CN2465011Y

CN2465011Y - Overflow valve for engineering machinery

Info

Publication number: CN2465011Y
Application number: CN 01216093
Authority: CN
Inventors: 尹建; 阴聚生
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-20
Filing date: 2001-01-20
Publication date: 2001-12-12
Anticipated expiration: 2011-01-20

Abstract

The utility model relates to an overflow valve for engineering machinery, which has the structure that the utility model is composed of an overflow valve and a starting valve. A main flow valve is composed of a main flow valve body, a main flow valve core, a throttling push rod and a restoring spring, and the starting valve is composed of a starting valve body, adjusting bolts, a valve cap, a reset spring and a steel ball. The right end of the starting valve is fixed with the left end of the main flow valve together by threads and a locking steel ring, and a sealing ring is arranged between the right end of the starting valve and the left end of the main flow valve. Compared with the prior art, the overflow valve for engineering machinery has the advantages of reasonable design, simple structure, easy manufacture, small size, convenient installation and operation, good stability, high sensitivity, and good on-off performance; the production cost can be reduced by more than 50%, and the characteristics such as the inertia machine shake and swing, etc. of a hydraulic device can be completely eliminated when the hydraulic device is used.

Description

The special-purpose relief valve of engineering machinery

The utility model relates to a kind of relief valve, specifically a kind of special-purpose relief valve of plug-in type engineering machinery that can improve loader hydraulic equipment operation stability.

In hydraulic equipment, transship for the high pressure that prevents oil circuit, in high-pressure oil passage,, starter gate valve carries out pressure limiting by being set, the switch that the in use existing deficiency of the starter gate valve of prior art is a valve plug all is to finish moment, or open or close, the frequent result of switch makes hydraulic equipment produce inertia machinery runout in running, influence the continuity and the stability of the operation of equipment, also can influence the working life of starter gate valve and the working life of other mechanical part simultaneously.

The purpose of this utility model provides a kind of buffer starting that has, and flexible earial drainage reduces pressure, and can eliminate the special-purpose relief valve of engineering machinery of inertia machinery runout.

The purpose of this utility model realizes in the following manner, add a trimmer valve in the front portion of conventional starter gate valve, the Current limited Control of working fluid is made the switch generation time-delay of starter gate valve by trimmer valve, thereby the starter gate valve of having eliminated prior art in use the pressure height just open, pressure is low just to close, and frequent switch is in operation hydraulic equipment and produces the drawback of the mechanical runout of inertia.

Accompanying drawing is the structural representation of the special-purpose relief valve of engineering machinery.

Explain below with reference to Figure of description overflow valve for engineering machinery of the present utility model being done.

Engineering machinery special use of the present utility model, its structure of overflow valve is to be made of starter gate valve and main flow valve, and is main Stream valve formed by main flow valve body 1, main flow spool 13, throttling push rod, back-moving spring 15, starter gate valve be by Start valve body 9, adjustment bolt 23, head protector 11, back-moving spring 22 and steel ball 20 and form the right side of starter gate valve End is fixed together by screw thread and locking steel loop 16 with the left end of main flow valve, also is provided with sealing between the two Ring 17.

The main flow spool 13 of center drilling is arranged among the main flow valve pocket 6 at main flow valve body 1 center, by disk 5 and left and right sides stock 18, the 14 cross throttling push rods of forming are arranged in the center hole of main flow spool 13, the left surface of disk 5 has throttling groove 24, the left stock 18 that joins with disk 4 left surfaces is inserted in to start in the valve port 19 and joins with steel ball 20, the right side of disk 5 is provided with circle and lacks shape spring seat 4, the cross section of the right stock 14 that joins with disk 5 right sides is a D shape, the cross section is that the right-hand member of the right stock 14 of D shape passes in the center hole that Returnning spring 15 is inserted in main flow spool 13, Returnning spring 15 is positioned among the shrinkage pool of disk 5 and main flow spool 13 left surfaces, the right-hand member of right stock 14 joins with the main flow valve port 12 of main flow valve body 1 right-hand member, and the middle part of main flow valve body 1 has with the axial perpendicular main discharge orifice 3 of main flow valve pocket 6 and is inlaid with the groove of seal ring 2.

The center that starts valve body 8 has and starts valve pocket 8, the right-hand member of adjusting bolt 23 is drilled with blind hole, Returnning spring 22, spring seat 21 and steel ball 20 are fixed among the startup valve pocket 8 by adjustment bolt 23, startup valve port 19 left ends that steel ball 20 communicates with main flow valve pocket 6 join, locking nut 10 is fixed on the left end of adjusting bolt 23, be provided with seal ring between locking nut 10 and the startup valve body 9, the right-hand member of protective hat 11 is fixed on the left end that starts valve body 9 by screw thread, protective hat 11 is positioned at the outside of locking nut 10, is positioned at the side that starts valve body 9 right-hand members and also has a secondary discharge orifice 7.

Embodiment:

Special-purpose its processing and fabricating of relief valve of engineering machinery of the present utility model is very simple and convenient, gets final product by traditional process for machining processing shown in the by specification accompanying drawing.

The working principle of the special-purpose relief valve of engineering machinery of the present utility model is as follows:

In use right-hand member and the high-pressure oil passage owing to the main flow valve body joins, so when oil circuit produces pressure, the circle of hydraulic oil from the T-section stream push rod disk of filler opening through main flow spool center hole of main flow valve body right-hand member lacks, in the main flow valve pocket in the left side that flows into the main flow spool in the breach on the stock in D type cross section, produce back pressure, steel ball slowly will start valve port and open under the promotion of back pressure, because pressure improves constantly, after pressure reduction appears in throttling push rod two ends, the throttling push rod moves to left, the steel ball that starts on the valve port is opened, and the hydraulic oil in the main flow valve pocket enters the startup valve pocket and discharges through secondary discharge orifice, and the pressure of main flow valve pocket left end descends gradually; Continue to rise as main flow spool right atrial pressure, force the main flow spool to continue to move to left the filler opening of main flow valve body right-hand member and main discharge orifice are connected, hydraulic oil is discharged through main discharge orifice and is realized step-down.Pressure in the earial drainage rear oil duct descends, and the main flow spool moves to right under the effect of Returnning spring and closes main flow valve, and the Returnning spring in the startup valve pocket promotes steel ball simultaneously and closes the startup valve port.

The purpose that throttling groove is set on the disk of throttling rod is: disk enters in the shrinkage pool that starts the valve body right-hand member when throttling rod moves to left, and makes the reduced cross-sectional area of shrinkage pool, has produced throttling action, has improved the stability of pressure.The breakdown disk occurs as the Returnning spring in the starter gate valve and enter the shrinkage pool bottom, have only this moment throttling groove to form the loop, can set up the back pressure under the normal operating pressure, this apparatus features can guarantee the proper functioning under the little load of equipment, can not cause equipment paralysis suddenly to shut down.

Overflow valve for engineering machinery of the present utility model is compared with existing technology, and has reasonable in design, structure Simply, be easy to processing, little, easy to install, the good stability of volume, production cost reduce by 50% with On, and can eliminate the hydraulic test characteristics such as inertia mechanical runout in use fully, thereby, tool Good popularizing value is arranged.

Except the described technical characterictic of specification, be the known technology of those skilled in the art.

Claims

1. the special-purpose relief valve of engineering machinery, comprise starter gate valve and main flow valve, it is characterized in that main flow valve is made up of main flow valve body, main flow spool, throttling push rod, Returnning spring, starter gate valve is formed by starting valve body, adjustment bolt, protective hat, Returnning spring and steel ball, the right-hand member of starter gate valve and the left end of main flow valve are fixed together by screw thread and locking steel loop, also are provided with seal ring between the two.

2. the special-purpose relief valve of engineering machinery according to claim 1, the main flow spool that it is characterized in that center drilling is arranged among the main flow valve pocket at main flow valve body center, the cross throttling push rod of being made up of disk and left and right sides stock is arranged in the center hole of main flow spool, the left surface of disk has throttling groove, the left stock that joins with the disk left surface is inserted in to start in the valve port and joins with steel ball, the right side of disk is provided with circle and lacks the shape spring seat, the cross section of the right stock that joins with the disk right side is a D shape, the cross section is that the right-hand member of the right stock of D shape passes in the center hole that Returnning spring is inserted in the main flow spool, Returnning spring is positioned among the shrinkage pool of disk and main flow spool left surface, the right-hand member of right stock joins with the main flow valve port of main flow valve body right-hand member, and the middle part of main flow valve body has with the axial perpendicular main discharge orifice of main flow valve pocket and is inlaid with the groove of seal ring.

3. the special-purpose relief valve of engineering machinery according to claim 1, it is characterized in that the center that starts valve body has the startup valve pocket, the right-hand member of adjusting bolt is drilled with blind hole, Returnning spring, spring seat and steel ball are bolted among the startup valve pocket by adjustment, the startup valve port left end that steel ball communicates with the main flow valve pocket joins, locking nut is fixed on the left end of adjusting bolt, be provided with seal ring between locking nut and the startup valve body, the right-hand member of protective hat is fixed on the left end that starts valve body by screw thread, protective hat is positioned at the outside of locking nut, is positioned at the side that starts the valve body right-hand member and also has a secondary discharge orifice.