JPS6242006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an injection lance fixing device, and particularly to an injection lance in which a water-cooled lance and a refractory lance are connected. Clamping gripping and fixing devices are provided at two locations on the water-cooled lance side, and each of these fixing devices has a special configuration to prevent vibration of the injection lance.

In an injection lance, the refractory lance side is immersed in molten iron, and granular flux is blown in with gas from a nozzle provided on the tip side.The molten iron is stirred by the energy of the blown gas, and this stirring and blowing The lance itself vibrates due to the reaction force. It has been confirmed that the frequency of this external vibrational force changes depending on the flow rate of the blown gas, the immersion depth of the lance, or the shape of the furnace vessel. In addition, the natural frequency of the lance system is formed from the frequency due to the movement of the molten metal and the frequency of the 4Hz external force caused by gas blowing, but the natural frequency does not resonate with the 4Hz, which is a particularly large external force. It has been confirmed from various experiments that this should be the case. However, the fixing devices devised in the past for this purpose were of a two-point support type with short distances in the longitudinal direction only on the upper side of the water-cooled lance, but the support reaction force was extremely large and it was difficult to sufficiently prevent resonance. I couldn't do it. Therefore, we investigated how the fixing device should be configured in order to avoid this resonance and disperse the supporting reaction force of the fixing device. The present invention was arrived at as a result of this study, and is intended to provide a fixing device that generates less resonance. However, the present invention is such that a group of free rollers, which have a rotating screw shaft in the horizontal direction and are provided in upper and lower stages and at least two in the circumferential direction surrounding the lance, are moved synchronously in the opening and closing direction. An upper fixing device configured to clamp the upper side of the water cooling lance, and two arm rods that protrude almost orthogonally to the injection lance and surround and clamp the lower side of the water cooling lance at their tips. The lower fixing device is provided with a fixing auxiliary means for mooring the arm rod in a lance-held state.

The present invention will be explained in detail below based on the drawings, which show an example of a specific implementation of the invention.
The present invention is not limited to these illustrated examples, but can be implemented in the same manner even if a part of the configuration or design is changed in accordance with the spirit described above and below.
Fig. 1 (side view) shows an example of an injection lance, and the injection lance 1 is generally used by lowering while suspended, and the water-cooled lance 2 and the refractory lance 3 are connected to the connecting part 2a. The lower end of the refractory lance 3 is provided with an outlet 3a oriented in a certain direction. When such injection lance 1 is used, vibrations as described above are generated, which may damage the connecting portion 2a or shorten the life of the refractory lance 3. Therefore, as shown in FIG. 2 (side view), the present invention provides an upper fixing device 4 on the upper side of the water-cooled lance 2, and a lower fixing device 5 on the water-cooled lance side near the connection part 2a to fix the water-cooled lance 2. The upper fixing device 4 has two upper and lower parts as shown in Figure 3 (schematic diagram for explaining the structure).
Upper free roller groups 6a, 6b (not shown) and 6c, 6d arranged in stages are supported on movable bearing seats, respectively, and lower free roller groups 7a, 7b are supported.
(not shown) and 7c and 7d are similarly freely supported on movable bearing seats, and the upper and lower bearing seats are configured to move forward and backward toward the center of the water-cooling lance at different times, thereby clamping and releasing the water-cooling lance 2. I'll make it like that. Note that 4a is an abutment plate provided on the circumferential surface of the water-cooled lance 2. On the other hand, since the lower fixing device 5 is located in a high-temperature atmosphere, it is configured as a clamping device that protrudes through a partition wall (not shown), and is provided so as to be movable forward and backward, as shown in FIG. The two arm rods 25, 25, which are respectively pivotally supported on the distal end side of the movable seat 31, are operated as shown by the arrows (Fig. 4) to clamp the water cooling lance 2, and maintain this clamping state for mooring. It is something.

The upper and lower fixing devices will be described below. The upper fixing device 4 is shown in FIG. 5 (top view), FIG. 6 (bottom side side view in FIG. 5), and FIG. 7 (cutting line in FIG. 5).
8 (a sectional view taken in the direction of the arrow in FIG. 6) and FIG. 8 (a sectional view taken in the direction of the arrow shown in FIG. 6). That is, a pedestal 8 is provided at the location where the injection extension 1 is suspended and at the height of the upper fixing device, and side walls 8a, 8b are provided on both sides of the pedestal 8 (front and rear in the drawing).
Formed and attached integrally or separately. Bearings are provided on the side walls 8a and 8b to freely support the screw shafts 15 and 16 in two stages, upper and lower, and the screw shafts 15 and 16 have screws running in different directions from the center to the left and right, as shown in FIG. Grooves are carved at equal pitches, and the spiral grooves of the upper and lower spiral shafts are also formed in different directions as shown in the figure. Furthermore, guide rods 17 and 18 are fixedly installed on the distal end sides of both side walls 8a and 8b in parallel with the free support screw shafts 15 and 16 and at horizontal height positions. On the other hand, a bearing 11a is provided on the pedestal 8 to freely support a drive shaft 11, one end of which is connected to the output shaft of a hydraulic motor 10 attached to a stand frame 9, and the other end connected to a gearbox. Gear 1 protrudes into 12
Fix 3. Also, the side walls 8 of the screw shafts 15 and 16
The gears 1 on the b side project into the gear box 12 and mesh with each other as shown in FIG.
4 and 14a are fixed, and the gear 14 of the upper screw shaft 15 and the gear 13 of the drive shaft 11 are meshed. Therefore, the screw shafts 15 and 16 are driven by the hydraulic motor 10.
can be rotated in different directions.

On the other hand, symmetrically formed bearing seats 19, 19, 20, 20 are attached to the screw shafts 15, 16, respectively.
The bearing seats 19 and 20 each have boss portions 19a and 20a screwed together with a screw shaft on one side, and a sliding boss portion 1 that slides along the guide rods 17 and 18 on the other side.
9b, 20b, respectively, and the free rollers 6a, 6b, 6c, 6d, 7a, 7 are formed between them.
b, 7c, and 7d, respectively. These free rollers are arranged on a horizontal plane perpendicular to the water-cooled lance 2, and the two free rollers arranged in parallel on one support seat move opposite to the water-cooled lance at an angle of 60 degrees to each other. Note that this angle is not limited to 60 degrees and can be changed as appropriate. In the upper fixing device 4 configured in this way, the hydraulic motor 10
By this operation, the screw shafts 15 and 16 are rotated in unison at the same angular velocity, and the upper and lower free roller groups can be moved all at once to clamp the water-cooled lance 2 or to release the clamp.

On the other hand, the lower fixing device 5 is constructed as shown in FIG. 9 (plan view), FIG. 10 (right end front view of FIG. 9), and FIG. 11 (side view). That is, a support stand 21 is fixedly installed substantially horizontally in the lateral direction at approximately the same height as the water-cooled lance joint 2a, and a movable seat 22 is slidably provided on the upper surface of the support stand 21. This movable seat 22 locks the tip of the working piston of the working cylinder 23 attached to the rear side (left side in the figure) of the support base 21 on the back side, and moves the tip side of the working cylinder 23 (to the right side in the figure) to the rear side. is formed by bending the pivot 22a upward, and the pivot 24,
24 are arranged in parallel to pivotally support the arm rods 25, 25. Each of the arm rods 25 has a long distal end from the pivot portion, and a water-cooled lance holding recess 25a is formed at the distal end thereof, and a short arm rod 2 is formed on the rear end side from the pivot portion.
5b, a piston pivot portion is formed at its tip. The piston pivot portion has working pistons 26a, 26 extending from the working cylinder 26 in both directions.
Each pivots on a. FIG. 9 shows a state in which the actuating cylinder 26 moves both pistons 26a to protrude, bringing the distal end clamping recesses 25a of the arm rod 25 close to each other and clamping the water cooling lance.
It is recommended that the end joint surfaces of the clamping recesses 25a be mutually stepped joint surfaces 25c as shown in FIG. 10. Furthermore, abutment seats 29 having abutment surfaces 29a formed thereon are attached to the inner facing surfaces of the short arm 25b of the arm rod 25, with the abutment surfaces facing each other. In addition, in the figure, this contact surface 29a is connected to the movable seat 2.
Although the one provided at an angle of 30 degrees with respect to the moving direction of 2 is shown, it can be selected appropriately. On the other hand, a sliding seat 27 is provided on the upper surface of the movable seat 22, and a wedge piece 28 is slidably provided on the upper surface of the movable seat 22.
form. As shown in the figure, the projecting wall 28a is formed so that its tip side is along the abutment surface 29a of the abutment seat 29, respectively. Further, an operating cylinder 30 is attached to the rear top surface of the movable seat 22, and the tip of the operating piston is connected to the wedge piece 28. FIG. 9 shows a state in which the operating cylinder 30 has pushed out the wedge piece 28, and its tip protruding wall 28a is on the abutting seat 29.
The short arm rod 25 of the arm rod 25 touches the contact surface 29a of
b is shown moored and held while being biased in the opening direction, and the end clamping recess 25 of the arm rod
Reliably maintain the water cooling lance clamping in a. It is recommended that a part of the abutment surface of the inner surface of the clamping recess 25a be formed as a relief surface, as shown in the figure. When opening, please refer to Figure 12 (9).
As shown in the operation diagram in the figure, first actuate the actuating cylinder 30 to retract the wedge piece 28, then actuate the actuating cylinder 26 to draw the tips of the short arm rods 25b together, then the tip side of the arm rod 25 will be They open each other and release the grip on the water cooling lance 2. Next, when the actuating cylinder 23 is operated to move the movable seat 22 backward, the arm rods 25 will also move backward, and the water-cooled lance 2 will move backward.
can move away from. Although not shown, a cooling water circulation path is formed in the arm rod 25 for cooling.

The fixing device of the present invention is designed to sandwich the water-cooled lance of the injection lance at two locations, one on the upper side and one on the lower side, and the upper fixing device also pinches two groups of free rollers arranged around the two stages in close proximity to each other. The lower fixing device is configured so that the clamping arm levers that can move forward and backward are operated to clamp each other, and this clamped state is maintained by a wedge piece, so that the injection lance can be reliably fixed. It can be held fixed and vibration can be reduced. In addition, since all of these devices are operated by hydraulic motors or hydraulic cylinders, they can be easily centrally controlled and operated.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of an injection lance, Fig. 2 is a side view in which the present invention is applied to Fig. 1, Fig. 3 is a schematic sketch of the structure of the upper fixing device, and Fig. 4 is the lower part. FIG. 5 is a plan view showing the structure of the fixing device, FIG. 6 is a side view of the upper fixing device, FIG. 7 is a sectional view taken along the cutting line in FIG. 5 in the direction of the arrow, and FIG. 6 is a sectional view along the cutting line - in the direction of the arrow, FIG. 9 is a plan view of the lower fixing device, FIG. 10 is a right front view of FIG. 9, FIG. 11 is a side view, and FIGS. 12 and 13. The figure is a plan view illustrating the operation of FIG. 9. 1... Injection lance, 2... Water cooling lance, 3... Refractory lance, 4... Upper fixing device, 5...
Lower fixing device, 6... Upper free roller, 7... Lower free roller, 8... Pedestal, 9... Stand frame, 10... Hydraulic motor, 11... Drive shaft, 12... Gear box, 13, 14... Gear, 15, 16...
Screw shaft, 17, 18... Guide rod, 19, 20... Support seat, 21... Support base, 22... Moving seat, 23... Operating cylinder, 24... Pivot, 25... Arm rod, 26... Operating cylinder, 27... Sliding seat. , 28... wedge piece, 29
...Abutting seat, 30...Operating cylinder.

Claims (1)

[Claims] 1. A vibration-preventing fixing device for an injection extension lance in which a refractory lance is connected to the lower part of a water-cooled lance, which has a rotating screw shaft in the horizontal direction, and is provided in two stages, upper and lower, and at least two in the circumferential direction surrounding the lance. An upper fixing device configured to move a group of free rollers synchronously in the opening and closing direction to clamp the upper side of the water-cooled lance; The lower fixing device is comprised of a lower fixing device pivotally supporting two arm rods that surround and clamp the lower side of the device, and the lower fixing device is also provided with a fixing auxiliary means for mooring the arm rods in a lance-held state. An injection lance fixing device characterized by: