CN2222344Y

CN2222344Y - Vibration-damping type material level measuring sensor

Info

Publication number: CN2222344Y
Application number: CN 94219234
Authority: CN
Inventors: 张丽华; 李仁爽; 魏文光
Original assignee: DONGBEI ELECTRIC POWER TECHNOLOGY INST JILIN CITY
Current assignee: DONGBEI ELECTRIC POWER TECHNOLOGY INST JILIN CITY
Priority date: 1994-08-20
Filing date: 1994-08-20
Publication date: 1996-03-13
Anticipated expiration: 2004-08-20

Abstract

The utility model provides a vibration-damping type material level measuring sensor which is an apparatus for measuring material level, which is used in a large filler bin in a power plant or a flour plant, etc. The utility model comprises a bracket in a filler bin, and at least a vibrating assembly is arranged on the bracket. The vibrating assembly comprises a vibration guiding housing, and an inner bracket is fixed on the inner wall of the vibration guiding housing. A vibrating source which can generate mechanical vibration and a vibrating sensor are fixed on the inner bracket. The utility model adopts vibration stopping principle, and the reliability for measuring and sensing is high. The structure of the utility model is completely sealed, so the utility model can carry out detection under the high temperature and corrosive bad operating condition. The mechanical vibration generated by the utility model can solve the problem of the agglomerating of materials and the attachment of dust. The utility model is suitable for measuring the material level in a powdery bin, a grainy bin and a liquid bin.

Description

The vibration-damping type material level detects sensing device

The vibration-damping type material level that the utility model relates to level gauging in the large-scale filler bins of industry such as being used for power plant or flour mill detects sensing device.

The large-scale coal dust feed bin that present domestic power plant uses (general highly is 6-10 rice) level gauging adopts wire rope to hang the heavy method of heavy bucket mostly, and not only labour intensity is big for it, more can not realize continuous monitoring.Though came across some new measuring methods in recent years; As stall motor method, methods such as gamma-rays method and pressure sensing method, but because measurement environment is relatively poor (higher as temperature in the feed bin, coal dust easily lumps, factor affecting such as proportion is indefinite), these methods or equipment exist short and defectives such as poor reliability or cost height in serviceable life, so the coal dust bin-level of power plant detects the problem anxious to be solved that is still so far.

The utility model purpose is to provide a kind of vibration-damping type material level to detect sensing device, make every effort to make this device can overcome powder caking, proportion is indefinite, unfavorable factor influences such as card blockage detection device adapt to measurement environment, realize automatic monitor for continuously, improve the reliability of level gauging.

Realize that the technical scheme that above-mentioned purpose adopts is: this vibration-damping type material level detects sensing device, it is characterized in that: have the support that places in the feed bin, the support upper support has at least one vibration assembly, this vibration assembly includes leads the housing that shakes, lead on the inner walls of shaking and be fixed with inner support, be fixed with the vibration source and the vibration-measuring sensor that can produce mechanical vibration on the inner support.

This vibration-damping type material level detects sensing device has following advantage than known technology, and the technical program adopts and hinders the principle of shaking, and it is higher to detect the sensing reliability, satisfies the requirement of large-sized silo material level accuracy of detection fully; This apparatus structure all seals, and easily is implemented in high temperature, has and implement under the abominable situation of corrosion to detect.The vibration assembly is installed on the support cantilever and itself produces mechanical vibration and can solve material caking, dust attachment issue.It not only is applicable to the usefulness of granular material, the detection of bulk silo material level, also applicable to Level Detection.

Fig. 1 has provided the organigram of this vibration-damping type material level detection sensing device.

Fig. 2 is a vibration assembly organigram among Fig. 1.

Fig. 3 is that the A-A of Fig. 2 is to cut-open view.

The embodiment that provides below in conjunction with accompanying drawing further describes.Referring to Fig. 1, this sensing device includes the support (2) of installing in the on-the-spot feed bin (1) that uses of power plant, the charge degree of depth of the approximate feed bin (1) of the support body length of general support (2), on the support body of support (2), be evenly distributed with elastic cantilever (3) structure, the cantilever number can be set according to the feed bin height, establishes 8 on cantilever in this example.The support body of support (2) and cantilever all are hollow tubular structures, so that the layout power supply or the signal lead of utilization, support can select for use steel to make, if there is requirement for anticorrosion also can select for use white steel to do.The outstanding end of each cantilever on the support (2) all is consolidated with vibration assembly (I) as seen from Figure 1.

The structure of vibration assembly (I) sees also Fig. 2, Fig. 3, it includes thin-walled and leads the housing that shakes (4), leading the housing that shakes (4) in this example is the ellipsoid shape, be fixed on the inner support (5) on the housing (4), the mechanical vibration source that the eccentric wheel (7) that is connected is formed on the last end of inner support (5) is fixed with by motor (6) and output shaft thereof.Said mechanical vibration source also can adopt electromagnet to construct and produce mechanical vibration; Can also adopt the control of semiconductor electronic oscillatory circuit to realize mechanical vibration; Also can adopt ultrasonic generator to realize producing mechanical vibration; Mechanical vibration source realizes producing the function of mechanical vibration in a word.

The vibration-measuring sensor structure of this sensing device is referring to Fig. 2, Fig. 3, and it comprises the response body (8) that is fixed on the inner support (5), and the mass (9) that is connected on the outstanding end of response body (8), has terminal block (10) on the response body (8).Response body (8) is a kind of power one power conversion device, its function is that mechanical vibration that mechanical vibration source is produced are by leading the housing that shakes (4) and inner support (5) conducts to response body (8), the variation that converts the amplitude variations or the vibration frequency change of mechanical vibration to electric signal by response body (8) is transferred to peripheral hardware electrical equipment (11) (Displaying Meter and control circuit) by lead and carries out electric signal and handle.Vibration-measuring sensor also can be selected the product of commercially available prod such as 6 25 SHQ-17 of the Ministry of Aerospace Industry or SHQ-21 model for use.Also can select the vibration-measuring sensor of other structure for use.

Referring to accompanying drawing, this sensing device principle of work is as described below: after being installed in this sensing device on the feed bin, by lead its Displaying Meter and control circuit with electrical equipment (11) is electrically connected that (Displaying Meter and control circuit are because of being the current techique category, and hold within non-the sensing device technical scheme, so this paper is detailed presentations not, control circuit can adopt system controlled by computer), as shown in Figure 1, can regularly patrol and examine the interior material level situation of feed bin (1), in order to reduce the life-span of function and increase device, by patrolling and examining of electronic circuit or each check point of microcomputer timing controlled, process is as follows: at first the vibration assembly that starts bottom makes it vibration work, delay time and measure this amplitude after it vibrates steadily, if the vibration assembly of this point is surrounded by powder, this amplitude should install setting value (so-called resistance shake principle) less than this, provide this point by electronic circuit or microcomputer this moment the signal of material (as lighting and the corresponding pilot lamp that is provided with of this point), if this point is provided with and is surrounded then by granular material that this amplitude should provide the no powder signal of this point by circuit greater than that setting value, after finishing, process closes this some vibration assembly, restart next check point, patrol and examine behind the one-period according to what judge and have or not check point physical location of living between the powder to provide actual material level or provide alerting signal or calculate the reserves of material in the feed bin.When its course of work is electrical power work, under the effect of eccentric wheel, produce mechanical vibration, and, the vibration assembly has certain elasticity on the support cantilever because being cemented in, the effect of in addition leading the housing that shakes reaches the response body place with mechanical vibration, response body is subjected to the vibration force effect to produce STRESS VARIATION, and transfers STRESS VARIATION to change in electric and pass to electrical equipment and carry out electric signal and handle by being connected electrically in lead on the terminal block again.

Claims

1, a kind of vibration-damping type material level detects sensing device, it is characterized in that, has the support that places in the feed bin, bracket supports has at least one vibration assembly, this vibration assembly includes leads the housing that shakes, lead on the inner walls of shaking and be fixed with inner support, be fixed with the vibration source and the vibration-measuring sensor that can produce mechanical vibration on the inner support.

2, detect sensing device according to the described vibration-damping type material level of claim 1, it is characterized in that said vibration-measuring sensor can adopt following structure: have and be fixed on and lead the response body and the outstanding end of response body that shake on the inner support that housing is connected as a single entity and be fixed with mass, has terminal block on the response body, the amplitude variations or the vibration frequency change of the mechanical vibration that vibration source produced by response body convert change in electric to, utilize terminal block that electric signal is transferred to the peripheral hardware electric equipment again.

3, detect sensing device according to the described vibration-damping type material level of claim 1, it is characterized in that said vibration source can adopt to be fixed with the eccentric wheel structure on motor and the motor shaft and to form.

4, detect sensing device according to the described vibration-damping type material level of claim 1, it is characterized in that said vibration source also can adopt the electromagnet structure to realize producing mechanical vibration.

5, detect sensing device according to claim 1 or 4 described vibration-damping type material levels, it is characterized in that said vibration source also can adopt the control of semiconductor electronic oscillatory circuit and realize producing mechanical vibration.

6, detect sensing device according to the described vibration-damping type material level of claim 1, it is characterized in that said vibration source also can adopt ultrasonic generator to realize producing mechanical vibration.