Buffer damping hydraulic system and servo hydraulic test bed
By installing a buffer and damping hydraulic system on the movable beam or return cylinder of the servo hydraulic test bench, the serious vibration problem when the test part is broken is solved, and the stable operation and safe use of the test bench is achieved.
Patent Information
- Application Number
- CN202411935073.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-04-01
AI Technical Summary
When the test piece of the existing servo hydraulic test bench breaks, the reciprocating movement of the movable beam and the return cylinder will cause serious vibration, resulting in damage to the test bench.
A buffer-damping hydraulic system is adopted, which includes a check-in valve, a cut-off reversing device, an accumulator, a pressure detector and a controller. Through the coordinated work of these components, it absorbs and relieves hydraulic energy and reduces vibration.
It effectively reduces the reciprocating vibration of the movable beam or return cylinder, improves the safety and service life of the test bench, and ensures the stable operation of the test bench during the test.
Smart Images
Figure CN119737347A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of hydraulic equipment, and in particular to a buffer damping hydraulic system and a servo hydraulic test bench. Background Art
[0002] With the development of science and technology, people are pursuing a deeper understanding of deep geological research and higher demands for the safety of buildings. The requirements for the operating stability and accuracy of servo hydraulic test benches such as test benches for deep geological simulation and simulated vibration test benches required for super high-rise buildings are also getting higher and higher. At present, the above two test benches are mostly test benches in the form of loading frame and actuator pressurization. Most of the loading frames use a movable beam to lift the test piece onto the loading platform. The lifting cylinder is connected to the movable beam to control the lifting action of the movable beam. Then the actuator pressurizes the test piece. During the forging process of the hydraulic press, the rod end of the working cylinder is connected to the movable beam to hydraulically drive the movable beam to perform various work tasks, such as pushing, pulling, and compressing. The working cylinder is connected to the return cylinder. The return cylinder can pull the piston rod back to the starting position after the working cylinder completes the work, realizing the reset function of the system, that is, the return cylinder can indirectly provide a balancing force for the movable beam to balance the movable beam. However, during the simulated pressure test, once the test piece (such as a plate strip) is broken, the tension of the loading frame during the test is released, and the movable crossbeam instantly retracts, causing the movable crossbeam lifting cylinder to retract, and its plug cavity is passively compressed, and the hydraulic oil pressure increases, causing the retracted movable crossbeam to re-extend. The movable crossbeam needs to retract and extend multiple times to reduce the oil pressure in the lifting cylinder before stopping, and the reciprocating motion of the movable crossbeam will produce severe vibration. When the forging hydraulic press is under working conditions such as tensile or extrusion of the test piece, the sudden breakage of the test piece will also cause the working cylinder in the hydraulic press to suddenly lose load, and the return cylinder connected to the working cylinder will be instantly compressed and quickly retracted, generating huge vibrations. Both of the above vibrations will cause damage to the test bench. Summary of the invention
[0003] The problem solved by the invention is how to improve the running stability and safety of the test bench.
[0004] In order to solve the above problems, the present invention provides a buffer damping hydraulic system and a servo hydraulic test bench
[0005] In the first aspect, the present invention provides a buffer damping hydraulic system, which is applied to a movable crossbeam lifting cylinder or a return cylinder in a servo hydraulic test bench, and is characterized in that it includes a one-way valve, a cut-off reversing device, an accumulator, a first pressure detector and a controller, the oil inlet of the one-way valve is connected to the plug chamber of the lifting cylinder or the return cylinder, the oil outlet of the one-way valve is connected to the oil inlet of the cut-off reversing device, the energy storage oil outlet of the cut-off reversing device is connected to the accumulator, the pressure relief oil outlet of the cut-off reversing device is used to be connected to an oil tank, the first pressure detector is connected to the accumulator, and the controller is electrically connected to the first pressure detector and the cut-off reversing device, respectively.
[0006] Optionally, the buffer damping hydraulic system also includes an oil replenishing device, the oil outlet end of the oil replenishing device is respectively connected to the plug chamber of the lifting cylinder and the rod chamber of the lifting cylinder or the return cylinder, and the oil inlet end of the oil replenishing device is used to connect to the oil tank.
[0007] Optionally, when applied to a movable crossbeam lifting cylinder in a servo hydraulic test bench, the buffer damping hydraulic system also includes a pilot solenoid switch valve, a plug-side throttling cartridge valve and a rod-side throttling cartridge valve, the pilot solenoid switch valve is respectively connected to the plug-side throttling cartridge valve and the rod-side throttling cartridge valve, and is electrically connected to the controller, the plug-side throttling cartridge valve is connected to one end of the rod-side throttling cartridge valve, and the other end of the rod-side throttling cartridge valve is connected to the rod chamber of the lifting cylinder.
[0008] Optionally, the buffer damping hydraulic system also includes a speed sensor, which is used to be arranged on the movable crossbeam to obtain the lifting speed of the movable crossbeam. The speed sensor is electrically connected to the controller, and the pilot solenoid switch valve and / or the oil replenishing device are electrically connected to the controller.
[0009] Optionally, the buffer damping hydraulic system also includes a plug-side electromagnetic switch valve, which is connected between the oil inlet of the one-way valve and the plug chamber of the lifting cylinder or the return cylinder, and the plug-side electromagnetic switch valve is connected to the controller.
[0010] Optionally, the buffer damping hydraulic system further comprises a second overflow valve, which is connected between the rod-side throttle cartridge valve and the rod chamber of the lifting cylinder and is used to be connected to the oil tank.
[0011] Optionally, the buffer damping hydraulic system also includes a second pressure detector, which is connected between the oil inlet of the one-way valve and the plug chamber of the lifting cylinder or the return cylinder, and is electrically connected to the controller.
[0012] Optionally, the buffer damping hydraulic system further includes a first overflow valve, which is connected between the oil inlet of the one-way valve, the second pressure detector and the oil tank, and is electrically connected to the controller.
[0013] Optionally, the accumulator is a bladder accumulator or a piston accumulator.
[0014] In a second aspect, the present invention provides a servo hydraulic test bench, comprising the buffer damping hydraulic system as described above.
[0015] The beneficial effects of the buffer damping hydraulic system and servo hydraulic test bench of the present invention are: during the operation of the test bench, that is, during the normal rise, fall and stop of the movable crossbeam, the buffer damping hydraulic system of this embodiment may not be installed on the lifting cylinder or the return cylinder first, so as to avoid erroneous judgment during the debugging state of the test bench. After the debugging process of the test bench is completed and before the model test, the lifting cylinder and the return cylinder are filled with oil of a certain pressure value to ensure the normal operation of the test bench, and the buffer damping hydraulic system of this embodiment is connected to the lifting cylinder or the return cylinder. The test bench starts the test. Once the test piece breaks, the movable crossbeam instantly retracts, causing the lifting cylinder or the working cylinder to lose load. The working cylinder loss of load then causes the return load to lose load. The rod chamber volume of the lifting cylinder increases, the pressure of the oil in the rod chamber decreases, the plug chamber volume of the lifting cylinder decreases, and the pressure of the oil in the plug chamber increases. Similarly, the volume of the return cylinder (usually the plunger cylinder) decreases, and the pressure of the oil increases. At this time, the higher hydraulic pressure will squeeze the oil from the plug chamber of the lifting cylinder or the return cylinder into the buffer damping hydraulic system, and the high-pressure oil will pass through the one-way valve and the cut-off reversing device in turn and enter the accumulator to store the high-pressure oil for reuse. At the same time, the accumulator absorbs the high-pressure oil for the first time, and also discharges the high-pressure oil in the lifting cylinder or the return cylinder to achieve timely pressure relief, which can make the vibration quickly decay to an acceptable range in a very short time, reduce the reciprocating vibration of the movable crossbeam or the return cylinder, and thus improve the safety and service life of the test bench. At the same time, the accumulator has a fast reaction speed and will absorb the pressurized hydraulic oil in the plug chamber in the first time to achieve the effect of instantaneous pressure relief. A first pressure detector is set on the accumulator, and a controller is set to be connected to the first pressure detector and the cut-off reversing device respectively. The first pressure detector detects the pressure value in the accumulator in real time and sends it to the controller to monitor the condition of the accumulator. For example, when the pressure value sent by the first pressure detector received by the controller is greater than the set pressure value of the accumulator (which can be determined according to parameters such as the accumulator volume, where the set pressure value is less than the maximum pressure value of the accumulator to ensure the safe use of the accumulator), indicating that the storage capacity of the accumulator has reached the upper limit, the cut-off reversing device is controlled to reverse, the oil outlet connected to the accumulator is closed, and the oil outlet connected to the oil tank is opened to drain the oil to avoid damage to the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The structure diagram of the buffer damping hydraulic system of the embodiment of the present invention when it is installed on the lifting cylinder Figure 1 ;
[0017] Figure 2 It is a structural schematic diagram of the buffer damping hydraulic system of an embodiment of the present invention when it is installed on the return cylinder;
[0018] Figure 3 The structure diagram of the buffer damping hydraulic system of the embodiment of the present invention when it is installed on the lifting cylinder Figure 2 .
[0019] Description of reference numerals:
[0020] 1-lifting cylinder, 2-return cylinder, 3-check valve, 4-cut-off reversing device, 5-accumulator, 6-first pressure detector, 7-oil replenishing device, 8-oil tank, 9-second pressure detector, 10-first overflow valve, 11-plug side solenoid switch valve, 12-pilot solenoid switch valve, 13-plug side throttling cartridge valve, 14-rod side throttling cartridge valve, 15-second overflow valve; 16-working cylinder. DETAILED DESCRIPTION
[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.
[0022] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0023] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".
[0024] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a buffer damping hydraulic system and a servo hydraulic test bench.
[0025] like Figure 1 and Figure 2 As shown, a buffer damping hydraulic system provided by an embodiment of the present invention is applied to a movable crossbeam lifting cylinder 1 or a return cylinder 2 in a servo hydraulic test bench, and includes a one-way valve 3, a cut-off reversing device 4, an accumulator 5, a first pressure detector 6 and a controller, wherein the oil inlet of the one-way valve 3 is connected to the plug chamber of the lifting cylinder 1 or the return cylinder 2, the oil outlet of the one-way valve 3 is connected to the oil inlet of the cut-off reversing device 4, the energy storage oil outlet of the cut-off reversing device 4 is connected to the accumulator 5, the pressure relief oil outlet of the cut-off reversing device 4 is used to be connected to an oil tank 8, the first pressure detector 6 is connected to the accumulator 5, and the controller is electrically connected to the first pressure detector 6 and the cut-off reversing device 4, respectively.
[0026] Specifically, the buffer and damping hydraulic systems can be provided with one or two sets. One set of buffer and damping hydraulic systems can be separately connected to the lifting cylinder 1 or the return cylinder 2 of the movable crossbeam to relieve the pressure of the oil in the lifting cylinder 1 or the return cylinder 2, thereby reducing the movement stability of the movable crossbeam or the return cylinder 2 when the test piece suddenly breaks. The two sets of buffer and damping hydraulic systems can also be respectively connected to the lifting cylinder 1 and the return cylinder 2, and the oil pressure can be relieved from the lifting cylinder 1 and the return cylinder 2 at the same time, thereby reducing the reciprocating motion of the movable crossbeam and the return cylinder 2 when the test piece suddenly breaks, thereby further ensuring the operation stability of the equipment.
[0027] During the operation of the debugging test bench, that is, during the normal rise, fall and stop of the movable crossbeam, the buffer damping hydraulic system of this embodiment may not be installed on the lifting cylinder 1 or the return cylinder 2 to avoid misjudgment during the debugging of the test bench. After the debugging process of the test bench is completed and before the model test, the lifting cylinder 1 and the return cylinder 2 are filled with oil of a certain pressure value to ensure the normal operation of the test bench, and the buffer damping hydraulic system of this embodiment is connected to the lifting cylinder 1 or the return cylinder 2. The test bench starts the test. Once the test piece breaks, the movable crossbeam shrinks instantly, causing the lifting cylinder 1 or the working cylinder 16 to lose load. The loss of load of the working cylinder 16 leads to the loss of load of the return cylinder 2, wherein the volume of the rod chamber of the lifting cylinder 1 increases, and the pressure of the oil in the rod chamber decreases, the volume of the plug chamber of the lifting cylinder 1 decreases, and the pressure of the oil in the plug chamber increases. Similarly, the volume of the return cylinder 2 (usually the plunger cylinder) decreases, wherein the pressure of the oil decreases, the volume of the plug chamber of the return cylinder 2 decreases, and the pressure of the oil in the plug chamber increases. At this time, the higher hydraulic pressure will squeeze the oil from the plug chamber of the lifting cylinder 1 or the plug chamber of the return cylinder 2 into the buffer damping hydraulic system, such as Figure 1 and Figure 2 As shown, the high-pressure oil will pass through the one-way valve 3 and the cut-off reversing device 4 in sequence and enter the accumulator 5, where the high-pressure oil is stored for easy reuse. At the same time, the accumulator 5 absorbs the high-pressure oil as soon as possible and discharges the high-pressure oil in the lifting cylinder 1 or the return cylinder 2 to achieve timely pressure relief, which can make the vibration decay quickly to an acceptable range in a very short time, reduce the reciprocating vibration of the movable crossbeam or the return cylinder 2, and thus improve the safety and service life of the test bench. At the same time, the accumulator 5 has a fast reaction speed and will absorb the boosted hydraulic oil in the plug chamber as soon as possible to achieve the effect of instantaneous pressure relief. A first pressure detector 6 is arranged on the accumulator 5, and a controller is arranged to be connected with the first pressure detector 6 and the cut-off reversing device 4 respectively. The first pressure detector 6 detects the pressure value in the accumulator 5 in real time and sends it to the controller to monitor the condition of the accumulator 5. For example, when the pressure value sent by the first pressure detector 6 received by the controller is greater than the set pressure value of the accumulator 5 (which can be determined according to parameters such as the volume of the accumulator 5, wherein the set pressure value is less than the maximum pressure value of the accumulator 5 to ensure the safe use of the accumulator 5), indicating that the storage capacity of the accumulator 5 has reached the upper limit, the cut-off reversing device 4 is controlled to reverse, the oil outlet connected to the accumulator 5 is closed, and the oil outlet connected to the oil tank 8 is opened to drain the oil to avoid damage to the accumulator 5.
[0028] Optionally, the buffer damping hydraulic system also includes an oil replenishing device 7, the oil outlet end of the oil replenishing device 7 is respectively connected to the plug chamber of the lifting cylinder 1 and the rod chamber of the lifting cylinder 1 or the return cylinder 2, and the oil inlet end of the oil replenishing device 7 is used to connect to the oil tank 8.
[0029] Specifically, Figures 1 to 3As shown, before the test bench test, when the hydraulic press is stopped, the oil replenishing device 7 is used to provide a certain pressure of oil to the lifting cylinder 1 or the return cylinder 2 to ensure the normal operation of the lifting cylinder 1 or the return cylinder 2. Figure 1 The P port of the oil replenishing device 7 in the oil filling device is connected to the oil tank 8. Generally speaking, an oil pump is arranged between the oil replenishing device 7 and the oil tank 8. The oil pump draws oil from the oil tank 8 and transports it to the oil replenishing device 7. The pressure of the oil after being pumped out by the oil pump increases, and the pressure is greater than the pressure of the oil required for the operation of the lifting cylinder 1. Therefore, a pressure reducing valve can be arranged in the oil replenishing device 7. After the oil passes through the pressure reducing valve, the oil is transported to the plug chamber of the lifting cylinder 1 and the rod chamber of the lifting cylinder 1 or the return cylinder 2 through the oil outlet end, and the oil transported by the oil pump is reduced in pressure so that the oil pressure reaches the pressure required for the operation of the lifting cylinder 1, and the plug chamber of the lifting cylinder 1 and the rod chamber of the lifting cylinder 1 or the return cylinder 2 are pre-charged with a certain pressure.
[0030] In addition, when the buffer damping hydraulic system of this embodiment is installed on the lifting cylinder 1, when the test piece breaks, the volume of the plug cavity of the lifting cylinder 1 becomes smaller, and the oil therein is discharged into the accumulator 5 through the one-way valve 3 and the cut-off reversing device 4 for pressure relief. The volume of the rod cavity of the lifting cylinder 1 increases, and the oil pressure therein decreases, but the volume change of the oil in the rod cavity of the lifting cylinder 1 is small. In order to avoid the vacuum phenomenon caused by the instantaneous increase in the volume of the rod cavity, the oil replenishing device 7 adjusts the oil outlet end (such as Figure 1 and Figure 3 The pressure of the oil output from the A port of the oil replenishing device 7 in the rod chamber is used to replenish the low-pressure oil into the rod chamber of the lifting cylinder 1 to fill the sudden change in volume and prevent the lifting cylinder from reciprocating due to the pressure difference between the oil in the plug chamber and the rod chamber. It should be noted that the oil replenishing device 7 can be operated manually or connected to a controller for automatic operation. For example, a displacement sensor is provided, and the displacement sensor and the oil replenishing device 7 are respectively connected to the controller. The displacement sensor detects the displacement and speed of the movable crossbeam in real time and transmits it to the controller. The controller determines whether the test piece is broken based on the real-time displacement and speed. If so, the oil replenishing device 7 is controlled to stop replenishing oil to the plug chamber of the lifting cylinder 1, and reduce the pressure of the oil output from the oil outlet of the oil replenishing device 7 to output low-pressure oil to the rod chamber of the lifting cylinder 1.
[0031] Optionally, when applied to a movable crossbeam lifting cylinder 1 in a servo hydraulic test bench, the buffer damping hydraulic system also includes a pilot solenoid switch valve 12, a plug-side throttle cartridge valve 13 and a rod-side throttle cartridge valve 14. The pilot solenoid switch valve 12 is respectively connected to the plug-side throttle cartridge valve 13 and the rod-side throttle cartridge valve 14, and is electrically connected to the controller, the plug-side throttle cartridge valve 13 is connected to one end of the rod-side throttle cartridge valve 14, and the other end of the rod-side throttle cartridge valve 14 is connected to the rod chamber of the lifting cylinder 1.
[0032] Specifically, Figure 1 As shown, a plug-side throttling cartridge valve 13 is provided in the plug cavity of the lifting cylinder 1, and a rod-side throttling cartridge valve 14 is provided in the rod cavity of the lifting cylinder 1. The specific connection method is: one end of the plug-side throttling cartridge valve 13 is connected to the plug cavity of the lifting cylinder 1, and the other end is connected to one end of the rod-side throttling cartridge valve 14, and the other end of the rod-side throttling cartridge valve 14 is connected to the rod cavity of the lifting cylinder 1. When the test piece is broken, part of the high-pressure oil in the plug cavity flows through the one-way valve 3 and the cut-off reversing device 4 in sequence into the accumulator 5, and part of it flows through the plug-side throttling cartridge valve 13 and the rod-side throttling cartridge valve 14 in sequence into the rod cavity of the lifting cylinder 1, filling the vacuum caused by the sudden increase in volume in the rod cavity, further increasing the stability and safety of the test bench operation. Among them, the plug-side throttling cartridge valve 13 and the rod-side throttling cartridge valve 14 can adjust the opening degree of the cartridge valve through the cartridge valve adjusting rod to achieve throttling damping vibration reduction, which helps to attenuate the oscillation capacity.
[0033] Specifically, in order to achieve controllability of the rod chamber oil filling, a pilot electromagnetic switch valve 12 is provided to be connected to the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14, respectively, and is electrically connected to the controller, and is used to be powered on or off according to the instructions of the controller to connect or disconnect the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14. When the test bench is debugged normally, the controller controls the pilot electromagnetic switch valve 12 to be powered off, so that the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14 are in a disconnected state. When the test bench is tested, the controller controls the pilot electromagnetic switch valve 12 to be powered on, and the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14 are connected. When the test piece is broken, the high-pressure oil in the plug chamber of the lifting cylinder 1 is depressurized and transported through the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14. In this embodiment, high-pressure oil is replenished to the rod side of the lifting cylinder 1 through the plug-side throttle cartridge valve 13 and the rod-side throttle cartridge valve 14, and when the oil discharged from the plug chamber of the lifting cylinder 1 is sufficient to fill the vacuum of the rod chamber, the oil replenishing device 7 stops running after the plug-side throttle cartridge valve 13 and the rod-side throttle cartridge valve 14 are opened.
[0034] It should be noted that the pilot solenoid switch valve 12, the plug-side throttle cartridge valve 13 and the rod-side throttle cartridge valve 14 are only used when the buffer damping hydraulic system is connected to the lifting cylinder 1, and the pilot solenoid switch valve 12 can be manually operated or connected to the controller for automatic operation.
[0035] Optionally, the buffer damping hydraulic system also includes a speed sensor, which is used to be arranged on the movable crossbeam to obtain the lifting and lowering speed of the movable crossbeam. The speed sensor is electrically connected to the controller, and the pilot solenoid switch valve 12 and / or the oil replenishing device 7 are electrically connected to the controller.
[0036] Specifically, a speed sensor is provided on the movable crossbeam and is electrically connected to the controller, so that the lifting speed of the movable crossbeam can be obtained in real time and sent to the controller. The controller can judge whether the test piece is broken according to the preset abnormal speed of the movable crossbeam (i.e., the speed at which the movable crossbeam moves when the test piece is broken) and the received lifting speed. If so, the pilot electromagnetic switch valve 12 and / or the oil replenishing device 7 electrically connected thereto are controlled to act according to the preset operation, so as to effectively avoid monitoring the operation of the test bench and avoid erroneous judgment. Figure 1 and Figure 2 As shown, the specific process is as follows: when the test bench is being debugged or the test bench is operating normally, the movable crossbeam is operating normally, and the lifting speed of the movable crossbeam obtained by the speed sensor is always less than the abnormal speed of the movable crossbeam, then the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14 do not need to operate at this time, then the controller controls the pilot electromagnetic switch valve 12 to disconnect to close the plug side throttle cartridge valve 13 and the rod side throttle cartridge valve 14, and before the test bench operates normally, the controller controls the oil replenishment device 7 to deliver a certain pressure of oil to the plug chamber, rod chamber or return cylinder 2 of the lifting cylinder 1 to ensure the normal operation of the test bench; when the test piece suddenly breaks, the movable crossbeam obtained by the speed sensor When the instantaneous speed of the beam is greater than the abnormal speed of the movable crossbeam, the controller controls the pilot electromagnetic switch valve 12 to be connected to open the plug-side throttling cartridge valve 13 and the rod-side throttling cartridge valve 14, so that the high-pressure oil in the plug chamber of the lifting cylinder 1 flows into the rod chamber after throttling to fill the vacuum volume, and controls the oil replenishing device 7 to stop replenishing oil to the plug chamber of the lifting cylinder 1, and / or opens the third oil outlet and the second oil outlet of the oil replenishing device 7 to discharge oil. At this time, whether the oil replenishing device 7 replenishes oil to the rod chamber of the lifting cylinder 1 needs to be set according to parameters such as the volume of the lifting cylinder 1, the throttling capacity of the plug-side throttling cartridge valve 13 and the rod-side throttling cartridge valve 14, and the volume of the accumulator 5 in actual applications.
[0037] Optionally, the buffer damping hydraulic system also includes a plug-side electromagnetic switch valve 11, which is connected between the oil inlet of the one-way valve 3 and the plug chamber of the lifting cylinder 1 or the return cylinder 2, and the plug-side electromagnetic switch valve 11 is connected to the controller.
[0038] Specifically, Figure 1 and Figure 2As shown, during the normal test of the test bench, if the movable crossbeam has a large displacement, it may cause the plug chamber of the lifting cylinder 1 or the return cylinder 2 to deviate from the telescopic change during normal operation. At this time, the accumulator 5 may relieve the pressure of the plug chamber of the lifting cylinder 1 or the return cylinder 2, affecting the normal operation of the test bench. Therefore, a plug-side electromagnetic switch valve 11 is arranged between the oil inlet of the one-way valve 3 and the plug chamber of the lifting cylinder 1 or the return cylinder 2. When the test bench is debugged, the plug-side electromagnetic switch valve 11 is in an isolated state to avoid misjudgment and pressure relief that affects the normal operation of the test bench. When the test bench is operating normally, the plug-side electromagnetic switch valve 11 is in a connected state, so that when the test piece suddenly breaks, the one-way valve 3, the cut-off reversing device 4 and the accumulator 5 can be used to relieve pressure in time.
[0039] Optionally, the buffer damping hydraulic system further includes a second overflow valve 15 , which is connected between the rod-side throttle cartridge valve 14 and the rod chamber of the lifting cylinder 1 and is used to be connected to the oil tank 8 .
[0040] Specifically, Figure 1 As shown, a second relief valve 15 is provided between the oil outlet end of the rod-side throttle cartridge valve 14 and the rod chamber of the lifting cylinder 1 and is connected to the oil tank 8 to discharge excess oil through the second relief valve 15 into the oil tank 8 for unloading.
[0041] Optionally, the buffer damping hydraulic system also includes a second pressure detector 9, which is connected between the oil inlet of the one-way valve 3 and the plug chamber of the lifting cylinder 1 or the return cylinder 2, and is electrically connected to the controller.
[0042] Specifically, Figure 1 and Figure 2 As shown, a second pressure detector 9 is provided between the oil inlet of the one-way valve 3 and the plug cavity of the lifting cylinder 1 or the return cylinder 2 to monitor the oil pressure in the oil circuit in real time and feed it back to the controller electrically connected thereto, so as to monitor the safety of the oil circuit pressure. In addition, the controller can be connected to an alarm. When the controller determines that the second pressure detector 9 detects that the oil circuit pressure value is greater than the maximum withstand pressure (the maximum pressure that the oil circuit can withstand), the alarm is controlled to sound an alarm, prompting the operator to handle the problem, so as to ensure the safe operation of the test bench.
[0043] Optionally, the buffer damping hydraulic system further includes a first overflow valve 10, which is connected between the oil inlet of the one-way valve 3, the second pressure detector 9 and the oil tank 8, and is electrically connected to the controller.
[0044] Specifically, Figure 1 and Figure 2As shown, a first relief valve 10 is provided between the oil inlet of the one-way valve 3, the second pressure detector 9 and the oil tank 8. While the accumulator 5 unloads and stores the high-pressure oil, the first relief valve 10 also discharges the high-pressure oil into the oil tank 8 for unloading and storage, so as to achieve rapid pressure relief and restore the movable crossbeam to a stable state as soon as possible.
[0045] Optionally, the accumulator 5 is a bladder accumulator or a piston accumulator.
[0046] A servo hydraulic test bench provided in an embodiment of the present invention includes the buffer damping hydraulic system as described above.
[0047] The beneficial effects of the servo hydraulic test bench of this embodiment relative to the prior art are the same as those of the above-mentioned buffer damping hydraulic system, which will not be described in detail here.
[0048] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.
Claims
1. A buffer damping hydraulic system, applied to a movable crossbeam lifting cylinder (1) or a return cylinder (2) in a servo hydraulic test bench, characterized in that: The invention comprises a one-way valve (3), a cut-off reversing device (4), an accumulator (5), a first pressure detector (6) and a controller, wherein the oil inlet of the one-way valve (3) is connected to the plug chamber of the lifting cylinder (1) or the return cylinder (2), the oil outlet of the one-way valve (3) is connected to the oil inlet of the cut-off reversing device (4), the energy storage oil outlet of the cut-off reversing device (4) is connected to the accumulator (5), the pressure relief oil outlet of the cut-off reversing device (4) is used to be connected to an oil tank (8), the first pressure detector (6) is connected to the accumulator (5), and the controller is electrically connected to the first pressure detector (6) and the cut-off reversing device (4), respectively.
2. The buffer damping hydraulic system according to claim 1, characterized in that: It also includes an oil replenishing device (7), the oil outlet end of the oil replenishing device (7) is respectively connected to the plug chamber of the lifting cylinder (1) and the rod chamber of the lifting cylinder (1) or the return cylinder (2), and the oil inlet end of the oil replenishing device (7) is used to connect to the oil tank (8).
3. The buffer damping hydraulic system according to claim 2, characterized in that: When applied to a movable crossbeam lifting cylinder (1) in a servo hydraulic test bench, the buffer damping hydraulic system further comprises a pilot electromagnetic switch valve (12), a plug-side throttling cartridge valve (13) and a rod-side throttling cartridge valve (14); the pilot electromagnetic switch valve (12) is respectively connected to the plug-side throttling cartridge valve (13) and the rod-side throttling cartridge valve (14), and is electrically connected to the controller; one end of the plug-side throttling cartridge valve (13) is connected to one end of the rod-side throttling cartridge valve (14), and the other end of the rod-side throttling cartridge valve (14) is connected to the rod chamber of the lifting cylinder (1).
4. The buffer damping hydraulic system according to claim 3, characterized in that: It also includes a speed sensor, which is used to be arranged on the movable crossbeam to obtain the lifting speed of the movable crossbeam. The speed sensor is electrically connected to the controller, and the pilot electromagnetic switch valve (12) and / or the oil replenishing device (7) are electrically connected to the controller.
5. The buffer damping hydraulic system according to claim 4, characterized in that: It also includes a plug-side electromagnetic switch valve (11), which is connected between the oil inlet of the one-way valve (3) and the plug chamber of the lifting cylinder (1) or the return cylinder (2), and the plug-side electromagnetic switch valve (11) is connected to the controller.
6. The buffer damping hydraulic system according to claim 3, characterized in that: It also includes a second overflow valve (15), which is connected between the rod-side throttle cartridge valve (14) and the rod chamber of the lifting cylinder (1) and is used to connect to the oil tank (8).
7. The buffer damping hydraulic system according to claim 1, characterized in that: It also includes a second pressure detector (9), which is connected between the oil inlet of the one-way valve (3) and the plug chamber of the lifting cylinder (1) or the return cylinder (2), and is electrically connected to the controller.
8. The buffer damping hydraulic system according to claim 7, characterized in that: It also includes a first overflow valve (10), which is connected between the oil inlet of the one-way valve (3), the second pressure detector (9) and the oil tank (8), and is electrically connected to the controller.
9. The buffer damping hydraulic system according to claim 1, characterized in that: The accumulator (5) is a bladder accumulator or a piston accumulator.
10. A servo hydraulic test bench, characterized in that: Comprising the buffer damping hydraulic system as claimed in any one of claims 1 to 9.