Portal crane with a set of elevators

FIELD: mechanics.

SUBSTANCE: invention is related to the field of portal cranes with a set of elevators. To control the lift system, load distribution is determined by two holders (12, 16), lift units (20a-20f) and load connectors (34) are grouped so as for the center of gravity to fall on one group, located between the two groups, within the groups, forming a design load for each group, increasing the design load stepwise up to the design load. They check the lift system for safety, tension, movement and speed of each cable, the load imbalance. The lift system includes a number of independent units of lift drums (20a-20f) located on the two spaced holders (12, 16), load beams, cargo (L) and a cargo connector (34). The cargo connector (34) is linked to the lift drum (20a-20f) with a cable (28). The cargo synchronises the lift drums (20a-20f). Installation of marine and coastal structures is carried out.

EFFECT: increased operation efficiency.

7 cl, 11 dwg

 

The technical FIELD TO WHICH the PRESENT INVENTION

[0001] the Present invention relates to the field of gantry cranes with multiple lifts for lifting and lowering prefabricated structures. In particular, the invention relates to a system and method of synchronizing multiple independent lifts, gantry cranes for safe lifting and lowering a suspended load.

PRIOR art

[0002] Marine or coastal structures are usually large and heavy. Often crane with one lift is not enough to lift such a large marine or coastal structures. In the shipyard resort to the practice of preparing such marine structures and subsequent installation of these modules in terms of the floating dock. For example, semi-submersible platforms are equipped with the hull and deck. The body is made in the form of two pontoons with a number of vertical columns on each of the pontoons. The pontoons and the vertical columns are usually fitted with steel plates and partitions forming a number of internal compartments or ballast tanks. The platform is also equipped with plates and partitions. The water is pumped or pumped out of the ballast tanks to adjust the buoyancy of the hull and/or platforms during installation or the whole semi-submersible platform during operation.

[003] the Size and weight of such modules by sea or team design is usually limited to operating parameters and working height available crane equipment. Partially assembled pontoon, column or platform used with ballast tanks or containers often drift on the sea surface instead of service on earth cranes. For example, a partially assembled platform can drift over in submerged body; and then immersed body then rises to the surface in order to lift a partially completed platform above the water level so as to provide the opportunity for further work on the platform in the sea. Such mounting structures in the open sea depends on weather conditions and available floating cranes. This makes the Assembly of such structures is expensive and dangerous.

[0004] Such marine structures are usually made of steel, and they require periodic maintenance. Often, when their life reaches approximately 10-20 years, it is economically expedient to reconstruct marine design instead of building new. To raise such marine structure located above the valve, the septum must be interconnected and designed to rise above the device. Different parts of a design can have a different weight. Therefore, it is preferable to use a crane, equipped with multiple lifts; and therefore, to ensure that b is the security required method of controlling a crane with a lot of lifts.

A SUMMARY of the PRESENT INVENTION

[0005] Here presents a simplified summary of the essence of the present invention, in order to give a basic idea of the present invention. This summary is not an exhaustive description of the invention and is not intended to identify key aspects of the present invention. On the contrary, it is some inventive concept of the present invention is summarized as a prelude to the detailed description following below.

[0006] In one embodiment of the present invention is a lifting mechanism is equipped with a number of independent hoisting drums placed on each of two spaced clamps. The lifting system consists of the cargo connector used to connect a cable associated with each of the respective winding reels, and shipping with two longitudinal cargo beams, spaced at almost the same distance as the spaced clips where the cargo connector is used to connect to the longitudinal cargo beams, and the cargo itself synchronizes independent lifting the reels during the operations of descent/ascent.

[0007] In another embodiment, the present invention is a control method in asanoi above the lifting system. The control method consists of determining the load distribution on the two clips; grouping lifting units and associated freight connectors in one or more groups so that the center of gravity falls on one group is between two groups or accounts for all groups; the establishment of a specific load for each one or more groups of winding units and associated freight connectors and increase the load by a specified increment, for example 10%to the nominal load during operation with simultaneous check the safety of the lifting system; tension, movement, and speed of each cable and the imbalance of the load.

BRIEF DESCRIPTION REFERENCE DRAWINGS

[0008] the Present invention will be described by non-limiting number of embodiments of the present invention with reference to the reference drawings, on which:

[0009] On FIGA presents gantry crane with two clips in accordance with the implementation of the present invention;

On FIGU presents the use of freight connectors and load-carrying beams for lowering/lifting crane, shown in figa;

On figs presents freight connector shown in figa and 1B;

On fig.1D presents a lifting site shown in figa and 1B; and

On five presents the layout of the cable blocks shown in F. GA and 1B.

[0010] figure 2 presents a map of the production process to ensure the safety of the crane shown in figa in accordance with another variant of implementation of the present invention; and

[0011] On figa-3E presents the group lifts to synchronize individual lifting units and control load balancing in accordance with another alternative implementation of the present invention.

DETAILED DESCRIPTION of the PRESENT INVENTION

[0012] Here will be described one or more specific embodiments of the present invention with reference to the accompanying drawings. However, the specialist in this area should be clear that the present invention can be used without such specific descriptions. Some details it is impossible to describe in detail without overloading the description of the invention with unnecessary detail. For simplicity, use the same numeric symbols or groups of numerical designations indicated on the drawings used for the same or similar parts in the drawings.

[0013] On figa shows the lifting system 10 in accordance with one embodiment of the present invention. As can be seen from tiga, the lifting system 10 is composed of a fixed upper yoke 12 and CNC top yoke 16 for retaining the cargo L. Fixed upper ferrule 12 p is smushaetsja on two columns 13, and the punch holder 16 is located on top of the two lower columns 17. Although fixed ferrule 12 and the punch holder 16 are located at different heights, they are approximately parallel to one another. On each of the clips 12, 16 placed six lifting nodes 20a, 20b 20f.... As shown in figa, 1D and 1E, each of the lifting nodes 20a, 20b 20f...is composed of the drum 22, the lifting motor device 24, the number of lift brake 26a, 26b,... etc., a position sensor (encoder) 27, the cable 28, the cable blocks 30 and the load sensor 29. Rope blocks 30 include a number of fixed blocks 31 and a number of freight connectors 34 connected with a number of movable blocks 32 to collaborate with fixed blocks 31 and corner pulleys 36.

[0014] As shown in figa, fixed blocks 31a, 31b... etc. connected with the lower edge of each clip 12, 16 movable manner along the longitudinal axis of the corresponding clips on a straight-line distance from each other. Moveable blocks 32a, 32b... etc. on the freight connectors 34 uniformly and evenly distributed through links 38a, 38b, 38c. In the operation of trucks connectors 34 are connected with the longitudinal load-carrying beam 40 on the load L. As shown in figa and 1B, there are two spaced load-carrying beams 40a, 40b. The upper punch holder 16 is separated from the fixed upper casing 12 is approximately the same distance, Thu and spaced load-carrying beams 40a, 40b.

[0015] the Lifting system 10 also includes a control panel 50, not shown in figa. The control panel 50 is composed of at least a programmable logic controller (PLC) 52, the drive/inverter 54 for each hoist motor, the audio signal 56, the emergency stop button 58 and the Central management console 60. PLC 52 is programmed in such a way as to allow manual and automatic control of a separate lifting nodes 20 or lifting groups of nodes. Central management console 60 comprises at least a display/touch panel 62, the control levers 64a, 64b... etc. each lifting node indicator 66, the audio signal 56 and the emergency brake 58.

[0016] the Present invention the tension transmitted from each of the lifting node 20a, 20b... etc, evenly distributed corresponding sets of fixed blocks 30 and the movable block 32 to the appropriate freight connectors 34 and load-carrying beams 40a, 40b. The load transmitted to various lifting node or group of lifts can vary depending on the position of the centre of gravity of the load L.

[0017] the Operation of the lifting system 10 includes the following operations:

1. Security check;

2. Prednamerennoe and calibration;

3. The control level; and

4. Simultaneous working groups of the rise.

Figure 2 shows the routing 200 safe operation of the lifting system 10 in accordance with another variant of implementation of the present invention. As shown in figure 2, the operation of the lifting system 200 begins at step 205. In step 205, the power is supplied to the control panel 50, the Central management console 60 and the signal lights 70.

[0018] Next, in step 210, a decision is made whether the selected lifting group, taking into account the weight of the load L and the location of its center of gravity. If at step 210 the lifting group is chosen incorrectly, the system 200 is interrupted. If the decision at step 210 was correct, the system 200 proceeds to step 215.

[0019] In step 215, the electric power is applied to the motor element of the lift, 24, and all other elements of the lifting system 10.

[0020] In step 220, the decision about the involvement of any security mechanisms. The security mechanisms include activation of the emergency stop button 58 and/or translation of the system in the mode of repair/maintenance, programming mode or calibration mode. If any of the safety systems activated, the system is transferred to step 222. If none of the security mechanisms are not activated, the system moves to step 225.

[0021] In step 225, each of the lifting inverters/drives motors 54 system checked for normality. The EU and verified in step 225 gives a negative result, i.e. the inverter/drive of the lifting motor can be in an emergency situation, the system is interrupted; then, on the Central management console 60 is sent to the signal, and for notification of emergency indicator light 66. If the test at step 225 gives a positive result, the system continues and moves to step 230.

[0022] In step 230, the decision associated with overheating of any of the lifting motors 24. If the decision at step 230 is positive, on the Central control panel 60 zagoraetsa corresponding indicator light 66, as it was in the repair zone in step 238. Overheating of the winding motor can result from malfunction of the fan 232, malfunction of thermistor 234, exceeding the period of maintenance 236, overload, etc. After the malfunction of the lifting motor repair indicator is set to zero at step 238. Then check the system at step 240, it is checked whether made zero reset indicator repair/reset. If the repair/reset performed, for example, after a specified time interval, the system is interrupted in step 227. If the repair/reset is executed, the system returns back to step 230 and the condition of overheating of the winding motor is checked again. When all lifting motors 24 are normal RA is ochem condition, the system moves to step 245.

[0023] In step 245, the decision on whether in the normal condition, each of the lifting position sensors 27. In the normal state, the position of each of the position sensor 27 indicates straulino the cable length from the respective winding drum 22, which is calculated to determine the vertical position of the load L. At the same time is determined by the rotation in terms of each device to indicate speed of the winding drum 22. If at step 245 a negative decision, i.e. lifting position sensor 27 is not working, the system is interrupted and jumps to step 295 to the monitoring program error identification/indication of an emergency, for example, by ignition of the corresponding light indicator 66. If the decision at step 245 positive, the system proceeds to step 250.

[0024] In step 250, each hoist brake 26a, 26b,... etc. is checked for being in working condition. If the Elevator brake 26a, 26b,... etc. is idle, the system is interrupted and jumps to step 295 to the monitoring program failure to identify faults and warnings fault occurs. If all lifting brake 26a, 26b,... etc. are in working condition, work is istemi proceeds to step 255.

[0025] In step 255 each brake disc is checked for being in the normal state. If any of the brake discs worn and the corresponding brake cylinder close to the development of the resource, the system operation is interrupted and jumps to step 295 program monitoring/warning. If all discs are in good condition, the system proceeds to step 257.

[0026] In step 257, the speed of each of the winding drum 22 in the selected lifting group formed in step 210, increases by 10%, and then the lifting system moves to step 260.

[0027] In step 260, the speed of each of the winding drum is checked against the norm. If the speed of the winding drum is too high, there may occur a failure or refusal on the corresponding cable 28. Additionally, or alternatively, the corresponding lifting the brake 26 or the gear 24 may be damaged. If the lifting drum is rotating too slowly, it may be overloaded. If the test at step 260 determines an abnormal speed of the winding drum, the system stops and starts monitoring program errors/report in step 295. If the speed of all lifting devices 24 in the normal operation of the system proceeds to step 270.

[0028] In step 270, each load sensor 29 associated with lifting us what device 24, checked for possible overload. If the load sensor 29 is overloaded, the status of the load sensor is checked again at step 272 after a specified predetermined period of time. If the test at step 272 again shows a positive result, the system stops and proceeds to step 295, the program error monitoring/reporting. If at step 270 none of lifting devices is not overloaded or overload conditions in step 272 is fixed, the system proceeds to step 275.

[0029] In step 275, the system 200 allows an operator to control the lifting device 24 on the descent or ascent in accordance with the operator's commands. At the same time, the system continues to scan the system for violations of safety.

[0030] In step 280 dynamic load and displacement of each cable associated with each lifting device are subject to normal operating conditions. If the load and displacement abnormal, for example, due to sagging or breaking the cable, the system pauses and goes to the error monitoring/reporting at step 295. If the load and move all cables are normal, the system jumps to step 285.

[0031] In step 285 lifting devices 24 are scanned in synchronism. If the difference in speed of any of lifting devices 24 exceeds a pre-the plant and the percent increase in speed compared to all other lifting devices, the system stops and goes to the error monitoring/reporting at step 295. If the difference in the rate of rise between all lifting devices consistent with the change in the number of rows of rope on the hoist drum 22, the system moves to step 290.

[0032] In step 290 is checked again any imbalance of the load L. the Imbalance of the load L may be due to the wrong choice in the formation of a group of lifts. If this imbalance happens and installed in advance the percentage difference of the tension and movement of the cable in step 280 not found any synchronization lifting devices at step 285 is not detected, the system stops and starts the program monitoring/reporting step 295. If the imbalance of the load L is not detected, the system 200 moves to step 292.

[0033] In step 292, the system 200 checks whether the full speed of each of the selected winding drum 22 to its full speed. If the decision at step 272 is negative, the system 200 returns to step 257 and the speed of the lift is increased in increments of 10% of full speed. After each speed lift system 200 repeatedly performs the steps 260 through 290, then the decision at step 292. If the decision at step 292 is positive, which means that the corresponding hoist drum 22 has reached full speed, the system 200 moves back to the site 273 and continues to check each lifting device from step 272 to step 292 to ensure safe operation.

[0034] the Load L, considered in the framework of the present invention is typically large and expensive; as a result, the center of gravity is usually located outside the geometric center. Therefore, raising the load L should be planned so that the center of gravity of the cargo was in the zone specified freight connectors 34 to ensure that the load is not turned over during the ascent or descent. This problem is complexity in the framework of the present invention, because all the lifting Assembly 24 are not synchronized among themselves mechanically. This is found in the framework of the present invention, the problem is overcome by the rigidity of the load L acting as a synchronization mechanism. At the same time, load and speed ropes 28 are tracked so that the load L remained aligned during ascent or descent.

[0035] On figa-3E shows different ways of grouping lifting devices 24 to ensure the safe operation of the system 200 in accordance with the present invention. As shown in figa, some lifts in both clips 12, 16 are in the same group so that the center of gravity falls on the area defined by this group of lifts. If the tension in any lifting device group selected lifts exceeds safe for them to load, lifting stop and monitor the nga errors will prompt the operator to rearrange lifting devices to ensure safe operation.

[0036] On figa presents group lifting devices 24 formed on each of the two clips in addition to the third group, posted on both clips. On FIGU presents the third group of lifting devices 24 on the yoke and the other two groups on the second holder. On figs presents U-group lifts, distributed on both clips. On fig.3D presents group lifting devices 24 formed on each of the two clips 12,16. On file shows the formation of a group of lifting devices 24 on the yoke and L-group, distributed in two clips. In these possible ways of forming groups of lifts the center of gravity falls on a large body defined by a group of lifts. During the ascent or descent of the load L is constant monitoring of the power cable tension and speed on each lifting device 24, i.e. to ensure a safe work environment the cable tension is maintained within the safe working load; at the same time, the system 200 ensures that the speed of the cables does not exceed a predefined range of values in percent, so that the sets of lifting mechanisms 24 worked almost simultaneously and the load L was almost aligned.

[0037] After carrying out all the checks in steps 210-255 and establish that the tension and movement of the rope/cable and interest from the Lonnie lie within the permissible settlement limits, lifting-lowering operation continues according to step 275. During startup, for example, during the initial preparation of the system or after performing maintenance, the step of lifting operations 275 includes a step 277 prenotazione and calibration and step 278 alignment of the cargo. In one embodiment, the implementation of prednamerennoe is carried out by lifting each set of movable stevovich blocks 32 and freight connectors 34 at a low speed so that to pick up the slack in all cables. When the slack in all cables selected, all sensors load 29 in the Central management console 60 associated with each lifting device 20, are set to zero, and indications of the position of the control lever 64 are set to the original value.

[0038] In step 278 alignment load test load is applied to two or more groups of lifting devices 20, and a test load is lifted a predetermined constant speed. After each test the alignment of the load position and velocity of each lifting device 20 is recorded by the logging device associated with the PLC 52. The vertical position of the test load and the speed of lifting devices are analyzed, for example, according to the testimony of the elevation changes and the corresponding speed, lift with the lowest rate in biretta as a base of reference, and its position and velocity are used as the basic data regarding the position and speed of all other lifting devices 20. In other words, automatically calibrating the position and speed of recovery, after which you can implement manual or automatic adjustment. Additionally calibrated load cells 29. The system 200 also allows manual or automatic control of the whole crane.

[0039] After prenotazione, calibration and automatic alignment of the lifting system lifting system 10 is ready for use. As shown in figure 2, the lifting system 10 continues to monitor the tension and move all the cables 28 in step 280. Advanced lifting system 10 continues to monitor and control load position L by checking synchronization of all lifting devices 20 in step 285 and verification of imbalance at step 290.

[0040] the Use of grouping lifts in accordance with the present invention are determined by the mass and the center of gravity of the various modules that make up the load L. the Determined load distribution, and then selecting groups of lifts, where each group has a set weight. During operations on the ascent/descent design load is increased in increments of 10% during the predetermined period of time. During each increment of load are all security checks from step 220 to step 272, the tension/move to step 280 and the imbalance of load steps 285 and 290. If there is any imbalance of cargo, overrides groups of lifts, and the system 200 is carried out again.

[0041] while have been described and illustrated specific examples of implementation, it should be understood that the present invention can be made many changes, modifications, variations and combinations, not distracting from the essence of the present invention. For example, can be used gantry crane with many ski lifts, or more than two rings.

1. Lifting system with many independent nodes winding drum located at each end of the two spaced clips, the system consisting of
freight connector for connection of a cable associated with each respective lifting drum, and
cargo with two longitudinal cargo beams, spaced approximately the same distance as the spaced clips,
where the cargo connector used for connection with the longitudinal cargo beam, and the load synchronizes independent lifting the reels during the operations of descent/ascent.

2. Lifting si is theme according to claim 1, where the cargo connector is connected with a movable skivvy unit and fixed skivvy unit, located on the corresponding clip.

3. The method of controlling the lifting system according to claim 1 or 2, consisting in the determination of load distribution on the two clips,
the grouping of winding units and the corresponding freight connectors in one or more groups so that the center of gravity falls on one group is between two groups or within groups,
the formation of the design load for each of the one or more groups of winding units and the corresponding freight connectors
and step-by-step increase in load by a specified amount to the estimated load during the operation of checking the lifting system security, tension, movement and speed of each cable, and the imbalance of the load.

4. The control method according to claim 3, wherein the preset step value is 10% of the rated load.

5. The control method according to claim 3 or 4, in which the imbalance of load occurs as a result of exceeding the percentage change in tension, motion or speed of the lifting of the node specified percentage changes.

6. The control method according to any one of p-5, further consisting in prednamerennoe each cable and the appropriate calibration of the load cell and load balancing.

7. The control method according to claim 6, in which the om after performing alignment of the goods, lift with the lowest speed is used as an employee base of reference lift, move or speed which is referenced by other lifts.



 

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