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 HYDRAULIC CONTROL DEVICE FOR EMERGENCY HOIST LOAD LOWERING IN A PIPE LAYER (CRAWLER CRANE)
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 hydraulic breaking device for off highway equipment. The present invention in particular relates to a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane).
DESCRIPTION OF THE RELATED ART:
[002] Pipe layer is basically off-highway equipment used for operation in Pipeline laying projects, construction sites, and open cast mines for conveyor shifting etc. Pipe layers are equipped with a side boom fitted with a forged type adjustable hook. The hook can be lowered/ raised at different speeds easily through wire ropes driven by hydraulic winches. The main function of the pipe layer is to handle a load at different boom overhang positions and carry it over long distances in the uneven and slushy mine sites. The machine is fitted with side boom & the load is held firmly by the crane hook on one side of the equipment.
[003] If the load in the hook is in lifted condition and if there is an emergency of equipment toppling or engine has stopped abruptly and engine fails to start again the load in hook needs to be dropped down safely against the gravity so that the load held by the hook is dropped down without any damage.
[004] Reference may be made to the following:
[005] Publication No. US3815478 relates to cable winding gear driven by a hydraulic motor of the kind having radial pistons driving a surrounding cam ring, a control is provided for applying differential pressure to the motor pistons so that they are disengaged from the cam ring which can then rotate freely. This provision enables the cable to be run out freely, so that, for example, in a crane free fall of the load can be allowed while avoiding damage to the motor. Pipe-laying equipment including the free-fall provision is described. Thus this is about free fall option in pipe layer winch, so that cable runs out freely to avoid the damage to motor where present invention a hydraulic control device is used during emergency to lower the load in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during vehicle breakdown.
[006] Publication No. CN213802610 discloses a crane hydraulic control device which comprises a crane body and a hoisting device, the hoisting device is fixed at the top of the crane body and comprises two first fixing plates, the top of the crane body is fixedly connected with a second fixing plate, and the second fixing plate is fixedly connected with the crane body. The first fixing plate and the second fixing plate are fixedly connected with the base, a rotating rod is rotatably connected in the first fixing plate and the second fixing plate, a winch is fixedly connected to the outer surface of the rotating rod, and a steel wire rope is arranged on the outer surface of the winch. Thus, this is about lifting safety device while lifting the load so that load is safely lifted without oscillating too much and provide safety to the worker around the crane.
[007] The present invention is about a hydraulic control device used during emergency, to lower the load in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during vehicle breakdown.
[008] Publication No. CN113148884 relates to an emergency power device and a crane winch emergency hydraulic control system. This is an emergency power device and a crane winch emergency hydraulic control system whereas present invention relates to a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane). The load lowering system during equipment toppling or engine breakdown is applicable to pipe layer with pilot control hydraulic system. The load lowering operation is controlled by means of hydraulic Stacked valve system and also with accumulator backup systems. The failure of engine or the existing system the control device upon operation by operator releases the service brakes of winch when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.
[009] Publication No. EP0118340 relates to a fluid control circuit wherein said fluid is preferably a hydraulic fluid or other similar fluid, as appropriate to the application, having a variety of emergency control safety features. The fluid control system is particularly adapted for use with lifting devices, especially cranes, for loading and unloading items to or from a moving platform. This system as described is typical of that which may be used on a crane having both a main hoist and an auxiliary or whip hoist both of which are used for independent and differing load applications. The control circuit is capable of automatically setting all of the load bearing brakes upon an electrical or/and hydraulic power failure. In addition, the control circuit provides a means for an operator to release the auxiliary or whip hoist, which is the smaller load bearing hoist, in an emergency situation where the line or hook on the auxiliary or whip hoist line becomes caught on a moving object. This is about overall hydraulic system for a crane for loading and unloading of load whereas BEML invention is about the load lowering system during equipment toppling or engine breakdown, is applicable to pipelayer with pilot control hydraulic system. The load lowering operation is controlled by means of hydraulic Stacked valve system and also with accumulator backup systems. The failure of engine or the existing system the control device upon operation by operator releases the service brakes of winch when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.
[010] Publication No. US2019337775 relates to the technical field of cranes, and in particular to a crane hydraulic control system and a crane. The crane hydraulic control system of the present disclosure includes a prime mover, an execution control mechanism, a hydraulic baking device, a running energy recycling device and an operation energy recycling device. By means of cooperation among the operation energy recycling device, the energy recovery device and the hydraulic energy conversion device, kinetic energy in a driving braking process of the crane and the potential energy in a load lowing process are respectively converted into hydraulic energy for recovery, storage and reuse, therefore, the present disclosure can achieve the recovery of the superstructure energy and the lower vehicle energy of the crane so as to effectively reduce the energy waste. This is about the recovery of the superstructure energy and the lower vehicle energy of the crane so as to effectively reduce the energy waste where as in present invention, a hydraulic control device is used during emergency to lower the load in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during vehicle breakdown.
[011] Publication No.SE0601134 relates to the hydraulic system is for damping vibration in a load-bearing crane and comprises a man oeuvre valve for operation of a piston cylinder with a lowering side and a lifting side. Also incorporated is a unit for registration of pressure in the piston cylinder unit and for signal generation. This unit is in the load bearing valve of the oven center type which is regulated by the generated signal via a signal pressure conduit from the piston cylinder unit lowering side. A safety valve is regulated by a signal pressure via a control pressure conduit from the piston cylinder lifting side. The system includes a cut-off valve fitted to the signal pressure conduit, which it closes when the pressure in the cylinder exceeds a previously determined value at which the pressure in the control pressure conduit increases and opens the safety valve. This is about hydraulic system for damping vibrations in load-bearing crane and comprises manoeuvre valve for operation of piston cylinder unit with lowering side and lifting side where as in present invention, a hydraulic control device is used during emergency to lower the load in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during vehicle breakdown.
[012] Publication No. JPH06255985 relates to enable the continuation of operation of a crane, even in the case where the operation system of the crane has failed, by providing the operation room with an electric main control system, and providing the machine body with a hydraulic driving system, and also by providing the machine body with a hydraulic emergency control system. An electric main control system is provided to an operation room, and a control stand 22 fitted with a joint-stick type control lever is provided to the front inside of the operation room. The driving system provided to the machine body is of a hydraulic type, and first to fourth winch drums 17 to 20 are driven by hydraulic motors 37 to 40 through speed reducers 33 to 36 respectively. On the machine body side, a control box 46 equipped with a hydraulic control valve is provided as an emergency control system. The control box 46 is housed so as to be freely drawn out from the machine body, and in the case where the main control system in the operation room cannot be used due to the failure of the electric system or the like, the driving system can be operated by operating the control box 46. This uses an alternatively electric main control system if hydraulic system fails during a crane operation whereas in present invention, a hydraulic control device is used during emergency to lower the load in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during vehicle breakdown.
[013] Publication No. EP1486681 relates to an electrohydraulic control device (S) for at least one hydraulic motor (H) on a mast or cantilever (M) of a lifting device (A) such as a concrete conveyor or mobile crane has for emergency re-setting of the control valve (V1-V4) an emergency coil connected to a power source isolated from the power supply of the working coil, externally on or in an extension of the working coil. An independent claim is included for a lifting device, especially a concrete conveyor or mobile crane. This is about electro-hydraulic control device and lifting apparatus where as in present invention, a hydraulic control device is used during emergency to lower the load in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during vehicle breakdown.
[014] Publication No. CN203754275 discloses an emergency release device for a crane. The emergency release device comprises a manual pump, a first throttle valve and a second throttle valve, wherein an oil outlet of the manual pump is communicated with a rod cavity of a brake cylinder through the first throttle valve; the second throttle valve is arranged on a pipeline between the first throttle valve and a brake control port X in a main oil-way of a hydraulic motor; the emergency release device also comprises an emergency release pipeline; two ends of the emergency release pipeline are respectively communicated with a first working port and a second working port of the hydraulic motor; a control valve for controlling on/off of the emergency release pipeline is arranged on the emergency release pipeline. The emergency release pipeline is arranged on the emergency release device between two working ports of the hydraulic motor, the control valve is arranged on the emergency release pipeline, two working ports of the motor can be directly connected through the control valve when manual emergency release needs to be carried out, and a pressure measuring line does not need to be manually connected. This is about emergency release device for a crane using a manual pump and a cylinder whereas present invention relates to a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane). The load lowering system during equipment toppling or engine breakdown is applicable to pipe layer with pilot control hydraulic system. The load lowering operation is controlled by means of hydraulic Stacked valve system and also with accumulator backup systems. The failure of engine or the existing system the control device upon operation by operator releases the service brakes of winch when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.
[015] Publication No. CN210193223 relates to an emergency control system of a crane. The device comprises a power supply, an electrical control cabinet, a valve and an emergency operation panel, the valves comprise a loading and unloading switching valve, supporting leg action valves and a suspension arm multi-way valve; the get-on and get-off switching valve controls hydraulic oil to flow to a get-on part or a get-off part, the supporting leg action valve controls the hydraulic oil to flow through a hydraulic oil way of the supporting leg, and the multi-way valve can control the hydraulic oil to flow through a hydraulic oil way of the suspension arm; the loading and unloading switching valve, the supporting leg action valves and the suspension arm multi-way valve are each provided with an electromagnetic valve, the electromagnetic valves are driven by voltage to control the electromagnets in the valve blocks to be powered on and powered off, when the electromagnets are powered on, the valve elements are pushed to the working state from the static state through force of the electromagnets, the hydraulic oil ways are connected, and the crane is controlled to conduct emergency action. This uses a electrical control system for emergency operation of a crane whereas present invention relates to a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane). The load lowering system during equipment toppling or engine breakdown is applicable to pipelayer with pilot control hydraulic system. The load lowering operation is controlled by means of hydraulic Stacked valve system and also with accumulator backup systems. The failure of engine or the existing system the control device upon operation by operator releases the service brakes of winch when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.
[016] Lifting/lowering and carrying of heavy materials in an open cast mine, where terrain is uneven and slushy is a challenging job. The above task will be having a direct bearing on the production activities and any delay will hamper the production. Also, while laying gas/oil pipelines, where two pipes are joined with accuracy, pipe layers are invariably required to lift/lower the heavy masses with proper control.
[017] During any lifting operation the load in the hook is in lifted condition and if there is an emergency of equipment toppling or engine has stopped abruptly and engine fails to start again the load in hook needs to be dropped down safely against the gravity so that the load held by the hook is dropped down without any damage.
[018] In order to overcome above listed prior art, the present invention aims to provide a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane). To properly and safely control the dropping down of load, a hydraulically controlled device is provided which helps to achieve the operation of safely lowering the load during emergency.
OBJECT OF THE INVENTION:
[019] The principal object of the present invention is to provide hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane).
[020] Another object of the present invention is to provide hydraulic control device for properly and safely control the dropping down of load.
[021] Yet another object of the present invention is to provide a hydraulically controlled device to achieve the operation of safely lowering the load during emergency.
SUMMARY:
[022] The present invention relates to a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane). The load lowering system during equipment toppling or engine breakdown is applicable to pipelayer with pilot control hydraulic system. The load lowering operation is controlled by means of hydraulic stacked valve system and also with accumulator backup systems. The failure of engine or the existing system the control device upon operation by operator releases the service brakes of winch when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed. This system is more reliable and ensures the load lowering operation at emergency conditions. The Emergency hoist load Lowering System provides operation safety to the equipment.
BREIF DESCRIPTION OF THE INVENTION
[023] 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.
[024] Figure 1, shows hydraulic stacked assembly valve, operated through a lever.
[025] Figure 2 shows hydraulic circuit for emergency load lowering system.
[026] Figure 3 shows flowchart according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION:
[027] The present invention provides a hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane). The load lowering system during equipment toppling or engine breakdown is applicable to pipelayer with pilot control hydraulic system. The load lowering operation is controlled by means of hydraulic Stacked valve system and also with accumulator backup systems. The failure of engine or the existing system the control device upon operation by operator releases the service brakes of winch when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed. This system is more reliable and ensures the load lowering operation at emergency conditions. The Emergency hoist load Lowering System provides operation safety to the equipment.
[028] Referring to figure 1, a hydraulic stacked assembly valve, operated through a lever, is provided to store the hydraulic energy in an accumulator. The Stacked assembly contains of pressure reducing valve and manual operated directional spool valve. It controls the start, stop & direction of a volume flow. The valve consists basically of the housing (1), the hand lever (2), the control spool (3) and return springs (4). In an un operated condition, the control spool (3) is held in the neutral or starting position by the return springs (4) or by detent. The control spool is pushed into the required control position by means of the hand lever. The operating pressure of the valve maintains higher than the pilot operating pressure. Figure 2 shows hydraulic circuit for emergency load lowering system.
[029] Figure 3 shows flowchart according to the present invention. In the pipe layer equipment with pilot operation control system, hook lifting and lowering operations are done through hydraulically operated winches. During lifting operation of hook pressure energy of hydraulic oil is tapped from 3mm diameter port from main pump delivery line. The higher pressure is reduced to required pressure in the stacked assembly.
[030] The hydraulic oil tapped from 3mm diameter pump line is passed through button filter in order to remove any contamination, in order to have a trouble free operation of hydraulic implements.
[031] The tapped hydraulic oil is stored using an accumulator and is used as a backup energy system to release the winch brake during emergency lowering of the load.
[032] PPC/ logic valves/ joystick is a proportional pressure reducing valve is used to control implement operations of hydraulic dozer. It is a feather touch control system device by means of which the operator can control all the operations of the implements from cabin. By actuating the feather touch joy stick, stored pressurized pilot oil from accumulator flows to winch brake port.
[033] Emergency load lowering operation in actuated at controlled speed by releasing hydraulic brake in the winch.
[034] An accumulator with a capacity of 2 litres and operating pressure of 50 bar, is used as storage of pressurized oil. If the load in the hook is in lifted condition and if there is an emergency of equipment toppling or engine has stopped abruptly and engine fails to start again the load in hook can be dropped down by using accumulator. When the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.
[035] The load lowering system during equipment toppling or engine breakdown is applicable to pipe layer with pilot controlled hydraulic system. The load lowering operation is controlled by means of hydraulic stacked valve system and also with accumulator backup systems. Failure of engine or the existing system, the control device upon operation by operator releases the service brakes of winch. When the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port. This flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed. This system is more reliable and ensures the load lowering operation during emergency conditions. The Emergency hoist load lowering system provides operation safety to the equipment.
[036] 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 hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane) comprises-
a) a hydraulic stacked assembly valve, operated through a lever, to store the hydraulic energy in an accumulator.
b) stacked assembly contains of pressure reducing valve and manual operated directional spool valve which controls the start, stop & direction of a volume flow characterized in that the valve consists of housing (1), the hand lever (2), the control spool (3) and return springs (4).
wherein in an unoperated condition, the control spool (3) is held in the neutral or starting position by the return springs (4) or by detent; control spool is pushed into the required control position by means of the hand lever and the operating pressure of the valve is maintains higher than the pilot operating pressure.
2. The hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane), as claimed in claim 1, wherein in the pipe layer equipment with pilot operation control system, hook lifting and lowering operations are done through hydraulically operated winches and during lifting operation of hook pressure energy of hydraulic oil is tapped from 3mm diameter port from main pump delivery line.
3. The hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane), as claimed in claim 1, wherein hydraulic oil tapped from 3mm diameter pump line is passed through button filter in order to remove any contamination, to have a trouble free operation of hydraulic implements.
4. The hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane), as claimed in claim 1, wherein tapped hydraulic oil is stored using an accumulator and is used as a backup energy system to release the winch brake during emergency lowering of the load.
5. PPC / logic valves/ joystick is a proportional pressure reducing valve is used to control implement operations of hydraulic dozer. It is a feather touch control system device by means of which the operator can control all the operations of the implements from cabin. By actuating the feather touch joy stick, stored pressurized pilot oil from accumulator flows to winch brake port.
6. Emergency load lowering operation in actuated at controlled speed by releasing hydraulic brake in the winch.
7. The hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane), as claimed in claim 1, wherein an accumulator with a capacity of 2 litres and operating pressure of 50 bar, stores pressurized oil and if the load in the hook is in lifted condition and if there is an emergency of equipment toppling or engine has stopped abruptly and engine fails to start again the load in hook can be dropped down by using accumulator; when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port and the flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.
8. The hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane), as claimed in claim 1, wherein the load lowering system during equipment toppling or engine breakdown is applicable to pipe layer with pilot controlled hydraulic system.
9. The hydraulic control device for emergency hoist load lowering in a pipe layer (crawler crane), as claimed in claim 1, wherein the load lowering operation is controlled by means of hydraulic Stacked valve system and also with accumulator backup systems and during failure of engine or the existing system, the control device upon operation by operator releases the service brakes of winch; when the stacked assembly valve lever is operated the charged oil in the accumulator flows to the stacked valve and is directed to the hook winch emergency brake release port; this flow of oil releases the hook winch brakes and allows the hook along with the load to drop in a controlled speed.