CN113686567A - Static loading test system - Google Patents
Static loading test system Download PDFInfo
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- CN113686567A CN113686567A CN202111245108.3A CN202111245108A CN113686567A CN 113686567 A CN113686567 A CN 113686567A CN 202111245108 A CN202111245108 A CN 202111245108A CN 113686567 A CN113686567 A CN 113686567A
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- pipeline
- unloading
- oil
- valve
- valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
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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
- F15B13/024—Pressure relief valves
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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
- F15B13/027—Check valves
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The invention provides a static force loading test system, which relates to the technical field of hydraulic systems and comprises the following components: the hydraulic cylinder comprises a rod cavity and a rodless cavity; the loading pipe group comprises an oil inlet pipeline connected with the rodless cavity and an oil return pipeline connected between the oil supply pipe and the rod cavity; the unloading pipe group comprises a first unloading pipeline communicated with the rod cavity and a second unloading pipeline communicated with the rodless cavity; and the control device is connected with the loading pipe group and the unloading pipe group and used for controlling the conduction states of the first unloading pipeline, the second unloading pipeline, the oil inlet pipeline and the oil return pipeline according to the state of the tested piece. This application can play the effect of an off-load protection to being tested the piece, after experimental end or completion test purpose, directly unload back to the oil tank through the fluid in two cavities of system control with the pneumatic cylinder in, can relieve two cavities of pneumatic cylinder inside full of fluid, still keep the state of original pressure fast to protect by the test piece, prevent by the test piece by the residual pressure damage, reduce the loss.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a static force loading test system.
Background
The static loading test is an important means for researching the fracture and the damage of the structure, and the application of the static loading test is very wide. The unloading protection is a common protection mode in a static loading test, when a tested piece is locally damaged, the control system can automatically protect the tested piece, the overall damage caused by the fact that the tested piece continuously bears the load is avoided, and the unloading protection module is an important part in the hydraulic test. The hydraulic cylinder is controlled to be in an unloading state, and the tested piece is protected from being damaged globally due to the fact that the tested piece does not bear loads any more.
The general protection system consists of a servo valve control circuit, a stop valve control circuit, a servo valve, a stop valve, a load sensor and a hydraulic cylinder, wherein the stop valve is arranged between the servo valve and the hydraulic cylinder, and the servo valve is controlled by the servo valve control circuit to work. When the tested piece is locally damaged, the load sensor can transmit signals to the stop valve control circuit and the servo valve control circuit, the stop valve control circuit immediately closes the two stop valves on the hydraulic cylinder oil way, and meanwhile, the servo valve control circuit controls the servo valve to return to a zero position, so that the oil way is further cut off, and the protection function is realized. However, after the protection system works, only the liquid supply and the liquid return of the hydraulic cylinder are cut off, the pressure of the hydraulic cylinder is not unloaded, the piston rod of the hydraulic cylinder is still kept at the position of the cut-off valve, the two cavities of the hydraulic cylinder are filled with hydraulic oil, and the pressure of the hydraulic cylinder is not unloaded by the protection system.
Disclosure of Invention
The invention aims to provide a static force loading test system to solve the problem that in a static force loading test in the prior art or the related art, an unloading protection module cannot unload the pressure in a hydraulic cylinder in time, so that the pressure still exists in the hydraulic cylinder, and the risk of crushing a tested piece exists.
It is therefore an object of the present invention to provide a static loading test system.
In order to achieve the above object, the technical solution of the present invention provides a static loading test system, which is used for a static loading test, and includes: the hydraulic cylinder comprises a rod cavity and a rodless cavity; the loading pipe group comprises an oil inlet pipeline connected with the rodless cavity and an oil return pipeline connected between the oil supply pipe and the rod cavity; the unloading pipe group comprises a first unloading pipeline communicated with the rod cavity and a second unloading pipeline communicated with the rodless cavity; and the control device is connected with the loading pipe group and the unloading pipe group and used for controlling the conduction states of the first unloading pipeline, the second unloading pipeline, the oil inlet pipeline and the oil return pipeline according to the state of the tested piece.
The static loading test system provided by the technical scheme of the invention is mainly used for playing an unloading protection role on a tested piece in a static loading test, and therefore, the static loading test system provided by the technical scheme of the invention designs two parallel pipe groups, one of which is a loading pipe group, can supply oil to provide pressure for a hydraulic cylinder through an oil tank in the test process, is provided with an oil inlet pipeline and an oil return pipeline which are respectively communicated with two cavities of the hydraulic cylinder, namely a rodless cavity and a rod cavity, can ensure that the system normally inputs oil for the rodless cavity to be pressurized in the test process so as to complete the static loading test on the tested piece, and can ensure that the oil in the system returns and is released after the test is completed or the test purpose is achieved so as to smoothly return the oil in the system to the oil tank. And the other tube group is an unloading tube group which is provided with a first unloading pipeline and a second unloading pipeline which are respectively communicated with the rod cavity and the rodless cavity of the hydraulic cylinder, and after the test is finished or the test purpose is finished, the oil in the two cavities of the hydraulic cylinder can be directly unloaded into the oil tank through system control, so that the state that the two cavities of the hydraulic cylinder are filled with the oil after the oil supply of the system is cut off and the original pressure is still kept can be quickly relieved, a tested piece acted by the hydraulic cylinder is protected, the tested piece is prevented from being damaged by residual pressure, and the loss is reduced.
Further, the static loading test system provided by the technical scheme of the invention is also provided with a control device, and the control device can be communicated with the loading pipe group and the unloading pipe group. The oil inlet pipeline and the oil return pipeline which are contained in the loading pipe group can be controlled through the electric signals, the first unloading pipeline and the second unloading pipeline which are contained in the unloading pipe group are controlled, the closing or conducting states of the two pipe groups and the four pipelines thereof can be comprehensively controlled, the centralized control is realized, the operation steps are reduced, and the operation is simple and convenient.
In the above technical scheme, the control device can be used for controlling the first unloading pipeline and the second unloading pipeline to be connected and controlling the oil inlet pipeline and the oil return pipeline to be disconnected when the state of the tested piece meets the preset unloading condition, and controlling the first unloading pipeline and the second unloading pipeline to be closed when the state of the tested piece does not meet the preset unloading condition.
In the technical scheme, the control device can receive the feedback of the pressure state of the tested piece and judge whether the unloading time is reasonable or not according to the feedback result. When the fact that the pressed state of the tested piece meets the preset unloading condition is detected, the control device can control the first unloading pipeline and the second unloading pipeline to be in a conduction state from a static state, and simultaneously control the oil inlet pipeline and the oil return pipeline in the loading pipe group to be disconnected, so that oil in the two cavities of the hydraulic cylinder can be guaranteed to flow back to the oil tank from the two unloading pipelines respectively. Through the control device, two chambers which are full of oil liquid in the hydraulic cylinder can be automatically judged and finished, the whole unloading process is accurate and reliable, the tested piece can be protected to the maximum extent, and the tested piece is prevented from being further damaged due to the residual pressure of the hydraulic cylinder.
Further, when the fact that the pressed state of the tested piece does not accord with the preset unloading condition is detected, the control device can control the first unloading pipeline and the second unloading pipeline to be restored to the closed state again, so that the resetting of the unloading pipe group is completed, and the next static force loading test can be conveniently used.
In the above technical scheme, the first unloading pipeline, the second unloading pipeline, the oil inlet pipeline and the oil return pipeline each include a switch valve for disconnecting and communicating the pipeline in which the switch valve is located, and each switch valve is connected with the control device and is used for being opened and closed under the control of the control device.
In the technical scheme, in order to enable the control device to accurately control the connection or disconnection of each pipeline, switch valves connected with the control device are arranged on each pipeline and can respectively realize the connection or disconnection operation of the pipelines under the control of the control device, so that the whole system can reasonably realize accurate control on each link in the static loading test process, and meanwhile, the control of the switch valves on each pipeline is centralized in the control device, and the unified management and operation of a user are facilitated.
In the above technical scheme, the switch valves are all electric control valves.
In the technical scheme, the switch valve for controlling the connection or disconnection of the pipeline can be an electric control valve, so that the control device can control the switch valve of the pipeline by using an electric signal.
In the above technical scheme, the switch valves are all pressure valves, the static loading test system further comprises a switching valve communicated with the oil supply pipe, an outlet of the switching valve is communicated with the four pressure valves respectively, when the switching valve is closed or disconnected, the opening and closing states of the two pressure valves on the first unloading pipeline and the second unloading pipeline are opposite to those of the two pressure valves on the oil inlet pipeline and the oil return pipeline, and the control device is connected with the switching valve and used for controlling the state of the switching valve according to the state of the tested piece.
In the technical scheme, the switch valve for controlling the connection or disconnection of the pipeline can also use a pressure valve, and compared with an electric control valve, the pressure valve has the advantages that the opening and closing of the pipeline are automatically controlled through the pressure of oil in the valve and a spring device, and relatively speaking, the pressure valve can be selected under the condition that manual control is not needed.
Further, the switch valve for controlling the connection or disconnection of the pipeline can simultaneously use the electric control valve and the pressure valve according to actual needs.
Furthermore, the static force loading test system is also provided with a switching valve which is communicated with an oil supply pipe and an oil return pipe from the oil tank, the two outlets of the switching valve can be communicated with the two parallel-connected pipe groups and the four pipelines thereof and always keep when the switching valve is closed or opened, the two pressure valves on the first unloading pipeline and the second unloading pipeline are opposite to the two pressure valves on the oil inlet pipeline and the oil return pipeline in opening and closing states, so that when the switching valve is closed, the oil tank supplies oil to the system, the unloading pipeline of the hydraulic cylinder is closed at the moment, the hydraulic cylinder can enter a locking state when the pressure in the system is kept unchanged, and the switching valve is closed when the hydraulic cylinder is unloaded, therefore, the oil inlet pipeline and the oil return pipeline are closed, oil in the hydraulic cylinder can directly flow back to the oil tank through the two unloading loops at the moment, and the function purpose of protecting the tested piece by fast unloading is achieved.
Further, the switching valve is an electromagnetic reversing valve and is an electronic control circuit switching valve which is conventionally used in a hydraulic system.
The switching valve is directly connected with the control device, and the control device can directly control the pressure supply process and the unloading process through the switching valve, so that convenience operation is realized, the simplicity and the accuracy of the system are improved, and the use by a user is facilitated.
Furthermore, the control device controls the loading pipe group and the unloading pipe group through a set control oil path, wherein pressure oil flows through the filter through the oil supply path and then is divided into two branches of pressure oil, one branch of pressure oil flows to the switching valve, flows into the four control branches through the switching valve, and then flows into the pressure valves on the two unloading pipelines of the unloading pipe group and the two pressure valves in the loading pipe group respectively, and at the moment, the hydraulic cylinder can be controlled through the loading control valve to carry out static loading on the tested piece.
In the above technical scheme, the two pressure valves on the first unloading pipeline and the second unloading pipeline are pressure-guiding valve check valves, inlets of the two pressure-guiding valve check valves are respectively communicated with the rod cavity and the rodless cavity, and the two pressure valves on the oil inlet pipeline and the oil return pipeline are both balanced type normally-closed logic valves or balanced type normally-open logic valves.
In the technical scheme, pressure valves arranged on a first unloading pipeline and a second unloading pipeline of the unloading pipe group are pressure guide valve check valves, inlets of the two pressure guide valve check valves on the two unloading loops are respectively communicated with a rod cavity and a rodless cavity of a hydraulic cylinder, and the flow direction of the check valve is set to flow from the hydraulic cylinder to an oil tank, so that when the state of a tested piece meets a preset unloading condition, the check valve is controlled to pour oil in the hydraulic cylinder back to the oil tank.
Furthermore, two pressure valves arranged on the oil inlet pipeline and the oil return pipeline select a balanced normally-closed logic valve or a balanced normally-open logic valve, and can be switched on or off according to an instruction of a control system, so that the pressure supply operation of the hydraulic cylinder is realized.
In the technical scheme, the static force loading test system further comprises a loading control valve, the loading control valve comprises a first channel and a second channel, the first channel and the second channel can be opened or closed, the oil inlet pipeline comprises the first channel, and the oil return pipeline comprises the second channel; the control device is connected with the loading control valve and used for controlling the control valve to return to a zero position when the state of the tested piece meets a preset unloading condition, and the first channel and the second channel are disconnected when the control valve is located at the zero position.
In the technical scheme, when the static loading test system supplies pressure to the oil tank or releases pressure in the system, a loading control valve is arranged on a channel connected with the oil tank, the loading control valve is respectively connected with an oil inlet and an oil outlet, the channel connected with the oil inlet is a first channel and is a part of an oil inlet pipeline, and the channel connected with the oil outlet is a second channel and is a part of an oil return pipeline.
Further, the load control valve uses a conventional solenoid valve, such as a three-position, four-way solenoid valve. At the moment, a port P of the three-position four-way electromagnetic valve is connected with a liquid supply oil way, a port A and a port B are connected with a rodless cavity and a rod cavity of the hydraulic cylinder, and a port T is connected with a liquid return oil way.
Furthermore, the loading control valve can be connected with the control device, so that when the control device judges that the state of the tested piece meets the preset unloading condition, the loading control valve can be controlled to return to a zero position, at the moment, the loading control valve is in a disconnected state, a first channel connected with the oil inlet pipeline and the oil inlet and a second channel connected with the oil outlet and the oil return pipeline can be cut off, at the moment, the pressure in the hydraulic cylinder can be locked, or the oil in the hydraulic cylinder is prevented from flowing back from the oil inlet pipeline and the oil return pipeline in the unloading stage of the hydraulic cylinder.
In the technical scheme, the first unloading pipeline and the second unloading pipeline of the static force loading test system both comprise throttle valves, and the throttle valves are used for controlling the flow of the pipelines where the throttle valves are located.
In the technical scheme, the static loading test system is characterized in that a throttle valve is respectively connected in series with a pressure valve closed by a control switch on a first unloading pipeline and a second unloading pipeline, when the static loading test is completed or the aim is achieved, the hydraulic cylinder is unloaded, at the moment, the two unloading pipelines are conducted, oil in the hydraulic cylinder flows back into an oil tank through the two unloading pipelines, at the moment, the oil in the unloading pipelines flows through the throttle valve through the pressure valve, the control on the flow can be obtained under the control of the throttle valve, a user can control the unloading time by adjusting the throttle valve, a control means is further provided for the pressure reduction amplitude in the hydraulic cylinder, the various unloading requirements of the system on the hydraulic cylinder are met under different actual requirements, and the use flexibility of the system is improved.
In the above technical scheme, the oil supply pipe is provided with a filter.
In the technical scheme, the filter is arranged on the first channel connecting the oil tank to the loading control valve, so that the oil entering the oil circuit of the system can meet the requirement of control valves such as servo valves on the cleanliness of the oil.
In the above technical solution, the static force loading test system further includes a detection device connected to the control device, and configured to detect a state of the tested piece and send the detected state of the tested piece to the control device.
In the technical scheme, in order to accurately control the compression state of the tested piece and prevent the tested piece from being irretrievably and seriously damaged under the condition of over-pressure, the invention provides a detection device which is connected with or arranged in a control device and has the functions of detecting the compression state of the tested piece in real time and transmitting the detected compression state of the tested piece to the control device, so that the control device can further judge whether the tested piece meets the preset pressure relief condition, and carry out hydraulic cylinder unloading operation or continuously supply pressure to a system according to the judgment result or maintain the pressure locking state of the hydraulic cylinder. The detection device can provide feedback of a test result for the control device, is convenient for the accuracy of the system in the using process, provides guarantee for the test result to the maximum extent, and also provides reliable protection for a tested piece.
Furthermore, a signal processing device can be arranged between the detection device and the control device, and can process and judge the signals detected by the detection device and feed back the judgment result to the control device so as to give an indication whether the control device enters an unloading stage or not.
In the above technical solution, the detecting device includes a load sensor for detecting a load carried by the test piece.
In the technical scheme, the load sensor is arranged between the hydraulic cylinder and the tested piece, can monitor the state of the tested piece after the pressure of the hydraulic cylinder is applied to the tested piece in real time, and transmits the pressure load of the hydraulic cylinder applied to the tested piece to the control device through the detection device, so that the control device can execute subsequent operation. When a tested piece is locally damaged, the tested piece is unbalanced in loading, the load sensor transmits a signal to the control system at the moment, the control system controls the switching valve to change the direction, pressure oil does not flow into four control oil paths any more, the pressure valve on the loading pipeline is closed, the oil path between the loading control valve and the servo hydraulic cylinder is cut off, the unloading pipe group is opened, oil liquid in two cavities of the servo hydraulic cylinder can directly return to the oil tank through two pressure relief pipelines, the unloading protection function is realized, and the unloading speed can be controlled by adjusting the throttle valve. Meanwhile, the control device controls the loading control valve to return to a zero position, and further cuts off an oil way. The protection is realized, and the tested piece is not subjected to load any more, so that the overall damage is caused.
In the technical scheme, the static force loading test systems are integrated on the same valve block.
In the technical scheme, the valve block is used as a carrier for protecting the whole static force loading test system, and is provided with a system oil way, a plug-in mounting hole and a mounting surface of a control valve and an integrated mounting hole of the whole system, so that the valve block is exquisite in structure and convenient to mount, dismount and maintain.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a static loading test system provided by an embodiment of the invention in a static loading test state;
fig. 2 is a schematic state diagram of a tested piece in a static loading test, which is provided by the embodiment of the invention, when the tested piece meets an unloading condition.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
the device comprises an oil cylinder 1, a filter 2, a first channel 3, a second channel 4, a loading control valve 5, an oil inlet pipeline 6, an oil return pipeline 7, a first unloading pipeline 8, a second unloading pipeline 9, a servo hydraulic cylinder 10, a rodless cavity 11, a rod cavity 12, a tested piece 13, a switching valve 14, a first unloading pipeline pressure valve 15a, a second unloading pipeline pressure valve 15b, an oil inlet pipeline pressure valve 16a, an oil return pipeline pressure valve 16b, a first unloading pipeline throttling valve 17a, a second unloading pipeline throttling valve 17b, a control device 18, a control oil circuit 19, a signal processing device 20 and a load sensor 21.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A static loading test system provided according to an embodiment of the present invention is described below with reference to fig. 1 and 2.
As shown in fig. 1 and 2, the embodiment of the present invention provides a static loading test system for a static loading test, which includes a servo hydraulic cylinder 10, a loading tube group, an unloading tube group and a control device 18. The servo hydraulic cylinder 10 includes a rod chamber 12 and a rodless chamber 11. The charge tube set comprises an oil inlet line 6 connected to the rodless chamber 11 and an oil return line 7 connected between the oil supply line and the rod chamber 12. The unloading pipe group comprises a first unloading pipeline 8 communicated with a rod cavity 12 and a second unloading pipeline 9 communicated with a rodless cavity 11. The control device 18 is connected with the loading pipe group and the unloading pipe group and is used for controlling the conduction states of the first unloading pipeline 8, the second unloading pipeline 9, the oil inlet pipeline 6 and the oil return pipeline 7 according to the state of the tested piece 13.
The static loading test system provided by the embodiment of the invention is mainly used for playing an unloading protection role on a tested piece 13 in a static loading test, and therefore, the embodiment of the invention designs two parallel pipe sets, one of which is a loading pipe set, so that oil can be supplied to a servo hydraulic cylinder 10 through an oil cylinder 1 in the test process, the system is provided with an oil inlet pipeline 6 and an oil return pipeline 7 which are respectively communicated with two chambers of the servo hydraulic cylinder 10, namely a rodless chamber 11 and a rod chamber 12, so that the system can be ensured to normally input oil into the rodless chamber 11 for pressurization in the test process, the static loading test on the tested piece 13 is completed, and meanwhile, the oil in the system can be ensured to return oil and release pressure after the test is completed or the test purpose is achieved, so that the oil in the system can smoothly flow back into the oil cylinder 1. And the other tube group is an unloading tube group which is provided with a first unloading pipeline 8 and a second unloading pipeline 9 which are respectively communicated with a rod cavity 12 and a rodless cavity 11 of the servo hydraulic cylinder 10, after the test is finished or the test purpose is finished, oil in the two cavities of the servo hydraulic cylinder 10 can be directly unloaded back into the oil cylinder 1 through system control, the state that the two cavities of the servo hydraulic cylinder 10 are filled with the oil and still keep the original pressure after the oil supply of the system is cut off can be rapidly relieved, and therefore a tested piece 13 acted by the servo hydraulic cylinder 10 is protected, the tested piece 13 is prevented from being damaged by excess pressure, and loss is reduced.
Further, the static loading test system proposed by the embodiment of the present invention further has a control device 18, and the control device 18 can be communicated with the loading tube group and the unloading tube group. The oil inlet pipeline 6 and the oil return pipeline 7 which are contained in the loading pipe group and the first unloading pipeline 8 and the second unloading pipeline 9 which are contained in the unloading pipe group can be controlled through electric signals, the closing or conducting states of the two pipe groups and the four pipelines thereof can be controlled integrally, centralized control is achieved, operation steps are reduced, and operation is simple and direct.
In the above embodiment, the control device 18 can be used to control the first unloading line 8 and the second unloading line 9 to be connected and the oil inlet line 6 and the oil return line 7 to be disconnected when the state of the tested piece 13 satisfies the preset unloading condition, and to control the first unloading line 8 and the second unloading line 9 to be closed when the state of the tested piece 13 does not satisfy the preset unloading condition.
In this embodiment, the control device 18 can receive feedback of the pressure state of the test object 13 and determine whether or not a reasonable unloading timing is available based on the feedback result. When the pressurized state of the tested piece 13 is detected to meet the preset unloading condition, the control device 18 can control the first unloading pipeline 8 and the second unloading pipeline 9 to be changed from a static state to a conducting state, and simultaneously control the oil inlet pipeline 6 and the oil return pipeline 7 in the loading pipe group to be disconnected, so that the oil in the two cavities of the servo hydraulic cylinder 10 can respectively flow back to the oil cylinder 1 from the two unloading pipelines. Through the control device 18, the unloading of the two chambers filled with the oil liquid in the servo hydraulic cylinder 10 can be automatically judged and completed, so that the whole unloading process is accurate and reliable, the tested piece 13 can be protected to the maximum extent, and the tested piece 13 is prevented from being further damaged due to the residual pressure of the servo hydraulic cylinder 10.
Further, when it is detected that the pressed state of the tested piece 13 does not meet the preset unloading condition, the control device 18 can control the first unloading pipeline 8 and the second unloading pipeline 9 to be restored to the closed state again, so as to complete the resetting of the unloading pipe group, and facilitate the use of the next static loading test.
In the above embodiment, as shown in fig. 1 and fig. 2, the first unloading line 8, the second unloading line 9, the oil inlet line 6 and the oil return line 7 respectively included in the two tube groups are respectively provided with a switch valve capable of being disconnected and communicated, and each switch valve is respectively connected with the control device 18 and can be opened and closed under the control of the control device 18.
In this embodiment, in order to enable the control device 18 to accurately control the connection or disconnection of each pipeline, a switch valve connected to the control device 18 is provided on each pipeline, and these switch valves can respectively implement the connection or disconnection operation of the pipelines under the control of the control device 18, so that the whole system can reasonably implement accurate control of each link in the static loading test process, and control of the switch valve on each pipeline is centralized in the control device 18, thereby facilitating the unified management and operation of a user.
In the above embodiment, the switching valves are all electric control valves, or the switching valves are all pressure valves, the static loading test system further includes a switching valve 14 communicated with the oil supply pipe, an outlet of the switching valve 14 is respectively communicated with the four pressure valves, and when the switching valve 14 is closed or opened, the first unloading line pressure valve 15a and the second unloading line pressure valve 15b are opposite to the opening and closing states of the oil inlet line pressure valve 16a and the oil return line pressure valve 16 b. The control device 18 is connected to the switching valve 14 and is used for controlling the state of the switching valve 14 according to the state of the tested piece 13.
In this embodiment, the switching valve for controlling the connection or disconnection of the pipeline may be an electrically controlled valve, and this arrangement enables the control device 18 to control the switching valve of the pipeline by using an electrical signal.
Further, the switching valve for controlling the on/off of the pipeline may also use a pressure valve, which has an advantage over an electric control valve in that the opening and closing of the pipeline are automatically controlled by the pressure of the oil in the valve and a spring device, and relatively speaking, the pressure valve may be selected without manual control.
Further, the switch valve for controlling the connection or disconnection of the pipeline can simultaneously use the electric control valve and the pressure valve according to actual needs.
Furthermore, the static loading test system also has a switching valve 14, which is connected with the oil supply pipe and the oil return pipe from the oil cylinder 1, two outlets of the switching valve 14 can be connected with the two pipe groups and four pipelines thereof which are connected in parallel, and when the switching valve 14 is closed or opened, the first unloading pipeline pressure valve 15a and the second unloading pipeline pressure valve 15b are opposite to the opening and closing states of the oil inlet pipeline pressure valve 16a and the oil return pipeline pressure valve 16b, so that when the switching valve 14 is closed, the oil cylinder 1 supplies oil to the system, the unloading pipeline of the servo hydraulic cylinder 10 is closed, the servo hydraulic cylinder 10 can enter a locking state when the pressure in the system is kept unchanged, and when the servo hydraulic cylinder 10 is unloaded, the switching valve 14 is closed, so that the oil inlet pipeline 6 and the oil return pipeline 7 are closed, and at this time, the oil in the servo hydraulic cylinder 10 can directly flow back to the oil cylinder 1 through the two unloading loops, the function purpose of protecting the tested piece 13 by fast unloading is realized.
Further, as shown in fig. 1, the switching valve 14 is an electromagnetic directional valve, and is an electronic control circuit switching valve 14 conventionally used in a hydraulic system.
The switching valve 14 is directly connected with the control device 18, and the control device 18 can directly control the pressure supply process and the unloading process through the switching valve 14, so that convenience operation is realized, the simplicity and the accuracy of the system are improved, and the use by a user is facilitated.
Further, the control device 18 specifically controls the loading tube group and the unloading tube group through a control oil path 19, wherein the pressure oil flows through the filter 2 through the oil supply path and then is divided into two branches of pressure oil, one branch of the pressure oil flows to the switching valve 14, and then flows into the four control branches through the switching valve 14, and then flows into the first unloading line pressure valve 15a and the second unloading line pressure valve 15b of the unloading tube group, and the oil inlet line pressure valve 16a and the oil return line pressure valve 16b of the loading tube group, respectively, at this time, the servo hydraulic cylinder 10 can be controlled by the loading control valve 5 to perform static loading on the tested piece 13.
In the above embodiment, as shown in fig. 2, the two pressure valves 15a and 15b on the first unloading line 8 and the second unloading line 9 are both pressure-guiding-closing one-way valves, inlets of the two pressure-guiding-closing one-way valves are respectively communicated with the rod chamber 12 and the rodless chamber 11, and the two pressure valves 16a and 16b on the oil inlet line 6 and the oil return line 7 are both balanced type normally closed logic valves or balanced type normally open logic valves.
In this embodiment, the first unloading line pressure valve 15a and the second unloading line pressure valve 15b of the unloading pipe group are both pressure-guiding valve-closing check valves, and the inlets of the two pressure-guiding valve-closing check valves on the two unloading circuits are respectively communicated with the rod chamber 12 and the rodless chamber 11 of the servo hydraulic cylinder 10, and the flow direction of the check valve is set to flow from the servo hydraulic cylinder 10 to the cylinder 1, so that the first unloading line pressure valve 15a and the second unloading line pressure valve 15b can pour the oil in the hydraulic cylinder 10 back to the cylinder 1 when the state of the tested piece 13 satisfies the preset unloading condition.
Further, the oil inlet line pressure valve 16a and the oil return line pressure valve 16b are balanced normally closed logic valves or balanced normally open logic valves, which can be turned on or off according to an instruction of a control system, thereby implementing pressure supply operation on the servo hydraulic cylinder 10.
In the above embodiment, the static force loading test system further includes a loading control valve 5, the loading control valve 5 includes a first passage 3 capable of being opened and closed and a second passage 4 capable of being opened and closed, the oil inlet line 6 includes the first passage 3, and the oil return line 7 includes the second passage 4; the control device 18 is connected with the loading control valve 5 and is used for controlling the control valve to return to a zero position when the state of the tested piece 13 meets a preset unloading condition, and when the control valve is located at the zero position, the first channel 3 and the second channel 4 are disconnected.
In this embodiment, when the oil cylinder 1 supplies pressure or the pressure in the system is relieved, the channel connected with the oil cylinder 1 is provided with a loading control valve 5, the loading control valve 5 is respectively connected with an oil inlet and an oil outlet, the channel connected with the oil inlet is a first channel 3 which is a part of an oil inlet pipeline 6, and the channel connected with the oil outlet is a second channel 4 which is a part of an oil return pipeline 7.
Further, as shown in fig. 1 and 2, the charge control valve 5 uses a conventional solenoid valve, such as a three-position four-way solenoid valve. At the moment, a port P of the three-position four-way servo electromagnetic valve is connected with a liquid supply oil way, a port A and a port B are connected with a rodless cavity 11 and a rod cavity 12 of a servo hydraulic cylinder 10, and a port T is connected with a liquid return oil way.
Further, the loading control valve 5 can be connected with the control device 18, so that when the control device 18 determines that the state of the tested piece 13 meets the preset unloading condition, the loading control valve 5 can be controlled to return to a zero position, at the moment, the loading control valve 5 is in a disconnected state, the first channel 3 connected with the oil inlet of the oil inlet pipeline 6 and the second channel 4 connected with the oil outlet of the oil return pipeline 7 can be cut off, at the moment, the servo hydraulic cylinder 10 can be locked by pressure, or the oil in the hydraulic cylinder is prevented from flowing back from the oil inlet pipeline 6 and the oil return pipeline 7 in the unloading stage of the hydraulic cylinder 10.
In the above embodiment, the static force loading test system is provided with the first unloading pipeline throttle valve 17a and the second unloading pipeline throttle valve 17b, which can be used for controlling the flow of the pipeline where the static force loading test system is located.
In this embodiment, in the static loading test system, on the first unloading pipeline 8 and the second unloading pipeline 9, the first unloading pipeline pressure valve 15a with a closed control switch is connected in series with a first unloading pipeline throttle valve 17a, and the second unloading pipeline pressure valve 15b is connected in series with a second unloading pipeline throttle valve 17b, when the static loading test is completed or the purpose is achieved, the servo hydraulic cylinder 10 is unloaded, at this time, the two unloading pipelines are conducted, so that the oil in the servo hydraulic cylinder 10 flows back into the oil cylinder 1 through the two unloading pipelines, at this time, the oil in the unloading pipelines respectively flows through the first unloading pipeline throttle valve 17a and the second unloading pipeline throttle valve 17b through the first unloading pipeline pressure valve 15a and the second unloading pipeline pressure valve 15b, and under the control of the two throttle valves, the control effect of the oil flow can be achieved, so that a user can regulate and control the unloading pipeline throttle valves 17a and 17b through the first unloading pipeline throttle valve 17a and the second unloading pipeline throttle valve 17b, and can control the unloading flow of the oil flow rate through the two throttle valves The load time is controlled, a control means is further provided for the pressure reduction amplitude in the servo hydraulic cylinder 10, the unloading requirements of the system on the servo hydraulic cylinder 10 can be met under different actual requirements, and the use flexibility of the system is improved.
In the above embodiment, the oil supply pipe is provided with the filter 2.
In the embodiment, the filter 2 is arranged on the first channel 3 connecting the oil cylinder 1 to the loading control valve 5, so that the oil entering the oil circuit of the system can meet the requirement of control valves such as servo valves on the cleanliness of the oil.
In the above embodiment, the static force loading test system further includes a detection device connected to the control device 18, and configured to detect the state of the test object 13 and send the detected state of the test object 13 to the control device 18.
In this embodiment, in order to accurately control the pressure state of the tested object 13 and prevent the tested object 13 from being irreparably and seriously damaged under the condition of over-pressure, the present invention provides a detection device, which is connected to the control device 18 or arranged inside the control device 18, and has the functions of detecting the pressure state of the tested object 13 in real time and transmitting the detected pressure state of the tested object 13 to the control device 18, so that the control device 18 can further determine whether the tested object 13 meets the preset pressure relief condition, and according to the determination result, perform the unloading operation of the servo hydraulic cylinder 10 or continue the pressure supply of the system, or maintain the pressure lock state of the servo hydraulic cylinder 10, and the detection device can provide the feedback of the test result for the control device, thereby facilitating the accuracy of the system in the using process and maximally providing guarantee for the test result, and also provides reliable protection for the tested piece 13.
Further, a signal processing device 20 may be disposed between the detection device and the control device 18, and may be configured to process and determine the signal detected by the detection device, and feed back the determination result to the control device 18 to give an indication whether the control device 18 enters the unloading stage.
In the above-described embodiment, the detection means includes the load sensor 21 for detecting the load carried by the test piece 13.
In this embodiment, the load sensor 21 is disposed between the servo hydraulic cylinder 10 and the tested piece 13, and is capable of monitoring the state of the tested piece 13 after being pressurized by the servo hydraulic cylinder 10 in real time, and transmitting the pressure load of the servo hydraulic cylinder 10 on the tested piece 13 to the control device 18 through the detection device, so that the control device 18 can perform subsequent operations. When the tested piece 13 is locally damaged, the tested piece 13 is unbalanced under load, at the moment, the load sensor 21 transmits a signal to the control system, the control system controls the switching valve 14 to change the direction, pressure oil does not flow into the four control oil paths 19 any more, the oil inlet pipeline pressure valve 16a and the oil return pipeline pressure valve 16b on the loading pipeline are closed, the oil path between the loading control valve 5 and the servo hydraulic cylinder 10 is cut off, the unloading pipe group is opened, oil liquid in two cavities of the servo hydraulic cylinder 10 can directly return to the oil cylinder 1 through the two pressure relief pipelines, the unloading protection function is realized, and the unloading speed can be controlled by adjusting the first unloading pipeline throttle valve 17a and the second unloading pipeline throttle valve 17 b. At the same time, the control device 18 controls the loading control valve 5 to return to the zero position, and further cuts off the oil circuit. The protection is realized, and the tested piece 13 is not loaded any more, so that the overall damage is caused.
In the above embodiments, the static loading test systems are all integrated on the same valve block.
In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A static loading test system, comprising:
the hydraulic cylinder comprises a rod cavity and a rodless cavity;
the loading pipe group comprises an oil inlet pipeline connected with the rodless cavity and an oil return pipeline connected between the oil supply pipe and the rod cavity;
the unloading pipe group comprises a first unloading pipeline communicated with the rod cavity and a second unloading pipeline communicated with the rodless cavity;
and the control device is connected with the loading pipe group and the unloading pipe group and used for controlling the conduction states of the first unloading pipeline, the second unloading pipeline, the oil inlet pipeline and the oil return pipeline according to the state of the tested piece.
2. A static load testing system according to claim 1, wherein the control means is arranged to:
when the state of the tested piece meets a preset unloading condition, controlling the first unloading pipeline and the second unloading pipeline to be conducted, and controlling the oil inlet pipeline and the oil return pipeline to be disconnected;
and when the state of the tested piece does not meet the preset unloading condition, controlling the first unloading pipeline and the second unloading pipeline to be closed.
3. A static load testing system according to claim 1,
the first unloading pipeline, the second unloading pipeline, the oil inlet pipeline and the oil return pipeline respectively comprise a switch valve for disconnecting and communicating the pipelines in which the first unloading pipeline, the second unloading pipeline, the oil inlet pipeline and the oil return pipeline are arranged;
each switch valve is connected with the control device and can be opened and closed under the control of the control device.
4. A static load testing system according to claim 3,
the switch valves are all electric control valves; or
The switching valves are pressure valves, the static loading test system further comprises a switching valve communicated with the oil supply pipe, outlets of the switching valve are respectively communicated with the four pressure valves, when the switching valve is closed or disconnected, the two pressure valves on the first unloading pipeline and the second unloading pipeline are opposite to the opening and closing states of the two pressure valves on the oil inlet pipeline and the oil return pipeline, and the control device is connected with the switching valve and used for controlling the state of the switching valve according to the state of the tested piece.
5. A static load testing system according to claim 4,
the two pressure valves on the first unloading pipeline and the second unloading pipeline are pressure-guiding valve check valves, and inlets of the two pressure-guiding valve check valves are respectively communicated with the rod cavity and the rodless cavity; and/or
And the two pressure valves on the oil inlet pipeline and the oil return pipeline are balanced normally-closed logic valves or balanced normally-open logic valves.
6. A static load testing system as claimed in claim 1 further comprising:
the loading control valve comprises a first channel and a second channel, the first channel and the second channel can be opened or closed, the oil inlet pipeline comprises the first channel, and the oil return pipeline comprises the second channel;
the control device is connected with the loading control valve and used for controlling the control valve to return to a zero position when the state of the tested piece meets a preset unloading condition, and when the control valve is located at the zero position, the first channel and the second channel are disconnected.
7. A static load testing system as claimed in claim 1 further comprising:
the first unloading pipeline and the second unloading pipeline both comprise throttle valves, and the throttle valves are used for controlling the flow of the pipelines where the throttle valves are located.
8. A static loading test system according to any one of claims 1 to 7,
the oil supply pipe is provided with a filter.
9. A static loading test system according to any one of claims 1 to 7 further comprising:
and the detection device is connected with the control device and used for detecting the state of the tested piece and sending the detected state of the tested piece to the control device.
10. A static load testing system according to claim 9, wherein the sensing means comprises a load cell for sensing the load carried by the test piece.
11. A static loading test system according to any one of claims 1 to 7,
the static force loading test systems are all integrated on one valve block.
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|---|---|---|---|
| CN202111245108.3A CN113686567A (en) | 2021-10-26 | 2021-10-26 | Static loading test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111245108.3A CN113686567A (en) | 2021-10-26 | 2021-10-26 | Static loading test system |
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| CN113686567A true CN113686567A (en) | 2021-11-23 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013112109A1 (en) * | 2012-01-23 | 2013-08-01 | Demi̇rer Teknoloji̇k Si̇stemler Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Energy efficient hydrostatic transmission circuit for an asymmetric actuator utilizing a single 4 - quadrant pump |
| CN204646826U (en) * | 2015-03-06 | 2015-09-16 | 安徽恒源煤电股份有限公司 | A kind of hydraulic system of hydraulic test bench |
| CN205639175U (en) * | 2016-04-27 | 2016-10-12 | 沈阳中之杰流体控制系统有限公司 | Loading is new construction protective film piece for servo cylinder |
| CN106930988A (en) * | 2017-03-24 | 2017-07-07 | 南京航空航天大学 | Sound state bidirectional hydraulic loading device and its control method based on accumulator |
| CN107505202A (en) * | 2017-06-21 | 2017-12-22 | 柳州职业技术学院 | A kind of material fatigue testing machine tool loading device |
| CN109869377A (en) * | 2017-12-01 | 2019-06-11 | 中国飞机强度研究所 | A kind of controllable uninstalling system |
| CN110131240A (en) * | 2019-05-16 | 2019-08-16 | 中国重型机械研究院股份公司 | A kind of hydraulic position and pressure closed loop control dynamic static simulation pilot system and method |
-
2021
- 2021-10-26 CN CN202111245108.3A patent/CN113686567A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013112109A1 (en) * | 2012-01-23 | 2013-08-01 | Demi̇rer Teknoloji̇k Si̇stemler Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Energy efficient hydrostatic transmission circuit for an asymmetric actuator utilizing a single 4 - quadrant pump |
| CN204646826U (en) * | 2015-03-06 | 2015-09-16 | 安徽恒源煤电股份有限公司 | A kind of hydraulic system of hydraulic test bench |
| CN205639175U (en) * | 2016-04-27 | 2016-10-12 | 沈阳中之杰流体控制系统有限公司 | Loading is new construction protective film piece for servo cylinder |
| CN106930988A (en) * | 2017-03-24 | 2017-07-07 | 南京航空航天大学 | Sound state bidirectional hydraulic loading device and its control method based on accumulator |
| CN107505202A (en) * | 2017-06-21 | 2017-12-22 | 柳州职业技术学院 | A kind of material fatigue testing machine tool loading device |
| CN109869377A (en) * | 2017-12-01 | 2019-06-11 | 中国飞机强度研究所 | A kind of controllable uninstalling system |
| CN110131240A (en) * | 2019-05-16 | 2019-08-16 | 中国重型机械研究院股份公司 | A kind of hydraulic position and pressure closed loop control dynamic static simulation pilot system and method |
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