CN201221635Y

CN201221635Y - Hydraulic spacing elevating valve for dump truck

Info

Publication number: CN201221635Y
Application number: CNU2008200642696U
Authority: CN
Inventors: 赵寅
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-12
Filing date: 2008-07-12
Publication date: 2009-04-15
Anticipated expiration: 2018-07-12

Abstract

The utility model discloses a hydraulic limiting lift valve for a dump truck, which comprises a combination valve body and a slide valve matching with the combination valve body. The combination valve body is provided with an oil inlet, a working oil port and an oil return port. One end of the slide valve is connected with a main piston. The main piston and an offsetting spring matching with the main piston are arranged in the end cover of the combination valve body. A medium inlet is arranged on the end cover. The hydraulic limiting lift valve is characterized in that a one-way valve is arranged at the oil inlet, and the other end of the slide valve is positioned outside the combination valve body and provided with a touching rod. The utility model can control the working position of a dump truck oil cylinder, and at the same time, has the advantages of small volume, convenient machining and low cost.

Description

Dump truck hydraulic stop lifting valve

Technical field

The utility model relates to a kind of hydraulic stop lifting valve that is used for dump truck.

Background technique

Now be widely used in the hydraulic lifting valve of dump truck, as the patent No. is 00257042.4 disclosed a kind of, comprise combinaing valve body, supporting guiding valve with it, combinaing valve body has end cap and is provided with filler opening, actuator port and return opening, and combinaing valve body is the four-groove type valve body, and wherein two grooves link to each other by inner runner, one relief valve is loaded in the valve pool, one end of guiding valve is connected with a main piston, and main piston and the Returnning spring supporting with it are loaded in the end cap of combinaing valve body, and end cap is provided with the medium import; This lifting valve is realized the break-make of oil circuit by the control main piston, but the infinite place device, the working position of uncontrollable dump truck oil cylinder, and simultaneously because inner flow passage is comparatively complicated, volume is big, be difficult to processing, cost is higher.

The model utility content

The purpose of this utility model is the above-mentioned deficiency at prior art, and a kind of dump truck hydraulic stop lifting valve is provided, and it can reliably control each working position of dump truck oil cylinder, have simultaneously volume little, be convenient to process, advantage that cost is low.

For achieving the above object, dump truck of the present utility model hydraulic stop lifting valve, comprise combinaing valve body, supporting guiding valve with it, combinaing valve body is provided with filler opening, actuator port and return opening, one end of guiding valve is connected with a main piston, and main piston and the Returnning spring supporting with it are loaded in the end cap of combinaing valve body, and end cap is provided with the medium import, it is characterized in that an one-way valve is loaded on filler opening, the other end of guiding valve is positioned at outside the combinaing valve body and is provided with touching lever;

The inner flow passage of combinations thereof valve body can be designed to two slot type structures; Promote guiding valve by medium and Returnning spring control main piston, realize the break-make of two oil circuits, hydraulic oil is flowed out from the actuator port or the return opening of valve, realize the lifting or the decline of oil cylinder; In the process of lifting, the oil cylinder of dump truck tilts to desired location compression touching lever, and guiding valve is moved vertically, and the inner filler opening of valve, return opening and actuator port runner are communicated, and reaches the purpose spacing to oil cylinder;

The inner flow passage of combinations thereof valve body also can be designed to three slot type structures, also is provided with the reverse media import on the end cap that main piston is installed; Be in three positions, left, center, right by medium and Returnning spring control main piston, realize the break-make control of three oil circuits; When guiding valve mediated, actuator port and filler opening and return opening were disconnected by the guiding valve envelope, and filler opening and return opening are connected, and make the oil-feed release, the actuator port sealing, and the self-unloading oil cylinder piston is in stop position; Feed pressure medium in medium import, reverse media import respectively and promote the guiding valve move left and right, make guiding valve change the oil circuit break-make, realize the lifting and the decline of self-unloading oil cylinder; In the process of lifting, the oil cylinder of dump truck tilts to desired location compression touching lever, and guiding valve is moved vertically, and the inner filler opening of valve, return opening and actuator port runner are communicated, and reaches the purpose spacing to oil cylinder;

As further improvement of the utility model, also be provided with the sign back-up ring at an end of the guiding valve that is provided with touching lever; The sign that the mounting point of its valve is determined when being used for the valve installation;

As further improvement of the utility model, in guiding valve, be provided with the relief valve that is communicated with filler opening, actuator port and return opening; When overpressure, can pass through the relief valve release, and not increase the volume of valve;

As further improvement of the utility model, in the end cap of the combinaing valve body that main piston is installed, also be provided with the fine motion piston, the fine motion piston is provided with the medium import in the bottom of end cap between the bottom of main piston and end cap; In the process that descends, feed pressure medium in this medium import, the fine motion of fine motion piston is contacted with main piston, the stroke of restriction main piston, the drainback passage that valve body and guiding valve are formed is in throttle, makes self-unloading oil cylinder throttling oil return, realizes falling slowly of self-unloading oil cylinder;

In sum, the utility model can be controlled each working position of dump truck oil cylinder, simultaneously because the valve inner runner is simple, have volume little, be convenient to processing, lower-cost advantage.

Description of drawings

Fig. 1 is the utility model embodiment one a plan view.

Fig. 2 is the B-B sectional drawing of Fig. 1.

Fig. 3 is the utility model embodiment one a hydraulic schematic diagram.

Fig. 4 is the utility model embodiment two a plan view.

Fig. 5 is that the A of Fig. 4 is to view.

Fig. 6 is the utility model embodiment two a hydraulic schematic diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

Embodiment one

By Fig. 1, Fig. 2, shown in Figure 3, this embodiment's dump truck hydraulic stop lifting valve, comprise that inner flow passage is the combinaing valve body 1 of two slot type structures, supporting with it guiding valve 2, combinaing valve body 1 is provided with filler opening 3, actuator port 4 and return opening 5, one one-way valve 6 is plugged in filler opening 3, in guiding valve 2, be provided with and be communicated with filler opening 3, the relief valve 7 of actuator port 4 and return opening 5, one end of guiding valve 2 is connected with a main piston 8, main piston 8 and the Returnning spring 9 supporting with it are loaded in the end cap 10 of combinaing valve body 1, end cap 10 is provided with medium import 11, in this end cap 10, also be provided with fine motion piston 12, fine motion piston 12 is provided with medium import 13 in the bottom of end cap 10 between the bottom of main piston 8 and end cap 10; It is outer and be provided with touching lever 14 by screw thread that the other end of guiding valve 2 is positioned at combinaing valve body 1, also is provided with spacing back-up ring 15 at this end of guiding valve 2;

When control media import 11 did not feed pressure medium, guiding valve 2 resetted under the effect of Returnning spring 9, filler opening 3, and actuator port 4 communicates with return opening 5, filler opening 3, the fluid of actuator port 4 all flows back to the fuel tank release from return opening 5, and the compartment is descended.In the process that descends, feed fluid as medium import 13, fine motion piston 12 is contacted with main piston 8, make the meter out of oil cylinder realize falling slowly of compartment, move to left when fed pressure medium promotion main piston 8 drive guiding valves 2 by medium import 11, make filler opening 3, actuator port 4 all disconnects with return opening 5, fluid arrives elevating ram through filler opening 3 again to actuator port 4, makes the compartment be in the lifting state; When overpressure, can be by relief valve 7 releases in the guiding valve 2; In the process of lifting, the oil cylinder of dump truck tilts to certain position and contacts with touching lever 14, and guiding valve 2 is moved to right vertically, and filler opening 3, actuator port 4 are communicated for 5 mouthfuls with return opening, reaches the purpose of setting oil cylinder position;

Embodiment two

By Fig. 4, Fig. 5, shown in Figure 6, this embodiment's dump truck hydraulic stop lifting valve, comprise that inner flow passage is the combinaing valve body 21 of three slot type structures, supporting with it guiding valve 22, combinaing valve body 21 is provided with filler opening 23, actuator port 24 and return opening 25, one one-way valve 26 is plugged in filler opening 23, in guiding valve 22, be provided with and be communicated with filler opening 23, the relief valve 27 of actuator port 24 and return opening 25, one end of guiding valve 22 is connected with a main piston 28, main piston 28 and the Returnning spring 29 supporting with it are loaded on respectively in the two

end cap

30 and 31 of combinaing valve body 21, end cap 30 is provided with medium import 32 and reverse media import 33, in end cap 30, also be provided with fine motion piston 34, fine motion piston 34 is provided with medium import 35 in the bottom of end cap 30 between the bottom of main piston 28 and end cap 30; The other end of guiding valve 22 is positioned at outside the combinaing valve body 21 and by screw thread and is provided with touching lever 36, and sign back-up ring 37 is installed;

When medium import 32 and reverse media import 33 all do not feed flowing medium, guiding valve 22 is in meta, filler opening 23 cuts off with actuator port 24 and return opening 25, the superpressure oil of filler opening 23 flows back to fuel tank by relief valve 27 by return opening 25, oil cylinder is in halted state, realizes that the safety in compartment stops; Put in place when medium import 32 feeding fluids promotion main pistons 28 drive guiding valves 22 move to left, filler opening 23 is communicated with actuator port 24, and pressure oil enters the oil cylinder of dump truck, realizes the lifting in compartment, and when overpressure, superpressure fluid is by relief valve 27 releases; Move to right when reverse media import 33 feeds fluid promotion guiding valve 22, make filler opening 23, actuator port 24 is communicated with return opening 25, and fuel tank is flowed back in the equal release of each hydraulic fluid port hydraulic oil, and the compartment descends.In the process that descends, feed pressure medium as medium import 35, make the stroke of fine motion piston 34 fine motions restriction main piston 28, make filler opening 23 and actuator port 24 and return opening 25 form throttling oil return state, realize falling slowly of oil cylinder; In the process of lifting, the oil cylinder of dump truck tilts to certain position and contacts with touching lever 36, and guiding valve 22 is moved to right vertically, makes filler opening 23, and actuator port 24 communicates with return opening 25, reaches the purpose of setting oil cylinder position.

Claims

1. dump truck hydraulic stop lifting valve, comprise combinaing valve body, supporting guiding valve with it, combinaing valve body is provided with filler opening, actuator port and return opening, one end of guiding valve is connected with a main piston, main piston and the Returnning spring supporting with it are loaded in the end cap of combinaing valve body, end cap is provided with the medium import, it is characterized in that an one-way valve is loaded on filler opening, and the other end of guiding valve is positioned at outside the combinaing valve body and is provided with touching lever.

2. dump truck hydraulic stop lifting valve as claimed in claim 1 is characterized in that described combinaing valve body inner flow passage is two slot type structures.

3. dump truck hydraulic stop lifting valve as claimed in claim 1 is characterized in that described combinaing valve body inner flow passage is three slot type structures, also is provided with the reverse media import on the end cap that main piston is installed.

4. as the described dump truck of claim 1 to 3 hydraulic stop lifting valve, it is characterized in that also being provided with the sign back-up ring at an end of the guiding valve that is provided with touching lever.

5. dump truck hydraulic stop lifting valve as claimed in claim 4 is characterized in that being provided with the relief valve that is communicated with filler opening, actuator port and return opening in guiding valve.

6. dump truck hydraulic stop lifting valve as claimed in claim 5, it is characterized in that in the end cap of the combinaing valve body that main piston is installed, also being provided with the fine motion piston, the fine motion piston is provided with the medium import in the bottom of end cap between the bottom of main piston and end cap.