Claims:1. An emergency power supply device for an electromagnetic crane, the emergency power supply device comprising:
an emergency battery voltage relay (KV1) disposed between an alternator (ALT) and an N/O switch (SKV1), wherein through the N/O switch (SKV1), an emergency battery (EB) and the electromagnet (EM) are electrically connected,
wherein the emergency battery voltage relay (KV1) is energized on engine cranking, and the energizing of the emergency battery voltage relay (KV1) closes the N/O switch (SKV1) to close an electric circuit for supplying the electricity from the emergency battery (EB) to the electromagnet (EM).
2. The emergency power supply device as claimed in claim 1, wherein the N/O switch (SKV1) opens when the current supplied by the emergency battery reaches the level of 170 volts.
3. The emergency power supply device as claimed in claim 1, comprises a battery charger (BC) electrically connected to the alternator (ALT) for the charging the emergency battery (EB).
4. The emergency power supply device as claimed in claim 1, wherein the emergency battery voltage relay (KV1) includes a relay coil which takes a predetermined time to energize.
5. The emergency power supply device as claimed in claim 4, wherein when the relay coil is fully energized, the emergency battery voltage relay (KV1) outputs the electricity from the emergency battery (EB) to the electromagnet (EM).
, Description:EMERGENCY POWER SUPPLY DEVICE
TECHNICAL FIELD
[0001] The present disclosure, in general, relates to the technical field of lifting, and, more particularly, to an emergency power supply device for an electromagnetic crane.
BACKGROUND
[0002] Background description includes information that may be useful in understanding the present disclosure. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed subject matter, or that any publication specifically or implicitly referenced is prior art.
[0003] Electromagnetic crane is a widely used lifting machine, usually including a large car, a trolley, an electromagnet (also called a lifting magnet), and an electromagnet lifting mechanism for lifting and lowering an electromagnet hook holding the electromagnet for holding and lifting objects made of iron. The electromagnetic crane uses the electromagnet to hold and lift heavy weight magnetically conductive objects, which obviously results in an increase in production efficiency. In working condition, the electromagnet is energized by the electricity supplied by an alternator of the electromagnetic crane. However, when the supply from the alternator fails due to electric circuit failure or any other reason, the electromagnet is de-energized and the suspended heavy object falls. Such falling of heaving objects may cause an accident for personnel or equipment.
[0004] Conventionally, in order to prevent a power failure or a power outage caused by, say, failure of a power grid or an electric circuit of the electromagnetic crane, the electromagnetic crane is usually equipped with an emergency power supply device for supplying electricity to the electromagnet for emergency protection. The emergency power supply device may include a battery charger/inverter and an emergency/auxiliary battery to supply the power or electricity to the electromagnet, to ensure that the suspended weight does not suddenly fall from the electromagnet.
[0005] In the state of the art, although the emergency power supply device is provided to prevent failure of the supply of the electricity to the electromagnet, the emergency power supply device keeps on supplying the current to the electromagnet even when the electromagnetic crane is not in operation. Such a constant supply of the electricity through the components of the emergency power supply device may reduce the life span of these components, and may result in their sudden failure during actual operation.
[0006] Accordingly, it will be apparent to the skilled artisan that there exists a need in the state of the art for an improved system for operating the ripper vehicle during the cleaning process of the ladle.

OBJECTS OF THE DISCLOSURE
[0007] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed hereinbelow.
[0008] It is a general object of the present disclosure to provide an improved emergency power supply device for an electromagnetic crane.
[0009] It is an object of the present disclosure to provide a modification to an emergency battery voltage relay.
[0010] These and other objects and advantages will become more apparent when reference is made to the following description and accompanying drawings.

SUMMARY
[0011] This summary is provided to introduce concepts related to an emergency power supply device for an electromagnetic crane. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0012] In accordance with an embodiment, the present disclosure relates to an emergency power supply device for an electromagnetic crane. The emergency power supply device includes an emergency battery voltage relay (KV1) disposed between an alternator (ALT) and an N/O switch (SKV1), wherein through the N/O switch (SKV1), an emergency battery (EB) and the electromagnet (EM) are electrically connected. The emergency battery voltage relay (KV1) is energized on engine cranking, and the energizing of the emergency battery voltage relay (KV1) closes the N/O switch (SKV1) to close an electric circuit for supplying the electricity from the emergency battery (EB) to the electromagnet (EM).
[0013] In an aspect, the N/O switch (SKV1) opens when the current supplied by the emergency battery reaches the level of 170 volts.
[0014] In an aspect, the emergency power supply device includes a battery charger (BC) electrically connected to the alternator (ALT) for the charging the emergency battery (EB).
[0015] In an aspect, the emergency battery voltage relay (KV1) includes a relay coil which takes a predetermined time to energize.
[0016] In an aspect, when the relay coil is fully energized, the emergency battery voltage relay (KV1) outputs the electricity from the emergency battery (EB) to the electromagnet (EM).
[0017] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and methods that are consistent with the subject matter as claimed herein, wherein:
[0019] FIG. 1 illustrates a circuit diagram of an emergency power supply device for an electromagnetic crane in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0020] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0021] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0023] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0024] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0025] Embodiments explained herein pertain to an emergency power supply device for an electromagnetic crane. Regardless of their specific construction, a diagram of the emergency power supply device proposed in accordance with the present disclosure is shown in FIG. 1. Further, the conventional electrical components of the emergency power supply device as shown in FIG. 1 and their working are well known in the art and are thus omitted from this disclosure for the sake of brevity and/or clarity.
[0026] Referring to FIG. 1, a driver or an operator of an electromagnetic crane may crank the engine by actuating the starter (STARTER). When the starter (STARTER) is actuated, the starter (STARTER) connects battery switch (BATTERY SWITCH) to receive electric power required for cranking or starting of the engine.
[0027] Once the engine has been started, an alternator (ALT) coupled to the engine takes over and starts supplying electric power to the electromagnet (EM) through a first magnet connection point (I+) and to a battery charger (BC) through battery charger connection points (BC+) and (BC-). Upon receiving the electric power supply, the battery charger (BC) starts charging the emergency battery (EB). However, the emergency battery (EB) cannot start supply of the electricity to a second magnet connection point (M-) until an N/O switch (SKV1) is in open state/condition.
[0028] The N/O switch (SKV1) is closed by an emergency battery voltage relay (KV1) disposed between the alternator (ALT) and the N/O switch (SKV1). The emergency battery voltage relay (KV1) includes a relay coil which takes a predetermined time to energize. When the relay coil is fully energized, the emergency battery voltage relay (KV1) outputs the electricity from the emergency battery (EB) to the electromagnet (EM).
[0029] In an aspect, the emergency battery voltage relay (KV1) is energized on engine cranking, and the energizing of the emergency battery voltage relay (KV1) closes the N/O switch (SKV1) to close an electric circuit for supplying the electricity from the emergency battery (EB) to the electromagnet (EM). In this way, the supply of the electricity from the emergency battery (EB) to the electromagnet (EM) is provided only when the electromagnetic crane is in operation. Such a controlled supply of the electricity through the components of the emergency power supply device may enhance the life span of these components and may improve the stability and reliability of the entire emergency power supply device.
[0030] In an aspect, the N/O switch (SKV1) opens when the current supplied by the emergency battery reaches the level of 170 volts.
[0031] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those skilled in art are capable of choosing suitable manufacturing and design details.
[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0033] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0034] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended