DESC:TECHNICAL FIELD
The present invention relates to a mechanical engineering. More particularly, the present invention relates to hydraulic system development and engineering for 950 HP giant dozer.
BACKGROUND
Hydraulic systems are extensively utilized across numerous fields, including but not limited to, agriculture, construction, and industry. These systems are often employed in heavy machinery for efficient transfer of power or force. Within the subset of heavy machinery, dozers, specifically high horsepower dozers, leverage hydraulic systems for various functions including steering, blade control, and transmission operations. These mechanical behemoths, such as a 950 HP dozer, require intricate hydraulic systems designed to withstand intense conditions and substantial workloads, while delivering excellent performance and reliability. Therefore, the progression of hydraulic systems in the realm of high horsepower dozers has perpetually been a topic of profound interest, urging continuous research and development. Notwithstanding the many advancements that have been achieved so far, there remains a perpetual pursuit for enhancement and innovation within this domain.

While noteworthy advancements have been made in hydraulic systems for heavy machinery, limitations persist. For instance, the adoption of electro-hydraulic and load-sensing technologies has brought about complexities in installation, maintenance and operation, demanding skilled attention. Integrated control systems have streamlined operations but their elevated costs raise accessibility issues. Telematics provide valuable data, but comprehensive utilization of that information is still lacking, and cyber-security concerns are becoming increasingly relevant.

Amid these limitations in the extant art, a need arises for an innovative solution that simplifies the operation and maintenance of hydraulic systems while delivering high performance and efficiency. The novel technology should also address issues of cost and security concerns associated with data utilization. By combining simplicity, performance, accessibility, affordability, and security, this anticipated development would contribute meaningfully to the ever-evolving landscape of heavy machinery hydraulic systems.
SUMMARY
One or more of the problems of the conventional prior art may be overcome by various embodiments of the present disclosure.

In one aspect of the present disclosure, a hydraulic control system for a 950 HP giant dozer includes a hydraulic joystick capable of performing various functions for controlling blade operations. This system also incorporates a single control valve controlled by hydraulic pilot signals. Furthermore, a pilot manifold block is present to distribute the hydraulic pilot signals, and a shut-off valve is integrated within this block to cease hydraulic oil supply to the joystick when the operator is not in the seat. An accumulator is also configured for emergency blade lowering situations when the engine is shut down.

In another aspect of the present disclosure, the hydraulic control system includes a hydraulic joystick that provides feather-touch control allowing for precise operation and manipulation of the bulldozer blade from the operator cabin.

In another aspect of the present disclosure, this invention is about a hydraulic control system where the control valve incorporates a main relief valve, a port relief valve, and an anti-cavitation valve. These components collectively help in regulating the hydraulic pressure and ensure safe operation within predefined limits.

In another aspect of the present disclosure, the hydraulic control system includes a pilot manifold block that regulates and manages the hydraulic pressure from the main pump before the hydraulic pressure is directed to the joystick.

In another aspect of the present disclosure, our invention additionally includes an emergency blade lowering system in the hydraulic control setup, which utilises stored energy for lowering the blade when the accumulator lacks pressure.

Another aspect of the present disclosure reveals that the hydraulic control system has a shut-off valve with a manual lever for locking the blade position to prevent unintended blade movement when the operator is not present in the seat.

In another aspect of the present disclosure, the control valve is designed to mindfully reduce the number of hose connections, thereby enhancing serviceability and reducing hydraulic system complexity.

In another aspect of the present disclosure, a method is provided for controlling the hydraulic system of a 950 HP giant dozer. This method includes activating a hydraulic joystick to control blade operations, directing pressurized hydraulic fluid through a control valve based on operator input, managing hydraulic pilot signals through a pilot manifold block, and cutting off hydraulic oil supply with a shut-off valve when the operator is not seated.

In another aspect of the present disclosure, the method further provides for the integration of a main relief valve, port relief valve, and an anti-cavitation valve within the control valve to maintain safe hydraulic pressure levels during operation.
BRIEF DESCRIPTION OF DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of this specification, show certain aspects of the subject matter disclosed herein and, together with the description, help explain some of the principles associated with the disclosed implementations. In the drawing,
Figure 1 illustrates an isometric view of the hydraulic system layout designed for a 950 HP Giant dozer, as disclosed herein.
Figure 2 illustrates the position of a joystick used to operate the blade attachment.
Figure 3 illustrates a pilot manifold block in accordance with the present disclosure.
Figure 4 illustrates a hydraulic circuit specifically designed for a 950 HP Giant dozer as described in this disclosure.
Figure 5 illustrates the flowchart, process, method, and diagram of the invention as disclosed.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Various embodiments of the disclosure are discussed in detail below. While specific implementations are discussed, it should be understood that this is done for illustration purposes only. A person skilled in the relevant art will recognize that other components and configurations may be used without parting from the spirit and scope of the disclosure. Thus, the following description and drawings are illustrative and are not to be construed as limiting. Numerous specific details are described to provide a thorough understanding of the disclosure. However, in certain instances, known details are not described in order to avoid obscuring the description.
References to one or an embodiment in the present disclosure can be references to the same embodiment or any embodiment; and, such references mean at least one of the embodiments.
Reference to "one embodiment", "an embodiment", “one aspect”, “some aspects”, “an aspect” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosure. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Moreover, various features are described which may be exhibited by some embodiments and not by others.
The terms used in this specification generally have their ordinary meanings in the art, within the context of the disclosure, and in the specific context where each term is used. Alternative language and synonyms may be used for any one or more of the terms discussed herein, and no special significance should be placed upon whether or not a term is elaborated or discussed herein. In some cases, synonyms for certain terms are provided.
A recital of one or more synonyms does not exclude the use of other synonyms.
The use of examples anywhere in this specification including examples of any terms discussed herein is illustrative only, and is not intended to further limit the scope and meaning of the disclosure or of any example term. Likewise, the disclosure is not limited to various embodiments given in this specification. Without intent to limit the scope of the disclosure, examples of instruments, apparatus, methods and their related results according to the embodiments of the present disclosure are given below. Note that titles or subtitles may be used in the examples for convenience of a reader, which in no way should limit the scope of the disclosure. Unless otherwise defined, technical and scientific terms used herein have the meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. In the case of conflict, the present document, including definitions will control.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or can be learned by practice of the herein disclosed principles. The features and advantages of the disclosure can be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the disclosure will become more fully apparent from the following description and appended claims or can be learned by the practice of the principles set forth herein.
As mentioned before, there is a need for technology that overcomes these drawbacks, such as lack of personalization diminishes the precision and reliability of the estimations. The present disclosure therefore provides a data processing system for determining death time of a subject by way of a regression equation.
Figure 1 illustrates an isometric view of the layout developed for hydraulic system for 950 HP Giant dozer, in accordance with an aspect of the present disclosure.
The system (100) may include joystick (102), main control value (104), pilot filter (106), shutoff valve (108), and pilot manifold block (110)
The system (100) includes a blade control joystick (102) for intuitive operator input, connected to the main control valve (104) responsible for regulating hydraulic flow. The hydraulic pilot signal is managed by a pilot manifold block (110) strategically positioned in the system, alongside a shutoff valve (108) and a pilot filter (106) to ensure optimal fluid cleanliness and control. These components are interconnected through hoses, creating a cohesive work equipment pilot control piping system. The innovative design replaces the older mechanically controlled system with a single 700 Lpm control valve, significantly reducing hydraulic connections and improving serviceability. The isometric view in Fig-01 illustrates the compact layout, emphasizing the efficiency and streamlined configuration of the hydraulic system for the 950 HP Giant Dozer's blade operations.
Figure 2 illustrates a joystick position for operating the blade attachment, in accordance with an aspect of the present disclosure.
The system (100) may include the joystick positions float (1), lower (2), hold (3), raise (4), R.H.tilt (5) and L.H.tilt (6).
Figure 3 illustrates a pilot manifold block, in accordance with an aspect of the present disclosure.
The pilot manifold block plays a crucial role in the hydraulic system, serving as the central hub for controlling the joystick operation. Pressurized oil from the hydraulic pump enters the manifold block through port P, and a pressure reducing valve lowers its pressure to 35 bar. The oil then flows through a check valve and into the joystick via port A, based on the joystick's movement. The joystick directs the oil to the respective pilot ports on the control valve, facilitating the operation of the main spools for blade control. Additionally, a safety shut-off valve within the manifold block allows the operator to cut off the oil supply to the joystick by placing the lever in the lock position, ensuring the prevention of unintended blade movement when the operator is away from the seat. This manifold block serves as a critical component for precise and controlled manipulation of the heavy machinery's blade functions.
Figure 4 illustrates a hydraulic circuit for 950 HP Giant dozer, in accordance with an aspect of the present disclosure.
The hydraulic circuit comprises a tandem pump, drawing oil from the hydraulic tank and feeding it through a junction block to the control valve. The larger pump directs oil to the control valve's P-line, while the smaller pump's output is merged with the larger pump's outlet via another junction block on the main control valve P-line. In neutral, oil from the pump circulates from the inlet port (P) to the tank port (T). The control valve, housing two spools for blade lift and tilt functions, receives pressurized oil from the joystick via a pilot manifold block, adjusting the main spools based on operator input. The blade lift spool, featuring four positions (Raise, Hold, Lower, Float), connects the main line oil to lift cylinders through ports A1 or B1. The blade tilt spool, with three positions (LH Tilt, Hold, RH Tilt), controls hydraulic lines to the tilt cylinder. Safety features include a main relief valve limiting pressure to 140 bar, a port relief valve managing excess pressure during operation, and an anti-cavitation valve. The manifold block also integrates a safety shut-off valve for cutting oil supply to the joystick, enhancing operator safety. Additionally, an accumulator, charged with Nitrogen gas, aids in lowering the blade when the engine is OFF by utilizing pressurized oil stored in the accumulator. This comprehensive hydraulic circuit ensures precise and secure control of blade movements in heavy machinery.
Figure 5 illustrates a flowchart, process, method, and diagram of the invention, in accordance with an aspect of the present disclosure.
The hydraulic system operates in a sequential process: the main pump, driven by the engine, draws oil from the hydraulic tank, with a tandem pump system facilitating two distinct flows – one from a large pump and the other from a small pump. The oil from the large pump is directed to the main control valve's P-line, while the small pump's output is merged with the large pump's outlet through a junction block on the main control valve. A pilot pump feeds oil to the manifold block, where pressure is reduced for joystick operation, enabling the proportional control of work attachment operations from the cabin. The joystick, drawing energy from the main pump, accumulator backup, and blade lift cylinder line, directs pilot operations to the main control valve, a pilot-actuated, proportional direction control valve. The control valve consists of two spools – Blade Lift Spool and Blade Tilt Spool – governing the lift and tilt cylinders, respectively. The hydraulic system ensures safe and controlled implement operations, with safety features like relief valves and an emergency blade lowering system. Finally, oil returns to the hydraulic tank via a main return junction block, completing the cycle and maintaining equipment functionality.
In one embodiment of the present invention, a hydraulic control system (100) for a 950 HP giant dozer includes a hydraulic joystick (102), a single 700 Lpm control valve (104), a pilot manifold block (110), a shut-off valve (108) and an accumulator. The hydraulic joystick (102) is configured to offer proportional pressure reducing valve functionality, which allows for the control of different blade operations including lifting, lowering, floating, left-hand tilt, and right-hand tilt. The role of the control valve (104) lies in directing pressurized hydraulic fluid to the required functions of the dozer's blade, in response to commands from the operator given through the hydraulic joystick (102).

The movement of hydraulic pilot signals from the hydraulic joystick (102) to the control valve (104) is facilitated by the pilot manifold block (110). The safety element is bolstered by the inclusion of a shut-off valve (108) within the pilot manifold block (110), which discontinues hydraulic oil supply to the hydraulic joystick (102) when the operator is no longer present in the seat. This embodiment also comprises an accumulator, which serves as storage of hydraulic pressure and comes into action for incidents of emergency blade lowering when engine shutdown occurs.

The control valve (104) integrates a main relief valve, a port relief valve, and an anti-cavitation valve. This integrated approach aids in regulating hydraulic pressure, maintaining operations within predefined safety limits. The hydraulic joystick (102) also lends precision to the dozer blade operation, carrying out a multitude of functions such as lift, lower, float, left-hand tilt, and right-hand tilt effectively from within the operator's cabin. Furthermore, the pilot manifold block (110) manages hydraulic pressure from the main pump, incorporates a pressure reducing valve, and regulates the hydraulic pressure to a consistent and safe 35 bar before directing it towards the hydraulic joystick (102). Finally, the shut-off valve (108) utilizes a manual lever to lock the blade position, preventing unintended blade movements when the operator seat is vacant. This hydraulic control system (100) is, thus, protective, efficient, and reliable.
The implementation set forth in the foregoing description do not represent all implementations consistent with the subject matter described herein. Instead, they are merely some examples consistent with aspects related to the described subject matter. Although a few variations have been described in detain above, other modifications or additions are possible. In particular, further features and/or variations can be provided in addition to those set forth herein. For example, the implementation described can be directed to various combinations and sub combinations of the disclosed features and/or combinations and sub combinations of the several further features disclosed above. In addition, the logic flows depicted in the accompany figures and/or described herein do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Other implementations may be within the scope of the following claims.
,CLAIMS:1. A hydraulic control system (100) for a 950 HP giant dozer, comprising:
a hydraulic joystick (102) configured to provide proportional pressure reducing valve functionality for controlling blade operations including lift, lower, float, left-hand tilt, and right-hand tilt;
a single 700 Lpm control valve (104) controlled by hydraulic pilot signals for directing pressurized hydraulic fluid to the respective functions of the bulldozer blade based on operator input from the hydraulic joystick (102);
a pilot manifold block (110) configured to distribute hydraulic pilot signals from the hydraulic joystick (102) to the control valve (104);
a shut-off valve (108) integrated within the pilot manifold block (110) to cut off hydraulic oil supply to the hydraulic joystick (102) when the operator is not in the operator seat;
an accumulator (not numbered) configured for emergency blade lowering in the event of engine shutdown, utilizing stored hydraulic pressure.
2. The hydraulic control system (100) as claimed in claim 1, wherein the hydraulic joystick (102) includes feather-touch control for precise operation of the bulldozer blade, enabling the operator to control blade up, down, float, left-hand tilt, and right-hand tilt functions from the operator cabin.
3. The hydraulic control system (100) as claimed in claim 1, wherein the control valve (104) integrates a main relief valve (not numbered), a port relief valve (not numbered), and an anti-cavitation valve (not numbered) for regulating hydraulic pressure and ensuring safe operation within predefined limits.
4. The hydraulic control system (100) as claimed in claim 1, wherein the pilot manifold block (110) is configured to manage hydraulic pressure from the main pump and includes a pressure reducing valve to regulate hydraulic pressure to 35 bar before directing it to the hydraulic joystick (102).
5. The hydraulic control system (100) as claimed in claim 1, further comprising:
o an emergency blade lowering system utilizing stored energy in the blade lift cylinder rod end when the accumulator lacks pressure, providing an alternative method for lowering the blade.
6. The hydraulic control system (100) as claimed in claim 1, wherein the shut-off valve (108) includes a manual lever for locking the blade position, preventing unintended blade movement when the operator is not present in the seat.
7. The hydraulic control system (100) as claimed in claim 1, wherein the control valve (104) is designed to reduce the number of hose connections, improving serviceability and minimizing hydraulic system complexity.
8. A method for controlling a hydraulic system (100) of a 950 HP giant dozer, comprising:
activating a hydraulic joystick (102) with proportional pressure reducing valve functionality to control blade operations including lift, lower, float, left-hand tilt, and right-hand tilt;
directing pressurized hydraulic fluid through a single 700 Lpm control valve (104) controlled by hydraulic pilot signals based on the operator’s input via the hydraulic joystick (102);
utilizing a pilot manifold block (110) to distribute hydraulic pilot signals to the control valve (104);
employing a shut-off valve (108) within the pilot manifold block (110) to cut off hydraulic oil supply to the hydraulic joystick (102) when the operator is not seated;
lowering the bulldozer blade using an accumulator when the engine is off or when other hydraulic pressure sources are unavailable.
9. The method as claimed in claim 8, further comprising integrating a main relief valve, a port relief valve, and an anti-cavitation valve within the control valve (104) to maintain safe hydraulic pressure levels during operation.