CN103771286B - Multi-cylinder synchronous lifting mechanism - Google Patents
Multi-cylinder synchronous lifting mechanism Download PDFInfo
- Publication number
- CN103771286B CN103771286B CN201410060582.2A CN201410060582A CN103771286B CN 103771286 B CN103771286 B CN 103771286B CN 201410060582 A CN201410060582 A CN 201410060582A CN 103771286 B CN103771286 B CN 103771286B
- Authority
- CN
- China
- Prior art keywords
- cylinder
- pipeline
- oil
- piston
- way valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of multi-cylinder synchronous lifting mechanism, comprising: left lifting cylinder, right lifting cylinder, loader, the first solenoid directional control valve, fuel tank, the second solenoid directional control valve, shuttle valve, the first hydraulic control one-way valve, the second hydraulic control one-way valve, the 3rd hydraulic control one-way valve, the 4th hydraulic control one-way valve, driving oil cylinder and some pipelines.For undersized weight, lifting can be realized by single hydraulic ram, if the size of weight is larger, usually be carried out the lifting of weight by multiple hydraulic ram.For the lifting mechanism of multiple hydraulic ram, what need to solve is the synchronous lifting of multiple hydraulic ram, if in weight lifting process, the lifting speed of each hydraulic ram and position can not realize synchronously, corresponding to weight, each supporting point position that hydraulic ram is formed produces deviation, easily causes the rollover of weight.Multi-cylinder synchronous lifting mechanism provided by the invention, structure is simple, reliable operation, fully can ensure the steady lifting of the multi-cylinder synchronous of large scale weight and decline.
Description
Technical field
The present invention relates to a kind of multi-cylinder synchronous lifting mechanism, be specifically related to the weight synchronous lifting mechanism realized by multiple hydraulic ram, belong to electric and field of electromechanical technology.
Background technology
At present, a lot of occasion widespread use hydraulic ram realize the lifting of weight, for undersized weight, lifting can be realized by single hydraulic ram, if the size of weight is larger, realize lifting only by single hydraulic ram, be very easy to the rollover causing weight, so, the lifting of large scale weight is usually carried out by multiple hydraulic ram.For the lifting mechanism of multiple hydraulic ram, the subject matter that needs solve is the synchronous lifting of multiple hydraulic ram, if in weight lifting process, the lifting speed of each hydraulic ram and position can not realize synchronously, corresponding to weight, each supporting point position that hydraulic ram is formed produces deviation, easily causes the rollover of weight.
For the lifting of large scale weight, the present invention is simple desirable to provide a kind of structure, the multi-cylinder synchronous lifting mechanism of reliable operation, realizes the steady lifting of large scale weight.
Summary of the invention
In order to ensure the steady lifting of large scale weight, the invention provides that a kind of structure is simple, the multi-cylinder synchronous lifting mechanism of reliable operation, technical scheme of the present invention is as follows:
Multi-cylinder synchronous lifting mechanism, comprise: left lifting cylinder, right lifting cylinder, loader, the first solenoid directional control valve, fuel tank, the second solenoid directional control valve, shuttle valve, the first hydraulic control one-way valve, the second hydraulic control one-way valve, the 3rd hydraulic control one-way valve, the 4th hydraulic control one-way valve, driving oil cylinder and some pipelines, pipeline comprises pipeline one, pipeline two, pipeline three, pipeline four, pipeline five, pipeline six, pipeline seven, pipeline eight, pipeline nine, pipeline ten, pipeline 11, pipeline 12, pipeline 13, pipeline 14, pipeline 15.
Left lifting cylinder and right lifting cylinder be placed in respectively mechanism lift left and right sides below weight.Described left lifting cylinder comprises left cylinder epicoele, left cylinder piston rod, left cylinder piston, left cylinder cavity of resorption, left cylinder cylinder barrel, left cylinder exhaust gear, left side below left cylinder piston rod and weight offsets, left cylinder epicoele is connected with air by the left cylinder exhaust gear be arranged on left cylinder cylinder barrel, if left cylinder cavity of resorption passes into high pressure oil, act on the lower end of left cylinder piston, the gravity that left cylinder piston and left cylinder piston rod overcome weight can be promoted, realize the left side upwards lifting of weight; Described right lifting cylinder comprises right cylinder epicoele, right cylinder piston rod, right cylinder piston, right cylinder cavity of resorption, right cylinder cylinder barrel, right cylinder exhaust gear, right side below right cylinder piston rod and weight offsets, right cylinder epicoele is connected with air by the right cylinder exhaust gear be arranged on right cylinder cylinder barrel, if right cylinder cavity of resorption passes into high pressure oil, act on the lower end of right cylinder piston, the gravity that right cylinder piston and right cylinder piston rod overcome weight can be promoted, realize the right side upwards lifting of weight.If left cylinder cavity of resorption and right cylinder cavity of resorption pass into the high pressure oil of same traffic, high pressure oil can promote the gravity that left cylinder piston and left cylinder piston rod and right cylinder piston and right cylinder piston rod overcome weight with identical speed, realize the synchronous lifting in left and right of weight.
Described loader comprises cylinder barrel, piston rod, the first epitrochoidal chamber, first piston, the second epitrochoidal chamber, upper exhaust gear, lower exhaust gear, the 3rd epitrochoidal chamber, the second piston, the 4th epitrochoidal chamber.Described piston rod and first piston and the second piston link into an integrated entity, be installed in cylinder barrel, form the first epitrochoidal chamber, the second epitrochoidal chamber, the 3rd epitrochoidal chamber, the 4th epitrochoidal chamber, first epitrochoidal chamber is connected with air by the upper exhaust gear be arranged on cylinder barrel, second epitrochoidal chamber is connected with external system by pipeline six, 3rd epitrochoidal chamber is connected with air by the lower exhaust gear be arranged on cylinder barrel, and the 4th epitrochoidal chamber is connected with external system by pipeline five.
Described driving oil cylinder comprises driving cylinder upper cavity oil, drives oil cylinder piston, drives oil cylinder cavity of resorption, drives cylinder piston rod.Drive cylinder upper cavity oil to be connected with the upper oil outlet of the first solenoid directional control valve by pipeline seven, drive oil cylinder cavity of resorption to be connected with the lower oil outlet of the first solenoid directional control valve by pipeline eight, drive cylinder piston rod lower end to be connected with the upper end of piston rod.
Described piston rod can drive first piston and the second piston to move up and down in cylinder barrel together, when driving cylinder piston rod promotion piston rod to move downward, piston rod drives first piston and the second piston to move downward together in cylinder barrel, and the fluid pressurized in the second epitrochoidal chamber and the 4th epitrochoidal chamber contracts and can discharge; When driving cylinder piston rod to pull piston rod upward movement, piston rod drives first piston and the second piston upward movement together in cylinder barrel, produces negative pressure, and can suck fluid from outside in the second epitrochoidal chamber and the 4th epitrochoidal chamber.
Described fuel tank is connected by the oil inlet of pipeline 14 with the 3rd hydraulic control one-way valve; Be connected by the oil inlet of pipeline 15 with the first hydraulic control one-way valve; Be connected by the return opening of pipeline 13 with the second solenoid directional control valve.4th epitrochoidal chamber of described loader is connected with the oil outlet of the 3rd hydraulic control one-way valve and the oil inlet of the 4th hydraulic control one-way valve respectively by pipeline five.Second epitrochoidal chamber of described loader is connected with the oil outlet of the first hydraulic control one-way valve and the oil inlet of the second hydraulic control one-way valve respectively by pipeline six.The left cylinder cavity of resorption of described left lifting cylinder is connected by the oil outlet of pipeline one with the 4th hydraulic control one-way valve, is also connected with the left oil inleting port of shuttle valve by pipeline.The left cylinder cavity of resorption of described right lifting cylinder is connected by the oil outlet of pipeline two with the second hydraulic control one-way valve, is also connected with the right oil inlet of shuttle valve by pipeline.Described shuttle valve can select the high pressure oil in left oil inleting port and right oil inlet to export as it, and left oil inleting port is not connected each other with right oil inlet.The oil inlet of described second solenoid directional control valve is connected with the oil outlet of shuttle valve by pipeline ten, left oil outlet is connected with the control port of the second hydraulic control one-way valve and the 4th hydraulic control one-way valve respectively by pipeline 11, and right oil outlet is connected with the control port of the first hydraulic control one-way valve and the 3rd hydraulic control one-way valve respectively by pipeline 12.The oil inlet of described first solenoid directional control valve is communicated with by pipeline nine system high pressure oil sources, and return opening is connected with fuel tank by pipeline seven, and upper oil outlet is connected with driving cylinder upper cavity oil by pipeline eight, and lower oil outlet is connected with driving oil cylinder cavity of resorption by pipeline.
The quantity of described lifting cylinder can be 2, also can be multiple.
The piston of described loader and the quantity of epitrochoidal chamber can be multiple.
Described solenoid directional control valve also can be hand change over valve, electro-hydraulic reversing valve.
Described lifting cylinder can be piston cylinder, also can plunger case.
A kind of principle of work of multi-cylinder synchronous lifting mechanism:
(1), the multi-cylinder synchronous lifting of weight: left electromagnet 1DT and the right electromagnet 2DT of the second solenoid directional control valve are in power failure state, second solenoid directional control valve is in meta, the control port of the first hydraulic control one-way valve, the second hydraulic control one-way valve, the 3rd hydraulic control one-way valve, the 4th hydraulic control one-way valve is all connected with fuel tank by the meta of connection second solenoid directional control valve, pipeline 13, and control port is without controlling oil pressure.Operate the first solenoid directional control valve, when the upper electromagnet 3DT of the first solenoid directional control valve obtains electric, during lower electromagnet 4DT dead electricity, first solenoid directional control valve is in upper, system high pressure oil is by pipeline nine, first solenoid directional control valve upper, pipeline seven enters in the driving cylinder upper cavity oil of driving oil cylinder, high pressure oil acts on the upper end driving oil cylinder piston, drive cylinder piston rod to promote piston rod to move downward, piston rod drives first piston and the second piston to move downward together in cylinder barrel, fluid in second epitrochoidal chamber and the 4th epitrochoidal chamber all by compression, second epitrochoidal chamber and the 4th epitrochoidal chamber discharge the fluid of equivalent, high-voltage oil liquid in 4th epitrochoidal chamber is by pipeline five, pipeline three, 4th hydraulic control one-way valve, pipeline one enters in the left cylinder cavity of resorption of left lifting cylinder, high-voltage oil liquid in second epitrochoidal chamber is by pipeline six, pipeline four, second hydraulic control one-way valve, pipeline two enters in the right cylinder cavity of resorption of right lifting cylinder, the equivalent high-voltage oil liquid of discharging in the second epitrochoidal chamber and the 4th epitrochoidal chamber, act on the lower end of left cylinder piston and right cylinder piston respectively, overcome the Action of Gravity Field of weight, promote left cylinder piston and right cylinder piston upwards, and ensure the displacement that two oil cylinders are identical, namely realize the synchronous lifting of weight, when piston rod moves downward, after first piston or the second piston reach forced stroke, the upper electromagnet 3DT dead electricity of the first solenoid directional control valve, lower electromagnet 4DT obtains electric, first solenoid directional control valve is in bottom, system high pressure oil is by pipeline nine, the bottom of the first solenoid directional control valve, pipeline eight enters and drives in oil cylinder cavity of resorption, high pressure oil acts on the lower end driving oil cylinder piston, cylinder piston rod is driven to pull piston rod upward movement, piston rod drives first piston and the second piston upward movement together in cylinder barrel, negative pressure is produced in second epitrochoidal chamber and the 4th epitrochoidal chamber, and the fluid of equivalent is sucked from outside, 4th epitrochoidal chamber is by pipeline five, pipeline three, 3rd hydraulic control one-way valve, pipeline 14 sucks fluid from fuel tank, second epitrochoidal chamber is by pipeline six, pipeline four, first hydraulic control one-way valve, pipeline 15 sucks fluid from fuel tank, because first piston and the second piston displacement of upward movement in cylinder barrel is identical, 4th epitrochoidal chamber and the second epitrochoidal chamber suck the fluid of equivalent from outside.By repeating above course of action, namely can constantly upwardly left cylinder piston and right cylinder piston, and ensure the displacement that two oil cylinders are identical, realize the continuous synchronization lifting of weight.
(2), the stop of weight: the upper electromagnet 3DT of the first solenoid directional control valve and lower electromagnet 4DT is in power failure state, and the first solenoid directional control valve is in meta, and system high pressure oil gets back to fuel tank, system unloaded by the meta of pipeline nine, first solenoid directional control valve.Left electromagnet 1DT and the right electromagnet 2DT of the second solenoid directional control valve are in power failure state, second solenoid directional control valve is in meta, the control port of the first hydraulic control one-way valve, the second hydraulic control one-way valve, the 3rd hydraulic control one-way valve, the 4th hydraulic control one-way valve is all connected with fuel tank by the meta of connection second solenoid directional control valve, pipeline 13, and control port is without controlling oil pressure.Driving oil cylinder piston is in the lock state, drive cylinder piston rod and piston rod stop motion, the Action of Gravity Field of weight is on left cylinder piston and right cylinder piston, corresponding oil pressure is formed in left cylinder cavity of resorption and right cylinder cavity of resorption, and acting in opposition is in the oil outlet of the 4th hydraulic control one-way valve and the second hydraulic control one-way valve, make the 4th hydraulic control one-way valve and the second hydraulic control one-way valve be in closed condition, the fluid in left cylinder cavity of resorption and right cylinder cavity of resorption cannot flow out, and weight is in resting state.
(3), the multi-cylinder synchronous of weight declines: the left electromagnet 1DT of the second solenoid directional control valve is in obtain electricity condition, right electromagnet 2DT is in power failure state, second solenoid directional control valve is in left position, on the one hand, the high-voltage oil liquid of left cylinder cavity of resorption and right cylinder cavity of resorption selected by shuttle valve, and by pipeline ten, the second left position of solenoid directional control valve, pipeline 11, be communicated to the second hydraulic control one-way valve, the control port of the 4th hydraulic control one-way valve, due to the second hydraulic control one-way valve, the control port of the 4th hydraulic control one-way valve is high pressure oil, second hydraulic control one-way valve, 4th hydraulic control one-way valve is reversed unlatching, on the other hand, the control port of the first hydraulic control one-way valve, the 3rd hydraulic control one-way valve is connected with fuel tank by the left position of pipeline 12, second solenoid directional control valve, pipeline 13, and the control port of the first hydraulic control one-way valve, the 3rd hydraulic control one-way valve is without control oil pressure.The Action of Gravity Field of weight is on left cylinder piston and right cylinder piston, corresponding oil pressure is formed in left cylinder cavity of resorption and right cylinder cavity of resorption, high-voltage oil liquid in left cylinder cavity of resorption can pass through the 4th hydraulic control one-way valve reverse circulated, and flow in the 4th epitrochoidal chamber of loader through pipeline five, high-voltage oil liquid in right cylinder cavity of resorption can pass through the second hydraulic control one-way valve reverse circulated, and flow in the second epitrochoidal chamber of loader through pipeline six, operate the first solenoid directional control valve, make the upper electromagnet 3DT dead electricity of the first solenoid directional control valve, lower electromagnet 4DT obtains electric, first solenoid directional control valve is in bottom, system high pressure oil is by pipeline nine, the bottom of the first solenoid directional control valve, pipeline eight enters and drives in oil cylinder cavity of resorption, high pressure oil acts on the lower end driving oil cylinder piston, cylinder piston rod is driven to pull piston rod upward movement, piston rod drives first piston and the second piston upward movement together in cylinder barrel, because first piston and the second piston displacement of upward movement in cylinder barrel is identical, that is, the volume of the fluid in the 4th epitrochoidal chamber of inflow loader and in the second epitrochoidal chamber is identical, namely the volume of the fluid of left cylinder cavity of resorption and the discharge of right cylinder cavity of resorption is identical, left cylinder piston and right cylinder piston define identical downward displacement, the multi-cylinder synchronous achieving weight declines.When piston rod upward movement, after first piston or the second piston reach forced stroke, the left electromagnet 1DT of the second solenoid directional control valve is in power failure state, right electromagnet 2DT is in obtain electricity condition, second solenoid directional control valve is in right position, on the one hand, the high-voltage oil liquid of left cylinder cavity of resorption and right cylinder cavity of resorption selected by shuttle valve, and by pipeline ten, the second right position of solenoid directional control valve, pipeline 12, be communicated to the first hydraulic control one-way valve, the control port of the 3rd hydraulic control one-way valve, due to the first hydraulic control one-way valve, the control port of the 3rd hydraulic control one-way valve is high pressure oil, first hydraulic control one-way valve, 3rd hydraulic control one-way valve is reversed unlatching, on the other hand, the control port of the second hydraulic control one-way valve, the 4th hydraulic control one-way valve is connected with fuel tank by the right position of pipeline 11, second solenoid directional control valve, pipeline 13, and the control port of the second hydraulic control one-way valve, the 4th hydraulic control one-way valve is without control oil pressure.Operate the first solenoid directional control valve, the upper electromagnet 3DT of the first solenoid directional control valve is made to obtain electric, lower electromagnet 4DT dead electricity, first solenoid directional control valve is in upper, system high pressure oil is by pipeline nine, first solenoid directional control valve upper, pipeline seven enters in the driving cylinder upper cavity oil of driving oil cylinder, high pressure oil acts on the upper end driving oil cylinder piston, drive cylinder piston rod to promote piston rod to move downward, piston rod drives first piston and the second piston to move downward together in cylinder barrel, fluid in second epitrochoidal chamber and the 4th epitrochoidal chamber all by compression, second epitrochoidal chamber and the 4th epitrochoidal chamber discharge the fluid of equivalent, fluid in 4th epitrochoidal chamber is by pipeline five, pipeline three, 3rd hydraulic control one-way valve, pipeline 14 is got back in fuel tank, fluid in second epitrochoidal chamber is by pipeline six, pipeline four, first hydraulic control one-way valve, pipeline 15 is got back in fuel tank.When piston rod moves downward, after first piston or the second piston reach forced stroke, again make the left electromagnet 1DT of the second solenoid directional control valve be in obtain electricity condition, right electromagnet 2DT is in power failure state, and the second solenoid directional control valve is in left position.By repeating above course of action, namely constantly can move down left cylinder piston and right cylinder piston, and ensureing the displacement that two oil cylinders are identical, the continuous synchronization realizing weight declines.
A kind of multi-cylinder synchronous lifting mechanism provided by the invention, structure is simple, reliable operation, fully can ensure the steady lifting of the multi-cylinder synchronous of large scale weight and decline.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, multi-cylinder synchronous lifting mechanism, comprise: left lifting cylinder 2, right lifting cylinder 3, loader 4, first solenoid directional control valve 5, fuel tank 9, second solenoid directional control valve 10, shuttle valve 12, first hydraulic control one-way valve 11, second hydraulic control one-way valve 13, 3rd hydraulic control one-way valve 14, 4th hydraulic control one-way valve 16, drive oil cylinder 18 and some pipelines, pipeline comprises pipeline one 2-7, pipeline two 3-7, pipeline three 14-1, pipeline four 11-1, pipeline five 4-12, pipeline six 4-11, pipeline 76, pipeline 87, pipeline 98, pipeline ten 12-1, pipeline 11, pipeline 12, pipeline 13 9-3, pipeline 14 9-1, pipeline 15 9-2.
Left lifting cylinder 2 and right lifting cylinder 3 be placed in respectively mechanism lift left and right sides below weight 1.Left lifting cylinder 2 comprises left cylinder epicoele 2-1, left cylinder piston rod 2-2, left cylinder piston 2-3, left cylinder cavity of resorption 2-4, left cylinder cylinder barrel 2-5, left cylinder exhaust gear 2-6, left side below left cylinder piston rod 2-2 and weight 1 offsets, left cylinder epicoele 2-1 is connected with air by the left cylinder exhaust gear 2-6 be arranged on left cylinder cylinder barrel 2-5, if left cylinder cavity of resorption 2-4 passes into high pressure oil, act on the lower end of left cylinder piston 2-3, the gravity that left cylinder piston 2-3 and left cylinder piston rod 2-2 overcomes weight 1 can be promoted, realize the left side upwards lifting of weight 1; Right lifting cylinder 3 comprises right cylinder epicoele 3-1, right cylinder piston rod 3-2, right cylinder piston 3-3, right cylinder cavity of resorption 3-4, right cylinder cylinder barrel 3-5, right cylinder exhaust gear 3-6, right side below right cylinder piston rod 3-2 and weight 1 offsets, right cylinder epicoele 3-1 is connected with air by the right cylinder exhaust gear 3-6 be arranged on right cylinder cylinder barrel 3-5, if right cylinder cavity of resorption 3-4 passes into high pressure oil, act on the lower end of right cylinder piston 3-3, the gravity that right cylinder piston 3-3 and right cylinder piston rod 3-2 overcomes weight 1 can be promoted, realize the right side upwards lifting of weight 1.If left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4 passes into the high pressure oil of same traffic, high pressure oil can promote the gravity that left cylinder piston 2-3 and left cylinder piston rod 2-2 and right cylinder piston 3-3 and right cylinder piston rod 3-2 overcomes weight 1 with identical speed, realize the synchronous lifting in left and right of weight 1.
Loader 4 comprises cylinder barrel 4-1, piston rod 4-2, the first epitrochoidal chamber 4-3, first piston 4-4, the second epitrochoidal chamber 4-5, upper exhaust gear 4-6, lower exhaust gear 4-7, the 3rd epitrochoidal chamber 4-8, the second piston 4-9, the 4th epitrochoidal chamber 4-10.Piston rod 4-2 and first piston 4-4 and the second piston 4-9 links into an integrated entity, be installed in cylinder barrel 4-1, form the first epitrochoidal chamber 4-3, the second epitrochoidal chamber 4-5, the 3rd epitrochoidal chamber 4-8, the 4th epitrochoidal chamber 4-10, first epitrochoidal chamber 4-3 is connected with air by the upper exhaust gear 4-6 be arranged on cylinder barrel 4-1, second epitrochoidal chamber 4-5 is connected with external system by pipeline six 4-11,3rd epitrochoidal chamber 4-8 is connected with air by the lower exhaust gear 4-7 be arranged on cylinder barrel 4-1, and the 4th epitrochoidal chamber 4-10 is connected with external system by pipeline five 4-12.
Drive oil cylinder 18 to comprise and drive cylinder upper cavity oil 18-1, drive oil cylinder piston 18-2, drive oil cylinder cavity of resorption 18-3, drive cylinder piston rod 18-4.Cylinder upper cavity oil 18-1 is driven to be connected by the upper oil outlet of pipeline 76 with the first solenoid directional control valve 5, drive oil cylinder cavity of resorption 18-3 to be connected by the lower oil outlet of pipeline 87 with the first solenoid directional control valve 5, drive cylinder piston rod 18-4 lower end to be connected with the upper end of piston rod 4-2.
Piston rod 4-2 can drive first piston 4-4 and the second piston 4-9 to move up and down in cylinder barrel 4-1 together, when driving cylinder piston rod 18-4 promotion piston rod 4-2 to move downward, piston rod 4-2 drives first piston 4-4 and the second piston 4-9 to move downward together in cylinder barrel 4-1, and the fluid pressurized in the second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10 contracts and can discharge; When driving cylinder piston rod 18-4 to pull piston rod 4-2 upward movement, piston rod 4-2 drives first piston 4-4 and the second piston 4-9 upward movement together in cylinder barrel 4-1, produce negative pressure in second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10, and fluid can be sucked from outside.
Fuel tank 9 is connected with the oil inlet of the 3rd hydraulic control one-way valve 14 by pipeline 14 9-1; Be connected with the oil inlet of the first hydraulic control one-way valve 11 by pipeline 15 9-2; Be connected with the return opening of the second solenoid directional control valve 10 by pipeline 13 9-3.4th epitrochoidal chamber 4-10 of loader 4 is connected with the oil outlet of the 3rd hydraulic control one-way valve 14 and the oil inlet of the 4th hydraulic control one-way valve 16 respectively by pipeline five 4-12.Second epitrochoidal chamber 4-5 of described loader 4 is connected with the oil outlet of the first hydraulic control one-way valve 11 and the oil inlet of the second hydraulic control one-way valve 13 respectively by pipeline six 4-11.The left cylinder cavity of resorption 2-4 of described left lifting cylinder 2 is connected with the oil outlet of the 4th hydraulic control one-way valve 16 by pipeline one 2-7, is also connected by the left oil inleting port of pipeline with shuttle valve 12.The left cylinder cavity of resorption 3-4 of right lifting cylinder 3 is connected with the oil outlet of the second hydraulic control one-way valve 13 by pipeline two 3-7, is also connected with the right oil inlet of shuttle valve 12 by pipeline.Shuttle valve 12 can select the high pressure oil in left oil inleting port and right oil inlet to export as it, and left oil inleting port is not connected each other with right oil inlet.The oil inlet of the second solenoid directional control valve 10 is connected with the oil outlet of shuttle valve 12 by pipeline ten 12-1, left oil outlet is connected with the control port of the second hydraulic control one-way valve 13 and the 4th hydraulic control one-way valve 16 respectively by pipeline 11, and right oil outlet is connected with the control port of the first hydraulic control one-way valve 11 and the 3rd hydraulic control one-way valve 14 respectively by pipeline 12.The oil inlet of the first solenoid directional control valve 5 is communicated with system high pressure oil sources by pipeline 98, return opening is connected with fuel tank, upper oil outlet is connected with driving cylinder upper cavity oil 18-1 by pipeline 76, and lower oil outlet is connected with driving oil cylinder cavity of resorption 18-3 by pipeline 87.
Preferably, the quantity of above-mentioned lifting cylinder can be 2, also can be multiple.
Preferably, the piston of above-mentioned loader and the quantity of epitrochoidal chamber can be multiple.
Preferably, above-mentioned solenoid directional control valve also can be hand change over valve, electro-hydraulic reversing valve.
Preferably, above-mentioned lifting cylinder can be piston cylinder, also can plunger case.
A kind of principle of work of multi-cylinder synchronous lifting mechanism:
(1), the multi-cylinder synchronous lifting of weight 1: left electromagnet 1DT and the right electromagnet 2DT of the second solenoid directional control valve 10 are in power failure state, second solenoid directional control valve 10 is in meta, the control port of the first hydraulic control one-way valve 11, second hydraulic control one-way valve 13, the 3rd hydraulic control one-way valve 14, the 4th hydraulic control one-way valve 16 is all connected by the meta of connection second solenoid directional control valve 10, pipeline 13 9-3 and fuel tank 9, and control port is without control oil pressure.Operate the first solenoid directional control valve 5, when the upper electromagnet 3DT of the first solenoid directional control valve 5 obtains electric, during lower electromagnet 4DT dead electricity, first solenoid directional control valve 5 is in upper, system high pressure oil is by pipeline 98, first solenoid directional control valve 5 upper, pipeline 76 enters in the driving cylinder upper cavity oil 18-1 of driving oil cylinder 18, high pressure oil acts on the upper end driving oil cylinder piston 18-2, drive cylinder piston rod 18-4 to promote piston rod 4-2 to move downward, piston rod 4-2 drives first piston 4-4 and the second piston 4-9 to move downward together in cylinder barrel 4-1, fluid in second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10 all by compression, second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10 discharges the fluid of equivalent, high-voltage oil liquid in 4th epitrochoidal chamber 4-10 is by pipeline five 4-12, pipeline three 14-1, 4th hydraulic control one-way valve 16, pipeline one 2-7 enters in the left cylinder cavity of resorption 2-4 of left lifting cylinder 2, high-voltage oil liquid in second epitrochoidal chamber 4-5 is by pipeline six 4-11, pipeline four 11-1, second hydraulic control one-way valve 13, pipeline two 3-7 enters in the right cylinder cavity of resorption 3-4 of right lifting cylinder 3, the equivalent high-voltage oil liquid of discharging in the second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10, act on the lower end of left cylinder piston 2-3 and right cylinder piston 3-3 respectively, overcome the Action of Gravity Field of weight, promote left cylinder piston 2-3 and right cylinder piston 3-3 upward movement, and ensure the displacement that two oil cylinders are identical, namely realize the synchronous lifting of weight, when piston rod 4-2 moves downward, after first piston 4-4 or the second piston 4-9 reaches forced stroke, the upper electromagnet 3DT dead electricity of the first solenoid directional control valve 5, lower electromagnet 4DT obtains electric, first solenoid directional control valve 5 is in bottom, system high pressure oil is by pipeline 98, the bottom of the first solenoid directional control valve 5, pipeline 87 enters and drives in oil cylinder cavity of resorption 18-3, high pressure oil acts on the lower end driving oil cylinder piston 18-2, cylinder piston rod 18-4 is driven to pull piston rod 4-2 upward movement, piston rod 4-2 drives first piston 4-4 and the second piston 4-9 upward movement together in cylinder barrel 4-1, negative pressure is produced in second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10, and the fluid of equivalent is sucked from outside, 4th epitrochoidal chamber 4-10 is by pipeline five 4-12, pipeline three 14-1, 3rd hydraulic control one-way valve 14, pipeline 14 9-1 sucks fluid from fuel tank 9, second epitrochoidal chamber 4-5 is by pipeline six 4-11, pipeline four 11-1, first hydraulic control one-way valve 11, pipeline 15 9-2 sucks fluid from fuel tank 9, due to first piston 4-4 and the second piston 4-9, the displacement of upward movement in cylinder barrel 4-1 is identical, 4th epitrochoidal chamber 4-10 and the second epitrochoidal chamber 4-5 sucks the fluid of equivalent from outside.By repeating above course of action, namely can continuous upwardly left cylinder piston 2-3 and right cylinder piston 3-3, and ensure the displacement that two oil cylinders are identical, realize the continuous synchronization lifting of weight.
(2), the stop of weight 1: the upper electromagnet 3DT of the first solenoid directional control valve 5 and lower electromagnet 4DT is in power failure state, first solenoid directional control valve 5 is in meta, system high pressure oil gets back to fuel tank, system unloaded by the meta of pipeline 98, first solenoid directional control valve 5.Left electromagnet 1DT and the right electromagnet 2DT of the second solenoid directional control valve 10 are in power failure state, second solenoid directional control valve 10 is in meta, the control port of the first hydraulic control one-way valve 11, second hydraulic control one-way valve 13, the 3rd hydraulic control one-way valve 14, the 4th hydraulic control one-way valve 16 is all connected by the meta of connection second solenoid directional control valve 10, pipeline 13 9-3 and fuel tank 9, and control port is without control oil pressure.Oil cylinder piston 18-2 is driven to be in the lock state, drive cylinder piston rod 18-4 and piston rod 4-2 stop motion, the Action of Gravity Field of weight 1 is on left cylinder piston 2-3 and right cylinder piston 3-3, corresponding oil pressure is formed in left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4, and acting in opposition is in the oil outlet of the 4th hydraulic control one-way valve 16 and the second hydraulic control one-way valve 13, the 4th hydraulic control one-way valve 16 and the second hydraulic control one-way valve 13 is made to be in closed condition, fluid in left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4 cannot flow out, and weight 1 is in resting state.
(3), the multi-cylinder synchronous of weight 1 declines: the left electromagnet 1DT of the second solenoid directional control valve 10 is in obtain electricity condition, right electromagnet 2DT is in power failure state, second solenoid directional control valve 10 is in left position, on the one hand, the high-voltage oil liquid of left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4 selected by shuttle valve 12, and by pipeline ten 12-1, the second left position of solenoid directional control valve 10, pipeline 11, be communicated to the second hydraulic control one-way valve 13, the control port of the 4th hydraulic control one-way valve 16, due to the second hydraulic control one-way valve 13, the control port of the 4th hydraulic control one-way valve 16 is high pressure oil, second hydraulic control one-way valve 13, 4th hydraulic control one-way valve 16 is reversed unlatching, on the other hand, the control port of the first hydraulic control one-way valve 11, the 3rd hydraulic control one-way valve 14 is connected by the left position of pipeline 12, second solenoid directional control valve 10, pipeline 13 9-3 and fuel tank 9, and the control port of the first hydraulic control one-way valve 11, the 3rd hydraulic control one-way valve 14 is without control oil pressure.The Action of Gravity Field of weight 1 is on left cylinder piston 2-3 and right cylinder piston 3-3, corresponding oil pressure is formed in left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4, high-voltage oil liquid in left cylinder cavity of resorption 2-4 can pass through the 4th hydraulic control one-way valve 16 reverse circulated, and in the 4th epitrochoidal chamber 4-10 that pipeline five 4-12 flows into loader 4, high-voltage oil liquid in right cylinder cavity of resorption 3-4 can pass through the second hydraulic control one-way valve 13 reverse circulated, and in the second epitrochoidal chamber 4-5 that pipeline six 4-11 flows into loader 4, operate the first solenoid directional control valve 5, make the upper electromagnet 3DT dead electricity of the first solenoid directional control valve 5, lower electromagnet 4DT obtains electric, first solenoid directional control valve 5 is in bottom, system high pressure oil is by pipeline 98, the bottom of the first solenoid directional control valve 5, pipeline 87 enters and drives in oil cylinder cavity of resorption 18-3, high pressure oil acts on the lower end driving oil cylinder piston 18-2, cylinder piston rod 18-4 is driven to pull piston rod 4-2 upward movement, piston rod 4-2 drives first piston 4-4 and the second piston 4-9 upward movement together in cylinder barrel 4-1, due to first piston 4-4 and the second piston 4-9, the displacement of upward movement in cylinder barrel 4-1 is identical, that is, the volume of the fluid in the 4th epitrochoidal chamber 4-10 of inflow loader 4 and in the second epitrochoidal chamber 4-5 is identical, namely the volume of the fluid of left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4 discharge is identical, left cylinder piston 2-3 and right cylinder piston 3-3 defines identical downward displacement, the multi-cylinder synchronous achieving weight 1 declines.When piston rod 4-2 upward movement, after first piston 4-4 or the second piston 4-9 reaches forced stroke, the left electromagnet 1DT of the second solenoid directional control valve 10 is in power failure state, right electromagnet 2DT is in obtain electricity condition, second solenoid directional control valve 10 is in right position, on the one hand, the high-voltage oil liquid of left cylinder cavity of resorption 2-4 and right cylinder cavity of resorption 3-4 selected by shuttle valve 12, and by pipeline ten 12-1, the second right position of solenoid directional control valve 10, pipeline 12, be communicated to the first hydraulic control one-way valve 11, the control port of the 3rd hydraulic control one-way valve 14, due to the first hydraulic control one-way valve 11, the control port of the 3rd hydraulic control one-way valve 14 is high pressure oil, first hydraulic control one-way valve 11, 3rd hydraulic control one-way valve 14 is reversed unlatching, on the other hand, the control port of the second hydraulic control one-way valve 13, the 4th hydraulic control one-way valve 16 is connected by the right position of pipeline 11, second solenoid directional control valve 10, pipeline 13 9-3 and fuel tank 9, and the control port of the second hydraulic control one-way valve 13, the 4th hydraulic control one-way valve 16 is without control oil pressure.Operate the first solenoid directional control valve 5, the upper electromagnet 3DT of the first solenoid directional control valve 5 is made to obtain electric, lower electromagnet 4DT dead electricity, first solenoid directional control valve 5 is in upper, system high pressure oil is by pipeline 98, first solenoid directional control valve 5 upper, pipeline 76 enters in the driving cylinder upper cavity oil 18-1 of driving oil cylinder 18, high pressure oil acts on the upper end driving oil cylinder piston 18-2, drive cylinder piston rod 18-4 to promote piston rod 4-2 to move downward, piston rod 4-2 drives first piston 4-4 and the second piston 4-9 to move downward together in cylinder barrel 4-1, fluid in second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10 all by compression, second epitrochoidal chamber 4-5 and the 4th epitrochoidal chamber 4-10 discharges the fluid of equivalent, fluid in 4th epitrochoidal chamber 4-10 is by pipeline five 4-12, pipeline three 14-1, 3rd hydraulic control one-way valve 14, pipeline 14 9-1 gets back in fuel tank 9, fluid in second epitrochoidal chamber 4-5 is by pipeline six 4-11, pipeline four 11-1, first hydraulic control one-way valve 11, pipeline 15 9-2 gets back in fuel tank 9.When piston rod 4-2 moves downward, after first piston 4-4 or the second piston 4-9 reaches forced stroke, again make the left electromagnet 1DT of the second solenoid directional control valve 10 be in obtain electricity condition, right electromagnet 2DT is in power failure state, and the second solenoid directional control valve 10 is in left position.By repeating above course of action, namely constantly can move down left cylinder piston 2-3 and right cylinder piston 3-3, and ensureing the displacement that two oil cylinders are identical, the continuous synchronization realizing weight declines.
A kind of multi-cylinder synchronous lifting mechanism provided by the invention, structure is simple, reliable operation, fully can ensure the steady lifting of the multi-cylinder synchronous of large scale weight and decline.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. multi-cylinder synchronous lifting mechanism, is characterized in that comprising: left lifting cylinder, right lifting cylinder, loader, the first solenoid directional control valve, fuel tank, the second solenoid directional control valve, shuttle valve, the first hydraulic control one-way valve, the second hydraulic control one-way valve, the 3rd hydraulic control one-way valve, the 4th hydraulic control one-way valve, driving oil cylinder and some pipelines; Pipeline comprises pipeline one, pipeline two, pipeline three, pipeline four, pipeline five, pipeline six, pipeline seven, pipeline eight, pipeline nine, pipeline ten, pipeline 11, pipeline 12, pipeline 13, pipeline 14, pipeline 15;
Described left lifting cylinder and right lifting cylinder be placed in respectively mechanism lift left and right sides below weight; Described left lifting cylinder comprises left cylinder epicoele, left cylinder piston rod, left cylinder piston, left cylinder cavity of resorption, left cylinder cylinder barrel, left cylinder exhaust gear, left side below described left cylinder piston rod and weight offsets, described left cylinder epicoele is connected with air by the left cylinder exhaust gear be arranged on left cylinder cylinder barrel, described left cylinder cavity of resorption passes into high pressure oil, act on the lower end of left cylinder piston, the gravity that left cylinder piston and left cylinder piston rod overcome weight can be promoted, realize the left side upwards lifting of weight; Described right lifting cylinder comprises right cylinder epicoele, right cylinder piston rod, right cylinder piston, right cylinder cavity of resorption, right cylinder cylinder barrel, right cylinder exhaust gear, right side below described right cylinder piston rod and weight offsets, described right cylinder epicoele is connected with air by the right cylinder exhaust gear be arranged on right cylinder cylinder barrel, if right cylinder cavity of resorption passes into high pressure oil, act on the lower end of right cylinder piston, the gravity that right cylinder piston and right cylinder piston rod overcome weight can be promoted, realize the right side upwards lifting of weight; Described left cylinder cavity of resorption and right cylinder cavity of resorption pass into the high pressure oil of same traffic, and high pressure oil can promote the gravity that left cylinder piston, left cylinder piston rod and right cylinder piston, right cylinder piston rod overcome weight with identical speed, realize the synchronous lifting in left and right of weight;
Described loader comprises cylinder barrel, piston rod, the first epitrochoidal chamber, first piston, the second epitrochoidal chamber, upper exhaust gear, lower exhaust gear, the 3rd epitrochoidal chamber, the second piston, the 4th epitrochoidal chamber; Described piston rod and first piston and the second piston link into an integrated entity, be installed in cylinder barrel, form the first epitrochoidal chamber, the second epitrochoidal chamber, the 3rd epitrochoidal chamber, the 4th epitrochoidal chamber, described first epitrochoidal chamber is connected with air by the upper exhaust gear be arranged on cylinder barrel, second epitrochoidal chamber is connected with external system by pipeline six, 3rd epitrochoidal chamber is connected with air by the lower exhaust gear be arranged on cylinder barrel, and the 4th epitrochoidal chamber is connected with external system by pipeline five;
Described driving oil cylinder comprises driving cylinder upper cavity oil, drives oil cylinder piston, drives oil cylinder cavity of resorption, drives cylinder piston rod; Described driving cylinder upper cavity oil is connected with the upper oil outlet of the first solenoid directional control valve by pipeline seven, drives oil cylinder cavity of resorption to be connected with the lower oil outlet of the first solenoid directional control valve by pipeline eight, drives cylinder piston rod lower end to be connected with the upper end of piston rod;
Described piston rod can drive first piston and the second piston to move up and down in cylinder barrel together, when driving cylinder piston rod promotion piston rod to move downward, piston rod drives first piston and the second piston to move downward together in cylinder barrel, and the fluid pressurized in the second epitrochoidal chamber and the 4th epitrochoidal chamber contracts and can discharge; When driving cylinder piston rod to pull piston rod upward movement, piston rod drives first piston and the second piston upward movement together in cylinder barrel, produces negative pressure, and can suck fluid from outside in the second epitrochoidal chamber and the 4th epitrochoidal chamber;
Described fuel tank is connected by the oil inlet of pipeline 14 with the 3rd hydraulic control one-way valve; Be connected by the oil inlet of pipeline 15 with the first hydraulic control one-way valve; Be connected by the return opening of pipeline 13 with the second solenoid directional control valve; 4th epitrochoidal chamber of described loader is connected with the oil outlet of the 3rd hydraulic control one-way valve and the oil inlet of the 4th hydraulic control one-way valve respectively by pipeline five; Second epitrochoidal chamber of described loader is connected with the oil outlet of the first hydraulic control one-way valve and the oil inlet of the second hydraulic control one-way valve respectively by pipeline six; The left cylinder cavity of resorption of described left lifting cylinder is connected by the oil outlet of pipeline one with the 4th hydraulic control one-way valve, is also connected with the left oil inleting port of shuttle valve by pipeline; The left cylinder cavity of resorption of described right lifting cylinder is connected by the oil outlet of pipeline two with the second hydraulic control one-way valve, is also connected with the right oil inlet of shuttle valve by pipeline; Described shuttle valve can select the high pressure oil in left oil inleting port and right oil inlet to export as it, and left oil inleting port is not connected each other with right oil inlet; The oil inlet of described second solenoid directional control valve is connected with the oil outlet of shuttle valve by pipeline ten, left oil outlet is connected with the control port of the second hydraulic control one-way valve and the 4th hydraulic control one-way valve respectively by pipeline 11, and right oil outlet is connected with the control port of the first hydraulic control one-way valve and the 3rd hydraulic control one-way valve respectively by pipeline 12; The oil inlet of described first solenoid directional control valve is communicated with system high pressure oil sources by pipeline nine, return opening is connected with fuel tank by pipeline, upper oil outlet is connected with driving cylinder upper cavity oil by pipeline seven, and lower oil outlet is connected with driving oil cylinder cavity of resorption by pipeline eight.
2. multi-cylinder synchronous lifting mechanism according to claim 1, is characterized in that: the quantity of described lifting cylinder is more than 2.
3. multi-cylinder synchronous lifting mechanism according to claim 1, is characterized in that: the piston of described loader and the quantity of epitrochoidal chamber are multiple.
4. multi-cylinder synchronous lifting mechanism according to claim 1, is characterized in that: described solenoid directional control valve is hand change over valve or electro-hydraulic reversing valve.
5. multi-cylinder synchronous lifting mechanism according to claim 1, is characterized in that: described lifting cylinder is piston cylinder or plunger case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410060582.2A CN103771286B (en) | 2014-02-24 | 2014-02-24 | Multi-cylinder synchronous lifting mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410060582.2A CN103771286B (en) | 2014-02-24 | 2014-02-24 | Multi-cylinder synchronous lifting mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103771286A CN103771286A (en) | 2014-05-07 |
| CN103771286B true CN103771286B (en) | 2016-02-10 |
Family
ID=50564137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410060582.2A Active CN103771286B (en) | 2014-02-24 | 2014-02-24 | Multi-cylinder synchronous lifting mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103771286B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107379038B (en) * | 2017-07-28 | 2022-12-30 | 涪陵天然食品有限责任公司 | Preserved szechuan pickle slicing device |
| CN108128743B (en) * | 2018-01-15 | 2024-03-22 | 宣化钢铁集团有限责任公司 | Lifting cylinder of ladle turret and control method |
| CN111056334B (en) * | 2019-12-31 | 2021-10-22 | 龙合智能装备制造有限公司 | Self-adaptive loading platform for integral loading of container |
| CN111637109A (en) * | 2020-06-16 | 2020-09-08 | 凯盛重工有限公司 | Multi-oil-cylinder related accurate positioning system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA931884A (en) * | 1969-12-30 | 1973-08-14 | Sherman W. Bushnell, Jr. | Multi-stage lift |
| CN2087616U (en) * | 1988-07-30 | 1991-10-30 | 武汉钢铁学院 | Multi-cylinder synchronous controller for hydraulic elevator |
| JP2004217396A (en) * | 2003-01-17 | 2004-08-05 | Quality:Kk | Table lifter |
| CN201250084Y (en) * | 2008-05-09 | 2009-06-03 | 太仓高德升降机有限公司 | Multicylinder synchronous hydraulic elevator |
| CN101367488A (en) * | 2008-09-02 | 2009-02-18 | 芜湖市银鸿液压件有限公司 | Hydraulic lifting apparatus |
-
2014
- 2014-02-24 CN CN201410060582.2A patent/CN103771286B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103771286A (en) | 2014-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101078395A (en) | Highly effective hydraulic drive fluid pump | |
| CN203383792U (en) | Balanced type one-machine multi-well energy saving hydraulic pumping unit | |
| CN206035914U (en) | Four jar synchronous hydraulic system of automobile elevator | |
| CN201661532U (en) | Hydraulic pumping system of concrete pump | |
| CN103771286B (en) | Multi-cylinder synchronous lifting mechanism | |
| CN205136180U (en) | Hydraulic system of big indisputable fill compression dustbin compression material loading simultaneous working | |
| WO2007041935A1 (en) | Hydraulic reciprocating pump | |
| CN103174687B (en) | Pressurized and energy storing type energy-saving hydraulic pumping unit | |
| CN101592026A (en) | A kind of novel energy-conserving hydraulic pumping unit | |
| CN103771289B (en) | Multi-cylinder synchronous lifting mechanism | |
| CN110228768A (en) | A kind of synchronization lifting mechanism of heavy duty four-way shuttle robot | |
| CN205371124U (en) | Concrete feeding pump hydraulic system | |
| CN103771287B (en) | A kind of multi-cylinder synchronous lifting mechanism | |
| CN205063484U (en) | Fluid pressure type stereo garage liquid accuse system | |
| CN103994042A (en) | Piston type hydraulic pump with crank connecting rod structure | |
| CN203214493U (en) | Potential energy recovery hydraulic control system of lifting equipment at stable load | |
| CN213744210U (en) | Vertical garbage compressor hydraulic system with liquid charging function | |
| CN103671295B (en) | A kind of enclosed energy storage hydraulic system | |
| CN105240330A (en) | Speed-up device for hydraulic differential loop of compression oil cylinder of garbage station | |
| CN204041368U (en) | Adopt the piston type hydraulic pumps of brace and connecting rod framework | |
| CN103771288B (en) | A kind of multi-cylinder synchronous lifting mechanism | |
| CN103771290B (en) | A kind of multi-cylinder synchronous lifting mechanism | |
| CN103771291B (en) | A kind of multi-cylinder synchronous lifting mechanism | |
| CN202767158U (en) | Hydraulic excavator flow out of valve regenerating device | |
| EP2902628B1 (en) | Reciprocating low-speed heavy-load hydraulic pump with variable action area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190603 Address after: 213125 No. 99 Qingyang Road, Xuejiazhen, Xinbei District, Changzhou City, Jiangsu Province Patentee after: CHANGZHOU QIFENG CONTINUOUS EXTRUSION EQUIPMENT Co.,Ltd. Address before: 213022 No. 200 Jinling North Road, Xinbei District, Changzhou, Jiangsu Patentee before: CHANGZHOU CAMPUS OF HOHAI University |