CN214067656U - Frequency conversion servo equipment for pressure testing machine - Google Patents
Frequency conversion servo equipment for pressure testing machine Download PDFInfo
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- CN214067656U CN214067656U CN202022375249.4U CN202022375249U CN214067656U CN 214067656 U CN214067656 U CN 214067656U CN 202022375249 U CN202022375249 U CN 202022375249U CN 214067656 U CN214067656 U CN 214067656U
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Abstract
The utility model discloses a frequency conversion servo equipment for a pressure tester, which comprises a computer, a control box, a motor, a throttle valve group, a frequency converter, a gear pump, an oil filter, a host, a sensor and an oil cylinder; wherein: the control box is communicated with the computer through Ethernet connection, receives and executes instructions of a computer program, is connected with the frequency converter, sends a rotating speed instruction for controlling the frequency converter and controls the frequency converter to stop/start, is connected with the sensor, supplies power to the sensor and receives signals from the sensor; the built-in switching-over valve that has the switching-over function that has of throttle valves, the throttle mouth of throttle valves is set for by manual regulation for realize high accuracy throttle effect and the oil return function among the pressure testing machine servo control process. The utility model discloses possess the loading and hold that the lotus is stable, the power value precision is high, whole computer automatic control, the biggest loading pressure height, possess the loading, hold the lotus and compound functions such as switching-over.
Description
Technical Field
The utility model belongs to the technical field of mechanical measurement, especially, relate to a frequency conversion servo equipment for compression testing machine.
Background
The hydraulic servo system of the conventional full-automatic pressure testing machine mainly adopts a digital valve as a main measurement and control execution element, a control system mainly comprises the digital valve, a pressure reducing valve, a control box, an oil pump and an oil cylinder, the control system controls the flow of hydraulic oil by adjusting the digital valve so as to control the loading and load-holding process of the pressure testing machine, and the hydraulic servo system has the main defects of large overall energy consumption of the system and large resetting noise of the digital valve in the working process.
The current full-automatic pressure testing machine is equipped with the servo motor as observing and controling the executive component, and its control system mainly includes driver, servo motor, control box, choke valve, gear pump, hydro-cylinder, thereby control system holds the load process through the loading of adjusting servo motor rotational speed control pressure testing machine, and it has the energy-conserving efficient advantage of silence, compares conventional digital valve system overall cost of observing and controlling and increases to some extent.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides a frequency conversion servo equipment for compression testing machine to solve the problem that exists among the prior art.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a frequency conversion servo device for a pressure tester comprises a computer, a control box, a motor, a throttle valve group, a frequency converter, a gear pump, an oil filter, a host, a sensor and an oil cylinder; wherein: the control box is communicated with the computer through Ethernet connection, receives and executes instructions of a computer program, is connected with the frequency converter, sends a rotating speed instruction for controlling the frequency converter and controls the frequency converter to stop/start, is connected with the sensor, supplies power to the sensor and receives signals from the sensor; the built-in switching-over valve that has the switching-over function that has of throttle valves, the throttle mouth of throttle valves is set for by manual regulation for realize high accuracy throttle effect and the oil return function among the pressure testing machine servo control process.
The utility model discloses a preferred embodiment, the gear pump passes through the motor drives, the gear pump passes through the pipeline control hydraulic oil flow direction the piston of hydro-cylinder, thereby it is right sensor and sample are exerted pressure for it holds lotus control and loading control to realize compression testing machine's high accuracy.
In a preferred embodiment of the present invention, a control board and a transformer are disposed in the control box.
The utility model discloses a preferred embodiment, the control mainboard includes main control chip circuit, power supply circuit, ethernet communication circuit, voltage acquisition circuit, displacement acquisition circuit, 485 communication circuit possesses isolation function, 485 communication circuit communicates with the converter, sends and receives the rotational speed signal who comes from the converter. The control box is also connected with the frequency converter through a hard wire and used for controlling the starting and stopping of the frequency converter.
The utility model provides a defect that exists among the background art, the utility model discloses possess following beneficial effect:
compared with a hydraulic control system adopting a digital valve, the utility model has the advantages of high mute energy-saving efficiency; compared with a hydraulic control system adopting a servo motor, the utility model has the advantages of simple structure of the hydraulic system and low cost of the frequency converter and the common motor; more than synthesizing, the utility model provides a hydraulic control system possesses: the loading and holding load is stable, the force value precision is high, the whole process is automatically controlled by a computer, the maximum loading pressure is high, and the device has the composite functions of loading, holding load, reversing and the like.
Drawings
The present invention will be further explained with reference to the drawings and examples;
FIG. 1 is a schematic diagram of a hydraulic system according to a preferred embodiment of the present invention;
in the figure: 1. a computer; 2. a control box; 3. a motor; 4. a throttle valve set; 5. a frequency converter; 6. a gear pump; 7. an oil filter; 8. a host; 9. a sensor; 10. and an oil cylinder.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and illustrate, by way of illustration only, the basic structure of the invention, and which therefore show only the constituents relevant to the invention.
As shown in fig. 1, a frequency conversion servo device for a pressure tester comprises a computer 1, a control box 2, a motor 3, a throttle valve group 4, a frequency converter 5, a gear pump 6, an oil filter 7, a host machine 8, a sensor 9 and an oil cylinder 10; wherein: the control box 2 communicates with the computer 1 through Ethernet connection, receives and executes instructions of a program of the computer 1, the control box 2 is connected with the frequency converter 5, sends a rotating speed instruction for controlling the frequency converter 5 and controls the stop/start of the frequency converter 5, the control box 2 is connected with the sensor 9, supplies power to the sensor 9 and receives signals from the sensor 9; the throttle valve group 4 is internally provided with a reversing valve with a reversing function, and a throttle opening of the throttle valve group 4 is manually adjusted and set so as to realize high-precision throttling effect and oil return function in the servo control process of the pressure testing machine.
In this embodiment, the standard sensor 9 is placed at the designated position of the piston of the oil cylinder 10 of the host machine 8, the sensor 9 and the control box 2 are connected, and the early-stage preparation work of the force value verification operation is completed. And (3) turning on a power supply of the motor 3 and the frequency converter 5, turning on the control box 2 and the computer 1, starting self-checking and initialization of the computer 1 measurement and control software and the control box 2, and preparing to enter the automatic power value verification process operation after the self-checking is passed.
Firstly, a first-stage control, namely an open-loop control stage is entered, a computer 1 issues a rotating speed instruction of a variable frequency motor 3, and a frequency converter 5 adjusts the motor 3 to a set open-loop rotating speed according to the rotating speed instruction requirement. In the stage, closed-loop control is not performed on the pressure, the control box 2 feeds back the acquired force value signal from the standard sensor 9 to the computer 1 in real time, and the computer 1 displays the force value signal on a software interface of the computer 1 in real time.
When the acquired force value reaches the inlet force, namely the first pressure value, indicating that the open-loop loading stage of the force is completed, the piston of the oil cylinder 10 is in contact with the standard sensor 9. The control box 2 enters the second stage, i.e. the first force loading stage, according to the preset inlet force value. The phase is a force loading phase, and the force first channel is subjected to closed-loop control. The control box 2 collects the force value from the standard sensor 9 in real time, carries out filtering processing on a force value signal, converts the force value signal into an actual force change rate value and a target force change rate value to carry out closed-loop control, and calculates the control instruction value of the variable frequency motor 3 in real time to adjust the rotating speed of the motor 3. The force loading rate can be set, and is generally set by measurement and control software on the computer 1 according to test requirements. The force loading closed-loop control parameters preset in the control box 2 are a key ring for ensuring the force loading performance, and the loading force value rate is adjusted in real time through a pressure adjusting system consisting of a frequency converter 5, a motor 3, a gear pump 6 and a throttle valve group 4.
When the difference between the collected force value signal and the first load-holding value target is less than a preset load buffering time, the first force value loading stage is indicated to enter a first force value loading buffering period. This stage is the end of the first force value loading stage, which reduces the actual force loading rate to the system minimum control rate by rapidly reducing the target loading rate. Through the operation of the buffer period, the loading speed is mainly reduced to the minimum speed as soon as possible, so that the system can stably enter a load-holding stage and the force value is ensured not to overshoot to the maximum extent. The preset loading buffer time and the minimum control speed are a pair of control contradictions, and the minimum control speed can be quickly and stably reached within the shortest buffer time through the optimization of the control algorithm, so that the high-efficiency operation efficiency is realized.
When the difference between the collected force value signal and the first load-holding value target is smaller than a preset force value interval, the first force value loading stage is ended, and then the first force value load-holding stage is started. At the moment, the first force channel is in closed-loop control, the control box 2 collects the actual force value and the target force value from the standard dynamometer in real time to perform closed-loop control, and the rotating speed value of the variable frequency motor 3 is calculated and issued in real time. The closed-loop control parameter of the force-bearing load preset in the control box 2 is a key ring for ensuring the high-precision performance of the force-bearing load.
When the first load-holding time reaches a preset time, the next stage is entered, generally, the loading and the load-holding are alternately carried out and are preset in a test and control software test project of the computer 1. Generally, when the maximum load-bearing force phase is completed, the hydraulic system unloading phase is entered when the force verification loading process is finished. In the unloading stage, the control box 2 controls the rotating speed of the variable frequency motor 3 to be zero.
Further, the gear pump 6 is driven by the motor 3, and the gear pump 6 controls hydraulic oil to flow to the piston of the oil cylinder 10 through a pipeline, so that pressure is applied to the sensor 9 and the sample, and high-precision load holding control and loading control of the pressure testing machine are achieved.
In this embodiment, a control main board and a transformer are provided in the control box 2.
Specifically, the control mainboard comprises a main control chip circuit, a power circuit, an Ethernet communication circuit, a voltage acquisition circuit, a displacement acquisition circuit and a 485 communication circuit, wherein the 485 communication circuit has an isolation function, and the 485 communication circuit is communicated with the frequency converter 5 and sends and receives a rotating speed signal from the frequency converter 5. The control box 2 is also connected with the frequency converter 5 through a hard wire and is used for controlling the starting and stopping of the frequency converter 5.
In a word, compared with a hydraulic control system adopting a digital valve, the utility model has the advantages of high mute energy-saving efficiency; compared with a hydraulic control system adopting the servo motor 3, the utility model has the advantages of simple structure of the hydraulic system and low cost of the frequency converter 5 and the common motor 3; more than synthesizing, the utility model provides a hydraulic control system possesses: the loading and holding load is stable, the force value precision is high, the whole process is automatically controlled by the computer 1, the maximum loading pressure is high, and the loading, holding load, reversing and other composite functions are realized.
In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A frequency conversion servo device for a pressure tester is characterized by comprising a computer, a control box, a motor, a throttle valve group, a frequency converter, a gear pump, an oil filter, a host, a sensor and an oil cylinder; wherein:
the control box is communicated with the computer through Ethernet connection, receives and executes instructions of a computer program, is connected with the frequency converter, sends a rotating speed instruction for controlling the frequency converter and controls the frequency converter to stop/start, is connected with the sensor, supplies power to the sensor and receives signals from the sensor;
the built-in switching-over valve that has the switching-over function that has of throttle valves, the throttle mouth of throttle valves is set for by manual regulation for realize high accuracy throttle effect and the oil return function among the pressure testing machine servo control process.
2. The frequency conversion servo device for the compression testing machine according to claim 1, wherein the gear pump is driven by the motor and controls hydraulic oil to flow to the piston of the oil cylinder through a pipeline, so as to apply pressure to the sensor and the sample, thereby realizing high-precision load holding control and loading control of the compression testing machine.
3. The variable frequency servo device for the compression testing machine according to claim 1, wherein a control main board and a transformer are arranged in the control box.
4. The frequency conversion servo device for the pressure testing machine according to claim 3, wherein the control main board comprises a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a voltage acquisition circuit, a displacement acquisition circuit and a 485 communication circuit, the 485 communication circuit has an isolation function, the 485 communication circuit is communicated with the frequency converter, and transmits and receives a rotating speed signal from the frequency converter, and the control box is further connected with the frequency converter through a hard wire and is used for controlling the starting and stopping of the frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022375249.4U CN214067656U8 (en) | 2020-10-22 | 2020-10-22 | Variable frequency servo equipment for pressure testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022375249.4U CN214067656U8 (en) | 2020-10-22 | 2020-10-22 | Variable frequency servo equipment for pressure testing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN214067656U true CN214067656U (en) | 2021-08-27 |
| CN214067656U8 CN214067656U8 (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022375249.4U Active CN214067656U8 (en) | 2020-10-22 | 2020-10-22 | Variable frequency servo equipment for pressure testing machine |
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|---|---|
| CN (1) | CN214067656U8 (en) |
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- 2020-10-22 CN CN202022375249.4U patent/CN214067656U8/en active Active
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| CN214067656U8 (en) | 2023-06-23 |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model |
Correction item: Inventor Correct: Lin Xiao|Chen Haisheng False: Lin Xiao|Chen Haisheng Number: 35-02 Page: The title page Volume: 37 Correction item: Inventor Correct: Lin Xiao|Chen Haisheng False: Lin Xiao|Chen Haisheng Number: 35-02 Volume: 37 |
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| CU01 | Correction of utility model | ||
| OR01 | Other related matters | ||
| OR01 | Other related matters |