The brake system of mechanical single-drum road roller
(1) technical field
The present invention relates to a kind of stopping brake protection system of mechanical single-drum road roller.Belong to technical field of engineering machinery.
(2) background technology
Traditional mechanical single-drum road roller is to realize stopping brake by flexible axle brake activation device.Its drawback is that actuating force is big.The most important thing is that the operator is easy to forget before machining unclamps stopping brake, thereby causes parking brake to burn, and influences the parking safety.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, the brake system of little, the safe and reliable mechanical single-drum road roller of a kind of actuating force is provided.
The object of the present invention is achieved like this: a kind of brake system of mechanical single-drum road roller, comprise storage tank, brake control valve, drg, pressure switch and the controller for shifting that ends with lock, described drg comprises a cylinder and a spring, spring housing is contained on the piston rod of described cylinder, described storage tank links to each other with the brake control valve admission port, the control of braking valve air gate links to each other with the rodless cavity of the cylinder of drg, the rodless cavity of the cylinder of drg links to each other with pressure switch, the pressure switch control power supply that ends gearshift controller with lock, what described pressure switch adopted is pressure switch open in usual.
The invention has the beneficial effects as follows:
The present invention utilizes on the braking principle basis of dying, and inserts a pressure switch on brake control valve or brake cylinder, controls the controller for shifting that ends with lock by pressure switch and realizes the stopping brake protection.Actuating force is little, safe and reliable.
(4) description of drawings
Fig. 1 is the hydraulic schematic diagram of the brake system of mechanical single-drum road roller of the present invention.
Among the figure:
Storage tank 1, brake control valve 2, drg 3, pressure switch 4, the controller for shifting that ends 5 with lock, change speed gear box 6,24V power supply 7.
(5) specific embodiment
Referring to Fig. 1, Fig. 1 is the hydraulic schematic diagram of the brake system of mechanical single-drum road roller of the present invention.As seen from Figure 1, the brake system of mechanical single-drum road roller of the present invention mainly is made up of storage tank 1, brake control valve 2, drg 3, pressure switch 4, the controller for shifting that ends 5 with lock and change speed gear box 6.Described drg 3 comprises a cylinder 3.1 and a spring 3.2, spring 3.2 is sleeved on the piston rod of described cylinder 3.1, described storage tank 1 links to each other with brake control valve 2, brake control valve 2 links to each other with the rodless cavity of the cylinder 3.1 of drg 3, the rodless cavity of the cylinder 3.1 of drg 3 links to each other with pressure switch 4, the break-make of pressure switch 4 controls controller for shifting that ends 5 with lock and 24V power supply.Change speed gear box 6 is electric liquid shift change speed gear boxs, is used for changing the speed of a motor vehicle, and it is subjected to by controller for shifting 5 controls.What described pressure switch 4 adopted is pressure switch open in usual.
Principle of work:
Brake control valve 2 is pulled out, and the high pressure gas in the drg 3 are discharged into the atmosphere, and drg 3 is in braking mode under the effect of spring.At this moment, pressure switch 4 is in off-state, and the controller for shifting 5 that ends with lock is not communicated with 24V power supply 7, and the controller for shifting that ends 5 with lock is in lockup state, and gear shifting handle can't gear shift.Machine can't be walked.
Brake control valve 2 is depressed, made the gas of storage tank 1 flow into drg 3, braking is removed, while pressure switch 4 closures, the controller for shifting 5 that ends with lock is communicated with the controller for shifting that ends 5 releases with lock with 24V power supply 7, gear shifting handle can gear shift, and machine can be walked.
Annotate:
Among Fig. 1, the dotted line indication circuit; Solid line is represented gas circuit.