Load self-adaptive double-speed rotation system

Abstract

The utility model discloses a load self-adaptive double-speed rotation system which comprises an intelligent computing system, a controller, a hydraulic pump, a hydraulic motor, a multi-speed-ratio speed reducer and a rotation speed measuring device which are connected in sequence. The controller is sequentially connected with the brake control valve and the brake, the controller is directly connected with the brake at the same time, and the controller is connected with the monitoring alarm system; the hydraulic pump is sequentially connected with the hydraulic switching valve set, the hydraulic gear shifting assembly and the multi-speed-ratio speed reducer or the brake. The speed reducer is provided with the intelligent computing system and the monitoring alarm system, the double-speed ratio of the speed reducer is adjusted in a self-adaptive mode according to working conditions, the rotation speed adjusting range is enlarged, and the working efficiency is improved to the maximum degree on the premise that safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of cranes, in particular to a load-adaptive dual-speed slewing system. Background Art

[0002] Crawler cranes typically utilize a hydraulically driven slewing mechanism. The engine drives a hydraulic pump, which pumps hydraulic oil into a hydraulic motor to activate the mechanism. Speed ​​regulation and forward and reverse rotation are achieved by controlling the flow of fluid into the actuator (motor). The mechanism used to rotate the upper carriage in a crawler crane is called the slewing mechanism. It typically utilizes a reducer and slewing bearing, with large-tonnage cranes employing a dual reducer. The slewing system is the most important and fundamental system in a crane, and its operating speed directly impacts the overall crane's operating efficiency, particularly when operating with a load.

[0003] The design of the slewing mechanism often uses a high-speed hydraulic motor and reducer arrangement, where the slewing speed is determined by the motor displacement, system flow and reducer transmission ratio. The slewing mechanism rotates the upper vehicle along the axis to transfer the heavy load, so its slewing speed directly affects work efficiency. In order to improve the efficiency of slewing work, the invention patent with application number 201310675273.1 discloses a crane slewing speed control method. This method determines the maximum control current according to the current length and amplitude of the boom, and then outputs the corresponding standard current to the slewing pump to achieve the purpose of improving the slewing speed control accuracy; the invention patent with application number 201510385632.9 discloses a crane and its slewing speed control device and control method. This method collects the status of the engine, hydraulic pump and hydraulic motor according to the current working conditions, calculates the maximum operating speed of the slewing mechanism, and improves work efficiency; the invention patent with application number 202310006285.9 discloses a digital hydraulic control system for a slewing mechanism. The invention realizes digital hydraulic control through a mechanical closed-loop connection between a digital valve and a central rotating body, reduces the shaking and impact of the slewing mechanism, and improves the control accuracy and component service life of the slewing system.

[0004] In the design of a crane's slewing mechanism, to reduce slewing shock and ensure safe slewing with load, the maximum slewing speed is determined based on the rated load and the mechanism's load-bearing capacity. The above method has a certain effect on improving slewing speed and slewing speed control accuracy. However, in actual operation, objects that are less than the rated load are often hoisted. In this case, the slewing speed cannot reach the maximum operating speed allowed by the mechanism, affecting work efficiency.

[0005] Therefore, it is necessary to develop a new load-adaptive dual-speed rotation system to improve work efficiency. Utility Model Content

[0006] Purpose of the utility model: In response to the shortcomings and defects of the existing technology, the utility model provides a load-adaptive dual-speed rotation system, which is equipped with an intelligent computing system and a monitoring and alarm system. It can adaptively adjust the dual-speed ratio of the reducer according to the working conditions, increase the rotation speed regulation range, and maximize work efficiency while ensuring safety.

[0007] Technical solution: The utility model is a load-adaptive dual-speed rotation system, which is characterized by: comprising an intelligent computing system, a controller, a hydraulic pump, a hydraulic motor, a multi-speed ratio reducer and a rotation speed measuring device connected in sequence; the controller is connected to the brake control valve and the brake in sequence, the controller is directly connected to the brake at the same time, and the controller is connected to the monitoring alarm system; the hydraulic pump is connected to the hydraulic switching valve group, the hydraulic shift assembly, the multi-speed ratio reducer or the brake in sequence.

[0008] Wherein, a small gear is provided at the bottom of the multi-speed ratio reducer.

[0009] Wherein, the rotary speed measuring device is connected with the rotary support and the pinion.

[0010] Wherein, the rotary speed measuring device, multi-speed ratio reducer and hydraulic motor are located on the upper vehicle.

[0011] Wherein, the upper vehicle is located on the crane.

[0012] Wherein, the hydraulic pump is connected to the control operation panel.

[0013] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: The present invention is equipped with an intelligent computing system and a monitoring and alarm system. The intelligent computing system includes two intelligent controls: 1. Automatically or manually selecting the appropriate speed ratio according to the current working conditions; 2. Automatically rotating to the specified angle. The monitoring and alarm system includes: 1. Detecting the oil temperature of the reducer; 2. Detecting the vibration of the reducer; 3. Detecting the hydraulic oil level of the reducer; 4. Real-time monitoring of the rotation speed. The present invention adopts a dual-speed ratio reducer with a wider speed range. By adding an intelligent control system, it can automatically select the appropriate speed ratio according to the load, maximize the loaded rotation speed, improve work efficiency, and save energy. At the same time, the rotation system adds intelligent control and intelligent detection and alarm systems to pre-analyze early faults of the reducer and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is a schematic structural diagram of the pinion of the present invention;

[0016] Figure 3 This is a control flow chart of the utility model;

[0017] In the figure, 1 is the slewing bearing; 2 is the slewing speed measuring device; 3 is the multi-speed ratio reducer; 4 is the hydraulic motor; 5 is the upper carriage; and 6 is the pinion. DETAILED DESCRIPTION

[0018] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Abbreviations of this utility model: Slewing bearing: A bearing consisting of two parts, upper and lower, that can rotate relative to each other. Superstructure: The portion of a crane's slewing bearing that is located above the superstructure. Slewing system: The system that rotates the superstructure along its axis. Dual-speed ratio: Two transmission ratios. Slewing reducer: The slewing bearing drive. Motor: The reducer drive. Slewing speed measuring device: A device that measures the crane's slewing speed.

[0020] The load-adaptive dual-speed rotation system of the present invention includes an intelligent computing system, a controller, a hydraulic pump, a hydraulic motor 4, a multi-speed ratio reducer 3 and a rotation speed measuring device 2 connected in sequence; the controller is connected to the brake control valve and the brake in sequence, the controller is directly connected to the brake at the same time, and the controller is connected to the monitoring alarm system; the hydraulic pump is connected to the hydraulic switching valve group, the hydraulic shift assembly, the multi-speed ratio reducer 3 or the brake in sequence.

[0021] The multi-speed reducer 3 of this utility model is equipped with a pinion 6 at its base. The slewing speed measuring device 2 is connected to the slewing bearing 1 and the pinion 6. The slewing speed measuring device 2, the multi-speed reducer 3, and the hydraulic motor 4 are located on an upper carriage 5. The upper carriage 5 is located on the crane. The hydraulic pump is connected to the control panel.

[0022] During use, 1) the reducer and hydraulic motor are selected based on the overall required full-load rotation speed; 2) a dual-speed ratio is a reducer with two different transmission ratios, divided into a high transmission ratio and a low transmission ratio. The high transmission ratio can meet the overall required full-load rotation speed and is the transmission ratio used for rated load or close to rated load. The low transmission ratio is used when the load is unloaded or less than 50% of the rated load, at which time the maximum operating speed of the rotation system is increased; 3) the rotation speed measuring device is connected to the slewing bearing to collect real-time rotation speed. During control: 1) the current working conditions are collected, including parameters such as the lifting weight, amplitude, and the rotation resistance torque to be overcome during rotation, and the load condition of the slewing mechanism under the current working conditions is calculated. The load capacity of the slewing mechanism is checked, and the maximum rotation speed is finally determined. The system then changes the maximum speed limit; 2) the system adaptively adjusts the reducer transmission ratio based on the maximum rotation speed and motor performance; 3) the intelligent control system determines the optimal starting / braking time for the slewing mechanism, inputs the rotation end position, and the slewing mechanism operates automatically.

[0023] This utility model features an intelligent computing system and a monitoring and alarm system. The intelligent computing system includes two intelligent controls: 1. Automatic or manual selection of the appropriate speed ratio based on current operating conditions; 2. Automatic rotation to a specified angle. The monitoring and alarm system includes: 1. Speed ​​reducer oil temperature detection; 2. Speed ​​reducer vibration detection; 3. Speed ​​reducer hydraulic oil level detection; and 4. Real-time rotation speed monitoring.

[0024] This utility model uses a dual-speed reducer to transmit torque in the crane slewing system, expanding the operating speed adjustment range of the slewing mechanism. This solves the problem of poor crane speed regulation performance and reduces the design costs of components such as the hydraulic drive motor and engine while meeting performance requirements. A new dual-speed slewing control system is added. This system determines the maximum slewing speed based on the current crane operating conditions and the load the mechanism can withstand. It manually or automatically selects the appropriate transmission ratio and start / brake time to reduce engagement shock and maximize the operating efficiency of the slewing mechanism. The system can also automatically operate after inputting the slewing endpoint, enabling remote control. Intelligent detection and alarm technology is added to monitor the operating status of the slewing mechanism in real time, ensuring safe and stable operation of the equipment and extending the service life of the mechanism.

Claims

1. A load-adaptive dual-speed slewing system, characterized by: The invention comprises an intelligent computing system, a controller, a hydraulic pump, a hydraulic motor (4), a multi-speed ratio reducer (3) and a rotary speed measuring device (2) which are connected in sequence; the controller is connected in sequence to a brake control valve and a brake, the controller is directly connected to the brake at the same time, and the controller is connected to a monitoring alarm system; the hydraulic pump is connected in sequence to a hydraulic switching valve group, a hydraulic shift assembly, a multi-speed ratio reducer (3) or a brake.

2. The load-adaptive dual-speed slewing system according to claim 1, characterized in that: A small gear (6) is provided at the bottom of the multi-speed ratio reducer (3).

3. The load-adaptive dual-speed slewing system according to claim 2, characterized in that: The rotary speed measuring device (2) is connected to the rotary support (1) and the pinion (6).

4. The load-adaptive dual-speed slewing system according to claim 1, characterized in that: The rotary speed measuring device (2), the multi-speed ratio reducer (3), and the hydraulic motor (4) are located on the upper vehicle (5).

5. The load-adaptive dual-speed slewing system according to claim 4, characterized in that: The upper vehicle (5) is located on the crane.

6. The load-adaptive dual-speed slewing system according to claim 1, characterized in that: The hydraulic pump is connected to the control operation panel.

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