CN105179350B - Valve block assembly of three-way type lifting hydraulic system for dump truck - Google Patents

Abstract

The invention provides a valve block assembly of a three-way type lifting hydraulic system for a dump truck and belongs to the technical field of hydraulic control. The valve block assembly comprises a P1 oil inlet one-way valve, a P2 oil inlet one-way valve, a lifting control cartridge valve plugin, a lifting unloading cartridge valve plugin, a lifting control cartridge valve control cove plate, a lifting unloading cartridge valve control cover plate, a lifting control pilot valve, a lifting unloading pilot valve, a carriage fall-back rate-limiting cartridge valve control cover plate, a one-way valve, a floating valve, a pressure-limiting valve, an oil inlet P1, an oil inlet P2, an oil outlet A, an oil return opening T, an electromagnet DT1, an electromagnet DT2 and an electromagnet DT3. The oil inlet P1 and the oil inlet P2 are isolated from each other through the one-way valves, and oil can be supplied through any one of the oil inlets and can be supplied in the manner that two oil sources flow together. The oil outlet A is connected with a lifting oil cylinder. The oil return opening T is connected with a hydraulic oil tank. By means of the valve block assembly, oil way arrangement can be simplified, and the integratability and stability of the system are improved. The valve block assembly can be used for lifting systems of dump trucks of different tonnages.

Description

Dump truck three-way lifting hydraulic system valve block assembly

technical field

The invention relates to the technical field of hydraulic control, in particular to a valve block assembly of a three-way lifting hydraulic system of a dump truck.

Background technique

Dump trucks generally use a hydraulic transmission system to realize the cargo compartment turning (lifting) unloading and falling back. Large dump trucks require the lifting hydraulic system to be able to realize the four action requirements of cargo compartment lifting, stopping at any position, falling back and floating. At present, the lifting hydraulic system of dump trucks produced abroad uses a specially customized lifting valve block, including a spool valve and a number of auxiliary valves to achieve four working conditions. Due to the lack of development capabilities of hydraulic valves, domestic manufacturers generally use industrial valves. Use standard reversing valves or multi-way valves. This kind of valve is a spool type reversing valve. The gap between the valve core and the valve body is very small, the manufacturing precision is high, it is sensitive to oil pollution, and it is prone to valve stuck faults; in order to reduce Some manufacturers of super-large-tonnage dump trucks use multiple large-diameter cartridge valves to realize internal leakage, but the structure of the pilot control system is complex and the reliability is low.

Contents of the invention

The technical problem to be solved by the present invention is to provide a valve block assembly of a three-way lifting hydraulic system for a dump truck. The valve block has the characteristics of simple structure, reliable operation, complete functions, and is suitable for a wide tonnage range of dump trucks.

The valve block assembly includes P1 oil inlet check valve, P2 oil inlet check valve, lift control cartridge valve insert, lift unloading cartridge valve insert, lift control cartridge valve control cover, lift unloader Loading cartridge valve control cover plate, lift control pilot valve, lift unloading pilot valve, cargo compartment drop speed limit cartridge valve control cover plate, check valve, floating valve, pressure limiting valve, oil inlet P1, inlet Oil port P2, oil outlet A, oil return port T, electromagnet DT1, electromagnet DT2 and electromagnet DT3; among them, the P1 oil inlet check valve controls the oil inlet P1, and the P2 oil inlet check valve controls the oil inlet P2, the lift control cartridge valve insert is installed on the lift control cartridge valve control cover plate, the lift unloading cartridge valve insert is installed on the lift unloading cartridge valve control cover plate, the lift control pilot valve is connected The lift control cartridge valve insert, the lift control pilot valve is controlled by the electromagnet DT1, the lift unloading pilot valve is connected to the lift unloading cartridge valve insert, the lift unloading pilot valve is controlled by the electromagnet DT2, and the cargo compartment falls back The control cover of the speed limiting cartridge valve is installed on the side of the oil outlet A, the check valve is connected with the floating valve and the pressure limiting valve, the floating valve is controlled by the electromagnet DT3, the oil return port T is connected with the oil inlet P1 and the oil inlet P2 is mounted on the same side.

The oil inlet P1 and the oil inlet P2 can be fed into both oil ports at the same time, or only one of the oil ports can be used to feed oil, and the other oil port can be plugged with a plug. Port T is externally connected to the hydraulic oil tank. When the oil inlet P1 and the oil inlet P2 are fed at the same time, the P1 oil inlet check valve and the P2 oil inlet check valve can isolate the two oil inlets to avoid mutual interference between the two oil sources. The lift control cartridge valve insert and the lift unloader cartridge valve insert are used to control the direction of fluid flow, whether the fluid flows to the lift cylinder or the hydraulic tank. The speed-limiting cartridge valve for cargo box fall back controls the cover plate to control the falling speed of the cargo box, and at the same time, the one-way valve ensures the lifting speed. When the plug-in valve port of the lift control cartridge valve is closed or opened instantly, an oil pressure shock will appear in the valve block, and the pressure limiting valve can limit the maximum value of the oil pressure shock. During the normal driving of the dump truck, the electromagnet DT3 is energized, and the floating valve connects the oil outlet A with the oil return port T, that is, the lifting cylinder is connected with the hydraulic oil tank, and the up and down vibration of the cargo compartment will not cause the oil in the lifting cylinder to pressure impact; due to the power failure of the electromagnet DT2, the lift unloading pilot valve connects the control chamber of the lift unloading cartridge valve insert with the oil return port T, so the lift unloading cartridge valve insert opens, and the oil inlet P1, The oil inlet P2 is connected with the oil return port T, and the oil pump is unloaded; when the cargo box needs to be lifted and unloaded, the electromagnet DT2 is energized, the electromagnet DT1 and the electromagnet DT3 are kept powered off, and the lift unloading pilot valve will lift the unloading valve. The plug-in control cavity of the load-cartridge valve is closed, the oil inlet P1 and the oil inlet P2 are disconnected from the oil return port T, and connected to the oil outlet A, and the oil enters the lifting cylinder to push the cargo compartment to turn over to unload; during the unloading process If it is necessary to stop at a certain position, the electromagnet DT2 can be powered off, the oil inlet P1 and the oil inlet P2 are connected to the oil return port T again, and the oil outlet A is closed by the lift control cartridge valve plug-in; After the unloading truck completes the unloading action, the electromagnet DT1 is energized, the electromagnet DT2 and the electromagnet DT3 are de-energized, the oil outlet A is fully connected with the oil inlet P1, the oil inlet P2, and the oil return port T, and the lifting cylinder is retracted. The cargo compartment falls back.

The beneficial effects of above-mentioned technical scheme of the present invention are as follows:

1. The main oil circuit adopts a cone valve structure, and two two-way cartridge valves are used to realize the lifting control function, so as to avoid faults such as stuck valve and abnormal action caused by the manufacturing problem of the spool valve core or the oil pollution problem;

2. The working parameters of the cartridge valve can cover small flow rate to super large flow rate, and the valve block is easy to realize serialized products, which are suitable for dump trucks of various tonnages;

3. The two-way cartridge valve and threaded cartridge valve are used to make the valve block compact in structure and small in size, which is convenient to arrange on the dump truck;

4. The electromagnetic directional valve is used for pilot control, which can realize four actions of lifting, holding, falling and floating of the cargo box of the dump truck, with complete functions and convenient operation;

5. Through two one-way valves, multiple oil pumps (such as steering oil pumps) can be combined and lifted to improve the working efficiency of the lifting system.

Description of drawings

Fig. 1 is the schematic diagram of the valve block assembly of the three-way lifting hydraulic system of the dump truck of the present invention;

Fig. 2 is the front view of the valve block assembly of the three-way lifting hydraulic system of the dump truck of the present invention;

3 is a top view of the valve block assembly of the three-way lifting hydraulic system of the dump truck of the present invention;

Fig. 4 is a left view of the valve block assembly of the three-way lifting hydraulic system of the dump truck of the present invention;

Fig. 5 is a side view of the valve block assembly of the three-way lifting hydraulic system of the dump truck according to the present invention.

in:

1-P1 oil inlet check valve; 2-P2 oil inlet check valve; 3-lift control cartridge valve insert; 4-lift unloading cartridge valve insert; 5-lift control cartridge valve control cover ;6-Lift unloading cartridge valve control cover; 7-Lift control pilot valve; 8-Lift unloading pilot valve; 9-Cargo compartment fall speed limit cartridge valve control cover; 10-Check valve ;11-floating valve; 12-pressure limiting valve; 13-oil inlet P1; 14-oil inlet P2; 15-oil outlet A; 16-oil return port T; 17-electromagnet DT1; 18-electromagnet DT2; 19 - electromagnet DT3.

detailed description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

Aiming at the problems of low reliability of the existing lifting hydraulic system, the invention provides a valve block assembly of a three-way lifting hydraulic system of a dump truck.

As shown in Figure 1, it is the schematic diagram of the valve block assembly, including P1 oil inlet check valve 1, P2 oil inlet check valve 2, lift control cartridge valve insert 3, lift unloading cartridge valve insert 4. Lift control cartridge valve control cover 5. Lift unloading cartridge valve control cover 6. Lift control pilot valve 7. Lift unloading pilot valve 8. Cargo compartment fall speed limit cartridge valve control cover Plate 9, check valve 10, floating valve 11, pressure limiting valve 12, oil inlet P1 13, oil inlet P2 14, oil outlet A 15, oil return port T 16, electromagnet DT1 17, electromagnet DT2 18 and solenoid DT3 19 .

As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, they are the front view, top view, left view and isometric view of the valve block assembly. P1 oil inlet check valve 1 controls the oil inlet P1 13, P2 oil inlet check valve 2 controls the oil inlet P2 14, the lift control cartridge valve plug-in 3 is installed on the lift control cartridge valve control cover plate 5, The lift unloading cartridge valve insert 4 is installed on the lift unloading cartridge valve control cover plate 6, the lift control pilot valve 7 is connected to the lift control cartridge valve insert 3, and the lift control pilot valve 7 is controlled by the electromagnet DT1 17 control, the lift unloading pilot valve 8 is connected to the lift unloading cartridge valve plug-in 4, the lifting unloading pilot valve 8 is controlled by the electromagnet DT2 18, and the control cover plate 9 of the cargo box falling speed limiting cartridge valve is installed on the outlet On the side of oil port A 15, check valve 10 is connected with float valve 11 and pressure limiting valve 12, float valve 11 is controlled by electromagnet DT3 19, oil return port T 16 is installed with oil inlet P1 13 and oil inlet P2 14 on the same side.

The principle action process of the present invention is as follows: in the initial state of the system, all electromagnets are powered off, and the oil coming in from the oil inlet P113 and the oil inlet P214 is directly returned to the oil tank through the lifting and unloading cartridge valve insert 4, and the system It is in the unloading state; when lifting and unloading, the electromagnet DT2 18 is energized, the lifting and unloading pilot valve 8 moves to the right position, the lifting and unloading cartridge valve insert 4 is closed, and the oil passes through the lifting control cartridge valve Plug-in 3. Cartridge falling speed limit cartridge valve and check valve 10 enter the lifting cylinder to push the cargo compartment to turn over; when it is necessary to stop at any position during the lifting process, the electromagnet DT2 18 is powered off, and the oil is discharged through the lift. Cartridge valve plug-in 4 is returned to the oil tank. At this time, the lift control cartridge valve plug-in 3 is equivalent to a one-way valve, which can prevent the oil in the lifting cylinder from flowing backward; when the cargo compartment needs to fall and the lifting cylinder is retracted, When the electromagnet DT1 17 is energized, the oil in the lift cylinder flows back to the fuel tank through the lift control cartridge valve insert 3 and the lift unloading cartridge valve insert 4, and the cargo compartment falls; The cabin will bump up and down, which will cause the lifting cylinder to vibrate. At this time, the electromagnet DT3 19 is energized to make the lifting cylinder communicate with the fuel tank through the float valve 11, so as to avoid oil pressure shock in the lifting cylinder due to vibration; the lifting unloading plug The safety valve in the valve control cover plate 6 can limit the maximum pressure of the lifting system to avoid damage to the lift valve block caused by the overload of the dump truck; the pressure limiting valve 12 adjusts the pressure ratio of the lift unloading cartridge valve control cover plate 6 The height of the safety valve is used to limit the excessive oil pressure shock that occurs in the valve block when the lift control cartridge valve plug-in 3 is closed. The throttle valve and the one-way valve 10 in the speed-limiting plug-in valve control cover plate 9 of cargo compartment fall back can limit the speed that cargo compartment falls, avoiding that the cargo compartment descends too fast to damage the vehicle frame, and does not affect the lifting speed simultaneously. Table 1 below is the solenoid valve action table.

Table 1 Solenoid valve action table of dump truck lift valve block

Condition DT1 DT2 DT3 lift up power outage power ups power outage Keep power outage power outage power outage decline power ups power outage power outage floating/driving power outage power outage power ups

The above is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (1)

1. A dump truck three-way lift hydraulic system valve block assembly, characterized in that it includes P1 oil inlet check valve (1), P2 oil inlet check valve (2), lift control cartridge valve Insert (3), lift unloading cartridge valve insert (4), lift control cartridge control cover (5), lift unloading cartridge control cover (6), lift control pilot valve ( 7), Pilot valve for lifting and unloading (8), control cover plate for cargo box drop speed limiting cartridge valve (9), check valve (10), floating valve (11), pressure limiting valve (12), oil inlet Port P1(13), oil inlet P2(14), oil outlet A(15), oil return port T(16), electromagnet DT1(17), electromagnet DT2(18) and electromagnet DT3(19) ; Among them, the P1 oil inlet check valve (1) controls the oil inlet P1 (13), the P2 oil inlet check valve (2) controls the oil inlet P2 (14), and the lift control cartridge valve plug-in (3) is installed On the lift control cartridge valve control cover plate (5), the lift unloading cartridge valve insert (4) is installed on the lift unloading cartridge valve control cover plate (6), and the lift control pilot valve (7 ) is connected to the lift control cartridge valve insert (3), the lift control pilot valve (7) is controlled by the electromagnet DT1 (17), and the lift unloading pilot valve (8) is connected to the lift unloading cartridge valve insert (4 ), the lifting and unloading pilot valve (8) is controlled by the electromagnet DT2 (18), the control cover plate (9) of the speed-limiting cartridge valve for the carriage falling back is installed on the side of the oil outlet A (15), and the check valve ( 10) One end is connected to the float valve (11), the other end of the check valve (10) is connected to the pressure limiting valve (12), the float valve (11) is controlled by the electromagnet DT3 (19), and the oil return port T (16) is connected to Oil inlet P1 (13) and oil inlet P2 (14) are installed on the same side; The oil inlet P1 (13) and the oil inlet P2 (14) feed oil separately or supply oil together; The oil outlet A (15) is externally connected to the lifting cylinder; The oil return port T (16) is externally connected to a hydraulic oil tank; The pressure limiting valve (12) is arranged between the oil outlet A (15) and the lift control cartridge valve insert (3); The lift control cartridge valve insert (3) and the lift unloading cartridge valve insert (4) control the oil flow direction.