A fixed luffing jib crane ultra-high measurement and alarm device and method

Abstract

The present invention provides an ultra-high measurement and alarm device for a fixed luffing jib crane ship, which includes a tide gauge, a ship draft measurement device, a luffing angle measurement device, a measurement box, a switch and a computer workstation. The tide gauge is connected to two computer workstations through a wireless network. These two computer workstations are connected to the switch through a CAT6 Ethernet. The switch is connected to the measurement box through a CAT6 Ethernet. And the receiving end of the measurement box is electrically connected to the output ends of the ship draft measurement device and the luffing angle measurement device respectively. The present invention can measure the highest elevation of the fixed luffing jib crane ship in real time. The overall measurement accuracy of the system is high, which can timely give an early warning of the ultra-high situation of the whole ship, effectively reduce the work burden of the crew, and significantly improve the safety of ship operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevation measurement of a crane ship, and particularly relates to an ultra-high measurement and alarm device and method for a fixed luffing boom crane ship. Background Art

[0002] The main purpose of a crane ship is to provide supporting services for water operations, and its main function is to lift large and heavy objects. In recent years, due to changes in market demand, the focus of the use of crane ships has shifted to ocean engineering. The hoisting of bridge decks of large bridges mainly relies on large crane ships for construction. According to whether the crane part can rotate relative to the hull, it can be divided into rotary type and fixed type. The derrick of a fixed crane ship is further divided into variable amplitude and non-variable amplitude. In order to meet the height limit requirements of the construction water area, the crane ship must detect, alarm, and monitor the highest elevation of the entire hull, especially when the crane ship is luffing under the load working condition, so as to meet the safety production requirements of hoisting operations in the construction water area. Since the crane ship needs to move and operate in the height-limited water area for a long time, and the real-time elevation of the crane ship changes greatly during the load luffing operation. In the prior art, fixed laser pair-points are established in the safety warning water area perpendicular to the ship's navigation direction for ultra-high detection. Although it can be used for ultra-high anti-collision warning when the ship passes through the bridge, it does not have the function of real-time tracking and measuring the elevation of a crane ship that often moves and luffs under load in the height-limited water area. Moreover, for long-distance measurement, the laser beam scattering is relatively serious, resulting in low measurement accuracy and short measurement distance based on the laser beam scanning method, which limits its application. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes an ultra-high measurement and alarm device and method for a fixed luffing boom crane ship.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] An ultra-high measurement and alarm device for a fixed luffing boom crane ship, comprising a tide gauge, a ship draft measurement device, a luffing angle measurement device, a measurement box, a switch, and a computer workstation. The tide gauge is connected to two computer workstations through a wireless network. These two computer workstations are connected to the switch through CAT6 Ethernet. The switch is connected to the measurement box through CAT6 Ethernet, and the receiving end of the measurement box is electrically connected to the output ends of the ship draft measurement device and the luffing angle measurement device respectively;

[0006] The luffing angle measuring device includes a rotating shaft to be measured. A magnetic head is fixedly connected to the right end of the rotating shaft to be measured. A set screw is fixedly installed on the arc surface of the magnetic head. An inductor is movably clamped on the right side of the magnetic head. The magnetic head floats on the left side of the inductor and the two are non-contact. The side surface of the inductor is fixedly connected to an inductor fixing bracket through a third bolt and nut. A shielded random cable is fixedly connected to the bottom of the inductor. The other end of the shielded random cable is fixedly connected to a second sensor junction box.

[0007] Further, the tide gauge includes a magnetostrictive liquid level sensor, a sealing cover, and a measuring barrel. A battery module, an electronic compartment, and a tide level detection unit are respectively arranged at the left, middle, and right ends inside the sealing cover. An organic glass cover is fixedly installed on the top of the sealing cover. A first sensor random cable is arranged between the tide level detection unit and the electronic compartment. The bottom of the sealing cover is fixedly installed with a measuring barrel. A top flange is arranged at the top of the measuring barrel. The folded edge at the bottom of the sealing cover, the first sensor mounting flange, and the top flange are fixedly connected through a first bolt and nut. The magnetostrictive liquid level sensor includes an electronic compartment arranged in the sealing cover and a measuring rod extending into the measuring barrel. The magnetostrictive liquid level sensor is fixedly connected to the first sensor mounting flange through a connecting thread. The outside of the measuring rod is a stainless steel protection tube and a magnetostrictive wire is arranged inside. A float is movably sleeved on the surface of the measuring rod and it passes through the float and a locking ring is arranged at its bottom. The float is a spherical structure, and there is a perforation in the middle of the float, a permanent magnet is arranged inside and it floats on the water surface. An air vent hole is arranged on the right side near the top of the measuring barrel. A protruding flange is arranged on the outer wall of the upper part of the measuring barrel. A plurality of water permeable holes are arranged on the side wall near the bottom of the measuring barrel, and a filter screen is fixedly installed at its bottom. A pile leg is arranged on the left side of the measuring barrel. An upper fixing bracket and a lower fixing bracket are respectively fixedly installed on the upper and lower parts on the right side of the pile leg. A square flange is arranged at the upper end of the upper fixing bracket, and it is fixedly connected to the flange through a second bolt and nut assembly. The lower fixing bracket is provided with a circular ring plate, and the measuring barrel passes through the circular ring plate.

[0008] Further, the ship draft measuring device includes a seat plate flange. One side of the seat plate flange is welded to the ship's bulkhead, and the other side flange is fixedly connected to a sea stop valve. A T-shaped pressure stabilizing barrel is fixedly installed on the left side of the sea stop valve. A flanged ball valve is fixedly installed at the left end of the T-shaped pressure stabilizing barrel. A second sensor mounting flange is fixedly installed at the left end of the flanged ball valve. A pressure sensor is fixedly installed at the left end of the second sensor mounting flange. A second sensor random cable is fixedly connected to the left end of the pressure sensor. The other end of the second sensor random cable is fixedly connected to a first sensor junction box. A first breather pipe is fixedly installed on the top of the T-shaped pressure stabilizing barrel.

[0009] Furthermore, the tide level gauge is installed on the pile legs embedded outside the hull, and the pile legs are fixedly installed on the seabed of the operating sea area. The pressure sensor structure in the ship draft measurement device is arranged at the four corners of the ship, namely the left bow, left stern, right bow and right stern, and is specifically installed in the cabin near the bottom deck.

[0010] Furthermore, the angle sensor is arranged above the main deck of the hull and installed at a position close to the rotating shaft of the crane arm.

[0011] Furthermore, the measuring box, switch and computer workstation are all arranged in a centralized control room or a central control room.

[0012] A method for measuring and alarming the overheight of a fixed-type variable-luffing boom crane vessel comprises the following steps:

[0013] S1. Tide level measurement: The magnetostrictive liquid level sensor measures the tide level of the ship's operating waters and outputs a 4-20mA measurement signal to the tide level detection unit. The tide level detection unit collects the tide level measurement signal and sends the collection result to the computer workstation on board via wireless wifi.

[0014] S2. Ship draft measurement: The pressure sensor is connected to the acquisition communication module cable, and the acquisition communication module is connected to the computer workstation for communication. The pressure sensor is set at the four corners of the ship, namely the left bow, left stern, right bow and right stern, and is installed in the cabin at a preset height H0 from the bottom deck. The pressure from the sensor installation level to the tide level is measured, and a 4-20mA measurement signal is output to the acquisition communication module. The acquisition communication module collects the 4-20mA measurement signal and sends the draft data collection result to the computer workstation via Ethernet;

[0015] S3, measurement of the boom angle: the angle sensor is connected to the acquisition communication module cable, the acquisition communication module is connected to the computer workstation, the angle sensor is arranged beside the crane boom shaft on the ship and at a preset height H1 from the main deck, that is, at the same horizontal height as the central axis of the crane boom shaft, a magnetic block is installed on the measured rotating shaft that rotates with the boom shaft, and the rotation of the measured rotating shaft causes the direction of the magnetic field to change; according to the Hall effect principle, the sensor measures the boom's pitch angle by sensing the change in the direction of the magnetic field, and outputs a 4-20mA measurement signal proportional to the rotation angle to the acquisition communication module, the acquisition communication module collects the 4-20mA measurement signal, and sends the angle data collection result to the computer workstation via Ethernet;

[0016] S4, the computer workstation is connected to the tide detection unit via wireless wifi, and receives the tide data collection result sent by the tide detection unit;

[0017] S5. The computer workstation is connected to the signal acquisition module via Ethernet and receives the draft data acquisition result sent by the signal acquisition module. Based on the liquid pressure calculation formula, combined with the seawater density of the current water area on the basis of the sensor installation height H0, the draft value of the ship at this time is calculated. The molded depth of the hull is a known fixed value. Subtracting the draft value from the molded depth can obtain the distance from the water surface above the tide to the main deck.

[0018] S6. The computer workstation is connected to the signal acquisition module via Ethernet, receives the slewing angle data acquisition result sent by the signal acquisition module, and calculates the slewing angle value of the crane boom. The length of the crane boom is a known fixed value. According to the trigonometric function relationship, multiplying the length of the crane boom by the cosine value of the slewing angle and combining with the sensor installation height H1 can obtain the vertical distance from the main deck to the highest point of the crane boom.

[0019] S7. The computer workstation superimposes the tide level height of the operating water area, the distance from the water surface to the main deck, and the vertical distance from the main deck to the highest point of the crane boom, calculates the height of the ship in the operating water area, and determines whether the crane ship is within the height limit range at this time. When the highest point of the crane ship exceeds the warning value, an ultra-high warning message is automatically sent to remind the operator to take measures in time to control the height of the crane ship.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present invention measures the real-time tide level of the sea area where the crane ship operates through a tide gauge, measures the current draft value of the ship through a ship draft measuring device, and measures the front and rear slewing angles of the crane boom through a slewing angle measuring device. Therefore, the whole set of devices can measure the highest elevation of the fixed slewing boom crane ship in real time.

[0022] When the highest elevation of the whole ship reaches or even exceeds the set threshold, the system immediately automatically issues an ultra-high alarm to remind the operator to pay attention, so as to take countermeasures in time, quickly reduce the elevation of the ship, make the ship meet the height limit requirements of the operating sea area, and ensure the safety of ship operation; the sensors contained in the system have high stability, high reliability, high precision / high resolution, and can be applied in harsh industrial use environments for a long time. The method for measuring the elevation of the whole ship by the system is accurate, simple, efficient, and timely.

[0023] Compared with the past, the ultra-high measurement of sea ships by the system is no longer restricted by the measurement distance. Especially for crane ships that often move and slewing operate in height-limited waters, the overall measurement accuracy of the system is high, and it can issue an early warning of the ultra-high of the whole ship in time, effectively reducing the work burden of the crew and significantly improving the safety of ship operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of the present invention;

[0026] Figure 2 is a schematic diagram of the tide gauge in the present invention;

[0027] Figure 3 is a schematic diagram of the ship draft measuring device in the present invention;

[0028] Figure 4 is a schematic diagram of the luffing angle measuring device in the present invention;

[0029] Figure 5 is a schematic diagram of the magnetic head and inductor part in the luffing angle measuring device of the present invention;

[0030] Figure 6 is a schematic diagram of the fixed luffing boom in the present invention;

[0031] Figure 7 is a schematic diagram when the present invention is applied.

[0032] Description of reference numerals:

[0033] 1. Tide gauge; 10. Magnetostrictive liquid level sensor; 11. Sealing cover; 12. Measuring barrel; 13. Tide detection unit; 14. Battery module; 15. Electronic bin; 16. Measuring rod; 17. Float; 18. Magnetostrictive wire; 19. First sensor mounting flange; 20. Top flange; 110. Air vent hole; 111. Upper fixing bracket; 112. Lower fixing bracket; 113. Flange plate; 114. Square flange plate; 115. Filter screen; 116. Water permeable hole; 117. Plexiglass cover; 118. Locking ring; 119. Connecting thread; 120. First bolt and nut; 121. First sensor random cable; 122. Second bolt and nut; 123. Ring plate; 124. Leg.

[0034] 2. Ship draft measuring device; 21. Seat plate flange; 22. Sea stop valve; 23. T-shaped pressure stabilizing barrel; 24. Flange type ball valve; 25. Second sensor mounting flange; 26. Pressure sensor; 27. Second sensor random cable; 28. First breather pipe; 29. First sensor junction box.

[0035] 3. Luffing angle measuring device; 31. Rotating shaft to be measured; 32. Magnetic head; 33. Set screw; 34. Inductor; 35. Shielded random cable; 36. Third bolt and nut; 37. Inductor fixing bracket; 38. Second sensor junction box;

[0036] 4. Measuring box;

[0037] 5. Switch;

[0038] 6. Computer workstation. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0042] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0043] A fixed luffing jib crane ship ultra-high measurement and alarm device, as Figures 1 to 7As shown in the figure, it includes a tide gauge, a ship draft measuring device, a luffing angle measuring device, a measuring box, a switch, and a computer workstation. Among them, the tide gauge 1 is used for measuring the tide level, collecting signals, and transmitting data in the ship operation water area; the ship draft measuring device 2 is used for measuring the ship draft; the luffing angle measuring device 3 is used for measuring the luffing angle of the crane boom; the measuring box (including the PLC acquisition and communication module) 4 is used for collecting, processing, and transmitting the sensor measurement signals; the switch 5 provides Ethernet access and information sharing services for the acquisition and communication module and the computer workstation; the computer workstation 6 serves as a display terminal to provide human-machine interface interaction services.

[0044] The tide gauge is connected to two computer workstations through a wireless network. These two computer workstations are connected to the switch through CAT6 Ethernet. The switch is connected to the measuring box through CAT6 Ethernet. And the receiving ends of the measuring box are electrically connected to the output ends of the ship draft measuring device and the luffing angle measuring device respectively.

[0045] The luffing angle measuring device includes a measured rotating shaft. A magnetic head is fixedly connected to the right end of the measured rotating shaft. A set screw is fixedly installed on the arc surface of the magnetic head. An inductor is movably clamped on the right side of the magnetic head. The magnetic head floats on the left side of the inductor and there is no contact between them. The side of the inductor is fixedly connected to an inductor fixing bracket through a third bolt and nut. A shielded random cable is fixedly connected to the bottom of the inductor. The other end of the shielded random cable is fixedly connected to a second sensor junction box.

[0046] The crane boom rotating shaft is connected to the measured rotating shaft. The measured rotating shaft is inserted into the magnetic head. Threaded holes are opened on the surface of the magnetic head, and the magnetic head is fixed on the measured rotating shaft with set screws. A magnetic steel is embedded in the head of the magnetic head. There is no direct contact between the magnetic head and the inductor, and they are kept within a specified distance range. The inductor is fixed to the inductor fixing bracket through bolts and nuts. When the crane boom rotates, the measured rotating shaft rotates with the boom rotating shaft and transmits the rotation angle to the magnetic head. The rotation of the magnetic head changes the magnetic field direction of the magnetic head. The inductor converts the change in the magnetic field direction of the magnetic head into an electrical signal and outputs a 4-20 mA measurement signal through the shielded random cable. The shielded random cable is connected to the terminal block in the sensor junction box, and the terminal block of the sensor junction box is also connected to the cable of the external acquisition and communication module to transmit the measurement signal to the acquisition and communication module;

[0047] The magnetic induction angular displacement sensor fully makes up for the contact life problem of the conductive plastic potentiometer and the defect of the incremental relative value of the optical encoder, that is, it is an absolute non-contact analog angular displacement sensor. The non-contact measurement has high reliability, high accuracy, and good durability.

[0048] Inside the sealed cover 11, a tide level detection unit 13 and a battery module 14 are provided. There is an acrylic glass cover 117 on the top of the cover shell, through which the situation inside the sealed cover 11 can be observed. The hem at the bottom of the sealed cover 11, the first sensor mounting flange 19, and the top flange 20 at the top of the measuring barrel 12 are fixedly connected by a first bolt and nut assembly 120. The magnetostrictive liquid level sensor 10 is fixedly connected to the first sensor mounting flange 19 through a connecting thread 119. The magnetostrictive liquid level sensor 10 includes an electronic bin 15 arranged inside the sealed cover 11 and a measuring rod 16 extending into the measuring barrel 12. The outside of the measuring rod 16 is a stainless steel protective tube, and a magnetostrictive wire 18 is arranged inside. The measuring rod 16 passes through the float 17. A locking ring 118 is provided at the bottom of the measuring rod 16. The float 17 is a spherical structure with a perforation in the middle and a permanent magnet inside, and it can float on the water surface.

[0049] On the right side near the top of the measuring barrel 12, an air vent hole 110 is provided. The bottom is open and provided with a sea creature-proof filter screen 115. A water permeable hole 116 is opened on the outer wall of the bottom side. When the measuring barrel 12 is inserted into the water surface to be measured, the liquid level inside the barrel is the same as the liquid level outside the barrel.

[0050] A pile leg 124 is pre-buried in the ship operation water area. Two annular fixing brackets are installed on the pile leg 124. The upper fixing bracket 111 is provided with a square flange 114. A protruding flange 113 is provided on the outer wall of the upper part of the measuring barrel 12. The square flange 114 and the flange 113 are connected by a second bolt and nut 122. The lower fixing bracket 112 is provided with a circular ring plate 123, and the measuring barrel 12 passes through the circular ring plate 123.

[0051] When the electronic bin 15 of the sensor is powered on, the electronic circuit inside the electronic bin 15 generates a starting pulse. This starting pulse is transmitted along the magnetostrictive wire 18 at a constant speed, and at the same time, a rotating magnetic field that follows the pulse along the magnetostrictive wire 18 is generated. When this magnetic field meets the permanent magnetic field of the float 17, a magnetostrictive effect will occur, causing the magnetostrictive wire 18 to twist. The electronic bin 15 senses this twist and converts it into a corresponding termination pulse. By calculating the time difference between the starting pulse and the termination pulse, the displacement of the pulse can be accurately measured, and then the accurate liquid level value can be obtained. The electronic bin 15 outputs a 4 - 20mA measurement signal to the tide level detection unit 13 inside the sealed cover 11 through the sensor random cable 121.

[0052] The tide level detection unit in the sealed cover is equipped with a microprocessor, which receives the 4-20mA measurement signal output by the electronic compartment and calculates the tide level value based on the water level change data in the barrel measured by the magnetostrictive liquid level sensor. The microprocessor is connected to the wireless communication module, and can be connected to the computer workstation on the crane ship through wireless wifi to transmit the real-time collected tide level value to the computer workstation. The battery module in the sealed cover provides power for the microprocessor, wireless communication module, and magnetostrictive liquid level sensor.

[0053] The ship draft measuring device includes a seat plate flange, one side of the seat plate flange is welded to the ship bulkhead, and the other side flange is fixedly connected to a sea shut-off valve, a T-shaped pressure stabilizing barrel is fixedly installed on the left side of the sea shut-off valve, a flange-type ball valve is fixedly installed on the left end of the T-shaped pressure stabilizing barrel, a second sensor mounting flange is fixedly installed on the left end of the flange-type ball valve, a pressure sensor is fixedly installed on the left end of the second sensor mounting flange, a second sensor random cable is fixedly connected to the left end of the pressure sensor, the other end of the second sensor random cable is fixedly connected to a first sensor junction box, and a first air vent is fixedly installed on the top of the T-shaped pressure stabilizing barrel.

[0054] Specifically, the seat plate flange is welded on the bulkhead near the bottom deck of the ship, and the seat plate flange is connected to the sea shut-off valve flange. The sea shut-off valve is used to open and close the connection with the external seawater. The sea shut-off valve opens upward, and the seawater enters the T-type pressure stabilizing barrel and the vent pipe through the bulkhead opening, the seat plate flange and the sea shut-off valve. The T-type pressure stabilizing barrel is respectively connected and flange-connected with the flange ball valve, the vent pipe and the sea shut-off valve for wave protection and pressure stabilization and pipeline diameter conversion. The vent pipe is connected to the external atmosphere, and the liquid level in the vent pipe is at the same height as the liquid level outside the cabin.

[0055] The flange ball valve is connected to the sensor mounting flange with bolts and nuts, and the sensor mounting flange is threadedly connected to the pressure sensor probe. When the flange ball valve is opened, the pressure sensor probe senses the water column height pressure in the vent pipe, converts the water column height pressure signal into an electrical signal, and outputs a 4-20mA measurement signal through the sensor random cable. The sensor random cable is connected to the terminal in the sensor junction box, and the terminal of the sensor junction box is connected to the external acquisition communication module cable to transmit the measurement signal to the acquisition communication module.

[0056] Usually, the tide gauge is installed on the pile legs embedded outside the hull, and the pile legs are fixedly installed on the seabed of the operating sea area. The pressure sensor structure in the ship draft measurement device is set at the four corners of the ship, namely the left bow, left stern, right bow and right stern, and is specifically installed in the cabin near the bottom deck. The angle sensor is set above the main deck of the hull and installed near the rotating shaft of the crane arm. The measuring box, switch and computer workstation are all set in the centralized control room or central control room.

[0057] A method for measuring and alarming the ultra-high level of a fixed luffing jib crane vessel, comprising the following steps:

[0058] S1. Tide level measurement: A magnetostrictive liquid level sensor measures the tide level height of the ship's operation water area and outputs a 4-20 mA measurement signal to the tide level detection unit. The tide level detection unit collects the tide level height measurement signal and sends the collected result to the computer workstation on the ship through wireless wifi;

[0059] S2. Ship draft measurement: A pressure sensor is connected to the acquisition and communication module by a cable, and the acquisition and communication module is communicatively connected to the computer workstation. The pressure sensors are arranged at the four corners of the ship, namely the left bow, left stern, right bow, and right stern, and are installed at a preset height H0 from the bottom deck of the ship's cabin. The pressure from the measurement sensor installation horizontal plane to the tide level horizontal plane is measured and a 4-20 mA measurement signal is output to the acquisition and communication module. The acquisition and communication module collects the 4-20 mA measurement signal and sends the draft data acquisition result to the computer workstation through Ethernet;

[0060] S3. Measurement of the luffing angle of the crane boom: An angle sensor is connected to the acquisition and communication module by a cable, and the acquisition and communication module is communicatively connected to the computer workstation. The angle sensor is arranged beside the rotating shaft of the crane boom on the ship and at a preset height H1 from the main deck, that is, at the same horizontal height as the central axis of the rotating shaft of the crane boom. A magnetic block is installed on the measured rotating shaft that rotates with the boom shaft, and the rotation of the measured rotating shaft causes a change in the magnetic field direction; According to the Hall effect principle, the sensor measures the luffing angle of the boom's forward and backward pitching by sensing the change in the magnetic field direction and outputs a 4-20 mA measurement signal proportional to the rotation angle to the acquisition and communication module. The acquisition and communication module collects the 4-20 mA measurement signal and sends the rotation angle data acquisition result to the computer workstation through Ethernet;

[0061] S4. The computer workstation is connected to the tide level detection unit through wireless wifi and receives the tide level data acquisition result sent by the tide level detection unit;

[0062] S5. The computer workstation is connected to the signal acquisition module through Ethernet and receives the draft data acquisition result sent by the signal acquisition module; According to the liquid pressure calculation formula, based on the sensor installation height H0 and combined with the seawater density of the current water area, the draft value of the ship at this time is calculated. The molded depth of the hull is a known fixed value, and the distance from the tide level above to the main deck can be obtained by subtracting the draft value from the molded depth;

[0063] S6. The computer workstation is connected to the signal acquisition module via Ethernet, receives the corner data acquisition result sent by the signal acquisition module, and calculates the luffing angle value of the crane boom. The length of the crane boom is a known fixed value. According to the trigonometric function relationship, multiplying the length of the crane boom by the cosine value of the luffing angle and combining with the sensor installation height H1 can obtain the vertical distance from the main deck to the highest point of the crane boom.

[0064] S7. The computer workstation superimposes the tide level height of the operation water area, the distance from the tide surface to the main deck, and the vertical distance from the main deck to the highest point of the crane boom, calculates the ship height in the operation water area, and determines whether the crane ship is within the height limit range at this time. When the highest point of the crane ship exceeds the warning value, an ultra-high warning message is automatically sent to remind the operator to take measures in time to control the height of the crane ship.

[0065] The present invention measures the real-time tide level of the operation sea area of the crane ship through a tide level gauge, measures the current draft value of the ship through a ship draft measuring device, and measures the front and rear luffing angles of the crane boom through a luffing angle measuring device. Therefore, the whole set of devices can measure the highest elevation of the fixed luffing boom crane ship in real time.

[0066] When the highest elevation of the whole ship reaches or even exceeds the set threshold, the system immediately automatically issues an ultra-high alarm to remind the operator to pay attention, so as to take countermeasures in time, quickly reduce the elevation of the ship, make the ship meet the height limit requirements of the operation sea area, and ensure the safety of ship operation. The sensors included in the system have high stability, high reliability, high precision / high resolution, and can be applied in harsh industrial use environments for a long time. The method for measuring the elevation of the whole ship by the system is accurate, simple, efficient, and timely.

[0067] Compared with the past, the ultra-high measurement of the offshore ship by the system is no longer restricted by the measurement distance. Especially for the crane ship that often moves and luffs in the height limit water area, the overall measurement accuracy of the system is high, and it can issue an early warning of the ultra-high of the whole ship in time, effectively reducing the work burden of the crew and significantly improving the safety of ship operation.

[0068] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixed luffing jib crane ship ultra-high measurement and alarm device, characterized in that: It includes a tide level meter, a ship draft measuring device, an amplitude angle measuring device, a measuring box, a switch and a computer workstation, and is characterized by: The tide level meter is connected to two computer workstations via a wireless network, the two computer workstations are connected to a switch via CAT6 Ethernet, the switch is connected to a measuring box via CAT6 Ethernet, and a receiving end of the measuring box is electrically connected to output ends of a ship draft measuring device and an amplitude angle measuring device, respectively; The variable amplitude angle measuring device includes a measured rotating shaft, a magnetic head is fixedly connected to the right end of the measured rotating shaft, a set screw is fixedly installed on the arc surface of the magnetic head, a sensing body is movably connected to the right side of the magnetic head, the magnetic head is suspended on the left side of the sensing body and there is no contact between the two, a side surface of the sensing body is fixedly connected to a sensing body fixing bracket through a third bolt and nut, a shielding net random cable is fixedly connected to the bottom of the sensing body, and the other end of the shielding net random cable is fixedly connected to a second sensor junction box.

2. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 1, characterized in that: The tide level meter includes a magnetostrictive liquid level sensor, a sealing cover, and a measuring barrel. A battery module, an electronic compartment, and a tide level detection unit are arranged inside the sealing cover. The tide level detection unit and the electronic compartment are connected by a first sensor random cable. A measuring barrel is fixedly installed at the bottom of the sealing cover, and a top flange is arranged on the top of the measuring barrel. An air conduction hole is arranged on the right side of the measuring barrel near the top, and a plurality of water permeable holes are arranged on the side wall of the measuring barrel near the bottom.

3. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 2, characterized in that: The magnetostrictive liquid level sensor comprises an electronic compartment arranged in a sealing cover and a measuring rod extending into a measuring barrel. The magnetostrictive liquid level sensor is fixedly connected to a first sensor mounting flange via a connecting thread.

4. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 3, characterized in that: The measuring rod has a stainless steel protection tube on the outside and a magnetostrictive wire on the inside. A float is movably sleeved on the surface of the measuring rod, and a locking ring is arranged at one end of the measuring rod that passes through the float.

5. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 1, characterized in that: The ship draft measuring device includes a seat plate flange, one side of the seat plate flange is welded to the ship bulkhead, and the other side is fixedly connected to the sea shut-off valve. A T-shaped pressure stabilizing barrel is fixedly installed on the left side of the sea shut-off valve, and a first air vent is fixedly installed on the top of the T-shaped pressure stabilizing barrel.

6. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 1, characterized in that: The tide level meter is installed on a pile leg pre-buried on the outside of the hull, and the pile leg is fixedly installed on the seabed of the operating sea area.

7. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 1, characterized in that: The angle sensor is arranged above the main deck of the hull and installed at a position close to the rotating shaft of the crane arm.

8. The fixed luffing jib crane ship ultra-high measurement and alarm device according to claim 1, characterized in that: The measuring box, the switch and the computer workstation are all arranged in a centralized control room or a central control room.

9. A fixed luffing jib crane ship ultra-high measurement and alarm method, characterized in that, The steps include: S1. Tide level measurement: The magnetostrictive liquid level sensor measures the tide level of the ship's operating waters and outputs a 4-20mA measurement signal to the tide level detection unit. The tide level detection unit collects the tide level measurement signal and sends the collection result to the computer workstation on board via wireless wifi. S2. Ship draft measurement: The pressure sensor is connected to the acquisition and communication module by cable, and the acquisition and communication module is communicatively connected to the computer workstation. The pressure sensors are arranged at the four corners of the ship, namely the bow port, the stern port, the bow starboard, and the stern starboard, and are installed at a preset height H0 above the bottom deck inside the cabin. The pressure from the horizontal plane of the measurement sensor installation to the tide level horizontal plane is measured, and a 4-20 mA measurement signal is output to the acquisition and communication module. The acquisition and communication module collects the 4-20 mA measurement signal and sends the draft data acquisition result to the computer workstation via Ethernet; S3. Measurement of the luffing angle of the crane boom: The angle sensor is connected to the acquisition and communication module by cable, and the acquisition and communication module is communicatively connected to the computer workstation. The angle sensor is arranged beside the rotating shaft of the crane boom on the ship and at a preset height H1 above the main deck, that is, at the same horizontal height as the central axis of the rotating shaft of the crane boom. A magnetic block is installed on the measured rotating shaft that rotates with the boom shaft, and the rotation of the measured rotating shaft causes a change in the magnetic field direction. According to the Hall effect principle, the sensor measures the luffing angle of the boom's forward and backward pitching by sensing the change in the magnetic field direction and outputs a 4-20 mA measurement signal proportional to the rotation angle to the acquisition and communication module. The acquisition and communication module collects the 4-20 mA measurement signal and sends the rotation angle data acquisition result to the computer workstation via Ethernet; S4. The computer workstation is connected to the tide level detection unit via wireless wifi and receives the tide level data acquisition result sent by the tide level detection unit; S5. The computer workstation is connected to the signal acquisition module via Ethernet and receives the draft data acquisition result sent by the signal acquisition module; According to the liquid pressure calculation formula, based on the sensor installation height H0 and combined with the seawater density of the current water area, the draft value of the ship at this time is calculated. The molded depth of the hull is a known fixed value. Subtracting the draft value from the molded depth gives the distance from the water surface above the tide to the main deck; S6. The computer workstation is connected to the signal acquisition module via Ethernet and receives the rotation angle data acquisition result sent by the signal acquisition module, and calculates the luffing angle value of the crane boom; The length of the crane boom is a known fixed value. According to the trigonometric function relationship, multiplying the length of the crane boom by the cosine value of the luffing angle and combined with the sensor installation height H1 gives the vertical distance from the main deck to the highest point of the crane boom; S7. The computer workstation superimposes the tide level height, the distance from the water surface to the main deck, and the vertical distance from the main deck to the highest point of the crane boom in the working water area, calculates the height of the ship in the working water area, and determines whether the crane ship is within the height limit range at this time. When the highest point of the crane ship exceeds the warning value, an ultra-high warning message is automatically sent to remind the operator to take measures in time to control the height of the crane ship.

Images