An off-line calibration method for mechanical flyweight of pneumatic pump

Abstract

The present invention relates to the field of nuclear power equipment, and in particular to an off-line calibration method for a mechanical flyweight of a pneumatic pump. The method comprises respectively performing stability calibration and installation depth calibration on the mechanical flyweight used for the test, wherein the stability calibration comprises: installing the mechanical flyweight used for the test on the test dummy shaft of the off-line calibration device of the mechanical flyweight of the pneumatic pump; testing the rotation speed when the rotation speed reaches 9675 rpm for 2 to 3 times, and comparing and analyzing the accuracy of the mechanical flyweight action; the depth calibration comprises: adjusting the mechanical flyweight tripping value to 9675 rpm and 9850 rpm, respectively, and measuring and recording the installation depth of the mechanical flyweight at this time; the installation depth obtained from the two tests is the upper and lower limits of the calibration depth of the mechanical flyweight. The present invention does not occupy the main line construction period of the unit overhaul, calibrates the movement stability of the mechanical flyweight in advance, and calibrates the installation depth of the flyweight through the calibration device, so as to ensure that the online test is qualified once.

Description

Technical Field

[0001] The invention relates to the field of nuclear power equipment, and in particular to an off-line calibration method for a pneumatic pump mechanical flyweight. Background Art

[0002] The steam-driven auxiliary feedwater pump is a nuclear safety facility specially set up in a nuclear power plant. According to the current nuclear safety regulatory requirements, a mechanical overspeed test needs to be carried out during each cycle overhaul. Currently, this test needs to be carried out during the actual operation of the pump unit, and the pump unit speed needs to reach 9675-9850rpm, so it needs to occupy the unit hot shutdown platform window.

[0003] Due to the limitation of the test window and the unpredictable stability of the mechanical fly hammer before the test, the probability of a failed test is high. The adjustment process of the mechanical fly hammer action value is entirely based on experience and there are large uncertainty factors in the adjustment. Therefore, it has a great impact on the main line of overhaul and affects the economic efficiency of the unit. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an off-line calibration method for a pneumatic pump mechanical flyweight, which does not occupy the main line construction period of the unit overhaul, and can calibrate the movement stability of the mechanical flyweight on an off-line high-speed test bench in advance, and calibrate the installation depth of the flyweight through a calibration device to ensure that the online test is qualified once, so as to avoid affecting the main line construction period of the overhaul.

[0005] The present invention provides an off-line calibration method for a mechanical flyweight of a pneumatic pump, wherein stability calibration and installation depth calibration are respectively performed on the mechanical flyweight used in the test, wherein the stability calibration of the mechanical flyweight used in the test comprises the following steps:

[0006] Step S1: installing a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device for a pneumatic pump mechanical flyweight; turning on cooling water, injecting it into a water chamber and forming a forced circulation;

[0007] Step S2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality;

[0008] Step S3: before the speed reaches the acceptance range, the speed is slowly increased at a rate of 1100-1300 rpm / min; when it reaches 9675 rpm, the speed increase rate is controlled to be 300-350 rpm / min until the mechanical hammer is fired, pushing the T-plate to rotate clockwise and disengage from the hook head, and finally the limit switch is disengaged from the reset rod, triggering the limit opening signal;

[0009] Step S4: Repeat steps 2 to 3 twice;

[0010] Step S5: reading and recording the rotation speed at each tripping from the PLC controller, and comparing and analyzing the accuracy of the mechanical flyweight action;

[0011] The installation depth calibration of the mechanical flyweight for the test includes:

[0012] Step A1: Install the mechanical flyweight for the test on the test dummy shaft of the off-line calibration device of the pneumatic pump mechanical flyweight; start the cooling water, inject it into the water chamber and form a forced circulation;

[0013] Step A2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality;

[0014] Step A3: Before the speed reaches the acceptance range, slowly increase the speed at a rate of 1100-1300 rpm / min; adjust the mechanical fly hammer tripping values ​​to 9675 rpm and 9850 rpm respectively, and measure and record the installation depth of the mechanical fly hammer at this time;

[0015] The installation depths obtained from the two tests are the upper and lower limits of the mechanical flyweight calibration depth.

[0016] 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 speed rises to 10000rpm, the shutdown signal is automatically triggered and the variable frequency motor is powered off.

[0017] Preferably, in step S2,

[0018] Start the variable frequency motor to simulate the actual start-up of the pump group, increase the speed to 8000rpm within 4s, and run stably for 5min.

[0019] Preferably, in step S3, the acceptance interval is 9675-9850 rpm.

[0020] Preferably, in step S3, before the speed reaches the acceptance range, the speed is slowly increased at a rate of 1200 rpm / min; when it reaches 9675 rpm, the speed increase rate is controlled to 300 rpm / min until the hammer is fired, pushing the T-plate to rotate clockwise and disengage from the hook head, and finally the limit switch is disengaged from the reset rod, triggering the limit open signal.

[0021] Preferably, in step S5, if the rotation speed deviation during the three trips does not exceed 1% of the mean value and does not show a monotonically increasing or decreasing trend, the mechanical flyweight is qualified.

[0022] Preferably, the off-line calibration device of the pneumatic pump mechanical flyweight is composed of an emergency buckle assembly, a water chamber, a variable frequency motor, and a test bench base;

[0023] The water chamber and the variable frequency motor are fixedly connected to the base of the test bench in sequence;

[0024] The emergency hook assembly includes: a T-plate rotatably arranged on one side of the emergency hook housing, a manual stop lever horizontally arranged, and the T-plate connected to one end of the manual stop lever through a spring; a hook head is located below the manual stop lever, and one end of the hook head is clamped with the bottom end of the T-plate, and the other end is rotatably arranged on the emergency hook housing; one end of the reset rod is connected to the hook head, and when the reset rod is lifted, the hook head will be hooked with the T-plate; the manual stop lever is sleeved on the emergency hook housing A preload spring is installed in the guide hole of the cover plate, which always maintains the thrust to the right to achieve reset; when the manual stop lever is manually pushed, the T-plate and the hook head can be separated to achieve manual release; the cover plate of the emergency hook housing is connected to the emergency hook housing by bolts, and a sealing gasket is arranged between the two; the limit switch is fixed on the limit switch bracket, and the limit switch bracket is fixed on the side of the test bench base; when the T-plate and the hook head are in the hook match, the limit switch contacts the reset rod and outputs a signal;

[0025] One side wall of the water chamber has an opening, the T-plate and the hook head part extend into the water chamber, and the two ends of the emergency hook shell are connected to the side wall of the water chamber;

[0026] A top cover is provided on the top of the water chamber, and the top cover is connected to the water chamber by bolts;

[0027] The speed probe is installed on the threaded hole of the water chamber. The speed probe and the water chamber are sealed by an O-ring. After being installed in place, the center of the speed probe is flush with the center of the test dummy shaft and faces the magnetic part of the test dummy shaft to achieve magnetic induction.

[0028] The non-drive end bearing chamber and the drive end bearing chamber are horizontally and symmetrically installed on the side wall of the water chamber, the inner holes of the non-drive end bearing chamber and the drive end bearing chamber are concentric, the test dummy shaft passes through the non-drive end bearing chamber and the drive end bearing chamber, and the drive end of the test dummy shaft is on the drive end bearing chamber side;

[0029] The shaft extension end of the test dummy shaft and the shaft extension end of the variable frequency motor are connected and driven via a coupling;

[0030] The center lines of the test dummy shaft, the non-drive end bearing chamber, the drive end bearing chamber, the coupling and the frequency conversion motor are in the same direction and aligned.

[0031] Preferably, the T-plate is mounted on the emergency hook housing through a pin shaft and can rotate around the pin shaft; the hook head is mounted on the emergency hook housing through a pin shaft and can rotate around the pin shaft.

[0032] Preferably, it also includes a coupling shield, which is mounted on the test bench base by screws and covers the coupling to protect the rotating parts.

[0033] Preferably, the limit switch, speed probe and variable frequency motor are all connected to the operating platform, and the operation control is achieved through a PLC controller.

[0034] Compared with the prior art, the off-line calibration method of the pneumatic pump mechanical flyweight of the present invention calibrates the action stability of the mechanical flyweight on an off-line high-speed test bench, which can not only accurately adjust the rotation speed and realize real-time monitoring of the flyweight action value, but also calibrate the installation depth of the flyweight on the dummy shaft, providing a technical reference for on-site installation. The stability of the mechanical flyweight after calibration can be guaranteed, and the actual installation depth of the mechanical flyweight on site can be predetermined by the calibration device, ensuring that the subsequent pump group overspeed test is qualified once. Moreover, the calibration process of the present invention does not occupy the main line construction period of the unit overhaul, thus avoiding the impact on the main line construction period of the overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram showing the structure of an emergency hook assembly;

[0036] Figure 2 It shows the schematic diagram of the assembly of the water chamber and the emergency hook assembly;

[0037] Figure 3 A schematic diagram showing the structure of the calibration device;

[0038] In the figure,

[0039] 1 is the installation position of the test fly hammer, 2 is the T-plate, 3 is the emergency buckle housing, 4 is the spring, 5 is the manual shutdown lever, 6 is the limit switch, 7 is the test dummy shaft, 8 is the buckle hook, 9 is the emergency buckle housing cover, 10 is the reset rod, 11 is the limit switch bracket, 12 is the test bench base, 13 is the water chamber, 14 is the water chamber cover, 15 is the speed probe, 16 is the non-drive end bearing chamber, 17 is the drive end bearing chamber, 18 is the coupling, 19 is the coupling guard, and 20 is the variable frequency motor. DETAILED DESCRIPTION

[0040] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0041] The embodiment of the present invention discloses an off-line calibration method for a mechanical flyweight of a pneumatic pump, wherein stability calibration and installation depth calibration are respectively performed on the mechanical flyweight used in the test, wherein the stability calibration of the mechanical flyweight used in the test comprises the following steps:

[0042] Step S1: installing a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device for a pneumatic pump mechanical flyweight; turning on cooling water, injecting it into a water chamber and forming a forced circulation;

[0043] Step S2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality;

[0044] Step S3: before the speed reaches the acceptance range, the speed is slowly increased at a rate of 1100-1300 rpm / min; when it reaches 9675 rpm, the speed increase rate is controlled to be 300-350 rpm / min until the hammer is fired, pushing the T-plate to rotate clockwise and disengage from the hook head, and finally the limit switch is disengaged from the reset rod, triggering the limit opening signal;

[0045] Step S4: Repeat steps 2 to 3 twice;

[0046] Step S5: reading and recording the rotation speed at each tripping from the PLC controller, and comparing and analyzing the accuracy of the mechanical flyweight action;

[0047] The installation depth calibration of the mechanical flyweight for the test includes:

[0048] Step A1: Install the mechanical flyweight for the test on the test dummy shaft of the off-line calibration device of the pneumatic pump mechanical flyweight; start the cooling water, inject it into the water chamber and form a forced circulation;

[0049] Step A2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality;

[0050] Step A3: Before the speed reaches the acceptance range, slowly increase the speed at a rate of 1100-1300 rpm / min; adjust the mechanical fly hammer tripping values ​​to 9675 rpm and 9850 rpm respectively, and measure and record the installation depth of the mechanical fly hammer at this time;

[0051] The installation depths obtained from the two tests are the upper and lower limits of the mechanical flyweight calibration depth.

[0052] The method of the present invention realizes the offline calibration of the mechanical fly hammer in conjunction with the offline calibration device. The offline calibration device simulates the on-site water environment, and the mechanical fly hammer is installed on a dummy shaft, and the size of the dummy shaft must be consistent with the design size of the pump shaft. The input end of the dummy shaft is connected to an external variable frequency motor, and the variable frequency motor can achieve stepless speed regulation of 0-10000rpm. The calibration device is designed with a speed measuring device and a fly hammer action monitoring device, which can realize the recording function of the fly hammer action speed.

[0053] When the mechanical flyweights used in the test are checked for stability:

[0054] Step S1: installing a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device for a mechanical flyweight of a pneumatic pump; the mechanical flyweight is installed perpendicular to the axis of the test dummy shaft, and the movement direction of the test flyweight is perpendicular to the axis of the test dummy shaft; and the installation method of the test flyweight on the pump shaft of the pneumatic pump is consistent;

[0055] Turn on the cooling water, inject it into the water chamber and form a forced circulation;

[0056] After the cooling water is injected, the overspeed protection shutdown value is set through the PLC controller, that is, when the speed rises to 10000rpm, the shutdown signal is automatically triggered and the variable frequency motor is powered off.

[0057] Step S2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality;

[0058] Specifically, start the variable frequency motor to simulate the actual startup of the pump group, increase the speed to 8000rpm within 4s, run stably for 5min, observe the operating status of the calibration device, and further increase the speed after confirming that there is no abnormality.

[0059] Step S3: before the speed reaches the acceptance interval, the acceptance interval is 9675-9850rpm, the speed is slowly increased at a rate of 1100-1300rpm / min; when it reaches 9675rpm, the speed increase rate is controlled to be 300-350rpm / min until the hammer is fired, pushing the T-plate to rotate clockwise and disengage from the hook head, and finally the limit switch is disengaged from the reset rod, triggering the limit opening signal;

[0060] Specifically, before the speed reaches the acceptance range, the speed is slowly increased at a rate of 1200rpm / min; when it reaches 9675rpm, the speed increase rate is controlled at 300rpm / min until the hammer is fired, pushing the T-plate to rotate clockwise and disengage from the hook head, and finally the limit switch disengages from the reset rod, triggering the limit open signal.

[0061] Step S4: Repeat steps 2 to 3 twice;

[0062] Step S5: reading and recording the rotation speed at each tripping from the PLC controller, and comparing and analyzing the accuracy of the mechanical flyweight action;

[0063] The speed deviation during three trips does not exceed 1% of the mean, and there is no monotonically increasing or decreasing trend. The mechanical fly hammer is qualified.

[0064] When calibrating the installation depth of the mechanical flyweight used in the test:

[0065] Step A1: Install a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device for a mechanical flyweight of a pneumatic pump; the mechanical flyweight is installed perpendicular to the axis of the test dummy shaft, and the movement direction of the test flyweight is perpendicular to the axis of the test dummy shaft; the installation method of the mechanical flyweight on the pump shaft of the pneumatic pump is consistent;

[0066] Turn on the cooling water, inject it into the water chamber and form a forced circulation;

[0067] After the cooling water is injected, the overspeed protection shutdown value is set through the PLC controller, that is, when the speed rises to 10000rpm, the shutdown signal is automatically triggered and the variable frequency motor is powered off.

[0068] Step A2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality;

[0069] Specifically, start the variable frequency motor to simulate the actual startup of the pump group, increase the speed to 8000rpm within 4s, run stably for 5min, observe the operating status of the calibration device, and further increase the speed after confirming that there is no abnormality.

[0070] Step A3: before the speed reaches the acceptance range, the speed is slowly increased at a rate of 1100-1300 rpm / min, preferably 1200 rpm / min; the mechanical fly hammer tripping values ​​are adjusted to 9675 rpm and 9850 rpm respectively, and the installation depth of the mechanical fly hammer at this time is measured and recorded respectively;

[0071] The installation depths obtained from the two tests are the upper and lower limits of the mechanical flyweight calibration depth.

[0072] In the present invention, if Figures 1 to 3 As shown, the off-line calibration device of the pneumatic pump mechanical flyweight is composed of an emergency buckle assembly, a water chamber 13, a variable frequency motor 20, and a test bench base 12;

[0073] The test bench base 12 is fixedly connected to the water chamber 13 and the variable frequency motor 20 in sequence;

[0074] The emergency buckle assembly comprises: a T-shaped plate 2 rotatably arranged on one side of the emergency buckle housing 3, preferably, the T-shaped plate 2 is installed on the emergency buckle housing 3 through a pin shaft and can rotate around the pin shaft;

[0075] The manual stop lever 5 is arranged horizontally, and the T-plate 2 is connected to one end of the manual stop lever 5 through the spring 4; the hook head 8 is located below the manual stop lever 5, and one end of the hook head 8 is engaged with the bottom end of the T-plate 2, and the other end is rotatably arranged on the emergency hook housing 3; preferably, the hook head 8 is installed on the emergency hook housing 3 through a pin shaft, and can rotate around the pin shaft;

[0076] The spring 4 is installed in the emergency hook housing 3 to provide a pre-tightening force for the T-plate 2 and a counterclockwise thrust to the T-plate 2 to facilitate the reset of the hook;

[0077] One end of the reset rod 10 is connected to the hook head 8. Preferably, the hook head 8 and the reset rod 10 are connected by a positioning pin. When the reset rod 10 is lifted, the hook head 8 will be hooked and matched with the T-shaped plate 2.

[0078] The manual stop lever 5 is sleeved in the guide hole of the emergency hook housing cover plate 9 and is installed with a preload spring to always maintain a thrust to the right to achieve reset; when the manual stop lever 5 is manually pushed, the T-plate 2 can be separated from the hook head 8 to achieve manual release;

[0079] The emergency buckle housing cover plate 9 is connected to the emergency buckle housing 3 by bolts, and a sealing gasket is arranged between the two;

[0080] The limit switch 6 is fixed on the limit switch bracket 7, and the limit switch bracket 7 is fixed on the side of the test bench base 12; when the T-plate 2 and the hook head 8 are in hooking engagement, the limit switch 6 contacts the reset rod 10 and outputs a signal;

[0081] One side wall of the water chamber 13 has an opening, the T-plate 2 and the hook head 8 partially extend into the water chamber 13, and the two ends of the emergency hook housing 3 are connected to the side wall of the water chamber 13;

[0082] A top cover 14 is provided on the top of the water chamber 13, and the top cover 14 is connected to the water chamber 13 by bolts. Preferably, a sealing gasket is provided between the two. After removing the top cover 14, the internal components of the water chamber 13 can be observed from directly above, so as to adjust the mechanical flyweight 1.

[0083] The speed probe 15 is installed on the threaded hole of the water chamber 13. The speed probe 15 and the water chamber 13 are sealed by an O-ring. After being installed in place, the center of the speed probe 15 is flush with the center of the test dummy shaft 7 and faces the magnetic part of the test dummy shaft 7 to achieve magnetic induction.

[0084] The non-drive end bearing chamber 16 and the drive end bearing chamber 17 are horizontally and symmetrically installed on the side wall of the water chamber 13, and are preferably connected to the water chamber 13 by bolts, with a sealing gasket installed in the middle;

[0085] The inner holes of the non-drive end bearing chamber 16 and the drive end bearing chamber 17 are concentric, the test dummy shaft 7 passes through the non-drive end bearing chamber 16 and the drive end bearing chamber 17, and the drive end of the test dummy shaft 7 is on the drive end bearing chamber 17 side;

[0086] 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 via a coupling 18;

[0087] The center lines of the shafts and holes 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 in the same direction and aligned.

[0088] Preferably, a coupling shield 19 is further included. The coupling shield 19 is mounted on the test bench base 12 by screws and covers the coupling 18 to protect the rotating parts.

[0089] The limit switch 6, the speed probe 15 and the variable frequency motor 20 are all connected to the operating platform, and the operation control is realized through the PLC controller.

[0090] When conducting the test, the mechanical flyweight 1 is embedded in the test dummy shaft 7, the mechanical flyweight 1 is installed perpendicular to the axis of the test dummy shaft 7, and the movement direction of the mechanical flyweight 1 is perpendicular to the axis of the test dummy shaft 7, which is consistent with its installation method on the pump shaft of the pneumatic pump.

[0091] After the mechanical fly hammer is verified to be qualified in stability by the verification device, it is installed on the pump shaft according to this standard, so that the pneumatic pump mechanical overspeed test can be passed in one time, saving the adjustment time of the fly hammer on the pump shaft and shortening the test period.

[0092] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0093] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An off-line calibration method for a pneumatic pump mechanical flyweight, characterized in that: The mechanical flyweights used in the test are respectively subjected to stability verification and installation depth calibration, wherein the stability verification of the mechanical flyweights used in the test includes the following steps: Step S1: installing a mechanical flyweight for testing on a test dummy shaft of an off-line calibration device for a pneumatic pump mechanical flyweight; turning on cooling water, injecting it into a water chamber and forming a forced circulation; Step S2: Start the variable frequency motor to simulate the actual start-up of the pump group, increase the speed to 8000rpm within 4s, run stably for 5min, observe the operating status of the calibration device, and further increase the speed after confirming that there is no abnormality; Step S3: Before the speed reaches the acceptance range of 9675-9850rpm, slowly increase the speed at a rate of 1200rpm / min; when it reaches 9675rpm, control the speed increase rate of 300rpm / min until the mechanical hammer is fired, pushing the T-plate to rotate clockwise and disengage from the hook head, and finally the limit switch is disengaged from the reset rod, triggering the limit open signal; Step S4: Repeat steps 2-3 twice; Step S5: reading and recording the rotation speed at each tripping from the PLC controller, and comparing and analyzing the accuracy of the mechanical flyweight action; The speed deviation during the three trips does not exceed 1% of the mean value, and there is no monotonically increasing or decreasing trend. The mechanical flyweight is qualified; The installation depth calibration of the mechanical flyweight for the test includes: Step A1: Install the mechanical flyweight for the test on the test dummy shaft of the off-line calibration device of the pneumatic pump mechanical flyweight; start the cooling water, inject it into the water chamber and form a forced circulation; Step A2: Start the variable frequency motor, simulate the actual start-up of the pump group, run it stably, observe the operation of the calibration device, and further increase the speed after confirming that there is no abnormality; Step A3: Before the speed reaches the acceptance range, slowly increase the speed at a rate of 1100-1300 rpm / min; adjust the mechanical fly hammer tripping values ​​to 9675 rpm and 9850 rpm respectively, and measure and record the installation depth of the mechanical fly hammer at this time; The installation depths obtained from the two tests are the upper and lower limits of the mechanical flyweight calibration depth.

2. The off-line calibration method of a pneumatic pump mechanical flyweight according to claim 1 is characterized in that: In the step S1, after the cooling water is injected, the overspeed protection shutdown value is set by the PLC controller, that is, when the speed rises to 10000rpm, the shutdown signal is automatically triggered and the variable frequency motor is powered off.

3. The off-line calibration method of a pneumatic pump mechanical flyweight according to claim 1, characterized in that: The off-line calibration device of the pneumatic pump mechanical flyweight is composed of an emergency buckle assembly, a water chamber, a variable frequency motor, and a test bench base; The water chamber and the variable frequency motor are fixedly connected to the base of the test bench in sequence; The emergency hook assembly includes: a T-plate rotatably arranged on one side of the emergency hook housing, a manual stop lever horizontally arranged, and the T-plate connected to one end of the manual stop lever through a spring; a hook head is located below the manual stop lever, and one end of the hook head is clamped with the bottom end of the T-plate, and the other end is rotatably arranged on the emergency hook housing; one end of the reset rod is connected to the hook head, and when the reset rod is lifted, the hook head will be hooked with the T-plate; the manual stop lever is sleeved on the emergency hook housing A preload spring is installed in the guide hole of the cover plate, which always maintains the thrust to the right to achieve reset; when the manual stop lever is manually pushed, the T-plate and the hook head can be separated to achieve manual release; the cover plate of the emergency hook housing is connected to the emergency hook housing by bolts, and a sealing gasket is arranged between the two; the limit switch is fixed on the limit switch bracket, and the limit switch bracket is fixed on the side of the test bench base; when the T-plate and the hook head are in the hook match, the limit switch contacts the reset rod and outputs a signal; One side wall of the water chamber has an opening, the T-plate and the hook head part extend into the water chamber, and the two ends of the emergency hook shell are connected to the side wall of the water chamber; A top cover is provided on the top of the water chamber, and the top cover is connected to the water chamber by bolts; The speed probe is installed on the threaded hole of the water chamber. The speed probe and the water chamber are sealed by an O-ring. After being installed in place, the center of the speed probe is flush with the center of the test dummy shaft and faces the magnetic part of the test dummy shaft to achieve magnetic induction. The non-drive end bearing chamber and the drive end bearing chamber are horizontally and symmetrically installed on the side wall of the water chamber, the inner holes of the non-drive end bearing chamber and the drive end bearing chamber are concentric, the test dummy shaft passes through the non-drive end bearing chamber and the drive end bearing chamber, and the drive end of the test dummy shaft is on the drive end bearing chamber side; The shaft extension end of the test dummy shaft and the shaft extension end of the variable frequency motor are connected and driven via a coupling; The center lines of the test dummy shaft, the non-drive end bearing chamber, the drive end bearing chamber, the coupling and the frequency conversion motor are in the same direction and aligned.

4. The off-line calibration method of a pneumatic pump mechanical flyweight according to claim 3 is characterized in that: The T-plate is installed on the emergency hook shell through a pin shaft and can rotate around the pin shaft; the hook head is installed on the emergency hook shell through a pin shaft and can rotate around the pin shaft.

5. The off-line calibration method of a pneumatic pump mechanical flyweight according to claim 3 is characterized in that: It also includes a coupling shield, which is installed on the test bench base through screws and covers the coupling to protect the rotating parts.

6. The off-line calibration method of a pneumatic pump mechanical flyweight according to claim 3, characterized in that: The limit switch, speed probe and frequency conversion motor are all connected to the operating platform, and the operation control is realized through the PLC controller.

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