Hydraulic control system for spray head of concrete wet spraying machine

Abstract

The invention provides a hydraulic control system for a spray head of a concrete wet spraying machine, and the hydraulic control system comprises a multi-way valve, a horizontal swing cylinder and a vertical swing cylinder which are connected with the multi-way valve, a control mode switching device is arranged between the multi-way valve and at least one swing cylinder, the control mode switchingdevice comprises a manual control oil path and an automatic control oil path, the automatic control oil path comprises a double-rod type displacement simulation cylinder which is connected with the swing cylinder in series and travel switches which are positioned at the tail ends of the strokes at two sides of a displacement simulation cylinder, the swing angle control of the swing cylinder is converted into the stroke control of the displacement simulation cylinder by the way that the oil returned by the swing cylinder enters the displacement simulation cylinder and drives the displacement simulation cylinder to move synchronously along with the swing cylinder, meanwhile, the travel switch is matched with a reversing valve to control the automatic switching of the oil inlet and outlet directions of the swing cylinder and the displacement simulation cylinder, so that the reciprocating motion of the swing cylinder is realized. The hydraulic control system for the spray head of the concrete wet spraying machine can realize automatic control of the swinging of the spray head, reduce repeated operation pressure and increase operation efficiency and safety.

Description

Technical field [0001] The invention belongs to the technical field of concrete spraying trolleys, and particularly relates to a hydraulic control system for the nozzle of a concrete wet spraying machine. Background technique [0002] Concrete spraying machine is a kind of engineering equipment widely used in underground engineering, geotechnical engineering, municipal engineering, tunnel excavation, mining rock drilling and other fields. Its working principle is to use high-pressure power to spray a mixture containing concrete, water and other additives The initial support is formed on the construction surface. Reliable support plays an important role in ensuring construction safety and improving construction quality. [0003] The existing concrete spraying machines are mainly divided into two types: wet spraying machines and dry spraying machines. Among them, the dry spraying machine first mixes the concrete with other additives (without water) and then puts it into the sprayer,...

AI Technical Summary

Problems solved by technology

[0007] 3. The rebound rate in the process of concrete wet spraying can be reduced to less than 10%, and the rebound degree is low;

[0011] In the above-mentioned spraying construction process, the operation of the spray head is basically realized by manual operation of the remote lever. The reciprocating frequency and swing angle of the swing cylinder depend entirely on the worker's feel and experience and on-site telephone communication. The accuracy and stability of the spraying operation cannot be guaranteed. Especially in the face of continuous large-scale operations, the unavoidable problem of artificial fatigue will seriously reduce the construction accuracy; even if the solution of installing a rotation sensor on the swing cylinder is adopted to monitor the swing angle, there is still a reverse action delay, angle The problem of inaccurate maximum position

In addition, it is often necessary to stop the swing control when adjusting the working surface, so that workers can free up their hands to operate the boom, which makes it difficult to improve working efficiency

Images