Double-power tower crane

Abstract

A double power tower crane, including a balance arm, the balance arm is provided with a counterweight, a power system box, a luffing mechanism, a lifting mechanism and a slewing assembly, the power system box provides power for the luffing mechanism, the lifting mechanism and the slewing assembly, the power system box is internally equipped with a modular power unit room, a diesel engine or a motor is compatiblely installed in the power unit room, the diesel engine or the motor is connected to a transfer case through a shaft coupling to drive multiple hydraulic pumps, and hydraulic oil is transported to an actuator through an external pipeline.The double power tower crane integrates a modular power system box at the end of the tower crane balance arm, a diesel engine or a motor can be compatiblely installed in the box as a power source, flexible switching between diesel drive and electric drive of a single tower crane is realized, the problems of poor cross-project adaptability, high repeated purchase cost and insufficient universality of traditional tower cranes are solved, and the economy and application range of the tower crane are improved.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically a dual-power tower crane. Background Technology

[0002] Tower cranes are key equipment in construction, widely used in housing construction, bridge construction, port construction, and other fields. Their core function is to achieve the vertical lifting and horizontal movement of heavy objects. Based on the power source, traditional tower cranes are mainly divided into three categories: pure electric tower cranes, diesel engine-hydraulic system combined drive tower cranes, and a few diesel-electric hybrid drive tower cranes.

[0003] Purely electric tower cranes rely on the power grid for power, with cables connecting the ground to the top of the crane. After being transformed, the cables drive the electric motor. The transmission principle is: electric motor → hydraulic pump → high-pressure oil pipe → hydraulic motor → reducer. However, as the height of the tower crane increases, cable laying becomes complex, time-consuming, and carries the risk of falling. Furthermore, high-altitude cables lead to increased voltage drop and power transmission losses, resulting in energy waste and weakening the motor's starting torque. They are also completely dependent on the power grid, making them unusable in areas without electricity, and the cable laying cost is also high.

[0004] The transmission principle of a diesel engine-hydraulic system combined drive tower crane is: diesel engine → hydraulic pump → high-pressure oil pipe → hydraulic motor → reducer. It does not rely on an external power grid and is suitable for remote areas without electricity. However, this type of tower crane requires a complex hydraulic control system. Currently, there are few compatible diesel engine models available domestically and internationally, increasing the difficulty of tower crane structural design and production cycle. The complex hydraulic pump pipeline design leads to a high failure rate, a large proportion of fuel consumption during idling, serious energy waste, high fuel consumption, poor economy, and significant noise, limiting its use in urban areas with environmental restrictions.

[0005] Diesel-electric hybrid drive tower cranes use a diesel generator set to supply power → drive motor → mechanical transmission mode. However, the dual energy conversion system has a complex structure and a high failure rate. In addition, the purchase cost of the generator set is high and the design has redundancy. When used in areas where power generation is not required, it causes unnecessary cost burdens, so its application is relatively rare.

[0006] The power systems of the three existing types of tower cranes are all fixed designs at the factory, which limits their adaptability to different scenarios: when a project moves from an area covered by the power grid to an area without electricity, electric tower cranes are forced to be idle; when diesel tower cranes enter urban environmentally restricted areas, they need to be shut down and modified before they can be used. In order to meet the power requirements of different projects, construction companies are forced to purchase two or more types of tower cranes, resulting in equipment utilization rates of less than 50%, causing serious problems of duplicate purchases and waste of resources.

[0007] Power system enclosure: A specially designed enclosure structure for mounting the power unit (diesel engine or electric motor), providing the power source for the tower crane. Transfer case: A device that distributes power, transmitting power from an engine or electric motor to different output shafts to drive multiple components. Summary of the Invention

[0008] To address the problems of poor cross-project adaptability, high repeated purchase costs, and insufficient versatility caused by the fixed power systems of existing tower cranes, this utility model provides a dual-power tower crane. Through modular design, it enables flexible switching of power modes, improves equipment utilization, reduces operating costs, and expands the scope of application.

[0009] This utility model is achieved through the following technical solution: a dual-power tower crane, including a counterweight, a power system box, a luffing mechanism, a hoisting mechanism, and a slewing assembly, wherein the power system box provides power to the luffing mechanism, the hoisting mechanism, and the slewing assembly; the power system box is equipped with a modular power unit compartment, which is compatible with the installation of a diesel engine or an electric motor, wherein the diesel engine or electric motor is connected to a transfer case via a coupling to drive a multi-channel hydraulic pump, and the hydraulic oil is delivered to the actuator through an external pipeline.

[0010] Furthermore, the hydraulic oil pump inside the power system box is connected to the hydraulic motor on the luffing mechanism via a hydraulic oil pipe. The hydraulic motor is connected to a reducer, and the reducer is connected to the actuator to complete the transmission.

[0011] The hydraulic pump inside the power system box is connected to the hydraulic motor on the lifting mechanism via hydraulic oil pipes. The hydraulic motor is connected to the reducer, and the reducer is connected to the actuator to complete the transmission.

[0012] The power system box includes a transfer case, a coupling, a diesel engine mounting base, a diesel engine, an electric motor mounting base, and an electric motor.

[0013] The transfer case is used to distribute the power output from the power source to multiple output shafts to synchronously drive multiple hydraulic oil pumps.

[0014] The output end of the diesel engine or electric motor is connected to the transfer case via a coupling, and the output end of the transfer case is connected to the hydraulic oil pump. The hydraulic oil pump is connected to the hydraulic motors of the luffing mechanism, the hoisting mechanism, and the slewing assembly via hydraulic oil pipes. The hydraulic motors are connected to the reducers, and the reducers are connected to the actuators via a transmission connection.

[0015] The diesel engine and electric motor are located in the same mounting area of ​​the power system box.

[0016] The installation positions and connection structures of the diesel engine mounting bracket and the electric motor mounting bracket are adapted to the corresponding power source installation requirements.

[0017] The output shafts of the diesel engine and the electric motor are at the same height, and the lower ends of the diesel engine and the electric motor are supported on the bottom plate of the power system box by the diesel engine mounting base and the electric motor mounting base, respectively.

[0018] The present invention has the following advantages: The dual-power tower crane of the present invention integrates a modular power system box at the end of the tower crane balance arm. The box can be compatible with the installation of a diesel engine or an electric motor as a power source, realizing the flexible switching between diesel drive and electric drive of a single tower crane. This solves the problems of poor cross-project adaptability, high cost of repeated purchases and insufficient versatility of traditional tower cranes, and improves the economy and applicability of tower cranes. Attached Figure Description

[0019] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the diesel engine installation in the power system box of this utility model; Figure 3 This is a schematic diagram of the motor installation in the power system box of this utility model.

[0021] In the diagram: 1. Power system box, 2. Luffing mechanism, 3. Hoisting mechanism, 4. Counterweight boom, 5. Counterweight, 6. Slewing assembly, 11. Transfer case, 12. Coupling, 13. Diesel engine mounting base, 14. Diesel engine, 15. Electric motor mounting base, 16. Electric motor.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figures 1 to 3 The illustrated dual-power tower crane includes a counterweight 4, on which a counterweight 5, a power system box 1, a luffing mechanism 2, a hoisting mechanism 3, and a slewing assembly 6 are mounted. The power system box 1 provides power to the luffing mechanism 2, the hoisting mechanism 3, and the slewing assembly 6. The power system box 1 is equipped with a modular power unit compartment, which can be compatible with the installation of a diesel engine or an electric motor. The diesel engine or electric motor is connected to a transfer case via a coupling to drive a multi-channel hydraulic pump, and the hydraulic oil is delivered to the actuator through external pipelines. This utility model of a dual-power tower crane includes a jib, tower body, counterweight jib, luffing mechanism, hoisting mechanism, slewing assembly, and counterweight. The core structure of the dual-power tower crane is a modular power system box at the end of the counterweight jib. The power system box contains a power unit compartment, which is compatible with installing a diesel engine or an electric motor as a power source. The output end of the power source is connected to a transfer case via a coupling, and the output end of the transfer case is connected to a hydraulic oil pump. The hydraulic oil pump is connected to the hydraulic motors of the luffing mechanism, hoisting mechanism, and slewing assembly via hydraulic oil pipes. The hydraulic motors are connected to a reducer, and the reducer is connected to the actuator for transmission.

[0027] like Figures 1 to 3 The illustrated dual-power tower crane has a hydraulic oil pump inside the power system box 1 connected to a hydraulic motor on the luffing mechanism 2 via a hydraulic oil pipe. The hydraulic motor is connected to a reducer, which is connected to the actuator to complete the transmission.

[0028] like Figures 1 to 3The illustrated dual-power tower crane has a hydraulic oil pump inside the power system box connected to a hydraulic motor on the hoisting mechanism 3 via a hydraulic oil pipe. The hydraulic motor is connected to a reducer, which is connected to the actuator to complete the transmission.

[0029] like Figures 1 to 3 The illustrated dual-power tower crane includes a power system box 1 comprising a transfer case 11, a coupling 12, a diesel engine mounting base 13, a diesel engine 14, an electric motor mounting base 15, and an electric motor 16. The transfer case 11 distributes power from the power source to multiple output shafts to synchronously drive multiple hydraulic pumps. The output ends of the diesel engine 14 or electric motor 16 are connected to the transfer case 11 via the coupling 12, and the output ends of the transfer case 11 are connected to the hydraulic pumps. The hydraulic pumps are connected via hydraulic oil pipes to the hydraulic motors of the luffing mechanism 2, the hoisting mechanism 3, and the slewing assembly 6, respectively. The hydraulic motors are connected to a reducer, and the reducer is connected to the actuators. During power transmission, after the diesel engine or electric motor starts, its output torque is transmitted to the transfer case via the coupling. The transfer case distributes power to the multiple hydraulic pumps, which generate high-pressure hydraulic oil, which is then transported via hydraulic oil pipes to the hydraulic motors of the hoisting mechanism, luffing mechanism, and slewing assembly. The hydraulic motor converts hydraulic energy into mechanical energy, which is then reduced and amplified by a reducer before being transmitted to the actuators to drive the tower crane to perform operations such as lifting, horizontal luffing, and slewing.

[0030] like Figures 1 to 3 The illustrated dual-power tower crane has a diesel engine 14 and an electric motor 16 housed within the same mounting area of ​​the power system housing 1. The mounting positions and connection structures of the diesel engine mounting base 13 and the electric motor mounting base 15 are adapted to the corresponding power source installation requirements. The housing of this invention adopts a universal design, with internally reserved power unit compartments that can accommodate the installation dimensions of both the diesel engine and the electric motor. Both the diesel engine and the electric motor are equipped with corresponding mounting bases, and the fixing holes and spacing of these bases match the connection structure of the power system housing, ensuring stable installation of both power sources.

[0031] like Figures 1 to 3The illustrated dual-power tower crane has the same shaft height at the output ends of the diesel engine 14 and the electric motor 16. The lower ends of the diesel engine 14 and the electric motor 16 are respectively supported on the base plate of the power system box 1 by the diesel engine mounting base 13 and the electric motor mounting base 15. In this invention, both the diesel engine and the electric motor are connected to a coupling. Since the coupling's installation position is fixed, the output shaft positions of the diesel engine and electric motor are also fixed. Therefore, during installation, the output shaft position must be used as the basis for installation, and the diesel engine mounting base and electric motor mounting base serve as supports to fix their positions. Specifically, the diesel engine mounting base and electric motor mounting base are support blocks of different heights. One end of each support block connects to the mounting feet of the diesel engine and electric motor, while the other end is fixed inside the power system box. This provides good fixation and support for the diesel engine and electric motor. Because the diesel engine mounting base and electric motor mounting base consist of multiple support blocks, they occupy a small volume and do not interfere with each other, thus not affecting the installation of the diesel engine and electric motor. This allows for compatible installation of the diesel engine and electric motor within the installation compartment and ensures that the entire power transmission system can operate normally and stably after changing the power unit. This enables the same tower crane to switch between different power types, solving the problem of poor versatility in traditional tower cranes.

[0032] This utility model discloses a dual-power tower crane. Power module replacement is achieved by disassembling the old power source from the coupling, removing the old power source, and then installing the new power source onto the corresponding mounting base and connecting it to the coupling. When the tower crane is used in an area without electricity, the power unit compartment of the power system box houses the diesel engine; when the tower crane is used in an area with electricity, the power unit compartment houses the electric motor. This achieves multi-purpose functionality, significantly improving the tower crane's environmental adaptability and avoiding resource waste. Specifically, when a construction project moves from an urban power grid coverage area to a remote area without electricity, the construction personnel first disconnect the electric motor from the coupling, remove the electric motor's fixing bolts, and move the electric motor out of the power unit compartment. Then, the diesel engine is hoisted onto the diesel engine mounting base, the fixing bolts are tightened, and the diesel engine output is connected to the transfer case input via the coupling. After checking the connection reliability, the system can be switched to diesel drive mode. Conversely, when moving from an area without electricity to an area with power grid coverage, the same process is followed to replace the old power source with an electric motor, switching to electric drive mode.

[0033] The dual-power tower crane of this utility model has the following beneficial effects: Enhanced versatility and adaptability: Through the compatible design of the modular power system box, a single tower crane can quickly switch between diesel drive and electric drive, adapting to different construction scenarios such as urban power grid coverage areas and remote areas without electricity, solving the cross-project usage limitations caused by the fixed power of traditional tower cranes.

[0034] Reduced equipment costs: Construction companies do not need to purchase multiple tower cranes for projects with different power requirements. They only need to equip themselves with one tower crane of this utility model and the corresponding power module, which greatly reduces equipment purchase expenditures. At the same time, it reduces equipment inventory and maintenance costs and improves capital utilization.

[0035] Improve equipment utilization: One tower crane can handle multiple power demand scenarios, avoiding the problem of traditional tower cranes being idle due to changes in project power. The equipment utilization rate is significantly improved, and resource waste is effectively reduced.

[0036] Optimize economic efficiency: Electric drive mode has low energy consumption and low pollution, which is suitable for urban environmental protection requirements; diesel drive mode does not rely on the power grid and is suitable for remote projects. Users can choose the optimal power form according to the scenario, achieving a balance between operating costs and environmental benefits.

[0037] This utility model breaks through the limitations of the traditional fixed power system of tower cranes by modularizing and universalizing the power system, realizing multi-scenario adaptation of a single unit, and significantly improving the practicality, economy and market competitiveness of tower cranes.

[0038] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0039] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A dual-power tower crane, characterized in that: The system includes a counterweight (4), on which a counterweight (5), a power system box (1), a luffing mechanism (2), a hoisting mechanism (3), and a slewing assembly (6) are mounted. The power system box (1) provides power to the luffing mechanism (2), the hoisting mechanism (3), and the slewing assembly (6). The power system box (1) is equipped with a modular power unit compartment, which is compatible with the installation of a diesel engine or an electric motor. The diesel engine or electric motor is connected to a transfer case via a coupling to drive a multi-channel hydraulic pump. The hydraulic oil is delivered to the actuator through an external pipeline.

2. The dual-power tower crane as described in claim 1, characterized in that: The hydraulic oil pump inside the power system box (1) is connected to the hydraulic motor on the luffing mechanism (2) through a hydraulic oil pipe. The hydraulic motor is connected to the reducer, and the reducer is connected to the actuator to complete the transmission.

3. A dual-power tower crane as described in claim 1, characterized in that: The hydraulic oil pump inside the power system box is connected to the hydraulic motor on the lifting mechanism (3) through a hydraulic oil pipe. The hydraulic motor is connected to the reducer, and the reducer is connected to the actuator to complete the transmission.

4. A dual-power tower crane as described in claim 1, characterized in that: The power system box (1) includes a transfer case (11), a coupling (12), a diesel engine mounting base (13), a diesel engine (14), an electric motor mounting base (15), and an electric motor (16).

5. A dual-power tower crane as described in claim 4, characterized in that: The transfer case (11) is used to distribute the power output from the power source to multiple output shafts to synchronously drive multiple hydraulic oil pumps.

6. A dual-power tower crane as described in claim 4, characterized in that: The output end of the diesel engine (14) or electric motor (16) is connected to the transfer case (11) via a coupling (12), and the output end of the transfer case (11) is connected to the hydraulic oil pump. The hydraulic oil pump is connected to the hydraulic motors of the luffing mechanism (2), the hoisting mechanism (3) and the slewing assembly (6) via hydraulic oil pipes. The hydraulic motors are connected to the reducer, and the reducer is connected to the actuator for transmission.

7. A dual-power tower crane as described in claim 4, characterized in that: The diesel engine (14) and the electric motor (16) are located in the same rotation area of ​​the power system box (1).

8. A dual-power tower crane as described in claim 6, characterized in that: The installation positions and connection structures of the diesel engine mounting bracket (13) and the electric motor mounting bracket (15) are adapted to the corresponding power source installation requirements.

9. A dual-power tower crane as described in claim 7, characterized in that: The output shafts of the diesel engine (14) and the electric motor (16) are at the same height. The lower ends of the diesel engine (14) and the electric motor (16) are supported on the bottom plate of the power system box (1) by the diesel engine mounting base (13) and the electric motor mounting base (15), respectively.

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