CN106809197A

CN106809197A - A kind of quarry tipper brake fluid system

Info

Publication number: CN106809197A
Application number: CN201510871860.7A
Authority: CN
Inventors: 田荣侠
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-02
Filing date: 2015-12-02
Publication date: 2017-06-09

Abstract

A kind of quarry tipper brake fluid system of the present invention, the characteristics of do not have idle stroke using brake piston, braking oil pressure rises rapidly, to improve the response speed of back axle brake pressure；The oil circuit pressure of introducing is less than the braking oil pressure from brake valve, therefore, one shuttle valve of addition compares both pressure, the switching of oil circuit when realizing braking；Because mine car releasing parking braking is used parking is released to pressure, in the middle of normal driving conditions, always filled with fluid in parking braking oil circuit, therefore this oil circuit can be introduced from parking braking oil circuit, the oil circuit of introduction enters the flow of plunger shaft by a damping control, and a check valve is used as counterbalance valve, there is provided 2bar pressure；Every hydraulic circuit is separately configured a power source, accumulator is respectively equipped with i.e. two loops and separated with check valve, the working method of the double circuit hydraulic braking valve in full power hydraulic brake system is realized, i.e., when wherein one loop is broken down, braking can be implemented separately by another loop.

Description

A kind of quarry tipper brake fluid system

Technical field

The present invention relates to a kind of quarry tipper brake fluid system, belong to vehicle hydraulic pressure system.

Background technology

China is to off-highway（It is mining）The long-term dependence on import of dumper, develops this product since 20 century 70s, is just taken on a certain scale until the nineties.It is off-highway（It is mining）Dumper is to peel off a kind of heavy-duty tipper used with Ore Transportation task to complete rock cubic metre of earth in surface mine, and its work characteristics is that length of run is short, carries weight, commonly use large-scale power shovel or hydraulic shovel is loaded, travels to and fro between digging point and unload ore deposit point.Here " off-highway " has no the implication of cross-country run, and simply because of its profile ultra-wide, gross mass excess is travelled not on highway.To the end of the year 2009, China's batch production is off-highway（It is mining）The enterprise of dumper has six or seven.

Since two thousand, as the economy of periphery neighbouring country of China and African various countries is developed rapidly, the demand of dumper maintains sustained and rapid growth, tens road dump truck Famous Construction Machinery Manufacturers are beached haul truck market one after another, country is for standard, the regulation also gradual perfection of dumper simultaneously, and standards system profile is gradually clear, and structure and content are also gradually in line with international standards, the strict demand to aspects such as safe and environment-friendly, human engineerings is embodied, it is off-highway（It is mining）The competition and development of dumper enter a brand-new epoch.

The content of the invention

It is existing off-highway in order to overcome（It is mining）Dumper front-rear axle responds nonsynchronous weak point and realizes the working method of double circuit hydraulic braking valve in full power hydraulic brake system, the present invention provides a kind of hydraulic system, the hydraulic system uses back pressure valve group, eliminate the idle stroke of brake piston, improve front-rear axle synchronism and improve vehicle safety, it is simultaneously that every loop is provided separately a power source, accumulator is respectively equipped with i.e. two loops and is separated with check valve, realize the working method of double circuit hydraulic braking valve.

The technical solution adopted for the present invention to solve the technical problems is：Using back pressure valve group, the idle stroke of brake piston is excluded, before braking is implemented, introduce an oil circuit to wet pan brake service brake plunger shaft, overcome service brake back-moving spring to move to idle stroke using this pressure and terminate, pressure value is 2bar；After implementing braking, braking fluid enters service brake plunger shaft, while this oil circuit being introduced into and plunger shaft are cut off, the characteristics of do not have idle stroke using brake piston, braking oil pressure rises rapidly, to improve the response speed of back axle brake pressure；Because the oil circuit pressure for introducing is less than the braking oil pressure from brake valve, therefore, one shuttle valve of addition compares both pressure, the switching of oil circuit when realizing braking；Because mine car releasing parking braking is used parking is released to pressure, in the middle of normal driving conditions, always filled with fluid in parking braking oil circuit, therefore this oil circuit can be introduced from parking braking oil circuit, the oil circuit of introduction enters the flow of plunger shaft by a damping control, and a check valve is used as counterbalance valve, there is provided 2bar pressure；Every hydraulic circuit is separately configured a power source, accumulator is respectively equipped with i.e. two loops and separated with check valve, the working method of the double circuit hydraulic braking valve in full power hydraulic brake system is realized, i.e., when wherein one loop is broken down, braking can be implemented separately by another loop.

The beneficial effects of the invention are as follows：Increased after counterbalance valve, the back axle braking response time is about 0.21s, essentially identical with the propons braking response time, after reducing the quantity of angle coupling, response speed is obviously improved；Accumulator evolutionary approach effectively solves the problems, such as that brakes single loop cannot implement braking when breaking down, and has realized truly double loop braking, improves the security of reliability and the mine car traveling of brakes.

Brief description of the drawings

The present invention is further described with reference to the accompanying drawings and examples.

Fig. 1 is to improve schematic diagram.

Fig. 2 is counterbalance valve schematic diagram.

Fig. 3 is not improve accumulator principle figure.

Fig. 4 is accumulator topping up improvement project figure.

1. steering junction in Fig. 1,2. hoisting system junction, 3. steering feedback, 4. hoisting system feedback, 5. special accumulator feedback signal.

1. hydraulic valve in Fig. 3,2. braking in a turn valve group, 3. accumulator, 2.1 priority unloading valves, 2.2 cold start-up valves, 2.3-2.5 shuttle valves.

Specific embodiment

In Fig. 1, principle is improved as shown in figure 1, in the A of double dot dash line region, shuttle valve, check valve, damping and filter screen are integrated in the middle of a valve block, as back pressure valve group, filtered using the filter screen in valve group into the fluid cleaning after damping, prevent from being blocked at damping.

In fig. 2, back pressure valve group is arranged on and is braked near threeway near back axle, meanwhile, by shuttle valve horizontal positioned in valve group, to reduce the influence that gravity works valve element；Reduce the quantity and length of sebific duct in back axle brake piping, and use steel pipe replacement instead.

Preferably, it is straight coupling the original angle coupling in back axle brake circuit to be changed.

In figure 3, start engine, controller (ECU) control cold start-up valve 2.2 is powered, system feedback oil circuit is connected by cold start-up valve 2.2 with fuel tank, system is in unloading condition, and the dead electricity of cold start-up valve 2.2 after 5 seconds, feedback oil circuit is connected with hydraulic pump 1, hydraulic pump 1 starts to give the topping up of accumulator 3, and feedback oil circuit trend is as shown in thick dashed line in figure；The overflow portion of priority unloading valve 2.1 is opened, and to fuel tank, hydraulic pump 1 loses feedback signal, and pumpage and pressure are rapidly reduced to armed state, and accumulator topping up terminates for feedback oil circuit off-load；In braking procedure, as direct driving force source for brakes provides energy, its internal pressure is also reduced accumulator, and dropped in pressure limited unloading valve higher limit 85% when, off-load valve overflow portion is closed, and feedback oil circuit is reclosed, and load sensitive pump regains pumpage and pressure accordingly rises, again accumulator topping up is given, during definite value, unloading valve is again turned on, hydraulic pump off-load, so repeatedly, it is ensured that brakes has sufficient power source；Pressure ensures that energy storage pressure maintains steady state value when reaching unloading valve again so that brakes has sufficient power source.

As shown in Figure 4, accumulator 1 is the power source of back axle brake circuit, accumulator 2 is the offer power of propons brake circuit, after both are respectively provided at two check valves, realize the isolation in loop, before accumulator 3 is arranged on front-rear axle brake circuit check valve, three pressure values of accumulator are made to remain equal substantially for front-rear axle accumulator provides pressure supplement, and brakes feedback signal collection be accumulator 3 pressure value, when the pressure of accumulator 3 is less than the lower limit that priority unloading valve is set, load sensitive pump is to its topping up, make brakes power source pressure remained constant, the mode for forming double circuit hydraulic braking valve makes front-rear axle brake circuit separate；At the same time, accumulator 3 is also as a reliable pressure source of parking braking, brake hard and fluid power jogging braking.

Claims

1. a kind of quarry tipper brake fluid system, brake power is provided by quarry tipper of hydraulic system, it is characterized in that：Back pressure valve group is set up, the idle stroke of brake piston is excluded, the response of propons brake pressure is synchronous with the response of back axle brake pressure；Every loop need to individually possess a power source, the working method of the double circuit hydraulic braking valve from full power hydraulic brake system is realized in practice.

2. a kind of quarry tipper brake fluid system according to claim 1, it is characterized in that：One group of back pressure valve group is set up, front-rear axle has been reached and has been realized synchronous requirement, eliminate piston idle stroke operationally.

3. a kind of quarry tipper brake fluid system according to claim 1, it is characterized in that：Every loop sets an independent power source, reaches the purpose that the double loop brake valve in brake fluid system works independently.

4. a kind of quarry tipper brake fluid system according to claim 1, it is characterized in that：Shuttle valve, check valve, damping and filter screen are integrated in the middle of a valve block.

5. a kind of quarry tipper brake fluid system according to claim 1, it is characterized in that：Two power sources are respectively front-rear axle and provide brake power, and another power source ensures that three power driving source situations are consistent.