Progressive power system and heavy lifting and ramming equipment

Abstract

The utility model relates to the technical field of crane control discloses a kind of range increasing power system and hoisting dynamic compaction equipment, comprising: engine and hydraulic pump group, the output end of engine is connected with generator;Hydraulic pump group is connected with the output end of generator away from engine;The axis of rotation of engine, the axis of rotation of generator and the axis of rotation of hydraulic pump coincide. Through the above setting, the axis of rotation of generator and the axis of rotation of hydraulic pump coincide, generator can directly drive main pump and auxiliary pump to start under the action of electric power, without engine, to realize zero emission in operation process.

Description

Technical Field

[0001] This utility model relates to the field of crane control technology, specifically to a range-extended power system and a lifting and compaction equipment. Background Technology

[0002] With the global energy shortage becoming increasingly severe and environmental awareness growing stronger, green, low-carbon, and efficient energy utilization methods have become an important development direction in the construction machinery field. Traditional multi-functional crawler cranes generally use hydraulic transmission systems, with a diesel engine directly driving a hydraulic pump, which in turn drives the winch, traveling, luffing, and slewing actuators.

[0003] In recent years, construction machinery using range-extended hybrid power systems, such as range-extended dynamic compaction machines, has emerged on the market. These machines are typically equipped with a range-extending unit consisting of an engine and a generator, which drives an electric hoist mechanism via electricity generation, enabling electrification in some operating conditions. However, existing range-extending systems still have significant limitations in structural design and energy management: the range-extending motor is usually only used to drive the hoist system, while the hydraulic pump is still directly driven by the engine. This prevents the system from achieving pure electric drive of the hydraulic actuators without an external power source. Therefore, even in scenarios requiring pure electric power, the engine still needs to run continuously to provide hydraulic power, making it impossible to completely eliminate dependence on fuel and thus preventing truly zero-pollution operation. Utility Model Content

[0004] In view of this, the present invention provides a range-extended power system and a lifting and compaction equipment to solve the problem that even in pure electric demand scenarios, the engine still needs to run continuously to provide hydraulic power, which cannot completely get rid of the dependence on fuel and thus cannot achieve truly zero-pollution operation.

[0005] In a first aspect, this utility model provides a range-extending power system, comprising: An engine, the output of which is connected to a generator; A hydraulic pump assembly, wherein the hydraulic pump assembly is connected to the output end of the generator away from the engine; The axis of rotation of the engine, the axis of rotation of the generator, and the axis of rotation of the hydraulic pump coincide.

[0006] Beneficial effects: With the above settings, the generator's shaft axis coincides with the hydraulic pump's shaft axis. Under the action of electricity, the generator can directly drive the main pump and auxiliary pump to start, without the need for an engine, thus achieving zero emissions during the operation.

[0007] In one alternative implementation, a clutch is included, the clutch being mounted between the engine and the generator.

[0008] In one alternative embodiment, the hydraulic pump assembly includes: A main pump, one end of which is coaxially connected to the output end of the generator away from the engine; An auxiliary pump is coaxially connected to the end of the main pump that is furthest from the generator.

[0009] In one alternative embodiment, a first electrically controlled relief valve is installed on the main pump, and a second electrically controlled relief valve is installed on the auxiliary pump.

[0010] In one optional implementation, the range-extending power system further includes: A winch module, which is used to perform winch operations; Main controller; A first controller, one end of which is connected to the main controller and the other end of which is connected to the generator; The second controller is connected at one end to the main controller and at the other end to the hoisting module.

[0011] In one optional implementation, the hoisting module includes: A hoisting motor, which is connected to the second controller; A speed reducer is connected to the output end of the hoist motor, and a drum is driven to the output end of the speed reducer.

[0012] In one optional implementation, the range-extending power system further includes: A brake, which is mounted on the drum; An accumulator is connected to a hydraulic cylinder, and the output end of the hydraulic cylinder is connected to a brake.

[0013] In one alternative implementation, a check valve is installed between the accumulator and the main system oil circuit.

[0014] In one alternative implementation, the range-extending power system further includes a battery charging module, wherein the battery is connected to the main controller.

[0015] The charging module is connected to the main controller; the charging module can also be connected to an external charging device.

[0016] Beneficial effects: Through the five control modes described above, the engine operates within its high-efficiency range, resulting in high power generation efficiency and avoiding energy waste associated with traditional hydraulic systems during idling or light loads. Energy recovery during the lowering of heavy objects reduces overall system energy consumption and improves overall efficiency. Intelligent closing or adjustment of the electronically controlled relief valve reduces unnecessary hydraulic losses and enhances system response speed.

[0017] Secondly, this utility model provides a lifting and compaction equipment, including the aforementioned range-extending power system. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a range-extending power system according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of power transmission in the first control mode of the range-extended power system according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the power transmission in the third control mode of the range-extended power system according to an embodiment of the present utility model. Figure 4 This is a schematic diagram of the power transmission in the fourth control mode of the range-extended power system according to an embodiment of the present utility model. Figure 5 This is a schematic diagram of the power transmission in the fifth control mode of the range-extended power system according to an embodiment of the present utility model. Figure 6 This is a schematic diagram of the power transmission in the sixth control mode of the range-extended power system according to an embodiment of the present utility model. Figure 7 This is a schematic diagram of the power transmission in the seventh control mode of the range-extended power system according to an embodiment of the present utility model. Figure 8 This is a schematic diagram of the power transmission in the eighth control mode of the range-extended power system according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Engine; 2. Generator; 31. Main pump; 311. First electrically controlled relief valve; 32. Auxiliary pump; 321. Second electrically controlled relief valve; 4. Clutch; 51. Hoist motor; 52. Reducer; 53. Drum; 61. Main controller; 62. First controller; 63. Second controller; 71. Brake; 72. Accumulator; 73. Hydraulic cylinder; 74. Check valve; 8. Storage battery; 9. Charging module. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] With the global energy shortage becoming increasingly severe and environmental awareness growing stronger, green, low-carbon, and efficient energy utilization methods have become an important development direction in the construction machinery field. Traditional multi-functional crawler cranes generally adopt hydraulic transmission systems, with a diesel engine directly driving a hydraulic pump, which in turn drives the lifting, traveling, luffing, and slewing actuators.

[0023] In recent years, construction machinery using range-extended hybrid power systems, such as range-extended dynamic compaction machines, has emerged on the market. These machines typically feature a range-extending unit consisting of an engine (1) and a generator (2), which powers an electric hoisting mechanism, enabling electrification in some operating conditions. However, existing range-extending systems still have significant limitations in structural design and energy management: the range-extending motor is usually only used to drive the hoisting system, while the hydraulic pump is still directly driven by the engine (1), preventing the system from achieving pure electric drive of the hydraulic actuators without an external power source. Therefore, even in scenarios requiring pure electric power, the engine (1) must continue to operate to provide hydraulic power, making it impossible to completely eliminate dependence on fuel and thus preventing truly zero-pollution operation.

[0024] To solve the above technical problems, the following will be combined with... Figures 1 to 8 The following describes embodiments of the present invention.

[0025] According to embodiments of the present invention, on the one hand, such as Figures 1 to 8 As shown, a range-extending power system is provided, including: an engine 1, a generator 2, a hydraulic pump set, a clutch 4, a first electronically controlled relief valve 311, a second electronically controlled relief valve 321, a hoisting module, a main controller 61, a first controller 62, a second controller 63, a brake 71, an accumulator 72, a cylinder 73, a one-way valve 74, a battery 8, and a charging module 9.

[0026] The hydraulic pump assembly includes a main pump 31 and an auxiliary pump 32. The output shaft of engine 1 is connected to the shaft of generator 2 via clutch 4. The end of generator 2's shaft furthest from engine 1 is connected to the main pump 31, and the end of the main pump 31's shaft furthest from generator 2 is connected to the shaft of auxiliary pump 32. The shafts of engine 1, generator 2, main pump 31, and auxiliary pump 32 are coaxial. A first electrically controlled relief valve 311 is installed on the main pump 31, and a second electrically controlled relief valve 321 is installed on the auxiliary pump 32. Generator 2 is connected to a primary controller 62.

[0027] The winch module is used for winch operation, enabling the winding and unwinding of the wire rope, and thus the lifting and lowering of the load attached to one end of the wire rope. The winch module includes: a winch motor 51, a reducer 52, and a drum 53. The drum 53 can be a roller, etc. The winch motor 51 is connected to the secondary controller 63, and the output end of the winch motor 51 is connected to the shaft of the reducer 52. The end of the reducer 52 shaft away from the winch motor 51 is connected to the drum 53 for transmission. A brake 71 is installed on the drum 53, and an accumulator 72 is connected to a hydraulic cylinder 73. The output end of the hydraulic cylinder 73 is connected to the brake 71. A one-way valve 74 is installed between the accumulator 72 and the main system hydraulic circuit.

[0028] The range-extending power system also includes a battery 8 and a charging module 9. The battery 8 is connected to the main controller 61. The charging module 9 is connected to the main controller 61 and can also be connected to an external charging device.

[0029] A check valve 74 is installed between the accumulator 72 and the main system oil circuit.

[0030] The aforementioned range-extended powertrain system has multiple control modes: The first scenario, where no external power supply is available for lifting, involves the following process: like Figure 2 As shown, when the operator performs a lifting operation, the main controller 61 receives a command from the joystick or control panel. The main controller 61 then issues a command, engaging the clutch 4 and starting the engine 1. The engine 1 drives the generator 2 to generate electricity via the clutch 4. The alternating current generated by the generator 2 is rectified and regulated by the primary controller 62 to convert it into direct current, which is then supplied to the main controller 61. The main controller 61 performs power dispatching based on the power required by the hoist motor 51 and the state of charge of the battery 8, prioritizing the use of the power generated by the generator 2 to drive the hoist motor 51. If the generator 2 has surplus power, it charges the battery 8.

[0031] If the power demand of the hoist motor 51 momentarily exceeds the power of the generator 2, the battery 8 will simultaneously supply current to the main controller 61.

[0032] After the aforementioned current passes through the second controller 63, the second controller 63 converts the DC power into AC power, controlling the torque and speed of the winch motor 51. The winch motor 51 generates rotational power, and after the torque is increased by the reducer 52, it drives the drum 53 to rotate, completing the lifting operation of the heavy object.

[0033] The second type, without external power supply, operates as follows when no auxiliary actions (traveling, luffing, or slewing) are required under the first type of working condition: The main controller 61 continuously monitors the system status and detects when the operator does not give instructions for auxiliary actions such as walking, luffing, or slewing.

[0034] The main controller 61 immediately adjusts the overflow pressure setting values ​​of the first electrically controlled relief valve 311 and the second electrically controlled relief valve 321 to an extremely low level to reduce the overflow loss of the hydraulic system.

[0035] Because the load on the main pump 31 and auxiliary pump 32 becomes extremely light, the power required to drive the pumps is significantly reduced, allowing the majority of the output power of the engine 1 to be used to drive the generator 2 to generate electricity. The electrical energy generated by the generator 2 can more efficiently charge the battery 8 or be directly supplied to the hoist motor 51.

[0036] The third type, without external power supply, involves auxiliary actions (walking, luffing, or slewing) required in the first type of operation. The specific working process is as follows: like Figure 3 As shown, the first electrically controlled relief valve 311 and the second electrically controlled relief valve 321 on the main pump 31 and the auxiliary pump 32 are in a controlled standby state.

[0037] The operator issues an auxiliary action command, and the main controller 61 controls the first electrically controlled relief valve 311 and the second electrically controlled relief valve 321 to adjust the pressure set value.

[0038] Engine 1 drives generator 2 and hydraulic pump set simultaneously through the same shaft. Main pump 31 and auxiliary pump 32 start to output hydraulic oil. Main pump 31 and auxiliary pump 32 provide hydraulic power to the corresponding actuators. Main pump 31 can realize the crawler crane's travel and luffing, and auxiliary pump 32 can realize the crawler crane's rotation.

[0039] For the main pump 31 and auxiliary pump 32 circuits, when the pressure reaches the required level for rotation, the first electrically controlled relief valve 311 and the second electrically controlled relief valve 321 will open to limit the pressure, thereby saving the energy consumed by maintaining the pressure at an unnecessarily high level.

[0040] The fourth type, without external power supply, involves the following working process during the lowering of heavy objects: like Figure 4As shown, the hoist motor 51 operates in power generation mode, converting the potential energy of the heavy object into electrical energy. The drum 53 drives the hoist motor 51 to rotate and generate electricity through the reducer 52. The electrical energy is fed back to the battery 8 through the secondary controller 63 and the main controller 61, realizing energy recovery.

[0041] The main controller 61 sends a mode switching command to the secondary controller 63, switching the winch motor 51 from drive mode to generator mode. Under the influence of gravity, the load moves downward, causing the drum 53 to rotate. The rotation of the drum 53 is transmitted in the reverse direction to the shaft of the winch motor 51 through the reducer 52, driving the rotor of the winch motor 51 to rotate. The winch motor 51 generates electricity.

[0042] The secondary controller 63 rectifies the AC power generated by the motor into DC power and then supplies it to the main controller 61. The main controller 61 performs power dispatching based on the state of charge of the battery 8 and charges the battery 8 accordingly.

[0043] The fifth type requires no external power supply. When hovering in the air is required, the specific working process is as follows: like Figure 5 As shown, when the operator controls the hovering state, the clutch 4 is engaged, the main controller 61 controls the engine 1 to start and maintain it at a certain low speed, and the power of the engine 1 is simultaneously transmitted to the coaxial generator 2, main pump 31 and auxiliary pump 32.

[0044] The main controller 61 sends a signal to control the hydraulic oil from the auxiliary pump 32 to enter the cylinder 73 connected to the brake 71. The piston rod of the cylinder 73 extends, pushing the brake 71 to lock the drum 53. Simultaneously, the one-way valve 74 in the above structure ensures that the high-pressure oil in the accumulator 72 can only replenish the brake cylinder 73 in one direction, preventing backflow. Thus, even if the engine 1 is turned off or the hydraulic pump stops supplying oil, the accumulator 72 can maintain sufficient braking pressure for a long time, preventing heavy objects from falling and providing redundant safety protection.

[0045] Through the five control modes described above, engine 1 operates within its high-efficiency range, achieving high power generation efficiency and avoiding energy waste associated with traditional hydraulic systems during idling or light loads. Energy recovery during the lowering of heavy objects reduces total system energy consumption and improves overall efficiency. The electronically controlled relief valve intelligently closes or adjusts, reducing unnecessary hydraulic losses and enhancing system response speed.

[0046] The sixth type, when using an external power supply for lifting operations, follows the specific working process as follows: like Figure 6 As shown, an external power source (such as a charging pile) charges the battery 8 through the charging module 9, or directly powers the entire system.

[0047] The main controller 61 distributes power according to the power capacity of the external power supply, the state of charge of the battery 8, and the power requirements of the lifting operation, as follows: The external power supply has sufficient power. The main controller 61 prioritizes the allocation of power to the hoist motor 51. The main controller 61 outputs power to the second controller. The second controller 63 supplies power to the hoist motor 51. The hoist motor 51 drives the drum 53 to perform lifting operations through the reducer 52. If there is excess power, charge battery 8. Alternatively, when the power required by the hoist motor 51 exceeds the supply capacity of the external power supply, the battery 8 with electrical energy will directly transmit the electrical energy to the main controller 61. The main controller 61 will supply the electrical energy to the hoist motor 51 through the secondary controller 63. The hoist motor 51 will drive the drum 53 to perform lifting operations through the reducer 52. Alternatively, when there is no external power supply or the external power supply fails, the battery 8 alone transmits electrical energy to the main controller 61. The main controller 61 supplies electrical energy to the hoist motor 51 through the secondary controller 63. The hoist motor 51 drives the drum 53 to perform lifting operations through the reducer 52.

[0048] The seventh type has an external power supply. When auxiliary actions (such as walking, luffing, or slewing) are required, the working process is as follows: like Figure 7 As shown, the main controller 61 ensures that the clutch 4 is in the disengaged state, so that the engine 1 is completely disconnected from the generator 2.

[0049] The electrical energy input from the charging module 9 or the electrical energy from the battery 8 is delivered to the primary controller 62. The primary controller 62 controls the electric drive generator 2, which operates as a motor, consuming electrical energy and generating rotational power. As a motor, the generator 2 directly drives the main pump 31 and the auxiliary pump 32 to rotate, outputting hydraulic oil to achieve auxiliary actions (such as traveling, luffing, or slewing).

[0050] The main controller 61 sends commands to the first electrically controlled relief valve 311 and the second electrically controlled relief valve 321 respectively, according to the specific auxiliary action (such as walking, luffing or slewing), to set the relief pressure of their respective circuits to the required operating value.

[0051] The eighth type has an external power supply. During the lowering of heavy objects, the specific working process is as follows: like Figure 8 As shown, when the operator issues a lowering command, the hoist motor 51 operates in power generation mode, converting the potential energy of the heavy object into electrical energy. The drum 53 drives the hoist motor 51 to rotate and generate electricity through the reducer 52. The electrical energy is fed back to the battery 8 through the secondary controller 63 and the main controller 61, realizing energy recovery.

[0052] The main controller 61 sends a mode switching command to the secondary controller 63, switching the winch motor 51 from drive mode to generator mode. Under the influence of gravity, the load moves downward, causing the drum 53 to rotate. The rotation of the drum 53 is transmitted in the reverse direction to the shaft of the winch motor 51 through the reducer 52, driving the rotor of the winch motor 51 to rotate. The winch motor 51 generates electricity.

[0053] The secondary controller 63 rectifies the AC power generated by the motor into DC power and then supplies it to the main controller 61. The main controller 61 performs energy dispatching based on the state of charge of the battery 8, charging the battery 8 to achieve energy recovery.

[0054] Through the sixth to eighth operating conditions mentioned above, the engine is not running, achieving zero emissions during the operation.

[0055] Furthermore, noise is significantly reduced when operating in pure electric mode, improving the working environment.

[0056] According to an embodiment of the present invention, another aspect is provided: a lifting and compaction device including the above-mentioned range-extending power system, which has all its beneficial effects.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A range-extending power system, characterized in that, include: Engine (1), the output end of which is connected to generator (2); A hydraulic pump assembly is connected to the output end of the generator (2) away from the engine (1); The axis of rotation of the engine (1), the axis of rotation of the generator (2), and the axis of rotation of the hydraulic pump coincide.

2. The range-extending power system according to claim 1, characterized in that, include: Clutch (4), which is installed between engine (1) and generator (2).

3. The range-extending power system according to claim 1, characterized in that, The hydraulic pump assembly includes: The main pump (31) is coaxially connected to the output end of the generator (2) away from the engine (1); An auxiliary pump (32) is coaxially connected to the end of the main pump (31) away from the generator (2).

4. The range-extending power system according to claim 3, characterized in that, The main pump (31) is equipped with a first electrically controlled overflow valve (311), and the auxiliary pump (32) is equipped with a second electrically controlled overflow valve (321).

5. The range-extending power system according to claim 1, characterized in that, The range-extending powertrain also includes: A winch module, which is used to perform winch operations; Main controller (61); The first controller (62) is connected at one end to the main controller (61) and at the other end to the generator (2); The second controller (63) is connected at one end to the main controller (61) and at the other end to the hoisting module.

6. The range-extending power system according to claim 5, characterized in that, The hoisting module includes: A hoisting motor (51) is connected to the second controller (63); The reducer (52) is connected to the output end of the hoist motor (51), and the output end of the reducer (52) is connected to the drum (53).

7. The range-extending power system according to claim 6, characterized in that, The range-extending powertrain also includes: A brake (71) is mounted on the drum (53); An accumulator (72) is connected to a hydraulic cylinder (73), and the output end of the hydraulic cylinder (73) is connected to a brake (71).

8. The range-extending power system according to claim 7, characterized in that, A check valve (74) is installed between the accumulator (72) and the main system oil circuit.

9. The range-extending power system according to claim 5, characterized in that, The range-extending power system also includes: a battery (8) and a charging module (9), wherein the battery (8) is connected to the main controller (61); The charging module (9) is connected to the main controller (61); the charging module (9) can also be connected to an external charging device.

10. A lifting and compaction equipment, characterized in that, The range-extended power system included in any one of claims 1-9.

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