A master drive system and a control method thereof

Abstract

The application discloses a main driving system and a control method thereof, and belongs to the technical field of engineering drilling machines. In order to realize a hydraulic driving system with adjustable wide-range rotating speed and torque, the main driving system comprises a power source output module and a power output module. The power output module comprises a plurality of power output units. The plurality of power output units are a first power output unit and at least one second power output unit. The second power output unit comprises a control component (6) capable of controlling whether the second power output unit outputs power. The main driving system can realize multi-gear stepless speed regulation, has a large speed regulation and torque regulation range, automatically controls power distribution and clutching, has high energy efficiency, can be seamlessly switched without shutdown, has no impact, and has high reliability.

Description

Technical Field

[0001] This invention relates to the field of engineering drilling machinery technology, specifically to a main drive system and a control method for a main drive system. Background Technology

[0002] With the increasing demand and maturity of construction techniques such as rotary drilling, exploration, and excavation, rotary drilling rigs and various other drilling equipment are being used more widely. However, as the diameter and depth of mining drilling increase, the power requirements, speed range, and torque requirements of these equipment's power heads are also greater. In particular, some drilling processes employ the reverse drilling method of drilling first and then reaming, where high speed and low torque are required for pilot hole drilling, while low speed and high torque are required for reaming.

[0003] As the main driving component of a drilling rig, the power head mainly has two driving forms: electric drive and hydraulic drive. For example, Chinese patent CN215761470U, published on February 8, 2022, discloses a "Raising Drill Rig Drive Device" that uses a power head, an adjustable variable frequency drive head, and a fixed variable frequency drive head. The adjustable variable frequency drive head and the fixed variable frequency drive head are equidistantly distributed around the power head in a circumferential direction, which solves the problem of wide-range speed and power adjustment. Although electric drive has advantages in energy efficiency, it cannot be used due to its small volume density and space limitations, or environmental limitations of specific explosion-proof and protection levels. Therefore, hydraulic drive is often used. Summary of the Invention

[0004] To achieve a hydraulic drive system with a wide range of adjustable speed and torque, this invention provides a main drive system and its control method. The main drive system can achieve multi-speed stepless speed regulation, with a large range of speed and torque adjustment, automatic clutch control for power distribution, high energy efficiency, seamless switching without stopping, no impact, and high reliability.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A main drive system includes a power source output module and a power output module. The power source output module includes a hydraulic pump, a first main oil port, and a second main oil port. The hydraulic pump can output pressurized fluid from either the first or second main oil port. The power output module includes multiple power output units, each of which is connected to the first and second main oil ports. The multiple power output units are a first power output unit and at least one second power output unit. The second power output unit includes a control component that can control whether the second power output unit outputs power.

[0007] The power source output module contains multiple hydraulic pumps connected in parallel. The hydraulic pumps are closed-loop hydraulic variable pumps or closed-loop hydraulic fixed-displacement pumps. The power source output module also contains a replenishing pump, which can output pressurized fluid from a first main oil port or a second main oil port. The first oil supply port of the hydraulic pump is connected to the first main oil port, and the second oil supply port of the hydraulic pump is connected to the second main oil port.

[0008] The power source output module also includes a first overflow valve, a second overflow valve, and a third overflow valve. The oil outlet of the oil replenishment pump is connected to the oil inlet of the first overflow valve, the oil inlet of the second overflow valve, and the oil inlet of the third overflow valve. The oil outlet of the second overflow valve is connected to the first main oil port, and the oil outlet of the third overflow valve is connected to the second main oil port.

[0009] The second relief valve is connected in parallel with the first check valve. The outlet of the first check valve is connected to the first main oil port, and the inlet of the first check valve is connected to the oil outlet of the replenishing pump. The third relief valve is connected in parallel with the second check valve. The outlet of the second check valve is connected to the second main oil port, and the inlet of the second check valve is connected to the oil outlet of the replenishing pump.

[0010] The first power output unit includes a first hydraulic motor and a first gear. The first oil port of the first hydraulic motor is connected to the first main oil port, the second oil port of the first hydraulic motor is connected to the second main oil port, the output shaft of the first hydraulic motor is connected to the first gear, and the first hydraulic motor is a variable hydraulic motor or a fixed hydraulic motor.

[0011] The second power output unit also includes a shuttle valve, a two-way logic valve, a second hydraulic motor, a clutch, and a second gear, and the control component is a two-position four-way directional valve.

[0012] The first inlet of the shuttle valve is connected to the first main oil port, the second inlet of the shuttle valve is connected to the second main oil port, the outlet of the shuttle valve is connected to the oil port 1 of the two-position four-way directional valve, the oil port 2 of the two-position four-way directional valve is connected to the oil tank, the oil port 3 of the two-position four-way directional valve is connected to the control port of the two-way logic valve, and the oil port 4 of the two-position four-way directional valve is connected to the clutch engagement control port of the clutch.

[0013] The first port of the two-way logic valve is connected to the first main port, the second port of the two-way logic valve is connected to the first port of the second hydraulic motor, the second port of the second hydraulic motor is connected to the second main port, and the second hydraulic motor is a variable hydraulic motor or a fixed hydraulic motor.

[0014] The output shaft of the second hydraulic motor is connected to the input shaft of the clutch, and the output shaft of the clutch is connected to the second gear.

[0015] A control method for a main drive system, wherein the control method for the main drive system employs the aforementioned main drive system, and the control method for the main drive system includes the following steps:

[0016] The first power output unit outputs power, and the second power output unit is controlled to output power.

[0017] The beneficial effects of this invention are:

[0018] 1. Compared with existing technologies, the closed-loop multi-speed stepless speed regulation can obtain a main drive system with a wide range of speed regulation and multi-speed torque enhancement, which can meet the high speed and low torque construction requirements of small hole drilling, as well as the low speed and high torque working conditions of large hole drilling.

[0019] 2. Compared with existing technologies, the automatic clutch control for power distribution has higher transmission efficiency. At the same time, it automatically cuts off the motor oil supply, resulting in no energy loss. Moreover, it can switch seamlessly without stopping or impact, and has high reliability.

[0020] 3. The present invention has a large volumetric power density, a compact structure, and adopts a modular design, which is easy to combine. In addition, the system uses general and standardized components, which are of high quality, low cost, and high versatility. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of the main drive system described in this invention.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Hydraulic pump; 2. Make-up oil pump;

[0025] 11. First main oil port; 12. Second main oil port;

[0026] 31. First relief valve; 32. Second relief valve; 33. Third relief valve;

[0027] 41. First check valve; 42. Second check valve;

[0028] 5. Shuttle valve; 6. Control components; 7. Two-way logic valve;

[0029] 81. First hydraulic motor; 82. Second hydraulic motor;

[0030] 9. Clutch;

[0031] 101. First gear; 102. Second gear. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] A main drive system includes a power source output module and a power output module. The power source output module includes a hydraulic pump 1, a first main oil port 11, and a second main oil port 12. The hydraulic pump 1 can output pressurized fluid (such as hydraulic oil) from either the first main oil port 11 or the second main oil port 12. The power output module includes multiple power output units, each of which is connected to the first main oil port 11 and the second main oil port 12. The multiple power output units are a first power output unit and at least one second power output unit. The second power output unit includes a control component 6, which can control whether the second power output unit outputs power. Figure 1 As shown.

[0034] In this embodiment, the power source output module includes multiple hydraulic pumps 1 connected in parallel. Each hydraulic pump 1 can be a closed-loop hydraulic variable displacement pump or a closed-loop hydraulic fixed displacement pump. The first oil inlet of each hydraulic pump 1 is connected to a first main oil inlet 11, and the second oil inlet of each hydraulic pump 1 is connected to a second main oil inlet 12. To facilitate speed regulation, when the hydraulic pump 1 is a closed-loop hydraulic fixed displacement pump, it is connected to a variable frequency motor, meaning the closed-loop hydraulic fixed displacement pump is driven by a variable frequency motor. Closed-loop hydraulic variable displacement pumps can be controlled in various ways, including hydraulically controlled variable displacement and electrically controlled variable displacement.

[0035] In this embodiment, the power source output module further includes a replenishing pump 2, which can output pressurized fluid from the first main oil port 11 or the second main oil port 12. The inlet of the replenishing pump 2 is connected to the oil tank. The power source output module also includes a first overflow valve 31, a second overflow valve 32, and a third overflow valve 33. The outlet of the replenishing pump 2 is connected to the inlets of the first overflow valve 31, the second overflow valve 32, and the third overflow valve 33. The outlet of the first overflow valve 31 is connected to the oil tank, the outlet of the second overflow valve 32 is connected to the first main oil port 11, and the outlet of the third overflow valve 33 is connected to the second main oil port 12.

[0036] In this embodiment, the second overflow valve 32 is connected in parallel with the first check valve 41. The outlet of the first check valve 41 is connected to the first main oil port 11, and the inlet of the first check valve 41 is connected to the oil outlet of the replenishing pump 2. The third overflow valve 33 is connected in parallel with the second check valve 42. The outlet of the second check valve 42 is connected to the second main oil port 12, and the inlet of the second check valve 42 is connected to the oil outlet of the replenishing pump 2.

[0037] In this embodiment, the first power output unit includes a first hydraulic motor 81 and a first gear 101. The first oil port of the first hydraulic motor 81 is connected to the first main oil port 11, and the second oil port of the first hydraulic motor 81 is connected to the second main oil port 12. The output shaft of the first hydraulic motor 81 is coaxially connected and fixed to the first gear 101. Figure 1 As shown. The first hydraulic motor 81 includes, but is not limited to, a fixed-displacement hydraulic motor, and may also be a variable-displacement hydraulic motor, or a combination of a hydraulic motor and a reducer.

[0038] In this embodiment, the second power output unit further includes a shuttle valve 5, a two-way logic valve 7, a second hydraulic motor 82, a clutch 9, and a second gear 102. The control component 6 is a two-position four-way directional valve, preferably a two-position four-way solenoid directional valve. The second hydraulic motor 82 includes, but is not limited to, a fixed-displacement hydraulic motor, and may also be a variable-displacement hydraulic motor, or a combination of a hydraulic motor and a reducer.

[0039] The first inlet of shuttle valve 5 is connected to the first main oil port 11, the second inlet of shuttle valve 5 is connected to the second main oil port 12, the outlet of shuttle valve 5 is connected to the oil port 1 of the two-position four-way directional valve, the oil port 2 of the two-position four-way directional valve is connected to the oil tank, the oil port 3 of the two-position four-way directional valve is connected to the control port of the two-way logic valve 7, and the oil port 4 of the two-position four-way directional valve is connected to the clutch control port of the clutch 9. Figure 1 As shown. Clutch 9 can be either hydraulically controlled or electronically controlled.

[0040] The first port of the two-way logic valve 7 is connected to the first main port 11, and the second port of the two-way logic valve 7 is connected to the first port of the second hydraulic motor 82. The second port of the second hydraulic motor 82 is connected to the second main port 12. The output shaft of the second hydraulic motor 82 is coaxially connected and fixed to the input shaft of the clutch 9, and the output shaft of the clutch 9 is coaxially connected and fixed to the second gear 102. The clutch 9 is engaged and disengaged by a hydraulic pilot control, thereby disengaging and engaging the motor and the gear. The two-way logic valve 7 controls whether the hydraulic motor rotates. The hydraulic pump 1 provides a power source for the hydraulic motor. The replenishing pump 2 provides cooling and replenishing oil for the closed circuit.

[0041] The following describes the working process of the power source output module and the power output module in the main drive system (also known as a main drive system capable of speed and torque adjustment).

[0042] First power output unit:

[0043] After the hydraulic pump 1 (closed-loop hydraulic variable pump) changes direction in the first direction, it outputs high-pressure hydraulic oil from the first main oil port 11. The hydraulic oil enters the first oil port of the first hydraulic motor 81, driving the first hydraulic motor 81 to work. The first hydraulic motor 81 rotates in the forward direction, driving the first gear 101 to rotate synchronously. The first gear 101 is connected to the rotating body of the power head, thereby driving the rotating body of the power head to rotate. At this time, the first power output unit outputs power, such as... Figure 1 As shown.

[0044] Second power output unit:

[0045] After the hydraulic pump 1 (closed-loop hydraulic variable pump) changes direction in the first direction, it outputs high-pressure hydraulic oil from the first main oil port 11. The hydraulic oil passes sequentially through the first oil port and the second oil port of the two-way logic valve 7 and enters the first oil port of the second hydraulic motor 82, driving the second hydraulic motor 82 to work and rotate in the forward direction. The two-position four-way directional valve (control component 6) is not energized. At the same time, high-pressure hydraulic oil is output from the first main oil port 11, passing sequentially through the first inlet of the shuttle valve 5, the outlet of the shuttle valve 5, the oil port 1 of the two-position four-way directional valve (control component 6), and the oil port 4 of the two-position four-way directional valve, and then enters the clutch control port of the clutch 9, so that the clutch 9 is in the closed state. This causes the second hydraulic motor 82 to drive the second gear 102 to rotate synchronously. The second gear 102 is connected to the power head rotating body, thereby driving the power head rotating body to rotate. At this time, the second power output unit outputs power.

[0046] When the two-position four-way directional valve (control unit 6) is energized, port 1 of the two-position four-way directional valve is connected to port 3 of the two-position four-way directional valve, and port 2 of the two-position four-way directional valve is connected to port 4 of the two-position four-way directional valve. At this time, the high-pressure oil from the outlet of the shuttle valve 5 enters the control port of the two-position logic valve 7. The first port of the two-position logic valve 7 and the second port of the two-position logic valve 7 are not connected (not conductive). The high-pressure hydraulic oil output from the first main port 11 cannot enter the first hydraulic motor 81. As a result, the first hydraulic motor 81 has no oil supply and does not rotate, that is, the first hydraulic motor 81 stops working. At the same time, the clutch control port of the clutch 9 is connected to port 2 of the two-position four-way directional valve, port 4 of the two-position four-way directional valve and the hydraulic oil tank in sequence, thereby putting the clutch 9 in the disengaged state, causing the second hydraulic motor 82 to separate from the second gear 102. The second hydraulic motor 82 cannot drive the second gear 102 to rotate. At this time, the second power output unit does not output power.

[0047] Hydraulic pump 1 (closed-loop variable displacement pump) is a closed-loop variable displacement pump. Stepless speed regulation can be achieved by changing the flow rate of the high-pressure hydraulic oil output by the closed-loop variable displacement pump. The power head can be reversed by changing the direction of the variable displacement of hydraulic pump 1 (closed-loop variable displacement pump). For example, after hydraulic pump 1 is deviated in the second direction, high-pressure hydraulic oil is output from the second main oil port 12. The high-pressure hydraulic oil enters the second oil port of the first hydraulic motor 81 and the second oil port of the second hydraulic motor 82, causing both the first hydraulic motor 81 and the second hydraulic motor 82 to rotate in opposite directions. The control component 6 of each second power output unit can be controlled independently, thus allowing individual control over whether any one of the second power output units outputs power.

[0048] The following describes a control method for a main drive system. The control method for the main drive system adopts the above-mentioned main drive system and includes the following steps: causing the first power output unit to output power, and controlling whether any of the second power output units output power.

[0049] The number of hydraulic motors involved in the drive can be controlled via a two-position four-way directional valve (control component 6), a two-way logic valve 7, and a clutch 9, achieving multi-level speed and torque adjustment. Compared to gearbox speed regulation or frequency converter speed regulation, the adjustment range is increased several times for the same volume. Compared to traditional hydraulic variable speed regulation, the adjustment range is increased several times for the same power. Compared to a transmission hydraulic freewheel speed regulation system, the overall efficiency is increased by more than 5% for the same power.

[0050] The main drive system can achieve a wide range of speed adjustment and multi-level torque increase, which can meet the high speed and low torque construction requirements of small hole drilling, as well as the low speed and high torque requirements of large hole drilling. Moreover, it does not require stopping to adjust the speed and gears, and the reversing direction adopts closed-loop pump reversing, which provides stepless speed regulation and smooth reversing without impact. In addition, all the components used in the main drive system and method of this invention are mature and common parts, which are of high quality, high reliability, good versatility, and low cost.

[0051] Specifically, taking a main drive system with four gears as an example (in this case, the power output module includes four power output units, which are one first power output unit and three second power output units), the control method of the main drive system is described in detail:

[0052] Speed ​​and torque adjustment in gear 1: When hydraulic pump 1 is working, the first power output unit outputs power, and all three second power output units output power.

[0053] Two-speed and torque adjustment: When hydraulic pump 1 is working, the first power output unit outputs power, both second power output units output power, and one second power output unit does not output power.

[0054] 3-speed and torque adjustment: When hydraulic pump 1 is working, the first power output unit outputs power, one second power output unit outputs power, and neither of the two second power output units outputs power.

[0055] 4-speed and torque adjustment: When hydraulic pump 1 is working, the first power output unit outputs power, while the three second power output units do not output power.

[0056] The main drive system adopts a closed-loop multi-speed stepless speed regulation, which has the advantages of a large speed and torque adjustment range, automatic clutch control for power distribution, high energy efficiency, seamless switching without shutdown, no impact, and high reliability. The main drive system can drive vehicles with high volumetric power density, compact structure, modular design, convenient assembly, and uses universal and standardized components, resulting in high quality, low cost, and high versatility.

[0057] The main drive system may also have five or six gears. When it has five gears, the power output module may include five power output units, which are one first power output unit and four second power output units. When it has six gears, the power output module may include six power output units, which are one first power output unit and five second power output units.

[0058] The power output module can also have multiple first power output units. Each first power output unit works synchronously with the hydraulic pump 1; that is, when the hydraulic pump 1 is working, the first power output unit outputs power; when the hydraulic pump 1 is not working, the first power output unit does not output power. For example, the main drive system can also contain N gears, and the number of second power output units is N-1.

[0059] In this invention, the oil port 1 can also be referred to as oil port 1, interface 1, interface 1, first oil port, first interface, interface number 1, or oil port number 1; the oil port 2 can also be referred to as oil port 2, interface 2, interface 2, second oil port, second interface, interface number 2, or oil port number 2; the oil port 3 can also be referred to as oil port 3, interface 3, interface 3, third oil port, third interface, interface number 3, or oil port number 3; and the oil port 4 can also be referred to as oil port 4, interface 4, interface 4, fourth oil port, fourth interface, interface number 4, or oil port number 4.

[0060] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used together.

Claims

1. A main drive system, characterized in that, The main drive system includes a power source output module and a power output module. The power source output module contains a hydraulic pump (1), a first main oil port (11), and a second main oil port (12). The hydraulic pump (1) can output pressurized fluid from the first main oil port (11) or the second main oil port (12). The power output module contains multiple power output units. Each power output unit is connected to the first main oil port (11) and the second main oil port (12). The multiple power output units are a first power output unit and at least one second power output unit. The second power output unit contains a control component (6). The control component (6) can control whether the second power output unit outputs power. The second power output unit also includes a shuttle valve (5), a two-way logic valve (7), a second hydraulic motor (82), a clutch (9), and a second gear (102), and the control component (6) is a two-position four-way directional valve; The first inlet of the shuttle valve (5) is connected to the first main oil port (11), the second inlet of the shuttle valve (5) is connected to the second main oil port (12), the outlet of the shuttle valve (5) is connected to the oil port 1 of the two-position four-way reversing valve, the oil port 2 of the two-position four-way reversing valve is connected to the oil tank, the oil port 3 of the two-position four-way reversing valve is connected to the control port of the two-way logic valve (7), and the oil port 4 of the two-position four-way reversing valve is connected to the clutch control port of the clutch (9). The first port of the two-way logic valve (7) is connected to the first main port (11), the second port of the two-way logic valve (7) is connected to the first port of the second hydraulic motor (82), and the second port of the second hydraulic motor (82) is connected to the second main port (12).

2. The main drive system according to claim 1, characterized in that, The power source output module contains multiple hydraulic pumps (1) arranged in parallel. The hydraulic pump (1) is a closed-loop hydraulic variable pump or a closed-loop hydraulic fixed pump. The power source output module also contains a replenishing pump (2). The replenishing pump (2) can output pressurized fluid from the first main oil port (11) or the second main oil port (12). The first oil supply port of the hydraulic pump (1) is connected to the first main oil port (11), and the second oil supply port of the hydraulic pump (1) is connected to the second main oil port (12).

3. The main drive system according to claim 2, characterized in that, The power source output module also includes a first overflow valve (31), a second overflow valve (32) and a third overflow valve (33). The oil outlet of the oil pump (2) is connected to the oil inlet of the first overflow valve (31), the oil inlet of the second overflow valve (32) and the oil inlet of the third overflow valve (33). The oil outlet of the second overflow valve (32) is connected to the first main oil port (11) and the oil outlet of the third overflow valve (33) is connected to the second main oil port (12).

4. The main drive system according to claim 3, characterized in that, The second relief valve (32) is connected in parallel with the first check valve (41). The outlet of the first check valve (41) is connected to the first main oil port (11), and the inlet of the first check valve (41) is connected to the oil outlet of the replenishing pump (2). The third relief valve (33) is connected in parallel with the second check valve (42). The outlet of the second check valve (42) is connected to the second main oil port (12), and the inlet of the second check valve (42) is connected to the oil outlet of the replenishing pump (2).

5. The main drive system according to claim 1, characterized in that, The first power output unit includes a first hydraulic motor (81) and a first gear (101). The first oil port of the first hydraulic motor (81) is connected to the first main oil port (11), the second oil port of the first hydraulic motor (81) is connected to the second main oil port (12), and the output shaft of the first hydraulic motor (81) is connected to the first gear (101). The first hydraulic motor (81) is a variable hydraulic motor or a fixed hydraulic motor.

6. The main drive system according to claim 1, characterized in that, The second hydraulic motor (82) is either a variable hydraulic motor or a fixed hydraulic motor.

7. The main drive system according to claim 1, characterized in that, The output shaft of the second hydraulic motor (82) is connected to the input shaft of the clutch (9), and the output shaft of the clutch (9) is connected to the second gear (102).

8. A control method for a main drive system, characterized in that, The control method of the main drive system employs the main drive system as described in claim 1, and the control method of the main drive system includes the following steps: The first power output unit outputs power, and the second power output unit is controlled to output power.

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