CN2589825Y

CN2589825Y - Stroke control mechanism for boiler blower

Info

Publication number: CN2589825Y
Application number: CN 02290532
Authority: CN
Inventors: 陆继东; 陈明; 沈凯
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2002-12-20
Filing date: 2002-12-20
Publication date: 2003-12-03
Anticipated expiration: 2012-12-20

Abstract

The utility model discloses a stroke control mechanism for a boiler soot blower. The stroke control mechanism comprises a front stroke inductance approach switch and a front stroke inductance approach switch which are respectively positioned on a machine frame and at the positions which are corresponding to the front stroke and the back stroke limits of the soot blower. The stroke control mechanism also comprises a front stroke detecting element and a back stroke detecting element which are respectively positioned at two end parts of a roadster and move with the roadster. The utility model has the advantage of convenient installation, and the contact type mechanical transmission of the original stroke control mechanism is changed into noncontact type electromagnetic transmission in order to enhance the reliability of the stroke control mechanism. The utility model can solve the problems that the malfunction of a stroke switch appears in the running process of the soot blower, and a soot gun can not return. Use period is long, the reaction of the electromagnetic transmission is more sensitive, and manpower and material resources are saved and maintained. A guide rail and a guide groove of a detecting element are designed, so that the distance of the inductance approach switch and the detecting element is convenient to adjust.

Description

A kind of range controlling mechanism that is used for boiler sootblower

Affiliated field

The utility model belongs to the boiler sootblower technical field, is specifically related to a kind of range controlling mechanism that is used for boiler sootblower.The trip controlling organization be a kind of based on inductance approach switch, be applicable to the range controlling mechanism of the telescopic steam sootblower of thermal power plant coal-burning boiler.

Background technology

In order to improve boiler operating efficiency, prolong service life of equipment, the coal-burning boiler more than 90% all adopts steam soot-blower regularly to clean inside dust stratification in the boiler operatiopn in the world at present.Yet one of greatest problem that the telescopic steam sootblower of boiler in use faces is exactly that to be used to control the travel switch of ash gun stroke malfunctioning.Tracing it to its cause mainly is that intrinsic defective is gone up in the retractable soot blower range controlling mechanism design of using at present, though domestic and international in recent years many users constantly improve the soot blower range controlling mechanism, does not all obtain positive effect.What existing range controlling mechanism adopted is the mechanical drive mode (see figure 1) of contact, its principle is: when soot blower runs to the extreme position of forward and backward stroke, the collision block (2,3) that utilization is installed on the sport car, move with sport car is stirred travel switch (1,4), the switching value signal that utilizes the travel switch action to produce then changes the direction of current of electric, make it counter-rotating, and then soot blower is return.Steam sootblower is installed on the boiler body, under high temperature, burn into dust stratification serious environmental, work for a long time, add in the soot blower running and have relative motion between the collision block and travel switch, bump repeatedly, fault takes place to cause the travel switch driving lever to sever in the course of time, travel switch is failure to actuate etc.Front travel malfunctioning switch particularly makes long retractable soot blower sport car derail, and can not unload processing, causes ash gun to rest in the stove, and long retractable soot blower ash gun pipe range reaches several meters, and the soot blower gun barrel is in the overheated and flexural deformation of stove internal cause; More seriously, high temperature, the high steam in the ash gun pipe constantly purges heat-transfer surface in the stove, gently then causes the heat-transfer surface excessive wear, and be heavy then blow quick-fried heat-transfer surface, causes great security incident.The boiler sootblower travel switch is malfunctioning, is a great problem that perplexs many power plant safeties, economical operation at present.

Summary of the invention

In order to overcome the inherent shortcoming in the existing Boiler Steam soot blower range controlling mechanism design, the utility model provides a kind of range controlling mechanism that is used for boiler sootblower, it is applicable to the Stroke Control of the telescopic steam sootblower of thermal power plant coal-burning boiler, can fundamentally get rid of original Boiler Steam soot blower range controlling mechanism inherent shortcoming in design, the problem that the travel switch of avoiding steam sootblower to take place frequently is malfunctioning in running.

For realizing above-mentioned utility model purpose, a kind of range controlling mechanism that is used for boiler sootblower, comprise near switch, it is characterized in that: described is inductance approach switch near switch, comprise front travel inductance approach switch and back stroke inductance approach switch, lay respectively on the frame and the forward and backward extreme limit of travel opposite position of soot blower; The trip controlling organization also comprises front travel detecting element and back stroke detection element, lays respectively at sport car two ends, moves with sport car.

The beneficial effects of the utility model are: easy for installation, change the machine driving of original range controlling mechanism contact into contactless electromagnetism transmission, improved the reliability of range controlling mechanism, can solve the problem that the travel switch that occurs in the soot blower running is malfunctioning, ash gun can't be return to a great extent, life cycle is long, electromagnetism transmission reaction is sensitive more, saves and safeguards manpower and material resources.The guide rail of detecting element and guide groove design are convenient to adjust the distance of inductance approach switch and detecting element.

Description of drawings

Fig. 1 is the structural representation of range controlling mechanism in the prior art;

Fig. 2 is a structural representation of the present utility model;

Fig. 3 is the structural representation of a kind of specific embodiment of detecting element among Fig. 2, (a) front view, (b) left view;

Fig. 4 is the structural representation of a kind of specific embodiment of detecting element among Fig. 2.

Among the figure: 1 back travel switch, 2 back stroke collision blocks, 3 front travel collision blocks, 4 front travel switches, 5 inlet ducts, 6 cycloidal-pin wheel decelerators, 7 interior pipe units, 8 reduction boxes, 9 back stroke inductance approach switches, 10 back stroke detection elements, 11 sport cars, 12 front travel detecting elements, 13 outer pipe units, 14 chains, 15 front travel inductance approach switches, 16 chain-wheel mechanisms, 17 bracket systems, 18 furnace wall sealing devices, 19 nozzles, 20 Intaker controllers, 21 guide grooves, 22 guide rails, 23 nuts.

The specific embodiment

As shown in Figure 2, range controlling mechanism of the present utility model, mainly comprise detecting element and inductance approach switch two parts, wherein, detecting element comprises front travel detecting element 12 and back stroke detection element 10, and inductance approach switch comprises front travel inductance approach switch 15 and back stroke inductance approach switch 9.Front travel detecting element 12 and back stroke detection element 10 are installed in two ends of sport car 11, move with sport car; Front travel inductance approach switch 15 and back stroke inductance approach switch 9 are installed in respectively on the frame and the forward and backward extreme limit of travel opposite position of soot blower, for the ease of moving forward and backward inductance approach switch, also have guide groove on the frame.

Inductance approach switch can adopt the commercially available prod.The two type of inductance approach switch and detecting element is complementary, and must be metal material as the detecting element of metal mold inductance approach switch, is generally the metal iron plate; General metal mold proximity transducer and have that to select the detecting element material of metal proximity transducer be aluminium.

Fig. 3,4 has enumerated two kinds of connected modes of front travel detecting element 12 and back stroke detection element 10 (following general designation detecting elements) and sport car 11.Detecting element among Fig. 3 simultaneously is perceived, and another side has two guide grooves 21, is installed on the sport car with screw, and detecting element can move up and down along guide groove 21, can adjust the distance between the sensor in perceived and the inductance approach switch easily.Among Fig. 4, the guide rail 22 that is used for the detection and localization element is fixed on soot blower sport car 11, and detecting element inserts among the guide rail, can slide up and down along guide rail, distance in perceived of convenient adjustment and the inductance approach switch between the sensor, it is fixing to tighten side nut 23 after adjust the position.

Soot blower is in the front travel process, the output of motor drives chain 14 and rotates after cycloidal-pin wheel decelerator 6, reduction box 8 slow down, chain 14 traction sport cars 11 travel forward, drive lower outer pipe device 13 at sport car stretches in the stove while rotating, blow grey steam and spray by nozzle 19 by inlet duct 5, interior pipe unit 7, outer pipe unit 13 successively, the dust stratification on the heating surface is purged.When pipe unit outside the soot blower 13 runs to the front travel extreme position, the front travel detecting element 12 that is installed on the sport car 11 has moved to front travel inductance approach switch 15 tops, front travel inductance approach switch 15 recognizes front travel detecting element 12, produce the counter-rotating of switching value signal drive motor thus, and then outer pipe unit 13 is return under the drive of sport car 11 gradually.Outside in the process that pipe unit 13 is return, still have steam, the dust stratification of heating surface is purged constantly by nozzle 19 ejections.When pipe unit outside the soot blower 13 returns to extreme limit of travel position, back gradually, the back stroke detection element 10 that is installed on the sport car 11 has moved to back stroke inductance approach switch 9 tops, back stroke inductance approach switch 9 recognizes back stroke detection element 10, if only once blow ash, consequent switching value signal controlling inlet duct stops air inlet, motor stops operating, continue to blow ash if desired, motor is reversed once more, outer pipe unit 13 stretches under the drive of sport car in the stove once more, and the dust stratification of heating surface is purged.

Claims

1, a kind of range controlling mechanism that is used for boiler sootblower, comprise near switch, it is characterized in that: described is inductance approach switch near switch, comprise front travel inductance approach switch (15) and back stroke inductance approach switch (9), lay respectively on the frame and the forward and backward extreme limit of travel opposite position of soot blower; The trip controlling organization also comprises front travel detecting element (12) and back stroke detection element (10), lays respectively at sport car (11) two ends, moves with sport car.

2, range controlling mechanism according to claim 1, it is characterized in that: the one side of described front travel detecting element (12) and back stroke detection element (10) is perceived, another side has guide groove (20), and two detecting elements can move up and down and locate on sport car along guide groove (20).

3, range controlling mechanism according to claim 1, it is characterized in that: the guide rail (22) that is used to locate described front travel detecting element (12) and back stroke detection element (10) is fixed on soot blower sport car (11), two detecting elements (12,10) insert in the guide rail (22), can slide up and down and locate along guide rail (22).