CN2424057Y

CN2424057Y - Pneumatic controlled lifting valve

Info

Publication number: CN2424057Y
Application number: CN 00235489
Authority: CN
Inventors: 黄培华
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-09
Filing date: 2000-06-09
Publication date: 2001-03-21
Anticipated expiration: 2010-06-09

Abstract

The utility model relates to a pneumatic controlled lifting valve which is composed of a valve body and a valve core assembled in the valve body, wherein, an air cavity chamber, a pressure cavity chamber, and an oil return cavity chamber are arranged in the valve body. The valve core comprises an air piston, a valve rod connected into one body with the air piston a return spring, and a guide sleeve. The guide sleeve is sheathed between the air cavity chamber and the pressure cavity chamber. The valve rod passes through the air cavity chamber, the pressure cavity chamber, and the oil return cavity chamber. The return spring is sheathed on the valve rod in the air cavity chamber. The valve rod is provided with a sealing face to assemble the pressure cavity chamber and the oil cavity chamber. The valve not only increases sealing effect, but also reduces the abrasion between sealing faces. Oil leaking amount is less than 0.2 ml/mih. The service life of the valve can be increased more than two hundred thousand times. Simultaneously, the valve has compact integral structure, small size, and 2.5 kg weight.

Description

The air control lifting valve

The utility model relates to a kind of and the matching used air control lifting valve of dumping truck hydraulic control system.

Chinese patent literature discloses the technical scheme of a kind of " heavy dump truck gas control combined artificial lift valve " with notification number CN 2212100 on November 8th, 95.It is provided with the spacing valve pocket that is interconnected, the gentle cylinder of safe valve pocket in valve body, on the appropriate location of spacing valve pocket, have and extraneous oil input channel and the back oil road that communicates, check valve that can open or close oil input channel and the limit valve that can close check valve are arranged in the spacing valve pocket.With the lifting that opens or closes the modulated pressure cylinder of check valve, in the action that stops and descend, the hermetically-sealed construction of this valve adopts steel ball sealing, with the ejection of steel ball or reset and realize opening or closing of valve, then clash into the once sealing band at steel ball of the every switching of steel ball, make the sealing band wearing and tearing heavy, in let out increase, reduce service life.

The purpose of this utility model is to provide the air control lifting valve of a kind of simple in structure, good sealing effect, long service life.

The purpose of this utility model is achieved in that this valve comprises valve body and is located at the interior spool of valve body, be provided with gas chamber and pressure chamber and oil return chamber in the said valve body, described spool comprises gas piston and the valve rod that is connected as a single entity with the gas piston, return spring and orienting sleeve, orienting sleeve is located between gas chamber and the pressure chamber, valve rod is indoor through gas chamber and pressure chamber and oil back chamber, return spring is set on the valve rod in the gas chamber, and valve rod is provided with the sealing surface that is assemblied between pressure chamber and oil return chamber.

An equipped pressure regulating device between described pressure chamber and oil return chamber, described pressure regulating device comprises the pressure limiting oilhole of being located on the valve body of sealing surface both sides that communicates with pressure chamber and oil return chamber and is located at the pressure limiting path that communicates with the pressure limiting oilhole of stem cavity and the limiting valve that is assemblied in body cavity, limiting valve is made of pressure regulation plug and pressure limiting spring and the sliding plug be located between the two, and its sliding beyond the Great Wall sealing surface is located between the two pressure limiting oilholes.Install bilayer " zero " shape seal ring on the periphery of gas piston additional, and at the equipped cushion rubber of its front end.

The technological advance that the utility model is obtained: this valve adopts gas piston and valve rod to be the tapered plug hermetically-sealed construction of one and to install automatic reset device additional, not only improved sealing effectiveness, its dredge oil amount is less than 0.2ml/mih, and greatly reduce wearing and tearing between sealing surface, brought up to more than 200,000 times the service life of valve.The compact overall structure of while valve, its cylinder bore diameter is 5cm, weight only has 2.5kg.

Be that embodiment further describes the utility model below with the accompanying drawing:

Fig. 1 is a structural representation of the present utility model.

As shown in Figure 1, this valve mainly is made of valve body 1 and the spool that is assemblied in the valve body 1, is provided with gas chamber 2 and pressure chamber 13 and oil return chamber 15 in the valve body 1.Oil inlet 18 that on valve body 1 left surface and trailing flank, is respectively equipped with the admission port 17 that is connected with gas chamber 2 and is connected with pressure chamber 13 and the oil outlet 19 that communicates with oil return chamber 15.Spool by be located in the gas chamber 2 gas piston 4 and and the valve rod 7 that is connected as a single entity of gas piston 4, be located at the orienting sleeve 12 between gas chamber 2 and the pressure chamber 13 and the return spring 6 that is set on gas chamber's 2 inner valve stem 7 constitutes, valve rod 7 is in gas chamber 2, pressure chamber 13 and oil return chamber 15, and the middle part of valve rod 7 is a tapered plug shape sealing surface structure 16.Sealing face structure 16 is used for break-make between control presssure chamber 13 and the oil return chamber 15.In order to improve the sealing effectiveness of gas piston, on its periphery, install bilayer " zero " shape seal ring 5 additional.Simultaneously for the cushion effect that prevents valve rod 7 produces noise, installed a cushion rubber 3 additional at the front end of gas piston 4.

For effectively prevent this valve in use oil pressure surpass nominal working pressure.Between pressure chamber 13 and oil return chamber 15, install a pressure regulating device additional, the main body of this mechanism is located in the chamber of hollow form valve rod 7, it mainly comprises the pressure limiting oilhole that communicates with pressure chamber 13 and oil return chamber 15 be located on the sealing surface 16 both sides valve rods 7 20 and is located at the pressure limiting path that communicates with pressure limiting oilhole 20 in valve rod 7 inner chambers and is assemblied in limiting valve in the pressure limiting path, limiting valve is made of pressure regulation plug 10 and pressure limiting spring 8 and the sliding plug 9 be located between the two, and its sliding plug 9 is the sealing surface of limiting valve with contacting of 10 of pressure regulation plugs.

This valve and the supporting use of dumping truck hydraulic efficiency pressure system, working process when it is applied to this system: 1, lifting and in stop: operating handle is placed lift location, pressurized air enters gas chamber 2 by admission port 17, promote 7 generations of gas piston 4 drive valve rods and move to right the tapered plug sealing surface 16 confining pressure chambers 13 at valve rod 7 middle parts and the path between the oil return chamber 15.Start oil pump, the delivery line of pressure oil through being communicated with oil inlet 18 enters hydraulic ram, promptly realizes lifting.In the lifting process, stop oil pump work, promptly realize hydraulic ram in stop.2, spacing: in the lifting process, if during the over proof operation pressure of pressure oil, pressure regulating device work, be that the sealing surfaces that the hydraulic oil in the pressure chamber 13 is exchanged tamponade 10 and sliding plug 9 formations through the pressure limiting oilhole 20 in left side produce a pressure, when thrust that this pressure is produced greater than pressure limiting spring 8, then open sliding plug 9, hydraulic oil enters oil return chamber 15 through the pressure limiting oilhole 20 on right side, thereby has kept the pressure in the pressure chamber 13 to be no more than rated value.Improved the safety of equipment effectively.3, descend: operating handle is placed lowering position, promptly turn-off source of the gas and oil pump, gas piston 4 promotes valve rod 7 and moves to left under the effect of return spring 6, sealing surface 16 is removed sealing, the pressure oil of oil cylinder flows into fuel tank through oil inlet 17, pressure chamber 13, oil return chamber 15 and oil outlet 19, promptly realizes the action that descends.Number in the figure 11 is a seal ring, and label 14 is a back-up ring.

Claims

1, a kind of air control lifting valve, it comprises valve body and is fitted to the interior spool of valve body, it is characterized in that being provided with in the said valve body gas chamber and pressure chamber and oil return chamber, described spool comprises gas piston and the valve rod that is connected as a single entity with the gas piston, return spring and orienting sleeve, orienting sleeve is located between gas chamber and the pressure chamber, valve rod is indoor through gas chamber and pressure chamber and oil back chamber, return spring is set on the valve rod in the gas chamber, and valve rod is provided with the sealing surface that is assemblied between pressure chamber and oil return chamber.

2, air control lifting valve according to claim 1, it is characterized in that equipped pressure regulating device between said pressure chamber and oil return chamber, described pressure regulating device comprises the pressure limiting oilhole of being located on the valve body of sealing surface both sides that communicates with pressure chamber and oil return chamber and is located at the pressure limiting path that communicates with the pressure limiting oilhole of stem cavity and the limiting valve that is assemblied in body cavity, limiting valve is made of pressure regulation plug and pressure limiting spring and the sliding plug be located between the two, and its sliding beyond the Great Wall sealing surface is located between the two pressure limiting oilholes.

3, air control lifting valve according to claim 1 and 2 is characterized in that installing bilayer " zero " shape seal ring additional on the periphery of said gas piston, and at the equipped cushion rubber of its front end.