CN2589825Y - Stroke control mechanism for boiler blower - Google Patents

Abstract

The utility model discloses a stroke control mechanism for a boiler soot blower. The stroke control mechanism includes a front stroke inductive proximity switch and a rear stroke inductive proximity switch, which are respectively located on the frame corresponding to the front and rear stroke limits of the soot blower; the stroke control mechanism also includes a front stroke detection element and a rear stroke The detection elements are respectively located at the two ends of the sports car and move together with the sports car. The beneficial effects of the utility model are: easy installation, changing the contact-type mechanical transmission of the original stroke control mechanism into a non-contact electromagnetic transmission, improving the reliability of the stroke control mechanism, and solving the problem of the soot blower to a large extent. During the operation, the travel switch fails and the soot blower cannot be returned. The service life is long, and the electromagnetic transmission response is more sensitive, which saves maintenance manpower and material resources. The guide rail and guide groove of the detection element are designed to facilitate the adjustment of the distance between the inductive proximity switch and the detection element.

Description

A Stroke Control Mechanism for Boiler Sootblower

Field

The utility model belongs to the technical field of boiler soot blowers, in particular to a stroke control mechanism for boiler soot blowers. The travel control mechanism is based on an inductive proximity switch and is suitable for a telescopic steam soot blower of a coal-fired boiler in a thermal power plant.

Background technique

In order to improve boiler operating efficiency and prolong the service life of equipment, more than 90% of coal-fired boilers in the world currently use steam soot blowing devices to regularly clean the internal ash deposits during boiler operation. However, one of the biggest problems faced by the boiler telescopic steam sootblower during use is that the limit switch used to control the stroke of the sootblower fails. The main reason is the inherent defect in the design of the stroke control mechanism of the telescopic sootblower currently used. Although many users at home and abroad have continuously improved the stroke control mechanism of the sootblower in recent years, no obvious effect has been achieved. The existing stroke control mechanism adopts a contact mechanical transmission method (see Figure 1). The bumper (2, 3) toggles the travel switch (1, 4), then utilizes the switching signal generated by the travel switch action to change the direction of the motor current, reverse it, and then return the sootblower. The steam soot blower is installed on the boiler body, and it has been working in an environment of high temperature, corrosion, and serious dust accumulation for a long time. In addition, there is relative movement between the collision block and the travel switch during the operation of the soot blower. Faults such as the breakage of the lever and the failure of the travel switch occurred. In particular, the failure of the front travel switch derailed the sports car of the long telescopic sootblower and could not be disassembled for disposal, causing the soot blower to stay in the furnace. The tube is bent and deformed due to overheating in the furnace; what is more serious is that the high-temperature and high-pressure steam in the soot blowing gun tube continuously purges the heat exchange surface in the furnace, which may cause excessive wear on the heat exchange surface in the slightest, and blow the heat exchange surface in severe cases, resulting in major security incident. The failure of the trip switch of the boiler soot blower is a major problem that plagues the safe and economical operation of many power plants.

Contents of the invention

In order to overcome the inherent defects in the design of the existing stroke control mechanism of the boiler steam soot blower, the utility model provides a stroke control mechanism for the boiler soot blower, which is suitable for the telescopic steam blower of coal-fired boilers in thermal power plants. The stroke control of the soot blower can fundamentally eliminate the inherent defects in the design of the original boiler steam soot blower stroke control mechanism, and avoid the frequent failure of the stroke switch during the operation of the steam soot blower.

In order to achieve the purpose of the above utility model, a stroke control mechanism for a boiler soot blower includes a proximity switch, which is characterized in that: the proximity switch is an inductive proximity switch, including a front stroke inductive proximity switch and a rear stroke inductive proximity switch. Proximity switches are respectively located on the frame corresponding to the front and rear stroke limits of the sootblower; the stroke control mechanism also includes a front stroke detection element and a rear stroke detection element, which are respectively located at two ends of the sports car and move together with the sports car.

The beneficial effects of the utility model are: easy installation, changing the contact-type mechanical transmission of the original stroke control mechanism into a non-contact electromagnetic transmission, improving the reliability of the stroke control mechanism, and solving the problem of the soot blower to a large extent. During the operation, the travel switch fails and the soot blower cannot be returned. The service life is long, and the electromagnetic transmission response is more sensitive, which saves maintenance manpower and material resources. The guide rail and guide groove of the detection element are designed to facilitate the adjustment of the distance between the inductive proximity switch and the detection element.

Description of drawings

Fig. 1 is the structural representation of stroke control mechanism in the prior art;

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

Fig. 3 is a schematic structural view of a specific embodiment of the detection element in Fig. 2, (a) front view, (b) left view;

Fig. 4 is a schematic structural diagram of a specific embodiment of the detection element in Fig. 2 .

In the figure: 1 Rear stroke switch, 2 Rear stroke bumper, 3 Front stroke bumper, 4 Front stroke switch, 5 Air intake device, 6 Cycloidal pin wheel reducer, 7 Inner tube device, 8 Reduction box, 9 Rear stroke Inductive proximity switch, 10 rear stroke detection element, 11 sports car, 12 front stroke detection element, 13 outer tube device, 14 chain, 15 front stroke inductive proximity switch, 16 sprocket mechanism, 17 bracket device, 18 furnace wall seal Device, 19 nozzles, 20 intake control devices, 21 guide grooves, 22 guide rails, 23 nuts.

Detailed ways

As shown in Figure 2, the stroke control mechanism of the present utility model mainly includes two parts: a detection element and an inductive proximity switch, wherein the detection element includes a front stroke detection element 12 and a rear stroke detection element 10, and the inductive proximity switch includes a front stroke Inductive proximity switch 15 and rear stroke inductive proximity switch 9. The front stroke detection element 12 and the rear stroke detection element 10 are installed on the two ends of the sports car 11 and move together with the sports car; For the corresponding position of the front and rear travel limits, in order to facilitate the forward and backward movement of the inductive proximity switch, there are also guide slots on the frame.

Inductive proximity switches can use commercially available products. The inductive proximity switch and the detection element match the two types. For example, the detection element of the metal type inductive proximity switch must be a metal material, generally a metal iron sheet; the detection element material of the pan-metal proximity sensor and the selective metal proximity sensor is aluminum.

3 and 4 have enumerated two connection modes of the front stroke detection element 12 and the rear stroke detection element 10 (hereinafter collectively referred to as detection elements) and the sports car 11. One side of the detection element in Figure 3 is the sensed surface, and the other side has two guide grooves 21, which are installed on the sports car with screws. The detection element can move up and down along the guide grooves 21, and can easily adjust the sensed surface and the inductive approach. The distance between the sensors in the switch. In Fig. 4, the guide rail 22 for positioning the detection element is fixed on the sootblower sports car 11, the detection element is inserted into the guide rail, and can slide up and down along the guide rail, so as to facilitate the adjustment of the distance between the sensed surface and the sensor in the inductive proximity switch After the position is adjusted, tighten the side nut 23 to fix it.

During the front stroke of the soot blower, the output of the motor drives the chain 14 to rotate after being decelerated by the cycloidal pinwheel reducer 6 and the reduction box 8, and the chain 14 pulls the sports car 11 to move forward. Driven by the sports car, the outer tube device 13 While rotating, it stretches into the furnace, and the soot-blowing steam passes through the air inlet device 5, the inner pipe device 7, and the outer pipe device 13 in sequence, and is ejected from the nozzle 19 to purge the soot accumulated on the heating surface. When the sootblower outer pipe device 13 runs to the front stroke limit position, the front stroke detection element 12 installed on the sports car 11 moves above the front stroke inductive proximity switch 15, and the front stroke inductive proximity switch 15 recognizes the front stroke detection The component 12 generates a switching signal to drive the motor to reverse, and then the outer tube device 13 is gradually retreated under the drive of the sports car 11 . In the process of returning the outer tube device 13, steam is still continuously ejected from the nozzle 19 to purge the accumulated dust on the heating surface. When the sootblower outer tube device 13 gradually returns to the limit position of the rear stroke, the rear stroke detection element 10 installed on the sports car 11 moves above the rear stroke inductive proximity switch 9, and the rear stroke inductive proximity switch 9 recognizes the rear stroke If the detection element 10 only performs soot blowing once, the resulting switching signal controls the air intake device to stop the air intake, and the motor stops rotating. Driven by it, it extends into the furnace again to purge the ash accumulated on the heating surface.

Claims (3)

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).

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