CN201600114U - Trawling angle measuring device of midwater trawl warp - Google Patents

Abstract

A trawling angle measuring device of a midwater trawl warp relates to a trawling measuring device, comprises a protractor and a pointer and is characterized in that the protractor is fixed among three clamping plates, namely one of the clamping plates is positioned on the back side of the protractor and two of the clamping plates are positioned on the front side of the protractor; the a position of the outer clamping plate positioned on the front side corresponding to scales of the protractor is provided with an arc-shaped slot; the same positions of four corners of the three clamping plates are provided with circular holes of the same size for fixing the protractor; set screws are installed in the circular holes at the four corners; the three clamping plates and the protractor are provided with pointer installation holes according to the position of the center of a circle of the scales of the protractor; the pointer is mounted on the outside of the outer clamping plate positioned on the front side of the protractor; the upper portion of the pointer is provided with a circular installation hole and a pin and disposed inside the pointer installation holes of the three clamping plates and the protractor; the lower portion of the pointer is provided with a pencil insertion hole; and the distance from the center of the circular installation hole on the upper portion of the pointer to the center of the pencil insertion hole on the lower portion of the pointer is equal to the arc radius of the scales of the protractor.

Description

A kind of middle layer trawl drags guiding principle towing angle measuring appliance

Technical field

The utility model relates to the measuring appliance that the sea fishery trawling is used.

Background technology

Middle layer trawl is the mode of mainly fishing for of China's trawl-net fishing, divides single ship and two two kinds of operating types of ship, and main fishes for liking pelagic fishes or siphonopods.Trawlnet generally requires towing speed about 3.5～4.0kn.After fish detector detected fish school trace, trawlnet should aim at shoal of fish towing.Whether the towing degree of depth of trawlnet or net position directly influence the fishery harvesting effect with shoal of fish level.

Net position-finding to middle layer trawl at present mainly contains netsonde mensuration and his ship auxiliary measuring dual mode.It is by at web plate or each main position sensor installation of netting gear that netsonde is measured, and characterizes the towing degree of depth of netting gear apart from the vertical range of the water surface by the transmitted wave determination sensor.The netsonde device is mainly by foreign-made, and the netsonde measurement has accurate, real-time advantage, and shortcoming is that cost is higher, and as the SCANMAR wireless type trawl monitor of Norway, a complete set of price is about about 400,000 dollars.In addition, the trawlnet that sensor is housed is had relatively high expectations to working the operation of putting net, to avoid the damage of sensor.The mode of his ship subsidiary is in normal towing process, by his ship process trawlnet top, utilizes fish finder to measure the depth of implements of netting gear.Utilize other ships to come subsidiary net position, though cost is relatively low, practical operation is trouble, and precision is not high, can't guarantee that position that fish finder is surveyed is the headline or the network interface position of netting gear.

In China, except that the middle layer trawl in coastal waters, some ocean or the large-scale phantom trawler of mistake ocean property., except that above-mentioned dual mode, still rely on the captain greatly and utilize experience to estimate the net position for the net position-finding of trawlnet.At present, go back simple, effective, the cheap trawlnet net position measuring appliance of neither one.

The utility model content

The purpose of this utility model provides a kind of trawlnet and drags guiding principle towing angle measuring appliance, utilizes the angle that records, and then can obtain the towing degree of depth of trawlnet by data reduction.

The technical solution of the utility model adopts protractor, pointer, it is characterized in that protractor is fixed between three clamping plate, clamping plate are arranged at the protractor back side exactly, there is two clamping plates in the front, the position that its positive outer field clamping plate are corresponding with the protractor scale mark is shaped on the slotted eye of circular arc, the identical bits that three clamping plate are four jiaos is equipped with the circular hole that the identical fixed amount hornwork of size is used, and in four jiaos circular hole equipped fixed screw, three clamping plate and protractor are shaped on the pointer mounting hole according to the home position of protractor scale mark; Pointer is contained in the positive outer laminated plank outside, there is the circular mounting hole on pointer top and assembles in the pointer mounting hole that bearing pin is contained in above-mentioned three clamping plate and protractor, the pencil jack is arranged at the pointer bottom, and pointer upper circular mounting hole and bottom pencil jack centre distance equal the arc radius of protractor scale mark.

The utility model is in actual measurement, the measuring appliance that assembles is contained in drags on the guiding principle, according to the protractor reading of pointer indication, can be in the hope of draging the towing degree of depth of guiding principle through mathematical computations near netting gear one end, its advantage be simple to operate, measure effectively, manufacturing cost is cheap.

Description of drawings

Fig. 1 is a protractor; Fig. 2, Fig. 3 are clamping plate; Fig. 4 is the clamping plate that are shaped on arc-shaped slot; Fig. 5 is a pointer; Fig. 6 is a measuring appliance; Fig. 7 is an instrumentation plan.

Embodiment

Draging guiding principle towing angle measuring appliance adopts protractor, rigid plastic clamping plate, pointer combinatorial surface to become.Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 are protractor part broken away view.The length of protractor A is L among Fig. 1, highly is H, L=50cm, H=35cm; Length, the width with Fig. 1 protractor A is identical respectively for the length of Fig. 2, Fig. 3, Fig. 4 three clamping plate B, C, D, width dimensions, i.e. L=L1=L2=L3, H=H1=H2=H3.Protractor scale mark place home position has pointer mounting hole a, and the diameter of mounting hole a is 0.8cm; The same position of three clamping plate B, C, D has size three circular hole b, cs, the d identical with pointer mounting hole a.In addition, the Si Jiaochu of three clamping plate has position, big or small identical circular hole, and four jiaos of place's Circularhole diameters of three clamping plate are 1cm; Be used for fixing clamping plate and protractor.

The outer field clamping plate D in front shown in Figure 4 has arc-shaped slot e, 5～175 ° of the circular arc scopes of slotted eye e, and the width of slotted eye e is 5cm, the arc point midway is identical with protractor scale mark point midway.

The pointer mounting hole is arranged at pointer top shown in Figure 5, and the bottom has size to be the circular hole of conventional pencil diameter of section.The distance of center circle of the mounting hole on pointer top and bottom circular hole equals the radius of protractor A scale mark place circular arc from L4, and the scale mark radius of circle of protractor is 18cm, and pointer is contained in the clamping plate D outside.

In the actual measurement shown in Figure 7, the measuring appliance that assembles is contained in drags on the guiding principle, because fishing boat has certain rocking in the actual measurement, so reading scope often, minimum and maximum angle is decided to be α, β respectively.According to the protractor reading, the terminal degree of depth of then draging the close netting gear of guiding principle can calculate by following formula:

$D=S\×\cos \frac{\mathrm{\α}+\mathrm{\β}}{2}-s$

In the formula: D is a degree of depth (unit: m);

S is for draging guiding principle towpoint and netting gear junction length (unit: m);

S drags the vertical height (unit: m) of guiding principle towpoint apart from the water surface.

α be measure maximum angle (unit: degree);

β be measure minimum angles (unit: degree).

Claims (2)

1. a middle layer trawl drags guiding principle towing angle measuring appliance, adopt protractor, pointer, it is characterized in that protractor is fixed between three clamping plate, clamping plate are arranged at the protractor back side exactly, there is two clamping plates in the front, the position that its positive outer field clamping plate are corresponding with the protractor scale mark is shaped on the slotted eye of circular arc, the identical bits that three clamping plate are four jiaos is equipped with the circular hole that the identical fixed amount hornwork of size is used, and in four jiaos circular hole equipped fixed screw, three clamping plate and protractor are shaped on the pointer mounting hole according to the home position of protractor scale mark; Pointer is contained in the positive outer laminated plank outside, there is the circular mounting hole on pointer top and assembles in the pointer mounting hole that bearing pin is contained in above-mentioned three clamping plate and protractor, the pencil jack is arranged at the pointer bottom, and pointer upper circular mounting hole and bottom pencil jack centre distance equal the arc radius of protractor scale mark.

2. a kind of middle layer trawl according to claim 1 drags guiding principle towing angle measuring appliance, it is characterized in that 5～175 ° of the circular arc scopes of the arc-shaped slot of the positive outer field clamping plate of protractor, and the width of slotted eye is 5cm.

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