JPH0721754U - Tuyere changer - Google Patents

Abstract

(57) [Summary] [Purpose] The eccentric impact of the air hammer due to the eccentricity of the air hammer and hydraulic cylinder is eliminated, the reaction force of pulling is not applied to the dolly as much as possible, and the impact due to the impact of the air hammer is transmitted to the dolly. Alleviate. [Structure] A hydraulic cylinder 3 and an air hammer 5 that strikes in a pulling direction are arranged in series on a frame 2 mounted on a self-propelled carriage 1, and a reaction force at the time of pulling out and pushing into the frame 2 is a truck. A tuyere changer for both push-in and pull-out, which is equipped with a reaction force receiver that does not hang on each side, and also has shock mitigation measures at the joint part of the frame and trolley.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blast furnace tuyere replacement machine.

[0002]

[Prior art]

 Since the tuyere replacement work of a blast furnace is a work performed in high temperature and dust, various tuyere replacement machines have been devised. As an example, there is a device disclosed in Japanese Utility Model Laid-Open No. 61-183946, in which a push-pull output hydraulic cylinder is mounted on a forklift, and a one-way impact air hammer is pushed in and pulled out from the hydraulic cylinder. Each is equipped with a single unit, and the reaction force of pushing and pulling is pin connection between the furnace body and the frame.

In this invention, since the axial center of the push-pull output hydraulic cylinder, which is the main output, and the axial center of the air hammer do not match, a rotational moment is generated by hammer impact, and the rigidity and wear resistance of the hammer sliding guide are generated. Is required, and the frame is unnecessarily large.

Regarding the position of the reaction force receiver, a rotational moment is generated due to the level difference between the pin position of the frame and the shaft of the push-pull output hydraulic cylinder, and a large force is applied to the truck as a push-pull reaction force. Therefore, the trolley must be enlarged. Furthermore, hammer-based tuyere changers generally tend to make the dolly a little larger in order to deal with hammer impacts or their recoil. The miniaturization is desired because it is used in.

[0005]

[Problems to be solved by the device]

 In the present invention, the eccentric impact of the air hammer due to the eccentricity of the air hammer and the push-pull output hydraulic cylinder is eliminated, and the structure is such that the reaction force of pushing / pulling out is not applied to the carriage as much as possible and the shaft using the air hammer is used. The purpose is to reduce the size of the trolley by improving the directional impact to the trolley and improve workability on the narrow hearth.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention employs the following means. That is, the means 1 arranges a push-pull output hydraulic cylinder and an air hammer hitting in the pull-out direction in series on the same frame (hereinafter referred to as the output shaft) on a frame mounted on a self-propelled carriage. A tuyere pulling metal fitting or tuyere pushing metal fitting can be detachably attached to the front end of the rod on the front side of the hydraulic cylinder.Furthermore, a holding tool that does not apply the reaction force at the time of pulling and pushing to the frame to the frame The pull-out reaction force receiver and the push-in reaction force receiver, which are composed of hooks, are provided. Further, the means 2 is a tuyere changer for both pushing and pulling, in which a buffer is inserted in the connecting portion between the frame and the carriage.

The present invention will be described in more detail below. In the present invention, in order to eliminate the eccentricity of the air hammer and the hydraulic cylinder for push-pull output, the air hammer and the hydraulic cylinder are arranged coaxially, and the air hammer acts on the pulling side. Conventionally, the pushing force of the tuyere requires the force to bring the tuyere into close contact with the tuyere mounting surface against the deformation of the tuyere mounting opening due to heat, etc. The normal pulling force may be smaller than the pushing force because the gradient is self-supporting, but since there is welding of hot metal, slag, etc., biting, etc., the pushing force and pulling force are equivalent. Therefore, it has been considered that the impact direction of the air hammer should be combined with the working direction to apply the hammer force to the force of the hydraulic cylinder. However, as a result of various confirmation tests, it was found that the pulling force needs to be larger than the pushing force.

[0008] Accordingly, if the maximum output value is made to correspond to the pulling force, it is possible to reversely strike the hammer at the time of pushing. Reversing the air hammer does not mean that the total output is the hydraulic cylinder output minus the air hammer output. The hammer strike acts as an instantaneous force, that is, a hammering force, and since the hydraulic cylinder force acts during the time when there is no hammer strike, the output of the hydraulic cylinder is secured as the pushing force. In addition, the hammer force has a favorable effect on indentation as vibration, as seen in a vibrating pile driver. Needless to say, the output of the air hammer is added to the output of the hydraulic cylinder as a striking force when pulling out. In this way, by installing the hammer in the punching direction, one hammer can be used for both pushing and pulling.

Next, regarding the structure in which the push-in / pull-out reaction force is not applied to the carriage as much as possible, the frame is pulled toward or separated from the tuyere side, that is, the furnace body side, as a push-in / pull-out reaction force receiver. The method of connecting the force to the furnace body by means of protrusions and pins is generally used, but depending on the position, a rotational moment is generated and a large force is applied to the bogie, so the reaction force receiver is pushed and output. By arranging the hydraulic cylinder at the same height as the rod of the hydraulic cylinder, the rotational moment can be reduced and the load on the truck can be reduced.

At the time of pushing work, it is necessary to change the tilt angle of the output shaft and push it again to correct the tuyere insertion angle, which is a slight 1 to 2 °. A forklift truck is used as a cart. Since there is no upward force distribution, the connection point between the indentation reaction force receiver and the furnace side hardware must be located at a position where it will not go above the output shaft during the maximum tilting work of the output shaft. The position of the metal fittings on the furnace side should be below the center height of the tuyere mounting holes. It goes without saying that the output shaft must be capable of tilting in the vertical direction. On the other hand, at the time of drawing work, the output shaft may be tilted and pulled with respect to the firmly fixed tuyere, but since the pulling reaction force receiver only needs to push the furnace wall, it can be integrated with the frame. The pull-out reaction force receiver may have the same height as the output shaft. By considering the position of the reaction force transmission point as described above, it is possible to prevent the generation of a moment, and it is possible to suppress the influence of the reaction force on the dolly as much as possible, and to reduce the size of the dolly to the tuyere changer. It is possible to prevent the tip from falling due to the weight of the tuyere at the time of distraction, shorten the tuyere changer, and reduce the size to the minimum required capacity in terms of running stability with the tuyere on.

By reducing the size of the bogie, the impact of the hammer impact on the electric equipment of the bogie can be mentioned. If the hammer hitting force is the same, the smaller the truck is, the smaller the inertial force of the truck is, and the greater the influence of the impact force is.

The impact of the hammer acts in the direction of the output shaft, and shock absorption can be mitigated by coupling the frame and the dolly through a cushioning body such as rubber or a spring. Inserting the shock absorber at this position is a method that can be applied because it is not necessary to hold the position of forward and backward movement when using a hammer, and the shock absorber has a shock absorbing effect in both forward and reverse directions with respect to the output shaft, and It goes without saying that it is necessary to have the strength to withstand the output of the front-rear movement cylinder. Since the impact can be alleviated by the above method, the electric equipment of the truck is protected and the truck can be downsized.

[0013]

[Action]

 In the present invention, when the tuyere is damaged and needs to be replaced, the self-propelled carriage is driven to a predetermined position with the tuyere pulling metal fitting attached to the front rod tip of the push-pull output hydraulic cylinder. After advancing, the self-propelled bogie's vertical movement, left-right movement, and forward / backward tilting functions are used to align the tuyere withdrawal metal fittings with the tuyere mounting holes, and the bogie's forward / backward hydraulic cylinder receives pulling reaction force Move forward until it hits the furnace body. Then, operate the hydraulic cylinder for push-pull output to insert the pull-out metal fitting into the tuyere, hook the hook-shaped part of the pull-out metal fitting on the tip of the tuyere, and pull it with the hydraulic cylinder for push-pull output at the same time. Activate the air hammer. When the tuyere is completely removed from the mounting hole, stop the air hammer and pull it out with the push-pull output hydraulic cylinder.

During this work, if the tuyere is firmly fixed to the tuyere mounting hole, the pulling force is alleviated and the output shaft core is tilted in the vertical direction to perform pulling work again. is there. After pulling out the tuyere, the front and rear hydraulic cylinders of the bogie are retracted, and the self-propelled bogie is driven to lower the tuyere to the predetermined position to complete the pulling work.

Next, in order to perform the tuyere pushing work, the tip fitting is used as the tuyere pushing fitting, and the bogie is driven to a predetermined position in front of the tuyere mounting hole with the newly inserted tuyere attached, After centering, move forward and backward by the hydraulic cylinder of the trolley to a predetermined position, connect the push-in reaction force receiver and the metal on the furnace body side, and then slightly retract it to hold the push-in reaction force receiver in a tensioned state. To do. Align the tuyere with the tuyere mounting hole, move the hydraulic cylinder for push-pull output forward, push the tuyere into the tuyere mounting hole, and then operate the air hammer.

During this work, if it cannot be completely pushed in only by horizontal pushing due to thermal deformation of the tuyere mounting holes, tilt the output shaft up and down and push it again, then push it further horizontally. May ensure the correct posture of the tuyere. When the tuyere is completely inserted, stop the air hammer, retract the hydraulic cylinder for output, remove the reaction force receiver, retract the longitudinal hydraulic cylinder of the truck, and then retract the truck to the specified position and push it in. End.

[0017]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a forklift having functions such as lift, tilt, reach, and side shift as well as traveling is used as the self-propelled carriage 1. Fig. 1 shows the tuyere extraction work. The frame 2 mounted on the self-propelled carriage 1 is provided with a hydraulic cylinder 3 for pushing and pulling output of both rods on the upper part, and the front part of the hydraulic cylinder 3 is installed. A tuyere pull-out fitting 4 is detachably attached to the vehicle, and an air hammer 5 that strikes in the pull-out direction is attached to the rear of the tuyere. In addition, the self-propelled carriage 1 moves back and forth to move the frame 2 back and forth. The hydraulic cylinder 6 is incorporated. On both sides of the frame 2, there are respectively a push-in reaction force receiver 7 and a pull-out reaction force receiver 8 for allowing the furnace body to have a push-pull reaction force at the same height as the hydraulic cylinder 3. In the figure, 9 indicates a tuyere.

Although the tuyere withdrawing metal fitting 4 in the figure shows an example in which the tip thereof is a hook type, the hook portion at the tip and the hooking surface of the tuyere 9 are connected to the hydraulic cylinder 3 of the withdrawing metal fitting 4. It is desirable that it coincides with the axis of the mounting shaft, and the fitting 4 and the tip of the rod 3a of the hydraulic cylinder 3 are mounted by the known machine such as a pin or a cotter p because the machine of the present invention is a combined machine. The mechanism is easy to replace.

2 and 3 are a front view and a plan view, respectively, showing a pressed state, and a tuyere pressing metal fitting 10 is detachably attached to the tip of the hydraulic cylinder 3. In the figure, the metal fitting 11 provided on the furnace wall BF is located at a position where the upper limit is the same height as the center of the tuyere mounting hole, and the push-in reaction force receiver 7 provided on the side surface of the frame 2 is attached so as to be vertically movable. Used.

FIG. 4 shows a state in which a synthetic rubber 12 and a spring 13 as a shock absorber are inserted into the joint between the frame 2 and the self-propelled carriage 1 as a countermeasure against impact. A large cushioning effect was obtained by arranging the cushioning bodies 12 and 13 so as to be effective in both the forward and reverse directions with respect to the output shaft and selecting the compressive strength corresponding to the forward and backward moving cylinder output.

When a commercially available forklift is used as the self-propelled carriage, a battery-powered forklift is often used, and as the size of the forklift is reduced, the battery capacity becomes smaller and the workable time becomes shorter. Although it may occur, it is possible to compensate for the battery capacity shortage by reducing the load factor of each motor, such as hydraulic pressure control of the forklift, hydraulic motor drive only when hydraulic pressure is used by a pressure switch, maximum travel speed regulation, etc. The same working time as the conventional large forklift truck was secured.

[0022]

[Effect of device]

 As described above, according to the present invention, since one air hammer is connected to the hydraulic cylinder in the tuyere pulling direction, the strength of the replacement machine against eccentric strike is higher than the two air hammer installation method. Since the rigidity is reduced, the size and weight are reduced, the work space on the side of the replacement machine is expanded, and the workability on the side is improved.

Further, by improving the position of the reaction force receiving member, the reaction force of pushing and pulling applied to the truck is reduced, so that the truck is also downsized. Furthermore, since the turning radius of the bogie becomes smaller due to the miniaturization of the bogie, the operability around the narrow tuyere is improved. In addition to the fact that only one air hammer is required and the dolly becomes smaller due to the smaller size of the dolly, there is also the economic effect that about one unit can be used as a dual-purpose machine as compared to the single-purpose machines for pulling and pushing. Further, by absorbing the impact force of the air hammer, the electric equipment on the carriage can be stably maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a front view showing a tuyere extraction work state according to an embodiment of the present invention.

FIG. 2 is a front view showing a tuyere pushing operation state according to the embodiment of the present invention.

FIG. 3 is a plan view showing a tuyere pushing operation state according to the embodiment of the present invention.

FIG. 4 is an explanatory view showing a state in which a shock absorber is inserted into a joint portion between the frame and the self-propelled carriage of the embodiment of the present invention.

[Explanation of symbols]

 1 Self-propelled trolley 2 Frame 3 Hydraulic cylinder 4 Tuyere withdrawing metal fitting 5 Air hammer 6 Front-rear hydraulic cylinder 7 Pushing reaction force receiver 8 Pulling reaction force receiving 10 Tuyere pushing metal fitting 11 Hardware provided on furnace wall 12 Buffer body 13 buffer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Shimohata, Hiroshi Shimohata, No. 1 Nishinosu, Oita-shi, Nippon Steel Co., Ltd. Oita Works, Oita Works, Equipment Maintenance Area, Maintenance Office (72) Seiji Tokunaga, 1-4 Yaesu, Chuo-ku, Tokyo -4 Inside Daikai Co., Ltd. (72) Inventor Takashi Watanabe 1-4-4 Yaesu, Chuo-ku, Tokyo Inside Daikai Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A hydraulic cylinder and an air hammer for striking in a pulling direction are arranged in series on the same axial core on a frame mounted on a self-propelled truck, and a tuyere is pulled out at a front end of the hydraulic cylinder. A metal fitting or a tuyere pushing metal fitting can be detachably mounted, and a pulling reaction force receiver composed of a holder that does not apply a reaction force at the time of pulling out and pushing to the trolley to approximately the same level as the shaft core of the frame. A tuyere changer characterized by being provided with push-in reaction force receivers each of which is a hook. 2. The tuyere changer according to claim 1, wherein a cushioning member is inserted into a connecting portion between the frame and the carriage.