A hoist emergency power conversion system

Abstract

This utility model discloses an emergency power conversion system for lifting equipment, comprising: a transfer switch, one input of which is connected to an external power source via a circuit breaker, and the other input of which is connected to a battery via a circuit breaker and an inverter; its output is connected to a control system via an isolation transformer; the external power source is connected to an electromagnet via a contactor and a rectifier, and then to a transfer mechanism via the contactor; the battery is connected to the electromagnet via a diode; and a supercapacitor is connected to the transfer mechanism via a bidirectional rectifier. Thus, when the external power source fails, the transfer switch switches the battery to provide emergency power to the control system and the electromagnet, while the supercapacitor provides emergency power to the transfer mechanism. The control system can then conveniently control the transfer mechanism and the electromagnet for emergency emergency response without requiring separate manual control of each mechanism, significantly improving operational efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lifting system technology, and in particular to an emergency power conversion system for lifting devices. Background Technology

[0002] In recent years, electromagnetic lifting devices have been introduced into steel loading and unloading operations. Compared with traditional mechanical lifting devices, electromagnetic lifting devices have a fast response speed and do not require precise docking of mechanical structures. Electromagnets can quickly attract steel, enabling rapid lifting and transportation.

[0003] In terms of emergency design, traditional mechanical lifting equipment usually has self-locking capability. Its mechanical structure can lock the steel in the event of a power outage to prevent the steel from falling during the lifting process. In addition, traditional mechanical lifting equipment is often equipped with emergency power generation equipment, which can be started after a power outage to restore power supply.

[0004] However, electromagnetic lifting devices lack a mechanical locking structure between the electromagnet and the steel. If power is lost and the magnetism is deactivated, the steel will immediately fall. Therefore, existing electromagnetic lifting devices are typically equipped with batteries to provide emergency power to the electromagnet during power outages. These batteries have low output current but high total energy, allowing the electromagnet to maintain a firm hold on the steel for a period while awaiting power restoration or connection to a generator. Furthermore, some electromagnetic lifting devices are equipped with supercapacitors for the transfer mechanism. Supercapacitors have lower total energy but higher output current, enabling short-range operation of the transfer mechanism to move the steel to a safe area before lowering it.

[0005] However, in the above emergency plan for electromagnetic lifting equipment, the battery and supercapacitor are only auxiliary safety configurations and are not interconnected with the control circuit of the electromagnetic lifting equipment. In the event of a power outage, the control system is actually in a shutdown state. The operator needs to manually operate the transfer mechanism to move the steel to a safe area for lowering and placement, and then manually operate the electromagnet to disconnect the battery power supply to the electromagnet, so that the electromagnet is separated from the steel. Then, the operator needs to manually operate the transfer mechanism to retract the electromagnet winch to a safe height.

[0006] It is evident that existing emergency solutions for electromagnetic lifting devices only consider the most basic fall prevention and short-distance relocation. In the event of a power outage, manual removal of steel stranded during the transfer process is still required, which consumes a significant amount of manpower and time. Utility Model Content

[0007] This embodiment discloses an emergency power conversion system for lifting equipment, specifically including: The changeover switch SA1 has one input connected to an external power source via circuit breaker Q5, and its other input connected to battery E via circuit breaker Q6 and inverter BP6. Its output is connected to the control system via isolation transformer T1. The external power supply is connected to the electromagnet DY1 via contactor KM6 and rectifier BP4, and to the transfer mechanism via contactor KM2. The battery E is also connected to the electromagnet DY1 via diode D1; The supercapacitor C is connected to the transfer mechanism via a bidirectional rectifier BP5.

[0008] As an optional implementation, the changeover switch SA1 is used to turn on one input and turn off two inputs when an external power source is connected, so that the external power source supplies the operation of the control system, the electromagnet DY1 and the transfer mechanism.

[0009] As an optional implementation, the transfer switch SA1 is also used to conduct two inputs when the external power supply is interrupted, and the battery E generates emergency system power through the inverter BR6 and transmits it to the control system. The battery E also transmits emergency electromagnetic power to the electromagnet DY1 via the diode D1.

[0010] As an optional implementation, one input of the changeover switch SA1 takes precedence over two inputs.

[0011] As an optional implementation, the supercapacitor C is used to supply emergency transfer power to the transfer mechanism through the bidirectional rectifier BP5 when the external power supply is interrupted.

[0012] As an optional implementation, the transfer mechanism includes a hoisting motor M1, a luffing motor M2, and a slewing motor M3; The hoisting motor M1 is connected to the emergency transfer power supply via frequency converter BP1, the luffing motor M2 is connected to the emergency transfer power supply via frequency converter BP2, and the slewing motor M3 is connected to the emergency transfer power supply via frequency converter BP3.

[0013] As an optional implementation, the frequency converter BP1 is connected to the contactor KM2 through the circuit breaker Q2, and a contactor KM3 is installed between it and the supercapacitor C; The frequency converter BP2 is connected to the contactor KM2 through the circuit breaker Q3, and a contactor KM4 is assembled between it and the supercapacitor C. The frequency converter BP3 is connected to the contactor KM2 through the circuit breaker Q4, and a contactor KM5 is assembled between it and the supercapacitor C.

[0014] As an optional implementation, the lifting motor M1 is also used to generate a charging current based on the gravitational potential energy conversion of the suspended object when lowering it.

[0015] As an optional implementation, the charging current is used to charge the supercapacitor C by rectifying it through the bidirectional rectifier BP5.

[0016] As an optional implementation, a DC fuse FU2 is installed between the battery E and the inverter BP6; A DC fuse FU1 is installed between the bidirectional rectifier BP5 and the transfer mechanism.

[0017] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, when the external power supply fails, the switch switches the battery to provide emergency power to the control system and the electromagnet, while the supercapacitor provides emergency power to the transfer mechanism. The transfer mechanism and the electromagnet can be conveniently controlled by the control system to handle emergency hazards without the need for manual control of each mechanism, thus greatly improving work efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a circuit diagram of an emergency power conversion system for lifting equipment disclosed in this embodiment. Detailed Implementation

[0020] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Please see Figure 1 This embodiment discloses an emergency power conversion system for lifting equipment, comprising: The changeover switch SA1 has one input connected to an external power source via circuit breaker Q5, and its other input connected to battery E via circuit breaker Q6 and inverter BP6. Its output is connected to the control system via isolation transformer T1. An external power supply is connected to an electromagnet DY1 via a contactor KM6 and a rectifier BP4, and then connected to a transfer mechanism via a contactor KM2. Battery E is also connected to electromagnet DY1 via diode D1; The supercapacitor C is connected to the transfer mechanism via a bidirectional rectifier BP5.

[0022] In this embodiment, the transfer switch switches the battery to provide emergency power to the control system and electromagnet when the external power supply fails, while the supercapacitor provides emergency power to the transfer mechanism.

[0023] Here, in addition to keeping the electromagnet from losing its magnetism and ensuring the steel is firmly attracted, the battery also inverts to generate power for the emergency system and maintains the operation of the control system. Thus, the electromagnet and the transfer mechanism can be easily operated through the control system to transfer suspended objects such as steel suspended in the air to a safe area for lowering and placement.

[0024] For example, suppose steel is being hoisted from a transport ship to the port for stacking. When the steel is hoisted to the edge of the dock, the electromagnetic crane suddenly loses power. At this time, the battery maintains the electromagnet's firm attraction to the steel, with one end of the steel above the dock and the other end above the ship.

[0025] At this time, the battery also keeps the control system running. The control system can control the electromagnet and the transfer mechanism, while the supercapacitor can supply the transfer mechanism for short-distance transfer.

[0026] Thus, staff can promptly control the transfer mechanism through the control system to drive the electromagnet to perform actions such as lifting / lowering, luffing, and rotation, so that the steel can be rotated and placed in the placement area of ​​the transport ship, or placed in a safe area of ​​the dock nearby, eliminating safety hazards.

[0027] As an optional implementation, the changeover switch SA1 is used to turn on one input and turn off two inputs when an external power source is connected, so that the control system, electromagnet DY1 and transfer mechanism are powered by the external power source.

[0028] As an optional implementation, the transfer switch SA1 is also used to conduct two inputs when the external power supply is interrupted, and the battery E is inverted by the inverter BR6 to generate emergency system power and transmit it to the control system. Battery E also transmits emergency electromagnetic power to electromagnet DY1 via diode D1.

[0029] As an optional implementation, one input of the changeover switch SA1 takes precedence over two inputs.

[0030] Here, when there is an external power input in one input, the selector switch SA1 preferably uses the external power supply. Only when the external power supply is cut off will it switch to the second input and be powered by the battery.

[0031] As an optional implementation, the supercapacitor C is used to supply emergency transfer power to the transfer mechanism through the bidirectional rectifier BP5 when the external power supply is interrupted.

[0032] Here, the drive transfer mechanism requires a high current value. Although the total energy of the supercapacitor is relatively small, it can continuously output a high current value for a short period of time, thereby providing short-term emergency power for the drive transfer mechanism, ensuring that the suspended object is transferred horizontally to a safe area above the ground, and ensuring that even if the electromagnet loses its magnetism and the suspended object falls, it will not cause damage to the ship or dock facilities.

[0033] As an optional implementation, the transfer mechanism includes a hoisting motor M1, a luffing motor M2, and a slewing motor M3; The hoisting motor M1 is connected to the emergency power supply via frequency converter BP1, the luffing motor M2 is connected to the emergency power supply via frequency converter BP2, and the slewing motor M3 is connected to the emergency power supply via frequency converter BP3.

[0034] As an optional implementation, the frequency converter BP1 is connected to the contactor KM2 through the circuit breaker Q2, and a contactor KM3 is installed between it and the supercapacitor C. The frequency converter BP2 is connected to the contactor KM2 through the circuit breaker Q3, and a contactor KM4 is assembled between it and the supercapacitor C. The frequency converter BP3 is connected to the contactor KM2 through the circuit breaker Q4, and the contactor KM5 is installed between it and the supercapacitor C.

[0035] As an optional implementation, the hoisting motor M1 is also used to generate a charging current based on the gravitational potential energy conversion of the suspended object when lowering it.

[0036] As an alternative implementation, the charging current is used to charge the supercapacitor C by rectifying it through the bidirectional rectifier BP5.

[0037] Here, each time the hoisting motor lowers the suspended object, the charging current generated by its conversion will charge the supercapacitor, ensuring that the supercapacitor can always provide sufficient emergency transfer current.

[0038] Furthermore, the operation of lowering the suspended object does not consume the current of the supercapacitor; on the contrary, it can charge the supercapacitor. The suspended object can be safely landed by simply controlling the braking mechanism of the lifting motor through the control system.

[0039] It is evident that, without the need for further lifting of the suspended object, only the luffing motor and the slewing motor consume the supercapacitor's power, ensuring safe transfer of the suspended object in most power outage scenarios.

[0040] As an optional implementation, a DC fuse FU2 is installed between the battery E and the inverter BP6; A DC fuse FU1 is installed between the bidirectional rectifier BP5 and the transfer mechanism.

[0041] Here, a DC fuse is used as a safety device to prevent damage to other components of the electromagnetic lifting device due to overload or other reasons.

[0042] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, when the external power supply fails, the switch switches the battery to provide emergency power to the control system and the electromagnet, while the supercapacitor provides emergency power to the transfer mechanism. The transfer mechanism and the electromagnet can be conveniently controlled by the control system to handle emergency hazards without the need for manual control of each mechanism, thus greatly improving work efficiency.

Claims

1. An emergency power conversion system for lifting equipment, characterized in that, include: The changeover switch SA1 has one input connected to an external power source via circuit breaker Q5, and its other input connected to battery E via circuit breaker Q6 and inverter BP6. Its output is connected to the control system via isolation transformer T1. The external power supply is connected to the electromagnet DY1 via contactor KM6 and rectifier BP4, and to the transfer mechanism via contactor KM2. The battery E is also connected to the electromagnet DY1 via diode D1; The supercapacitor C is connected to the transfer mechanism via a bidirectional rectifier BP5.

2. The emergency power conversion system for lifting equipment according to claim 1, characterized in that, include: The changeover switch SA1 is used to turn on one input and turn off two inputs when an external power source is connected, so that the external power source supplies the operation of the control system, the electromagnet DY1 and the transfer mechanism.

3. The emergency power conversion system for lifting equipment according to claim 2, characterized in that, include: The changeover switch SA1 is also used to conduct two inputs when the external power supply is interrupted. The battery E is inverted by the inverter BR6 to generate emergency system power and transmit it to the control system. The battery E also transmits emergency electromagnetic power to the electromagnet DY1 via the diode D1.

4. The emergency power conversion system for lifting equipment according to claim 3, characterized in that, include: One input of the changeover switch SA1 takes precedence over two inputs.

5. The emergency power conversion system for lifting equipment according to claim 3, characterized in that, include: The supercapacitor C is used to supply emergency transfer power to the transfer mechanism through the bidirectional rectifier BP5 when the external power supply is interrupted.

6. The emergency power conversion system for lifting equipment according to claim 5, characterized in that, include: The transfer mechanism includes a hoisting motor M1, a luffing motor M2, and a slewing motor M3; The hoisting motor M1 is connected to the emergency transfer power supply via frequency converter BP1, the luffing motor M2 is connected to the emergency transfer power supply via frequency converter BP2, and the slewing motor M3 is connected to the emergency transfer power supply via frequency converter BP3.

7. The emergency power conversion system for lifting equipment according to claim 6, characterized in that, include: The frequency converter BP1 is connected to the contactor KM2 through the circuit breaker Q2, and a contactor KM3 is assembled between it and the supercapacitor C. The frequency converter BP2 is connected to the contactor KM2 through the circuit breaker Q3, and a contactor KM4 is assembled between it and the supercapacitor C. The frequency converter BP3 is connected to the contactor KM2 through the circuit breaker Q4, and a contactor KM5 is assembled between it and the supercapacitor C.

8. The emergency power conversion system for lifting equipment according to claim 6, characterized in that, include: The lifting motor M1 is also used to generate a charging current based on the gravitational potential energy conversion of the suspended object when lowering it.

9. The emergency power conversion system for lifting equipment according to claim 8, characterized in that, include: The charging current is used to charge the supercapacitor C by being rectified by the bidirectional rectifier BP5.

10. The emergency power conversion system for lifting equipment according to claim 1, characterized in that, include: A DC fuse FU2 is installed between the battery E and the inverter BP6. A DC fuse FU1 is installed between the bidirectional rectifier BP5 and the transfer mechanism.

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