CN212255715U - Fishing boat identity recognition device based on big dipper location - Google Patents

Abstract

The utility model provides a fishing boat identity recognition device based on big dipper location, including big dipper location module, AIS radio frequency module and ARM minimum system, still include a base, the base upper surface has set gradually first backup pad, second backup pad and third backup pad from bottom to top, just first backup pad, second backup pad and third backup pad are the echelonment setting, be provided with the lithium cell in the base, be provided with the solar panel that is used for charging for the lithium cell on the third backup pad, be provided with the MCU that is used for the lithium cell to supply power on the third backup pad, be provided with the antenna on the third backup pad, and the MCU sets up in the antenna left side; the base is provided with a transparent cover body, the lower end of the peripheral side wall of the transparent cover body is provided with a plurality of buckling pieces at equal intervals, and the lower surface of the base is provided with a flange plate; the utility model discloses simple structure, the simple operation can realize the control effect to the fishing boat.

Description

Fishing boat identity recognition device based on big dipper location

Technical Field

The utility model relates to a fishing boat supervisory equipment technical field, especially a fishing boat identification device based on big dipper location.

Background

In recent years, an Automatic Identification System (AIS) of a ship is widely popularized in the field of seagoing, the AIS is a broadcast communication System working in a maritime frequency band (162 MHz), ship names, unique Identification codes, types, sizes and motion information are modulated into AIS messages, an ad-hoc network time division multiple access mode is adopted for broadcasting outwards, so that information interaction among AIS devices is realized, a safety rescue information System of a marine fishing boat is started in 2008 in Zhejiang province, the monitoring of the fishing boat is realized by applying an AIS technology, and the whole System comprises 30 monitoring center platforms in 3 grades, 20 Automatic Identification collision avoidance System AIS base stations, AIS shipborne terminal devices, satellite monitoring and communication shipborne terminal devices and the like. Aiming at the problem that a small fishing boat is difficult to be equipped with large AIS equipment and potential safety hazards such as ship collision are prominent, a portable AIS small fishing boat rescue system is designed and developed by taking a mobile phone as a carrier and combining an AIS technology, a Beidou positioning technology, a 4G communication technology and the like so as to solve the safety problem of the current small fishing boat; however, the AIS technology is originally directed to commercial ships, the main promotion objects are cargo ships and passenger ships with the weight of more than 300 tons, corresponding optimization is not performed on small fishing ships, and although the AIS technology does not charge any communication cost and has the ship collision avoidance function, the AIS technology has the defects of large terminal volume, high energy consumption and strong power supply dependence; the small fishing boat (below 60 horsepower) has a simple structure, usually has no independent power supply, only depends on a shipborne power device for power supply, has very unstable power, has no installation space and power supply of standard AIS equipment, and can not adapt to the AIS equipment on the market at present.

In conclusion, fishing boat monitoring is a subject of general attention at home and abroad, foreign countries have high technical standards of fishing boats for water operation, the proportion of small fishing boats below 60 horsepower is very small, the fishing boats mainly adopt medium and large fishing boats for ocean fishing, the fishing boat positioning and monitoring facilities are complete, the fishery production informatization and safety level is high, and the fishing boats are limited by the economic development level, and the small fishing boats below 60 horsepower are one of main boat types for fishermen in offshore fishery production in China, have extremely large quantity, are influenced by cost control and power shortage, and have no available positioning and monitoring equipment.

Disclosure of Invention

In view of this, the utility model aims at providing a can realize the fishing boat identification device of control to small-size fishing boat based on low cost, low-power consumption, non-maintaining of big dipper AIS technique.

The utility model discloses a following method realizes: the utility model provides a fishing boat identity recognition device based on big dipper location, includes big dipper orientation module, AIS radio frequency module and ARM minimum system, its characterized in that: the solar battery charging device is characterized by further comprising a base, wherein a first supporting plate, a second supporting plate and a third supporting plate are sequentially arranged on the upper surface of the base from bottom to top, the first supporting plate, the second supporting plate and the third supporting plate are arranged in a step shape, a lithium battery is arranged in the base, a solar panel used for charging the lithium battery is arranged on the third supporting plate, an MCU used for supplying power with the lithium battery is arranged on the third supporting plate, an antenna is arranged on the third supporting plate, and the MCU is arranged on the left side of the antenna; the base is provided with a transparent cover body, the lower end of the peripheral side wall of the transparent cover body is provided with a plurality of buckling pieces at equal intervals, and the lower surface of the base is provided with a flange plate; the MCU is connected with the Beidou positioning module, the AIS radio frequency module, the ARM minimum system and a charging and discharging circuit.

Furthermore, the buckling piece comprises an L-shaped plate, the lower end of the peripheral side wall of the transparent cover body is provided with a ring-shaped plate matched with the first supporting plate, the ring-shaped plate is arranged on the outer side of the second supporting plate, the ring-shaped plate is equidistantly provided with a plurality of L-shaped plates, a limiting groove is formed in the lower surface of the transverse plate of each L-shaped plate, limiting columns matched with the limiting grooves are equidistantly arranged on the upper surface of the first supporting plate, and the limiting columns are arranged on the outer side of the second supporting plate.

Further, the lithium cell does through the charge-discharge circuit MCU supplies power, MCU warp AIS radio frequency module's voltage controlled oscillator and driver amplifier communicate with band pass filter, band pass filter carries data to impedance matching network in through power amplifier's effect, MCU stores received data through ARM minimum system, and rethread MCU carries signal transmission to LED status indication for the LED lamp of fishing boat carries out status indication.

Further, the Beidou positioning module comprises a Beidou positioning chip, a capacitor C3, a resistor R11, a resistor R12, a resistor R13, a capacitor C4, a live wire L1, a capacitor C5, a resistor R14, a VCC-3V3D port and an AIS radio frequency device RF1, the TXD pin of the Beidou positioning chip is connected with the MCU through a GPS-RXD lead, the RXD pin of the Beidou positioning chip is connected with the MCU through a GPS-TXD lead, one end of the resistor R11 is connected with the GPS-RXD conductor, one end of the resistor R12 is connected with the GPS-TXD conductor, the other end of the resistor R11 is connected with the other end of the resistor R12 in series and then is connected with the VCC-3V3D port, a VBACK pin and a VCC pin of the Beidou positioning chip are connected in series and then connected with one end of the capacitor C3, one end of the capacitor C3 is connected with the VCC-3V3D port, and the other end of the capacitor C3 is grounded; the VDDSUSB pin of the Beidou positioning chip is grounded, the TIMEPULSE pin of the Beidou positioning chip is connected with one end of the resistor R13, the other end of the resistor R13 is connected with one end of a GPS-1PPS lead, the other end of the GPS-1PPS lead is connected with the MCU, the No. 8 pin of the Beidou positioning chip is connected with one end of the capacitor C4 in series and then is connected with the No. 9 pin of the Beidou positioning chip, the other end of the capacitor C4 is grounded, a No. 9 pin of the Beidou positioning chip is connected with one end of the live wire L1, the other end of the live wire L1 is connected with a No. 11 pin of the Beidou positioning chip, the No. 11 pin of the Beidou positioning chip is connected with one end of the capacitor C5 in series and then is connected with one end of the resistor R14, the other end of the capacitor C5 is grounded, the other end of the resistor R14 is connected with the pin No. 1 of the AIS radio frequency device RF1, and the pin No. 2 of the AIS radio frequency device RF1 is grounded.

Further, the protective device comprises a protective shell, the upper surface of the protective shell is open, an electric telescopic cylinder is arranged on the inner lower surface of the protective shell, a supporting base is arranged on the telescopic end of the electric telescopic cylinder, the flange plate is fixed on the supporting base through a plurality of fixing nuts, a plurality of T-shaped slide rails are arranged on the inner peripheral side wall of the protective shell, T-shaped convex parts which are embedded in the T-shaped slide rails and matched with the T-shaped slide rails are arranged on the side surface of the supporting base, the T-shaped slide rails are arranged above the electric telescopic cylinder, arc-shaped partition plates which incline downwards are arranged between the inner left side surface and the inner right side surface of the protective shell and the electric telescopic cylinder, water outlets matched with the arc-shaped partition plates are arranged at the left end and the right end of the peripheral side wall of the protective shell, the electric telescopic cylinder is electrically connected with the MCU.

Furthermore, the peripheral side wall of the telescopic end of the electric telescopic cylinder is provided with a telescopic protective sleeve.

Furthermore, the upper surface of the flange plate is arc-shaped with a downward opening.

The beneficial effects of the utility model reside in that: the utility model discloses an add base and transparent lid in the device for can be through the base to solar panel and lithium cell support effect, can carry out waterproof effect to solar panel, MCU and antenna through the effect of transparent lid, make this device can realize based on the low cost of big dipper orientation module and AIS radio frequency module, low-power consumption, non-maintaining effect, establish the small-size fishing boat monitoring system based on AIS communication; the flange is added in the device and can be connected with the protection shell under the action of the flange, and the device can be effectively prevented from water under the protection action of the protection shell, so that the service life of the device is prolonged; the utility model discloses simple structure, the simple operation can carry out the monitoring effect to small-size fishing boat through big dipper orientation module, and the follow-up management of being convenient for improves information feedback efficiency.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the assembly and disassembly of the present invention.

Fig. 3 is a schematic structural diagram of the protective housing.

Fig. 4 is a block diagram of the circuit structure of the present invention.

Fig. 5 is a schematic circuit diagram of the present invention.

FIG. 6 is a circuit schematic diagram of the Beidou positioning module.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1 to 4, the present invention provides an embodiment: a fishing boat identity recognition device based on Beidou positioning comprises a Beidou positioning module, an AIS radio frequency module, an ARM minimum system and a base 1, wherein a first supporting plate 11, a second supporting plate 12 and a third supporting plate 13 are sequentially arranged on the upper surface of the base 1 from bottom to top, the first supporting plate 11, the second supporting plate 12 and the third supporting plate 13 are arranged in a step shape, a lithium battery (not shown) is arranged in the base 1, a solar panel 14 used for charging the lithium battery is arranged on the third supporting plate 13, an MCU15 used for supplying power to the lithium battery is arranged on the third supporting plate 13, an antenna 16 is arranged on the third supporting plate 13, and the MCU15 is arranged on the left side of the antenna 16; the base 1 is provided with a transparent cover body 2, the lower end of the peripheral side wall of the transparent cover body 2 is provided with a plurality of fasteners 21 at equal intervals, and the lower surface of the base 1 is provided with a flange 3; the MCU15 is connected with the Beidou positioning module, the AIS radio frequency module, the ARM minimum system and a charging and discharging circuit. On the basis of the AIS standard, a Beidou satellite receiving module is used as a positioning source to replace the AIS original GPS positioning, and meanwhile, a system with a short message communication function is added; and acquiring positioning information through a Beidou positioning module, and broadcasting information such as the position, the navigational speed and the course of the fishing boat to an AIS shore-based base station through a standard AIS message.

Referring to fig. 1 and 2, in an embodiment of the present invention, the fastening member 21 includes an L-shaped plate 22, a ring plate 17 is disposed at a lower end of a peripheral side wall of the transparent cover 2 and is matched with the first supporting plate 11, the ring plate 17 is disposed at an outer side of the second supporting plate 12, a plurality of L-shaped plates 22 are disposed at equal intervals on the ring plate 17, a limiting groove 23 is disposed on a lower surface of a transverse plate of the L-shaped plate 22, limiting posts 24 matched with the limiting groove 23 are disposed at equal intervals on an upper surface of the first supporting plate 11, and the limiting posts 24 are disposed at an outer side of the second supporting plate 12. So that the transparent cover body 2 can be better covered on the base 1 through the matching of the limiting groove 23 and the limiting column 24.

Please refer to fig. 5, in an embodiment of the present invention, the lithium battery is supplied with power through the charging and discharging circuit, the MCU is through the voltage controlled oscillator and the driving amplifier of the AIS radio frequency module communicate with the band pass filter, the band pass filter transmits data to the impedance matching network through the power amplifier, the MCU stores the received data through the ARM minimum system, and the MCU transmits signals to the LED status indicator, so that the LED lamp of the fishing boat performs status indication.

Referring to fig. 6, in an embodiment of the present invention, the big dipper positioning module includes a big dipper positioning chip, a capacitor C3, a resistor R11, a resistor R12, a resistor R13, a capacitor C4, a fire line L1, a capacitor C5, a resistor R14, a VCC-3V3D port, and an AIS RF1, a TXD pin of the big dipper positioning chip is connected to the MCU through a GPS-RXD wire, an RXD pin of the big dipper positioning chip is connected to the MCU through a GPS-TXD wire, one end of the resistor R11 is connected to the GPS-RXD wire, one end of the resistor R12 is connected to the GPS-TXD wire, the other end of the resistor R11 is connected to the VCC-3V3D port after being connected to the other end of the resistor R12 in series, a VBACK pin of the big dipper positioning chip is connected to the capacitor C3 port after being connected to the VCC pin in series, one end of the capacitor C3 is connected to the VCC-3V3D port, the other end of the capacitor C3 is grounded; the VDDSUSB pin of the Beidou positioning chip is grounded, the TIMEPULSE pin of the Beidou positioning chip is connected with one end of the resistor R13, the other end of the resistor R13 is connected with one end of a GPS-1PPS lead, the other end of the GPS-1PPS lead is connected with the MCU, the No. 8 pin of the Beidou positioning chip is connected with one end of the capacitor C4 in series and then is connected with the No. 9 pin of the Beidou positioning chip, the other end of the capacitor C4 is grounded, a No. 9 pin of the Beidou positioning chip is connected with one end of the live wire L1, the other end of the live wire L1 is connected with a No. 11 pin of the Beidou positioning chip, the No. 11 pin of the Beidou positioning chip is connected with one end of the capacitor C5 in series and then is connected with one end of the resistor R14, the other end of the capacitor C5 is grounded, the other end of the resistor R14 is connected with the pin No. 1 of the AIS radio frequency device RF1, and the pin No. 2 of the AIS radio frequency device RF1 is grounded. The AIS radio frequency device RF1 is in communication connection with the AIS radio frequency module, and serial ports GPS _ TXD and GPS _ RXD and a pulse per second signal GPS _1PPS are connected to an IO port of the MCU; so that the MCU can receive a pulse per second (1 pps) signal sent by the GPS module; the utility model provides a big dipper positioning chip can be ATGM336H-5N31, but is not limited to this.

Referring to fig. 3, in an embodiment of the present invention, the present invention further includes a protection housing 4, the upper surface of the protection housing 4 is open, the inner lower surface of the protection housing 4 is provided with an electric telescopic cylinder 41, a support base 42 is provided on the telescopic end of the electric telescopic cylinder 41, the flange 3 is fixed on the support base 42 through a plurality of fixing nuts 31, the inner peripheral wall of the protection housing 4 is provided with a plurality of T-shaped sliding rails 43, the side surface of the support base 42 is provided with a T-shaped protrusion 44 embedded in the T-shaped sliding rails 43 and matched with the T-shaped sliding rails 43, the T-shaped sliding rails 43 are disposed above the electric telescopic cylinder 41, an arc-shaped partition plate 45 inclined downward is disposed between the inner left and right sides of the protection housing 4 and the electric telescopic cylinder 41, the left and right ends of the peripheral wall of the protection housing 4 are both provided with water outlets 46 matched with the arc-shaped partition plate, and the water outlet 46 is arranged above the arc-shaped partition plate 45, and the electric telescopic cylinder 41 is electrically connected with the MCU 15. Make the effect through electronic telescopic cylinder 41 can drive support base 42 and reciprocate in T type convex part 44 embedding T shape slide rail 43, support base 42 and just can drive ring flange 3 and carry out the up-and-down motion, ring flange 3 reciprocates and can drive base 1 and reciprocate, during the use, upwards rise base 1 to protection casing 4 top, when raining, can descend base 1 to protection casing 4 in for the rainwater can flow down to arc baffle 45 on through ring flange 3, and rethread outlet 46 discharges.

Referring to fig. 3, in an embodiment of the present invention, a telescopic protective sleeve 47 is disposed on a peripheral side wall of the telescopic end of the electric telescopic cylinder 41. So that the telescopic rod of the electric telescopic cylinder 41 can be protected through the telescopic protective sleeve 47.

Referring to fig. 3, in an embodiment of the present invention, the upper surface of the flange 3 is an arc with a downward opening. So that the rainwater cannot be accumulated on the flange plate 3 and flows out downwards from two sides of the flange plate 3 in rainy days.

The utility model provides an electronic telescopic cylinder, MCU, AIS radio frequency module and ARM minimum system are prior art, and MCU's model can be STM32L152, but not limited to here, and the technical staff in the field has clearly understood, does not carry out the detailed description here, just the utility model discloses what protect is based on the fishing boat identification device's of big dipper location hardware construction, with the utility model discloses a hardware construction is the basis, cooperates corresponding current program software, can accomplish the collection and the sending of fishing boat relevant information.

The utility model discloses a theory of operation: when the device is used, the protection shell is fixed on a fishing boat, the base is fixed in the protection shell under the action of the flange plate and the fixing nut, the support plate can be driven to move upwards in the T-shaped slide rail under the action of the T-shaped convex part under the action of the electric telescopic cylinder, the base is lifted to be positioned above the protection shell, the navigation dynamic state of the fishing boat is collected through the built-in Beidou positioning module, and the navigation dynamic state is remotely transmitted to a monitoring center through the AIS technology by combining with the name and the serial number information of the boat, so that the fishery is helped to master the safety and dynamic state of the fisher; the embedded two take place ofs satellite positioning module of big dipper of fishing boat monitor terminal acquires self locating information, and power supply adopts the scheme of solar energy + lithium cell, and whole module encapsulation is complete, and the fishing boat ship citizen can not close the equipment power, the utility model discloses mainly acquire self locating information through the two take place ofs satellite positioning module of embedded big dipper, and with the ship name of this ship, unique sign, ship position, navigational speed, information modulation such as course be the AIS message, upload to bank end AIS receiving station via 162MHz frequency channel, fishing boat intelligent information service platform passes through the AIS message that the AIS basic station received the fishing boat, on showing the electron sea chart with relevant information, realize small-size fishing boat remote monitoring.

It is worth mentioning that the fishing port fishing boat safety supervision system is composed of a fishing boat safety supervision system which runs in a private network and the fishing boat safety supervision system which is installed on the fishing boat, and the fishing port fishing boat safety supervision system realizes signal source access to the fishing boat through harbor area video monitoring, radar, Beidou navigation satellite, AIS system and radar system; meanwhile, relevant information system data of fishery such as maritime affairs and meteorology are accessed through a government network, and stability and reliability of data transmission are guaranteed, so that a platform can obtain real-time dynamic and static information, meteorology information, fishery administration information and the like of the fishing boat; the safety supervision system of the fishing port fishing boat is responsible for fishery information resources, service and management work. The integration and sharing of data are realized by newly building a database, utilizing the data resources of the existing fishery information system and adopting a data exchange technology.

The main function of the system is to rely on the existing fishery information system to complete the dynamic extraction, conversion, exchange and integration of relevant information data in the service systems such as a fishing boat management system, a crew management system, a fishery administration service management system, a radar system, an AIS (automatic identification system), a meteorological service system and the like, and form a central database. The dynamic monitoring, statistics and management platform of the ship is realized by comprehensively utilizing the satellite communication technology, the computer system technology and the electronic chart technology, and information services are provided for fishery administration supervision, storm early warning and ship tracking.

The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.

Claims (7)

1. The utility model provides a fishing boat identity recognition device based on big dipper location, includes big dipper orientation module, AIS radio frequency module and ARM minimum system, its characterized in that: the solar battery charging device is characterized by further comprising a base, wherein a first supporting plate, a second supporting plate and a third supporting plate are sequentially arranged on the upper surface of the base from bottom to top, the first supporting plate, the second supporting plate and the third supporting plate are arranged in a step shape, a lithium battery is arranged in the base, a solar panel used for charging the lithium battery is arranged on the third supporting plate, an MCU used for supplying power with the lithium battery is arranged on the third supporting plate, an antenna is arranged on the third supporting plate, and the MCU is arranged on the left side of the antenna; the base is provided with a transparent cover body, the lower end of the peripheral side wall of the transparent cover body is provided with a plurality of buckling pieces at equal intervals, and the lower surface of the base is provided with a flange plate; the MCU is connected with the Beidou positioning module, the AIS radio frequency module, the ARM minimum system and a charging and discharging circuit.

2. The fishing boat identity recognition device based on big dipper location of claim 1, characterized in that: the buckling piece comprises an L-shaped plate, the lower end of the peripheral side wall of the transparent cover body is provided with a ring-shaped plate matched with the first supporting plate, the ring-shaped plate is arranged on the outer side of the second supporting plate, the L-shaped plate is equidistantly arranged on the ring-shaped plate, a limiting groove is formed in the lower surface of the transverse plate of the L-shaped plate, limiting columns matched with the limiting groove are equidistantly arranged on the upper surface of the first supporting plate, and the limiting columns are arranged on the outer side of the second supporting plate.

3. The fishing boat identity recognition device based on big dipper location of claim 1, characterized in that: the lithium cell does through charge-discharge circuit MCU supplies power, MCU warp AIS radio frequency module's voltage controlled oscillator and driver amplifier communicate with band pass filter, band pass filter is in data transmission to impedance matching network through power amplifier's effect, MCU stores received data through ARM minimum system, and rethread MCU carries the signal to LED status indication for the LED lamp of fishing boat carries out status indication.

4. The fishing boat identity recognition device based on big dipper location of claim 1, characterized in that: the Beidou positioning module comprises a Beidou positioning chip, a capacitor C3, a resistor R11, a resistor R12, a resistor R13, a capacitor C4, a live wire L1, a capacitor C5, a resistor R14, a VCC-3V3D port and an AIS radio frequency device RF1, wherein a TXD pin of the Beidou positioning chip is connected with the MCU through a GPS-RXD lead, an RXD pin of the Beidou positioning chip is connected with the MCU through a GPS-TXD lead, one end of the resistor R11 is connected with the GPS-RXD lead, one end of the resistor R12 is connected with the GPS-TXD lead, the other end of the resistor R11 is connected with the other end of the resistor R12 in series and then connected with the VCC-3V3D port, a VBACK pin and a VCC pin of the Beidou positioning chip are connected with one end of the capacitor C3 in series, one end of the capacitor C3 is connected with the VCC-3V3 port D, and the other end of the capacitor C8; the VDDSUSB pin of the Beidou positioning chip is grounded, the TIMEPULSE pin of the Beidou positioning chip is connected with one end of the resistor R13, the other end of the resistor R13 is connected with one end of a GPS-1PPS lead, the other end of the GPS-1PPS lead is connected with the MCU, the No. 8 pin of the Beidou positioning chip is connected with one end of the capacitor C4 in series and then is connected with the No. 9 pin of the Beidou positioning chip, the other end of the capacitor C4 is grounded, a No. 9 pin of the Beidou positioning chip is connected with one end of the live wire L1, the other end of the live wire L1 is connected with a No. 11 pin of the Beidou positioning chip, the No. 11 pin of the Beidou positioning chip is connected with one end of the capacitor C5 in series and then is connected with one end of the resistor R14, the other end of the capacitor C5 is grounded, the other end of the resistor R14 is connected with the pin No. 1 of the AIS radio frequency device RF1, and the pin No. 2 of the AIS radio frequency device RF1 is grounded.

5. The fishing boat identity recognition device based on big dipper location of claim 1, characterized in that: the device also comprises a protective shell, the upper surface of the protective shell is open, the inner lower surface of the protective shell is provided with an electric telescopic cylinder, the telescopic end of the electric telescopic cylinder is provided with a supporting base, the flange plate is fixed on the supporting base through a plurality of fixing nuts, a plurality of T-shaped slide rails are arranged on the inner peripheral side wall of the protective shell, a T-shaped convex part which is embedded into the T-shaped slide rails and matched with the T-shaped slide rails is arranged on the side surface of the supporting base, the T-shaped slide rail is arranged above the electric telescopic cylinder, the arc-shaped partition plates which are inclined downwards are arranged between the inner left and right side surfaces of the protective shell and the electric telescopic cylinder, the left end and the right end of the circumferential side wall of the protective shell are both provided with water outlets matched with the arc-shaped partition plates, and the water outlet is arranged above the arc-shaped partition plate, and the electric telescopic cylinder is electrically connected with the MCU.

6. The fishing boat identification device based on big dipper location of claim 5, characterized in that: the peripheral side wall of the telescopic end of the electric telescopic cylinder is provided with a telescopic protective sleeve.

7. The fishing boat identity recognition device based on big dipper location of claim 1, characterized in that: the upper surface of the flange plate is arc-shaped with a downward opening.

Images