CN114459741A - Off-line calibration method for mechanical flyweight of pneumatic pump - Google Patents
Off-line calibration method for mechanical flyweight of pneumatic pump Download PDFInfo
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Abstract
The invention relates to the field of nuclear power equipment, in particular to an off-line calibration method for a mechanical flyweight of a pneumatic pump. The method comprises the steps of respectively carrying out stability verification and installation depth calibration on the mechanical flyweight for the test, wherein the stability verification comprises the following steps: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; respectively testing the rotating speed of the mechanical flyweight when the rotating speed reaches 9675rpm for 2-3 times and the rotating speed during tripping, and comparing and analyzing the accuracy of the action of the mechanical flyweight; the depth calibration comprises the following steps: adjusting the trip values of the mechanical flyweight to 9675rpm and 9850rpm respectively, and measuring and recording the installation depth of the mechanical flyweight at the moment respectively; the mounting depth obtained by the two tests is the upper and lower limits of the calibration depth of the mechanical flyweight. The method does not occupy the main line construction period of the unit overhaul, verifies the action stability of the mechanical flyweight in advance, calibrates the installation depth of the flyweight through the verification device, and ensures that the online test is qualified at one time.
Description
Technical Field
The invention relates to the field of nuclear power equipment, in particular to an off-line calibration method for a mechanical flyweight of a pneumatic pump.
Background
The steam-driven auxiliary water feeding pump is a nuclear safety facility specially designed for a nuclear power plant, and a mechanical overspeed test is required to be implemented during each cycle of overhaul according to the current nuclear safety supervision requirement. At present, the test needs to be implemented in the real operation process of the pump set, the rotating speed of the pump set needs to reach 9675 and 9850rpm, and therefore, a window of a thermal stop platform of the pump set needs to be occupied.
Because the limitation of a test window and the stability of the mechanical flyweight before the test cannot be predicted, the probability of one-time unqualified test is high, the adjustment process of the action value of the mechanical flyweight is found out by experience, and the adjustment uncertainty factor is large, so that the influence on the construction period of a major overhaul line is great, and the influence on the economy of a unit is formed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for off-line calibration of the mechanical flyweight of the pneumatic pump does not occupy the construction period of the major overhaul line of the unit, the action stability of the mechanical flyweight is calibrated on an off-line high-speed test bed in advance, the installation depth of the flyweight is calibrated through a calibration device, the on-line test is qualified at one time, and the influence on the construction period of the major overhaul line is avoided.
The invention provides an off-line calibration method for a mechanical flyweight of a pneumatic pump, which is used for respectively carrying out stability calibration and installation depth calibration on the mechanical flyweight for test, wherein the respectively carrying out stability calibration on the mechanical flyweight for test comprises the following steps:
step S1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
step S2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
step S3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min; when 9675rpm is reached, controlling the speed rising rate of 300-350 rpm/min until the mechanical flyweight triggers, pushing the T-shaped plate to rotate clockwise and separate from the hook head of the hanging buckle, finally separating the limit switch from the reset rod, and triggering a limit opening signal;
step S4: repeating the steps 2-3 for 2 times;
step S5: respectively reading and recording the rotating speed of each tripping from the PLC, and comparing and analyzing the accuracy of the mechanical flyweight action;
the mechanical flyweight installation depth calibration for the test comprises the following steps:
step A1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
step A2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
step A3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min; adjusting the trip values of the mechanical flyweight to 9675rpm and 9850rpm respectively, and measuring and recording the installation depth of the mechanical flyweight at the moment respectively;
the mounting depth obtained by the two tests is the upper and lower limits of the calibration depth of the mechanical flyweight.
Preferably, in step S1, after the cooling water is injected, the overspeed protection shutdown value is set by the PLC controller, that is, when the rotation speed is increased to 10000rpm, a shutdown signal is automatically triggered, and the inverter motor is powered off.
Preferably, in the step S2,
and starting the variable frequency motor, simulating the real starting condition of the pump set, increasing the rotating speed to 8000rpm within 4s, and stably operating for 5 min.
Preferably, in the step S3, the acceptance interval is 9675 to 9850 rpm.
Preferably, in step S3, before the rotation speed reaches the acceptance interval, the rotation speed is slowly increased at a rate of 1200 rpm/min; when 9675rpm is reached, the speed rising rate of 300rpm/min is controlled until the flyweight triggers, the T-shaped plate is pushed to rotate clockwise and is separated from the hook head of the hanging buckle, and finally the limit switch is separated from the reset rod to trigger a limit opening signal.
Preferably, in step S5, the deviation of the rotation speed during three trips does not exceed 1% of the average value, and no trend of monotonic increase or monotonic decrease occurs, so that the mechanical flyweight is qualified.
Preferably, the off-line calibration device of the pneumatic pump mechanical flyweight comprises an emergency hanging buckle assembly, a water chamber, a variable frequency motor and a test bed base;
the test bed base is fixedly connected with the water chamber and the variable frequency motor in sequence;
the critical buckle component comprises: the T-shaped plate is rotatably arranged on one side of the crisis hanging buckle shell, the manual stop racket rod is horizontally arranged, and the T-shaped plate is connected with one end of the manual stop racket rod through a spring; the hook head is positioned below the manual shutdown racket rod, one end of the hook head is clamped with the bottom end of the T-shaped plate, and the other end of the hook head is rotatably arranged on the crisis hanging buckle shell; one end of the reset rod is connected with the hook head, and when the reset rod is lifted, the hook head is matched with the T-shaped plate in a hanging and buckling mode; the manual shutdown racket rod is sleeved in a guide hole of a cover plate of the emergency hanging buckle shell, is provided with a pre-tightening spring and always keeps thrust to the right side so as to realize reset; when the racket rod is manually pushed to be manually stopped, the T-shaped plate can be separated from the hook head of the hook, and manual tripping is realized; the emergency hanging buckle shell cover plate is connected with the emergency hanging buckle shell through a bolt, and a sealing gasket is arranged between the emergency hanging buckle shell cover plate and the emergency hanging buckle shell; the limit switch is fixed on the limit switch bracket, and the limit switch bracket is fixed on the side part of the test bed base; when the T-shaped plate is in hanging buckle fit with the hook head of the hook, the limit switch is contacted with the reset rod and outputs a signal;
one side wall of the water chamber is provided with an opening, the T-shaped plate and the hook head part of the hook extend into the water chamber, and two ends of the crisis hanging buckle shell are connected with the side wall of the water chamber;
the top cover is arranged at the top of the water chamber and is connected with the water chamber through bolts;
the rotating speed probe is arranged on a threaded hole of the water chamber, the rotating speed probe and the water chamber realize a sealing function through an O-shaped sealing ring, and after the rotating speed probe is arranged in place, the center of the rotating speed probe is flush with the center of the test dummy shaft and is opposite to a magnetic part of the test dummy shaft, so that magnetic induction is realized;
the non-driving end bearing chamber and the driving end bearing chamber are horizontally and symmetrically arranged on the side wall of the water chamber, the non-driving end bearing chamber and an inner hole of the driving end bearing chamber are concentric, the test dummy shaft penetrates through the non-driving end bearing chamber and the driving end bearing chamber, and the driving end of the test dummy shaft is arranged on the side of the driving end bearing chamber;
the shaft extension end of the test dummy shaft and the shaft extension end of the variable frequency motor are connected and driven through a coupler;
the directions of the central lines of the shaft and the hole of the test dummy shaft, the non-drive-end bearing chamber, the coupling and the variable frequency motor are consistent and aligned.
Preferably, the T-shaped plate is mounted on the crisis hanging buckle shell through a pin shaft and can rotate by taking the pin shaft as a center; the hook head is arranged on the crisis buckle shell through a pin shaft and can rotate by taking the pin shaft as a center.
Preferably, the test bed further comprises a coupler shield, wherein the coupler shield is installed on the test bed base through screws and covers the coupler, and therefore rotating parts are protected.
Preferably, the limit switch, the rotating speed probe and the variable frequency motor are all connected to an operation platform, and the operation control is realized through a PLC (programmable logic controller).
Compared with the prior art, the off-line calibration method for the mechanical flyweight of the steam-driven pump provided by the invention has the advantages that the action stability of the mechanical flyweight is calibrated on an off-line high-speed test bed, the rotating speed can be accurately adjusted, and the real-time monitoring of the action value of the flyweight is realized; the installation depth of the flyweight on the dummy shaft can be calibrated, and a technical reference basis is provided for field installation. The stability of the mechanical flyweight after verification can be guaranteed, the actual installation depth of the mechanical flyweight on site can be predetermined through a verification device, and the condition that a subsequent pump set overspeed test is qualified at one time is guaranteed. In addition, the checking process does not occupy the major line construction period of the unit overhaul, and the influence on the major line construction period of the overhaul is avoided.
Drawings
FIG. 1 is a schematic view of a critical buckle assembly;
FIG. 2 is a schematic view of the assembly of the water chamber and the emergency buckle assembly;
FIG. 3 is a schematic view of a verification device;
in the figure, the position of the first and second end faces,
the test device comprises a test flyweight mounting position 1, a T-shaped plate 2, an emergency hanging buckle shell 3, a spring 4, a manual shutdown racket rod 5, a limit switch 6, a test dummy shaft 7, a hanging buckle hook 8, an emergency hanging buckle shell cover plate 9, a reset rod 10, a limit switch support 11, a test bed base 12, a water chamber 13, a water chamber cover plate 14, a rotating speed probe 15, a non-driving-end bearing chamber 16, a driving-end bearing chamber 17, a coupler 18, a coupler shield 19 and a variable frequency motor 20.
Detailed Description
For a further understanding of the invention, embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate features and advantages of the invention, and are not intended to limit the invention.
The embodiment of the invention discloses an off-line calibration method for a mechanical flyweight of a pneumatic pump, which is used for respectively carrying out stability calibration and installation depth calibration on the mechanical flyweight for test, wherein the respectively carrying out stability calibration on the mechanical flyweight for test comprises the following steps:
step S1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
step S2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of a checking device, and further increasing the rotating speed after confirming that no abnormity exists;
step S3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min; when 9675rpm is reached, controlling the speed rising rate of 300-350 rpm/min until the flyweight triggers, pushing the T-shaped plate to rotate clockwise and separate from the hook head of the hanging buckle, finally separating the limit switch from the reset rod, and triggering a limit opening signal;
step S4: repeating the steps 2-3 for 2 times;
step S5: respectively reading the rotating speed of each tripping from the PLC, recording, and comparing and analyzing the accuracy of the mechanical flyweight action;
the mechanical flyweight installation depth calibration for the test comprises the following steps:
step A1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
step A2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
step A3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min; adjusting the trip values of the mechanical flyweight to 9675rpm and 9850rpm respectively, and measuring and recording the installation depth of the mechanical flyweight at the moment respectively;
the mounting depth obtained by the two tests is the upper and lower limits of the calibration depth of the mechanical flyweight.
The method provided by the invention is matched with an offline checking device to realize offline checking of the mechanical flyweight. The off-line calibration device simulates the field water environment, the mechanical flyweight is arranged on the dummy shaft, and the size of the dummy shaft is required to be consistent with the design size of the pump shaft. The input end of the dummy shaft is connected with an external variable frequency motor, and the variable frequency motor can realize stepless speed regulation at the rotating speed of 0-10000 rpm. The calibration device is provided with a rotating speed measuring device and a flyweight action monitoring device, and can realize the function of recording the action rotating speed of the flyweight.
When the mechanical flyweights for the test are subjected to stability verification respectively:
step S1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; the mechanical flyweight is arranged perpendicular to the axial lead of the test dummy shaft, and the action direction of the test flyweight is perpendicular to the axial lead of the test dummy shaft; the mounting mode of the pump shaft is consistent with that of the pump shaft of the steam driven pump;
starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
after cooling water is injected, an overspeed protection shutdown value is set through a PLC (programmable logic controller), namely a shutdown signal is automatically triggered when the rotating speed is increased to 10000rpm, and the variable frequency motor is powered off.
Step S2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
specifically, the variable frequency motor is started, the real starting condition of the pump set is simulated, the rotating speed is increased to 8000rpm within 4s, the pump set stably runs for 5min, the running condition of the checking device is observed, and the rotating speed can be further increased after the condition that no abnormality exists is confirmed.
Step S3: before the rotating speed reaches an acceptance interval, the acceptance interval is 9675-9850rpm, and the rotating speed is slowly increased at the speed of 1100-1300 rpm/min; when 9675rpm is reached, controlling the speed rising rate of 300-350 rpm/min until the flyweight triggers, pushing the T-shaped plate to rotate clockwise and separate from the hook head of the hanging buckle, finally separating the limit switch from the reset rod, and triggering a limit opening signal;
specifically, before the rotating speed reaches the acceptance interval, the rotating speed is slowly increased at the speed of 1200 rpm/min; when 9675rpm is reached, the speed rising rate of 300rpm/min is controlled until the flyweight triggers, the T-shaped plate is pushed to rotate clockwise and is separated from the hook head of the hanging buckle, and finally the limit switch is separated from the reset rod to trigger a limit opening signal.
Step S4: repeating the steps 2-3 for 2 times;
step S5: respectively reading the rotating speed of each tripping from the PLC, recording, and comparing and analyzing the accuracy of the mechanical flyweight action;
the rotating speed deviation in three-time tripping is not more than 1% of the average value, and the trend of monotonous increase or monotonous decrease does not appear, so that the mechanical flyweight is qualified.
When the installation depth of the mechanical flyweight for the test is calibrated:
step A1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; the mechanical flyweight is arranged perpendicular to the axial lead of the test dummy shaft, and the action direction of the test flyweight is perpendicular to the axial lead of the test dummy shaft; the mounting mode of the pump shaft is consistent with that of the pump shaft of the steam driven pump;
starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
after cooling water is injected, an overspeed protection shutdown value is set through a PLC (programmable logic controller), namely a shutdown signal is automatically triggered when the rotating speed is increased to 10000rpm, and the variable frequency motor is powered off.
Step A2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
specifically, the variable frequency motor is started, the real starting condition of the pump set is simulated, the rotating speed is increased to 8000rpm within 4s, the pump set stably runs for 5min, the running condition of the checking device is observed, and the rotating speed can be further increased after the condition that no abnormality exists is confirmed.
Step A3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min, preferably 1200 rpm/min; adjusting the trip values of the mechanical flyweight to 9675rpm and 9850rpm respectively, and measuring and recording the installation depth of the mechanical flyweight at the moment respectively;
the mounting depth obtained by the two tests is the upper and lower limits of the calibration depth of the mechanical flyweight.
In the invention, as shown in fig. 1-3, the off-line calibration device of the pneumatic pump mechanical flyweight comprises a critical hanging buckle assembly, a water chamber 13, a variable frequency motor 20 and a test bed base 12;
the test bed base 12 is fixedly connected with a water chamber 13 and a variable frequency motor 20 in sequence;
the critical buckle subassembly includes: the T-shaped plate 2 is rotatably arranged on one side of the crisis hanging buckle shell 3, preferably, the T-shaped plate 2 is arranged on the crisis hanging buckle shell 3 through a pin shaft and can rotate by taking the pin shaft as a center;
the manual stop racket rod 5 is horizontally arranged, and the T-shaped plate 2 is connected with one end of the manual stop racket rod 5 through a spring 4; the hook head 8 is positioned below the manual shutdown racket rod 5, one end of the hook head 8 is clamped with the bottom end of the T-shaped plate 2, and the other end of the hook head 8 is rotatably arranged on the crisis hanging buckle shell 3; preferably, the hook head 8 is mounted on the crisis buckle housing 3 through a pin shaft and can rotate around the pin shaft;
the spring 4 is arranged in the crisis hanging buckle shell 3, provides pretightening force for the T-shaped plate 2, provides anticlockwise thrust for the T-shaped plate 2, and is convenient for resetting the hanging buckle;
one end of the reset rod 10 is connected with the hook head 8, preferably, the hook head 8 is connected with the reset rod 10 through a positioning pin, and when the reset rod 10 is lifted, the hook head 8 is in hanging and buckling fit with the T-shaped plate 2;
the manual shutdown racket rod 5 is sleeved in a guide hole of a critical hanging buckle shell cover plate 9 and is provided with a pre-tightening spring, and the pushing force towards the right side is always kept to realize resetting; when the clapper 5 is manually pushed to be manually stopped, the T-shaped plate 2 can be separated from the hook head 8, and manual tripping is realized;
the emergency hanging buckle shell cover plate 9 is connected with the emergency hanging buckle shell 3 through a bolt, and a sealing gasket is arranged between the emergency hanging buckle shell cover plate and the emergency hanging buckle shell 3;
the limit switch 6 is fixed on the limit switch bracket 7, and the limit switch bracket 7 is fixed on the side part of the test bed base 12; when the T-shaped plate 2 is in hanging buckle fit with the hook head 8, the limit switch 6 is in contact with the reset rod 10 and outputs a signal;
one side wall of the water chamber 13 is provided with an opening, the T-shaped plate 2 and the hook 8 partially extend into the water chamber 13, and two ends of the crisis hanging buckle shell 3 are connected with the side wall of the water chamber 13;
a top cover 14 is arranged at the top of the water chamber 13, the top cover 14 is connected with the water chamber 13 through bolts, and preferably, a sealing gasket is arranged between the top cover 14 and the water chamber 13; the internal components of the water chamber 13 can be viewed from directly above after the top cover 14 is removed, and the mechanical flyweight 1 can be adjusted.
The rotating speed probe 15 is installed on a threaded hole of the water chamber 13, the rotating speed probe 15 and the water chamber 13 realize a sealing function through an O-shaped sealing ring, and after the rotating speed probe 15 is installed in place, the center of the rotating speed probe 15 is flush with the center of the test dummy shaft 7 and is opposite to the magnetic part of the test dummy shaft 7, so that magnetic induction is realized;
the non-driving end bearing chamber 16 and the driving end bearing chamber 17 are horizontally and symmetrically arranged on the side wall of the water chamber 13, preferably, the non-driving end bearing chamber and the driving end bearing chamber are connected with the water chamber 13 through bolts, and a sealing gasket is arranged in the middle;
the non-driving end bearing chamber 16 is concentric with an inner hole of the driving end bearing chamber 17, the test dummy shaft 7 penetrates through the non-driving end bearing chamber 16 and the driving end bearing chamber 17, and a driving end of the test dummy shaft 7 is arranged on the side of the driving end bearing chamber 17;
the shaft extension end of the test dummy shaft 7 and the shaft extension end of the variable frequency motor 20 are connected and driven through a coupler 18;
the directions of the central lines of the shaft and the hole of the test dummy shaft 7, the non-drive-end bearing chamber 16, the drive-end bearing chamber 17, the coupling 18 and the variable frequency motor 20 are consistent and aligned.
Preferably, the test bed further comprises a coupling shield 19, wherein the coupling shield 19 is installed on the test bed base 12 through screws and covers the coupling 18, so that the rotating parts are protected.
The limit switch 6, the rotating speed probe 15 and the variable frequency motor 20 are all connected to an operation platform, and the operation control is realized through a PLC.
When in test, the mechanical flyweight 1 is embedded in the test dummy shaft 7, the mechanical flyweight 1 is installed perpendicular to the axial lead of the test dummy shaft 7, and the action direction of the mechanical flyweight 1 is perpendicular to the axial lead of the test dummy shaft 7 and is consistent with the installation mode of the mechanical flyweight on the pump shaft of the pneumatic pump.
After the stability of the mechanical flyweight is verified to be qualified by the verifying device, the mechanical flyweight is installed on the pump shaft according to the standard, one-time qualification of a mechanical overspeed test of the pneumatic pump can be realized, the adjusting time of the flyweight on the pump shaft is saved, and the test period is shortened.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The off-line calibration method for the mechanical flyweights of the pneumatic pumps is characterized in that stability calibration and installation depth calibration are respectively carried out on the mechanical flyweights for the test, wherein the stability calibration respectively carried out on the mechanical flyweights for the test comprises the following steps:
step S1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
step S2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
step S3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min; when 9675rpm is reached, controlling the speed rising rate of 300-350 rpm/min until the mechanical flyweight triggers, pushing the T-shaped plate to rotate clockwise and separate from the hook head of the hanging buckle, finally separating the limit switch from the reset rod, and triggering a limit opening signal;
step S4: repeating the steps 2-3 for 2 times;
step S5: respectively reading the rotating speed of each tripping from the PLC, recording, and comparing and analyzing the accuracy of the mechanical flyweight action;
the mechanical flyweight installation depth calibration for the test comprises the following steps:
step A1: mounting a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device of the mechanical flyweight of the pneumatic pump; starting cooling water, injecting the cooling water into the water chamber and forming forced circulation;
step A2: starting a variable frequency motor, simulating the real starting condition of a pump set, stably running, observing the running condition of the checking device, and further increasing the rotating speed after confirming that no abnormality exists;
step A3: before the rotating speed reaches the acceptance interval, slowly increasing the rotating speed at the speed of 1100-1300 rpm/min; adjusting the trip values of the mechanical flyweight to 9675rpm and 9850rpm respectively, and measuring and recording the installation depth of the mechanical flyweight at the moment respectively;
the mounting depth obtained by the two tests is the upper and lower limits of the calibration depth of the mechanical flyweight.
2. The off-line calibration method for the mechanical flyweight of the steam-driven pump according to claim 1, wherein in step S1, after the cooling water is injected, an overspeed protection shutdown value is set through a PLC controller, that is, when the rotation speed is increased to 10000rpm, a shutdown signal is automatically triggered, and the inverter motor is powered off.
3. The off-line verification method for the mechanical flyweight of the steam-driven pump according to claim 1, wherein in step S2,
and starting the variable frequency motor, simulating the real starting condition of the pump set, increasing the rotating speed to 8000rpm within 4s, and stably operating for 5 min.
4. The off-line verification method for the mechanical flyweight of the steam-driven pump according to claim 1, wherein in the step S3, the acceptance interval is 9675-9850 rpm.
5. The off-line verification method for the mechanical flyweight of the steam-driven pump according to claim 1, wherein in step S3, before the rotation speed reaches the acceptance interval, the rotation speed is slowly increased at a rate of 1200 rpm/min; when 9675rpm is reached, the speed rising rate of 300rpm/min is controlled until the flyweight triggers, the T-shaped plate is pushed to rotate clockwise and is separated from the hook head of the hanging buckle, and finally the limit switch is separated from the reset rod to trigger a limit opening signal.
6. The off-line verification method for the mechanical flyweight of the steam-driven pump according to claim 1, wherein in step S5, the deviation of the rotation speed when three trips does not exceed 1% of the average value, and no trend of monotonous increase or monotonous decrease occurs, and the mechanical flyweight is qualified.
7. The off-line calibration method for the mechanical flyweight of the steam-driven pump according to claim 1, wherein the off-line calibration device for the mechanical flyweight of the steam-driven pump consists of a critical hanging buckle assembly, a water chamber, a variable frequency motor and a test bed base;
the test bed base is fixedly connected with the water chamber and the variable frequency motor in sequence;
the critical buckle subassembly includes: the T-shaped plate is rotatably arranged on one side of the crisis hanging buckle shell, the manual stop racket rod is horizontally arranged, and the T-shaped plate is connected with one end of the manual stop racket rod through a spring; the hook head is positioned below the manual shutdown racket rod, one end of the hook head is clamped with the bottom end of the T-shaped plate, and the other end of the hook head is rotatably arranged on the crisis hanging buckle shell; one end of the reset rod is connected with the hook head, and when the reset rod is lifted, the hook head is matched with the T-shaped plate in a hanging and buckling mode; the manual shutdown racket rod is sleeved in a guide hole of a cover plate of the emergency hanging buckle shell, is provided with a pre-tightening spring and always keeps thrust to the right side so as to realize reset; when the racket rod is manually pushed to be manually stopped, the T-shaped plate can be separated from the hook head of the hook, and manual tripping is realized; the emergency hanging buckle shell cover plate is connected with the emergency hanging buckle shell through a bolt, and a sealing gasket is arranged between the emergency hanging buckle shell cover plate and the emergency hanging buckle shell; the limit switch is fixed on the limit switch bracket, and the limit switch bracket is fixed on the side part of the test bed base; when the T-shaped plate is in hanging buckle fit with the hook head of the hook, the limit switch is contacted with the reset rod and outputs a signal;
one side wall of the water chamber is provided with an opening, the T-shaped plate and the hook head part of the hook extend into the water chamber, and two ends of the crisis hanging buckle shell are connected with the side wall of the water chamber;
the top cover is arranged at the top of the water chamber and is connected with the water chamber through bolts;
the rotating speed probe is arranged on a threaded hole of the water chamber, the rotating speed probe and the water chamber realize a sealing function through an O-shaped sealing ring, and after the rotating speed probe is arranged in place, the center of the rotating speed probe is flush with the center of the test dummy shaft and is opposite to a magnetic part of the test dummy shaft, so that magnetic induction is realized;
the non-driving end bearing chamber and the driving end bearing chamber are horizontally and symmetrically arranged on the side wall of the water chamber, the non-driving end bearing chamber and an inner hole of the driving end bearing chamber are concentric, the test dummy shaft penetrates through the non-driving end bearing chamber and the driving end bearing chamber, and the driving end of the test dummy shaft is arranged on the side of the driving end bearing chamber;
the shaft extension end of the test dummy shaft and the shaft extension end of the variable frequency motor are connected and driven through a coupler;
the directions of the central lines of the shaft and the hole of the test dummy shaft, the non-drive-end bearing chamber, the coupling and the variable frequency motor are consistent and aligned.
8. The off-line calibration method for the mechanical flyweight of the pneumatic pump according to claim 7, wherein the T-shaped plate is mounted on the crisis hanger housing through a pin shaft and can rotate around the pin shaft; the hook head is arranged on the crisis buckle shell through a pin shaft and can rotate by taking the pin shaft as a center.
9. The off-line verification method for the mechanical flyweight of the steam-driven pump according to claim 7, further comprising a coupling shield, wherein the coupling shield is installed on the test bed base through a screw and covers the coupling, and therefore rotating part protection is achieved.
10. The off-line calibration method for the mechanical flyweight of the pneumatic pump according to claim 7, wherein the limit switch, the rotating speed probe and the variable frequency motor are all connected to an operation platform, and operation control is realized through a PLC (programmable logic controller).
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