GB1559801A - Apparatus for removing linings and/or slag from furnaces and the like - Google Patents

Description

(54) APPARATUS FOR REMOVING LININGS AND/OR SLAG FROM FURNACES AND THE LIKE (71) We, HARVEY PLANT HOLDINGS LIMITED, a British company, of Denbury Road, Newton Abbot, Devonshire, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- In the complete specification of our U.K.

Patent Specification No. 1 387 562 there is described and claimed an apparatus for removing linings and/or slag from furnaces and the like.

We have found that there are some jobs for which the apparatus described in Specification No. 1 387562 is unsuitable and a modified version of the apparatus has therefore been developed.

According to the present invention there is provided apparatus for removing linings and/or slag from furnaces and from vessels, ladles and the like used in conjunction with furnaces comprising a tracked vehicle, a pair of spaced apart booms one end of each of which is connecteed to a mounting nonrotatably secured to the vehicle for pivotal movement of the booms in respective vertical planes under the action of respective first power-actuated mechanisms, a telescopic jib mounted between the booms and carried thereby for pivotal movement with respect thereto under the action of a second power-actuated mechanism, and a poweractuated tool mounted on the free end of the reciprocable part of the jib for pivotal movement with respect to the jib under the action of a third power-actuated mechanism.

An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is a diagrammatic side elevation of a furnace delining apparatus, and Fig. 2 shows a detail, partly sectioned, of the telepscopic jib of the apparatus shown in Fig. 1, Fig. 3 is a section through the top of the jib of Fig. 2, and Fig. 4 is a side elevation of part of an alternative form of the invention.

The apparatus shown in Figs. 1 to 3 of the drawings comprises a vehicle 11 having crawler tracks 12. Mounted on the vehicle 11 on either side thereof and to the rear of the centre is a pair of upstanding hollow mountings 13 to each of which is connected one end of a respective one of a pair of booms 14 arranged for pivotal movement in a vertical plane. The booms 14 are raised and lowered by means of a first poweractuated mechanism constituted by a pair of hydraulic rams 15, the upper end of the piston rod 16 of each ram 15 being pivotally connected to a mounting point 17 on the underside of the associated boom 14 and the lower end of the cylinder 18 of each ram 15 being pivotally connected to a point on the associated mounting 13 below and to the rear of the point of pivotal connection of the boom 14.

At their free ends, the booms 14 support between them a telescopic jib 19 comprising a non-reciprocable part or sleeve 21 of rectangular cross-section and a telescoping part 22 mounted for reciprocating movement within the sleeve in a manner described in more detail below. The sleeve 21 of the jib 19 has a pair of mounting plates 23 rigidly secured on the two sides of the sleeve 21 at a position just forward of the centre of the sleeve 21 and extending downwardly from the sleeve 21. The mounting plates 23 are each pivotally connected to a respective one of the booms 14 at the free end thereof to allow pivotal movement of the jib 19 in a vertical plane.Pivotal movement of the jib 19 is caused by a second power-actuated mechanism constituted by a pair of hydraulic rams 24, each of which has the lower end of its cylinder 25 pivotally connected to a point on the associated mounting 13 above the pivot point for the associated boom 14 and the free end of its piston rod 26 pivotally connected to a midpoint on an associated link arm 27. The link arm 27 is pivotally connected at one of its ends to the associated boom 14 and is pivoted at its other end to one end of an associated arm 28, the other end of which is pivotally connected to an associated mounting point 29 provided on one of a pair of second mounting plates 31 rigidly secured to the sleeve 21 of the jib on the slides thereof and at the same longitudinal position as the mounting plates 23. It will be seen from the drawings that the mounting points 29 are above the jib 19.

The telescoping part 22 of the jib 19 pivotally supports at its outer end, a crade 30 on which an impact hammer (not shown) is carried. A third power-actuated mechanism constituted by a hydraulic ram 32 is provided for raising and lowering the cradle 30. The cradle 30 is pivoted at 33 to a projecting nose 34 on the forward end of the telescoping part 22 and the piston rod 35 of the ram 32 is pivoted to the cradle 30 at 36 above the pivot axis 33. The cylinder (not shown) of the ram 32 is mounted in and carried by the telescoping part 22 of the jib.

Reciprocating movement of the telescoping part 22 of the jib is powered by a fourth power-actuated mechanism, a double-acting hydraulic ram 38, which is housed within the jib and has its cylinder 39 connected to the sleeve 21 and its piston rod (not shown) connected to the telescoping part 22.

Hydraulic power to operate the rams 15, 24, 32 and 38 and the hammer is supplied by a hydraulic system of the vehicle 11.

This system and the controls therefor may be of conventional design and will not be further described in this specification.

The jib parts 21 and 22 are both of rectangular cross-section, the inner telescoping part 22 having pairs of longitudinally extending rails 41 and 42 welded respectively to its upper and lower surfaces. The outer sleeve 21 has pairs of upper and lower flanged guide rollers 43 and 44, the axes of which are outside the sleeve 21. The rollers 43 and 44 extend through openings in the sleeve 21 to engage the rails 41 and 42, thus guiding and locating the telescoping part 22 of the jib during its reciprocal movement.The flanges of the rollers are located on their inner sides and are arranged to take side thrust It will be noted from the drawings, that the spacing of the pairs of guide rollers is such that at the forward end of the sleeve 21 there is a closely spaced pair of upper guide rollers 43 and a closely spaced pair of lower guide rollers 44, the latter being nearer to the free end of the sleeve 21 than the former. This arrangement provides effective support of the jib when in its fully extended condition.

A modified form of the invention is shown in Figure 4. The furnace delining apparatus shown in Figure 4 is similar in many respects to that previously described: only the points of difference will therefore be described. As seen from Figure 1, the differences are in the way in which the jib 19 is connected to the booms 14. In the modified form, the sleeve 21 is provided on its underside with a rigidly secured mounting bracket 51 depending therefrom and having a series of pairs of holes 52 spaced along it. The holes 52 permit the pivotal connection to the bracket 51 of the outer end of the booms 14 and of the free end of the arm 28. The provision of a series of pair of holes 52 enables the sleeve 21 to be mounted in several different positions relative to the vehicle 11, giving greater flexibility in the use of the apparatus.

It will be appreciated that by operation of the hydraulic controls of the vehicle the relative disposition of the booms 14, jib 19 and hammer may be varied and that by suitable operation of the rams 15 and 24 the vertical distance of the hammer above the base on which the vehicle stands may be varied over a wide range of values with the jib 19, cradle 30 and hammer maintained horizontal and in alignment.

WHAT WE CLAIM IS: 1. Apparatus for removing linings and/ or slag from furnaces and from vessels, ladles and the like used in conjunction with furnaces comprising a tracked vehicle, a pair of spaced apart booms one end of each of which is connected to a mounting nonrotatably secured to the vehicle for pivotal movement of the booms in respective vertical planes under the action of respective first power-actuated mechanisms, a telescopic jib mounted between the booms and carried thereby for pivotal movement with respect thereto under the action of a second power-actuated mechanism, and a poweractuated tool mounted on the free end of the reciprocable part of the jib for pivotal movement with respect to the jib under the action of a third power-actuated mechanism.

2. Apparatus according to Claim 1 wherein the booms may be selectively connected to different parts of the jib whereby the position of the jib relative to the vehicle may be varied.

3. Apparatus substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. connected to a point on the associated mounting 13 above the pivot point for the associated boom 14 and the free end of its piston rod 26 pivotally connected to a midpoint on an associated link arm 27. The link arm 27 is pivotally connected at one of its ends to the associated boom 14 and is pivoted at its other end to one end of an associated arm 28, the other end of which is pivotally connected to an associated mounting point 29 provided on one of a pair of second mounting plates 31 rigidly secured to the sleeve 21 of the jib on the slides thereof and at the same longitudinal position as the mounting plates 23. It will be seen from the drawings that the mounting points 29 are above the jib 19. The telescoping part 22 of the jib 19 pivotally supports at its outer end, a crade 30 on which an impact hammer (not shown) is carried. A third power-actuated mechanism constituted by a hydraulic ram 32 is provided for raising and lowering the cradle 30. The cradle 30 is pivoted at 33 to a projecting nose 34 on the forward end of the telescoping part 22 and the piston rod 35 of the ram 32 is pivoted to the cradle 30 at 36 above the pivot axis 33. The cylinder (not shown) of the ram 32 is mounted in and carried by the telescoping part 22 of the jib. Reciprocating movement of the telescoping part 22 of the jib is powered by a fourth power-actuated mechanism, a double-acting hydraulic ram 38, which is housed within the jib and has its cylinder 39 connected to the sleeve 21 and its piston rod (not shown) connected to the telescoping part 22. Hydraulic power to operate the rams 15, 24, 32 and 38 and the hammer is supplied by a hydraulic system of the vehicle 11. This system and the controls therefor may be of conventional design and will not be further described in this specification. The jib parts 21 and 22 are both of rectangular cross-section, the inner telescoping part 22 having pairs of longitudinally extending rails 41 and 42 welded respectively to its upper and lower surfaces. The outer sleeve 21 has pairs of upper and lower flanged guide rollers 43 and 44, the axes of which are outside the sleeve 21. The rollers 43 and 44 extend through openings in the sleeve 21 to engage the rails 41 and 42, thus guiding and locating the telescoping part 22 of the jib during its reciprocal movement.The flanges of the rollers are located on their inner sides and are arranged to take side thrust It will be noted from the drawings, that the spacing of the pairs of guide rollers is such that at the forward end of the sleeve 21 there is a closely spaced pair of upper guide rollers 43 and a closely spaced pair of lower guide rollers 44, the latter being nearer to the free end of the sleeve 21 than the former. This arrangement provides effective support of the jib when in its fully extended condition. A modified form of the invention is shown in Figure 4. The furnace delining apparatus shown in Figure 4 is similar in many respects to that previously described: only the points of difference will therefore be described. As seen from Figure 1, the differences are in the way in which the jib 19 is connected to the booms 14. In the modified form, the sleeve 21 is provided on its underside with a rigidly secured mounting bracket 51 depending therefrom and having a series of pairs of holes 52 spaced along it. The holes 52 permit the pivotal connection to the bracket 51 of the outer end of the booms 14 and of the free end of the arm 28. The provision of a series of pair of holes 52 enables the sleeve 21 to be mounted in several different positions relative to the vehicle 11, giving greater flexibility in the use of the apparatus. It will be appreciated that by operation of the hydraulic controls of the vehicle the relative disposition of the booms 14, jib 19 and hammer may be varied and that by suitable operation of the rams 15 and 24 the vertical distance of the hammer above the base on which the vehicle stands may be varied over a wide range of values with the jib 19, cradle 30 and hammer maintained horizontal and in alignment. WHAT WE CLAIM IS:

1. Apparatus for removing linings and/ or slag from furnaces and from vessels, ladles and the like used in conjunction with furnaces comprising a tracked vehicle, a pair of spaced apart booms one end of each of which is connected to a mounting nonrotatably secured to the vehicle for pivotal movement of the booms in respective vertical planes under the action of respective first power-actuated mechanisms, a telescopic jib mounted between the booms and carried thereby for pivotal movement with respect thereto under the action of a second power-actuated mechanism, and a poweractuated tool mounted on the free end of the reciprocable part of the jib for pivotal movement with respect to the jib under the action of a third power-actuated mechanism.

2. Apparatus according to Claim 1 wherein the booms may be selectively connected to different parts of the jib whereby the position of the jib relative to the vehicle may be varied.

3. Apparatus substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.