JPS6045815B2 - Fishing net break detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detector that promptly notifies the inside of a ship when a fishing net is broken.

Fishing nets can be damaged due to seabed conditions, rocks, and other obstacles. For example, even if localized damage occurs, if it is not detected quickly and reliably and appropriate measures are taken, the damage may expand and cause the fishing net to break. It may cause washing away etc.

However, since the detectors used to detect this are affected by changes in water pressure due to differences in underwater conditions and water depth during operations, they must operate accurately and must be easy to handle. The present invention provides an improved detector that is not affected by water pressure, operates accurately and easily, and is easy to reset and handle. The switch tube 4, which has chambers 3 formed at both ends of the main tube 2, and the cover tube 5 are screwed together to form an integral body. Made of magnetic material.

The inside of the main cylinder 2 is divided into a large diameter part 7 and a small diameter part 8 by a stepped part 6, and water holes 32 are provided in the peripheral wall of the large diameter part 7 at both ends and in the middle thereof.

The plunger 1 is slidably supported by the small diameter part 8 and inside the large diameter part 7, and has a stepped part 9 that engages with the stepped part 6 of the main cylinder 2.
A magnet 11 is fixed to the head 10. A slotted hole 12 in the radial direction and a long hole 13 in the axis J direction communicating with the slotted hole 12 via an inclined surface a are bored near the head of the plunger 1, and a ball 14 inserted into the slotted hole 12 is formed. The ball 15 is supported by a ball 15 inserted into the slotted hole 13, and the ball 15 is press-supported by an adjusting screw shaft 17 having a connecting hole 16 screwed into the slotted hole 13 via a spiral spring 18. 14 to i outside.

The cover tube 5 covering the adjustment screw shaft 17 is provided with an operation hole 19 for operating the adjustment screw shaft 17 from the outside at night, and a detection string introduction hole 21 for tying the detection string 20 to the connection hole 16. The tip of the switch tube 4 screwed into the main tube 2 is closed with a wall 22 to form a chamber 3. The wall 22 faces the magnet 11 of the plunger 1, and the chamber 3 is normally open and magnetic The interior of the chamber 3 is sealed by a rubber backing 25 and a tightening gland 26, which are fitted onto a cable 24 connected to the reed switch, and which are fitted into the switch tube 4. 4 and the cover tube 5 are provided with handles 27, 27, and a fixing nut 28 is screwed onto the adjusting screw shaft 17.

As shown in FIG. 1, the detector A of the present invention configured as described above is constructed by tying the fishing net 29 at an appropriate position using the handles 27, 27, and inserting the detection string 20 into the cover tube 5 through the introduction hole 21. The required number of branch strings 31 branched from the detection string 20 are inserted into the connecting hole 16 of the adjustment screw shaft 17 and tied, and the required number of branch strings 31 branched from the detection string 20 are placed in appropriate positions on the fishing net 29 to the extent that almost no tension is applied to the branch strings during operation. Once tied, the cable 24 is connected to a transmitting device or a receiving device on board, and the plunger 1 is positioned to the left as shown in FIG.

In this state, the magnet 11 approaches the wall 22 of the switch tube 4, and the reed switch 23 is closed by the action of the magnet, and the guide hole 12 is closed.
is located in the large diameter portion 7, so the ball 14 is located in the helical spring 18.
The ball 15 is pushed outward and engages the stepped portion 6 to prevent the plunger from moving. If a part of the fishing net is damaged during operation in such a state, tension is applied to the branched string 31 connected to the rear of the broken part, and when this tension reaches a preset tension or more, the spiral spring 18, The ball 14 supported by the ball 15 and engaged with the stepped portion 6 is pushed into the guide hole 12, and the plunger 1 slides to a position where the stepped portion 9 engages with the stepped portion 6 of the main cylinder 2, and the magnet 11 is connected to the lead. Since it is far away from the switch 23, the switch is opened and a notification is sent to a recording device or an alarm device in the ship via the cable 24 directly or via a transmitting device or the like. Plunger 1 mentioned above
The tension at which the fishing net operates varies depending on the fishing speed of the fishing net, the tidal current, and other operating conditions. Adjust to suit operating conditions.

In addition, when the broken net is detected as described above and the sliding plunger 1 moves the adjusting screw shaft 17 back with the fingertip inserted through the operation hole 19 and the guiding hole 12 moves to the large diameter portion 7, the plunger 1 is moved by the spiral spring 18. The pressed ball 15 pushes out the ball 14, which engages the stepped portion 6 to hold the plunger 1 in an activated state. Due to this movement of the plunger 1, the seawater in front of the head 10 is discharged from the middle and left water holes 32 in the figure, and the main cylinder is formed between the step 6 of the main cylinder 2 and the step 9 of the plunger 1. Seawater is sucked into the gap between the diameter portion 7 and the plunger 1 through the water passage hole 32 on the right side. As described above, in the present invention, the reed switch 23 is housed in a sealed chamber and is actuated by the magnet 11 on the plunger head through the wall 22, so that it is accurately actuated by the movement of the plunger without being affected by water pressure or other external influences. .

Further, in the plunger 1, a ball 14 moving in the radial direction is pressed and supported by a ball 15 that is pushed laterally by a spiral spring 18, and the ball 14 is pushed into the hole by the tension of the broken fishing net when it engages with the step 6 of the main cylinder. After being immersed into the main cylinder 12, there is only a slight frictional resistance between the small diameter part 8 of the main cylinder 2 and the plunger. Since water is sucked and discharged from the intermediate water passage hole 32, it slides easily. That is, since the tension acts in a direction transverse to the direction in which the ball 14 is immersed, a relatively large tension is required to cause the ball 14 to immerse;
After the plunger 4 is immersed in the guide hole 12, the plunger can be slid with a very small tension. For example, when the tension for immersing the ball 14 is set to 20k9, the plunger with the hole 14 immersed in the guide hole 12 will slide at about 1 to 2k9, so detection and resetting by the plunger are performed smoothly and easily, and handling is extremely simple. It is easy to use, the plunger has a long sliding distance, eliminates malfunction of the switch, and when throwing in a fishing net, it is easy to identify its position from the operation hole 19 and confirm that it is adjusted to the proper state of use. It has many advantages in use in the field, such as in the event that the cable 2-m reed switch 23 or the like is damaged or defective, it is sufficient to simply replace the switch tube 4.

[Brief explanation of the drawing]

The drawings show the mode of carrying out the present invention. Fig. 1 is a schematic diagram of the state in use, Figs. 2 and 3 are longitudinal sectional views of the detector, and Fig. 2 is the state before detection of a broken net, and Fig. 3 indicates the state after a broken net is detected. 1...Plunger, 2...Main cylinder, 4.
... Switch tube, 6 ... Stepped part, 10 ...
... Head, 11 ... Magnet, 12 ... Guide hole, 13 ... Long hole, 14, 15 ... Ball, 17 ...・Adjustment screw shaft, 18... Spiral spring, 20... Detection string, 22... Wall, 2
3... Reed switch, 31... Branch cord.

Claims (1)

[Claims] 1 A plunger having a head to which a magnet is fixed is provided with a radial guide hole and an axial long groove communicating with the guide hole, an adjusting screw shaft is screwed into the long groove, and the plunger is supported by the adjusting screw shaft. The ball in the long hole that is pressed by the spiral spring is brought into contact with another ball housed in the guide groove, and the ball in the guide hole is supported so as to be pushed outward, and the ball is pushed out from the guide hole. The plunger is slidably inserted into the main cylinder so that the ball is held between the stepped part formed on the inner periphery of the main cylinder and the plunger head, and the switch cylinder, which seals and houses a switch controlled by magnetic force, is inserted into the main cylinder. At the position where the plunger is stopped when the ball in the guide hole engages with the stepped part, the magnetic force of the magnet in the plunger head activates the switch, and the detection string connected to the adjustment screw shaft or its branch. A fishing net break detector characterized in that the tension of the broken net applied to the string pushes the ball that engages the step into the guide hole, slides the plunger, activates the switch, and remotely reports the break of the fishing net. .