CN113776651A - Vibrating mirror swing motor natural frequency detection device - Google Patents
Vibrating mirror swing motor natural frequency detection device Download PDFInfo
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- CN113776651A CN113776651A CN202111063905.XA CN202111063905A CN113776651A CN 113776651 A CN113776651 A CN 113776651A CN 202111063905 A CN202111063905 A CN 202111063905A CN 113776651 A CN113776651 A CN 113776651A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The invention discloses a natural frequency detection device of a galvanometer swing motor, which comprises a detection table, wherein positioning blocks are fixedly arranged at the edges of two sides of the top end of a support plate, connecting shafts are respectively inserted into two ends of one side of each positioning block, two clamping pieces are respectively fixedly arranged at one end of each connecting shaft, a first spring is sleeved at one end of the outer wall of each connecting shaft, a moving shaft is respectively inserted into the middle position of one side of each positioning block, and a clamping ring is fixedly arranged at the middle position of one side of each positioning block. According to the natural frequency detection device for the vibrating mirror swing motor, the clamping pieces are moved until the rubber gaskets at the two ends contact the swing motor, then the threaded ring is rotated to be in threaded connection with the outer wall of the clamping ring, the movable shaft can be fixed after being in threaded connection with the clamping ring, and when the clamping device is contacted and clamped in the later period, the clamping pieces are bounced off by the loosened threaded ring under the elasticity of the first spring, so that the dissipation of vibration energy is avoided, and the detection quality of the device is improved.
Description
Technical Field
The invention relates to the technical field of natural frequency detection, in particular to a natural frequency detection device of a vibrating mirror swing motor.
Background
The traditional swing motor is mainly used as a device for vibration and vibration detection of production workpieces in the industry and machinery industry, and the types and models of the swing motors are many, the natural frequencies of the vibration motors of different types and models are different, the natural frequency is also called as natural frequency, when the object does free vibration, the displacement varies with time according to sine or cosine law, the frequency of vibration is independent of the initial conditions and only of the intrinsic characteristics of the system (such as mass, shape, material, etc.), called the natural frequency, the corresponding period is called the inherent period, the research on the inherent frequency is beneficial to ensuring the stability of the product, therefore, when the swing motor is produced and used in the later period, the inherent frequency of the swing motor needs to be measured so as to ensure that the tested swing motor can be applied to operation production in an application range;
in the prior art, when designing and manufacturing the natural frequency detection device of the vibrating mirror swing motor, most designers pay attention to the vibration strength of the device, so that the device has enough power to operate when measuring the frequency of the swing motors with different volumes and weights, but when measuring the fixed frequency, the free swing quality of the motor is mainly paid attention to, and the accuracy of measurement can be affected when the device is affected by external influences and the stability of the device is not high, so that the device needs a fixing structure capable of being freely adjusted to fix the device so that the device can carry out stable free vibration measurement.
Disclosure of Invention
The present invention is directed to a device for detecting the natural frequency of a galvanometer swing motor, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a natural frequency detection device of a galvanometer swing motor comprises a detection table, wherein a support plate is clamped at the middle position of the top end of the detection table, positioning blocks are fixedly arranged at the edges of two sides of the top end of the support plate, connecting shafts are arranged at two ends of one side of the two positioning blocks in an inserting mode, two clamping pieces are fixedly arranged at one ends of four connecting shafts, two ends of one side of each clamping piece are fixedly connected with one ends of the four connecting shafts respectively, rubber gaskets are fixedly arranged at the other sides of the two clamping pieces, first springs are sleeved at one ends of the outer walls of the four connecting shafts, one ends of the four first springs are fixedly connected with two ends of one side of the two positioning blocks respectively, the other ends of the four first springs are fixedly connected with two ends of one side of the two clamping pieces respectively, moving shafts are arranged at the middle position of one side of the two positioning blocks in an inserting mode, and one ends of the two moving shafts are fixedly connected with the middle positions of one sides of the two clamping pieces respectively, two the intermediate position of locating piece one side all fixes and is equipped with the snap ring, and the inner wall of two snap rings alternates with the outer wall of two removal axles respectively and be connected, two remove the axle outer wall and all overlap and be equipped with the screw ring, and one side of two screw ring inner walls respectively with the outer wall threaded connection of two removal axles, the opposite side of two screw ring inner walls respectively with the outer wall threaded connection of two snap rings.
Preferably, two the other end of removal axle all is fixed and is equipped with first handle, the edge of examining test table top both sides all is fixed and is equipped with the support frame, and the both ends of support frame bottom respectively with examine the both sides fixed connection on test table top.
Preferably, a first chute is formed in the middle of one side of the top end of the support frame, second chutes are formed in two sides of the inner wall of the first chute, a support block is clamped on the inner wall of the first chute, and outer walls at two ends of the support block are respectively connected with the inner walls of the two second chutes in a sliding mode.
Preferably, a screw rod is inserted into the inner wall of one side of the supporting block, the outer wall of the screw rod is in threaded connection with the inner wall of the supporting block, a first fixing disc is fixedly arranged at one end of the screw rod, and a second spring is fixedly arranged on one side of the first fixing disc.
Preferably, the fixed second fixed disk that is equipped with of one end of second spring, the draw-in groove has all been seted up at the both ends of second fixed disk one side, two the equal block of inner wall of draw-in groove is equipped with the slider, two the one end of slider is all fixed and is equipped with the arc card strip, two one side of slider all alternates and is equipped with the fixed axle, and the one end of two fixed axles passes the inner wall way Wavenn on one side of draw-in groove and is connected of one side of two sliders respectively.
Preferably, the middle position block on detecting the platform top is equipped with the mounting groove, and the outer wall of backup pad one end is connected with the inner wall block of mounting groove one end, first card hole has been seted up to the middle position of mounting groove inner wall bottom, the inner wall block in first card hole is equipped with electric telescopic handle, the middle position of electric telescopic handle one side is seted up flutedly.
Preferably, four edges of mounting groove inner wall bottom all fix and are equipped with the third spring, four the top of third spring all is fixed and is equipped with the stationary blade, and one side of four stationary blades respectively with four edges fixed connection of backup pad opposite side.
Preferably, the fixed stopper that is equipped with in intermediate position of backup pad opposite side, and the outer wall of stopper and the inner wall block of recess are connected, the second card hole has been seted up to the intermediate position of stopper one side, the fixed block that is equipped with in edge of backup pad opposite side one end, the top edge department of examining test table outer wall one side alternates and is equipped with the card fixed axle, and the outer wall of card fixed axle one end passes the inner wall of examining test table one side and is connected with the inner wall block of fixed block one side, the fixed second handle that is equipped with in one end of card fixed axle.
Preferably, the opposite side of examining test table outer wall is fixed and is equipped with flush mounting plate of switch, the electric telescopic handle switch has been seted up to one side of flush mounting plate of switch, and electric telescopic handle passes through electric telescopic handle switch and external power supply electric connection.
The invention has the technical effects and advantages that:
(1) according to the invention, the device is provided with the vibration clamping structure which mainly comprises the positioning block, the connecting shaft, the clamping piece, the rubber gasket, the first spring, the moving shaft, the clamping ring, the threaded ring, the first handle and the like, the moving shaft is pushed by the first handle, the clamping piece is moved until the rubber gaskets at two ends contact with the swing motor, then the threaded ring is rotated to be in threaded connection with the outer wall of the clamping ring, the threaded ring and the moving shaft are also in threaded connection, so that the moving shaft can be fixed after being in threaded connection with the clamping ring, and when the clamping is contacted and clamped in the later period, the clamping piece is flicked under the elasticity of the first spring by loosening the threaded ring, the clamping and fixing of the motor are released, the dissipation of vibration energy is not generated, and the detection quality of the device is improved;
(2) according to the invention, the auxiliary detection structure with a protection effect is arranged on the device, and the structure mainly comprises the support frame, the first sliding groove, the second sliding groove, the support block, the screw rod, the second spring, the second fixing piece, the arc-shaped clamping strip, the clamping groove and the like, the length of the structure is adjusted by rotating the screw rod, so that the outer wall of the motor can be stably clamped when the arc-shaped clamping strip moves in the clamping groove, then the structure can vibrate along with the motor when the vibration structure at the lower end of the detection table vibrates, and the second spring at the upper end of the structure can keep the same vibration frequency with the motor when the vibration structure vibrates, so that the structure does not influence the value of the inherent frequency of the detection motor, and plays a role in protection stability, thereby improving the protection performance of the device;
(3) the device is provided with the vibration detection structure, and the structure mainly comprises a supporting plate, a mounting groove, an electric telescopic rod, a third spring, a fixing piece, a limiting block, a fixing block, a clamping shaft and the like, wherein the electric telescopic rod is started to jack the supporting plate, the clamping shaft penetrates through the inner wall of the fixing block to support the fixing block, the electric telescopic rod is contracted, and then the clamping shaft is rapidly pulled out, so that the supporting plate regularly vibrates up and down under the support of the third spring and the fixing piece, the motor also vibrates along with the fixing shaft, and the detection platform can detect the natural frequency of the swing motor, so that the practicability of the device is improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic view of the clamping piece and the movable shaft of the present invention.
FIG. 3 is a schematic view of the structure of the arc-shaped clamping strip and the second spring for assisting clamping measurement according to the present invention.
Fig. 4 is a schematic view of the vibration detection structure of the electric telescopic rod and the third spring according to the present invention.
Fig. 5 is a schematic structural view of the locking shaft and the stopper of the present invention.
In the figure: 1. a detection table; 2. a support plate; 3. positioning blocks; 4. a connecting shaft; 5. a clip; 6. a rubber gasket; 7. a first spring; 8. a movable shaft; 9. a snap ring; 10. a threaded ring; 11. a first grip; 12. a support frame; 13. a first chute; 14. a second chute; 15. a support block; 16. a screw; 17. a first fixed disk; 18. a second spring; 19. a second fixed disk; 20. a card slot; 21. a slider; 22. an arc-shaped clamping strip; 23. mounting grooves; 24. a first card hole; 25. an electric telescopic rod; 26. a third spring; 27. a fixing sheet; 28. a limiting block; 29. a second card hole; 30. a fixed block; 31. clamping a fixed shaft; 32. a second grip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a natural frequency detection device of a vibrating mirror swing motor as shown in figures 1-5, which comprises a detection table 1, a first handle 11 is fixedly arranged at the other end of each of two movable shafts 8, a support frame 12 is fixedly arranged at the edge of each of two sides of the top end of the detection table 1, and the two ends of the bottom of the support frame 12 are respectively fixedly connected with the two sides of the top end of the detection platform 1, the middle position of one side of the top end of the support frame 12 is provided with a first chute 13, the two sides of the inner wall of the first chute 13 are both provided with a second chute 14, the inner wall of the first chute 13 is clamped with a supporting block 15, the outer walls of the two ends of the supporting block 15 are respectively connected with the inner walls of the two second sliding grooves 14 in a sliding mode, the other side of the outer wall of the detection table 1 is fixedly provided with a switch panel, one side of the switch panel is provided with an electric telescopic rod switch, and the electric telescopic rod 25 is electrically connected with an external power supply through the electric telescopic rod switch;
as shown in fig. 2, a supporting plate 2 is clamped at the middle position of the top end of a detection table 1, positioning blocks 3 are fixedly arranged at the edges of the two sides of the top end of the supporting plate 2, connecting shafts 4 are inserted at the two ends of one side of each of the two positioning blocks 3, two clamping pieces 5 are fixedly arranged at one ends of the four connecting shafts 4, the two ends of one side of each of the two clamping pieces 5 are fixedly connected with one ends of the four connecting shafts 4, rubber gaskets 6 are fixedly arranged at the other sides of the two clamping pieces 5, first springs 7 are sleeved at one ends of the outer walls of the four connecting shafts 4, one ends of the four first springs 7 are fixedly connected with the two ends of one side of each of the two positioning blocks 3, the other ends of the four first springs 7 are fixedly connected with the two ends of one side of each of the two clamping pieces 5, moving shafts 8 are inserted at the middle position of one side of each of the two positioning blocks 3, and one ends of the two moving shafts 8 are fixedly connected with the middle positions of one sides of the two clamping pieces 5, the middle positions of one sides of the two positioning blocks 3 are respectively fixedly provided with a clamping ring 9, the inner walls of the two clamping rings 9 are respectively and alternately connected with the outer walls of the two moving shafts 8, the outer walls of the two moving shafts 8 are respectively sleeved with a threaded ring 10, one side of the inner wall of each threaded ring 10 is respectively in threaded connection with the outer wall of each moving shaft 8, and the other side of the inner wall of each threaded ring 10 is respectively in threaded connection with the outer wall of each clamping ring 9;
as shown in fig. 3, a screw 16 is inserted into an inner wall of one side of the support block 15, an outer wall of the screw 16 is in threaded connection with the inner wall of the support block 15, a first fixed disk 17 is fixed at one end of the screw 16, a second spring 18 is fixed at one side of the first fixed disk 17, a second fixed disk 19 is fixed at one end of the second spring 18, clamping grooves 20 are respectively formed at two ends of one side of the second fixed disk 19, sliding blocks 21 are respectively clamped on inner walls of the two clamping grooves 20, arc-shaped clamping strips 22 are respectively fixed at one ends of the two sliding blocks 21, fixed shafts are inserted into one sides of the two sliding blocks 21, and one ends of the two fixed shafts respectively penetrate through one sides of the two sliding blocks 21 to be in threaded connection with the inner wall of one side of the clamping grooves 20;
as shown in fig. 4, a mounting groove 23 is clamped at the middle position of the top end of the detection table 1, the outer wall of one end of the support plate 2 is clamped and connected with the inner wall of one end of the mounting groove 23, a first clamping hole 24 is formed at the middle position of the bottom of the inner wall of the mounting groove 23, an electric telescopic rod 25 is clamped and arranged at the inner wall of the first clamping hole 24, a groove is formed at the middle position of one side of the electric telescopic rod 25, third springs 26 are fixedly arranged at four corners of the bottom of the inner wall of the mounting groove 23, fixing plates 27 are fixedly arranged at the top ends of the four third springs 26, and one sides of the four fixing plates 27 are fixedly connected with four corners of the other side of the support plate 2 respectively;
as shown in fig. 5, the fixed stopper 28 that is equipped with in intermediate position of backup pad 2 opposite side, and the outer wall of stopper 28 and the inner wall block of recess are connected, second card hole 29 has been seted up to the intermediate position of stopper 28 one side, the fixed block 30 that is equipped with in edge of backup pad 2 opposite side one end, the top edge department of examining 1 outer wall one side of test table alternates and is equipped with the card fixed axle 31, and the outer wall of card fixed axle 31 one end passes the inner wall of examining 1 one side of test table and is connected with the inner wall block of fixed block 30 one side, the fixed second handle 32 that is equipped with in one end of card fixed axle 31.
The working principle of the invention is as follows: when the device for detecting the natural frequency of the vibrating mirror swinging motor in the design scheme is used, firstly, the swinging motor which needs to be measured is placed at the upper end of the supporting plate 2, the placing position is adjusted to enable the fixing structure at the upper end of the device to fix the device, in the design scheme, the vibrating clamping structure which is composed of the positioning block 3, the connecting shaft 4, the clamping piece 5, the rubber gasket 6, the first spring 7, the moving shaft 8, the clamping ring 9, the threaded ring 10, the first handle 11 and the like is arranged, when the device is used, the moving shaft 8 is pushed through the first handle 11, the clamping piece 5 is moved until the rubber gaskets 6 at the two ends are contacted with the swinging motor, then the threaded ring 10 is rotated to be in threaded connection with the outer wall of the clamping ring 9, and because the threaded ring 10 is also in threaded connection with the moving shaft 8, the moving shaft 8 can be fixed after being in threaded connection with the clamping ring 9, when in later contact clamping, the loosening threaded ring 10 springs the clamping piece 5 open under the elasticity of the first spring 7, the clamping and fixing of the motor are released, the vibration amplitude of the swing motor is not influenced during clamping, the swing motor is enabled to be more stable when vibrating on the supporting plate 2, and the dissipation of vibration energy is not easy to generate, so that the detection quality of the device is improved, an auxiliary detection structure with a protection effect is arranged on the device, the auxiliary detection structure comprises a supporting frame 12, a first sliding groove 13, a second sliding groove 14, a supporting block 15, a screw rod 16, a second spring 18, a second fixed disc 19, an arc-shaped clamping strip 22, a clamping groove 20 and the like, when in use, the screw rod 16 is rotated to adjust the length of the structure, so that the arc-shaped clamping strip 22 can stably clamp the outer wall of the motor when moving in the clamping groove 20, and then the structure can vibrate along with the motor when vibrating through the vibration structure at the lower end of the detection table 1, and the second spring 18 of the upper end of the structure can keep the same vibration frequency with it when vibrating, therefore the structure does not influence the numerical value of the natural frequency of the detection motor, and play a role of protecting stably, thus improve the protection of the apparatus, and there is a vibration detection structure composed of the support plate 2, the mounting groove 23, the electric telescopic rod 25, the third spring 26, the fixing piece 27, the stopper 28, the fixing piece 30 and the locking shaft 31 on the apparatus, when in use, after the motor is placed on the support plate 2 and fixed, the electric telescopic rod 25 is started to jack up the support plate 2, the locking shaft 31 is inserted into the inner wall of the fixing piece 30 to support it, the electric telescopic rod 25 is contracted, then the locking shaft 31 is pulled out rapidly, so that the support plate 2 vibrates up and down regularly under the support of the third spring 26 and the fixing piece 27, and the motor also vibrates therewith, the detection table 1 can detect the natural frequency of the swing motor, and the output end of the swing motor with the rotating shaft can be inserted into the second clamping hole 29, so that the normal measurement of the device is not influenced, and the practicability of the device is improved.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "secured" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integral to; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The standard parts used by the invention can be purchased from the market, and the special-shaped parts can be customized according to the description and the description of the attached drawings.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The natural frequency detection device of the vibrating mirror swing motor comprises a detection table (1) and is characterized in that a support plate (2) is clamped at the middle position of the top end of the detection table (1), positioning blocks (3) are fixedly arranged at the edges of two sides of the top end of the support plate (2), connecting shafts (4) are arranged at two ends of one side of each positioning block (3) in an inserting mode, two clamping pieces (5) are fixedly arranged at one ends of the four connecting shafts (4), two ends of one side of each clamping piece (5) are fixedly connected with one ends of the four connecting shafts (4), rubber gaskets (6) are fixedly arranged at the other sides of the two clamping pieces (5), first springs (7) are sleeved at one ends of the outer walls of the four connecting shafts (4), one ends of the four first springs (7) are fixedly connected with two ends of one side of the two positioning blocks (3) respectively, the other end of four first springs (7) respectively with the both ends fixed connection of two clamping pieces (5) one side, two the intermediate position of locating piece (3) one side all alternates and is equipped with removal axle (8), and the one end of two removal axles (8) respectively with the intermediate position fixed connection of two clamping pieces (5) one side, two the intermediate position of locating piece (3) one side all fixes and is equipped with snap ring (9), and the inner wall of two snap rings (9) alternates with the outer wall of two removal axles (8) respectively and is connected, two it all overlaps to be equipped with threaded ring (10) to remove axle (8) outer wall, and one side of two threaded ring (10) inner walls respectively with the outer wall threaded connection of two removal axles (8), the opposite side of two threaded ring (10) inner walls respectively with the outer wall threaded connection of two snap rings (9).
2. The device for detecting the natural frequency of the vibrating mirror swinging motor according to claim 1, wherein a first handle (11) is fixedly arranged at the other end of each of the two moving shafts (8), a support frame (12) is fixedly arranged at the edge of each of the two sides of the top end of the detection table (1), and the two ends of the bottom of the support frame (12) are respectively and fixedly connected with the two sides of the top end of the detection table (1).
3. The device for detecting the natural frequency of the vibrating mirror oscillating motor according to claim 2, wherein a first sliding groove (13) is formed in the middle of one side of the top end of the supporting frame (12), second sliding grooves (14) are formed in both sides of the inner wall of the first sliding groove (13), a supporting block (15) is clamped on the inner wall of the first sliding groove (13), and the outer walls of both ends of the supporting block (15) are respectively connected with the inner walls of the two second sliding grooves (14) in a sliding manner.
4. The device for detecting the natural frequency of the vibrating mirror swinging motor according to claim 3, wherein a screw (16) is inserted into the inner wall of one side of the supporting block (15), the outer wall of the screw (16) is in threaded connection with the inner wall of the supporting block (15), a first fixed disc (17) is fixedly arranged at one end of the screw (16), and a second spring (18) is fixedly arranged at one side of the first fixed disc (17).
5. The device for detecting the natural frequency of the vibrating mirror oscillating motor according to claim 4, wherein a second fixed disk (19) is fixedly arranged at one end of the second spring (18), clamping grooves (20) are respectively formed at two ends of one side of the second fixed disk (19), sliding blocks (21) are respectively clamped on the inner walls of the two clamping grooves (20), arc-shaped clamping strips (22) are respectively fixedly arranged at one ends of the two sliding blocks (21), fixed shafts are respectively inserted into one sides of the two sliding blocks (21), and one ends of the two fixed shafts respectively penetrate through one sides of the two sliding blocks (21) to be in threaded connection with the inner walls of one sides of the clamping grooves (20).
6. The device for detecting the natural frequency of the vibrating mirror oscillating motor according to claim 2, wherein a mounting groove (23) is formed at the middle position of the top end of the detection table (1) in a clamping manner, the outer wall of one end of the support plate (2) is connected with the inner wall of one end of the mounting groove (23) in a clamping manner, a first clamping hole (24) is formed at the middle position of the bottom of the inner wall of the mounting groove (23), an electric telescopic rod (25) is arranged at the inner wall of the first clamping hole (24) in a clamping manner, and a groove is formed at the middle position of one side of the electric telescopic rod (25).
7. The device for detecting the natural frequency of the vibrating mirror swinging motor according to claim 6, wherein a third spring (26) is fixedly arranged at each of four corners of the bottom of the inner wall of the mounting groove (23), a fixing piece (27) is fixedly arranged at each of the top ends of the four third springs (26), and one side of each of the four fixing pieces (27) is fixedly connected with each of the four corners of the other side of the supporting plate (2).
8. The device for detecting the natural frequency of the vibrating mirror swing motor according to claim 7, wherein a limit block (28) is fixedly arranged at the middle position of the other side of the support plate (2), the outer wall of the limit block (28) is connected with the inner wall of the groove in a clamping manner, a second clamping hole (29) is formed at the middle position of one side of the limit block (28), a fixed block (30) is fixedly arranged at the edge of one end of the other side of the support plate (2), a clamping shaft (31) is inserted and arranged at the upper edge of one side of the outer wall of the detection table (1), the outer wall of one end of the clamping shaft (31) penetrates through the inner wall of one side of the detection table (1) and is connected with the inner wall of one side of the fixed block (30) in a clamping manner, and a second handle (32) is fixedly arranged at one end of the clamping shaft (31).
9. The device for detecting the natural frequency of the vibrating mirror swinging motor according to claim 8, wherein a switch panel is fixedly arranged on the other side of the outer wall of the detection table (1), an electric telescopic rod switch is arranged on one side of the switch panel, and the electric telescopic rod (25) is electrically connected with an external power supply through the electric telescopic rod switch.
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| CN202111063905.XA CN113776651A (en) | 2021-09-10 | 2021-09-10 | Vibrating mirror swing motor natural frequency detection device |
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| CN202111063905.XA CN113776651A (en) | 2021-09-10 | 2021-09-10 | Vibrating mirror swing motor natural frequency detection device |
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