CN114198368A - Control method of ultrahigh-pressure stretching pump station - Google Patents

Control method of ultrahigh-pressure stretching pump station Download PDF

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Publication number
CN114198368A
CN114198368A CN202111382822.7A CN202111382822A CN114198368A CN 114198368 A CN114198368 A CN 114198368A CN 202111382822 A CN202111382822 A CN 202111382822A CN 114198368 A CN114198368 A CN 114198368A
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China
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pressure
pump station
value
oil
ultrahigh
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Inventor
王兵
荣必贤
莫堃
邓超
周兴
伍珊
李琼
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Dongfang Electric Group Research Institute of Science and Technology Co Ltd
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Dongfang Electric Group Research Institute of Science and Technology Co Ltd
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Priority to CN202111382822.7A priority Critical patent/CN114198368A/en
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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
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a hydraulic control technology of a pump station, in particular to a control method of an ultrahigh-pressure stretching pump station, which can realize accurate boosting and safe pressure relief, and specifically comprises the following steps: the PLC calculates the opening value of the overflow valve, and sends the opening value to the overflow valve and adjusts the opening value; and controlling the servo motor to rotate at a rated rotating speed, and when the pressure reaches 85% -95% of the set pressure, decelerating the pump station and slowly raising the pump station to the set pressure value. When the output pressure reaches the set pressure, delaying for N seconds, enabling the pump station to enter a pressure maintaining state, dynamically executing pressure compensation, completing the bolt stretching and fastening process by the stretcher, slowly releasing pressure by the pump station, and starting to quickly release pressure by the pump station when the output pressure is less than or equal to 50%; the output pressure value of the hydraulic pump station is realized by adjusting the opening of the overflow valve in an analog quantity adjusting mode, so that the hydraulic pump station has the characteristics of wide pressure control range, high precision and the like, and adopts multi-stage speed control, thereby not only ensuring the boosting efficiency, but also ensuring the boosting stability.

Description

Control method of ultrahigh-pressure stretching pump station
Technical Field
The invention relates to a hydraulic control technology of a pump station, in particular to a control method of an ultrahigh-pressure stretching pump station, which can realize accurate boosting and safe pressure relief.
Background
The connection of large-scale spare part often needs great pretightning force, and this pretightning force is exerted mainly to tools such as hydraulic spanner or elongator at present, and the elongator is more reliable than hydraulic spanner pretensioning technology, and its theory of operation is that the tensile fastening of bolt is realized through elongator and the cooperation of super high pressure pump station. Whether a pump station can provide stable and reliable pressure or not is a key factor for determining the quality of the bolt stretching and fastening process. The pump station matched with the stretcher in the market at present comprises a manual pump station and an automatic pump station, wherein the automatic pump station has the characteristics of high control precision, good stability, simple operation and the like compared with the manual pump station. If application number is 201611112154.5, the name is super high pressure automatic stretching pump, this patent has realized the automatic control of super high pressure stretching pump station through the closed loop system that pressure transmitter and pilot solenoid valve formed, and its pressure control mainly switches the oil circuit through the switching of pilot solenoid valve, therefore hardly accomplishes the accurate control of pump station pressure. The ultrahigh-pressure pump station is driven by a high-speed motor mostly, so that the ultrahigh-pressure pump station has the characteristics of boosting and very rapid pressure reduction, a tension rod of the tension device is ensured to be smoothly screwed into a bolt needing to be stretched out for high-frequency working, the requirement on the hardness of the tension rod is high, the brittleness is also high, the pump station is broken due to overlarge reverse acting force at one moment of pressure release if the pump station does not have slow pressure release. Breakage of the tie rod may cause damage to the tensioner, thereby affecting work efficiency and possibly causing safety accidents in severe cases. Therefore, the automatic pump station not only has the function of quickly and accurately achieving the set pressure, but also has the functions of slowly releasing pressure and quickly releasing pressure.
Disclosure of Invention
In order to solve the problems in the prior art, a control method of an ultrahigh-pressure stretching pump station is provided, wherein the control method not only can accurately control output pressure, but also can realize pressure relief double-speed control.
In order to achieve the technical effects, the technical scheme of the application is as follows:
a control method of an ultrahigh-pressure stretching pump station comprises the following steps:
firstly, inputting parameter values of a pump station through an upper computer system by an operator according to the technological requirements of the stretched fastening bolt;
secondly, the PLC is used for calculating an opening value of the overflow valve according to a pump station pressure value sent by the upper computer and a real-time temperature value detected by a pump station oil tank, wherein the real-time temperature value is fed back by a temperature sensor, and the pressure control algorithm is a conventional technology; then controlling the opening of an overflow valve, testing the relation between the temperature and a set pressure value in different temperature intervals, then fitting a mathematical relational expression, and sending the mathematical relational expression to the overflow valve of the pump station in an analog quantity mode, wherein the overflow valve adjusts the opening value according to the obtained analog quantity value;
and thirdly, an operator clicks a boosting button through an upper computer, the PLC controls the servo motor to rotate according to the rated rotating speed, the boosting side of the electromagnetic valve is opened, the pump station starts boosting, and the hydraulic oil finally flows to the stretcher oil cylinder through the first oil way, the second oil way and the third oil way. When the pressure fed back by the pressure sensor of the third oil way reaches 85% -95% of the set pressure, preferably 90%, the PLC controls the pump station to decelerate, and the pump station slowly rises to the set pressure value.
Step four, delaying N seconds when the output pressure of the pump station reaches the set pressure, closing the boosting side of the electromagnetic valve, and enabling the pump station to enter a pressure maintaining state; in the pressure maintaining state, the stretcher starts to work, in the working process, if the pressure fed back by the pump station pressure sensor is lower than 95% -99% of the set pressure, the parameter can be adjusted in a program according to the actual precision requirement, the parameter can be set to be 99% for the occasions with higher precision requirement, the PLC dynamically adjusts the parameters of the overflow valve through a control algorithm, the parameters of the overflow valve are the same as the set values of the parameters of the overflow valve in the pressure increasing process, the parameters can be adjusted due to different temperatures, meanwhile, the pressure increasing side of the electromagnetic valve is opened, the pump station starts to supplement the pressure, when the set pressure is reached, the pressure increasing side of the electromagnetic valve is closed, and the pump station enters the pressure maintaining state again.
Step five, dynamically executing pressure compensation by the pump station in the pressure maintaining process until the stretcher finishes the bolt stretching and fastening process, recording the pressure value of the current pump station by an upper computer interface, then opening a reversing valve, returning hydraulic oil from an oil cylinder to an oil tank through a fifth oil way, slowly releasing pressure by the pump station, opening the pressure reducing side of an electromagnetic valve when the output pressure fed back by a pressure sensor is less than or equal to 50%, returning the hydraulic oil to the oil cylinder through a sixth oil way, and quickly releasing pressure by the pump station;
step six, when the pressure value fed back by the pressure sensor is smaller than the pressure value set for pressure relief completion, indicating that the pressure relief is completed, closing the pressure relief side of the electromagnetic valve and the reversing valve at the same time, and stopping the servo motor of the pump station;
and seventhly, finishing the stretching and fastening of one bolt, and carrying the stretcher to move to the next bolt to repeat the two-six rows of the steps for stretching and fastening again.
When the liquid level of the oil tank is too low, the electronic liquid level meter is triggered, a servo motor of a pump station stops rotating, and an upper computer sends an alarm signal to an operator;
similarly, when the filter is blocked due to excessive impurities in the hydraulic oil, the servo motor of the pump station stops rotating, and the upper computer sends an alarm signal to an operator;
when the pressure can not be released due to the electrical faults of the electromagnetic valve and the reversing valve, an operator can release the pressure through the manual pressure release valve.
Further, in the second step, the analog quantity is converted to the maximum opening degree to the minimum opening degree corresponding to the opening degree of the overflow valve corresponding to 0-10V.
Further, the parameter values in the first step include an overflow threshold value, a pressure set value, an approach rotating speed, a pressure supplementing rotating speed and a pressure supplementing proportion.
Further, the slow rise to the set pressure value in the third step means that the pump station decelerates to 80% of the rated rotating speed. This parameter can be adjusted in the program according to the actual operating conditions.
Further, N in the fourth step is 1-2.
Further, in the fifth step, slow pressure relief means that pressure is relieved to 50% of the set pressure within 1s, and fast pressure relief means that pressure relief is completed within 0.2.
Further, the dynamic pressure compensation in the fifth step means that before the bolt is stretched, when the pressure of the pump station is lower than the set proportion of the set pressure, the pump station always executes the dynamic pressure compensation process.
The invention has the advantages that:
1. the output pressure value of the hydraulic pump station is realized by adjusting the opening of the overflow valve in an analog quantity adjusting mode, so that the hydraulic pump station has the characteristics of wide pressure control range, high precision and the like, and adopts multi-stage speed control, thereby not only ensuring the boosting efficiency, but also ensuring the boosting stability.
2. According to the invention, the opening of the overflow valve is dynamically adjusted according to the change of the hydraulic oil temperature, so that the precision of the output pressure of a pump station is further ensured, and meanwhile, the process of pressure compensation is introduced, so that the consistency of the stretching force of the stretcher in the stretching process is further ensured.
3. In order to reduce reverse impact on the pull rod caused by instant pressure relief of a pump station, so that the pull rod of the stretcher is broken, the invention designs a mode of combining slow pressure relief and fast pressure relief, further prolongs the service life of the pull rod of the stretcher, and reduces the probability of accidents.
4. The invention has the function of data recording, the pressure value of the pump station is recorded at the moment when the tensioner pulls the nut, and the recorded value can reflect the actual pretightening force of the stretched fastening bolt.
Drawings
FIG. 1 is a block diagram of a hardware system of an ultra-high tension pump station.
Fig. 2 is a flow chart of the work of the ultra-high pressure stretching pump station.
Fig. 3 is a hydraulic schematic diagram of an ultrahigh pressure stretching pump station.
Fig. 4 is a front view of an extra-high tension pump station.
Fig. 5 is a left view of the ultra-high pressure stretching pump station.
FIG. 6 is a view of the ultra high pressure pump with the fuel tank removed.
In the figure, 1-oil tank, 2-electronic liquid level meter, 3-heater, 4-temperature sensor, 5-hydraulic pump, 6-filter, 7-radiator, 8-proportional overflow valve, 9-electromagnetic valve, 10-reversing valve, 11-first ultrahigh pressure hydraulic lock, 12-supercharger, 13-second ultrahigh pressure hydraulic lock, 14-throttle valve, 15-pointer pressure gauge, 16-pressure sensor, 17-stretcher, 18-manual pressure relief valve, 19-main control box, 20-first oil path, 21-second oil path, 22-third oil path, 23-fifth oil path, 24-sixth oil path, 25-fourth oil path, 26-seventh oil path, 27-servo motor, 28-pump station support, 29-valve seat.
Detailed Description
A control method of an ultrahigh-pressure stretching pump station comprises the following steps:
firstly, inputting parameter values of a pump station through an upper computer system by an operator according to the technological requirements of the stretched fastening bolt; the parameter values in the first step comprise an overflow threshold value, a pressure set value, an approach rotating speed, a pressure supplementing rotating speed and a pressure supplementing proportion.
Secondly, the PLC is used for calculating an opening value of the overflow valve according to a pump station pressure value sent by the upper computer and a real-time temperature value detected by a pump station oil tank 1, wherein the real-time temperature value is fed back by a temperature sensor 4, and the pressure control algorithm is a conventional technology; then controlling the opening of an overflow valve, testing the relation between the temperature and a set pressure value in different temperature intervals, then fitting a mathematical relational expression, and sending the mathematical relational expression to the overflow valve of the pump station in an analog quantity mode, wherein the overflow valve adjusts the opening value according to the obtained analog quantity value; in the second step, the analog quantity is converted to the maximum opening degree to the minimum opening degree corresponding to the opening degree of the overflow valve corresponding to 0-10V.
And step three, an operator clicks a boost button through an upper computer, the PLC controls the servo motor 27 to rotate according to the rated rotating speed, the boost side of the electromagnetic valve 9 is opened, the pump station starts boosting, hydraulic oil finally flows to the oil cylinder of the stretcher 17 through the first oil way 20, the second oil way 21 and the third oil way 22, and the 3 oil ways described herein only show the flow direction of the hydraulic oil during boosting to be distinguished, and the number of the oil ways is not limited. When the pressure fed back by the pressure sensor 16 of the third oil path 22 reaches 85% -95% of the set pressure, preferably 90%, the PLC controls the pump station to decelerate, and the pump station slowly rises to the set pressure value. The slow rise to the set pressure value in the third step means that the pump station decelerates to 80% of the rated rotating speed. This parameter can be adjusted in the program according to the actual operating conditions.
Step four, when the output pressure of the pump station reaches the set pressure, delaying for N seconds, closing the boosting side of the electromagnetic valve 9, and enabling the pump station to enter a pressure maintaining state; in a pressure maintaining state, the stretcher 17 starts to work, in the working process, if the pressure fed back by the pump station pressure sensor 16 is lower than 95% -99% of the set pressure, the parameter can be adjusted in a program according to the actual precision requirement, the parameter can be set to be 99% for the situation with higher precision requirement, the PLC dynamically adjusts the parameters of the overflow valve through a control algorithm, the parameters of the overflow valve in pressure compensation are the same as the set values of the parameters of the overflow valve in pressure boosting, the parameters can be adjusted due to different temperatures, meanwhile, the pressure boosting side of the electromagnetic valve 9 is opened, the pump station starts to supplement pressure, when the set pressure is reached, the pressure boosting side of the electromagnetic valve 9 is closed, and the pump station enters the pressure maintaining state again. In the fourth step, N is 1-2.
Step five, the pump station dynamically executes pressure compensation in the pressure maintaining process until the stretcher 17 finishes the bolt stretching and fastening process, the upper computer interface records the pressure value of the current pump station, then the reversing valve 10 is opened, hydraulic oil flows back to the oil tank 1 from the oil cylinder through the fifth oil way 23, the pump station starts to slowly release pressure, when the output pressure fed back by the pressure sensor 16 is less than or equal to 50%, the pressure reducing side of the electromagnetic valve 9 is opened, the hydraulic oil simultaneously flows back to the oil cylinder through the sixth oil way 24, and the pump station starts to quickly release pressure; the slow pressure relief refers to the pressure relief from 1s to 50% of the set pressure, and the quick pressure relief refers to the pressure relief completed by 0.2. The dynamic pressure compensation means that before the bolt is stretched, when the pressure of the pump station is lower than the set proportion of the set pressure, the pump station always executes the dynamic pressure compensation process.
Step six, when the pressure value fed back by the pressure sensor 16 is smaller than the pressure value set for pressure relief completion, indicating that the pressure relief is completed, closing the pressure relief side of the electromagnetic valve 9 and the reversing valve 10 at the same time, and stopping the pump station servo motor 27;
and seventhly, finishing the stretching and fastening of one bolt, and repeating the two-step to six-step stretching and fastening again before the stretcher 17 is conveyed to the next bolt.
When the liquid level of the oil tank 1 is too low, the electronic liquid level meter 2 is triggered, the servo motor 27 of the pump station stops rotating, and the upper computer sends an alarm signal to an operator;
similarly, when the filter 6 is blocked due to excessive impurities in the hydraulic oil, the servo motor 27 of the pump station stops rotating, and the upper computer sends an alarm signal to an operator;
when the pressure cannot be relieved due to the electrical faults of the electromagnetic valve 9 and the reversing valve 10, an operator can realize the pressure relief through the manual pressure relief valve 18.
A control method of an ultrahigh-pressure stretching pump station relates to control system hardware and comprises the following steps: the device comprises an upper computer system, an electric cabinet, a servo motor 27, a heater 3, a radiator 7, a pressure sensor 16, a temperature sensor 4, a proportional overflow valve 8, a reversing valve 10, an electromagnetic valve 9, a filter 6 and an electronic liquid level meter 2. This application is compared traditional pump station and has been introduced proportional overflow valve 8, has increased pressure adjustable range and regulation precision, introduces a plurality of slow pressure release of the same kind, can further improve pull rod life.
The upper computer system mainly comprises a touch screen and upper computer software, the upper computer software can check the working state of the current pump station in real time, the working state comprises a real-time temperature value and a real-time pressure value of the pump station, meanwhile, a tensile force value corresponding to each bolt is also recorded, and similarly, an operator can adjust system parameters through an upper computer interface so as to adjust the output pressure of the pump station and can manually realize the pressure boosting, pressure maintaining, slow pressure relief and fast pressure relief of the pump station;
the output pressure of the pump station is controlled mainly according to the pressure value fed back by the pressure sensor 16, and then the opening degree of the overflow valve is calculated through a control algorithm, so that the output pressure value of the pump station is controlled. In order to ensure the accuracy of the output pressure of the pump station, the servo motor 27 of the pump station adopts multi-stage speed control, the pump station operates at a rated speed at the initial stage of boosting, and the motor decelerates when the pump station reaches a set pressure, so that the pump station can be ensured to slowly reach the set pressure by the motor control mode, the service life of a pull rod of the stretcher 17 is prolonged, and the risk that the bolt is broken due to overpressure of the pump station caused by over-high rotating speed of the motor in the pressure supplementing process can be prevented; ' Qiyi
After the pump station continuously works, the oil temperature of an oil tank 1 of the pump station can rise, and the viscosity of hydraulic oil can be reduced along with the rise of the temperature, so that the output pressure of the pump station can be increased under the condition of the same opening degree of an overflow valve, therefore, a temperature sensor 4 is arranged in the oil tank 1 to monitor the change of the oil temperature of the oil tank 1 in real time, and transmit a temperature value to a PLC (programmable logic controller) in real time, and the PLC adjusts the opening degree value of the overflow valve in real time through a pressure control algorithm, so that the pressure value of the pump station can be accurately controlled at different temperatures;
in order to prevent the pump station from instantaneously releasing pressure to cause reverse impact on the tension rod of the stretcher 17, the pump station also adopts a mode of combining quick pressure release with slow pressure release. After the stretcher 17 is stretched and fastened, the reversing valve 10 is opened firstly, the pump station slowly releases pressure, when the pressure is reduced to 50% of the set pressure, the electromagnetic valve 9 releases the pressure, and the pump station quickly releases the pressure;
in order to prevent the risk brought to the normal use of the pump station because of too low hydraulic oil liquid level or too turbid oil of oil tank 1, some alarm sensors are added to the system, including electronic level gauge 2 and filter 6, when the hydraulic oil liquid level of oil tank 1 is too low, electronic level gauge 2 triggers to send alarm signal to the host computer, thereby when containing impurity in the hydraulic oil and leading to filter 6 to block up, filter 6 also can send alarm signal to the host computer.
As shown in fig. 1, when the oil temperature fed back by the temperature sensor 4 is higher than 35 ℃, the radiator 7 starts to operate.
As shown in fig. 3, which is a hydraulic schematic diagram of a pump station, when a boost button is not turned on after a pump station motor is started, the proportional overflow valve 8 is fully opened, and hydraulic oil flows through the filter 6, the first oil path 20, the second oil path 21, and finally flows through the proportional overflow valve 8 on the second oil path 21 and returns to the oil tank 1.
When the boost button is opened, the opening of the proportional overflow valve 8 is adjusted according to a set value, the electromagnetic valve 9 is opened, hydraulic oil flows through the electromagnetic valve 9, then flows through the third oil path 22, then flows through the first ultrahigh-pressure hydraulic lock 11, flows to the fourth oil path 25, respectively flows through the throttle valve 14, the supercharger 12 and the first ultrahigh-pressure hydraulic lock 11 on the fourth oil path 25, and finally flows to the oil cylinder of the stretcher 17; wherein the effect of first superhigh pressure hydraulic lock 11 and choke valve 14 prevents that hydraulic oil from flowing back to oil tank 1 when the pressure boost to lead to pressure unable rising, and the effect of second superhigh pressure hydraulic lock 13 is preventing that hydraulic oil from stretcher 17 hydro-cylinder backward flow, thereby influences the pressure value of tensile in-process.
When the slow pressure relief button is pressed down, the reversing valve 10 is opened, hydraulic oil flows from the oil cylinder of the stretcher 17 through the fifth oil path 23, then flows back to the oil tank 1 after being reversed through the reversing valve 10, when the fast pressure relief button is pressed down, the pressure reduction side of the electromagnetic valve 9 is opened, the electromagnetic valve 9 conducts the sixth oil path 24 with the seventh oil path 26, and the hydraulic oil flows through the oil path and finally flows through the radiator 7 to flow back to the oil tank 1;
when an electrical fault occurs, an operator can realize manual pressure relief through the manual pressure relief valve 18, so that the safety of a pump station is ensured;
as shown in fig. 4, 5 and 6, the electronic level gauge 2 is fixed to the upper cover of the tank 1; the heater 3 is fixed on a side plate of the oil tank 1; the temperature sensor 4 is fixed on the upper cover of the oil tank 1 and extends into the oil tank 1; the hydraulic pump 5 is fixed on the upper cover of the oil tank 1; the filter 6 is fixed on the left side of the pump station bracket 28 and is connected with the first oil way 20; the radiator 7 is fixed on the right side of the pump station bracket 28 and is connected with the seventh oil way 26; the proportional relief valve 8 is fixed to the valve seat 29 and connected to the second oil passage 21; the electromagnetic valve 9 is fixed on the valve support 29 and controls the on-off of the first oil path 20 and the third oil path 22, and also controls the on-off of the sixth oil path 24 and the seventh oil path 26; the reversing valve 10 is fixed on the upper cover of the oil tank 1 and is connected with the fifth oil path 23; the first ultrahigh-pressure hydraulic lock 11 is fixed on the upper cover of the oil tank 1 and is positioned between the third oil way 22 and the fourth oil way 25; the supercharger 12 is fixed on the upper cover of the oil tank 1 and is connected with the fourth oil path 25; the second ultrahigh-pressure hydraulic lock 13 is fixed on the upper cover of the oil tank 1 and is connected with a fifth oil way 23, a sixth oil way 24 and a seventh oil way 26; the throttle valve 14 is fixed in an oil path between the first ultrahigh-pressure hydraulic lock 11 and the supercharger 12; the pointer type pressure gauge 15 is fixed on the valve support 29; the pressure sensor 16 is fixed on the upper cover of the oil tank 1 and is positioned in an oil path between the supercharger 12 and the second ultrahigh-pressure hydraulic lock 13; the manual pressure relief valve 18 is fixed on the upper cover of the oil tank 1; the main control box 19 is fixed on the rear side of the pump station bracket 28; the servo motor 27 is connected with the hydraulic pump 5; the pump station bracket 28 is connected with the oil tank 1; the valve seat 29 is fixed to the upper cover of the fuel tank 1.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper", "vertical", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally arranged when products of the application are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Claims (10)

1. A control method of an ultrahigh-pressure stretching pump station is characterized by comprising the following steps:
step one, inputting parameter values of a pump station through an upper computer system according to the technological requirements of a stretched fastening bolt;
secondly, the PLC calculates an opening value of an overflow valve through a pressure control algorithm according to a pump station pressure value sent by the upper computer and a real-time temperature value detected by a pump station oil tank, and sends the opening value to the overflow valve of the pump station in an analog quantity mode, and the overflow valve adjusts the opening value according to the obtained analog quantity value;
clicking a boosting button through an upper computer, controlling a servo motor to rotate at a rated rotating speed by a PLC (programmable logic controller), starting a boosting side of an electromagnetic valve, boosting the pressure of a pump station, and finally enabling hydraulic oil to flow to an oil cylinder of a stretcher through a first oil way, a second oil way and a third oil way;
step four, delaying N seconds when the output pressure of the pump station reaches the set pressure, closing the boosting side of the electromagnetic valve, and enabling the pump station to enter a pressure maintaining state; in the pressure maintaining state, the stretcher starts to work, in the working process, if the pressure fed back by the pump station pressure sensor is lower than 95% -99% of the set pressure, the PLC dynamically adjusts the parameters of the overflow valve through a control algorithm, meanwhile, the pressure increasing side of the electromagnetic valve is opened, the pump station starts to supplement the pressure, when the set pressure is reached, the pressure increasing side of the electromagnetic valve is closed, and the pump station enters the pressure maintaining state again;
step five, dynamically executing pressure compensation by the pump station in the pressure maintaining process until the stretcher finishes the bolt stretching and fastening process, recording the pressure value of the current pump station by an upper computer interface, then opening a reversing valve, returning hydraulic oil from an oil cylinder to an oil tank through a fifth oil way, slowly releasing pressure by the pump station, opening the pressure reducing side of an electromagnetic valve when the output pressure fed back by a pressure sensor is less than or equal to 50%, returning the hydraulic oil to the oil cylinder through a sixth oil way, and quickly releasing pressure by the pump station;
step six, when the pressure value fed back by the pressure sensor is smaller than the pressure value set for pressure relief completion, indicating that the pressure relief is completed, closing the pressure relief side of the electromagnetic valve and the reversing valve at the same time, and stopping the servo motor of the pump station;
and seventhly, finishing the stretching and fastening of one bolt, and carrying the stretcher to move to the next bolt to repeat the two-six rows of the steps for stretching and fastening again.
2. The method for controlling the ultrahigh-pressure stretching pump station according to claim 1, wherein when the liquid level of the oil tank is too low, the electronic liquid level meter is triggered, the servo motor of the pump station stops rotating, and the upper computer sends out an alarm signal.
3. The method for controlling the ultrahigh-pressure stretching pump station according to claim 1, wherein when the filter is blocked due to excessive impurities in the hydraulic oil, the servo motor of the pump station stops rotating, and the upper computer sends out an alarm signal.
4. The method for controlling the ultrahigh-pressure stretching pump station according to claim 1, wherein when the pressure cannot be released due to the electrical failure of the electromagnetic valve and the reversing valve, the pressure is released through a manual pressure release valve.
5. The method for controlling the ultrahigh-pressure stretch pump station according to claim 1, wherein in the second step, the analog quantity is converted to the overflow valve opening corresponding to the maximum opening to the minimum opening corresponding to 0-10V.
6. The method for controlling the ultrahigh pressure stretching pump station according to claim 1, wherein the parameter values in the first step comprise an overflow threshold value, a pressure set value, an approach rotating speed, a pressure supplementing rotating speed and a pressure supplementing proportion.
7. The method for controlling the ultrahigh-pressure stretching pump station according to claim 1, wherein the slow rise to the set pressure value in the third step is that the pump station is decelerated to 80% of the rated rotation speed.
8. The method for controlling the ultrahigh pressure stretch pump station according to claim 1, wherein N is 1-2 in the fourth step.
9. The method for controlling the ultrahigh-pressure stretch pump station according to claim 1, wherein in the fifth step, slow pressure relief refers to pressure relief from 1s to 50% of the set pressure, and fast pressure relief refers to pressure relief completed by 0.2.
10. The method for controlling the ultra-high pressure stretch pump station according to claim 1, wherein the dynamic pressure compensation in the step five means that before the bolt stretch is completed, when the pressure of the pump station is lower than the set ratio of the set pressure, the pump station always performs the dynamic pressure compensation process.
CN202111382822.7A 2021-11-22 2021-11-22 Control method of ultrahigh-pressure stretching pump station Pending CN114198368A (en)

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CN106736480A (en) * 2016-12-31 2017-05-31 马鞍山市三江机械有限公司 A kind of hydraulic elongator and its drawing process
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CN113043002A (en) * 2021-02-24 2021-06-29 东方电气集团科学技术研究院有限公司 Automatic bolt stretching and fastening system and method
CN113295538A (en) * 2021-05-31 2021-08-24 山西互昇科技有限公司 Pressure regulating method of hydrostatic testing machine
CN214247829U (en) * 2021-01-06 2021-09-21 无锡上研液压有限公司 Hydraulic slow-release system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008093792A (en) * 2006-10-12 2008-04-24 Kurashiki Kako Co Ltd Automatic tightening device
JP2011073105A (en) * 2009-09-30 2011-04-14 Fujitsu Peripherals Ltd Management method and device of screwing-in quantity of screw
CN106736480A (en) * 2016-12-31 2017-05-31 马鞍山市三江机械有限公司 A kind of hydraulic elongator and its drawing process
CN214247829U (en) * 2021-01-06 2021-09-21 无锡上研液压有限公司 Hydraulic slow-release system
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Application publication date: 20220318