A hybrid arm aerial work vehicle

Abstract

The invention discloses a mixed arm overhead working automobile which comprises an automobile body assembly, a connecting rod type base arm, a transition connecting arm, a telescopic arm, a work platform leveling device and a work platform. The connecting rod type base arm of the four-connecting-rod structure comprises a supporting stand column, a base arm frame, a base arm connecting rod and a base arm amplitude changing oil cylinder. The work platform leveling device comprises a connecting rod type bent arm, a bracket, a bent arm amplitude changing oil cylinder, a first-stage leveling hydraulic cylinder and a second-stage leveling hydraulic cylinder. The connecting rod type bent arm of a double-four-connecting-rod structure comprises a first connecting frame, a first pull rod, a second pull rod and a second connecting frame. The double-four-connecting-rod structure can go across a dead point of the four-connecting-rod structure under the drive of the second-stage leveling hydraulic cylinder and can be spread in the reverse direction. According to the mixed arm overhead working automobile, stress of the base arm amplitude changing oil cylinder during work can be effectively reduced, the pulling-pressing conversion severe working condition of the base arm amplitude changing oil cylinder is eliminated, the service life of the base arm amplitude changing oil cylinder is prolonged, meanwhile, leveling flexibility and reliability are achieved, and the production cost is reduced.

Description

technical field [0001] The invention relates to an aerial work vehicle, in particular to a mixed-arm aerial work vehicle, which belongs to the technical field of special vehicles. Background technique [0002] With the rapid development of my country's economy and the rapid increase of vehicle traffic flow, the number of overpasses, ring viaducts and mountain tunnels, river tunnels or lake tunnels in the city is increasing day by day. A large amount of dust rolled up by driving vehicles is mixed together and finally attached to the walls, sound insulation screens and guardrails of overpasses, viaducts and tunnels. Over time, obvious stains are formed. The stains will not only affect the appearance, but also affect the lighting effect. Serious It even affects the driver's line of sight and thus affects driving safety. Usually, it is necessary to regularly clean and maintain the walls, sound insulation screens and guardrails to remove stains. [0003] Aerial work vehicle is a s...

AI Technical Summary

Problems solved by technology

[0005] 1. The length of the arm frame of the folding arm type aerial work vehicle is fixed, and it cannot realize the recycling of compact products with a small size, and the work target is reached only by the angle change of the arm frame during work. During the process, there is a movement of the lower arm against the action of the upper arm The impact is large, the target operating point cannot be reached quickly, and the operating efficiency is low. The lower arm luffing cylinder of the folding arm aerial work vehicle also has the problem of force-tension-compression conversion, which affects the reliability and service life of the oil cylinder;

[0006] 2. The telescopic arm of the telescopic boom type aerial work vehicle has insufficient space utilization, poor ability to cross obstacles, and the working mechanism cannot make up for the shortcomings of the overturning moment during operation;

[0007] 3. The ordinary hybrid arm structure also has the problem that the action of the lower arm has a great influence on the action of the upper arm. At the same time, due to the complex form of the arm frame of the ordinary hybrid arm type aerial work vehicle, it is usually not possible to directly use a mechanical leveling mechanism and a hydraulic linkage leveling mechanism. It is a leveling mechanism that uses sensors + hydraulic cylinders. This traditional hybrid arm leveling method has a high cost;

[0008] 4. The general mechanism type of ordinary aerial work vehicles is that the oil cylinder directly drives the luffing cylinder and the luffing action. The bending moment above the boom acts on the oil cylinder, and the oil cylinder is affected by the bending moment, the force changes greatly, and even pull- The case of pressure conversion

This method has high requirements on the strength, stability, and local quality of the cylinder, and it will increase the risk of wear, instability, and fatigue failure during operation. At the same time, the larger force also increases the size of the hydraulic cylinder. Affect the compactness of the vehicle

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