CN202194877U

CN202194877U - Variable split-flow change valve

Info

Publication number: CN202194877U
Application number: CN2011200755982U
Authority: CN
Inventors: 张其登
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-22
Filing date: 2011-03-22
Publication date: 2012-04-18
Anticipated expiration: 2021-03-22

Abstract

The utility model provides a variable split-flow change valve, which relates to the technical field of hydraulic control and mainly comprises a valve body, a valve rod 1, a valve rod 2, a relief valve, an overload valve and a hydraulic control valve. The valve body is provided with an oil inlet, a working oil port, an oil return port, a steering oil port and a sensing oil port. The variable split-flow change valve is characterized in that the hydraulic control valve is controlled by hydraulic steering machine sensing oil, and can automatically adjust pressure and flow which are needed by steering, on the premise of guaranteeing oil supply for a steering machine preferentially, redundant hydraulic oil split-flows to operating systems, when a first path is in work, return oil of the first path enters inlet oil of a second path, so that two paths can work simultaneously. The variable split-flow change valve is compact in structure, easy and flexible to operation, high in efficient and energy-saving, can achieve steering and a plurality of movements to be in linkage simultaneously, gives full play to effective power of an engine, and is applicable to machinery using hydraulic steering such as loaders, forklifts and agricultural machinery.

Description

Variable shunting selector valve

Technical field

The utility model relates to the hydraulicdirectional control valve technical field.

Background technique

Present existing hydraulicdirectional control valve adopts the serial or parallel connection oil circuit, needs working pressure not simultaneously on each road, can not realize moving simultaneously accurately inconvenient operation, inefficiency.Fluid-link steering machine adapted pressure-gradient control valve, diverter valve or independent oil supply system, complex structure is wasted power, can not give full play to the useful horsepower of motor, and at the bottom of the working efficiency, energy waste is big.

Summary of the invention

The purpose of the utility model provides a kind of variable shunting selector valve, is characterized in: the hydraulic control valve (D1), valve stem slides device and the sealing configuration that are provided with the directly moving relief valve (Y) of valve body (3), valve rod (1), valve rod (2), hydraulic cushion, overload valve (G), are made up of valve body (3) and spool (6) spring (5) joint (4); When oil pump feed got into hyperbaric chamber (P), under the initial drag effect of hydraulic control valve (D1), hydraulic oil was given the steering box fuel feeding through turning to hydraulic fluid port (Z); Its sensing oil gets into hydraulic control valve (D1) through sensing hydraulic fluid port (K) during steering box work; Promoting spool (6) raises hyperbaric chamber (P) pressure; When the pressure of hyperbaric chamber (P) satisfied the steering pressure needs, high pressure oil promoted spool (6) and moves backward, turns to remaining hydraulic oil to be diverted to operation hyperbaric chamber (10); Through off-load oil duct (S), by return opening (T) oil sump tank; When valve rod (1) when being moved to the left; Closing off-load oil duct (S) high pressure oil pushes one-way valve (D2) open and gets into actuator port (A1) through high-pressure oil duct (11) and lead to operating cylinder; The oil return of operating cylinder gets into first via back oil road (13) through actuator port (B1) and leads to the second road oil input channel (18); When valve rod (1) when moving right, close off-load oil duct (S), high pressure oil gets into actuator port (B1) and leads to operating cylinder; Make the operating cylinder reversing motion, the oil return of oil cylinder gets into the second road oil input channel (18) through actuator port (A1) to first via back oil road (14); When valve rod (2) when being moved to the left; Close off-load oil duct (S); Fluid leads to No. the second operating cylinder by the second road oil input channel through actuator port (A2); The oil return of No. the second operating cylinder through actuator port (B2) to back oil road (16) through return opening (T) oil sump tank, when valve rod (2) when moving right, close off-load oil duct (S) fluid and lead to No. the second operating cylinder through actuator port (B2); Make the oil cylinder reversing motion, the oil return of oil cylinder is arrived back oil road (17) through return opening (T) oil sump tank through actuator port (A2); Realization turns to, the two-way operation is worked simultaneously.

The technological scheme of the utility model is: a kind of variable shunting selector valve, mainly comprise valve body, and valve body is provided with high pressure hydraulic fluid port and the hydraulic control valve that turns to hydraulic fluid port and be made up of spool, spring, joint and valve body; Oil pump infeeds the hydraulic oil of filler opening at first through turning to hydraulic fluid port to give the steering box fuel feeding; During steering box work, its sensing oil is communicated with valve body sensing hydraulic fluid port, and hydraulic control valve is under the effect of sensing oil; Automatically adjustment turns to required pressure and flow, and remaining hydraulic oil is diverted to Operation System; Be provided with first slideway that actuator port A1, B1 cooperate with valve rod 1 in the valve body; On the valve rod 1 and first slideway; Be provided with when valve rod 1 is moved to the left; Operation high-voltage oil cavity and actuator port A1 are communicated with and operation high-voltage oil cavity and actuator port B1 are closed; When valve rod 1 kinetic energy that moves right makes the operation high-voltage oil cavity be communicated with actuator port B1, and the structure that operation high-voltage oil cavity and actuator port A1 are closed; Be provided with the back oil road of actuator port A1 and the back oil road of actuator port B1 and be communicated with, and be provided with valve rod 1 sliding device and sealing configuration thereof with the second road oil input channel.Second slideway that is provided with actuator port A2, B2 and cooperates with valve rod 2; On the valve rod 2 and second slideway; Be provided with when valve rod 2 is moved to the left and the second road oil input channel be communicated with actuator port A2 the second road oil input channel and actuator port B2 are closed;, valve rod 2 can make the second road oil input channel be communicated with the structure that the second road oil input channel and actuator port A2 are closed with actuator port B2 when moving right; Be provided with the back oil road of actuator port A2 and the back oil road of actuator port B2, lead to return opening, be provided with the sliding device and the sealing configuration thereof of valve rod 2.Be provided with the directly moving relief valve of hydraulic cushion and connect high-voltage oil cavity and return opening; Be provided with one-way valve between operation high-voltage oil cavity and the high-pressure oil duct, second slideway is provided with overload valve, is provided with when valve rod is worked the off-load oil duct of closing, being communicated with during off working state between operation high-voltage oil cavity and the return opening.

The characteristics of the utility model are: compact structure, energy-efficient, reduced the pressure loss and flow loss, and it is flexible to work; Perfect in shape and function through hydraulic control valve is set, can guarantee preferentially to give the steering box fuel feeding and can adjust automatically to turn to required pressure and flow; Accomplish the variable shunting; As back one tunnel oil-feed, can realize that a plurality of work operations move simultaneously through the oil return of last road, overcome the deficiency of prior art.Can give full play to the useful horsepower of motor, the directly moving relief valve of hydraulic cushion, stable working; Reliably; Less demanding to the cleanliness of hydraulic oil degree, can in seriously polluted, rugged environment, use, be particularly suitable for loader, fork truck, agricultural machinery and other uses the machinery of fluid-link steering to use.

Be described further below in conjunction with embodiment, but not as the qualification to the utility model.

Description of drawings

Fig. 1 structural representation

Fig. 2 profile schematic representation

The directly moving structure of relief valve schematic representation of Fig. 3 hydraulic cushion

Fig. 4 hydraulic schematic diagram

Among Fig. 1: 1 is that

valve rod

1,2 is that

valve rod

2,3 is that valve body, 4 is that joint, 5 is that spring, 6 is that spool, 10 is that operation hyperbaric chamber, 11 is that high-pressure oil duct, 12 is that the 1 tunnel zero load back oil road, 13 and 14 is that the 1 road back oil road, 15 is that the 2 tunnel zero load back oil road, 16 and 17 is that the 2 road back oil road, 18 is that the 2 road oil input channel, S are that off-load oil duct, P are that high-voltage oil cavity, D1 are that hydraulic control valve, D2 are one-way valve.

Among Fig. 2: P is that filler opening, Z are that sensing hydraulic fluid port, A1 and B1 are that the No. 1 actuator port, A2 and B2 are that the No. 2 actuator port, T are that return opening, Y are that the directly moving relief valve of hydraulic cushion, G are overload valve for turning to hydraulic fluid port, K.

Among Fig. 3: 1 overflow valve body, 2 spools, 3 springs, female, the 5 adjustment screws of 4 lids.

1. 3. 4. O-ring seals, 2. 5. 6. combination mat of nut of steel ball.

Among Fig. 4: P filler opening, Z turn to the directly moving relief valve of hydraulic fluid port, K sensing hydraulic fluid port, Y hydraulic cushion, D1 hydraulic control valve, D2 one-way valve, T return opening, G overload valve, Az and Bz steering box actuator port, A1 and B1 first via actuator port, A2 and B2 No. the second actuator port.

Embodiment

Be used for example referring to Fig. 1～4 with loader, among Fig. 1, oil inlet P connects oil pump; Turn to hydraulic fluid port Z to connect the steering box filler opening, sensing hydraulic fluid port K connects steering box sensing hydraulic fluid port, when steering box is worked; High pressure oil turns to actuator port Az, the logical oil cylinder that turns to of Bz by turning to hydraulic fluid port K to get into steering box, and steering box sensing oil gets into sensing hydraulic fluid port K on the valve body; Make spool 6 produce back pressure, input pressure is improved, steering box gets into normal working; When the pressure of high pressure oil and flow satisfy the steering box needs; Hydraulic oil promotion spool 6 moves backward unnecessary hydraulic oil is diverted to operation high-voltage oil cavity 10, and spool 6 is adjusted the pressure and the flow of steering oil automatically under the pressure control of sensing oil, be in dynamic equilibrium state.Be diverted to the hydraulic oil of operation hyperbaric chamber 10, be made for the industry system works, when steering box is not worked; Spool 6 has lost the back pressure of sensing oil; Move backward, high pressure oil all gets into operation hyperbaric chamber 10 and is made for the industry system and uses, and has realized preferentially turning to, the function of variable shunting.Actuator port A1, B1 connect loader and lift the arm oil cylinder, and valve rod 1 is moved to the left, and off-load oil duct S closes; High pressure oil is pushed one-way valve D2 open from operation high-voltage oil cavity 10; Get into actuator port A1 through high-pressure oil duct 11, lead to and lift arm oil cylinder epicoele, the oil return of oil cylinder cavity of resorption gets into back oil road 13 through actuator port B1 and leads to the second tunnel oil input channel; At this moment, lifting arm descends; Valve rod 1 moves right; Off-load oil duct S closes; High pressure oil in the operation high-voltage oil cavity 10 is pushed one-way valve D2 open and is led to act arm operating cylinder cavity of resorption through high-pressure oil duct 11 entering actuator port B1; The oil return of oil cylinder epicoele to back oil road 14, gets into the second tunnel oil input channel through actuator port A1, at this moment lifts arm and rises.Actuator port A2, B2 connect bucket cylinder; Valve rod 2 is moved to the left, and closes off-load oil duct S, and the second tunnel oil-feed gets into actuator port A2 and leads to the scraper bowl operating cylinder; The oil return of scraper bowl operating cylinder gets into back oil road 16 through actuator port B2 and leads to oil return inlet T, the at this moment outside tipping bucket of scraper bowl; Valve rod 2 moves right, and closes off-load oil duct S, and the second tunnel oil-feed is led to bucket cylinder through actuator port B2, and the oil return of oil cylinder gets into back oil road 17 through actuator port A2 and leads to oil return inlet T, oil sump tank, and at this moment scraper bowl scrolls up bucket.Oil return through the first via is as the second tunnel oil-feed measure, realized that the two-way operation works simultaneously, and this hydraulic system has realized turning to, a plurality of action random combination of operation.Flexible operation, convenience, efficient.When the first via was not worked, high pressure oil was pushed one-way valve D2 open from operation hyperbaric chamber 10, directly got into the second tunnel work through oil duct 11,12; When unloaded, do not have sensed pressure, spool 6 resistances are very little; Oil pump comes oil to push spool 6 open to lead to the oil return inlet T oil sump tank through off-load oil duct S, and another part hydraulic oil is pushed one-way valve D2 open through oil duct 11,12,15 logical oil return inlet T, oil sump tank through operation hyperbaric chamber 10; Be two off-load oil ducts; The oil return resistance is little, has reduced heating value, saves power.Be provided with the directly moving relief valve of hydraulic cushion between high-voltage oil cavity P and the oil return inlet T, see Fig. 3 structural representation, when system pressure reaches rated pressure 16Mpa; 2. high pressure oil promotes steel ball, and spool 2 moves emptying backward, and spring 3 place oil pockets produce the hydraulic cushion effect for the buffering oil pocket through the damping hole in the middle of the spool 2; Simple in structure, stable working, reliable is difficult for stopping up; Less demanding to the cleanliness of hydraulic oil degree, can adapt under the with serious pollution severe environmental conditions and work.Actuator port A2, B2 are provided with overload valve G.Valve rod rear end is provided with resetting means, and front end is provided with the valve stem slides device.

Claims

1. hydraulic control valve (D1), valve stem slides device and sealing configuration that variable shunting selector valve, main zero, parts comprise the directly moving relief valve (Y) of valve body (3), valve rod (1), valve rod (2), hydraulic cushion, overload valve (G), are made up of valve body (3) and spool (6) spring (5) joint (4); When oil pump feed got into hyperbaric chamber (P), under the initial drag effect of hydraulic control valve (D1), hydraulic oil was given the steering box fuel feeding through turning to hydraulic fluid port (Z); Its sensing oil gets into hydraulic control valve (D1) through sensing hydraulic fluid port (K) during steering box work; Promoting spool (6) raises hyperbaric chamber (P) pressure; When the pressure of hyperbaric chamber (P) satisfied the steering pressure needs, high pressure oil promoted spool (6) and moves backward, turns to remaining hydraulic oil to be diverted to operation hyperbaric chamber (10); Through off-load oil duct (S), by return opening (T) oil sump tank; When valve rod (1) when being moved to the left; Closing off-load oil duct (S) high pressure oil pushes one-way valve (D2) open and gets into actuator port (A1) through high-pressure oil duct (11) and lead to operating cylinder; The oil return of operating cylinder gets into first via back oil road (13) through actuator port (B1) and leads to the second road oil input channel (18); When valve rod (1) when moving right, close off-load oil duct (S), high pressure oil gets into actuator port (B1) and leads to operating cylinder; Make the operating cylinder reversing motion, the oil return of oil cylinder gets into the second road oil input channel (18) through actuator port (A1) to first via back oil road (14); When valve rod (2) when being moved to the left; Close off-load oil duct (S), fluid leads to No. the second operating cylinder by the second road oil input channel through actuator port (A2), and the oil return of No. the second operating cylinder is arrived back oil road (16) through return opening (T) oil sump tank through actuator port (B2); When valve rod (2) when moving right; Close off-load oil duct (S) fluid and lead to No. the second operating cylinder through actuator port (B2), make the oil cylinder reversing motion, the oil return of oil cylinder is arrived back oil road (17) through return opening (T) oil sump tank through actuator port (A2); Realization turns to, the two-way operation is worked simultaneously.