CN101949397A

CN101949397A - Balanced valve bank of derricking cylinder system

Info

Publication number: CN101949397A
Application number: CN 201010516705
Authority: CN
Inventors: 竺浩君
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-20
Filing date: 2010-10-20
Publication date: 2011-01-19

Abstract

The invention relates to a balanced valve bank of a derricking cylinder system. A casting runner, a working port A and a working port B are arranged on a balanced valve body; the balanced valve body is singly connected with one-way valves PF2 and DF1, the one-way valve DF1 is connected with a damper III to form a one-way throttling valve, a control end cover is provided with a control port Px and an unloading port L, the balanced valve body is also connected with a damper IV, an oil tube of the control port Px is connected with a filter screen damper and a damper II, an oil tube of the unloading port L is connected with a damper I; and the dampers I, II and IV as well as the filter screen damper are communicated and matched to form a liquid bridge type control manner. The one-way throttling valve structure effectively solves the problem of loosing of the derricking cylinder produced in China at present. The control end cover is controlled in a liquid bridge manner, which effectively eliminates the phenomenon of joggling of the cylinder because the openness of a balanced valve plug is influenced by pressure impaction. The casting runner reduces the pressure drop and decreases the heating value, therefore, the working efficiency is improved. A one-way valve thread inserting structure is singly inserted into the balanced valve body; and the valve bank can meet the requirements for micromotion, stability and safety in all working conditions.

Description

Amplitude oil cylinder system balancing valve group

Technical field

The present invention relates to a kind of equilibrium valve group, particularly a kind ofly be widely used in the amplitude oil cylinder system balancing valve group on all kinds of hydraulic mobile cranes in the engineering machinery.

Background technique

At present, all kinds of hydraulic mobile cranes are widely used in carrying out in bridge, the harbour construction assembling work in the engineering machinery, but the equilibrium valve that has the amplitude oil cylinder system of homemade and part imported auto hoist now can't satisfy the job requirement of fine motion and stationarity, and under the equilibrium valve closed condition, owing to system back pressure and the material deformation that heating causes cause realizing zero leakage, cause oil cylinder to sink, produce greatly potential safety hazard.

The patent No. 200920230848.8 " heavy load master cylinder equilibrium valve group " provides only is to satisfy big flow drilling hydraulic system to use, and accelerated motion out of control causes the equilibrium valve group of security incident when preventing the oil return of heavy load oil cylinder.

Summary of the invention

Technical problem to be solved by this invention is: a kind of amplitude oil cylinder system balancing valve group is provided, can realizes fine motion, stationarity and the Security of amplitude oil cylinder action, and can reach the requirement of energy-saving and emission-reduction.

The present invention addresses the above problem the technological scheme that is adopted: amplitude oil cylinder system balancing valve group, comprise and have the stifled control end cap of ball, one-way valve and balance valve body, balance valve core, the balance valve pocket, the equilibrium valve spring, on the described balance valve body casting runner is arranged, actuator port A is arranged, B, and be singly connected with one-way valve PF2, one-way valve DF1, be connected with the damping III on the described one-way valve DF1 and constitute one-way throttle valve, described control end covers and has control port Px, off-load hydraulic fluid port L, also be connected with the damping IV on the described balance valve body, be connected with filter screen damping and damping II on the oil pipe of described control port Px, connect damping I, described damping I on the oil pipe of off-load hydraulic fluid port L, II, IV, the filter screen damping communicates and mates and constitutes liquid bridge-type control mode.

Compared with prior art, the invention has the advantages that: 1, valve inner adopts two casting runner forms, has reduced pressure drop and reduction heating value that runner produces, has improved working efficiency; 2, the equilibrium valve group one-way valve of breaking the normal procedure is integrated in the structure of balance valve core inside, one-way valve adopts thread cartridge formula structure, be inserted into the balance valve inner separately, solve because balance valve core limitation structure causes one-way valve to form strong throttling, and a large amount of heatings, and but the flow area of one-way valve can have more and practical require and change, and makes that the use face of this valve is more extensive; 3, react on the strong pressure signal oil sources of balance valve core spring and take from the valve import, and adopt the one-way throttle valve arrangement, effectively solve the phenomenon that current homemade general amplitude oil cylinder sinks can't lock under the deadweight effect; 4, the control end cap adopts liquid bridge-type control mode, effectively eliminates the opening degree of the shock effect balance valve core of system works pressure, causes the oil cylinder jitter phenomenon; 5, this valve group oil outlet adopts flange to connect, and directly is connected with amplitude oil cylinder by flange, has reduced the system pipeline layout, prevents that effectively oil cylinder rodless cavity is owing to booster and the formation accident; 6, the balance valve core restriction mills into smooth flow curve, and good counterbalance effect is arranged under low flow rate condition, also satisfies the requirement that has all operating modes now and realize fine motion, stationarity and Security.

Description of drawings

Fig. 1, structural representation of the present invention (closed condition).

The left view of Fig. 2, Fig. 1.

The E-E amplification view of Fig. 3, Fig. 1.

Fig. 4, hydraulic schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing embodiments of the invention are further described.

On four jiaos of the end cap valve body 1 of control end cap 16 mounting hole is arranged, oil pipe ball stifled 5 is arranged on the adjacent two side, there is control port Px to be connected on the other two adjacent sidewalls with the rod chamber of amplitude oil cylinder, there is off-load hydraulic fluid port L to be connected with fuel tank, also at two oil pipe mouths of two hydraulic fluid ports with the damping I 2 that is threaded, damping II 4, middle at control port Px also with the filter screen damping 3 that is threaded, filter screen damping 3 is made up of tight embedding filter screen 3-2 in the groove of joint 3-1 upper-end surface, in the middle of the joint Hexagon blind hole of being convenient to install and use is arranged, as shown in Figure 3.

Control end cap 16 is screwed on an end face of balance valve body 13, and the damping IV 15 of two series connection on balance valve body one end face is aimed in the intersection that makes two oil pipes on it, and the damping size is complementary to make it communicate also with damping 1, damping 2, filter screen damping 3, the control end cap adopts liquid bridge-type control mode, effectively eliminate the opening degree of the shock effect balance valve core of system works pressure, cause the oil cylinder jitter phenomenon.

Connect one-way valve DF II 14 separately with screw thread on one sidewall of balance valve body 13 upper ends, check-valve port is connected with actuator port B, and the upper end relatively has on another sidewall actuator port A to communicate with two parallel casting runner a, b on the valve body.

Balance valve body 13 lower ends one side is with the balance valve pocket 11 that is threaded.

Balance valve core 12 and one-way valve DF1 9 are installed on the balance valve pocket 11, mounting spring seat 8 in an end of one-way valve, with the one-way throttle valve that constitutes by one-way valve DF1 9 and the two damping III 10 of connecting, at the end of the one-way valve DF1 end cap 6 that is threaded and has balance spring 7, as shown in Figure 1.

Actuator port A connects with the actuator port of the corresponding amplitude oil cylinder of selector valve, and actuator port B is connected with the rodless cavity of amplitude oil cylinder.

When the rodless cavity oil-feed of amplitude oil cylinder, the overhanging action of amplitude oil cylinder, system works fluid is opened one-way valve DF2 14 through actuator port A, enters the amplitude oil cylinder rodless cavity by actuator port B and realizes the overhanging work of oil cylinder; When the rod chamber oil-feed of amplitude oil cylinder, the action of amplitude oil cylinder retraction, this moment, balance valve core 12 was in closed condition under 7 effects of equilibrium valve spring, one-way valve DF2 14 also is in closed condition, cut off casting runner a and b, system works fluid enters rod chamber and promotes amplitude oil cylinder, the while build-up pressure, pressure signal oil is through control port Px, filter screen damping 3 and damping II 4 enter control end cap 16, part pressure oil returns the luffing fuel tank through damping I 2 by off-load hydraulic fluid port L, another part pressure oil overcomes the active force of equilibrium valve spring 7 through damping III 10, steadily, promoting balance valve core 12 moves right, make casting runner a and b conducting on the balance valve body, amplitude oil cylinder rodless cavity fluid is through actuator port B, balance valve core and actuator port A oil sump tank, finish the retraction action of amplitude oil cylinder, too big and influence the stationarity of car load in order to prevent that amplitude oil cylinder from opening and closing the impact of moment at retraction, fluid in end cap 6 chambeies at equilibrium valve spring 7 places is under the effect of one-way throttle valve, realize opening fast, slowly close balance valve core 12, effectively eliminate the compression shock that balance valve core opens and closes moment; The fluctuation of load in order to prevent that amplitude oil cylinder from causing owing to load angle difference in retraction process simultaneously, it is the fluctuation of rod chamber working pressure, when control pressure signal fluctuateed, off-load hydraulic fluid port L effectively absorbed the crest of control pressure signal, and pilot pressure is remained steadily; When amplitude oil cylinder is in a certain station, balance valve core 12 is closed under the 7 power effects of equilibrium valve spring, system produces back pressure in other actuator's working procedure, the back pressure of control port Px by off-load hydraulic fluid port L through no back pressure off-load runner oil sump tank, the back pressure of actuator port A enters end cap 6 chambeies of equilibrium valve spring through one-way valve DF1 and damping III 10, help equilibrium valve spring 7 to close balance valve core 12, prevent that more effectively system back pressure from causing balance valve core 12 to leak.

The present invention is widely used in the amplitude oil cylinder system of truck crane in the engineering machinery, and he effectively solves the not stationarity of small flow fine motion operating mode, and amplitude oil cylinder sinking etc. has the defective of potential safety hazard, also reaches the effect of national energy-saving and emission-reduction on this basis.

Claims

1. amplitude oil cylinder system balancing valve group, comprise the control end cap (16) that has ball stifled (5), one-way valve and balance valve body (13), balance valve core (12), balance valve pocket (11), equilibrium valve spring (7), it is characterized in that on the described balance valve body (13) the casting runner being arranged, actuator port (A is arranged, B), and be singly connected with one-way valve PF2 (14), one-way valve DF1 (9), be connected with damping III (10) on the described one-way valve DF1 (9) and constitute one-way throttle valve, have control port (Px) on the described control end cap (16), off-load hydraulic fluid port (L), also be connected with damping IV (15) on the described balance valve body, be connected with filter screen damping (3) and damping II (4) on the oil pipe of described control port (Px), connect damping I (2), described damping I (2) on the oil pipe of off-load hydraulic fluid port (L), II (4), IV (15), filter screen damping (3) communicates and mates and constitutes liquid bridge-type control mode.

2. amplitude oil cylinder system balancing valve group according to claim 1 is characterized in that having on the described balance valve body (13) two parallel casting runners (a, b).

3. amplitude oil cylinder system balancing valve group according to claim 1 is characterized in that described filter screen damping (3) is made up of tight embedding filter screen (3-2) in the groove of joint (3-1) upper-end surface, and there is hexagonal blind hole described joint centre.

4. amplitude oil cylinder system balancing valve group according to claim 1 is characterized in that described damping IV (15), damping III (10) are connected into by two dampings respectively.

5. amplitude oil cylinder system balancing valve group according to claim 1 is characterized in that described one-way valve (DF1, DF2) is inserted into balance valve body (13) inside separately with screw thread.