Double steel wheel road roller and frequency-converting vibration control device thereof

Abstract

The invention relates to the technical field of engineering machinery and discloses a double steel wheel road roller and a frequency-converting vibration control device thereof. The frequency-converting vibration control device comprises a first vibration motor and a second vibration motor which are serially connected with each other, wherein the first vibration motor is in parallel connection with a first split-flow branch; the flow, which flows by the first vibration motor, can be changed by the first split-flow branch; the second vibration motor is in parallel connection with a second split-flow branch; and the flow, which flows by the second vibration motor, can be changed by the second split-flow branch. In the frequency-converting vibration control device provided by the embodiment of the invention, a front vibration motor and a rear vibration motor are respectively in parallel connection with one split-flow branch so as to control the flow which flows by the front vibration motor or rear vibration motor, thereby controlling the vibration frequency of a front/rear wheel of the road roller, eliminating a beating vibration phenomenon, reducing power consumption, promoting road-rolling efficiency, being capable of adjusting the frequency of the front/rear wheel at any time by a vibration loop according to requirements, realizing various working states (multi-frequency double-amplitude) and expanding a use scope of the road roller.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a frequency conversion vibration control device for a double-drum road roller. The present invention also relates to a twin-drum road roller with the above-mentioned frequency conversion vibration control device. Background technique [0002] The vibratory hydraulic circuit is an important part of the hydraulic system of the vibratory roller, and its performance determines the use range and compaction effect of the vibratory roller. The actuator in the vibration hydraulic circuit is a vibration hydraulic motor, which directly drives the vibration shaft (that is, the central axis of the vibration wheel). When the road roller is working, the vibrating shaft drives a group of eccentric blocks on it to rotate at high speed to generate centrifugal force, forcing the vibrating wheel to generate a large shock force on the ground, forming a shock pressure wave, which propa...

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Problems solved by technology

[0003] At present, most of the control forms used for twin-drum rollers at home and abroad adopt closed hydraulic systems, mainly in the following two schemes: 1. A single circuit composed of two-point variable single pump, double quantitative motor (connected with single pump in series) and solenoid valve System, because the corresponding vibration frequency cannot be adopted according to the road conditions, the pressure road efficiency of this scheme is low, the energy consumption is large, and it is easy to cause the heat balance temperature of the hydraulic system to be too high, which reduces the reliability; 2. Two-point variable double pump and double quantitative The motor forms a dual-circuit vibration system, which is more independent than Scheme 1, but it also has the above-mentioned defects, and it costs more, takes up more space, and is more difficult to arrange pipelines

[0004] In addition, the circuit systems of the above two schemes can make the road roller work in three modes by controlling the actuator, namely all-wheel vibration, front wheel vibration and rear wheel vibration. Influenced by factors such as motor volumetric efficiency, pipeline pressure loss, and time difference, the vibration frequency of the front and rear wheels is slightly different by 5%, which is prone to "beat vibration" and affects the quality of road construction; in addition, for different compacted materials and paving Layer thickness, different vibration frequencies and amplitudes should be used to generate appropriate excitation force and compaction energy to obtain the best compaction effect, while the vibration frequencies of the above two schemes remain basically unchanged, which limits the road roller scope of use

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