Rotary digital driving device

Abstract

The utility model discloses a rotary digital driving device, which belongs to the technical field of fluid transmission and comprises a digital motor, a speed reducing mechanism, a power source, a controller, a driver, a pipeline and an oil tank. An output shaft of the digital motor is mechanically connected with the input end of the speed reducing mechanism, and the output end of the speed reducer is mechanically connected with an upper vehicle rotating platform of the overhead working truck. The digital motor comprises a motor body, a digital valve and a motor; an oil inlet port and an oil return port of the digital valve are respectively connected to an output port of the power source and the oil tank through the pipeline; and two working ports of the digital valve are respectively connected to an oil inlet port and an oil return port of the motor body through the pipelines. By adopting the rotary digital driving device, the pressure impact in the rotary starting and braking processes of the overhead working truck can be effectively reduced, the accurate control of the rotary angle is realized, and the risk of traffic collision caused by the inaccuracy control of the rotating speed of the motor body is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluid transmission technology, and in particular to a rotary digital drive device. Background Technology

[0002] Aerial work platforms are specialized equipment used to transport personnel or equipment to predetermined heights for high-altitude operations. They are widely used in construction, municipal engineering, landscaping, and media engineering. The slewing mechanism, as one of the core functional components of the aerial work platform's working device, directly affects not only the work efficiency of construction workers but also the safety of both workers and equipment. Due to the unique nature of manned high-altitude operations, the state has set clear performance requirements for the overall stability, safety, and precise control of aerial work platforms and other specialized equipment.

[0003] Most existing aerial work platform slewing mechanisms use electro-hydraulic control hydraulic systems. When affected by external environmental factors or load characteristics during slewing, the control precision of the slewing mechanism deteriorates, the movement of the hydraulic actuators becomes unstable, and the vehicle body is prone to swaying. In addition, the "amplification" effect of each section of the robotic arm amplifies the swaying of the front-end work platform, which not only affects the work efficiency of construction workers but also threatens their personal safety.

[0004] The slewing mechanism of aerial work platforms often employs an electro-hydraulic control system with an added buffer valve. This system utilizes the buffer valve to reduce pressure shocks during slewing startup and braking, mitigating swaying and thus improving the stability of the front-end work platform. While this system has achieved some success in practice, it still has the following shortcomings.

[0005] The buffer valve cannot achieve real-time matching between the set pressure and the motion posture of the slewing mechanism. When the working device rotates in different postures, due to the fixed set pressure of the buffer valve, there will be a large pressure shock in the two chambers of the hydraulic motor under certain circumstances, resulting in obvious shaking of the entire vehicle.

[0006] In addition, existing slewing hydraulic systems are all electro-hydraulic control hydraulic systems, which are easily affected by external factors and load characteristics. They cannot accurately control the speed of the slewing motor, and thus cannot accurately control the slewing angle of the upper working platform, posing a risk of over-slewing and causing the working platform to collide with foreign objects. Summary of the Invention

[0007] The purpose of this invention is to provide a digital slewing drive device, which aims to effectively reduce the pressure impact during the start-up and braking process of the slewing platform on the aerial work platform, and realize the slow start and slow stop of the slewing device; at the same time, by utilizing the digital characteristics of the motion characteristics of the digital motor, it can achieve precise control of the slewing angle, reducing the risk of collision caused by the inaccurate control of the motor body speed.

[0008] To achieve the above objectives, this utility model provides a rotary digital drive device, which is installed on the upper rotary platform of an aerial work vehicle and includes a digital motor, a reduction mechanism, a power source, a controller, a driver, pipelines, and an oil tank.

[0009] Preferably, the digital motor includes a motor body, a digital valve, and a motor; the output shaft of the digital motor is mechanically connected to the input end of the reduction mechanism, and the output end of the reduction mechanism is mechanically connected to the slewing platform of the aerial work platform.

[0010] Preferably, a communication connection is established between the controller and the driver, and a communication connection is established between the driver and the motor.

[0011] Therefore, the present invention employs the aforementioned digital drive device for slewing, which can effectively reduce the pressure impact during the start-up and braking process of the slewing platform on the aerial work vehicle, and realize the slow start and slow stop of the slewing device; at the same time, by utilizing the digital characteristics of the motion characteristics of the digital motor, it can achieve precise control of the slewing angle, reducing the risk of collision caused by the inaccurate control of the motor body speed.

[0012] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an embodiment of a rotary digital drive device according to the present invention.

[0014] Figure Labels

[0015] 1. Upper slewing platform; 2. Reduction mechanism; 3. Piping; 4. Digital motor; 4-1. Motor body; 4-2. Digital valve; 4-3. Motor; 5. Controller; 6. Driver; 7. Power source; 8. Oil tank. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0017] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Example 1

[0019] like Figure 1 As shown, this utility model provides a slewing digital drive device, specifically applied to the slewing of an aerial work platform. The device includes an upper slewing platform 1, a reduction mechanism 2, a pipeline 3, a digital motor 4, a motor body 4-1, a digital valve 4-2, a motor 4-3, a controller 5, a driver 6, a power source 7, and an oil tank 8.

[0020] The inlet port P and return port T of digital valve 4-2 are connected to the output port P of power source 7 and oil tank 8 respectively via pipe 3. The two working ports A and B of digital valve 4-2 are connected to the inlet port A and return port B of motor body 4-1 respectively via pipe 3. The input end of power source 7 is connected to oil tank 8 to ensure the circulation of hydraulic oil in the entire oil circuit system.

[0021] A communication connection is established between controller 5 and driver 6, allowing controller 5 to send control signals to driver 6. A communication connection is also established between driver 6 and motor 4-3, enabling driver 6 to drive motor 4-3 to adjust digital valve 4-2 according to the received control signals.

[0022] The working principle of a rotary digital drive device in this embodiment is as follows: When the operator operates the controller 5, the power source 7 outputs pressurized oil to the oil inlet port P of the digital valve 4-2. The driver 6 receives the control signal from the operator and sends the corresponding number and frequency of pulses to the motor 4-3 according to the speed curve set in the program. The motor 4-3 opens the valve port of the digital valve 4-2 according to the number and frequency of pulses sent, allowing pressurized oil to enter the oil inlet port A of the motor body 4-1, thereby driving the rotary platform of the aerial work platform to rotate. The digital motor 4, through internal mechanical position closed-loop feedback, ensures that the valve opening of the digital valve 4-2 corresponds to the flow rate required for the programmed digital motor speed. With the displacement of the digital motor 4 unchanged, the rotation angle and speed of the digital motor 4 will correspond one-to-one with the number and frequency of pulses sent by the system, unaffected by external factors and load characteristics. The system controls the connection state between the working ports A and B of the digital valve 4-2 and the oil inlet port A and return port B of the motor body by rotating the motor 4-3 in different directions, thereby realizing the forward and reverse rotation of the rotary digital hydraulic system.

[0023] The number of pulses sent by the driver 6 corresponds to the rotation angle of the output shaft of the digital motor 4, and the pulse frequency corresponds to the rotation speed of the output shaft of the digital motor 4.

[0024] Therefore, the present invention employs the aforementioned digital drive device for slewing, which can effectively reduce the pressure impact during the start-up and braking process of the slewing platform on the aerial work vehicle, and realize the slow start and slow stop of the slewing device; at the same time, by utilizing the digital characteristics of the motion characteristics of the digital motor, it can achieve precise control of the slewing angle, reducing the risk of collision caused by the inaccurate control of the motor body speed.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A rotary digital drive device, characterized in that: The device is installed on the slewing platform of the aerial work vehicle and includes a digital motor, a reduction mechanism, a power source, a controller, a driver, pipelines, and an oil tank. The digital motor includes a motor body, a digital valve, and a motor; the output shaft of the digital motor is mechanically connected to the input end of the reduction mechanism, and the output end of the reduction mechanism is mechanically connected to the slewing platform of the aerial work vehicle. A communication connection is established between the controller and the driver, and a communication connection is established between the driver and the motor.

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