DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patent Rules, 2003
COMPLETE SPECIFICATION
(See sections 10 & rule 13)
1. TITLE OF THE INVENTION
A BRAKE INTEGRATED POWER ISOLATION MECHANISM FOR TRACTION MOTOR IN FLAME PROOF BATTERY OPERATED LOCOMOTIVE
2. APPLICANT (S)
NAME NATIONALITY ADDRESS
BEML LIMITED IN BEML Soudha, No 23/1, 4th Main S.R. Nagar, Bengaluru- 560027, Karnataka, India.
3. PREAMBLE TO THE DESCRIPTION
COMPLETE SPECIFICATION

The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF INVENTION:
[001] The present invention relates to the field of a mine auxiliary transport system. The present invention in particular relates to a brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive for underground mine application.
DESCRIPTION OF THE RELATED ART:
[002] Flame Proof (FLP) battery operated locomotive is used in underground gassy (coal) mines to transport the blasted coal filled in tubs from extraction point to unloading / dumping area at extreme atmospheric conditions of 95% humidity & 45°C ambient temperature. All electrical aggregates used in flame proof Battery Operated Locomotive are designed for flame proof in nature and approved by Directorate General of Mines Safety (DGMS) in India. Typically, braking system of flame proof battery operated locomotive are conventional and serves as both service and parking brake.
[003] Thus in conventional braking system of flame proof battery operated locomotive, when brake is applied, the equalizer type linkage mechanism distributes the force on brake shoes simultaneously and halts the locomotive. It is mandatory that the braking system of Locomotive to be designed in such a way that the braking torque should exceed the wheel torque which is required for locomotives for safe operation inside mines.
[004] In underground mines, Locomotive is exhaustively used to complete prescribed number of loaded trips by operator per day. Hence Locomotive will be in running continuously in between loading point and unloading point.
[005] In such condition, Locomotive operator tend to apply brake without decelerating which leads to overloading of the Traction motor. The overloading further leads to damage of Traction motor windings and reduces the operational life of the Traction motor which also minimize the productivity of Locomotive. Even though Traction motors are flameproof in nature, such frequent winding failure generating sparks inside the motor enclosure is not safe in especially underground coal mines.
[006] Also, when Locomotive is parked with parking brake ON and if operator tries to move the Locomotive by mistake, it lead to overloading of Traction motor thereby resulting in reduced operational life. Further the brake shoes engaged on rail wheels wear out rapidly and causes brake failure during operation.
[007] Reference may be made to the following:
[008] Publication No. CN101204958 relates to a mine trackless transport locomotive used for underground subsidiary transport, which comprises a pre driver chamber and a post driver chamber, a driving device, a battery, a load-bearing wheelbarrow, a hoist apparatus, a hydraulic system, an electrical control system, etc. A traction motor in the driving device and a hydraulic pump motor of the hydraulic system both adopt three-phase AC motors, which are provided with AC by the battery through a transducer. The electrical control system comprises of a programmable controller, the transducer, a speed and direction sensor, a pressure sensor, a photoelectric conversion isolation plate, a dashboard, a display board, an intrinsic safety power source, an explosion septal and intrinsic safe electric control box, etc. The traction motor of the trackless motor and the hydraulic pump motor adopt alternating current motors which have the advantages of light weight, small size, low price, convenient maintenance and wide application. The above prior art describes electrical control system established in Monorail crane used in underground to convert Direct current source into Alternating current source to supply regulated current to traction motors.
[009] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[010] Publication No. CN106080208 relates to a high-voltage isolation control circuit of a locomotive. The high-voltage isolation control circuit is characterized in that a compressed air end is connected with an air line of a high-voltage isolation switch; the pantograph connecting poison of the high-voltage isolation switch is connected with a pantograph; the main circuit breaker connecting position of the high-voltage isolation switch is connected with a main circuit breaker of the locomotive, and the disconnecting position is connected with a locomotive body; the tripping signal output end of a locomotive control and diagnosis system is connected with a time relay coil in the high-voltage isolation switch; an external power source is connected with a tripping electric emptying valve through a normally open contact of the time relay; a connecting point is arranged between the tripping signal output end of the locomotive control and diagnosis system and the pantograph descending signal input end; when the locomotive control and diagnosis system sends out a tripping signal, the tripping signal is used as a pantograph descending signal, and is sent back to the input end of the locomotive control and diagnosis system. This aims at the introducing high voltage power isolating control circuit to avoid the power grid tripping or burning due to malfunction of high voltage isolating switch in Pantograph type locomotive.
[011] The present invention provides power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[012] Publication No. CN102627109 provides a battery control circuit for a double-electrical-energy locomotive, comprising a dc switch, a charger, batteries and isolated conversion units. When an overhead contact system supplies power for traction, the batteries are discharged through the charger and the isolated conversion units; when the batteries supply power for traction, the locomotive is pulled by electrical energy of the batteries through the isolated conversion unit and the dc switch; and when the locomotive is in a regenerative breaking condition, the batteries are charged by feedback braking energy of a traction motor through the charger and the isolated conversion units. This aims to provide a battery control circuit for a dual electric energy locomotive to solve problems of battery charge, discharge and regenerative braking energy absorption.
[013] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[014] Publication No. CN104698870 relates to a mining flame-proof and intrinsically-safe multifunctional electrical control box comprising an AC220V power incoming line. The AC220V power incoming line is connected with the input end of an intrinsically-safe power supply through a fuse, and the output end of the intrinsically-safe power supply is connected with the input ends of a light partition board and an LM3109H programmable controller. The input end of the LM3109H programmable controller is connected with the output end of the light partition board, and the output end of the LM3109H programmable controller is connected with a display lamp and a display screen. The mining flame-proof and intrinsically-safe multifunctional electrical control box adopting the scheme has the characteristics that with the application of the LM3109H programmable controller, action of nine sets of equipment can be controlled, the working efficiency is increased, and the input cost and fault rate are reduced; in addition, the LM3109H programmable controller has high anti-interference capability. This pertains to multi-function mine electrical control box used in underground coal mines and it has the ability to simultaneously control nine underground equipment functions.
[015] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[016] Publication No. CN209208501 relates to the technical field of energy recovery, in particular to an electric energy recovery device of a traction braking system on a subway. The electric energy recovery device of the traction braking system on the subway comprises a motor and a flywheel, the motor and the flywheel are connected to a rotating shaft and arranged in an isolation hood, the two ends of the rotating shaft are each connected with a pair of bearings, and damping blocks are arranged at the joints of the rotating shaft and the bearings. This aims to provide a electrical energy recovery device for a traction braking system on a subway. The electric energy generated during regenerative braking is absorbed and released when other locomotives need energy for other locomotives in power supply section.
[017] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[018] Publication No. CN104627004 relates to an integrated power source for providing power for a diesel locomotive auxiliary transmission system and a train. The integrated power source comprises a main generator and an AC-DC main rectifying circuit. The DC output component of the AC-DC main rectifying circuit provides power for a traction motor through a traction circuit switch and a traction inversion module. The DC output component of the AC-DC main rectifying circuit provides power for the diesel locomotive auxiliary transmission system and the train through a DC-DC chopping set-down module, a DC-AC inversion module, an isolation transformer and an AC-DC auxiliary rectifying module in sequence. This aims to provide a integrated power supply for diesel locomotive auxiliary transmission and train power supply with main generator and an AC-DC rectifier circuit. During resistance braking in locomotive the kinetic energy of traction motor can be converted in to electrical energy for auxiliary transmission and train power supply to achieve energy saving.
[019] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[020] Publication No. CN110239464 relates to a flame-proof type low-voltage standby power supply device for explosion-proof vehicles in an underground coal mine. The problem that when a driver forgets to turn off a power supply of a vehicle after using the vehicle, a state of the vehicle flameout and no power generation can be automatically detected, and a low-voltage standby power switch of the vehicle is cut off to prevent the power supply is solved. This depicts that the invented device can automatically detect the state that the explosion proof vehicle in coal mine is turned OFF and then cut off the low voltage backup power switch of vehicle to prevent electricity loss if operator forget to turn off the vehicle power supply after using vehicle.
[021] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[022] Publication No. CN202389227 relates to a mine trackless rubber-wheel vehicle driven by a storage battery, comprising a traction motor and a controller, wherein the traction motor is connected with a trackless rubber-wheel vehicle, the controller is used for controlling a working state of the trackless rubber-wheel vehicle through the traction motor, and an input end of the controller is respectively connected with a pedal switch, an operation box and a drive device; the drive device comprises a storage battery and a storage battery management device, the storage battery is arranged in a mine flame-proof casing and is arranged in cavities, and the storage battery management device is connected with the storage battery; and the storage battery utilizes a lithium ion storage battery. This depicts the battery driven mining rail less free wheeled vehicle is a utility model which has controller for controlling the working state of motor.
[023] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[024] Publication no. CN113346587 provides an isolation breaking method and device and a power supply system. The method is applied to a control module of the isolation breaking device. The isolation breaking device comprises a current detection module and an isolation breaking module which are connected with the control module, the isolation breaking module is connected to a charging and discharging loop of a protection battery cluster and to-be-powered equipment; and after the current value, detected by the current detection module, on the charging and discharging loop is obtained, an isolation control instruction is generated based on the current value, and the isolation control instruction is sent to the isolation breaking module to control the isolation breaking module to break the charging and discharging loop, so that the protection battery cluster and the to-be-powered equipment are disconnected and isolated from each other. This depicts the isolation and breaking module connected to charging and discharging circuit of protection battery cluster and the equipment to be powered.
[025] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[026] Publication no. CN113224816 provides a series battery pack protection and equalization circuit with an isolation interface and a gating network and a control method. Meanwhile, the invention provides a corresponding isolation interface and a gating network circuit. This depicts battery pack protection and equalization circuit with an isolation interface and a gating network and a control method.
[027] The present invention depicts the Power isolation mechanism for traction motor integrated to braking system to prevent overloading or damage to traction motor windings in flame proof battery operated locomotive.
[028] In order to overcome above listed prior art, the present invention aims to provide a brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive for underground mine application. It isolates power supply to traction motor of flame proof battery locomotive whenever operator applies brake when locomotive is in operation. The present invention integrates power isolation mechanism with present braking system of locomotive just before the brake is applied. Also, it prevents movement of Locomotive by operator when parked with parking brake ON resulting in increased operational life of the Traction motor. Further it prevents the wearing of brake shoes engaged on rail wheels thereby prevent brake failure during operation.
OBJECTS OF THE INVENTION:
[029] The principal object of the present invention is to provide a brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive for underground mine application.
[030] Another object of the present invention is to prevent operator to move the Locomotive in parking condition with brakes are engaged.
[031] Yet another object of the present invention is to provide a brake integrated power isolation mechanism which is more reliable in preventing failure of motor windings and thereby reduces the breakdown time of Locomotive.
[032] Still another object of the present invention is to integrate power isolation mechanism with present conventional braking system of locomotive.
SUMMARY OF THE INVENTION:
[033] The present invention relates to a brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive for underground mine application. The present invention integrates power isolation mechanism with present braking system of locomotive just before the brake is applied. It isolates power supply to traction motor of flame proof battery locomotive whenever operator applies brake when locomotive is in operation. A power isolation mechanism is provided with braking system, which when operated, cuts off the electric supply to Traction motor before brake is applied on Locomotive wheels.
BREIF DESCRIPTION OF THE INVENTION
[034] It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments.
[035] Fig. 1 and 2, represents a typical flame proof battery operated locomotive with brake integrated power isolation mechanism for traction motor.
DETAILED DESCRIPTION OF THE INVENTION:
[036] The present invention provides a brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive for underground mine application. The present invention integrates power isolation mechanism with present braking system of locomotive just before the brake is applied. It isolates power supply to traction motor of flame proof battery locomotive whenever operator applies brake when locomotive is in operation. A power isolation mechanism is provided with braking system, which when operated, cuts off the electric supply to Traction motor before brake is applied on Locomotive wheels.
[037] Fig. 1 and 2, represents a typical flame proof battery operated locomotive with brake integrated power isolation mechanism for traction motor. The mechanism consists of a limit switch (11) mounted on a fixed member of locomotive. One end of the spring loaded lever (12) is attached to limit switch (11). Push rod (13), fixed to brake link (16) is in contact with free end of the spring loaded lever (12). Traction motors (1) & (2) which are prime movers in locomotive controlled from control panel (14). Brake lever (15) is provided to apply brake on rail wheels (3), (4), (5) & (6) through brake link (16), equalizer type mechanism (17) and brake shoes (7), (8), (9), & (10). The braking system ensures the straight line movement of the push rod (13) when brake is applied or released.
[038] When locomotive is in operation, the brake shoes (7), (8), (9), & (10) are not engaged on rail wheels (3), (4), (5) & (6). In this condition, push rod (13) will be pressing the spring loaded lever (12) and limit switch (11) will be in ON position. i.e. connecting the power supply from control panel (14) to traction motors (1) & (2). When operator applies brake by rotating the brake lever (15) in anticlockwise direction, motion is transferred to brake link (16) in turn moves the push rod (13) in a straight line towards operator side thereby releasing spring loaded lever (12) of limit switch (11) to OFF position. In this condition, the power supply from control panel (14) to traction motors (1) & (2) is isolated before the brake shoe (7), (8), (9), & (10) engages on rail wheels (3), (4), (5) & (6) respectively. Further rotation of the brake lever (15) engages the brake shoe (7), (8), (9), & (10) on the rail wheels (3), (4), (5) & (6) respectively. Since the power isolation of traction series motors (1) & (2) happens just before brakes are engaged, overheating due to continuous inflow of current to motor which causes failure of motor windings are prevented.
[039] As the mechanism is external to control panel and operated mechanically, it is more reliable in preventing failure of motor windings and thereby reduces the breakdown time of locomotive.
[040] Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.
,CLAIMS:WE CLAIM:
1. A brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive for underground mine application comprises-
a) limit switch (11) mounted on a fixed member of locomotive.
b) One end of the spring loaded lever (12) attached to limit switch (11).
c) Push rod (13), fixed to brake link (16) in contact with free end of the spring loaded lever (12).
d) Traction motors (1) & (2) which are prime movers in locomotive controlled from control panel (14).
e) Brake lever (15) to apply brake on rail wheels (3), (4), (5) & (6) through brake link (16), equalizer type mechanism (17) and brake shoes (7), (8), (9), & (10).
f) The braking system ensures the straight line movement of the push rod (13) when brake is applied or released.
2. The brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive, as claimed in claim 1, wherein when locomotive is in operation, the brake shoes (7), (8), (9), & (10) are not engaged on rail wheels (3), (4), (5) & (6), push rod (13) will be pressing the spring loaded lever (12) and limit switch (11) will be in ON position connecting the power supply from control panel (14) to traction motors (1) & (2).
3. The brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive, as claimed in claim 1, wherein when operator applies brake by rotating the brake lever (15) in anticlockwise direction, motion is transferred to brake link (16) in turn moves the push rod (13) in a straight line towards operator side thereby releasing spring loaded lever (12) of limit switch (11) to OFF position, the power supply from control panel (14) to traction motors (1) & (2) is isolated before the brake shoe (7), (8), (9), & (10) engages on rail wheels (3), (4), (5) & (6) respectively and further rotation of the brake lever (15) engages the brake shoe (7), (8), (9), & (10) on the rail wheels (3), (4), (5) & (6) respectively
4. The brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive, as claimed in claim 3 & 4, wherein the power isolation of traction series motors (1) & (2) happens just before brakes are engaged, overheating due to continuous inflow of current to motor which causes failure of motor windings are prevented.
5. The brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive, as claimed in claim 1, wherein the power isolation mechanism is integrated with braking system of locomotive just before the brake is applied and power supply is isolated to traction motor of flame proof battery locomotive whenever operator applies brake when locomotive is in operation.
6. The brake integrated power isolation mechanism for traction motor in flame proof battery operated locomotive, as claimed in claim 1, wherein the power isolation mechanism, which when operated, cuts off the electric supply to traction motor before brake is applied on locomotive wheels.