阅读说明：本技术 采用先导液压锁的拖拉机用浮动阀 (Tractor floating valve adopting pilot hydraulic lock ) 是由 宦治平 盛灿中 于 2018-06-26 设计创作，主要内容包括：采用先导液压锁的拖拉机用浮动阀,是由阀体、主液压锁、先导液压锁和阀杆组成,其主液压锁、先导液压锁和阀杆均装在阀体上相应的孔中,先导液压锁是由推杆、钢球、先导液压锁体、密封件、锁体、和弹簧座组成,阀杆移动推动先导液压锁的推杆移动,实现先导液压锁开启或关闭。阀杆处于中位时,浮动阀作压力保持,负载处于提升的高度不下落。阀杆处于提升位时,先导液压锁仍然关闭。阀杆处于浮动位时,先导液压锁被阀杆顶开,使主液压锁左腔回油,接口由悬挂装置负载产生的压力油使主液压锁开启,接口、阀体回油道、系统压力油道连通,系统及负载全部回油。(The main hydraulic lock, the pilot hydraulic lock and the valve rod are all arranged in corresponding holes on the valve body, the pilot hydraulic lock consists of a push rod, a steel ball, a pilot hydraulic lock body, a sealing piece, a lock body and a spring seat, and the valve rod moves to push the push rod of the pilot hydraulic lock to move so as to realize the opening or closing of the pilot hydraulic lock. When the valve rod is in the middle position, the floating valve keeps pressure, and the load does not fall down when being at the lifting height. When the valve rod is in the lifting position, the pilot hydraulic lock is still closed. When the valve rod is in a floating position, the pilot hydraulic lock is jacked open by the valve rod to enable the left cavity of the main hydraulic lock to return oil, the interface enables the main hydraulic lock to be unlocked by pressure oil generated by a load of the suspension device, the interface, the valve body oil return channel and the system pressure oil channel are communicated, and the system and the load are completely returned oil.)

1. The tractor floating valve adopting the pilot hydraulic lock is composed of a valve body, a main hydraulic lock, the pilot hydraulic lock and a valve rod, and is characterized in that the main hydraulic lock, the pilot hydraulic lock and the valve rod are all arranged in corresponding holes on the valve body, the pilot hydraulic lock is composed of a push rod, a steel ball, a pilot hydraulic lock body, a sealing element, a lock body and a spring seat, and the valve rod moves to push the push rod of the pilot hydraulic lock to move so as to realize the opening or closing of the pilot hydraulic lock.

Technical Field

The invention relates to a reversing valve for agricultural machinery, in particular to a floating valve for a tractor, which adopts a pilot hydraulic lock.

Background

The lifting and floating reversing of a hydraulic suspension device of a tractor is realized by a conventional FP75 distributor, and due to the defects of FP75 in the aspects of suspension static settlement indexes, use stability and the like, the hydraulic suspension device is gradually replaced by a multi-way floating valve with a hydraulic lock, but the suspension static settlement indexes of the multi-way floating valve with the hydraulic lock still have an unstable phenomenon.

Disclosure of Invention

The invention aims to overcome the defects and provides a novel floating valve for a tractor;

the tractor floating valve adopting the pilot hydraulic lock is composed of a valve body, a main hydraulic lock, the pilot hydraulic lock and a valve rod, and is characterized in that the main hydraulic lock, the pilot hydraulic lock and the valve rod are all arranged in corresponding holes on the valve body, the pilot hydraulic lock is composed of a push rod, a steel ball, a spring, a sealing piece, a lock body and a spring seat, and the valve rod moves to push the push rod of the pilot hydraulic lock to move so as to realize the opening or closing of the pilot hydraulic lock.

Drawings

FIG. 1 is a top view of a tractor float valve employing a pilot hydraulic lock

In the drawing, a valve body (1), an oil inlet P, an oil outlet T, a screw plug C, oil ports A1, A2, A3, B1, B2 and B3 are connected with a working mechanism;

FIG. 2 is a cross-sectional view (rotated 90) taken along line A-A of FIG. 1, showing the multi-way float valve in a pressure holding state (neutral position)

In the figure, a valve body (1), a main hydraulic lock (2), a pilot hydraulic lock (3) and a valve rod (4); the valve comprises a connector (1-1), a valve body oil return channel (1-2) and a system pressure oil channel (1-3);

FIG. 3 is a cross-sectional view (rotated 90) taken along line A-A of FIG. 1, showing the multi-way float valve in a pressure-holding state (lifted position)

In the figure, a valve body (1), a main hydraulic lock (2), a pilot hydraulic lock (3) and a valve rod (4); the valve comprises a connector (1-1), a valve body oil return channel (1-2) and a system pressure oil channel (1-3);

FIG. 4 is a cross-sectional view (rotated 90) taken along line A-A of FIG. 1, showing the multi-way float valve in a float position

In the figure, a valve body (1), a main hydraulic lock (2), a pilot hydraulic lock (3) and a valve rod (4); the valve comprises a connector (1-1), a valve body oil return channel (1-2) and a system pressure oil channel (1-3);

FIG. 5 is an enlarged view of the portion I in FIG. 2

In the figure, a valve body (1), a main hydraulic lock (2) and a pilot hydraulic lock (3); the pilot hydraulic lock consists of a push rod (3-1), a steel ball (3-2), a spring (3-3), a sealing element (3-4), a lock body (3-5) and a spring seat (3-6), and in the figure, the multi-way floating valve is in a pressure holding state (a middle position);

FIG. 6 is an enlarged view of section II of FIG. 3

In the figure, a valve body (1), a main hydraulic lock (2) and a pilot hydraulic lock (3); the pilot hydraulic lock consists of a push rod (3-1), a steel ball (3-2), a spring (3-3), a sealing element (3-4), a lock body (3-5) and a spring seat (3-6), and in the figure, the multi-way floating valve is in a pressure holding state (lifting position);

FIG. 7 is an enlarged view of section III of FIG. 4

In the figure, a valve body (1), a main hydraulic lock (2) and a pilot hydraulic lock (3); the pilot hydraulic lock consists of a push rod (3-1), a steel ball (3-2), a spring (3-3), a sealing element (3-4), a lock body (3-5) and a spring seat (3-6), and in the figure, the multi-way floating valve is in a floating position;

Detailed Description

The tractor floating valve adopting the pilot hydraulic lock comprises a valve body (1), a main hydraulic lock (2), a pilot hydraulic lock (3) and a valve rod (4), wherein the main hydraulic lock, the pilot hydraulic lock and the valve rod are all arranged in corresponding holes in the valve body, the pilot hydraulic lock comprises a push rod, a steel ball, a spring, a sealing piece, a lock body and a spring seat, and the valve rod moves to push the push rod of the pilot hydraulic lock to move so as to realize the opening or closing of the pilot hydraulic lock.

In the pilot hydraulic lock, a push rod, a steel ball, a spring, a sealing piece and a spring seat are all arranged in a lock body, when a valve rod is positioned at a middle position, the load of a suspension device acts on a tractor lifting oil cylinder to fill a connector with pressure oil, at the moment, the main hydraulic lock and the pilot hydraulic lock are closed to stop the pressure oil in the connector in a reverse direction, a floating valve keeps pressure, and the load is positioned at the lifting height and does not fall down.

When the valve rod is positioned at the lifting position, system pressure oil of the system pressure oil duct opens the main hydraulic lock flow direction interface to load the tractor lifting oil cylinder to complete the action of lifting the load, and at the moment, the pilot hydraulic lock is still closed.

When the valve rod is in a floating position, the pilot hydraulic lock is jacked open by the valve rod to enable the left cavity of the main hydraulic lock to return oil, the interface enables the main hydraulic lock to be unlocked by pressure oil generated by a load of the suspension device, the interface, the valve body oil return channel and the system pressure oil channel are communicated, and the system and the load are completely returned oil.

Because the pilot hydraulic lock works in a micro-flow state, mechanical contact abrasion caused by the unlocking action of the valve rod on the pilot hydraulic lock is very small, and the two hydraulic locks are designed into an integral plug-in type and are produced by a professional plug-in valve factory, so that the quality is good, the price is low, the integral plug-in type hydraulic lock is close to zero leakage, the stability is very good, and the pressure of the floating valve is kept stable for a long time.