FIELD OF THE INVENTION
The present invention relates to a hydraulic scrapping winch. More particularly, the present invention relates to a hydraulic scrapping winch assembly having provisions for hydraulic rotation of reel drum. Further this invention also has provision of rotating drum manually with a gear and pinion arrangement. Moreover, the winch assembly has a cross over relief valve to overcome cavitation effect in motor.

BACKGROUND OF THE INVENTION
A winch is basically a mechanical device used for winding/unwinding wire/rope on a drum, lifting and pulling the objects with a force during oil well operations. It is a mechanism that winds the wire around a reel drum that allows the controlled movement of objects without movement of the machine itself. The most popularly used winches are electric or hydraulic winches. Electric winch uses electric power directly from the generator whereas hydraulic winch uses hydro power to work and utilizes hydraulic pump and motor between the power generator set and winch. Hydraulic winch has numerous advantages such as it never overheats and has less weight. Moreover, the hydraulic winch has more pulling power and it never stalls with increasing torque.
US5692735A discloses a hydraulic winch assembly that can be attached to a vehicle's existing power steering and electrical system, enables effective and safe simultaneous operation of both the power steering system and winch, and one that is fail safe to both the host vehicle and human operator. US5842684A discloses a multi-speed winch attached to a motor vehicle and is hydraulically powered by the vehicle's power steering system or other hydraulic source innate to the host vehicle. The winch operates in either low-speed, high-torque mode for moving heavy loads, a high-speed, low-torque mode for quickly releasing or retrieving cable, a free-spooling mode for manually releasing cable and a brake mode for holding the cable and load at a fixed position. The high-speed mode is enabled by coupling the drive shaft directly to the winch drum. The low speed mode is enabled by coupling the drive shaft to the winch drum through a planetary gear assembly. The main drawback of the invention is that the single braking system is applied for holding the cable and load at a fixed position.
CN1740081A discloses a hydraulic contracting brake type double braking winch includes motor, gear box, drum and drum bearing seat, as well as work braking wheel and work braking brake arm on the containing shaft between the motor and the gear box, safety braking wheel and safety braking arm on the drum, and transverse pull rod and triangular lever hinged to the braking arm. The double braking winch features the hydraulic spring push rod hinged to the work braking brake arm and the hydraulic spring push rod hinged to the safety braking brake arm, with each of these two hydraulic spring push rods having the other end hinged to ground pull rod. The main drawback of the invention is that the double braking system is only operated in one mode.
In order to overcome the drawbacks of the prior arts, there is a need to develop a hydraulic scrapping winch which can rotate in both the directions with multiple speeds and can be operated both manually and hydraulically to provide an efficient power transmission.

OBJECT OF THE INVENTION
The main object of the present invention is to provide a hydraulic scrapping winch for lifting and pulling the loads, and for carrying out scrapping operation in the wells with high wax content on regular use of 6-8 hours approximately, and is for operations in a non hazardous area.
Another object of the present invention is to provide a hydraulic scrapping winch assembly with its reel drum rotating in both forward and reverse direction hydraulically and manually.
Yet another object of the present invention is to provide a winch assembly with a crossover relief valve to overcome cavitation effect.
Yet another object of the present invention is to provide a winch assembly with hydraulic oil cooler to maintain low temperature of oil in the system.
Yet another object of the present invention is to provide a winch assembly with a low displacement pump assembly running at high RPM to produce an efficient power transmission.
Yet another object of the present invention is to provide a winch assembly with its reel drum capable of being rotated hydraulically through gear box at different speeds using chain sprocket drive system or manually through gear and pinion arrangement.
Still another object of the present invention is to provide a measuring head to measure the length and/or tension of wire inside a well depending on type of measuring head used.

SUMMARY OF THE INVENTION
The present invention relates to a hydraulic scrapping winch. More particularly, the present invention relates to the hydraulic scrapping winch assembly with hydraulic rotation as well as manual rotation of its reel drum. Hydraulic rotation of drum is achieved by using hydraulic pump, hydraulic motor, gear box and double chain & sprocket system. Manual rotation of drum is achieved by using a pinion and gear arrangement. Moreover, the winch assembly has a cross over relief valve to overcome cavitation effect.
In a main embodiment, the present invention provides a hydraulic scrapping winch assembly comprising of an engine, a hydraulic pump, a hydraulic motor with a cross over relief valve, a gear box and a chain sprocket drive system, a reel drum, a gear and pinion arrangement, a hydraulic oil cooler and a measuring head. The engine is directly coupled to the hydraulic pump and the hydraulic pump is coupled to the reel drum through a hydraulic motor, a gear box and a double row chain to drive the reel drums. The hydraulic pump provides hydraulic power to supply oil to the hydraulic motor through the cross over relief valve. The cross over relief valve is also used to avoid cavitation effect i.e. jerk motion of the hydraulic motor due to sudden change in flow direction. The hydraulic motor transmits the hydraulic power to the reel drum through a gear box and a double row chain. The reel drum has two ends wherein one end has chain sprocket drive system to transmit the power from the hydraulic motor through a gear box to drive the reel drum in either forward or reverse direction at different speeds. The other end of the reel drum has the gear and pinion arrangement to avail the rotation of the reel drum manually in forward and reverse direction. Winch drum is rotated hydraulically by motor through gear box and a double row chain at different speeds in forward as well as in reverse direction. When needed, drum is rotated manually also by operating hand lever engaging pinion to gear which is attached with the drum. Pinion is disengaged by pulling shaft whenever manual rotation is not needed. The reel drum also has a dual brake band braking system with one brake band each on its either end, the dual band braking system operated by a hand lever for applying brake effectively. The hydraulic winch assembly is mounted on a trailer for easy handling and transportation. The trailer provides covering to protect the winch assembly from dust and rain.
In another embodiment, the present invention provides a strengthened reel drum, figure on reel drum assembly is included for additional details on the same. The reel drum is strengthened by supplying the core pipe with two outer rings. The core pipe is further strengthened by providing supports at both ends using cover plates as well as at centre using inner plate. The two cover plates and the inner plate are welded onto a shaft. The shaft is a solid bar resting on plumber bearings at the two ends. The core pipe is welded with end plates creating space for winding wire. Two brake band rings are mounted and welded over the ends of the core pipe to increase the strength of the core pipe and the reel drum. The brake band rings have a number of gusset plates to strengthen the winch assembly and the gusset plates have holes to mount gear at one side and sprocket at another side of the core pipe.
In yet another embodiment, the present invention provides a hydraulic tank in the winch assembly in which the return oil is routed from the hydraulic motor through the hydraulic oil cooler where the return oil gets cooled through air circulation by fan. The oil is being used for working of different hydraulic components such as pump, motor, valves which leads to increase in temperature of oil. The hydraulic oil cooler is used to maintain a low temperature of oil running in the winch assembly and reduces the maintenance cost of the hydraulic components. The hydraulic scraping winch uses open loop hydraulic system.
In still another embodiment, the present invention provides a measuring head consisting of measuring pulley, pressure pulleys, depth measuring counter, optionally a tensioner etc. It facilitates in measuring the length of wire entering into the bore or well indicating position/distance of loads/object from measuring device.

BRIEF DESCRIPTION OF THE DRAWING
An understanding of the device and method of the present invention may be obtained by reference to the following drawings:
Figure 1 shows the diagrammatic view of hydraulic scrapping winch assembly in accordance to the embodiment of the present invention.
Figure 2 shows details of reel drum assembly as used in hydraulic scrapping winch in the present invention.

DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described hereinafter in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough, and will fully convey the scope of the invention to those skilled in the art.

The present invention relates to a hydraulic scrapping winch. The winch system is powered by air cooled gasoline engine with an electrical starter and/ or by manual starter. More particularly, the present invention relates to a hydraulic scrapping winch assembly with a gear and pinion arrangement to avail a manual rotation of its reel drum. The present invention also relates to a hydraulic scrapping winch assembly with hydraulic pump, hydraulic motor, gear box and a double row chain to drive the reel drum hydraulically at different speeds one of the forward and reverse direction. The winch typically provides a line speed of 0- 350 m/min with a line pull of 1550 lbs. Moreover, the winch assembly has a cross over relief valve to overcome cavitation effect.
In a main embodiment, the present invention provides a hydraulic scrapping winch assembly 100 comprising of an engine 3, a hydraulic pump 2, a hydraulic motor 4 with a cross over relief valve, a gear box 5 and a chain sprocket drive system 6, a hydraulic oil cooler 10, a reel drum 9, a gear and pinion arrangement and a measuring head 11. The engine 3 is directly coupled to the hydraulic pump 2 which is a low displacement pump assembly working at high RPM to produce an efficient power transmission. The hydraulic pump 2 provides hydraulic power to supply oil to the hydraulic motor through the cross over relief valve. The cross over relief valve avoids cavitation effect i.e. jerky motion of the hydraulic motor 4 due to sudden change in flow direction. The hydraulic motor 4 transmits the hydraulic power to the reel drum 9 through a gear box 5, a chain and sprocket drive system 6 using double row chain. The reel drum 9 has two ends wherein one end has the gearbox 5 and chain sprocket drive system 6 to transmit the power from the hydraulic motor 4 at different speeds; and the other end has the gear and pinion arrangement to avail the rotation of the reel drum 9 manually in forward and reverse direction. The reel drum 9 also has a dual band braking system on its both ends operated by a hand lever 7 for applying brake effectively. The hydraulic winch assembly 100 is mounted on a trailer for easy handling and transportation. The trailer provides covering to protect the winch assembly from dust and rain.
In another embodiment, the present invention provides strengthened reel drum 9. The reel drum 9 is strengthened by supplying the core pipe 14 with two cover plates 17 and an inner plate 15, all the two cover plates 17 and the inner plate 15 are welded to a shaft 18. The shaft 18 is a solid bar which seats on two plumber bearings at the two ends. The core pipe 14 is welded with end plates creating space for winding wire. Two brake band rings 8 are mounted and welded over the ends of the core pipe 14 to increase the strength of the core pipe 14 and the reel drum 9. The brake band rings 8 have a number of gusset plates 13 to strengthen the winch assembly and the gusset plates 13 have holes to mount gear at one side and sprocket 16 at another side of the core pipe 14. The winch typically has drum capacity of 20,000 ft for 0.092” cable, and/ or 7,500 ft for 0.125” cable.
In yet another embodiment, the present invention provides a hydraulic tank 1 in the winch assembly in which the return oil is routed from the hydraulic motor 4 through the hydraulic oil cooler 10 where the return oil gets cooled through air circulation by fan. The oil is being used for working of different hydraulic components such as pump, motor, valves which leads to increase in temperature of oil. The hydraulic oil cooler 10 is used to provide cooling of the hydraulic oil and to achieve a low temperature in the range of 55-60°C for oil running in the winch assembly and reduces the maintenance cost of the hydraulic components.
In still another embodiment, the present invention provides a measuring head 11 consisting of measuring pulley, pressure pulleys, depth measuring counter, optionally a tensioner etc. The weight indicator in 0-2000 lbs is possibly provided with external load cell. It facilitates in measuring the length of wire entering into the well indicating position/distance of loads/object from measuring device.
The hydraulic scrapping winch assembly 100 has the hydraulic pump 2 directly mounted to the engine 3 to reduce the maintenance time and it utilizes the low displacement hydraulic pump 2 which runs at high RPM to provide an efficient power transmission.
Now referring to Figure 1, the present invention provides a hydraulic winch assembly 100 which comprises of a hydraulic tank 1, a hydraulic pump 2, an engine 3, a hydraulic motor 4, a reel drum 9, a gear box 5, a chain sprocket drive system 6 and a hydraulic oil cooler 10. The engine 3 is preferably a petrol engine directly coupled to drive the hydraulic pump 2. The direct coupling decreases the number of components used in between the engine 3 and hydraulic pump 2 which reduces the maintenance time and component cost. The hydraulic pump 2 is a low displacement pump running at high RPM provides an efficient hydraulic power to run the hydraulic motor 4 smoothly through a cross over relief valve (not shown in Figure 1). The hydraulic motor 4 transmits the mechanical power to the gear box 5. The gear box 5 is connected to the reel drum 9 through the chain sprocket drive system 6 to achieve the different speeds of the reel drum 9 and to increase the torque on the reel drum 9 to take sufficient load required to load or unload the equipment in the oil well bore. The measuring head 11 is connected to the reel drum 9 by the way of measuring pulley, pressure pulleys, depth measuring counter, also optionally a tensioner (not shown in Figure 1). It facilitates in measuring the length and/or tension of wire entering into the well indicating position/distance of loads/ object from measuring device. The control panel (not shown in the Figure 1) provides electrical control/engine controls, drum speed control, depth/ weight indicator, line pull control and a mechanical depth counter.
The reel drum 9 of the winch assembly runs hydraulically by hydraulic pump 2, hydraulic motor 4, gear box 5 and dual row chain and sprocket drive 6 and manually through the gear and pinion arrangement. The reel drum 9 has two ends 91, 92. The two ends 91, 92 comprises one end 91 has chain sprocket drive system 6 to transmit the power from the hydraulic motor 4 through the gear box 5 to drive the reel drum 9 in any one of the forward and reverse direction at different speeds. The other end 92 of the reel drum 9 has the gear and pinion arrangement to avail the rotation of the reel drum 9 manually in forward and reverse direction. Winch drum is rotated hydraulically by motor through gear box 5 and a double row chain at different speeds in forward as well as in reverse direction. When needed, drum is rotated manually also by operating hand lever 7 engaging pinion to gear which is attached with the drum. Pinion is disengaged by pulling shaft whenever manual rotation is not needed.
The double brake band rings 8 are mounted and welded on the core pipe 14. The double brake band rings 8 have gusset plates (not shown in Figure 1) and it is operated by a hand lever for its effective working and simultaneous operation of two brake bands. The gusset plates 13 are welded to the core pipe 14 and the double brake band rings 8 to strengthen the winch assembly. The gusset plates 13 have holes to mount gear at one side and sprocket 16 at another side of the core pipe 14.
The return oil from the hydraulic motor 4 is routed through the hydraulic oil cooler 10 to the hydraulic tank 1. The hydraulic oil cooler 10 is driven by the hydraulic motor 4 and is used to cool down the temperature of oil running in the winch assembly hence providing better efficiency of hydraulic components, reducing maintenance cost, reducing wear and tear and increasing the life of hydraulic components. The hydraulic scrapping winch assembly 100 is mounted on a trailer (not shown in Figure 1) for easy handling and transportation. The trailer provides the covering to protect the winch assembly from dust/rain.
Now referring to Figure 2, the present invention provides the reel drum assembly 9. The reel drum 9 consists of a core pipe 14 on which the rope is being wound. The core pipe 14 is strengthened by providing supports at both ends and has two cover plates 17 and an inner plate 15 welded to a shaft 18. The core pipe 14 is welded with end plates creating space for winding wire. The shaft 18 is a solid bar which seats on two plumber bearings at the two ends. Two brake band rings 8 are mounted and welded over the ends of the core pipe 14 to increase the strength of the core pipe 14 and the reel drum 9. The brake band rings 8 have a number of gusset plates 13 to strengthen the winch assembly and the gusset plates 13 have holes to mount gear 12 at one side and sprocket 16 at another side of the core pipe. The reel drum 9 also has a dual brake band braking system with one brake band each on its either end, the dual band braking system operated by a hand lever for applying brake effectively.
While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

CLAIMS:CLAIMS

We claim:
1. A hydraulic scrapping winch assembly (100) comprising:

a hydraulic tank (1) to store fluid;

an engine (3);

a hydraulic pump (2);

a hydraulic motor (4) rotated by the hydraulic pump (2);

a hydraulic oil cooler (10);

a gear box (5) connected with the hydraulic motor (4);

a chain sprocket drive system (6) linked with the gear box (5);

a measuring head (11); and

a reel drum (9);

wherein,
the engine (3) is directly coupled to drive the hydraulic pump (2);

the reel drum (9) is connected with the measuring head (11) and controlled by a control panel and the reel drum (9) comprises a pair of two ends (91), (92);

said one end (91) of the reel drum (9) is connected with the chain sprocket drive system (6) to transmit power from the hydraulic motor (4) through the gear box (5) to drive the reel drum (9) in any one of the forward and reverse direction at different speeds;

said other end (92) has a gear and pinion arrangement to manually drive the reel drum (9) in any one of the forward and reverse direction; and

said hydraulic pump (2) provides hydraulic power to supply oil to the hydraulic motor (4) through a cross over relief valve that also prevents cavitation effect.

2. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein the engine (3) is powered by one of the electrical starter and manual starter.

3. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein the hydraulic oil cooler (10) is driven by the hydraulic motor (4) to maintain low temperature in the range of 55-60°C for oil in the system.

4. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein the reel drum (9) is rotated manually by an operating hand lever (7) engaging pinion to gear which is attached with the reel drum (9).

5. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein the reel drum (9) has a dual brake band braking system with one brake band each on the one end (91), and the other end (92).

6. The hydraulic scrapping winch assembly (100) as claimed in claim 5 and claim 6, wherein the dual band braking system is operated by a hand lever for applying brake.

7. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein the control panel provides control on electrical components, engine, drum speed, depth indicator, weight indicator, line pull control, and a mechanical depth counter.

8. The hydraulic scrapping winch assembly (100) as claimed in claim 1 and 8,
wherein a line speed is 0-350 m/min with a line pull of 1500 lbs.

9. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein the hydraulic pump (2) is preferably a low displacement pump.

10. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein said assembly (100) has a drum capacity within the range of 20,000 - 21,000 ft for a cable ranging from 0.092 to 0.125.

11. The hydraulic scrapping winch assembly (100) as claimed in claim 1, wherein said measuring head (11) includes measuring units including but not limited to measuring pulley, pressure pulleys, depth measuring counter, a weight indicator and optionally a tensioner.