Constant-speed control device of multiple-protection agitating lorry

Abstract

The invention discloses a constant-speed control device of a multiple-protection agitating lorry, comprising a hydraulic pump, a hydraulic motor and a controller, wherein the hydraulic pump and the hydraulic motor are matched to use, a rotation-speed measuring instrument is arranged on a rotating shaft of a mixing drum, an electric-control proportion control valve is arranged on the hydraulic pump, and a hand operation mechanism is arranged on the electric-control proportion control valve. The constant-speed control device can avoid the deficiency in the prior art; the controller is used for collecting engine rotation-speed signals; the state of the electric-control proportion control valve is continuously regulated according to engine rotation-speed change; the mixing drum can keep ideal constant rotation speed in a transportation process whatever the change of the engine rotation speed of a transport lorry to prevent the metamorphism and the concretion of concrete and improve concrete transportation quality; the hand operation mechanism is arranged on the electric-control proportion control valve; and when the electric-control system of the whole device fails completely, the hand operation mechanism can ensure the rotation of a mixing tank to avoid the metamorphism of the concrete, and the like.

Description

technical field [0001] The invention relates to the field of concrete mixer trucks, in particular to a constant speed control device for multiple protection mixer trucks. Background technique [0002] Concrete mixer truck is a special equipment for concrete transportation. For the concrete mixing device on the mixer truck, its power source is generally divided into two types: 1. Independent power source, that is, a separate mixer power device is installed on the truck; 2. Hybrid power source, that is, sharing power with the chassis. Due to the high cost of using a separate power source, it is only used on a super-large-capacity transport vehicle, so most of the existing mixer transport vehicles share power with the chassis. During the concrete transportation process of the shared power transport vehicle, the stirring speed of the concrete mixing drum corresponds to the engine speed, that is, the speed of the mixing drum rises and falls with the rise and fall of the engine s...

AI Technical Summary

Problems solved by technology

This makes the transport vehicle have many deficiencies in the transportation process. For example, when the vehicle speed changes frequently due to changes in road conditions, the agitation speed of the mixing drum will also fluctuate, and the concrete flow in the drum will be uneven, which will easily damage the product. Concrete quality, and aggravate the wear of the spiral blade and cylinder, reducing the service life of the mixing drum; because the speed of the mixing drum is controlled by the throttle, the centrifugal force of the tank changes frequently, so that the frame is always under complex alternating loads, which will affect the auxiliary vehicle. Both the frame and the main frame are greatly damaged, which seriously affects the service life of the mixer truck frame; during the rapid acceleration of the vehicle, the agitation speed of the mixer drum changes rapidly, and the centrifugal tendency intensifies, which easily makes the driving stability of the vehicle Sexual deterioration, increased unsafe factors, etc.

In order to realize the constant rotation of the mixing drum, a constant speed controller for the rotating speed of the mixing drum is designed in the prior art, but in actual use, this kind of controller is prone to failure, once the controller fails, the normality of the rotation of the mixing drum cannot be guaranteed and continuity, it is easy to cause the concrete in the drum to segregate, solidify and other deterioration phenomena, and in severe cases, the mixing drum may even be scrapped

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