CN201354779Y

CN201354779Y - Hydraulic balanced valve

Info

Publication number: CN201354779Y
Application number: CN 200920036864
Authority: CN
Inventors: 赵家文
Original assignee: Nanjing Institute of Industry Technology
Current assignee: Nanjing Institute of Industry Technology
Priority date: 2009-02-26
Filing date: 2009-02-26
Publication date: 2009-12-02
Anticipated expiration: 2019-02-26

Abstract

The utility model discloses a hydraulic balanced valve, which comprises a lower valve body, an upper valve body, a lower valve cover and an upper valve cover, wherein the lower valve body and the upper valve body are fixedly connected into one body, the lower valve cover is fixedly connected on the lower valve body, the upper valve cover is fixedly connected on the upper valve body, a shaft line along the lower valve body and the upper valve body is equipped with a top bar, a valve core of a one-way valve, a one-way valve spring, a lower pressure plate, a balanced spring, an upper pressure plate, a valve sleeve of a pressure reducing valve, a restoring spring, a valve core of a throttle valve and an adjust lever of the throttle valve in turn. The hydraulic balanced valve can regulate and control the moving speed of a workpiece according to the requirements of working occasions, when load is changed, the moving speed of the workpiece can be guaranteed without changing, and a piston and the workpiece can be locked on any position, and the position precision is higher.

Description

Hydraulically balanced valve

Technical field

The utility model relates to a kind of hydrovalve, specifically a kind ofly is used for engineering machinery, Hoisting Machinery hydraulic system oil hydraulic cylinder is vertically placed, and makes the hydrovalve of vertical motion occasion.

Background technique

Vertical positioned hydraulic cylinders tend to glide voluntarily because of the gravity of vertical motion workpiece, or speed is out of control when workpiece is descending.In order to prevent that this phenomenon from taking place, the hydraulic element that can produce certain back pressure often are set in hydraulic system, go up at an arbitrary position with the assurance piston locked, and falling speed that can the Control work parts.What equilibrium valve often used is the hydraulic element that can produce back pressure.Existing equilibrium valve in use often exposes two problems: (1) owing to there is leakage, piston can not be parked in the arbitrary position for a long time, so the positional accuracy of locking is not high; (2) only be suitable for fixed load, when load variations, descent of piston speed will change thereupon.

Summary of the invention

In order to overcome the problem that prior art exists, the purpose of this utility model provides a kind of hydraulically balanced valve, this equilibrium valve can require the movement velocity of adjusting and Control work parts according to the workplace, when load changes, the movement velocity that can guarantee workpiece is constant, and it is locked that piston and workpiece are gone up at an arbitrary position, and positional accuracy is higher.

The purpose of this utility model is achieved through the following technical solutions:

A kind of hydraulically balanced valve is characterized in that: it comprises valve body and upper valve body down, and following valve body and upper valve body fix as one; Be provided with bottom flange in following valve body lower end, be provided with bonnet in the upper valve body upper end; In the cavity that valve body and upper valve body constitute down, be provided with push rod, one-way valve spool, check valve spring, balance spring, reduction valve valve pocket, Returnning spring and throttle valve spool, the lower end of one-way valve spool contacts with push rod, the following end in contact of upper end and check valve spring; The upper end of check valve spring contacts with the throttle valve spool; Balance spring is arranged on down the connection part of valve body and upper valve body, is provided with press table at the balance spring downside, is provided with top board at the balance spring upside; Reduction valve valve pocket lower end is arranged on the top board, and the upper end contacts with Returnning spring; On the throttle valve spool, be provided with the throttle valve adjustment handle; On bottom flange, be provided with the K mouth,, on upper valve body, be provided with the A mouth being provided with the T mouth on the valve body down.

The utility model circumferentially evenly is furnished with six circular holes in one-way valve spool, press table and top board upper edge.

Be furnished with two orthogonal circular holes on the throttle valve spool, communicate with two end faces of spool respectively along the circular hole of valve core axis's direction; The circular hole vertical with the valve core axis direction communicates with the outer round surface of spool respectively.

After hydraulically balanced valve had assembled, in following valve body, a chamber of push rod lower end communicated with the K mouth; The b chamber at push rod place communicates with the T mouth.Check valve spring, balance spring and Returnning spring all are compressed at this moment, and the elastic force that check valve spring produces acts on respectively on one-way valve spool and the throttle valve spool; The elastic force that balance spring produces acts on down on valve body and the upper valve body by press table, top board respectively; The elastic force that Returnning spring produces acts on respectively on bonnet and the reduction valve valve pocket.

A mouth during work on the upper valve body links to each other with vertical positioned hydraulic cylinders cavity of resorption, and the K mouth on the bottom flange links to each other with vertical positioned hydraulic cylinders epicoele or control oil sources, and the T mouth on the following valve body links to each other with the fuel tank direction.

When piston drive load moves downward, the fluid of oil hydraulic cylinder cavity of resorption is by the A mouth of upper valve body, through the h chamber of reduction valve valve pocket, the e chamber of bonnet, and enter the d chamber of equilibrium valve through restriction on the throttle valve spool, this moment, the pilot pressure oil of oil hydraulic cylinder epicoele or control oil sources entered a chamber by the K mouth on the bottom flange, promote the push rod motion and the one-way valve spool is pushed away valve port, make d cavity pressure oil enter the b chamber through the center hole and the one-way valve valve port of c chamber, press table, flow out through the T mouth again by the upper press cover center hole.

When load becomes big, A mouth and f cavity pressure become big thereupon, promote reduction valve valve pocket and top board compression balance spring, passage section area between A mouth and the reduction valve valve pocket h chamber is reduced, pressure oil increases through the out-of-date pressure loss, thereby the pressure that enters h chamber and e chamber is descended, and guarantees that the pressure difference before and after the throttle valve throttling spool mouth is constant substantially, thereby guarantee that flow is constant, make the descending movement velocity of workpiece constant.

When piston moves upward, pressure oil enters the b chamber by the T mouth, because this moment, pressure direction was consistent with the one-way valve opening direction, so the one-way valve spool is open under the effect of pressure, pressure oil is through the one-way valve valve port, aperture on the one-way valve spool, the center hole of press table and aperture enter the c chamber, and the reduction valve valve pocket is pushed into step place on the regulating handle valve gap by the aperture on the top board, h chamber on the reduction valve valve pocket communicates with g chamber on the bonnet, c chamber fluid enters the d chamber, and the g chamber on throttle valve center spool hole and bonnet, the h chamber on the reduction valve valve pocket and the A mouth of upper valve body flow out.

Compared with prior art, the utility model can require the movement velocity of adjusting and Control work parts according to the workplace, when load changes, can guarantee that the movement velocity of workpiece is constant, and it is locked that piston and workpiece are gone up at an arbitrary position, and positional accuracy is higher.

Description of drawings

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

Fig. 2 is piston internal structure schematic representation of the present utility model when driving load and moving downward;

Fig. 3 is an A mouth place partial enlarged drawing among Fig. 2;

Fig. 4 is piston internal structure schematic representation of the present utility model when moving upward.

Main mark explanation in the accompanying drawing:

1-bottom flange 2-bottom flange seal ring

Valve body 4-press table under the 3-

5-top board 6-reduction valve valve pocket

7-upper valve body 8-Returnning spring

9-bonnet 10-throttle valve adjustment handle

11-bonnet seal ring 12-throttle valve spool

13-check valve spring 14-balance spring

15-one-way valve spool 16-push rod

17-push rod seal ring

Embodiment

Describe the utility model in detail below in conjunction with drawings and Examples.

As shown in Figure 1, a kind of hydraulically balanced valve, it comprises valve body 3, upper valve body 7, bottom flange 1, bonnet 9 down, and following valve body 3 fixes as one with upper valve body 7, and bottom flange 1 is fixed in down on the

valve body

3, and 1 place is provided with bottom flange seal ring 2 at bottom flange.Bonnet 9 is fixed on the

upper valve body

7, and 9 places are provided with bonnet seal ring 11 at bonnet.Valve body 3 is equipped with push rod 16, one-way valve spool 15, check valve spring 13, press table 4, balance spring 14, top board 5, reduction valve valve pocket 6, Returnning spring 8, throttle valve spool 12 and throttle valve adjustment handle 10 according to this with the axis of upper valve body 7 under the edge.The lower end of one-way valve spool 13 contacts with push rod 16, the following end in contact of upper end and check valve spring 13; The upper end of check valve spring 13 contacts with throttle valve spool 12; 16 places are provided with push rod seal ring 17 at push rod.Balance spring 14 is arranged on down the connection part of valve body 3 and upper valve body 7, is provided with press table 4 at balance spring 14 downsides, is provided with top board 5 at balance spring 14 upsides; Reduction valve valve pocket 6 lower ends are arranged on the top board 5, and the upper end contacts with Returnning spring 8; On throttle valve spool 12, be provided with throttle valve adjustment handle 10; On bottom flange 1, be provided with the K mouth,, on upper valve body 7, be provided with the A mouth being provided with the T mouth on the valve body 3 down.

After hydraulically balanced valve had assembled, a chamber in the following valve body 3 communicated with the K mouth; The b chamber communicates with the T mouth.Check valve spring 13, balance spring 14 and Returnning spring 8 all are compressed at this moment, and the elastic force that check valve spring 13 produces acts on respectively on one-way valve spool 15 and the throttle valve spool 12; The elastic force that balance spring 14 produces acts on down on valve body 3 and the upper valve body 7 by press table 4 and top board 5 respectively; The elastic force that Returnning spring 8 produces acts on respectively on bonnet 9 and the reduction valve valve pocket 6.

A mouth during work on the upper valve body 7 links to each other with vertical positioned hydraulic cylinders cavity of resorption, and the K mouth on the bottom flange 1 links to each other with vertical positioned hydraulic cylinders epicoele or control oil sources, and the T mouth on the following valve body 3 links to each other with the fuel tank direction.

When piston drive load moves downward, the fluid of oil hydraulic cylinder cavity of resorption enters the f chamber by the A mouth of upper valve body 3, reduction valve valve pocket 6 is under the effect of f chamber oil liquid pressure, valve body 3 directions move downwards, and by top board 5 compression balance springs 14, until reaching balance, as shown in Figure 2, and determined that thus fluid enters the channel size X in f chamber by the A mouth, as shown in Figure 3.

At the same time, A mouth fluid is through the h chamber of reduction valve valve pocket 6, the e chamber of bonnet 9, and the restriction on throttle valve spool 12 enters the d chamber, and flow is determined by the passage section area of restriction on the throttle valve spool 12, and determined that thus piston drives the speed that load moves downward.

This moment, the pilot pressure oil of oil hydraulic cylinder epicoele or control oil sources entered a chamber by the K mouth on the bottom flange 1, promote push rod 16 and push away valve port to the motion of upper valve body 7 directions and with one-way valve spool 15, make the center hole of d chamber fluid by top board 5 through the c chamber, the center hole of press table 4 and the valve port of one-way valve spool 15 enter the b chamber, flow out through the T mouth again.

When load becomes big, A mouth and f cavity pressure become big thereupon, promote reduction valve valve pocket 6 compression balance springs 14, channel size X between the h chamber of A mouth and reduction valve valve pocket 6 is reduced, fluid increases through the out-of-date pressure loss, thereby the pressure that enters h chamber and e chamber is descended, guarantee that the pressure before throttle valve spool 12 restrictions can not increase greatly because of load becomes, make the pressure difference of restriction front and back constant substantially, thereby guarantee that flow is constant, make the descending movement velocity of workpiece constant, vice versa.

When piston moves upward, fluid enters the b chamber by the T mouth, because this moment, pressure direction was consistent with the one-way valve opening direction, so one-way valve spool 15 is open under the effect of pressure, fluid is through the one-way valve valve port, aperture on the one-way valve spool 15, the center hole of press table 4 and aperture enter the c chamber, and reduction valve valve pocket 6 is pushed into the step place of bonnet 9 by the aperture on the top board 5, h chamber on the reduction valve valve pocket 6 communicates with the g chamber of bonnet, c chamber fluid enters the d chamber, and through the g chamber of throttle valve spool 12 center holes and bonnet, the h chamber of reduction valve valve pocket 6 and the A mouth of upper valve body flow out, as shown in Figure 4.

Claims

1, a kind of hydraulically balanced valve is characterized in that: it comprises valve body (3) and upper valve body (7) down, and following valve body (3) and upper valve body (7) fix as one; Be provided with bottom flange (1) in following valve body (3) lower end, be provided with bonnet (9) in upper valve body (7) upper end; In the cavity that valve body (3) and upper valve body (7) constitute down, push rod (16), one-way valve spool (15), check valve spring (13), balance spring (14), reduction valve valve pocket (6), Returnning spring (8) and throttle valve spool (12) are housed, the lower end of one-way valve spool (15) contacts with push rod (16), the following end in contact of upper end and check valve spring (13); The upper end of check valve spring (13) contacts with throttle valve spool (12); Balance spring (14) is arranged on down the connection part of valve body (3) and upper valve body (7), is provided with press table (4) at balance spring (14) downside, is provided with top board (5) at balance spring (14) upside; Reduction valve valve pocket (6) lower end is arranged on the top board (5), and the upper end contacts with Returnning spring (8); On throttle valve spool (12), be provided with throttle valve adjustment handle (10); On bottom flange (1), be provided with the K mouth,, on upper valve body (7), be provided with the A mouth being provided with the T mouth on the valve body (3) down.

2, hydraulically balanced valve according to claim 1 is characterized in that: circumferentially evenly be furnished with six circular holes in one-way valve spool (15), press table (4) and top board (5) upper edge.

3, hydraulically balanced valve according to claim 1 is characterized in that: be furnished with two orthogonal circular holes on the throttle valve spool (12), communicate with two end faces of spool respectively along the circular hole of valve core axis's direction; The circular hole vertical with the valve core axis direction communicates with the outer round surface of spool respectively.

4, hydraulically balanced valve according to claim 1 is characterized in that: in following valve body (3), a chamber of push rod (16) lower end communicates with the K mouth; The b chamber that push rod (16) is located communicates with the T mouth.