CN2413285Y

CN2413285Y - Improved magnet seat

Info

Publication number: CN2413285Y
Application number: CN 00216747
Authority: CN
Inventors: 胡子俭
Original assignee: Shanghai Institute of Ceramics of CAS
Current assignee: Shanghai Institute of Ceramics of CAS
Priority date: 2000-03-08
Filing date: 2000-03-08
Publication date: 2001-01-03
Anticipated expiration: 2010-03-08

Abstract

The utility model provides an improved magnet seat, which is characterized in that the utility model is fixed with a piezoelectric accelerometer through a central screw hole having inner screw threads; the utility model is the novel magnet seat for the use of the piezoelectric accelerometer having a central fixing structure, and belongs to the field of vibration transducers; the novel magnet seat is suitable for the piezoelectric accelerometer having the central fixing structure instead of a bottom screw thread fixing structure, and can be used with the piezoelectric accelerometer having the central fixing structure; thus, the utility model has the advantage of convenience, quickness, and is suitable for the online inspection and monitoring of devices.

Description

A kind of through improved iron-absorbing base

The utility model relates to a kind of through improved iron-absorbing base, more precisely by the center pit structure on the iron-absorbing base is improved, carry out fixing with internal thread and piezoelectric accelerometer, can offer the novel iron-absorbing base of the piezoelectric accelerometer use of center fixation structure, belong to oscillation sensor field.

Any object all can have vibration, and whether the operation conditions of an object of big I reflection of vibratory output, an equipment is good.To the detection of vibratory output, almost relate to each engineering field.Detect vibration and just be unable to do without vibration-measuring sensor, piezoelectric accelerometer is one of wherein most widely used, that kind is maximum sensor.

Proper and the performance of the selection of piezoelectric accelerometer how, and is most important to accuracy, the fiduciary level of picking up tested signal.Because the accuracy of detection that can might have influence on testee as additional mass of piezoelectric accelerometer own, therefore, the general requirement of people is 1/10～1/50 of a testee weight as the quality of the accelerometer of primary instrument.In addition, consider the convenience and the rapidity of detection, when the vibration frequency of testee is not higher than 2kHz, vibration acceleration is at 1000s ^-2M～2000s ^-2When m is following, the testing staff utilizes the bottom thread of accelerometer usually, piezoelectric accelerometer and iron-absorbing base are linked together, utilize the surface magnetism of iron-absorbing base, the metal surface that the subassembly of piezoelectric accelerometer and iron-absorbing base is adsorbed on testee is tested.The method of testing that this testing tool can suct apace and take down on equipment under test is that most of testing staff welcome and adopt.Another advantage of utilizing iron-absorbing base is need not attack the fixedly installation threaded hole of accelerometer in the metal surface of testee.

Fig. 1 is the present structural representation of common used iron-absorbing base, it only with general piezoelectric accelerometer logotype.1-piezoelectric accelerometer among the figure; The shell of 2-iron-absorbing base; The 3-medium filler; The 4-magnet steel; 5-shields worn-out sheet; The center screw of 6-band external thread iron-absorbing base.During use, take off the worn-out sheet of screen, the iron-absorbing base suction is got final product on the measured point of checkout equipment.Detection finishes, and the more worn-out sheet of screen is adsorbed on the surface of iron-absorbing base.This shows that what iron-absorbing base commonly used as shown in Figure 1 adopted is the externally threaded fixing means in center.

Yet, output can 360 ° of commutations, promptly the direction of output cable can be succeeded in developing by 360 ° of piezoelectric accelerometers that arbitrarily commutate, and application (application number: 99240355.3) has been proposed to Patent Office of the People's Republic of China, it is suitable for online detection and monitoring to equipment, especially the cable of exporting in the field requirement of some installations has directivity, or in the smaller occasion in the space at detected position.Output can 360 ° of commutations piezoelectric accelerometer uses is the method for center fixation.When the user selects the piezoelectric accelerometer that this output can 360 ° of commutations for use, and wish can load and unload when using at the scene convenient, in the time of adopting iron-absorbing base, the iron-absorbing base of structure just can not satisfy their requirement as shown in Figure 1.

It is a kind of novel through improved iron-absorbing base that the purpose of this utility model is to provide, and it is applicable to cooperate adopts the piezoelectric accelerometer of center fixation structure to detect.

The iron-absorbing base principal feature that the utility model provides is a shell through improving, and carries out fixingly with internal thread and piezoelectric accelerometer, provides a kind of loading and unloading easily, can offer the novel iron-absorbing base of the piezoelectric accelerometer use of center fixation structure.This novel iron-absorbing base can enlarge the range of application with the piezoelectric accelerometer of center fixation structure, helps online detection and monitoring to equipment, and quick, convenient and random occasion is wished to load and unload in the scene of some installations.

The purpose of this utility model is achieved in that will install and fix screw earlier passes central through hole with the piezoelectric accelerometer of center fixation structure, be screwed into gib screw in the center screw that has internal thread on the novel iron-absorbing base then and tighten, take off the worn-out sheet of screen, the iron-absorbing base suction is got final product on the measured point of checkout equipment.Detection finishes, and the more worn-out sheet of screen is adsorbed on the surface of iron-absorbing base.

The common this size that has the novel iron-absorbing base center screw of internal thread, central through hole on center fixation structure piezoelectric accelerometer is decided, the iron-absorbing base center screw is generally M3～M6, and the central through hole size of its size and center fixation structure piezoelectric accelerometer is suitable.Internal thread communicates with magnet steel, and the overall height of iron-absorbing base is 8～12mm.

Further illustrate characteristics of the present utility model and progress below in conjunction with accompanying drawing 2.Among the figure 3,4,5 is respectively medium filler, and magnet steel and the worn-out sheet of screen are identical with Fig. 1.And 7 among the figure adopts the piezoelectric accelerometer that the output of center fixation method can 360 ° of commutations, the 8th, and the shell of novel iron-absorbing base, the 9th, install and fix screw, the 10th, the center screw of band internal thread iron-absorbing base.Pass central through hole with gib screw 9 with the piezoelectric accelerometer 7 of center fixation method, be screwed into novel in the center screw 10 of improved band internal thread iron-absorbing base and tighten, the central through hole size of its size and center fixation structure piezoelectric accelerometer is suitable, the central through hole of the piezoelectric accelerometer that uses in the present embodiment is φ 3.5, then is of a size of M3 with the center screw on the internal thread iron-absorbing base.Center screw 10 communicates with magnet steel 4, and the overall height of iron-absorbing base is 10mm.Take off shield blade 5 during use, iron-absorbing base is inhaled on the measured point of checkout equipment, detection finishes, and shield blade 5 is adsorbed on the surface of iron-absorbing base again.

Claims

1. one kind comprises iron-absorbing base medium filler (3), magnet steel (4) and screen worn-out sheet (5) through improved iron-absorbing base, and its feature is at what:

(1) it is suitable to have a central through hole of piezoelectric accelerometer of center screw (10) size on the iron-absorbing base of internal thread and center fixation structure;

(2) internal thread of center screw (10) communicates with magnet steel (4) on the iron-absorbing base.

2. by the described iron-absorbing base of claim 1, its feature is generally M3～M6 at the internal thread of the described center screw of what.

3. by the described iron-absorbing base of claim 1, its feature is 8～12mm in the overall height of what iron-absorbing base.

4. by the described iron-absorbing base of claim 1, its feature is at what:

(1) installs and fixes screw (9) and pass central through hole with the piezoelectric accelerometer of center fixation structure;

(2) gib screw (9) is screwed in the center screw (10) of novel band internal thread iron-absorbing base and tightens.