CN109058187B - Unloading buffer hydraulic system - Google Patents
Unloading buffer hydraulic system Download PDFInfo
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- CN109058187B CN109058187B CN201810860823.XA CN201810860823A CN109058187B CN 109058187 B CN109058187 B CN 109058187B CN 201810860823 A CN201810860823 A CN 201810860823A CN 109058187 B CN109058187 B CN 109058187B
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- valve
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- pump body
- reversing valve
- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
Abstract
The invention relates to the technical field of hydraulic control, in particular to an unloading buffer hydraulic system which comprises a first pump body, a first reversing valve, a second reversing valve, a push plate oil cylinder and a first pump body low-pressure overflow valve, wherein the first pump body is communicated with a hydraulic oil tank and the second reversing valve through a main pressure oil path, two oil outlets of the second reversing valve are respectively connected with a rod cavity and a rodless cavity of the push plate oil cylinder, an oil return port of the second reversing valve is communicated with the hydraulic oil tank through an oil return pipeline, the first reversing valve is arranged between the first pump body and the second reversing valve, one end of the first pump body low-pressure overflow valve is connected to a pipeline between the first pump body and the first reversing valve, the other end of the first pump body low-pressure overflow valve is communicated with the oil return pipeline, and the push plate oil cylinder is unloaded with. The unloading buffer hydraulic system of the garbage compression box can well play the unloading buffer of the push plate oil cylinder, effectively solves the strong impact of the water hammer phenomenon, and greatly improves the safety of an oil supply pipeline of the push plate oil cylinder.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to an unloading buffer hydraulic system.
Background
At present, the compression push plate of the integral garbage compression box for compressing domestic garbage and the feeding working mode of a feeding hopper are both directly started and stopped by adopting hydraulic control.
The prior hydraulic drive system has the following problems in use: firstly, because the push plate oil cylinder is large in size, the extension and retraction of the push plate oil cylinder is determined by sensing the oil pressure in a main pressure oil way, and the pressure is basically about 20MPa, therefore, when the push plate oil cylinder performs the recovery action, a large amount of high-pressure oil seals can be closed between the push plate oil cylinder and a reversing valve, when a hydraulic system directly reverses, the high-pressure oil directly returns to an oil tank, so that the pipeline impact is large, the water hammer phenomenon is serious, and long-term impact easily causes the faults of loosening and oil leakage of a pipeline joint, shortening of the service life of a rubber pipe, damage of a sealing ring and the.
Secondly, push pedal and feeding funnel quality are big to the moving speed is fast in the course of the work, and the two is at the motion stop in-process, and the acceleration of push pedal and feeding funnel is big, and the mode of operation that directly stops can cause very big impact to push pedal and feeding funnel in the operating condition work, and this kind of huge impact force not only can produce great noise at work, causes the damage to push pedal, feeding funnel and its driving cylinder very easily moreover, shortens its life.
Thirdly, the ground condition of each rubbish station is different in actual use, therefore often there is one section motion stroke when the feeding funnel descends to the ground, and the drive speed of feeding funnel hydro-cylinder is very fast again, can't stop to accurate position by the manual work, therefore feeding funnel work cycle's hopper descending stroke often can jack up the workbin and pull a short distance forward, probably pull out longer one end distance forward when the dustbin is full, consequently causes very big work influence to the limited rubbish station in space.
Fourthly, the feeding hopper has large mass, and in case of burst of the oil cylinder rubber pipe in the feeding process, the hopper falls down to cause serious life and property loss.
Therefore, a new unloading buffer hydraulic system is urgently needed to solve the above problems.
Disclosure of Invention
Therefore, an unloading buffer hydraulic system is needed to be provided to solve the problem of serious water hammer phenomenon of a hydraulic driving system of a push plate oil cylinder in the prior art.
In order to realize the purpose, the inventor provides an unloading buffer hydraulic system, the system includes the first pump body, first switching-over valve, second switching-over valve, push pedal hydro-cylinder and first pump body low pressure overflow valve, the first pump body passes through main pressure oil circuit intercommunication hydraulic tank and second switching-over valve, two oil-outs of second switching-over valve respectively with push pedal hydro-cylinder have the pole chamber with do not have the pole chamber to be connected, the oil return opening of second switching-over valve passes through oil return line and hydraulic tank intercommunication, first switching-over valve sets up between the first pump body and second switching-over valve, first pump body low pressure overflow valve one end is connected on the pipeline between the first pump body and first switching-over valve, the other end and oil return line intercommunication, before the switching-over operation is carried out to the second switching-over valve, push pedal hydro-cylinder carries out the high-pressure oil.
As a preferred structure of the invention, the system also comprises a selector valve and a first pump body high-pressure overflow valve, wherein an oil inlet of the selector valve is connected to a main pressure oil path between the first pump body and the first reversing valve, two oil outlets of the selector valve are respectively connected with oil inlets of a first pump body low-pressure overflow valve and a first pump body high-pressure overflow valve, and oil outlets of the first pump body low-pressure overflow valve and the first pump body high-pressure overflow valve are both communicated with an oil return pipeline.
As a preferable structure of the present invention, the system further includes a second pump body and a check valve, the second pump body connects the hydraulic oil tank and the line pressure oil passage, and the check valve is located between the second pump body and the line pressure oil passage.
As a preferred structure of the invention, the system also comprises a second pump body overflow valve, the second pump body overflow valve is connected with a pipeline between the second pump body and the one-way valve, and the second pump body overflow valve is communicated with the oil return pipeline.
As a preferred structure of the present invention, the first pump body and the second pump body are components of a tandem pump.
As a preferred structure of the invention, the system also comprises a feeding hopper oil cylinder and a third reversing valve, wherein the third reversing valve is connected with the main pressure oil path, two oil outlets of the third reversing valve are respectively connected with a rod cavity and a rodless cavity of the feeding hopper oil cylinder, the third reversing valve is also communicated with an oil return pipeline, and the feeding hopper oil cylinder is unloaded by high-pressure oil before the third reversing valve performs reversing operation.
As a preferable structure of the invention, the system further comprises a two-position two-way electromagnetic valve, and the two-position two-way electromagnetic valve is connected with a rodless cavity of the upper hopper oil cylinder and a third reversing valve.
As a preferable structure of the invention, the push plate oil cylinder and the feeding hopper oil cylinder are both gradient throttling type buffer oil cylinders.
As a preferable structure of the present invention, the system further includes a pressure sensor disposed in the main pressure oil passage, the pressure sensor being configured to detect an oil pressure of the main pressure oil passage, and a controller connected to the pressure sensor, the first direction valve, the second direction valve, the third direction valve, and the selector valve, respectively.
As a preferable structure of the invention, the system further comprises a position switch, the position switch is connected with the controller, and the position switch is arranged on one side of the feeding hopper oil cylinder close to the feeding hopper.
Different from the prior art, the technical scheme has the following advantages: the hydraulic system has the advantages that the first pump body extracts hydraulic oil from the hydraulic oil tank, the hydraulic oil is sequentially sent into the rodless cavity of the push plate oil cylinder through the first reversing valve and the second reversing valve, the push plate is further pushed to advance rapidly, after the push plate oil cylinder moves in place, the second reversing valve is closed, oil supply to the rodless cavity of the push plate oil cylinder is stopped, high-pressure oil sealed between the rodless cavity of the push plate oil cylinder and the second reversing valve ensures compaction of garbage, before the second reversing valve performs reversing operation, namely the push plate oil cylinder retreats to recover the push plate, the second reversing valve, the first reversing valve and the first pump body low-pressure overflow valve are opened, so that the high-pressure oil sealed and stored between the rodless cavity of the push plate oil cylinder and the second reversing valve is recycled to the hydraulic oil tank through the oil return pipeline, therefore, the strong impact of the water hammer phenomenon is reduced, the loosening and oil leakage of the pipeline joint and even the damage of the pipeline are prevented, and the safety of the oil supply pipeline of the push plate oil cylinder is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an unloading buffer hydraulic system according to the present invention.
Description of reference numerals:
1. a first pump body;
2. a first direction changing valve;
3. a second directional control valve;
4. a push plate oil cylinder;
5. the first pump body low-pressure overflow valve;
6. a selector valve;
7. the first pump body high-pressure overflow valve;
8. a second pump body;
9. a one-way valve;
10. a second pump body overflow valve;
11. a feeding hopper cylinder;
12. a third directional control valve;
13. a two-position two-way solenoid valve;
14. a pressure sensor;
15. a position switch;
16. an electric motor.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the invention provides an unloading buffer hydraulic system, which includes a first pump body 1, a first reversing valve 2, a second reversing valve 3, a push plate cylinder 4 and a first pump body low-pressure overflow valve, wherein the first pump body 1 is communicated with a hydraulic oil tank and the second reversing valve 3 through a main pressure oil path, two oil outlets of the second reversing valve 3 are respectively connected with a rod cavity and a rodless cavity of the push plate cylinder 4, an oil return port of the second reversing valve 3 is communicated with the hydraulic oil tank through an oil return pipeline, the first reversing valve 2 is arranged between the first pump body 1 and the second reversing valve 3, one end of the first pump body low-pressure overflow valve is connected to a pipeline between the first pump body 1 and the first reversing valve 2, the other end of the first pump body low-pressure overflow valve is communicated with the oil return pipeline, and the push plate cylinder 4 is unloaded with high-pressure oil before the second reversing valve 3 performs a reversing operation.
In the present embodiment, the first pump body 1 serves as a power transmission mechanism for hydraulic oil in the hydraulic system. In the process of advancing and compressing the push plate, the first pump body 1 is started, the first reversing valve 2 is opened from the flow direction channel from the first pump body 1 to the second reversing valve 3, the passage of the second reversing valve 3 to the rodless cavity of the push plate oil cylinder 4 is opened, the low-pressure overflow valve of the first pump body is closed, hydraulic oil conveyed by the first pump body 1 is conveyed through the main pressure oil way and sequentially enters the rodless cavity of the push plate oil cylinder 4 through the first reversing valve 2 and the second reversing valve 3, and the rodless cavity of the push plate oil cylinder 4 is increased in size, so that the rod cavity is compressed to push the push plate to advance rapidly to compress garbage. After the push plate is compressed in place, the second reversing valve 3 is closed, the low-pressure overflow valve of the first pump body is opened, pressure maintaining is carried out by high-pressure oil sealed between the second reversing valve 3 and the rodless cavity of the push plate oil cylinder 4, so that garbage is compacted, and at the moment, hydraulic oil conveyed by the first pump body 1 flows back to the hydraulic oil tank through the low-pressure overflow valve of the first pump body in an unloading mode. Before the second reversing valve 3 executes reversing operation, namely before a passage of the second reversing valve 3 leading to a rod cavity of the push plate cylinder 4 is opened to execute push plate recovery operation, a passage of a rodless cavity of the second reversing valve 3 and the push plate cylinder 4 is opened, a flow direction passage of the first reversing valve 2 from the second reversing valve 3 to the first pump body 1 is opened, high-pressure oil sealed between the second reversing valve 3 and the rodless cavity of the push plate cylinder 4 sequentially passes through the second reversing valve 3, the first reversing valve 2 and the first pump body low-pressure overflow valve to flow back into a hydraulic oil tank through an unloading oil return pipeline, and then push plate recovery operation is performed, so that the strong impact of a water hammer phenomenon is reduced, the occurrence of loosening and oil leakage of a pipeline joint and even pipeline damage is prevented, and the safety of an oil supply pipeline of the push plate cylinder 4 is greatly improved.
After high-pressure oil between the second reversing valve 3 and the rodless cavity of the push plate oil cylinder 4 is drained, the second reversing valve 3 executes reversing operation, a passage between the second reversing valve 3 and the rod cavity of the push plate oil cylinder 4 is opened, the first reversing valve 2 is opened from a flow direction channel from the first pump body 1 to the second reversing valve 3, a low-pressure overflow valve of the first pump body is closed, hydraulic oil conveyed by the first pump body 1 is used for the rod cavity of the push plate oil cylinder 4, the volume of the rod cavity of the push plate oil cylinder 4 is increased, and the rod cavity is compressed to push a push plate to be quickly recovered. Similarly, before the push plate oil cylinder 4 drives the push plate to compress the garbage again, the high-pressure oil unloading work with the same principle is executed, the high-pressure oil sealed between the second reversing valve 3 and the rod cavity of the push plate oil cylinder 4 is unloaded, and the water hammer phenomenon is prevented.
Referring to fig. 1, in a preferred embodiment of the present invention, the system further includes a selector valve 6 and a first pump body high-pressure overflow valve 7, an oil inlet of the selector valve 6 is connected to the main pressure oil path between the first pump body 1 and the first reversing valve 2, two oil outlets of the selector valve 6 are respectively connected to oil inlets of the first pump body low-pressure overflow valve and the first pump body high-pressure overflow valve 7, and oil outlets of the first pump body low-pressure overflow valve and the first pump body high-pressure overflow valve 7 are both communicated with the oil return line. The selector valve 6 is used for selecting the opening or closing of the first pump body low-pressure overflow valve and/or the first pump body high-pressure overflow valve 7. In the invention, the first pump body high-pressure overflow valve 7 plays a role in constant-pressure overflow and pressure-stabilizing protection of a main pressure oil path. In the process of forward compression of the push plate oil cylinder 4, the channel between the selection valve 6 and the first pump body high-pressure overflow valve 7 is opened, when the push plate oil cylinder 4 drives the push plate to perform powerful compression on garbage, when the main pressure oil way oil cylinder reaches a specific value, redundant hydraulic oil can be discharged through the first pump body high-pressure overflow valve 7, so that the maximum pressure of a main pressure pipeline is limited, and the effect of protecting a hydraulic system is achieved. In the process of solving the problem that the high-pressure oil in the rodless cavity of the second reversing valve 3 and the push plate oil cylinder 4 is unloaded by the first pump body high-pressure overflow valve 7 to solve the water hammer phenomenon of the push plate oil cylinder 4, the channel of the first pump body low-pressure overflow valve needs to be opened to unload the hydraulic oil.
As shown in fig. 1, in a preferred embodiment of the present invention, the system further includes a second pump body 8 and a check valve 9, the second pump body 8 connects the hydraulic oil tank and the line pressure oil path, and the check valve 9 is located between the second pump body 8 and the line pressure oil path. The second pump body 8 is mainly used for increasing the driving power of the hydraulic system and improving the working efficiency of the system, and comprises the efficiency of driving the push plate to stretch by the push plate oil cylinder 4 and the working efficiency of feeding and discharging by the feeding hopper oil cylinder 11. The check valve 9 is used for protecting the second pump body 8, and when the pressure in the main pressure oil circuit of the main hydraulic system is lower than the set value of the pressure reducing valve, oil liquid is prevented from flowing backwards, and the second pump body 8 is prevented from being damaged. Preferably, in this embodiment, the hydraulic oil pump is a dual pump, the dual pump is driven by the motor 16, the first pump body 1 and the second pump body 8 are components of the dual pump, and the dual pump supplies oil to the main pressure oil path at the same time, so as to supply oil to the push plate oil cylinder 4 and the below-described feeding hopper oil cylinder 11, thereby improving the oil supply efficiency, and further improving the working efficiency of the whole hydraulic unloading system.
In the preferred embodiment shown in fig. 1, the system further comprises a second pump body overflow valve 10, the second pump body overflow valve 10 is connected to the pipeline between the second pump body 8 and the check valve 9, and the second pump body overflow valve 10 is communicated with the oil return pipeline. The second pump body overflow valve 10 is opened when the hydraulic pressure in the main pressure oil path reaches the preset unloading pressure value of the second pump body 8, so that the hydraulic oil output by the second pump body 8 flows into the oil return pipeline through the second pump body overflow valve 10, is unloaded and returns to the hydraulic oil tank, and the hydraulic oil is conveyed only by using the first pump body 1, thereby preventing the motor 16 from being overloaded and damaging the driving motor 16.
Referring to fig. 1, in a preferred embodiment of the present invention, the system further includes a feeding hopper cylinder 11 and a third directional valve 12, the third directional valve 12 is connected to the main pressure oil path, two oil outlets of the third directional valve 12 are respectively connected to a rod chamber and a rodless chamber of the feeding hopper cylinder 11, the third directional valve 12 is further communicated to an oil return line, and before the third directional valve 12 performs a directional operation, the feeding hopper cylinder 11 is unloaded with high-pressure oil.
In the present embodiment, the first pump body 1 and/or the second pump body 8 serve as a power transmission mechanism for hydraulic oil in the hydraulic system. The feeding hopper cylinder 11 and the push plate cylinder 4 can use the same hydraulic circuit, so that the hydraulic pipeline can be simplified, and the use cost can be reduced. When the push plate cylinder 4 drives the push plate to compress, the third reversing valve 12 keeps a closed state, and the feeding hopper cylinder 11 does not participate in the work of the hydraulic unloading system. In the process that the feeding hopper cylinder 11 drives the feeding hopper to feed and discharge materials, the second reversing valve 3 keeps a closed state, the push plate cylinder 4 does not participate in the work of the hydraulic unloading system, and the work between the feeding hopper cylinder 11 and the push plate cylinder 4 is not affected. Preferably, the second reversing valve 3 and the third reversing valve 12 are both normally closed reversing valves, and the number of the joints of the reversing valves is ensured to be enough to ensure that the main pressure oil path, the oil return pipeline and the push plate cylinder 4 or the feeding hopper cylinder 11 are normally connected.
The hydraulic driving process of the feeding hopper oil cylinder 11 is the same as the driving process principle of the push plate oil cylinder 4. In the process of lifting the feeding hopper by the feeding hopper oil cylinder 11, the first pump body 1 is started, the first reversing valve 2 is opened by a flow direction channel from the first pump body 1 to the third reversing valve 12, a passage leading from the third reversing valve 12 to a rodless cavity of the feeding hopper oil cylinder 11 is opened, a low-pressure overflow valve of the first pump body is closed, hydraulic oil conveyed by the first pump body 1 is conveyed through a main pressure oil way and sequentially enters the rodless cavity of the feeding hopper oil cylinder 11 through the first reversing valve 2 and the third reversing valve 12, the rodless cavity of the feeding hopper oil cylinder 11 is increased in size, and the rod cavity is compressed to drive the feeding hopper to be quickly lifted to compress garbage. After the feeding hopper rises to a proper position, the third reversing valve 12 is closed, the low-pressure overflow valve of the first pump body is opened, pressure maintaining is carried out by high-pressure oil sealed between the third reversing valve 12 and the rodless cavity of the feeding hopper oil cylinder 11, so that garbage is compacted, and at the moment, hydraulic oil conveyed by the first pump body 1 flows back to the hydraulic oil tank through the low-pressure overflow valve of the first pump body in an unloading way. Before the third reversing valve 12 performs reversing operation, namely before a passage of the third reversing valve 12 to a rod cavity of the feeding hopper cylinder 11 is opened to perform feeding hopper recovery operation, a passage of the third reversing valve 12 and a rodless cavity of the feeding hopper cylinder 11 is opened, a flow direction passage of the first reversing valve 2 from the third reversing valve 12 to the first pump body 1 is opened, high-pressure oil sealed between the third reversing valve 12 and the rodless cavity of the feeding hopper cylinder 11 flows back to a hydraulic oil tank through an oil return pipeline after sequentially passing through the third reversing valve 12, the first reversing valve 2 and a low-pressure overflow valve of the first pump body for unloading, and then the feeding hopper recovery operation is performed, so that the strong impact of a water hammer phenomenon is reduced, the occurrence of loosening of a pipeline joint and even breakage of the oil leakage pipeline is prevented, and the safety of an oil supply pipeline of the feeding hopper cylinder 11 is greatly improved.
After high-pressure oil between the third reversing valve 12 and the rodless cavity of the feeding hopper oil cylinder 11 is drained, the third reversing valve 12 executes reversing operation, a passage between the third reversing valve 12 and the rod cavity of the feeding hopper oil cylinder 11 is opened, the first reversing valve 2 is opened by a flow channel from the first pump body 1 to the third reversing valve 12, a low-pressure overflow valve of the first pump body is closed, hydraulic oil conveyed by the first pump body 1 is used for carrying out the rod cavity of the feeding hopper oil cylinder 11, and the volume of the rod cavity of the feeding hopper oil cylinder 11 is increased, so that the rod cavity is compressed to drive the feeding hopper to be quickly recovered.
Similarly, in the process that the feeding hopper is driven by the feeding hopper oil cylinder 11 to ascend, the channel between the selection valve 6 and the first pump body high-pressure overflow valve 7 is opened, when the feeding hopper is loaded with a strong load, when the main pressure oil way oil cylinder reaches a specific value, redundant hydraulic oil can be discharged through the first pump body high-pressure overflow valve 7, so that the maximum pressure of a main pressure pipeline is limited, and the effect of protecting a hydraulic system is achieved. In the process of solving the problem that the high-pressure oil of the first pump body high-pressure overflow valve 7 unloads the high-pressure oil between the third reversing valve 12 and the rodless cavity of the feeding hopper and solving the water hammer phenomenon of the feeding hopper oil cylinder 11, the channel of the first pump body low-pressure overflow valve needs to be opened to unload the hydraulic oil. In the same way, the second pump body 8, the one-way valve 9 and the high-pressure overflow valve of the second pump body 8 have similar functions in the process of the push plate oil cylinder 4 and the feeding hopper oil cylinder 11.
As shown in fig. 1, as a preferred embodiment of the present invention, the system further includes a two-position two-way solenoid valve 13, and the two-position two-way solenoid valve 13 connects the rodless chamber of the upper hopper cylinder 11 with the third direction changing valve 12. In this embodiment, add two-position two way solenoid valve 13 between the rodless chamber of feeding funnel hydro-cylinder 11 and third switching-over valve 12, drive the feeding funnel decline in-process as feeding funnel hydro-cylinder 11, if the main pressure oil circuit pipeline takes place because internal pressure is too high or the pipeline is ageing to cause bursting, the operator only needs in time to let go of operating button, make two-position two way solenoid valve 13 close, two-position two way solenoid valve 13 can't run out with the hydraulic oil of feeding funnel hydro-cylinder 11 rodless intracavity, the feeding funnel just can in time stop to descend, prevent that the feeding funnel from damaging or staff from taking place danger, the security of property and life has been improved greatly.
As a preferred embodiment of the invention, the push plate oil cylinder 4 and the feeding hopper oil cylinder 11 are both gradient throttling type buffer oil cylinders. By adopting the gradual-change throttling type buffer oil cylinder, in the process that the push plate oil cylinder 4 is extended in place or retracted in place, under the action of a gradual-change throttling opening of a small cavity in the oil cylinder, the deceleration acceleration of the oil cylinder is gradually increased, and the movement speeds of the push plate oil cylinder 4 and the push plate are rapidly reduced, so that the impact of the push plate oil cylinder 4 on a hydraulic oil pipeline is reduced, the hard impact of the push plate is avoided, and the function of protecting the hydraulic pipeline and the rigid structure of the push plate is achieved. In the process that the feeding hopper oil cylinder 11 is going to rise or fall in place, under the action of a gradually-changed throttling opening of a small cavity in the oil cylinder, the deceleration acceleration of the oil cylinder is gradually increased, and the movement speeds of the push plate oil cylinder 4 and the push plate are rapidly reduced, so that the impact of the feeding hopper oil cylinder 11 on a hydraulic oil pipeline is reduced, the hard impact of the feeding hopper is avoided, and the effect of protecting the hydraulic pipeline and the rigid structure of the feeding hopper is achieved.
As a preferred embodiment of the present invention, the system further includes a pressure sensor 14, the pressure sensor 14 is disposed on the main pressure oil path, the pressure sensor 14 is used for detecting the oil pressure of the main pressure oil path, and a controller (not shown) is in control connection with the pressure sensor 14, the first direction changing valve 2, the second direction changing valve 3, the third direction changing valve 12 and the selector valve 6, respectively. The controller is used for controlling the on-off of the first reversing valve 2, the second reversing valve 3, the third reversing valve 12 and the selector valve 6, so that oil path selection can be conveniently carried out. Preferably, the controller presets the unloading pressure value of the second pump body 8 and the high pressure value of the main pressure oil path when the push plate oil cylinder 4 works, and the unloading pressure value of the second pump body 8 and the high pressure value of the main pressure oil path when the feeding hopper oil cylinder 11 works. When the push plate oil cylinder 4 works, the work comprises a process that the push plate oil cylinder 4 drives the push plate to compress garbage and recover the push plate, the pressure sensor 14 detects the pressure value in the main pressure oil path in real time and feeds the pressure value back to the controller, when the pressure value detected by the pressure sensor 14 reaches the unloading pressure value of the second pump body 8 preset in the controller, the controller orders to open the overflow valve 10 of the second pump body, so that the hydraulic oil output by the second pump body 8 flows into an oil return pipeline through the overflow valve 10 of the second pump body, the unloading returns to the hydraulic oil tank, at the moment, only the first pump body 1 is used for conveying the hydraulic oil, thereby preventing the motor 16 from overloading, causing damage to the driving motor 16, and simultaneously ensuring the compression efficiency. The push plate oil cylinder 4 continues to work under the oil supply of the first pump body 1, when the pressure sensor 14 detects that the pressure value in the main pressure oil path reaches a preset high pressure value in the controller, the situation that the push plate oil cylinder 4 extends in place or the garbage in the garbage bin is full is indicated at this moment, the oil supply for the push plate oil cylinder 4 is not needed to protect a hydraulic pipeline at this moment, the controller commands the second reversing valve 3 to close, the low-pressure overflow valve of the first pump body is opened, the pressure maintaining is carried out by the high-pressure oil sealed between the second reversing valve 3 and the rodless cavity of the push plate oil cylinder 4, the garbage is ensured to be compacted, and meanwhile, the hydraulic oil conveyed by the first pump body 1 flows back to the hydraulic oil tank through the.
Similarly, when the feeding hopper cylinder 11 works, the work includes a process that the feeding hopper cylinder 11 drives the feeding hopper to perform feeding and feeding hopper recovery, the pressure sensor 14 detects a pressure value in the main pressure oil path in real time and feeds the pressure value back to the controller, and when the pressure value detected by the pressure sensor 14 reaches an unloading pressure value of the second pump 8 preset in the controller, the controller commands to open the second pump overflow valve 10, so that hydraulic oil output by the second pump 8 flows into the oil return pipeline through the second pump overflow valve 10 and is unloaded back into the hydraulic oil tank, AT this time, only the first pump 1 is used for conveying the hydraulic oil, thereby preventing the motor 16 from being overloaded and damaging the driving motor 16, and improving the feeding efficiency.
Referring to the embodiment shown in fig. 1, the system further includes a position switch 15, the position switch 15 is connected to the controller, and the position switch 15 is disposed on a side of the feeding hopper cylinder 11 close to the feeding hopper. In the process that the feeding hopper cylinder 11 drives the feeding hopper to recover and descend, when the feeding hopper descends to the position switch 15 and detects a sensing signal, the position switch 15 sends the sensing signal to the controller, the controller commands the selection valve 6 to close the first pump high-pressure overflow valve 7 and open the first pump low-pressure overflow valve, so that the oil pressure in a main pressure oil path is reduced, the feeding hopper is used for low-pressure descent, the situation that the driving pressure is too high in the process that the feeding hopper descends and the compression box is displaced due to the fact that the stopping position of the feeding hopper is too high is avoided. In particular, the position switch 15 may be a proximity switch or a travel switch.
Referring to fig. 1, the second reversing valve 3 and the third reversing valve 12 are three-position four-way electromagnetic reversing valves or three-position four-way electro-hydraulic reversing valves, and the valve pipeline interfaces just meet the requirements of the hydraulic unloading system of the invention. Preferably, the second reversing valve 3 and the third reversing valve 12 are O-shaped normally closed reversing valves, and only valves needing to be opened are selected when the valve is used, so that the valve is convenient to use and high in pipeline safety performance. Specifically, the first directional valve 2 may be a two-position two-way electromagnetic directional valve, a two-position three-way electromagnetic directional valve, a two-position four-way electromagnetic directional valve, or the like, and the flow direction of the hydraulic oil between the first pump body 1 and the second directional valve 3 may be selected, and the selector valve 6 may be a three-position four-way H-type electromagnetic directional valve. The valves are all the existing mature products, and the specific power-on control mode is not repeated.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (9)
1. The unloading buffer hydraulic system is characterized by comprising a first pump body, a first reversing valve, a second reversing valve, a push plate oil cylinder, a selector valve, a first pump body high-pressure overflow valve and a first pump body low-pressure overflow valve, wherein the first pump body is communicated with a hydraulic oil tank and the second reversing valve through a main pressure oil path, the second reversing valve is an O-shaped normally-closed three-position four-way reversing valve, two oil outlets of the second reversing valve are respectively connected with a rod cavity and a rodless cavity of the push plate oil cylinder, an oil return port of the second reversing valve is communicated with the hydraulic oil tank through an oil return pipeline, the first reversing valve is arranged between the first pump body and the second reversing valve, the first reversing valve is a two-position two-way electromagnetic reversing valve, the first reversing valve is de-energized, the first reversing valve is communicated from a flow direction channel of the first pump body to the second reversing valve, the first reversing valve is energized, and the first reversing valve is conducted in two directions, the oil inlet of the selector valve is connected to a main pressure oil path between the first pump body and the first reversing valve, the selector valve is a three-position four-way H-shaped electromagnetic reversing valve, two oil outlets of the selector valve are respectively connected with oil inlets of a first pump body low-pressure overflow valve and a first pump body high-pressure overflow valve, oil outlets of the first pump body low-pressure overflow valve and the first pump body high-pressure overflow valve and an oil return port of the selector valve are communicated with an oil return pipeline, before the second reversing valve performs reversing operation, a passage between the second reversing valve and a rod-free cavity of the push plate oil cylinder is opened, a flow direction passage from the second reversing valve to the first pump body is opened, and the push plate oil cylinder performs high-pressure oil unloading.
2. The unloading buffer hydraulic system according to claim 1, further comprising a second pump body connecting the hydraulic oil tank and the line pressure oil passage, and a check valve between the second pump body and the line pressure oil passage.
3. An unloading buffer hydraulic system according to claim 2, wherein the system further comprises a second pump body overflow valve connected to a pipe between the second pump body and the check valve, the second pump body overflow valve being in communication with the oil return line.
4. The unloading buffer hydraulic system of claim 2, wherein the first and second pump bodies are part of a tandem pump.
5. An unloading buffer hydraulic system according to claim 1, wherein the system further comprises a feeding hopper cylinder and a third directional valve, the third directional valve is connected with the main pressure oil path, two oil outlets of the third directional valve are respectively connected with a rod cavity and a rodless cavity of the feeding hopper cylinder, the third directional valve is further communicated with an oil return pipeline, and the feeding hopper cylinder is unloaded with high-pressure oil before the third directional valve performs the reversing operation.
6. An unloading buffer hydraulic system according to claim 5, further comprising a two-position two-way solenoid valve connecting the rodless chamber of the upper hopper cylinder with the third directional valve.
7. An unloading buffer hydraulic system according to claim 5, wherein the push plate cylinder and the loading hopper cylinder are both gradient throttling buffer cylinders.
8. The unloading buffer hydraulic system according to claim 5, further comprising a pressure sensor disposed on the main pressure oil line, the pressure sensor being configured to detect an oil pressure of the main pressure oil line, and a controller in control connection with the pressure sensor, the first directional valve, the second directional valve, the third directional valve, and the selector valve, respectively.
9. An unloading buffer hydraulic system according to claim 8, further comprising a position switch connected to the controller, the position switch being disposed on a side of the loading hopper cylinder adjacent to the loading hopper.
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| CN201810860823.XA CN109058187B (en) | 2018-08-01 | 2018-08-01 | Unloading buffer hydraulic system |
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| CN201810860823.XA CN109058187B (en) | 2018-08-01 | 2018-08-01 | Unloading buffer hydraulic system |
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| CN109058187A CN109058187A (en) | 2018-12-21 |
| CN109058187B true CN109058187B (en) | 2020-07-10 |
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| CN111365310A (en) * | 2020-02-25 | 2020-07-03 | 孙梅 | Hydraulic unloading system |
| CN112324754A (en) * | 2020-11-18 | 2021-02-05 | 湖北绿智精工科技有限公司 | Automatic control reversing impact eliminating device for compression system of garbage station |
| CN113417907A (en) * | 2021-05-14 | 2021-09-21 | 天津市天锻压力机有限公司 | Auxiliary oil way pressure relief system for handling internal residual pressure of quick-insertion device and allowing plugging and unplugging |
| CN115059720B (en) * | 2022-05-13 | 2023-07-04 | 江苏徐工工程机械研究院有限公司 | Rear suspension vibration buffer control system of tractor and tractor |
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| DE4208755A1 (en) * | 1992-03-19 | 1993-09-23 | Schwing Gmbh F | HYDRAULIC SLIDER CONTROL FOR WORK CYLINDERS WITH UNEQUALIZED PISTON SPEEDS |
| KR100696976B1 (en) * | 2002-05-24 | 2007-03-20 | 메트소 린데만 게엠베하 | Hydraulic control in a hydraulic system, especially for the operation of scrap cutters |
| CN201419666Y (en) * | 2009-06-15 | 2010-03-10 | 福建龙马环卫装备股份有限公司 | Excrement collecting and transferring vehicle for breeding industries |
| CN103434393B (en) * | 2013-08-13 | 2015-09-02 | 福建龙马环卫装备股份有限公司 | Small-sized all-hydraulic-driven road sweeper vibration hydraulic system |
| CN204312689U (en) * | 2014-11-18 | 2015-05-06 | 广州汽车集团股份有限公司 | The shifting control system of automatic transmission |
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| CN205136180U (en) * | 2015-11-13 | 2016-04-06 | 福建龙马环卫装备股份有限公司 | Hydraulic system of big indisputable fill compression dustbin compression material loading simultaneous working |
| CN106151500B (en) * | 2016-09-26 | 2018-02-13 | 安徽江淮汽车集团股份有限公司 | Gear box hydraulic control system |
| CN207246143U (en) * | 2017-08-28 | 2018-04-17 | 福建龙马环卫装备股份有限公司 | A kind of refuse compaction equipment double-power hydraulic pumping plant system |
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