CN216248032U - Device for detecting precision of low-medium frequency impulse response spectrum measuring equipment - Google Patents
Device for detecting precision of low-medium frequency impulse response spectrum measuring equipment Download PDFInfo
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- CN216248032U CN216248032U CN202122694070.XU CN202122694070U CN216248032U CN 216248032 U CN216248032 U CN 216248032U CN 202122694070 U CN202122694070 U CN 202122694070U CN 216248032 U CN216248032 U CN 216248032U
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Abstract
The utility model relates to a device for detecting the precision of middle and low frequency impulse response spectrum measuring equipment, wherein a guide rail is fixedly arranged on the inner surface of a base of the device, a sliding table is connected onto the guide rail in a sliding manner, and a movable cam and a rack are sequentially and fixedly arranged on the sliding table; a guide seat is fixedly arranged on the surface of the upper end of the base, a vertical push rod is connected to a bearing in a central hole of the guide seat, a platform is fixedly connected to the upper end of the vertical push rod, medium and low frequency response spectrum measuring equipment is placed on the platform, the lower end of the vertical push rod is connected with the middle part of a swinging push rod through a pin shaft, one end of the swinging push rod is connected with the lower surface of the guide seat through a pin shaft, and the other end of the swinging push rod is connected with the upper surface of the movable cam in a sliding mode; the rack is engaged with a gear which is fixed on the shaft, two ends of the shaft are connected with the side wall bearing of the base, one end part of the shaft is connected with a motor, and the motor is fixedly installed on the base. The test data measured by the utility model is accurate, complete and reliable.
Description
Technical Field
The utility model relates to a precision detection device, in particular to a device for detecting the precision of middle and low frequency impulse response spectrum measuring equipment.
Background
An impact response spectrum is generally adopted internationally to characterize the magnitude of impact load (i.e., impact environment) suffered by equipment. At present, an acceleration sensor is usually adopted to measure acceleration response data of an impact to generate an impact response spectrum, but the acceleration sensor can generate a null drift phenomenon under the action of a strong impact load. The null drift phenomenon affects the accuracy and integrity of the low-frequency band values in the impact spectrum. Therefore, in order to accurately analyze the impact environment suffered by the equipment, domestic enterprises develop middle and low frequency impact response spectrum measuring equipment.
The low-medium frequency impact spectrum measuring equipment belongs to non-standard equipment, and the design principle, the structural scheme, the test measuring method and the like of the low-medium frequency impact spectrum measuring equipment developed by different enterprise units have a plurality of differences. In addition, according to the relevant standards, the curve of the ideal acceleration impact load is a sine curve, while the acceleration impact load curve of the strong impact testing machine is only similar to the sine curve, if the precision of the medium-low frequency impact spectrum measuring equipment is detected by using the strong impact testing machine, the data collected by the medium-low frequency impact spectrum measuring equipment is compared with the theoretical value, and a larger error exists. Therefore, in order to ensure that the measurement value of the medium-low frequency impulse response spectrum measurement equipment under the action of a strong impact load is accurate and reliable, a device for detecting the precision of the medium-low frequency impulse response spectrum measurement equipment is urgently needed to be developed.
Disclosure of Invention
Utility model purpose: the utility model provides a device for detecting the precision of middle and low frequency response spectrum measuring equipment, and aims to detect the precision of a measured value of the middle and low frequency impact spectrum measuring equipment under the action of a strong impact load so as to ensure that test data measured by the middle and low frequency impact spectrum measuring equipment is accurate, complete and reliable in actual working conditions.
The technical scheme is as follows:
a device for detecting the precision of middle and low frequency response spectrum measuring equipment is characterized in that a guide rail is fixedly arranged on the inner surface of a base of the device, a sliding table is connected onto the guide rail in a sliding manner, and a movable cam and a rack are sequentially and fixedly arranged on the sliding table; a guide seat is fixedly arranged on the surface of the upper end of the base, a vertical push rod is connected to a bearing in a central hole of the guide seat, a platform is fixedly connected to the upper end of the vertical push rod, medium and low frequency response spectrum measuring equipment is placed on the platform, the lower end of the vertical push rod is connected with the middle part of a swinging push rod through a pin shaft, one end of the swinging push rod is connected with the lower surface of the guide seat through a pin shaft, and the other end of the swinging push rod is connected with the upper surface of the movable cam in a sliding mode; the rack is engaged with a gear which is fixed on the shaft, two ends of the shaft are connected with the side wall bearing of the base, one end part of the shaft is connected with a motor, and the motor is fixedly installed on the base.
Further, the swing push rod includes: the middle part of the swing push rod body is provided with a strip hole, the strip hole is internally and slidably connected with a vertical push rod pin shaft, and the vertical push rod pin shaft is connected with a vertical push rod; one end of the swing push rod body is provided with a roller through a roller pin shaft, and the roller is connected with the upper surface of the movable cam in a sliding manner; and a swinging pin shaft is arranged at the other end of the swinging push rod body and is connected with the lower surface of the guide seat.
Furthermore, the upper surface of the moving cam is sequentially provided with an initial straight-line segment, a pushing segment and a stopping straight-line segment, the initial straight-line segment and the stopping straight-line segment are both straight-line segments, and the pushing segment is obtained according to a motion equation of an ideal acceleration impact load curve of a sine curve.
Furthermore, an anti-rotation flat key is arranged between the platform and the vertical push rod.
Further, the base is of a trapezoidal groove body structure with a rectangular groove body arranged inside, and a plurality of grooves are formed in the outer walls of the two sides of the base; the opening part at base both ends is fixed with the end cover board, and base upper end opening part is fixed in proper order and is provided with first apron, guide holder and second apron to form enclosed construction.
Furthermore, a limiting block is arranged on the end cover plate.
Has the advantages that:
1. the waveform applied by the medium-low frequency shock response spectrum measuring equipment conforms to the waveform required by the relevant standard.
2. In the pushing process, the device has no rigid impact or flexible impact, and has no additional impact on the device.
3. The utility model can realize different impact loads by changing the push stroke profile curve of the moving cam.
Drawings
FIG. 1 is a first schematic structural diagram of the present invention;
FIG. 2 is a second schematic structural view of the present invention;
FIG. 3 is a third schematic structural view of the present invention;
FIG. 4 is a schematic structural diagram of a medium-low frequency response spectrum measuring device;
FIG. 5 is a schematic view of the structure of the swing rod;
FIG. 6 is a schematic view of a moving cam profile;
FIG. 7 is a motion diagram of a sinusoidal acceleration motion law;
FIG. 8 is a first schematic diagram illustrating the operation of the present invention;
FIG. 9 is a second schematic diagram of the operation of the present invention;
FIG. 10 is a third schematic view of the working process of the present invention;
FIG. 11 is a fourth schematic diagram illustrating the operation of the present invention;
reference numerals:
1. the device comprises a base, 1-1 parts of a groove, 2 parts of a first cover plate, 3 parts of a platform, 4 parts of a guide seat, 5 parts of a second cover plate, 6 parts of an end cover plate, 7 parts of a motor, 8 parts of a vertical push rod, 9 parts of a nut, 10 parts of an anti-rotation flat key, 11 parts of a linear bearing, 12 parts of a swing push rod, 12-1 parts of a swing push rod body, 12-2 parts of a roller, 12-3 parts of a roller pin shaft, 12-4 parts of a vertical push rod pin shaft, 12-5 parts of a swing pin shaft, 13 parts of a limiting block, 14 parts of a guide rail, 15 parts of a sliding block, 16 parts of a sliding table, 17 parts of a moving cam, 17-1 parts of an initial straight line section, 17-2 parts of a push range section, 17-3 parts of a stop straight line section, 18 parts of a rack, 19 parts of a gear, 20 parts of a fixed seat, 21 parts of a bearing and a seat, 22 parts of an end cover, 23 parts of a shaft, 24 parts of a driving flat key, 25 parts of a round nut, 26 parts of a transition fixed seat, 27 parts of a coupler, 28. 28-1 part of medium-low frequency response spectrum measuring equipment, 28-2 parts of a base, 28-2 parts of a shell, 28-3 parts of a magnetic ring of a magnetic hysteresis sensor, 28-4 parts of a magnetic hysteresis sensor rod, 28-5 parts of a top cover, 28-6 parts of a spring, 28-7 parts of a mass block and 28-8 parts of a guide rod.
Detailed Description
The utility model is described in more detail below with reference to the accompanying drawings.
The utility model relates to a device for detecting a medium-low frequency impulse response spectrum measuring device, and fig. 4 is a structure of the medium-low frequency impulse response spectrum measuring device, and the medium-low frequency impulse response spectrum measuring device 28 is taken as an example for explanation in the utility model. The medium and low frequency response spectrum measuring apparatus 28 includes: the magnetic hysteresis sensor comprises a base 28-1, a shell 28-2, a magnetic hysteresis sensor ring 28-3, a hysteresis sensor rod 28-4, a top cover 28-5, a spring 28-6, a mass block 28-7 and a guide rod 28-8, wherein the upper end and the lower end of the shell 28-2 are respectively arranged on the top cover 28-5 and the base 28-1; a magnetic hysteresis sensor rod 28-4 and a guide rod 28-8 are arranged between the top cover 28-5 and the base 28-1 along the axis of the shell 28-2, and a mass 28-7 is connected to the guide rod 28-8 in a clearance mode, namely the mass 28-7 can freely slide on the guide rod 28-8; one end of the mass block 28-7 is fixed with one end of a spring 28-6, the other end of the spring 28-6 is fixed on the top cover 28-5, and the spring 28-6 is sleeved on the guide rod 28-8; the mass 28-7 is provided with a magnetic hysteresis sensor ring 28-3, and the magnetic hysteresis sensor ring 28-3 is fitted over the magnetic hysteresis sensor rod 28-4 such that the magnetic hysteresis sensor ring 28-3 can slide with the mass 28-7 over the magnetic hysteresis sensor rod 28-4.
In this embodiment, when the medium-low frequency impulse response spectrum measuring device shown in fig. 4 is used to measure the response of medium-low frequency impulse, the base of the measuring device is fixed at the measuring position through bolts, when the measuring device is impacted by the guide rod, the mass block 28-7 generates reciprocating vibration under the action of the spring 28-6, and simultaneously, the magnetic ring 28-3 of the hysteresis sensor moves on the rod 28-4 of the hysteresis sensor along with the mass block 28-7. And a data line of the hysteresis sensor is connected with external data acquisition equipment, and impact response data under medium and low frequency impact load can be obtained through the data acquisition equipment.
The structure of the middle and low frequency impulse response spectrum measuring device adopted by different users may be different from that shown in fig. 4, but the principle is the same. The structure of the medium and low frequency impulse response spectrum measuring equipment is not limited in the utility model.
In addition, according to the relevant standard, the curve of the ideal acceleration impact load measured by the medium-low frequency spectrum measuring device is a sine curve.
According to the medium and low frequency impulse response spectrum measuring device and the impulse load curve specified by the relevant standard, the device for detecting the medium and low frequency impulse response spectrum measuring device is further explained with reference to the attached drawings.
As shown in fig. 1, 2 and 3, an apparatus for detecting a medium and low frequency impulse response spectrum measuring device includes: the base 1, first apron 2, platform 3, guide holder 4, second apron 5, end cover 6, motor 7, vertical push rod 8, nut 9, prevent changeing flat key 10, linear bearing 11, swing push rod 12, stopper 13, guide rail 14, slider 15, slip table 16, remove cam 17, rack 18, gear 19, fixing base 20, bearing and bearing frame 21, end cover 22, axle 23, drive flat key 24, round nut 25, transition fixing base 26, shaft coupling 27.
As shown in fig. 1-3, the base 1 may be secured to a foundation or other fixed countertop. A guide rail 14 is fixedly arranged on the inner surface of a base 1 of the device, and a sliding table 16 is connected to the guide rail 14 in a sliding manner through a sliding block 15, so that the sliding table 16 can slide on the guide rail 14. A moving cam 17 and a rack 18 are sequentially and fixedly arranged on the sliding table 16; the fixed surface of base 1 upper end is provided with guide holder 4, and the centre bore of guide holder 4 is connected with vertical push rod 8 through linear bearing 11 bearing, and vertical push rod 8 is installed in linear bearing 11's downthehole, makes vertical push rod 8 slide from top to bottom. The upper end of a vertical push rod 8 is fixedly connected with a platform 3 through a nut 9, medium and low frequency response spectrum measuring equipment 28 is placed on the platform 3, the lower end of the vertical push rod 8 is in pin joint with the middle of a swinging push rod 12, one end of the swinging push rod 12 is in pin joint with the lower surface of a guide seat 4 through a fixed seat 20, the fixed seat 20 is fixedly connected with the guide seat 4, and the other end of the swinging push rod 12 is in sliding connection with the upper surface of a movable cam 17; the rack 18 is engaged with a gear 19, the gear 19 is fixed on a shaft 23 by driving a flat key 24, and the gear 19 is fixed on the shaft 23 by a round nut 25. The two ends of the shaft 23 are fixed on the base 1, the end cover 22 is installed at one end of one of two holes for installing the bearing and the bearing seat 21 on the base 1, the transition fixing seat 26 is installed at one end of the other hole for installing the bearing and the bearing seat 21 on the base 1, and the motor 7 is installed on the transition fixing seat 26. The motor 7 is connected with the shaft 23 through a coupling 27. The gear 19 is mounted on a shaft 23 and is connected to the shaft 23 by a driving flat key 24, and a round nut 25 fixes the gear 19 to the shaft 23. The gear 19 meshes with a rack 18 mounted on the slide table 16.
As shown in fig. 5, the swing push rod 12 includes: the device comprises a swing push rod body 12-1, a roller 12-2, a roller pin shaft 12-3, a vertical push rod pin shaft 12-4 and a swing pin shaft 12-5, wherein the middle part of the swing push rod body 12-1 is provided with a long hole, the vertical push rod pin shaft 12-4 is connected in the long hole in a sliding manner, and the vertical push rod pin shaft 12-4 is connected with a vertical push rod 8; one end of the swing push rod body 12-1 is provided with a roller 12-2 through a roller pin shaft 12-3, the roller 12-2 is connected with the upper surface of the moving cam 17 in a sliding way, and the roller 12-2 is always on the contour curved surface of the moving cam 17. The other end of the swing push rod body 12-1 is provided with a swing pin shaft 12-5, and the swing pin shaft 12-5 is connected with the lower surface of the guide seat 4 through a fixed seat 20, so that the swing push rod 12 can swing around the fixed seat 20.
As shown in fig. 6, the upper surface of the moving cam 17 is sequentially set as an initial straight-line segment 17-1, a push-stroke segment 17-2 and a stop straight-line segment 17-3, that is, the profile of the contact area between the moving cam 17 and the roller 12-2 of the swing push rod 12 has three parts, the initial straight-line segment 17-1 and the stop straight-line segment 17-3 are both straight-line segments, and the push-stroke segment 17-2 is obtained according to the motion equation of the ideal acceleration impact load curve of a sine curve.
The equation of motion of the sinusoidal acceleration law of motion of the moving cam is as follows, and the diagram of the motion line is shown in fig. 7.
In the formula (I), the compound is shown in the specification,sin order to be able to displace the push rod,ain order to be the acceleration of the push rod,hin order to be the stroke of the push rod,δ 0is the push stroke movement angle of the cam,vis the speed at which the cam is moved.
Thus, displacement ofsThe shape of the curve is the profile of the push stroke section 17-2, and the profile curves of different push stroke sections 17-2 can be obtained by adjusting the relevant parameters such as the motion angle, the stroke and the like of the cam, so as to obtain different acceleration impact loads.
An anti-rotation flat key 10 is arranged between the platform 3 and the vertical push rod 8 to prevent the platform 3 from rotating.
The base 1 is of a trapezoidal groove body structure with a rectangular groove body arranged inside, and a plurality of grooves 1-1 are formed in the outer walls of the two sides of the base 1; the opening part at the two ends of the base 1 is fixed with an end cover plate 6 through bolts, and the opening part at the upper end of the base 1 is sequentially and fixedly provided with a first cover plate 2, a guide seat 4 and a second cover plate 5, thereby forming a closed structure. The ladder-shaped structure and the slot hole reduce the whole weight of the device, and in addition, the ladder-shaped structure is narrow at the top and wide at the bottom, so that the stability of the device is improved.
The end cover plate 6 is provided with a limiting block 13.
The working process of the utility model is further illustrated by means of fig. 8, 9, 10, 11.
As shown in fig. 8, the middle and low frequency impulse response spectrum measuring device 28 is fixed on the platform 3, and the swing push rod 12 and the moving cam 17The initial straight line segment 17-1 is in contact and is located at the leftmost position, which is the initial position of the rocking push rod 12 and the moving cam 17. When the detection is started, the motor 7 is turned on, the driving gear 19 rotates in the direction shown in the figure, and the rack 18 meshed with the gear 19 drives the sliding table 16 and the moving cam 17 in the direction shown in the figure at a speedv 0And (4) moving. At this time, since the motor 7 is in the initial stage of the start-up and does not reach the stable operation, the speed of the moving cam 17 is changedv 0Does not reach the required speedv. At this stage, the roller 12-2 of the swing push rod 12 rolls on a plane, the swing push rod 12 does not swing, the platform 3 does not move, and the medium-low frequency impact response spectrum measuring equipment 28 is not impacted.
As shown in FIG. 9, when the roller 12-2 of the rocking push-rod 12 moves to the end of the initial straight line segment 17-1, the speed of the moving cam 17 reaches the set speedvAnd continues at speedvWhen the roller 12-2 starts to move in the pushing section 17-2 at a constant speed, the swing push rod 12 starts to swing upwards, the platform 3 also starts to move upwards through the vertical push rod 8, and the middle-low frequency impact response spectrum measuring equipment 28 starts to be impacted. By changing different moving cams 17, i.e. different push profiles, different impact loads can be obtained.
As shown in FIG. 10, when the roller 12-2 of the rocking push rod 12 moves to the end of the push section 17-2, i.e., the highest point of the moving cam, the motor 7 stops rotating and brakes, and the moving cam 17 gradually decreases in speedv 1And continuing to move, if the roller 12-2 moves to the tail end of the stopping straight line section 17-3, the moving cam 17 is not stopped, and the sliding table 16 is limited by the limiting block 13. At this stage, the roller 12-2 of the swing push rod 12 rolls on a plane, the swing push rod 12 does not swing, the platform 3 does not move, and the medium-low frequency impact response spectrum measuring device 28 is not impacted, i.e. the impact stops.
Finally, the motor 7 is turned on again to rotate the gear 19 in the direction shown in fig. 11, the sliding table 16 is driven by the rack 18 to return the moving cam 17 to the initial position, and the swing push rod 12 is also returned to the initial position for use again.
In the process of detecting the precision of the low-medium frequency impact response spectrum measuring equipment, when the roller 12-2 moves in the initial straight-line segment 17-1 of the moving cam, the moving cam 17 is accelerated from a stop state to a stable uniform motion state; when the roller 12-2 moves in the push section 17-2 of the moving cam, the low-medium frequency impact response spectrum measuring equipment 28 begins to be impacted; when the roller 12-2 stops moving in the straight line segment 17-3 of the moving cam, the medium and low frequency impact response spectrum measuring equipment 28 stops being impacted, and the moving cam 17 decelerates from a uniform motion state to stop. In the process, displacement response data in the impact process are collected through a sensor on the medium and low frequency impact response spectrum measuring equipment 28, meanwhile, a spring and mass unit model which is the same as that of the medium and low frequency impact response spectrum measuring equipment is used, computer simulation calculation is carried out under the condition of standard impact load which is the same as that of a push stroke section of the moving cam, relative displacement response under the action of the standard impact load, namely a simulation numerical value of the measured geometric quantity, is obtained, and the precision of the medium and low frequency impact response spectrum measuring equipment is obtained by comparing the collected response data with the simulation numerical value.
The impact load of the impact testing machine at the present stage can only be approximate to a sine acceleration motion law, and if data acquired by the testing machine is compared with a computer simulation result under a standard sine impact load working condition and used for calibrating or detecting the precision of the low-and-medium-frequency impact response spectrum measuring equipment, a larger error exists. The utility model is explained in the foregoing description, the acceleration load generated by the action of the push section of the moving cam is the sine acceleration motion law, and the basis for detecting the accuracy of the low-and-medium-frequency impact response spectrum measuring equipment by the device of the utility model is credible.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the above embodiments, it will be understood by those of ordinary skill in the art that: modifications are made to the technical solutions described in the above embodiments, or some or all of the technical features are equivalently replaced, without departing from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. An apparatus for detecting the accuracy of a medium-low frequency impulse response spectrum measuring device is characterized in that: a guide rail (14) is fixedly arranged on the inner surface of a base (1) of the device, a sliding table (16) is connected on the guide rail (14) in a sliding manner, and a moving cam (17) and a rack (18) are sequentially and fixedly arranged on the sliding table (16); the surface of the upper end of the base (1) is fixedly provided with a guide seat (4), a bearing in a center hole of the guide seat (4) is connected with a vertical push rod (8), the upper end of the vertical push rod (8) is fixedly connected with a platform (3), medium-low frequency response spectrum measuring equipment (28) is placed on the platform (3), the lower end of the vertical push rod (8) is in pin joint with the middle part of a swinging push rod (12), one end of the swinging push rod (12) is in pin joint with the lower surface of the guide seat (4), and the other end of the swinging push rod (12) is in sliding connection with the upper surface of a movable cam (17); the rack (18) is engaged with a gear (19), the gear (19) is fixed on a shaft (23), two ends of the shaft (23) are connected with a side wall bearing of the base (1), one end part of the shaft (23) is connected with the motor (7), and the motor (7) is fixedly installed on the base (1).
2. The apparatus for detecting the accuracy of the middle and low frequency impulse response spectrum measuring device according to claim 1, wherein: the oscillating push rod (12) comprises: the device comprises a swinging push rod body (12-1), a roller (12-2), a roller pin shaft (12-3), a vertical push rod pin shaft (12-4) and a swinging pin shaft (12-5), wherein the middle part of the swinging push rod body (12-1) is provided with a strip hole, the strip hole is connected with the vertical push rod pin shaft (12-4) in a sliding manner, and the vertical push rod pin shaft (12-4) is connected with a vertical push rod (8); one end of the swing push rod body (12-1) is provided with a roller (12-2) through a roller pin shaft (12-3), and the roller (12-2) is connected with the upper surface of the movable cam (17) in a sliding way; the other end of the swing push rod body (12-1) is provided with a swing pin shaft (12-5), and the swing pin shaft (12-5) is connected with the lower surface of the guide seat (4).
3. The apparatus for detecting the accuracy of the middle and low frequency impulse response spectrum measuring device according to claim 1, wherein: the upper surface of the moving cam (17) is sequentially provided with an initial straight-line segment (17-1), a push-stroke segment (17-2) and a stop straight-line segment (17-3), the initial straight-line segment (17-1) and the stop straight-line segment (17-3) are straight-line segments, and the push-stroke segment (17-2) is obtained according to a motion equation of an ideal acceleration impact load curve of a sine curve.
4. The apparatus for detecting the accuracy of the middle and low frequency impulse response spectrum measuring device according to claim 1, wherein: an anti-rotation flat key (10) is arranged between the platform (3) and the vertical push rod (8).
5. The apparatus for detecting the accuracy of the middle and low frequency impulse response spectrum measuring device according to claim 1, wherein: the base (1) is of a trapezoidal groove body structure with a rectangular groove body arranged inside, and a plurality of grooves (1-1) are formed in the outer walls of the two sides of the base (1); the opening parts at the two ends of the base (1) are fixed with end cover plates (6), and the opening parts at the upper end of the base (1) are sequentially and fixedly provided with a first cover plate (2), a guide seat (4) and a second cover plate (5) so as to form a closed structure.
6. The apparatus for detecting the accuracy of the middle and low frequency impulse response spectrum measuring device according to claim 5, wherein: the end cover plate (6) is provided with a limiting block (13).
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| CN202122694070.XU CN216248032U (en) | 2021-11-05 | 2021-11-05 | Device for detecting precision of low-medium frequency impulse response spectrum measuring equipment |
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| CN202122694070.XU CN216248032U (en) | 2021-11-05 | 2021-11-05 | Device for detecting precision of low-medium frequency impulse response spectrum measuring equipment |
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