CN115750484A - Hydraulic testing machine double-pump valve group device and control method thereof - Google Patents
Hydraulic testing machine double-pump valve group device and control method thereof Download PDFInfo
- Publication number
- CN115750484A CN115750484A CN202211598569.3A CN202211598569A CN115750484A CN 115750484 A CN115750484 A CN 115750484A CN 202211598569 A CN202211598569 A CN 202211598569A CN 115750484 A CN115750484 A CN 115750484A
- Authority
- CN
- China
- Prior art keywords
- valve
- pump
- double
- control
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Fluid-Pressure Circuits (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a double-pump valve bank device of a hydraulic testing machine and a control method thereof, relating to the field of control of electro-hydraulic servo testing machines, and comprising a valve bank, a double-pump, a servo motor, a driver, an electric cabinet, a bidirectional oil cylinder and a load sensor; the valve group consists of a digital throttle valve, a double-end reversing valve, an overflow valve and a valve plate; the double-connection pump consists of a plunger pump and a gear pump and is coaxially connected with and driven by the servo motor; the valve plate is internally designed with a hydraulic pipeline which is respectively connected with the digital throttle valve, the double-end reversing valve, the overflow valve and the double-connected pump through pipeline interfaces; the electric control box is electrically connected with a stepping motor and a servo motor driver which are arranged in the digital throttle valve; the bidirectional reversing valve has three structural states of forward direction, reverse direction and stop, and the functions of piston jacking, quick oil return and force closed-loop control are respectively realized. The whole structure is simple and compact, the performance is reliable, the system integration level is high, and the industrial application is easy.
Description
Technical Field
The invention relates to the technical field of electro-hydraulic servo testing machines, in particular to a double-pump valve bank device of a hydraulic testing machine and a control method thereof.
Background
The electro-hydraulic servo testing machine is a device for testing mechanical properties of a sample by using a hydraulic loading device, and mainly applies a hydraulic servo control technology to realize the functions of force loading closed loop and open loop movement. For a large-tonnage compression testing machine and a horizontal tension testing machine, because the oil cylinder has large specification and long stroke, the oil cylinder needs to take a long time to return after the test is finished, and further the efficiency of continuous test operation is influenced, a double-connection pump system is proposed and used in the testing machine industry in recent years when the technical problem is solved. The double-connection pump system is characterized in that a high-pressure plunger oil pump and a low-pressure gear pump are coaxially connected to a servo motor, the servo motor powered by a 220V power supply is utilized, and the beneficial effects of silence, energy conservation and high efficiency are achieved.
The double-connection pump system needs an integral hydraulic system technical scheme to realize the final functions. In the industry, a scheme of adopting a bidirectional digital throttle valve and a bidirectional reversing valve is adopted, wherein the bidirectional digital throttle valve is complex and has high processing requirement; the technical scheme of adopting two-way directional valves is that the reliability of the whole system is reduced greatly because the failure rate of the two-way directional valves is high when the two-way directional valves are not reversed. Therefore, the double-pump valve group device of the hydraulic testing machine is provided, and the whole system integration is achieved by designing a special valve plate through a simple one-way digital throttle valve and a whole hydraulic system structure scheme adopting a group of double-head reversing valves, so that on one hand, the adoption of a two-way digital throttle valve with a complex process is avoided, the product structure is simpler, and the processing is easier; on the other hand, the requirement of the number of the single products for using the reversing valve is reduced, the reliability of the system is further improved, the product cost is reduced, and the industrial mass application is easy.
Disclosure of Invention
The invention aims to provide a double-pump valve bank device of a hydraulic testing machine and a control method thereof.
The technical problem solved by the invention is as follows: how to utilize more succinct efficient hydraulic system structure to improve the reliability of testing machine electro-hydraulic servo control system product, reduce system cost and realize industrialization application simultaneously.
The invention can be realized by the following technical scheme: the utility model provides a hydraulic test machine doubly links pump valves device, includes: the system comprises a valve bank, a double pump, a servo motor, a driver, an electric cabinet, a bidirectional oil cylinder and a load sensor; the valve group consists of a digital throttle valve, a double-end reversing valve, an overflow valve and a valve plate; the double-connection pump consists of a plunger pump and a gear pump and is coaxially connected with and driven by the servo motor; the valve plate is internally designed with a hydraulic pipeline which is respectively connected with the digital throttle valve, the double-end reversing valve, the overflow valve and the double-connected pump through pipeline interfaces; the digital throttle valve is connected with the plunger pump and the rodless cavity of the bidirectional oil cylinder; the double-end reversing valve is connected with the gear pump and the two-way oil cylinder.
Furthermore, the digital throttle valve consists of a valve core, a valve sleeve, a stepping motor, a transmission shaft and a gear box, wherein the end part of the transmission shaft is provided with a thread which is in meshed transmission with a gear, and the stepping motor is electrically connected with the electric cabinet and adjusts a throttling opening by the stepping motor.
Furthermore, the bidirectional reversing valve has three structural states of forward direction, reverse direction and cut-off, and the states of the bidirectional reversing valve are controlled by the electric control box. In a forward state, the gear pump and the plunger pump simultaneously supply oil to the rodless cavity of the bidirectional oil cylinder, so that the quick ejection operation of the piston of the oil cylinder is realized; in a reverse state, the gear pump independently supplies oil to the rod cavity of the bidirectional oil cylinder, and the plunger pump directly supplies oil to the oil tank to realize quick oil return operation of the piston of the oil cylinder; and when the oil supply of the gear pump is in a cut-off state, the oil supply of the plunger pump is controlled by force loading, and the oil supply of the gear pump directly returns to the oil tank while the cut-off state reliably protects the gear pump from being influenced by high pressure.
Furthermore, the plunger pump is a high-pressure oil pump, the gear pump is a low-pressure oil pump, and a one-way valve is also connected between the gear pump and the two-way reversing valve; the plunger pump and the gear pump are coaxially connected with the servo motor and work cooperatively.
Furthermore, the electric cabinet is electrically connected with the digital throttle valve and the servo motor driver, and respectively controls the stepping motor inside the digital throttle valve to adjust the area of the throttle orifice and control the rotating speed of the servo motor.
A control method of a double pump valve group device of a hydraulic testing machine is characterized by comprising the following control states:
(1) In the piston jacking stage, the electric cabinet controls the digital throttle valve to a set throttle opening state, controls the servo motor to a set rotating speed and controls the bidirectional reversing valve to a forward state;
(2) In the force loading stage, the electric cabinet controls the two-way reversing valve to be switched to a cut-off state, and the cut-off state of the two-way reversing valve is utilized to protect the low-pressure gear pump; the control box acquires a pressure rate by acquiring a force value of the load sensor in real time, and performs PID closed-loop calculation on the pressure rate and a control target pressure rate to obtain a rotating speed instruction for controlling the servo motor, so as to realize control of the force loading rate;
(3) In the load bearing stage, the electric cabinet controls the bidirectional reversing valve to be switched to a cut-off state, and the cut-off state of the bidirectional reversing valve is utilized to protect the low-pressure gear pump; the control box acquires the force value of the load sensor in real time and performs PID closed-loop calculation with the control target force value to obtain a rotating speed instruction for controlling the servo motor, so that force keeping control is realized;
(4) In the oil cylinder quick oil return stage, the electric cabinet controls the two-way reversing valve to be switched to a reverse state, and the gear pump supplies oil to the rod cavity of the oil cylinder to realize a quick oil return function.
Further, the method comprises the following control steps:
(1) Initializing, after the system is electrified and self-checked, sending an instruction to an electric cabinet by a computer program according to a preset design to control and adjust the position of a valve port of the digital throttle valve to a certain specified initial state;
(2) The method comprises the following steps that no-load open loop is carried out, a computer program sends an instruction to an electric cabinet according to a preset design to control a bidirectional reversing valve to be switched to a forward direction, a servo motor is controlled to run to a certain specified rotating speed, and the movement of an oil cylinder piston is realized;
(3) Loading, namely when an oil cylinder piston is in contact with a tested piece, automatically switching to enter a closed-loop force loading stage after a loading force reaches an inlet force, and simultaneously controlling a switching bidirectional reversing valve to be in a cut-off state;
(4) The method comprises the following steps that uniform speed loading is carried out, an electric cabinet carries out closed-loop PID calculation on demand force rate and actual force rate fed back and calculated by a load sensor, real-time control is carried out on the output quantity of the rotating speed of a servo motor, and the electric cabinet enters a load holding stage or a test ending stage according to test requirements;
(5) In the load holding process, when the force value reaches a load holding target value preset in a computer program, entering a force load holding stage and starting a load holding timer, carrying out closed-loop PID (proportion integration differentiation) calculation on the demand force value and an actual force value fed back by a load sensor by an electric control box, controlling and adjusting the rotating speed output quantity of a servo motor in real time, and entering a uniform loading or test ending stage according to test requirements;
(6) End control, which is divided into two sub-phases: (6a) The computer program sends an electric control box instruction to control the digital throttle valve to reset the valve port according to a preset design, delays the completion of the reset and is used for quickly discharging the high-pressure hydraulic oil of the rodless cavity of the bidirectional oil cylinder; (6b) And sending instructions to the electric cabinet by the computer program to respectively control the bidirectional reversing valve to be in a reverse state and control the servo motor to be in a set oil return rotating speed, so that the oil cylinder can quickly return oil and return to the initial state of the next test.
Compared with the prior art, the invention has the following beneficial effects:
by designing a special valve plate and installing and connecting a digital throttle valve, a bidirectional reversing valve, an overflow valve, a double-link pump and a bidirectional oil cylinder, the whole system is simple and compact; by designing a simple one-way digital throttle valve and adopting an integral hydraulic system structure scheme of a group of double-head reversing valves, on one hand, the adoption of a two-way digital throttle valve with a complex process is avoided, so that the product structure is simpler and the processing is easier; on the other hand, the number of the reversing valves is reduced, the reliability of the system is further improved, the product cost is reduced, and the industrial mass application is easy. The technical scheme of the invention has the advantages that the functions of piston jacking, force loading control and quick oil return are realized by adopting the double-head reversing valve. Furthermore, the double-end reversing valve can realize force loading control in a stop state and simultaneously protect the gear pump from being influenced by high pressure, at the moment, the oil pressure of a rod cavity of the oil cylinder is set by the oil pressure of an overflow valve, and the pressure difference of force closed-loop control can be influenced by the overflow valve. The large-scale application of the device to products such as large-tonnage compression testing machines and horizontal tensile testing machines fully verifies that the device has the advantages of simple and compact structure, reliable performance, high use value and application prospect.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a hydraulic schematic diagram of a double-pump valve bank device of a hydraulic testing machine.
Fig. 2 is a left side view of the overall external structure of the double pump valve group device of the hydraulic testing machine.
Fig. 3 is a right side view of the overall external structure of the double pump valve group device of the hydraulic testing machine.
Fig. 4 is a perspective view of the internal pipeline of the valve plate of the double-pump valve group device of the hydraulic testing machine.
Fig. 5 is a perspective view of a digital throttle valve structure of a hydraulic testing machine double-pump valve set device.
Wherein: 11. a digital throttle valve; 111. a stepping motor; 112. a gear case; 113. a valve core; 114. a valve housing; 12. a double-ended reversing valve; 13. a valve plate; 14. an overflow valve; 15. a pressure gauge; 21. a plunger pump; 22. a gear pump; 23. a servo motor; 24. a stepping motor; 31. a bidirectional oil cylinder.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1-4, a hydraulic loading device for a double-pump valve set of a hydraulic testing machine includes: the system comprises a valve bank, a double pump, a servo motor, a driver, an electric cabinet and a bidirectional oil cylinder 31; the valve group consists of a digital throttle valve 11, a double-head reversing valve 12, an overflow valve 13 and a valve plate 14; the double pump is composed of a plunger pump 21 and a gear pump 22 and is coaxially connected with a servo motor 23 for driving; the valve plate is internally designed with a hydraulic pipeline which is respectively connected with the digital throttle valve 11, the double-end reversing valve 12, the overflow valve 13 and the double-connected pump through pipeline interfaces; the digital throttle valve 11 is connected with the plunger pump 21, the rodless cavity of the bidirectional oil cylinder 31 and the port A; the double-head reversing valve 12 is connected with the gear pump 22 and the two-way oil cylinder 31.
Referring to fig. 2-3, an overall structure schematic diagram of a hydraulic testing machine double-connection pump valve group is shown, wherein a digital throttle valve 11, a double-head reversing valve 12, an overflow valve 13 and a pressure gauge 15 are connected and installed on a valve plate 14 to form a complete hydraulic system. The valve plate 14 comprises a port 141 connected with the plunger pump 21, a port 142 connected with the gear pump 22, a tank port 143/144, a port 145 connected with a rodless cavity, namely a port A, of the bidirectional oil cylinder 31, and a port 146 connected with a rod cavity, namely a port B, of the bidirectional oil cylinder 31, wherein the port 142 of the valve plate 14 is connected with the gear pump 22, and the check valve 16 is added. The internal pipeline structure of the valve plate 14 can be seen in fig. 4, wherein the 141 interface is connected with the oil inlet of the high-pressure plunger pump 21, the internal pipeline channel is marked with light gray and is communicated with the rodless cavity, i.e., the port a, of the bidirectional oil cylinder 31 through a digital throttle valve, so that two oil pumps can simultaneously supply oil to the rodless cavity, i.e., the port a, of the bidirectional oil cylinder 31 in the piston jacking process; the 142 interface is an oil inlet of a low-pressure gear pump, and an internal pipeline channel is marked in white; wherein the 146 interface is a rod cavity of the bidirectional oil cylinder 31, namely a B-port oil supply port; the 143 and 144 interfaces are oil discharge ports and overflow ports, and the internal pipeline channels are marked in dark grey.
Referring to fig. 5, the digital throttle valve 11 is unidirectional and comprises a stepping motor 111, a gear box 112, a valve core 113 and a valve sleeve 114, wherein a thread is designed at the end of the valve core 113 to be meshed with the gear box 112 for transmission, and the stepping motor 111 is electrically connected with the electric control box and adjusts a throttling opening by the electric control box.
In this embodiment, the double-ended directional control valve 12 is a three-position directional control valve driven by a 220V power supply, and has three control states of forward direction, reverse direction and cut-off.
In this embodiment, the valve plate 14 can be manufactured according to the disclosed valve plate pipeline structure.
In this embodiment, for a 200 ton compression testing machine, the adopted plunger pump 21 parameter specification is: the rated rotation speed is 1500rpm, and the flow rate is 1.89L/min; for various specifications of horizontal tensile force testing machines, the rated rotating speed is 1500rpm, and the flow parameters are mainly divided into the following intervals: the flow rate of 30 tons or less is 2.64L/min, that of 60 tons or less is 4.51L/min, and that of 100 tons or less is 6.26L/min.
In this embodiment, the gear pump 22 can be selected to have 14L/min and 24L/min, wherein 24L/min can be used in 200 ton and higher tonnage machines, and faster piston movement speed can be achieved.
Therefore, the hydraulic and mechanical structure part of the hydraulic testing machine double-pump valve group device is realized.
Furthermore, a control mainboard, a stepping motor driver and a transformer are arranged in the electric cabinet, the control mainboard comprises a main chip basic circuit, a power supply processing circuit, an input-output circuit, an Ethernet communication circuit, a servo motor driving circuit and a stepping motor driving circuit, and the electric cabinet controls the work of the servo motor driver and the stepping motor driver through the servo motor driving circuit and the stepping motor driving circuit respectively so as to control the rotating speed of the servo motor and the position of the stepping motor. The electric control box is communicated with computer upper computer software through an Ethernet communication circuit and carries out data and instruction interaction. Thus, the electric control hardware part of the double-connection pump valve group system is realized.
The embodiment provides a control method of a double pump valve group device of a hydraulic testing machine, which comprises the following steps:
(1) Initializing, after the system is electrified and self-checked, sending an instruction to an electric cabinet by a computer program according to a preset design to control and adjust the position of a valve port of the digital throttle valve to a certain specified initial state;
(2) The method comprises the following steps that no-load open loop is carried out, a computer program sends an instruction to an electric cabinet according to a preset design to control a bidirectional reversing valve to be switched to a forward direction, and a servo motor is controlled to run to a certain specified rotating speed to realize the movement of an oil cylinder piston;
(3) Loading, namely when an oil cylinder piston is in contact with a tested piece, automatically switching to enter a closed-loop force loading stage after a loading force reaches an inlet force, and simultaneously controlling a switching bidirectional reversing valve to be in a cut-off state;
(4) The method comprises the following steps that uniform speed loading is carried out, an electric cabinet carries out closed-loop PID calculation on a demand force rate and an actual force rate fed back and calculated by a pressure sensor, the output quantity of the rotating speed of a servo motor is controlled and adjusted in real time, and the electric cabinet enters a load holding stage or a test ending stage according to test requirements;
(5) In the load holding process, when the force value reaches a preset load holding target value in a computer program, entering a force load holding stage and starting load holding timing, carrying out closed-loop PID (proportion integration differentiation) calculation on a demand force value and an actual force value fed back by a pressure sensor by an electric control box, controlling and adjusting the rotating speed output quantity of a servo motor in real time, and entering a constant-speed loading or test finishing stage again according to test requirements;
(6) End control, which is divided into two sub-phases: (6a) The computer program sends an electric control box instruction according to a preset design to control the digital throttle valve to reset a valve opening, and delays to wait for the completion of resetting, so that the computer program is used for quickly discharging the high-pressure hydraulic oil of the rodless cavity of the bidirectional oil cylinder, and the set resetting delay time is generally 5 seconds; (6b) And the computer program sends an instruction to the electric cabinet to respectively control the bidirectional reversing valve to be in a reverse state and control the servo motor to be in a set oil return rotating speed, so that the oil cylinder can quickly return oil and return to the initial state of the next test.
In conclusion, the embodiment provides the hydraulic loading device for the double-pump valve bank and the control method thereof, so that the functions of piston jacking, quick oil return and force closed-loop control are realized, and the whole hydraulic loading device is simple and compact in structure, reliable in performance, high in system integration level and easy for industrial application.
The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The utility model provides a hydraulic testing machine doubly links pump valves device which characterized in that includes: the system comprises a valve bank, a double pump, a servo motor, a driver, an electric cabinet, a bidirectional oil cylinder and a load sensor; the valve group consists of a digital throttle valve, a double-end reversing valve, an overflow valve and a valve plate; the double-connection pump consists of a plunger pump and a gear pump and is coaxially connected with and driven by a servo motor; the valve plate is internally designed with a hydraulic pipeline which is respectively connected with the digital throttle valve, the double-end reversing valve, the overflow valve and the double-connected pump through pipeline interfaces; the digital throttle valve is connected with the plunger pump and the rodless cavity of the bidirectional oil cylinder; the double-end reversing valve is connected with the gear pump and the two-way oil cylinder.
2. The double-pump valve bank device of the hydraulic testing machine as claimed in claim 1, wherein the digital throttle valve is composed of a valve core, a valve sleeve, a stepping motor, a transmission shaft and a gear box, wherein a thread is designed at an end of the transmission shaft to be meshed with a gear for transmission, and the stepping motor is electrically connected with the electric cabinet and adjusts a throttle orifice by the electric cabinet.
3. The double-pump valve bank device of the hydraulic testing machine as claimed in claim 1, wherein the bidirectional reversing valve has three structural states of forward direction, reverse direction and cut-off, and the states are controlled by the electric cabinet; the bidirectional reversing valve is in a forward state, the gear pump and the plunger pump simultaneously supply oil to the rodless cavity of the bidirectional oil cylinder, and the quick ejection operation of the piston of the oil cylinder is realized; in a reverse state, the gear pump independently supplies oil to the rod cavity of the bidirectional oil cylinder, and the plunger pump directly supplies oil to the oil tank to realize quick oil return operation of the piston of the oil cylinder; and when the gear pump is in a stop state, the plunger pump supplies oil to carry out force loading and force keeping control, and the gear pump supplies oil to directly return to the oil tank and reliably protects the gear pump from being influenced by high pressure in the stop state.
4. The double-pump valve group device of the hydraulic testing machine according to claim 1, wherein the plunger pump is a high-pressure oil pump, the gear pump is a low-pressure oil pump, and a check valve is further connected between the gear pump and the bidirectional reversing valve; the plunger pump and the gear pump are coaxially connected with the servo motor and work cooperatively.
5. The double-pump valve bank device of the hydraulic testing machine according to claim 1, wherein the electric control box is electrically connected with the digital throttle valve and the servo motor driver, and respectively controls a stepping motor inside the digital throttle valve to adjust the area of a throttle orifice and control the rotating speed of the servo motor.
6. A control method of a hydraulic testing machine double-pump valve group device is characterized by comprising the following control states:
(1) In the piston jacking stage, the electric cabinet controls the digital throttle valve to a set throttle opening state, controls the servo motor to a set rotating speed and controls the bidirectional reversing valve to a forward state;
(2) In the force loading stage, the electric cabinet controls the two-way reversing valve to be switched to a cut-off state, and the cut-off state of the two-way reversing valve is utilized to protect the low-pressure gear pump; the control box acquires the pressure rate by acquiring the force value of the load sensor in real time and performs PID closed-loop calculation with the control target pressure rate to obtain a rotating speed instruction for controlling the servo motor, so as to realize the control of the force loading rate;
(3) In the load bearing stage, the electric cabinet controls the two-way reversing valve to be switched to a cut-off state, and the cut-off state of the two-way reversing valve is utilized to protect the low-pressure gear pump; the control box acquires the force value of the load sensor in real time and performs PID closed-loop calculation with the control target force value to obtain a rotating speed instruction for controlling the servo motor, so that force maintenance control is realized;
(4) In the oil cylinder quick oil return stage, the electric cabinet controls the two-way reversing valve to be switched to a reverse state, and the gear pump supplies oil to the rod cavity of the oil cylinder to realize a quick oil return function.
7. A control method of a hydraulic loading device of a double-pump valve group is characterized by comprising the following control steps:
(1) Initializing, after the system is electrified and self-checked, sending an instruction to an electric cabinet by a computer program according to a preset design to control and adjust the position of a valve port of the digital throttle valve to a certain specified initial state;
(2) The method comprises the following steps that no-load open loop is carried out, a computer program sends an instruction to an electric cabinet according to a preset design to control a bidirectional reversing valve to be switched to a forward direction, and a servo motor is controlled to run to a certain specified rotating speed to realize the movement of an oil cylinder piston;
(3) Loading, namely when an oil cylinder piston is in contact with a tested piece, automatically switching to enter a closed-loop force loading stage after a loading force reaches an inlet force, and simultaneously controlling a switching bidirectional reversing valve to be in a cut-off state;
(4) The electric control box performs closed-loop PID calculation on the demand force rate and the actual force rate calculated by feedback of the load sensor, controls and adjusts the rotating speed output quantity of the servo motor in real time, and enters a load holding stage or a test finishing stage according to the test requirement;
(5) In the load holding process, when the force value reaches a preset load holding target value in a computer program, entering a force load holding stage and starting a load holding timer, carrying out closed-loop PID (proportion integration differentiation) calculation on a demand force value and an actual force value fed back by a load sensor by an electric control box, controlling and adjusting the rotating speed output quantity of a servo motor in real time, and entering a uniform speed loading or test finishing stage according to test requirements;
(6) The control is ended, which is divided into two sub-phases: (6a) The computer program sends an electric control box instruction to control the digital throttle valve to reset the valve port according to a preset design, delays the completion of the reset and is used for quickly discharging the high-pressure hydraulic oil of the rodless cavity of the bidirectional oil cylinder; (6b) And sending instructions to the electric cabinet by the computer program to respectively control the bidirectional reversing valve to be in a reverse state and control the servo motor to be in a set oil return rotating speed, so that the oil cylinder can quickly return oil and return to the initial state of the next test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211598569.3A CN115750484A (en) | 2022-12-14 | 2022-12-14 | Hydraulic testing machine double-pump valve group device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211598569.3A CN115750484A (en) | 2022-12-14 | 2022-12-14 | Hydraulic testing machine double-pump valve group device and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115750484A true CN115750484A (en) | 2023-03-07 |
Family
ID=85345913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211598569.3A Pending CN115750484A (en) | 2022-12-14 | 2022-12-14 | Hydraulic testing machine double-pump valve group device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115750484A (en) |
-
2022
- 2022-12-14 CN CN202211598569.3A patent/CN115750484A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200952456Y (en) | Axial variable plunger pump | |
| CN101571155A (en) | Digital electric-hydraulic synchronous control system | |
| CN201769389U (en) | Hydraulic press | |
| CN108386398B (en) | Pump control hydraulic system for controlling position of compound hydraulic cylinder | |
| CN204755430U (en) | Broken host computer actuating system | |
| CN104632794A (en) | Electro-hydraulic servo system of direct drive type hydraulic hoist | |
| CN201396344Y (en) | Digital electro-hydraulic isochronous control system | |
| CN108286545B (en) | Hydraulic control system for upper ram oil cylinder of internal mixer | |
| CN207687109U (en) | A kind of frequency conversion high-precision super high pressure hydraulic control loading system | |
| CN115978020A (en) | Injection hydraulic system of die casting machine based on independent load port | |
| CN114198348A (en) | Hydraulic system of super-tonnage servo pump-controlled bending machine and control method thereof | |
| CN204985169U (en) | Energy -conserving comprehensive experimental platform device of hydraulic pressure | |
| CN105782154A (en) | Hydraulic machining machine, hydraulic system thereof and control method of hydraulic system | |
| CN115750484A (en) | Hydraulic testing machine double-pump valve group device and control method thereof | |
| CN211116877U (en) | Integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system | |
| CN108252967A (en) | A kind of Hydraulic system and control method for being used to control energy-saving pump | |
| CN106194910A (en) | A kind of press and hydraulic pressure closed-loop control system thereof and method | |
| CN206936474U (en) | A kind of hydraulic system of hydraulic shear | |
| CN205937322U (en) | Press and hydraulic pressure closed loop control system thereof | |
| CN113306194B (en) | Energy-saving efficient low-noise hydraulic system of press machine | |
| CN101177806A (en) | Driving means for combing machine nipper | |
| CN108516467B (en) | The hydraulic control system and hoisting machinery of hoisting machinery | |
| CN102493968A (en) | Method and device for energy-saving control of elastic load based on electrohydraulic servo drive | |
| CN208497258U (en) | Ceramic press electrohydraulic control system | |
| CN105382324A (en) | Hydraulic control system of gate-type plate shearing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |