CN202381427U - Hydraulic oil cylinder synchronization control loop and crane using same - Google Patents

Hydraulic oil cylinder synchronization control loop and crane using same Download PDF

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Publication number
CN202381427U
CN202381427U CN2011205244199U CN201120524419U CN202381427U CN 202381427 U CN202381427 U CN 202381427U CN 2011205244199 U CN2011205244199 U CN 2011205244199U CN 201120524419 U CN201120524419 U CN 201120524419U CN 202381427 U CN202381427 U CN 202381427U
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CN
China
Prior art keywords
control valve
hydraulic jack
fluid port
hydraulic
hydraulic fluid
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CN2011205244199U
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Chinese (zh)
Inventor
史先信
王必旺
唐红彩
张晓磊
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徐州重型机械有限公司
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Priority to CN2011205244199U priority Critical patent/CN202381427U/en
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Publication of CN202381427U publication Critical patent/CN202381427U/en

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Abstract

The utility model discloses a hydraulic oil cylinder synchronization control loop comprising a first hydraulic oil cylinder and a second hydraulic oil cylinder which drive the same action member. Rod cavities and rodless cavities of the two hydraulic oil cylinders are connected in parallel and control the two oil cylinders to stretch through a direction control valve; meanwhile, a flow distributing and collecting valve is arranged between the two oil cylinders and the direction control valve, synchronous extending of the two oil cylinders can be realized through a flow distributing function of the flow distributing and collecting valve, and synchronous retraction of the two oil cylinders can be realized through a flow collecting function of the flow distributing and collecting valve. Synchronous direction control valves are arranged among the rod cavity of one oil cylinder, the direction control valve and the rodless cavity of the other oil cylinder, so that the rod cavity of the corresponding hydraulic oil cylinder and the rodless cavity of the other hydraulic oil cylinder are controlled to be communicated or conducted with the direction control valves through switching the synchronous direction control valves. Compared with the prior art, the hydraulic oil cylinder synchronization control loop has better synchronous control precision, and does not need to be frequently regulated in a control process so that the working efficiency of synchronous control is greatly increased. On the basis of the hydraulic oil cylinder synchronization control loop, the utility model also provides a crane using the hydraulic oil cylinder synchronization control loop.

Description

Hydraulic jack synchronizing control loop and use the hoist of this control loop
Technical field
The utility model relates to a kind of engineering machinery technology, is specifically related to a kind of hydraulic jack synchronizing control loop and uses the hoist of this control loop.
Background technique
Hydraulic synchronous system is a technical task eternal in the hydraulics application practice, to guarantee the operation precision of executable operations.At present, mobile crane is developed rapidly, only uses less than the time in 10 years and accomplishes the great-leap-forward development from hundred tonnes of product to kiloton products; The executive system of multiple employing biliquid compressing cylinder appears based on the variation of new architecture lifting performance, for example, but luffing auxiliary mechanism of crane super lifting mechanism and elevator latch ratchet mechanism etc.In addition, the counterweight of conventional hoist articulates and also adopts the biliquid compressing cylinder to accomplish operating from dismounting of counterweight.
Increase along with the lifting tonnage; The load of each executive system all can be in various degree increase, mechanism structure size and movement range all increase accordingly simultaneously, therefore; In the practical work process, nonsynchronous phenomenon very easily appears in two hydraulic jacks of each executive system.As everyone knows, asynchrony phenomenon directly influences mechanism action stability, influences the execution of entire mechanism, and comparatively serious words will cause the damage or the cut-out of two hydraulic jacks.
See also Fig. 1, a kind of synchronizing control loop schematic diagram of typical biliquid compressing cylinder in this figure existing technology.
For effectively improving the net synchronization capability of two hydraulic jacks, this control loop has carried out optimal design on the basis of conventional synchronization control technique.In this scheme, pressure oil liquid realizes that through the shunting function of flow divider-combiner oil cylinder is overhanging synchronously, realizes that through the afflux function oil cylinder bounces back synchronously; Simultaneously, between flow divider-combiner to two hydraulic jack, be respectively arranged with a switch valve.After synchronism deviation appearred in executive system, the operator is the master cock valve according to actual needs, regulated the active chamber and the oil return circuit conducting of corresponding hydraulic jack, to regulate the synchronism of two hydraulic jacks of control through fine motion.Yet the working state of the continuous switching valve of this scheme practical operation is regulated, and operation is inconvenience comparatively, has the low excessively defective of working efficiency.
In view of this, demanding urgently looking for another way provides a kind of hydraulic jack synchronizing control loop, on the basis of guaranteeing biliquid compressing cylinder synchronism, effectively improves operating efficiency.
The model utility content
To above-mentioned defective, the technical problem that the utility model solves is, a kind of hydraulic jack synchronizing control loop is provided, and effectively improves operating efficiency with the control loop through optimal design.On this basis, the utility model also provides the hoist of this hydraulic jack synchronizing control loop of a kind of application.
A kind of hydraulic jack synchronizing control loop that the utility model provides comprises first hydraulic jack and second hydraulic jack, the position control valve of controlling first and second hydraulic jack expanding-contracting action, flow divider-combiner, the first sync direction control valve and the second sync direction control valve that drive same actuating member; Wherein, the rod chamber of said first and second hydraulic jack and rodless cavity parallel connection; Said position control valve is arranged between first and second hydraulic jack and system pressure oil circuit and the oil return circuit; Said flow divider-combiner is arranged between first and second hydraulic jack and the said position control valve; Two shunting hydraulic fluid ports of said flow divider-combiner link to each other with the rodless cavity of first and second hydraulic jack respectively; The interflow hydraulic fluid port of said flow divider-combiner links to each other with position control valve; The said first sync direction control valve is arranged between the rodless cavity of rod chamber and the said position control valve and second hydraulic jack of first hydraulic jack, the rod chamber of said first hydraulic jack of the switching controls of the said first sync direction control valve and the rodless cavity conducting of said second hydraulic jack or with said position control valve conducting; The said second sync direction control valve is arranged between the rodless cavity of rod chamber and the said position control valve and first hydraulic jack of second hydraulic jack, the rod chamber of said second hydraulic jack of the switching controls of the said second sync direction control valve and the rodless cavity conducting of said first hydraulic jack or with said position control valve conducting.
Preferably; First and second sync direction control valve is the two-position three way solenoid directional control valve, and first hydraulic fluid port of said two-position three way solenoid directional control valve is communicated with the rod chamber of corresponding hydraulic jack, second hydraulic fluid port is communicated with the rodless cavity of another hydraulic jack, the 3rd hydraulic fluid port is communicated with said position control valve; And said two-position three way solenoid directional control valve is configured to: be positioned at first working position under the normality, its first hydraulic fluid port and the second hydraulic fluid port conducting, the 3rd hydraulic fluid port are non-conduction; Be positioned at second working position after electric, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port are non-conduction.
Preferably, second hydraulic fluid port of each said two-position three way solenoid directional control valve connection oil circuit is provided with the throttling damping.
Preferably, be provided with equilibrium valve on the rodless cavity of first and second hydraulic jack connection oil circuit, the control port of said equilibrium valve all is communicated with the rod chamber of corresponding hydraulic jack.
Preferably, be provided with relief valve on the rod chamber of first and second hydraulic jack connection oil circuit.
Preferably; Said position control valve is a three position four-way directional control valve, and its first hydraulic fluid port is communicated with the interflow hydraulic fluid port of said flow divider-combiner, second hydraulic fluid port is communicated with the first sync direction control valve and the second sync direction control valve, the 3rd hydraulic fluid port is communicated with the system pressure oil circuit, the 4th hydraulic fluid port is communicated with the system oil return oil circuit; And said three position four-way directional control valve is configured to: be positioned at first working position, its 3rd hydraulic fluid port is communicated with first hydraulic fluid port, the 4th hydraulic fluid port is communicated with second hydraulic fluid port; Be positioned at second working position, its 3rd hydraulic fluid port is communicated with second hydraulic fluid port, the 4th hydraulic fluid port is communicated with first hydraulic fluid port; Be positioned at the 3rd working position, its 3rd hydraulic fluid port is non-conduction, the 4th hydraulic fluid port and first hydraulic fluid port and the second hydraulic fluid port conducting.
The another kind of hydraulic jack synchronizing control loop that the utility model provides comprises first hydraulic jack and second hydraulic jack, the position control valve of controlling first and second hydraulic jack expanding-contracting action, flow divider-combiner, the first sync direction control valve and the second sync direction control valve that drive same actuating member; Wherein, the rodless cavity of said first and second hydraulic jack and rod chamber parallel connection; Said position control valve is arranged between first and second hydraulic jack and system pressure oil circuit and the oil return circuit; Said flow divider-combiner is arranged between first and second hydraulic jack and the said position control valve; Two shunting hydraulic fluid ports of said flow divider-combiner link to each other with the rod chamber of first and second hydraulic jack respectively; The interflow hydraulic fluid port of said flow divider-combiner links to each other with the first direction control valve; The said first sync direction control valve is arranged between the rod chamber of rodless cavity and the said position control valve and second hydraulic jack of first hydraulic jack, the rodless cavity of said first hydraulic jack of the switching controls of the said first sync direction control valve and the rod chamber conducting of said second hydraulic jack or with said position control valve conducting; The said second sync direction control valve is arranged between the rod chamber of rodless cavity and the said position control valve and first hydraulic jack of second hydraulic jack, the rodless cavity of said second hydraulic jack of the switching controls of the said second sync direction control valve and the rod chamber conducting of said first hydraulic jack or with said position control valve conducting.
Preferably; First and second sync direction control valve is the two-position three way solenoid directional control valve, and first hydraulic fluid port of said two-position three way solenoid directional control valve is communicated with the rodless cavity of corresponding hydraulic jack, second hydraulic fluid port is communicated with the rod chamber of another hydraulic jack, the 3rd hydraulic fluid port is communicated with said position control valve; And said two-position three way solenoid directional control valve is configured to: be positioned at first working position under the normality, its first hydraulic fluid port and the second hydraulic fluid port conducting, the 3rd hydraulic fluid port are non-conduction; Be positioned at second working position after electric, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port are non-conduction.
Preferably, second hydraulic fluid port of each said two-position three way solenoid directional control valve connection oil circuit is provided with the throttling damping.
The hoist that the utility model provides comprises the actuating member and the hydraulic jack synchronizing control loop that are driven by two hydraulic jacks, and said hydraulic jack synchronizing control loop is specially foregoing hydraulic jack synchronizing control loop.
In the hydraulic jack synchronizing control loop that the utility model provides, the rod chamber of two hydraulic jacks, rodless cavity be parallel connection all, and the stretching out or regain of two hydraulic jacks of direction of passage control valve control; Simultaneously, between two hydraulic jacks and position control valve, be provided with flow divider-combiner, realize that with shunting function oil cylinder is overhanging synchronously, realize that through the afflux function oil cylinder bounces back synchronously through flow divider-combiner.In addition; Be provided with the sync direction control valve between the rodless cavity of the rod chamber of each oil cylinder and position control valve and another oil cylinder, be communicated with the rodless cavity of another hydraulic jack perhaps and the position control valve conducting with the rod chamber of the corresponding hydraulic jack of switching controls through the sync direction control valve.In the working procedure, position control valve switches to the working position that oil cylinder stretches out, and promptly pressure oil liquid is communicated with the rodless cavity of two hydraulic jacks through direction control valve and flow divider-combiner, promotes piston displacement and realizes that oil cylinder stretches out operation; Simultaneously, the rod chamber of the first sync direction control valve and the corresponding hydraulic jack of the second sync direction control valve may command is communicated with the rodless cavity of another hydraulic jack, and like this, the motion of stretching out of two hydraulic jacks conditions each other, produces the flow complementation; Simultaneously, rod chamber, the rodless cavity of two hydraulic jacks communicate, and both pressure equates, thereby it is complementary to form pressure, and it is thrust difference and taking place that the synchronous rising of two cylinders utilizes total pressure difference.The synchronism of two hydraulic jack retractions is to rely on the afflux function of flow divider-combiner to satisfy.Compared with prior art, the control loop that the utility model provides has synchronous control accuracy preferably, and does not need frequent adjusting in the control procedure, has improved the working efficiency of synchronization control greatly.
In the preferred version of the utility model; First and second sync direction control valve is the two-position three way solenoid directional control valve; And second hydraulic fluid port that is communicated with rodless cavity another hydraulic jack each two-position three way solenoid directional control valve is provided with damping; So be provided with, can for further improving synchronous control accuracy reliable guarantee be provided through the complementary impact effect of damping adjustment flow of the different latus rectum sizes of coupling.
In another preferred version of the utility model, the rod chamber of first and second hydraulic jack is communicated with on the oil circuit and is provided with relief valve, avoiding the overpressure of cylinder rod chamber, thereby makes hydraulic jack under safety pressure, work.
The hydraulic jack synchronizing control loop that the utility model provides is applicable to the hoist that adopts the biliquid compressing cylinder to drive same actuating member, is specially adapted to mobile crane.
Description of drawings
Fig. 1 is the schematic diagram of a kind of typical biliquid compressing cylinder synchronizing control loop in the existing technology;
Fig. 2 is the overall structure schematic representation of the said hoist of embodiment;
Fig. 3 is the schematic diagram of the described executive component synchronizing control loop of embodiment.
Among Fig. 2-Fig. 3:
First hydraulic jack 11, second hydraulic jack 12, position control valve 13, flow divider-combiner 14, the first sync direction control valve 15, the second sync direction control valve 16, throttling damping 17, first equilibrium valve 18, second equilibrium valve 19, relief valve 20.
Embodiment
The core of the utility model is to provide a kind of hydraulic jack synchronizing control loop, adopts the two on the basis of guaranteeing two executive component synchronisms of this control loop control, effectively improves operating efficiency.Specify this mode of execution below in conjunction with Figure of description.
Be without loss of generality, this mode of execution specifies as main body with wheeled crane.
See also Fig. 2, this figure is the overall structure schematic representation of the said wheeled crane of this mode of execution.
As shown in the figure; This hoist comprises wheel undercarriage, be arranged on the turntable of getting on the bus on the wheel undercarriage, be articulated in the anterior Lifting device of turntable of getting on the bus, the winding plant of weight up-down driving force is provided, and the main function components such as counter weight device that are positioned at the turntable rear portion of getting on the bus.
Need to prove that the said aforementioned functional parts of this mode of execution can adopt existing techniques in realizing, for example, counter weight device adopts two hydraulic jacks to drive balance weight irons and realizes that it is from the dismounting operation etc.So this paper specifically repeating no more for building blocks of functions such as chassis, the turntable of getting on the bus, Lifting devices.Be to specify the application's inventive point, please further referring to the schematic diagram of executive component synchronizing control loop shown in Figure 2, this control loop can be used for controlling the crane counterweight device from the dismounting operation, also can be used for the attitude that overcharge puts and adjust.
This synchronizing control loop comprises the rod chamber and the rodless cavity parallel connection respectively of first hydraulic jack 11 and 12, two hydraulic jacks of second hydraulic jack, with the identical moving link of driven in common; And the expanding-contracting action of direction of passage control valve 13 control first hydraulic jacks 11 and second hydraulic jack 12.As shown in the figure, position control valve 13 is arranged between two hydraulic jacks and system pressure oil circuit P and the oil return circuit T, and the switching of direction of passage control valve 13 working positions can realize that pressure oil liquid is communicated with the rodless cavity or the rod chamber of two hydraulic jacks.
Wherein, Flow divider-combiner 14 is arranged between first hydraulic jack 11 and second hydraulic jack 12 and the position control valve 13; As shown in the figure, two shunting hydraulic fluid port C1, C2 of flow divider-combiner 14 link to each other with the rodless cavity of first hydraulic jack 11 and second hydraulic jack 12 respectively, and the interflow hydraulic fluid port V of flow divider-combiner 14 links to each other with position control valve 13; Realize that with shunting function oil cylinder is overhanging synchronously, realize that through the afflux function oil cylinder bounces back synchronously through flow divider-combiner.
Wherein, Be provided with the sync direction control valve between the rodless cavity of the rod chamber of each hydraulic jack and position control valve and another oil cylinder, be communicated with the rodless cavity of another hydraulic jack perhaps and the position control valve conducting with the rod chamber of the corresponding hydraulic jack of switching controls through the sync direction control valve.As shown in the figure; The first sync direction control valve 15 is arranged between the rodless cavity of rod chamber and the position control valve 13 and second hydraulic jack 12 of first hydraulic jack 11, the rod chamber of switching controls first hydraulic jack 11 of the first sync direction control valve 15 and the rodless cavity conducting of second hydraulic jack 12 or with position control valve 13 conductings; The second sync direction control valve 16 is arranged between the rodless cavity of rod chamber and the position control valve 13 and first hydraulic jack 11 of second hydraulic jack 12, the rod chamber of switching controls second hydraulic jack 12 of the second sync direction control valve 16 and the rodless cavity conducting of first hydraulic jack 11 or with position control valve 13 conductings.
Should be appreciated that the first sync direction control valve 15 and the second sync direction control valve 16 have three hydraulic fluid ports and can satisfy the demand in two working positions, specifically can adopt hand control valve also can adopt solenoid directional control valve based on the requirement of direction control.As shown in the figure, the first sync direction control valve 15 and the second sync direction control valve 16 are the two-position three way solenoid directional control valve.Particularly, first hydraulic fluid port of the first sync direction control valve 15 is communicated with the rod chamber of first hydraulic jack 11, second hydraulic fluid port is communicated with the rodless cavity of second hydraulic jack 12, the 3rd hydraulic fluid port is communicated with position control valve 13; First hydraulic fluid port of the second sync direction control valve 16 is communicated with the rod chamber of second hydraulic jack 12, second hydraulic fluid port is communicated with the rodless cavity of first hydraulic jack 11, the 3rd hydraulic fluid port is communicated with position control valve 13; And two two-position three way solenoid directional control valves all are configured to: be positioned at first working position under the normality, its first hydraulic fluid port and the second hydraulic fluid port conducting, the 3rd hydraulic fluid port are non-conduction; Be positioned at second working position after electric, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port are non-conduction.
In order further to improve the adaptability of this control loop; As shown in Figure 3, can be according to actual needs be communicated with oil circuit and be provided with throttling damping 17, to adjust the work damping of corresponding solenoid directional control valve at second hydraulic fluid port of each said two-position three way solenoid directional control valve; Promptly through the big or small damping of the different latus rectums of coupling; Can adjust the complementary impact effect of flow, the fine setting effect of synchronizing control loop just changes, and for further improving synchronous control accuracy reliable guarantee is provided.
Simultaneously, on the rodless cavity connection oil circuit of first hydraulic jack 11, be provided with first equilibrium valve 18, the control port of this first equilibrium valve 18 is communicated with the rod chamber of first hydraulic jack 11; The rodless cavity of second hydraulic jack 12 is communicated with oil circuit and is provided with second equilibrium valve 19, and the control port of this second equilibrium valve 19 all is communicated with the rod chamber of second hydraulic jack 12.So be provided with, can further improve the stability that hydraulic jack is regained operation.In addition, be communicated with on the oil circuit at the rod chamber of first hydraulic jack 11 and second hydraulic jack 12 and be provided with relief valve 20, avoiding the overpressure of cylinder rod chamber, thereby make hydraulic jack under safety pressure, work.
Need to prove equally, be used to control that two hydraulic jacks stretch out or the position control valve regained specifically can adopt hand control valve also can adopt solenoid directional control valve.As shown in the figure; Position control valve 13 is a three position four-way directional control valve, and its first hydraulic fluid port is communicated with the interflow hydraulic fluid port of flow divider-combiner 14, second hydraulic fluid port is communicated with the first sync direction control valve 15 and the second sync direction control valve 16, the 3rd hydraulic fluid port is communicated with system pressure oil circuit P, the 4th hydraulic fluid port is communicated with system oil return oil circuit T; And this three position four-way directional control valve is configured to: Y21 gets current potential in first working position, and its 3rd hydraulic fluid port is communicated with first hydraulic fluid port, the 4th hydraulic fluid port is communicated with second hydraulic fluid port, and promptly diagram is right, and oil cylinder stretches out under this state; Y22 gets current potential in second working position, and its 3rd hydraulic fluid port is communicated with second hydraulic fluid port, the 4th hydraulic fluid port is communicated with first hydraulic fluid port, and promptly diagram is left, and oil cylinder is regained under this state; Be positioned at the 3rd working position, its 3rd hydraulic fluid port is non-conduction, the 4th hydraulic fluid port and first hydraulic fluid port and the second hydraulic fluid port conducting, promptly illustrates meta, and oil cylinder stops to stretch under this state.
The working procedure of this hydraulic jack synchronizing control loop of following brief description.
One, stretches out synchronously
The Y21 of position control valve 13 gets electric, is in right position.In conjunction with the relation of the control logic between the Y42 of the Y41 of the first sync direction control valve 15 and the second sync direction control valve 16, can obtain the synchronized relation shown in the following table.
1.1 the action matching relationship in conjunction with going up 1 operating mode of table the can be known; Y41 and Y42 are simultaneously; Under this state; Pressure oil liquid gets into the rodless cavity of first hydraulic jack 11 and second hydraulic jack 12 respectively through flow divider-combiner 14, and the fluid of two cylinder rod chambers flows back to oil return circuit through the corresponding synchronous position control valve respectively.
1.2 the action matching relationship in conjunction with going up 2,3 operating modes of table the can be known; When a hydraulic jack stretches out slowly therein; Through one getting electricly among control Y41 or the Y42 wherein, can control this and stretch out slower hydraulic jack and stretch out fast, to keep the synchronism of both actions through fine setting.Compared with prior art, above-mentioned synchronization control process has higher operating efficiency.
1.3 the action matching relationship in conjunction with going up 4 operating modes of table the can know, control Y41 and Y42 are simultaneously.Like this; One rod chamber pressure oil liquid exports another person's rodless cavity in two hydraulic jacks, makes the rod chamber of two hydraulic jacks, rodless cavity communicate, and both pressure equates; Thereby it is complementary to form pressure; It is thrust difference and taking place that the stretching out synchronously of two cylinders utilized total pressure difference, and capacity usage ratio improves, and the operating speed of two hydraulic jacks improves; And do not need frequent adjusting in the control procedure, improved the working efficiency of synchronization control greatly.
The control principle of concrete synchronous control accuracy is following.
At first, the split ratio of establishing diverter valve is ε, and the area ratio of hydraulic jack does The flow of hydraulic oil source is Q, and the flow that gets into the first hydraulic jack rodless cavity is Q 1, the flow that gets into the second hydraulic jack rodless cavity is Q 2
Then the flow of diverter valve both sides is respectively:
ϵ 1 + ϵ Q 1 1 + ϵ Q
Then the oil return flow of first hydraulic jack 11, second hydraulic jack, 12 rod chambers is respectively:
Q 1 - ϵ 1 + ϵ Q
Then the flow according to second hydraulic jack, 12 rodless cavities is:
The flow that then gets into second hydraulic jack, 12 rodless cavities is:
then synchronization error is:
And the streaming error that only uses flow divider-combiner to carry out equivalent is:
ξ = | Q 1 - Q 2 Q / 2 | × 100 % = | 2 ( Q 1 - Q 2 ) Q 1 + Q 2 | × 100 % = | 2 ( 1 - ϵ ) 1 + ϵ | × 100 %
Obviously; The synchronization accuracy of flow distributing and collecting valve control system can be improved in this loop, and it is that synchronization error reduces coefficient
Two, regain synchronously
The Y22 of position control valve 13 gets electric, is in position, a left side; The Y42 of the Y41 of the first sync direction control valve 15 and the second sync direction control valve 16 gets electric, is in right position.Under this state, pressure oil liquid gets into the rod chamber of first hydraulic jack 11 and second hydraulic jack 12, relies on the afflux function of flow divider-combiner 14 to realize the synchronism that two cylinders bounce back.
In addition; Flow divider-combiner 14 is arranged between first hydraulic jack, 11 rodless cavities, second hydraulic jack, 12 rodless cavities and the position control valve 13 in the foregoing description; And the first sync direction control valve 15 is arranged between the rodless cavity of rod chamber and the position control valve 13 and second hydraulic jack 12 of first hydraulic jack 11, and the second sync direction control valve 16 is arranged between the rodless cavity of rod chamber and the position control valve 13 and first hydraulic jack 11 of second hydraulic jack 12.Obviously, based on the inventive concept of the utility model, also can between the rodless cavity of corresponding oil cylinder and rod chamber, flow divider-combiner 14, the first sync direction control valve 15 and the second sync direction control valve 16 be set oppositely.
(not shown) specifically; Flow divider-combiner 14 can be arranged between first hydraulic jack, 11 rod chambers, second hydraulic jack, 12 rod chambers and the position control valve 13; Correspondingly; The first sync direction control valve 15 is arranged between the rod chamber of rodless cavity and the position control valve 13 and second hydraulic jack 12 of first hydraulic jack 11, the rodless cavity of switching controls first hydraulic jack 11 of the first sync direction control valve 15 and the rod chamber conducting of second hydraulic jack 12 or with position control valve 13 conductings; The second sync direction control valve 16 is arranged between the rod chamber of rodless cavity and the position control valve 13 and first hydraulic jack 11 of second hydraulic jack 12, the rodless cavity of switching controls second hydraulic jack 12 of the second sync direction control valve 16 and the rod chamber conducting of first hydraulic jack 11 or with position control valve 13 conductings.
Other formations of above-mentioned replacement scheme and annexation are identical with hydraulic jack synchronizing control loop shown in Figure 3, and concrete working procedure repeats no more.
The above only is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.

Claims (10)

1. hydraulic jack synchronizing control loop comprises:
Drive first hydraulic jack and second hydraulic jack of same actuating member, the rod chamber of said first and second hydraulic jack and rodless cavity parallel connection;
Control the position control valve of first and second hydraulic jack expanding-contracting action, be arranged between first and second hydraulic jack and system pressure oil circuit and the oil return circuit;
Flow divider-combiner; Be arranged between first and second hydraulic jack and the said position control valve, two shunting hydraulic fluid ports of said flow divider-combiner link to each other with the rodless cavity of first and second hydraulic jack respectively, and the interflow hydraulic fluid port of said flow divider-combiner links to each other with position control valve; It is characterized in that, also comprise:
The first sync direction control valve; Be arranged between the rodless cavity of rod chamber and the said position control valve and second hydraulic jack of first hydraulic jack, the rod chamber of said first hydraulic jack of the switching controls of the said first sync direction control valve and the rodless cavity conducting of said second hydraulic jack or with said position control valve conducting;
The second sync direction control valve; Be arranged between the rodless cavity of rod chamber and the said position control valve and first hydraulic jack of second hydraulic jack, the rod chamber of said second hydraulic jack of the switching controls of the said second sync direction control valve and the rodless cavity conducting of said first hydraulic jack or with said position control valve conducting.
2. hydraulic jack synchronizing control loop according to claim 1; It is characterized in that; First and second sync direction control valve is the two-position three way solenoid directional control valve, and first hydraulic fluid port of said two-position three way solenoid directional control valve is communicated with the rod chamber of corresponding hydraulic jack, second hydraulic fluid port is communicated with the rodless cavity of another hydraulic jack, the 3rd hydraulic fluid port is communicated with said position control valve; And said two-position three way solenoid directional control valve is configured to: be positioned at first working position under the normality, its first hydraulic fluid port and the second hydraulic fluid port conducting, the 3rd hydraulic fluid port are non-conduction; Be positioned at second working position after electric, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port are non-conduction.
3. hydraulic jack synchronizing control loop according to claim 2 is characterized in that, second hydraulic fluid port of each said two-position three way solenoid directional control valve is communicated with oil circuit and is provided with the throttling damping.
4. according to each described hydraulic jack synchronizing control loop in the claim 1 to 3; It is characterized in that; Be provided with equilibrium valve on the rodless cavity connection oil circuit of first and second hydraulic jack, the control port of said equilibrium valve all is communicated with the rod chamber of corresponding hydraulic jack.
5. hydraulic jack synchronizing control loop according to claim 4 is characterized in that, is provided with relief valve on the rod chamber connection oil circuit of first and second hydraulic jack.
6. hydraulic jack synchronizing control loop according to claim 5; It is characterized in that; Said position control valve is a three position four-way directional control valve, and its first hydraulic fluid port is communicated with the interflow hydraulic fluid port of said flow divider-combiner, second hydraulic fluid port is communicated with the first sync direction control valve and the second sync direction control valve, the 3rd hydraulic fluid port is communicated with the system pressure oil circuit, the 4th hydraulic fluid port is communicated with the system oil return oil circuit; And said three position four-way directional control valve is configured to: be positioned at first working position, its 3rd hydraulic fluid port is communicated with first hydraulic fluid port, the 4th hydraulic fluid port is communicated with second hydraulic fluid port; Be positioned at second working position, its 3rd hydraulic fluid port is communicated with second hydraulic fluid port, the 4th hydraulic fluid port is communicated with first hydraulic fluid port; Be positioned at the 3rd working position, its 3rd hydraulic fluid port is non-conduction, the 4th hydraulic fluid port and first hydraulic fluid port and the second hydraulic fluid port conducting.
7. hydraulic jack synchronizing control loop comprises:
Drive first hydraulic jack and second hydraulic jack of same actuating member, the rod chamber of said first and second hydraulic jack and rodless cavity parallel connection;
Control the position control valve of first and second hydraulic jack expanding-contracting action, be arranged between first and second hydraulic jack and system pressure oil circuit and the oil return circuit;
Flow divider-combiner; Be arranged between first and second hydraulic jack and the said position control valve; Two shunting hydraulic fluid ports of said flow divider-combiner link to each other with the rod chamber of first and second hydraulic jack respectively; The interflow hydraulic fluid port of said flow divider-combiner links to each other with the first direction control valve, it is characterized in that, also comprises:
The first sync direction control valve; Be arranged between the rod chamber of rodless cavity and the said position control valve and second hydraulic jack of first hydraulic jack, the rodless cavity of said first hydraulic jack of the switching controls of the said first sync direction control valve and the rod chamber conducting of said second hydraulic jack or with said position control valve conducting;
The second sync direction control valve; Be arranged between the rod chamber of rodless cavity and the said position control valve and first hydraulic jack of second hydraulic jack, the rodless cavity of said second hydraulic jack of the switching controls of the said second sync direction control valve and the rod chamber conducting of said first hydraulic jack or with said position control valve conducting.
8. hydraulic jack synchronizing control loop according to claim 7; It is characterized in that; First and second sync direction control valve is the two-position three way solenoid directional control valve, and first hydraulic fluid port of said two-position three way solenoid directional control valve is communicated with the rodless cavity of corresponding hydraulic jack, second hydraulic fluid port is communicated with the rod chamber of another hydraulic jack, the 3rd hydraulic fluid port is communicated with said position control valve; And said two-position three way solenoid directional control valve is configured to: be positioned at first working position under the normality, its first hydraulic fluid port and the second hydraulic fluid port conducting, the 3rd hydraulic fluid port are non-conduction; Be positioned at second working position after electric, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port are non-conduction.
9. hydraulic jack synchronizing control loop according to claim 8 is characterized in that, second hydraulic fluid port of each said two-position three way solenoid directional control valve is communicated with oil circuit and is provided with the throttling damping.
10. hoist comprises the actuating member and the hydraulic jack synchronizing control loop that are driven by two hydraulic jacks, it is characterized in that, said hydraulic jack synchronizing control loop is specially in the claim 1 to 9 that each is said.
CN2011205244199U 2011-12-14 2011-12-14 Hydraulic oil cylinder synchronization control loop and crane using same CN202381427U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102434512A (en) * 2011-12-14 2012-05-02 徐州重型机械有限公司 Hydraulic cylinder synchronization control loop and crane with same
CN103398039A (en) * 2013-08-22 2013-11-20 徐州重型机械有限公司 Control valve device, multi-cylinder synchronous control hydraulic system and crane
CN103470560A (en) * 2013-09-25 2013-12-25 徐州重型机械有限公司 Crane and power hydraulic system thereof
CN103644155A (en) * 2013-12-17 2014-03-19 上海电气电站设备有限公司 Hydraulic actuator
CN103671334A (en) * 2013-12-12 2014-03-26 中联重科股份有限公司 Hydraulic control system for synchronous rising and falling of oil-gas suspension oil cylinders and engineering vehicle
CN105967067A (en) * 2016-07-26 2016-09-28 三汽车起重机械有限公司 System for adjusting synchronous motion of oil cylinders, synchronous motion device and crane
CN109879184A (en) * 2019-03-06 2019-06-14 三一汽车起重机械有限公司 Counterweight synchronization hydraulic system and crane

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102434512A (en) * 2011-12-14 2012-05-02 徐州重型机械有限公司 Hydraulic cylinder synchronization control loop and crane with same
CN103398039A (en) * 2013-08-22 2013-11-20 徐州重型机械有限公司 Control valve device, multi-cylinder synchronous control hydraulic system and crane
CN103398039B (en) * 2013-08-22 2015-10-28 徐州重型机械有限公司 A kind of control valve device, multi-cylinder synchronous hydraulic control system and hoist
CN103470560A (en) * 2013-09-25 2013-12-25 徐州重型机械有限公司 Crane and power hydraulic system thereof
CN103671334A (en) * 2013-12-12 2014-03-26 中联重科股份有限公司 Hydraulic control system for synchronous rising and falling of oil-gas suspension oil cylinders and engineering vehicle
CN103671334B (en) * 2013-12-12 2016-01-27 中联重科股份有限公司 A kind of hydraulic control system of oleo-pneumatic suspension oil cylinder synchronization lifting and engineering vehicle
CN103644155A (en) * 2013-12-17 2014-03-19 上海电气电站设备有限公司 Hydraulic actuator
CN103644155B (en) * 2013-12-17 2016-01-13 上海电气电站设备有限公司 A kind of hydraulic actuator
CN105967067A (en) * 2016-07-26 2016-09-28 三汽车起重机械有限公司 System for adjusting synchronous motion of oil cylinders, synchronous motion device and crane
CN109879184A (en) * 2019-03-06 2019-06-14 三一汽车起重机械有限公司 Counterweight synchronization hydraulic system and crane

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