation detection means 68. The detection information by the driving side operation detection means 68 may be configured to be transmitted to the receiving device 620.
(Note that FIG. 11-2 is a conceptual explanatory diagram showing a configuration of the rotation detection system of the present invention equipped with a drive side operation detection means, in which the system is used in parallel with a plurality of driven side rotors. Although such a configuration is also within the scope of the present invention, the following description will be given of the configuration shown in FIG. 11.)

By providing the drive side operation detection means 68 in the rotation detection system 6300, it is possible to obtain information on the rotation state of the drive side rotor Q, i.e., whether or not it is rotating. Information on the rotation state of the drive side rotor can be configured to be transmitted to the receiving device 620 as shown in the figure, and if the receiving device 620 has a predetermined configuration of arithmetic processing function and drive control function, it is possible to perform subsequent drive control based on the detection of the operating state of the drive side rotor. The advantages of providing the drive side operation detection means will be explained with reference to the following diagram.

Figure 12 is a conceptual explanatory diagram showing an example of the configuration of the squid fishing system of the present invention. As shown in the figure, the squid fishing system 7500 is composed of a rotation detection system 7300 and a squid fishing machine SC. The receiving device (referred to as the "receiving unit" in the figure) 720 and the drive side operation detection means (referred to as the "current detection sensor" in the figure) 78 that constitute the rotation detection system 7300 are provided within the squid fishing machine SC.

The squid fishing machine SC uses a motor MT to drive a drive unit AC, which in turn drives a drum (not shown). The control panel CP is a device that outputs drive control for the motor MT, but also performs control to forcibly stop the drive of the motor MT in response to the operation of the emergency stop means ES if an abnormality in the rotation state of the front roller MR is detected. This emergency stop control is performed via the control panel CP, which is the same as the conventional emergency stop operation method described in Figure 16 above, but the method of detecting an abnormality in the rotation state of the front roller MR differs between the conventional technology and the present invention.

In other words, in the conventional technology, the detection method was that of the hook being activated, which was a considerable delay after the occurrence of tangling in the fishing line, but in the present invention, the abnormality in the rotation state of the front roller MR, which is caused immediately when the fishing line becomes tangled in the sea, is detected by a rotation detection device attached to the front roller MR, and this information is transmitted to the receiving device 720. The reception of the abnormal rotation state information by the receiving device 720 triggers the operation of the emergency stop means ES. Ultimately, this difference in detection method can be said to be the basis of the squid fishing system 7500 of the present invention.

As shown in the figure, the rotation detection system 7300, one of the components that make up the squid fishing system 7500, is composed of a rotation detection device 710 attached to the front roller MR, a receiving device 720, and a setting command device (a "smartphone" is shown as an example in the figure) 770. The rotation detection device 710, the setting command device 770, and the receiving device 720 are connected by wireless communication means WL such as Bluetooth (registered trademark). The drive side operation detection means (a "current detection sensor" in the figure) 78 may be understood as one element of the rotation detection system 7300, or as one element of the squid fishing machine SC.

The advantages of the squid fishing system 7500 configured as described above, particularly with the drive side operation detection means 78, are as follows. By installing a current sensor 78 on the power cable connecting the control panel CP and the motor MT, information on the presence or absence of rotation on the drive side can be obtained, making it possible to judge the following situations:

First, if the current sensor 78 detects that the motor MT (or drive unit AC) is operating but does not detect the rotation of the two front rollers MR, MR, it can detect that the squid hooks that should be on the front rollers MR, MR have become dislodged from the front rollers MR, MR. In this case, the emergency stop means ES can be immediately activated to allow for recovery.

Next, when operation is performed using only one of the drums, abnormalities in the rotation state of the front roller MR can be detected even if the other drum is not connected to the front roller MR by a connecting means such as that shown in Figure 10 above. All that is required is to be able to set the necessary specifications as parameters from the setting command device 770.

And there is an advantage in controlling the operation of the emergency stop means ES. In squid fishing operations using the squid fishing machine SC, there are times when it is necessary to move the fishing line BD to which the squid hook is attached while the motor MT (or the drive unit AC) is not running. For example, this is the case when working to untangle the squid hook. In this case, if the emergency stop means ES is activated during the recovery work, it will be quite inconvenient.

However, by providing a drive side operation detection means 78, if it is detected that the motor MT (or drive unit AC) is not operating, the emergency stop means ES, which detects the rotation of the front roller MR, can be set not to be activated, thereby avoiding such inconvenience.
These advantages obtained by providing the drive side operation detection means can be obtained in applications other than the exemplified squid fishing system.

Further benefits of the rotation detection system of the present invention, which is equipped with the drive side operation detection means described in FIG. 11, will be described with reference to FIG. 12-2. FIG. 12-2 is an explanatory diagram showing a situation in which a problem occurs during squid fishing near the seabed. According to the information detected by the drive side operation detection means (current sensor), if there is no particular change in the drive side rotor (motor) and operation continues, but the rotation of the two front rollers slows down, it can be determined that the squid hook has reached the seabed. This allows the squid fishing machine to be stopped quickly in an emergency, significantly shortening the time required for recovery.

When squid fishing near the seabed during the day, the water depth at which the fishing machine operates can sometimes be set incorrectly. This can be caused by incorrect settings or an error in the automatic water depth setting linked to a fish finder. When this happens, as shown in Figure 12-2, the weights WT and squid hooks ND of all the squid fishing machines SC will land on the seabed ZB and become tangled, and it will take a considerable amount of time to recover. When this happens, the rotation of drums A and B will slow down almost simultaneously. The same is true for drums C and D and drums E and F.

Therefore, as described above, if the two front rollers MR, MR decelerate simultaneously even though there is no change in the detection result of the current sensor that detects the motor operating state of the drive side rotor, it can be determined that the rig ND has reached the seabed ZB. Also, if it is necessary to move the front roller MR to stop the squid fishing machine SC based on the information from the current sensor, the work can be performed smoothly without activating the emergency stop.

Conversely, even if a malfunction occurs such as the driven-side rotating body operating while the driving-side rotating body is not operating, the current sensor (drive-side operation detection means) can be used to detect and determine the malfunction. In this case, the emergency stop means can be configured not to be activated.
The above-mentioned benefits can be obtained in systems other than squid fishing systems.

The following description will be given of an embodiment of the present invention, focusing on a configuration example in which an angular velocity sensor is used as an angle detection means, but the present invention is not limited to such an embodiment. Note that the following description is based on an overview of the development and research process and results of a rotation detection device (rotation detection system) for a squid fishing system.
======================

Development study of the squid fishing machine front roller control unit
1) Purpose In order to realize a device for early detection of fishing line tangle problems in pole-and-line squid fishing, a sensor was attached to a rotating body as part of elemental development, and the following two points were confirmed.
- Confirm that the rotation information of the rotating object can be obtained by a sensor. - Can the rotation information be transferred from the unit attached to the rotating object to an external device via Bluetooth (registered trademark)?
For this experiment, a unit (hereinafter, ESP32 unit) was used in which an Arduino board "ESPr Developer 32" equipped with Bluetooth (registered trademark) was attached to a 9-axis sensor board for expanding this board.
The 9-axis expansion sensor board is equipped with a total of 9-axis sensors: a 3-axis acceleration sensor, a 3-axis angular velocity sensor, and a 3-axis magnetic sensor. In this experiment, data from the 3-axis acceleration sensor and the 3-axis angular velocity sensor were sampled to create waveforms, and the speed and rotation direction detection function was tested from the information from each sensor.

2) Verification using the ESP32 unit The following verification was performed using the ESP32 unit.
Verification 1: Confirming speed and direction of rotation using Cuty 3 The ESP32 unit is fixed to the flywheel attached to the Cuty 3 motor, and the raw data of the acceleration/angular velocity sensors is confirmed under conditions with no external disturbances other than rotation, to confirm the speed/direction of rotation detection function.
Verification 2: Checking the speed and direction of rotation when attached to the front roller Using a squid fishing machine and a load tester, the ESP32 unit was embedded in the front roller, and the raw data of the angular velocity sensor was checked under conditions closer to those of an actual squid fishing machine, and the speed/direction of rotation detection function was confirmed.
Verification 3: Confirmation of Bluetooth (registered trademark) communication In verifications 1 and 2, an ESP32 unit is attached to a rotating body, and confirmation is made as to whether Bluetooth (registered trademark) communication can be maintained while the body is rotating.

3) Verification results Verification 1: Confirmation of speed and rotation direction using Cuty3 - Angular velocity sensor By observing the angular velocity waveform during rotation from 0 to 400 rpm, it was confirmed that the speed/rotation direction could be detected with only a single-axis sensor. The value of the acquired angular velocity information is the speed, and the sign is the rotation direction. It was possible to easily calculate the speed/rotation information from the angular velocity data. The simplicity of the sensor configuration and ease of calculation were confirmed in a comparison with the acceleration sensor described below.

・Acceleration sensor By observing the acceleration waveform during rotation from 0 to 400 rpm, it was confirmed that the speed/rotation direction could be detected. Note that an angular velocity sensor is considered to have an advantage in that it does not require two or more axes as a sensor configuration, it is easy to calculate the speed without the need to calculate it from the frequency, and there is no effect from the sampling period of the acceleration data.

Verification 2: Confirmation of speed and rotation direction when attached to the front roller In the angular velocity sensor test in this verification, it was confirmed that it can track the speed of the front roller even during acceleration and deceleration due to jerking. This could be easily confirmed from the waveform. In addition, by observing the angular velocity waveform during rotation from 0 to 400 rpm, it was confirmed that the speed/rotation direction can be detected with a single-axis sensor. Furthermore, it was confirmed that it is not easily affected by vibration components, and that depending on the installation direction, it is possible to use the angular velocity data as it is without processing it.

Verification 3: Checking Bluetooth (registered trademark) communication
In the above tests 1 and 2, it was confirmed that the Bluetooth (registered trademark) communication was not interrupted midway and the communication was maintained.

4) Summary It was confirmed that an angular velocity sensor, which is easy to detect the speed/rotation speed, is one of the suitable angle detection means for detecting the behavior of the front roller in the squid fishing system. In addition, even when a Bluetooth device was attached to a rotating object such as the front roller, Bluetooth communication was not interrupted.

5) Supplementary Note: We have further considered how to detect speed/rotation direction using an acceleration sensor.
Fig. 19 is an explanatory diagram showing an example of acceleration sensor installation. The speed is obtained by calculating the frequency from the acceleration data acquired from the acceleration sensor installed in the rotation direction, but data for two axes is required to detect the rotation direction. As shown in the figure, two-axis acceleration sensors are installed with a 90° shift from the center of rotation as a reference, and the rotation direction can be detected by comparing the acceleration data of both. Note that when two axes are arranged in the centrifugal direction, an offset in centrifugal acceleration occurs, but the offset amount can be calculated from the speed and the sensor installation position.
(FIG. 20 is an explanatory diagram showing an example of mounting an angular velocity sensor, shown for comparison with the above-mentioned example of mounting an acceleration sensor.)

The rotation detection device and rotation detection system of the present invention make it possible to detect tangling of fishing line in the sea at an early stage during squid fishing operations using a squid fishing machine, reducing the time and effort required to recover the squid hook and allowing safe operations for the crew. Furthermore, the present invention is not limited to technology for early detection of problems when using a squid fishing machine, but is useful in all devices and systems where it is useful to directly detect the rotation of the driven rotor, and in the industrial fields to which they are related, making it an invention with high industrial applicability. The rotation detection system of the present invention is particularly useful in all environments and situations where it is not suitable to use cables to attach each sensor.

p2...base p3...acceleration sensor p4...signal processing unit p10...rotation detection device 2, 12, 22, 32, 42...base 3A, 3B, 13A, 13B, 23A, 23B, 33A, 33B, 43A, 43B...acceleration sensor 4, 14, 24, 34, 44...signal processing unit 10, 110, 210, 310, 410, 610, 710...rotation detection device 15, 45...mounting holes 20, 220, 320, 420, 620, 720...receiving device 226...receiving side calculation processing unit 68, 78...drive side operation detection means (current sensor)
300, 2300, 3300, 4300, 5300, 6300, 7300...Rotation detection system 370, 470, 770...Setting command device 7500...Squid fishing system AC...Drive unit BD...Line Bw...Reverse direction CJ...Connecting means CP...Control panel DM...Squid fishing machine drum ES...Emergency stop means Fw...Normal direction HK...Hook MR...Follower side rotating body (front roller)
MT…Motor ND…Squid hook (rig)
Q: driving rotor q: rotation of driving rotor Q R, R1, R2: driven rotor r, r1, r2: rotation of driven rotor R SC: squid fishing machine WL: wireless communication means (Bluetooth (registered trademark), etc.)
WT…weight
X: rotation axis of driven rotor R ZB: seabed

Claims (12)

A rotation detection device for detecting rotation of a driven-side rotating body that rotates due to rotation of a driving-side rotating body,
A base body having a specification for being attached to the driven rotating body;
A rotation detection means or sensor provided on the substrate;
and a signal processing unit that wirelessly transmits information relating to the rotation of the driven rotor obtained by the sensor to an outside. The rotation detection device according to claim 1, characterized in that the sensor obtains rotation speed information and rotation direction information. The rotation detection device according to claim 2, characterized in that the signal processing unit includes a calculation processing unit that performs a predetermined calculation process on the detection signal obtained by the sensor to generate the rotation speed information and rotation direction information. The rotation detection device according to claim 2, characterized in that the signal processing unit transmits the detection signal obtained by the sensor to the outside, and the rotation speed information and rotation direction information are generated outside the device. The rotation detection device according to claim 2, which is attached to each of a plurality of driven rotors and is used to monitor the rotation state between each of the driven rotors. The rotation detection device according to claim 5, characterized in that it is used to detect the rotation of the front roller that constitutes a squid fishing machine. The rotation detection device according to any one of claims 1, 2, 3, 4, 5, and 6, characterized in that the sensor is an angular velocity sensor. a rotation detection device according to claim 2 attached to one or more driven rotors which rotate in response to rotation of a drive rotor;
a receiving device for receiving information transmitted from a signal processing unit of the rotation detection device,
A rotation detection system characterized in that it is used for monitoring the rotational state between each driven rotor or each driven rotor based on detected rotation speed information and rotation direction information. The rotation detection system according to claim 8, further comprising a setting command device that wirelessly transmits settings for communication connection in the receiving device and other setting information to the receiving device. The rotation detection system according to claim 8 or 9, characterized in that it is provided with an emergency stop means for stopping the rotation of the driving side rotor in a predetermined state based on monitoring the rotation state between the driven rotors or of each driven rotor. The rotation detection system according to claim 10, further comprising a drive side operation detection means for detecting the operation of the drive side rotating body. The rotation detection system according to claim 8 or 9, which is used for detecting the rotation of a front roller constituting a squid fishing machine.