CN200999773Y

CN200999773Y - Limit valve

Info

Publication number: CN200999773Y
Application number: CNU200720100419XU
Authority: CN
Inventors: 李向宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-19
Filing date: 2007-01-19
Publication date: 2008-01-02
Anticipated expiration: 2017-01-19

Abstract

The utility model relates to a servo motor system element, in particular to a fluid distributing or supplying device with the characteristic of being suitable for a servo motor controlling. A limiting valve comprises a pushing rod, a screw head, a valve body, a sealing gasket, a piston, a piston, a spring, a bottom cover, a connector and fixing nuts, an air exhaust hole connecting with the atmosphere is arranged on the screw head, the connector is welded on the side surface of the valve body, an air outlet mouth is arranged on the connector, an air inlet mouth is arranged on the bottom cover, the sealing gasket and the piston are an integrated structure, and a breathing hole is arranged on the bottom of the piston. The utility model can effectively eliminate the dust dropping in the air exhaust hole, the reliability is high, and the service life of the valve body is long.

Description

Limited valve

Technical field

The utility model relates to the element of servomotor control system, is specifically related to a kind of servomotor that is applicable to and is controlled to be the fluid distribution or the supplier of feature.

Background technique

In the prior art,,, be easy to stop up, make limited valve slow movement, performance unreliable because the exhaust port latus rectum is less though employed limited valve can be controlled stopping automatically of carriage of dump truck on the dump truck; In use, when the limited valve exhaust port stopped up, the compartment can not stop automatically, can cause the damage of vitals such as compartment, oil hydraulic cylinder.

As Chinese publication CN2854162Y, a kind of gas control limited valve is disclosed, it comprises valve body and valve rod, have spacing cross-drilled hole at the middle part of valve body, the sidewall of valve body is provided with suction port, air outlet and exhaust port, be connected by vent respectively between suction port and air outlet and the described spacing cross-drilled hole, described valve rod is arranged on a side of spacing cross-drilled hole, opposite side mounting spring.It has increased airstrainer, can prevent the pollution of valve body within the specific limits, has kept its cleaning inside, has prolonged the working life of valve body.But because the seal ring that is provided with directly contacts with body wall, the air outlet hole aperture of causing its sidewall to be provided with can not be too big, so the Throughput of air outlet hole is still very little, is difficult for getting rid of when exhaust port falls into foreign material; And push rod and piston are structure as a whole, and when both decentraction, are easy to produce the hair fastener phenomenon when mounted.

Summary of the invention

Purpose of the present invention is exactly to overcome above-mentioned defective by the shape that changes piston and the position of sealing gasket, provides a kind of and can remove dust in the exhaust port timely and effectively, is active in one's movements, the limited valve of reliable performance.

For achieving the above object, the present invention adopts following technological scheme: comprise push rod, silk head, valve body, sealing gasket, piston, spring, bottom, joint and set screw nut, the silk head is provided with the exhaust port that communicates with atmosphere, joint is welded on the side of valve body, set out gas port on the joint, suction port is set on the bottom, and sealing gasket and piston are structure as a whole, and the bottom surface of piston is provided with vent.

Sealing gasket is positioned at the top of piston, and it is into a single integrated structure that sealing gasket all the other each faces except that upper side all are wrapped in internal piston; Side at piston is provided with circular groove, and the vent that circular groove and piston base are provided with connects, and when the compartment lifting, pressurized gas is communicated with the air outlet by vent by suction port, because the air outlet connects the lifting valve of car, thus the work of control lifting valve; When compartment arrival requires the position, push rod is depressed in the compartment, push rod promotes piston and moves down, sealing gasket breaks away from the silk head, and spring is compressed, and the air outlet communicates with exhaust port, pressurized air in the lifting valve flows into exhaust port by the air outlet, the air outlet air pressure descends rapidly, the lifting valve return, and the compartment stops lifting.Because sealing gasket breaks away from the silk head, suction port also communicates with exhaust port through vent, and the pressurized air of suction port is also discharged by exhaust port through vent, because the tolerance in the inlet hole is bigger, therefore can more effectively the dust in the exhaust port be got rid of clean.When push rod was lifted, under the effect of pressure spring, sealing gasket and piston reset had cut off being communicated with of each gas port and relief opening, finish a work cycle.Because push rod and piston are non-integrative-structure, so even both decentraction can not produce the hair fastener phenomenon yet in the lifting working procedure.

The utility model can effectively be removed the dust that falls in the exhaust port, its reliability height, the long service life of valve body.

Description of drawings

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

Embodiment

The utility model comprises push rod 1, silk 2, valve body 3, sealing gasket 8, piston 4, spring 5, bottom 6 and set screw nut 7, silk 2 is provided with exhaust port C and communicates with atmosphere, joint 9 is welded on the side of valve body 3, set out gas port D on the joint 9, suction port A is set on the bottom 6, the bottom surface of piston 4 is provided with vent B, suction port A is communicated with air outlet D through vent B, sealing gasket 8 is structure as a whole with piston 4, side at piston 4 is provided with circular groove, and the vent B that circular groove and piston 4 bottoms are provided with connects, and is fixed with sealing gasket 8 on the piston 4 and seals, when limited valve was not worked, suction port A did not all communicate with exhaust port C with air outlet D.Suction port A connects the dumping car control valve, and air outlet D connects the dumping car lifting valve, when the dumping car lifting, the control valve in the driver control operator cabin, make pressurized air by suction port A through vent B, air outlet D to the dumping car lifting valve, the compartment begins lifting; When the compartment gives rise to when requiring the position, push rod 1 is depressed in the compartment, push rod 1 promotes piston 4 and moves down, sealing gasket 8 and silk 2 disengaging, air outlet D communicates with exhaust port C, and the pressurized air in the lifting valve flows into exhaust port C by air outlet D, and air outlet D air pressure descends rapidly, the lifting valve return, the compartment stops lifting.Because sealing gasket 8 and silk 2 disengaging, suction port A also communicates with exhaust port C through vent B, and the pressurized air of suction port A is also discharged by exhaust port C through vent B, because tolerance is bigger, therefore can more effectively the dust in the exhaust port C be got rid of totally.

Claims

1. limited valve, comprise push rod, silk head, valve body, sealing gasket, piston, spring, bottom, joint and set screw nut, the silk head is provided with the exhaust port that communicates with atmosphere, joint is welded on the side of valve body, set out gas port on the joint, suction port is set on the bottom, it is characterized in that sealing gasket and piston are structure as a whole, the bottom surface of piston is provided with vent.

2. limited valve according to claim 1 is characterized in that the non-integrative-structure of push rod and piston.

3. limited valve according to claim 1 and 2 is characterized in that the side of piston is provided with circular groove, and the vent that circular groove and piston base are provided with connects.

4. limited valve according to claim 3 is characterized in that sealing gasket is positioned at the top of piston.

5. limited valve according to claim 4 is characterized in that sealing gasket all the other each faces except that upper side all are wrapped in internal piston.