Calibration device and method for radial vibration sensor universal for special rotating machinery

Abstract

The present invention discloses a universal radial vibration sensor calibration device and method for special rotating machinery. The calibration device includes a vibration sensor, and a calibration fixture, a sleeve, a fixed tube and a straight-in differential head connected in sequence; the calibration fixture is fixed on the outer cylinder of the rotating machinery; the vibration sensor is placed in the threaded through hole of the calibration fixture, the probe end extends into the outer cylinder of the rotating machinery, and the other end is connected to the threaded blind hole of the sleeve; one end of the sleeve is threadedly connected to the calibration fixture, and the other end is gap-matched with the fixed tube; the straight-in differential head contacts the end face of the sleeve; the calibration method is: (i) device assembly and initial inspection of the sensor; (ii) determination of the test starting point; (iii) calibration of the sensor; (iv) repeated calibration; and (v) data statistics. The present invention realizes the universality of the calibration device, screens out special rotating machinery with excessive vibration amplitude, improves the reliability of the operation of the special rotating machinery, greatly reduces the probability of equipment failure in professional equipment factories, and improves the efficiency of the factory.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary machinery sensor calibration, and in particular relates to a radial vibration sensor calibration device and method universal for special rotary machinery. Background Art

[0002] Special rotating machinery has developed multiple generations of models, which have the characteristics of high speed and non-maintenance, which requires the rotating machinery to have high reliability. In order to make the processed machine have better reliability, it is necessary to measure its vibration amplitude during the development stage of the rotating machinery. If the vibration amplitude is too large, it will directly affect the safety of the machine operation. At present, the vibration of rotating machinery is mainly measured by vibration sensors installed in the radial direction of the rotating machinery. The particularity of the material and the interference of the vibration sensor by the internal magnetic field of the rotating machinery will have a certain impact on the sensitivity of the sensor. The most ideal way to eliminate this influence is to calibrate the sensor on the rotating machinery on site. In this way, the calibrated sensitivity takes into account the influence of the measured object and the internal magnetic field, which can improve the test accuracy. However, due to the inconsistency of the size of each model, different sensor calibration devices need to be used for the calibration of sensors of different models, which brings some problems to the consistency of the calibration results and the convenience of calibration. In order to achieve the consistency and convenience of the calibration of sensors of different models, it is urgent to invent a radial vibration sensor calibration device and method that can be used for different models, which is of great significance to improve the vibration test accuracy of special rotating machinery. Summary of the invention

[0003] The present invention is proposed in view of specific needs and the lack of existing test conditions, and its purpose is to provide a radial vibration sensor calibration device and method universal for special rotating machinery.

[0004] The present invention is achieved through the following technical solutions:

[0005] A radial vibration sensor calibration device universal for special rotating machinery comprises a vibration sensor, and also comprises a calibration fixture, a sleeve, a fixed tube and a straight-in type differential head which are connected in sequence; the calibration fixture is fixed on the outer cylinder of the rotating machinery; the vibration sensor is placed in a threaded through hole of the calibration fixture, with its probe end extending into the outer cylinder of the rotating machinery and the other end connected to the threaded blind hole of the sleeve; one end of the sleeve is inserted into the threaded through hole of the calibration fixture, and the other end is inserted into the stepped hole of the fixed tube; the differential head of the straight-in type differential head extends into the fixed tube and contacts with the end face of the sleeve.

[0006] In the above technical solution, the vibration sensor is an eddy current displacement sensor.

[0007] In the above technical solution, the calibration seat is a cylindrical structure with a threaded through hole in the middle and a convex ring at one end. The convex ring has multiple mounting holes evenly distributed along the circumference. The fixed assembly between the calibration seat and the outer cylinder of the rotating machinery is achieved through the mounting holes and connecting parts.

[0008] In the above technical solution, a threaded blind hole is formed at one end of the sleeve, and an outer wall of the sleeve at this end forms an external thread that matches the threaded through hole.

[0009] In the above technical solution, the fixing tube is a locking fixing tube.

[0010] In the above technical solution, the fixed tube includes a tube body and a locking nut, a stepped hole is formed in the middle of the tube body, and the locking nut is arranged outside one end of the tube body connected to the straight-in type micrometer head.

[0011] In the above technical solution, the sleeve is clearance-matched with the large-diameter end of the stepped hole of the fixed pipe.

[0012] In the above technical solution, the clearance fit is a H7 / h6 small clearance fit.

[0013] A method for calibrating a radial vibration sensor universal for a special rotating machinery comprises the following steps:

[0014] (i) Device assembly and initial sensor inspection

[0015] Complete the assembly of the calibration device and the outer cylinder of the rotating machine, turn on the power switch, and use a multimeter to check whether the output voltage of the vibration sensor changes within 0V~10V;

[0016] (ii) Determine the starting point of the test

[0017] The torsional direct differential head takes the vibration sensor as the starting point when it contacts the rotating mechanical surface, and uses a multimeter to measure the voltage value at this time;

[0018] (iii) Calibrate the sensor

[0019] The torsion straight-through differential head makes the vibration sensor away from the rotor surface. Within the measuring range of the vibration sensor, the voltage value is read once with a multimeter every time the vibration sensor moves a certain distance from the rotor surface.

[0020] (iv) Repeat calibration

[0021] According to the method of steps (ii, iii), the vibration sensor is tested for multiple cycles of forward and reverse strokes;

[0022] (v) Statistics

[0023] Take data from 10% to 90% of the range, and list the obtained output and input test data in a table or draw a curve.

[0024] In the above technical solution, in the step (iii) of calibrating the sensor, the voltage value is read once with a multimeter every time the vibration sensor moves 0.5 mm from the rotor surface.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a universal radial vibration sensor calibration device and method for special rotating machinery, so as to realize accurate measurement of vibration sensors in rotating machinery. The present invention selects corresponding calibration fixtures according to the special rotating machinery model, so as to achieve the universality of the radial vibration sensor calibration device for special rotating machinery, and calibrates qualified vibration sensors through the device, so that the special rotating machinery is operated at a certain speed and the vibration change of the rotor is measured during the operation, and the special rotating machinery with excessive vibration amplitude is screened out, so as to improve the reliability of the operation of the special rotating machinery, greatly reduce the probability of equipment failure in the professional equipment factory, and improve the efficiency of the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a radial vibration sensor calibration device universal for special rotating machinery of the present invention;

[0028] Figure 2 It is a cross-sectional view of the calibration fixture in Embodiment 1 of the universal radial vibration sensor calibration device for special rotating machinery of the present invention;

[0029] Figure 3 It is a top view of the calibration fixture in Embodiment 1 of the universal radial vibration sensor calibration device for special rotating machinery of the present invention;

[0030] Figure 4 It is a cross-sectional view of the calibration fixture in Embodiment 2 of the universal radial vibration sensor calibration device for special rotating machinery of the present invention;

[0031] Figure 5 It is a top view of the calibration seat in Example 2 of the radial vibration sensor calibration device for special rotating machinery of the present invention.

[0032] in:

[0033] 1 Vibration sensor

[0034] 2 Calibration fixture

[0035] 21 convex ring 22 threaded through hole

[0036] 23 Mounting holes

[0037] 3 Casing

[0038] 31 Threaded blind hole

[0039] 4 Fixed pipe

[0040] 41 Tube 42 Locking nut

[0041] 5 Straight-through micrometer head

[0042] 6 Rotating mechanical outer cylinder

[0043] 7 Rotating machinery.

[0044] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the radial vibration sensor calibration device and method for special rotating machinery of the present invention will be further explained below in conjunction with the accompanying drawings and through specific implementation methods.

[0046] Example 1

[0047] like Figure 1 As shown, a radial vibration sensor calibration device universal for special rotating machinery includes a vibration sensor 1, and a calibration base 2, a sleeve 3, a fixing tube 4 and a straight-in differential head 5 connected in sequence.

[0048] The vibration sensor 1 is an eddy current displacement sensor, which is placed in the threaded through hole 22 of the calibration base 2, with its probe end extending into the outer cylinder 6 of the rotating machine, and the other end connected to the threaded blind hole 31 of the sleeve 3.

[0049] The calibration fixture 2 is fixed on the outer cylinder 6 of the rotating machine; its structure is as follows Figure 2 , 3 As shown, it is a cylindrical structure with a threaded through hole 22 formed in the middle, a convex ring 21 formed at one end, and a plurality of mounting holes 23 evenly distributed along the circumference formed on the convex ring, and the fixed assembly between the calibration fixture 2 and the rotating machine outer cylinder 6 is realized through the mounting holes 23 and the connecting piece. The calibration fixture 2 is a replaceable design, and a four-hole calibration fixture and a three-hole calibration fixture can be replaced according to different models. In this embodiment, the number of mounting holes 23 is three.

[0050] The sleeve 3 is a circumferential structure with a threaded blind hole 31 formed at one end, and the outer wall of the sleeve 3 at the end of the threaded blind hole 31 forms an external thread that matches the threaded through hole 22; one end of the sleeve 3 is inserted into the threaded through hole 22 of the calibration fixture 2, and the other end is inserted into the stepped hole of the fixed tube 4, and matches with the H7 / h6 small clearance at the large diameter end of the stepped hole; the threaded through hole 22 of the sleeve 3 realizes the fixing effect on the vibration sensor 1, and the external thread of the outer wall can change the distance between the vibration sensor 1 and the object to be calibrated (rotating machinery 7) by screwing in and out. The H7 / h6 small clearance matching mode between the sleeve 3 and the fixed tube 4 can ensure the centering while having the function of adjusting the distance.

[0051] The fixing tube 4 is a locking fixing tube, and the fixing tube 4 includes a tube body 41 and a locking nut 42 . A stepped hole is formed in the middle of the tube body 41 , and the locking nut 42 is arranged outside one end of the tube body 41 connected to the straight-in type micrometer head 5 .

[0052] The differential head of the straight-in differential head 5 extends into the fixed tube 4 and contacts the end face of the sleeve 3. By adjusting the differential head, the sleeve 3 can be controlled to move a certain distance in the fixed tube 4, thereby realizing the calibration function of the special rotating machinery 7.

[0053] Example 2

[0054] Based on Example 1, in order to adapt to different machine models, the structure of the calibration fixture (2) is as follows: Figure 4 , 5 As shown, in this embodiment, the number of mounting holes (23) is four.

[0055] Example 3

[0056] Based on Example 1, a radial vibration sensor calibration method for a dedicated rotating machine includes the following steps:

[0057] (i) Device assembly and initial sensor inspection

[0058] Select the corresponding calibration fixture 2 according to the special rotating machinery 7 model, according to Figure 1 , install the vibration sensor calibration device on the rotating machine outer cylinder 6 which has been installed in the rotating machine 7, turn on the power switch, and use a multimeter to check whether the output voltage of the eddy current displacement sensor can change within 0V~10V;

[0059] (ii) Determine the starting point of the test

[0060] The torsional direct differential head takes the vibration sensor as the starting point when it contacts the rotating mechanical surface, and uses a multimeter to measure the voltage value at this time;

[0061] (iii) Calibrate the sensor

[0062] The torsion straight-through differential head moves the vibration sensor away from the rotor surface. Within the 4mm measuring range of the vibration sensor, the voltage value is read once with a multimeter every time the vibration sensor moves 0.5mm from the rotor surface.

[0063] (iv) Repeat calibration

[0064] According to the method in steps (ii, iii), the vibration sensor is tested for three cycles of forward and reverse strokes;

[0065] (v) Statistics

[0066] Take data from 10% to 90% of the range, and list the obtained output and input test data in a table or draw a curve.

[0067] The present invention provides a universal radial vibration sensor calibration device and method for special rotating machinery, so as to realize accurate measurement of vibration sensors in rotating machinery. The present invention selects corresponding calibration fixtures according to the special rotating machinery model, so as to achieve the universality of the radial vibration sensor calibration device for special rotating machinery, and calibrates qualified vibration sensors through the device, so that the special rotating machinery is operated at a certain speed and the vibration change of the rotor is measured during the operation, and the special rotating machinery with excessive vibration amplitude is screened out, so as to improve the reliability of the operation of the special rotating machinery, greatly reduce the probability of equipment failure in the professional equipment factory, and improve the efficiency of the factory.

[0068] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0071] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A radial vibration sensor calibration device for special rotating machinery, comprising a vibration sensor (1), characterized in that: It also includes a calibration fixture (2), a sleeve (3), a fixed tube (4) and a straight-through differential head (5) connected in sequence; the calibration fixture (2) is fixed on the outer cylinder (6) of the rotating machine; the vibration sensor (1) is placed in the threaded through hole (22) of the calibration fixture (2), the probe end of the vibration sensor extends into the outer cylinder (6) of the rotating machine, and the other end of the vibration sensor is connected to the threaded blind hole (31) of the sleeve (3); one end of the sleeve (3) is inserted into the threaded through hole (22) of the calibration fixture (2), and the other end is inserted into the stepped hole of the fixed tube (4); the differential head of the straight-through differential head (5) extends into the fixed tube (4) and contacts the end surface of the sleeve (3); The calibration fixture (2) is a cylindrical structure with a threaded through hole (22) formed in the middle, a convex ring (21) formed at one end, and a plurality of mounting holes (23) evenly distributed along the circumference formed on the convex ring (21). The mounting holes (23) and the connecting piece are used to realize the fixed assembly between the calibration fixture (2) and the outer cylinder (6) of the rotating machine. The calibration fixture (2) is designed to be replaceable, and a four-hole calibration fixture (2) and a three-hole calibration fixture (2) can be replaced according to different machine models.

2. The universal radial vibration sensor calibration device for special rotating machinery according to claim 1 is characterized in that: The vibration sensor (1) is an eddy current displacement sensor.

3. The universal radial vibration sensor calibration device for special rotating machinery according to claim 1 is characterized in that: A threaded blind hole (31) is formed at one end of the sleeve (3), and an outer wall of the sleeve (3) at this end forms an external thread that matches the threaded through hole (22).

4. The universal radial vibration sensor calibration device for special rotating machinery according to claim 1 is characterized in that: The fixing tube (4) is a locking type fixing tube.

5. The universal radial vibration sensor calibration device for special rotating machinery according to claim 4 is characterized in that: The fixed tube (4) comprises a tube body (41) and a locking nut (42); a stepped hole is formed in the middle of the tube body (41); and the locking nut (42) is arranged outside one end of the tube body (41) connected to the straight-through micrometer head (5).

6. The universal radial vibration sensor calibration device for special rotating machinery according to claim 1 is characterized in that: The sleeve (3) and the large diameter end of the stepped hole of the fixed tube (4) are clearance-matched.

7. The radial vibration sensor calibration device universal for special rotating machinery according to claim 6, characterized in that: The clearance fit is a H7 / h6 small clearance fit.

8. A calibration method using the universal radial vibration sensor calibration device for special rotating machinery according to any one of claims 1 to 7, characterized in that: The following steps are involved: (i) Device assembly and initial sensor inspection Complete the assembly of the calibration device and the outer cylinder of the rotating machine, turn on the power switch, and use a multimeter to check whether the output voltage of the vibration sensor changes within 0V~10V; (ii) Determine the starting point of the test The torsional direct differential head takes the vibration sensor as the starting point when it contacts the rotating mechanical surface, and uses a multimeter to measure the voltage value at this time; (iii) Calibrate the sensor The torsion straight-through differential head makes the vibration sensor away from the rotor surface. Within the measuring range of the vibration sensor, the voltage value is read once with a multimeter every time the vibration sensor moves a certain distance from the rotor surface. (iv) Repeat calibration According to the method of steps (ii, iii), the vibration sensor is tested for multiple cycles of forward and reverse strokes; (v) Statistics Take data from 10% to 90% of the range, and list the obtained output and input test data in a table or draw a curve.

9. The method for calibrating a radial vibration sensor universal for special rotating machinery according to claim 8, characterized in that: In the step (iii), the voltage value of the vibration sensor in the calibration sensor is read once with a multimeter every time the vibration sensor moves 0.5 mm from the rotor surface.

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