JPS5895110A - Retractable soot blower of long stroke - Google Patents

Abstract

PURPOSE:To remove excessive load from a drive unit, by composing a titled device to house the drive unit and to suspend it from a guide plate, of the primary bracket, having a set of rollers which consists of four rollers, and the secondary bracket which is suspended by a hinge pin. CONSTITUTION:The primary bracket 12 pinches a guide plate 14 by a total of four rollers, that is, the right and the left, two rollers 15 and 16, and the other two rollers 17 and 18, in order to prevent useless swing of a drive unit. The secondary bracket is composed of a box l1a to house the drive unit 11, a member 21a to suspend the box 11a, and hinge 22 which stretches forward from the box 11a, and the end of a hinge 22 is forked into two branches, to each end of which a roller 23 is provided. The rollers 23 prevent the drive unit 11 from rockable movement from side to side in the horizontal direction. With such an arrangement, a retractable soot blower without excessive load imposed on the drive unit can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a long-slot soot blower that removes dirt such as ash, soot, and slag adhering to a heat transfer surface in order to maintain high thermal efficiency of a boiler device.

As shown in Fig. 1, the commonly used long soot blower has a mechanism that rotates a lance tube 1 while moving it forward and backward by a drive motor 3 to inject the injection medium. Those with a length of 3 to 12 m are generally used. In such a conventional long-slot soot floor, as shown in Figure 2, the lance pipe force 1 is deflected by its own weight inside the furnace, and the lance rotates due to the centrifugal force and the injection of the medium. Due to the reaction force, a large load acts on the root of the lance tube 1 supported by the bracket 4, and this becomes a large repetitive load, resulting in an uneven load being applied to the drive device. Particularly in the high-temperature gas passages of boilers such as superheaters, the insertion and removal strokes are also a major problem. It is necessary to reduce the force applied to the drive device at the base of the lance tube due to such a load, so a structure that allows slight swinging is adopted at the rear end of the lance tube where it connects to the drive device. It's coming.

Examples of conventional structures are shown in Figures 3 and 4.
Figure (Japanese Patent Application No. 1982-141140, Japanese Unexamined Patent Publication No. 56-666
There is a schematic diagram of the main parts of No. 16).

The outer box 3a of the drive device 3 connected to the lance tube (outer tube) 1 includes a set of rollers 5 that contact the top surface of a rack 6 for suspending the drive device 3, and a pinion that engages with the rack 6 connected to the frame 8. One set of 7 is attached. FIG. 4 is a λ-A cross section of FIG. 3 showing details of the hanging portion. The rack 6 is attached by bolts 9 or welding to both inner surfaces of a frame 8 made of an inverted U-shaped thick plate. Top surface 6a of rack 6
is in contact with the royala 5 on a flat surface and is used to hang the drive device 3, and serves as a traveling rail for the drive device. The rack 6 is formed by processing a part of the rail of the original plate, has a width close to W, and is positioned downward. Binion 7 meshes with this rack. The lower roller 1o contacts a flat surface forming a part of the lower surface of the rack 6 and has a narrow width WP contact surface. That is, the rack 6 corresponding to the partition plate is held between the rollers 5 and 10, and the lance tube 1 connected to the drive device 3 by the rack 6 and the pinion 7 is inserted and extended into the furnace while rotating, and steam or pressure is supplied from the nozzle 1a. It is a soot blower that blows out gas. As the drive device approaches the tip of the mount, the load due to the weight of the extended lance tube causes the drive device to tilt about the axis of the upper roller 5, and is required to cope with this. However, the permissible range of this swing is limited by the gap between the rollers 5 that sandwich the rack and the outer circumferential surface of the lO, and if this is increased, the vibration of the lance tube shown in Figure 2 will be increased, causing repeated damage to each component of the soot blower. This is undesirable because it causes stress and increases vibration.

Furthermore, when the roller 2 receives a load, the load is also applied to the contact portion between the rack and the pinion, increasing the driving power and making the forward and backward movement of the roller 2 less smooth. Furthermore, roller 1o
However, the contact surface width W of the rack can only be made narrower, and there is a problem in that the surface pressure exerted by the rollers on the flat surface of the rack increases, and excessive force is also applied to the bearings of the rollers 10.

The present invention is intended to solve such problems and aims to propose a structure of a long slide soot blower that does not put strain on the drive device.

In short, this invention consists of a first bracket having four sets of rollers, and a second bracket suspended by a hinge pin that is coaxial with the lower and rear rollers. It is made up of a set of rollers that stabilize the running of the guide plate and facilitate swinging in the vertical plane, while swinging in the left and right horizontal planes holds the rack attached to the arm extending from the second bracket F. It is characterized by a long slide suit with a small lower lower limit.

The apparatus according to the present invention will be explained below with reference to the drawings. 1st
The rear side of the platet 12 (hereinafter, the side of the head 13 in FIG. The drive device 11 is housed in a second bracket (21) mounted on a hinge pin 20 concentric with the axis 19. By adopting this structure, roller 15 and roller 1
6, and since the guide plate 14 is held between the rollers 17 and 18, the first platelet does not run out during running.

The communication 2 bracket is a box 11a that houses the illustrated drive unit 11.
It consists of a member 21a for suspending this and an arm 22 extending forward from the box 11a, and at the tip of the arm 22 it is divided into two parts, as shown in FIG. 6, and each is provided with a roller 23. This roller 23 holds a rank 24 connected to the guide plate 14 by welding or the like, and prevents the drive device 11 from wobbling in the horizontal direction, that is, from side to side. Therefore, the drive device 11 is capable of swinging in the vertical plane including the fine details of the lance tube, as shown by the broken line in FIG.
There is no left-right vibration, and the first bracket 12 is a roller]-
The guide plate 14 is held between a total of 4 sets, 2 sets on the left and right of the set of rollers 5 and 16, and 2 sets of the set of rollers 17 and 1B.
Since it is not suspended by a set of rollers, there is no unnecessary swinging of the head.

The lance tube 1 is rotated by a sprocket 26 driven by a chain connected to a motor 25. The drive device 11 is a combination of a rack 24 and a pinion 28 to drive a lance tube l.
can be displaced in the axial direction (back and forth direction). When the shaft 19 is rotated by a combination of a worm 27a and a worm wheel 27b which are chain-driven by a motor 25, a pinion 28 that engages with the rack 24 rotates.

By carrying out this invention, the instability of the main body being hung and lowered by a set of rollers 5 (Fig. 1) as in the past,
The load when the lance tube is extended is not required to be received by the narrow roller 1o, nor is it limited by the gap between the oscillating reroller 5.10 and the thickness of the flat part of the rack. This limits left and right swing, making it possible to swing only in the vertical plane.

In addition, since the guide plate is held between four sets of rollers, there is little vibration and the machine is stable. These are the first and second brackets.
Roller 23 separated from bracket and held by arm 22
This is an effect achieved by employing a structure in which the rack contacts the side surface of the rack.

[Brief explanation of drawings]

Figure 1 is a side view showing the appearance of a conventional long slide soot blower, Figure 2 is a diagram showing the extension and swing of the lance tube 1, and Figure 3 is a diagram showing a rack and a set of rollers that hold it. A side view of another conventional long slide soot blower, the second figure is a partial view taken along the line A-A in FIG. A side view showing the relationship between the brackets, FIG. 6 shows the roller 23 at the end of the arm 22.
Partial diagram 0% Figure 7 shows how to clamp the rack with
It is also a sectional view taken along the line B in the figure. 1... Lance tube 11... Drive section 12... First
Bracket 14... Guide plate 15, 16, 17, 18
...Roller 19...Axle 20...Hinge bin
21...Second bracket 22...Arm 23...
Roller diagram 1

Claims (1)

[Claims] 1. In a long slide soot blower device that has a trolley bracket that holds a guide plate between roller sets and is moved by a rack and pinion, four sets of rollers that hold a guide plate that is fixed to the main frame are installed. A first platform with
A second bracket is suspended from a hinge pin installed concentrically with the roller shaft below and on the rear side of the guide plate, and a second bracket is provided with a left-right rest prevention roller on the arm extending forward to enable swinging only in a vertical plane. Long slide soot blower 0