Sintering cooler wheel drop detector

Abstract

To provide a sinter cooler derailment detection apparatus which is capable of securely detecting the derailment of a trough trolley and is hard to break down even if a derailed wheel collides therewith.SOLUTION: Since, when a wheel 10 of a derailed trough trolley 4 abuts on a blade 20 of a striker 18, the wheel 10 abuts on the blade 20 in a movement direction, namely in a horizontal direction of the trough trolley 4, the striker 18 operates a limit switch (detector) 13 while rotating around a vertical axis of rotation to output a derailment detection signal from the limit switch 13.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a sintering cooler wheel derailment detection device that detects the derailment of a trough car of a sintering cooler. [Background technology]

[0002] In the steel industry, cheap iron ore with a grain size of 5 mm or less, known as fine ore, is agglomerated through a sintering process to produce sintered ore. Producing high-quality sintered ore with high strength and reducibility and using it as blast furnace feedstock ensures good ventilation inside the furnace and reduces the ratio of coke used as a reducing agent, leading to stable operation of the blast furnace, improved productivity, and reduced CO2 emissions. Sintered ore sintered in a sintering machine is in a red-hot state, and if it is charged into a blast furnace as is, problems such as thermal wear of the chute can occur. Therefore, the sintered ore is cooled in a sintering cooler before being charged into the blast furnace. In a sinter cooler, a number of trough carts are mounted in an endless series on a circular rail and are moved on the rail in a linked manner. Sintered ore is charged into the trough on the trough cart from a charging port provided at one point on the rail, and while moving on the rail, the sintered ore is cooled by air blown from below to above the trough, and at the discharge port in front of the charging port, the trough of the trough cart at that position is tilted and the cooled sintered ore on the trough is discharged. If the wheels of the trough carts moving in a linked manner come off, it will cause a major disruption to operation. Therefore, a trough cart wheel-off detection device such as that described in the following Patent Document 1 is needed.

[0003] In a sintering cooler wheel derailment detection device cited as a conventional technique in the following Patent Document 1, a limit switch is disposed at a position facing the wheel of a trough cart moving on a rail, and the detection bar of this limit switch is configured to protrude toward the wheel side. In this sintering cooler wheel derailment detection device, when a wheel comes off the rail, the wheel collides with the detection bar, and the movement of the detection bar activates the limit switch, detecting the wheel derailment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Jpn. Jpn. Published Examination No. 6196-61 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the sinter cooler wheel derailment detection device described in the above Patent Document 1, the detection bar of the limit switch is simply arranged to protrude toward the wheel side, so there is a risk that the detection bar will break if the wheel that has derailed collides with the detection bar. If the detection bar breaks, it will not function as a wheel derailment detection device, that is, it will be broken, so the device needs to be repaired by replacing the detection bar, etc. The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a sintering cooler wheel derailment detection device that can reliably detect wheel derailment of a trough cart and is less likely to break down even if it is hit by a wheel that has derailed. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one embodiment of the present invention provides a sintering cooler wheel derailment detection device that detects when a wheel of a trough cart used in a sintering cooler has derailed from a rail, and is equipped with a striker that has a blade that is positioned at a position where the wheel of the derailed trough cart comes into contact with the striker and is rotatable around a rotation axis that extends in the vertical direction, and a detector that is activated by the striker when the blade comes into contact with the derailed wheel and the striker is rotated around the rotation axis to output a wheel derailment detection signal. Another aspect of the present invention is characterized in that the detector is a limit switch, and the striker is configured to abut against a detection lever of the limit switch and to urge the blade to a position where the wheel of the derailed trough cart abuts by a return spring provided inside the limit switch.

[0007] In a further aspect of the present invention, the blade is formed of a plate member having both vertical sides, and an upper portion of the blade is inclined obliquely toward the direction of movement of the trough cart. A further aspect of the present invention is characterized in that the blade has a contact portion with which the derailed wheel comes into contact, which is inclined diagonally toward the direction of movement of the trough cart relative to a direction perpendicular to the extension direction of the rail. Effect of the Invention

[0008] According to the sintering cooler wheel derailment detection device of the present invention, when a wheel of a derailed trough cart comes into contact with the blade of the striker, the striker rotates around a vertical axis of rotation while activating the detector, and a wheel derailment detection signal is output from the detector, so that the derailment of the trough cart can be reliably detected, and even if the derailed wheel collides with the blade of the striker, the striker can rotate to absorb and mitigate the impact, thereby preventing breakage of the striker and providing a sintering cooler wheel derailment detection device that is less likely to break down. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic plan view showing an embodiment of a sintered cooler to which a wheel derailment detection device of the present invention is applied; [Diagram 2] FIG. 2 is a schematic cross-sectional view of a trough car used in the sintering cooler of FIG. 1. [Diagram 3] FIG. 2 is a three-view diagram of a wheel derailment detection device provided in the sintering cooler of FIG. 1. [Figure 4] 4 is an explanatory diagram of the operation of the wheel runoff detection device of FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of a sinter cooler wheel derailment detection device of the present invention will be described in detail below with reference to the drawings. The embodiment shown below is an example of a device and method for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the material, shape, structure, arrangement, etc. of the components to the embodiment described below. In addition, the drawings are schematic. Therefore, it should be noted that the relationship and ratio between thickness and planar dimensions are different from the actual ones, and the drawings include parts where the relationship and ratio of dimensions are different from each other.

[0011] FIG. 1 is a schematic plan view showing a sintering cooler 2 to which a wheel-off detection device 1 of this embodiment is applied. In this embodiment, two rails 3 are laid in an annular shape and endless in the area of ​​the sintering cooler 2, and a large number of trough carts 4, for example as shown in FIG. 2, are mounted on the rails 3 in an endless series (without gaps). These large number of trough carts 4 are moved, for example, in a counterclockwise direction on the rails 3 in FIG. 1 by a driving source not shown, and the sintered ore 5 is cooled during the movement. That is, the sintering cooler 2 is configured on the annular rails 3. The annular sintering cooler 2 has a charging port 6 for the sintered ore 5 on the right side of the figure, and a discharge port 7 for the cooled sintered ore 5 is provided just before the trough carts move in the direction of their movement.

[0012] The trough cart 4 shown in FIG. 2 has a trough 8 for accommodating sintered ore 5 at the top, and wheels 10 are rotatably provided at both the left and right ends of the figure below the trough cart 4 via wheel shaft insertion parts 9. These wheels 10 are mounted on the rails 3, and the trough cart 4 is moved in the direction of laying the rails 3. In the sinter cooler 2, red-hot sintered ore 5 is charged into the trough 8 of the trough cart 4 from a sintering machine (not shown) at the charging port 6 in FIG. 1. The trough 8 is configured so that wind can blow from below to above the bottom surface 8a, and cooling air is blown from below to above while the upper and lower parts of the trough 8 are closed almost airtight, thereby cooling the sintered ore 5 accommodated in the trough 8. When the trough cart 4 is moved to the discharge port 7, the entire trough cart 4 or only the trough 8 is tilted to discharge the cooled sintered ore 5 inside.

[0013] As shown in Fig. 2, the wheels 10 of the trough cart 4 are provided with flanges 11 for preventing the wheels from coming off the rails 3 on the outer sides thereof. However, the wheels 10 may still come off the rails 3. Therefore, in the sintering cooler 2, the wheel-off detectors 1 are disposed on both sides of the radial outer and inner sides of the two annular rails 3, i.e., on both sides in the laying direction of the rails 3, at the upper part in the plan view of Fig. 1, i.e., at a 1 / 4 rotation position of the annular rails 3 counterclockwise from the charging inlet 6, and at the lower part, i.e., at a 1 / 4 rotation position before the discharge outlet 7 of the annular rails 3. Note that the arrangement of the wheel-off detectors 1 is merely an example, and it is possible to arrange the wheel-off detectors 1 at a predetermined interval with respect to the annular rails 3, as described in the above-mentioned Patent Document 1.

[0014] FIG. 3 is a three-view diagram of the wheel-falling detection device 1 of this embodiment, with FIG. 3a being a front view, FIG. 3b being a left side view, and FIG. 3c being a top view. This wheel-falling detection device 1 is installed on a gate-shaped platform 12 with a rectangular upper surface, and the platform 12 is installed so that the longitudinal direction of the upper surface coincides with the normal direction of the circular annular rail 3. A limit switch 13 is mounted on the rail 3 side of the upper surface of the platform 12 as a detector for detecting wheel-falling. The limit switch 13 has a detection lever 14 provided on the right side of the main body in FIG. 3b. In this example, the detection lever 14 is set upward from the main body, and a roller 15 is attached to its upper end so as to be rotatable around a rotation axis 14a parallel to the rail laying direction. In this limit switch 13, the detection lever 14 can be rotated both clockwise and counterclockwise from the state shown in FIG. 3a around a support axis 16 for rotatably mounting the lower end of the detection lever 14 to the main body. As is well known, this detection lever 14 is biased to a set state, i.e., a normal position, facing upward, by a return spring (not shown) provided inside the body of the limit switch 13. Therefore, even if the detection lever 14 is rotated clockwise or counterclockwise as described above, it is restored to the state shown in Fig. 3a by the biasing force of the return spring. The output of this limit switch 13 is input to a control device of the sintering cooler 2 (not shown), and is configured so that the sintering cooler 2 is stopped when a wheel derailment detection signal (described later) is output. Note that the illustration of the wheel derailment detection signal output wire (electric cable) of the limit switch 13 is omitted.

[0015] A rotating shaft member 17 is provided vertically upward at the end of the top surface of the base 12 on the rail 3 side. This rotating shaft member 17 constitutes the vertical direction of a striker 18 described later, i.e., a rotating shaft extending in the vertical direction. In this embodiment, a cylindrical metal round bar member with a relatively small diameter is used as the rotating shaft member 17, and is provided vertically upward from the end of the top surface of the base 12 on the rail 3 side, opposite the side where the detection lever 14 of the limit switch 13 is located. A striker 18 that operates the detection lever 14 of the limit switch 13 is attached to the rotating shaft member 17 so as to be rotatable about a vertical rotation axis. The striker 18 is formed by joining two bent metal plate members, to which a cap member 19 into which the rotating shaft member 17 fits relatively tightly is joined, and the cap member 19 is placed over the upper part of the rotating shaft member 17 so that the striker 18 is rotatably coupled (engaged) with the rotating shaft member 17. The striker 18 is equipped with a blade 20 against which the wheel 10 of the derailed trough cart 4 comes into contact, and an operating unit 21 that operates the detection lever 14 of the limit switch 13.

[0016] The blade 20 is a member extending from the portion of the cap member 19 fitted onto the rotating shaft member 17 toward the rail 3, and has an attachment portion 22 to which the cap member 19 is attached, an abutment portion 24 against which the wheel 10 of the derailed trough cart 4 abuts, and a connecting portion 23 connecting the attachment portion 22 and the abutment portion 24. The attachment portion 22, the connecting portion 23, and the abutment portion 24 of the blade 20 are formed by bending a series of metal plates, the attachment portion 22 extending in the normal direction of the annular rail 3, the abutment portion 24 extending obliquely from a position further ahead in the movement direction of the trough cart 4 than the attachment portion 22 toward the further ahead in the movement direction of the trough cart 4, and the connecting portion 23 extending so as to connect the attachment portion 22 and the abutment portion 24. The mounting portion 22, the connecting portion 23, and the abutting portion 24 are all arranged so that both lower surfaces are vertical, and the upper portions of each are inclined obliquely toward the front side in the moving direction of the trough cart 4. In addition, in the lower portion of the blade 20, a thin metal square pipe is continuously joined as a reinforcing member 25 toward the extension direction of the blade 20 to the vertical surface on the front side in the moving direction of the trough cart 4. In addition, the planar shape of the blade 20 is not limited to this.

[0017] The operating part 21 is formed by bending a metal plate member with horizontal upper and lower faces that extends from the connecting part 23 of the blade 20 toward the detection lever 14 of the limit switch 13. This operating part 21 is joined to the lower face of the connecting part 23 of the blade 20, and a rib member 26 made of a metal plate member with vertical both faces that extends in the normal direction of the annular rail 3 is joined to the joint so as to straddle both. In addition, the tip 21a in the extension direction of the operating part 21, i.e., the end on the detection lever 14 side of the limit switch 13, is inclined slightly diagonally upward, and the tip 21a abuts against the upper surface of the roller 15 attached to the detection lever 14 of the limit switch 13.

[0018] In Fig. 3a and Fig. 3c, the wheel 10 of the trough cart 4 that has run off is shown by a two-dot chain line. In the wheel-runoff detection device 1 having the above-mentioned configuration, as shown in the figure, when the wheel 10 that has run off is moved together with the trough cart 4, the wheel 10 abuts against the abutment portion 24 of the blade 20. When the wheel 10 that has run off abuts against the blade 20 in this way, the blade 20 rotates together with the operating unit 21 around the vertical rotation axis constituted by the rotating shaft member 17 so that the abutment portion 24 moves away from the rail 3. At this time, the upwardly inclined tip portion 21a of the operating unit 21 abuts against the upper surface of the roller 15 attached to the detection lever 14 of the limit switch 13, so that the upward tip portion 21a pushes the detection lever 14 of the limit switch 13 to the left in Fig. 3a, and accordingly the detection lever 14 is rotated counterclockwise around the support shaft 16, and a contact (not shown) inside the limit switch 13 is abutted, and a wheel-runoff detection signal is output. As described above, when the wheel derailment detection signal is input to the control device of the sintering cooler 2, the sintering cooler 2 is stopped.

[0019] In the normal state shown in Fig. 3, the lower surface of the upwardly inclined tip 21a of the operating part 21 of the striker 18 is in contact with the detection lever 14 of the limit switch 13, and the detection lever 14 is biased by the biasing force of the return spring inside the limit switch 13, so that the abutment part 24 of the blade 20 is biased to approach the rail 3 by this biasing force, and the abutment part 24 of the blade 20 is held in a position where the wheel 10 that has derailed contacts it. By setting it in this position, if the wheel 10 does not derail, that is, if the wheel 10 is moving on the regular track on the rail 3, the wheel 10 will not contact the abutment part 24 of the blade 20. In addition, a stopper 27 made of a metal round bar is erected near the rail 3 to prevent the abutment part 24 of the blade 20 from approaching the rail 3 too closely due to the biasing force of the return spring inside the limit switch 13. However, in cases where it is expected that if the abutment portion 24 of the blade 20 of the striker 18 gets too close to the rail 3, the wheel 10, e.g., the flange 11, moving along the regular trajectory of the rail 3 will press against the abutment portion 24 and be pushed back to the set position shown in Figure 3c, i.e., the normal position, then this stopper 27 is not necessary.

[0020] FIG. 4 is a left side view of the device, similar to FIG. 3b, which shows a schematic diagram of the derailed wheel 10 abutting against the abutment portion 24 of the blade 20. In this embodiment, as described above, the upper portion of the blade 20 including the abutment portion 24 is inclined obliquely toward the moving direction of the trough cart 4. Therefore, even if the wheel 10 collides with the blade 20 from above, the kinetic energy of the collision is dispersed in the moving direction of the trough cart 4, i.e., in the rotating direction of the striker 18, and the striker 18 can be rotated, so that the impact of the collision is absorbed and mitigated, and the breakage of the blade 20 is prevented. The inclination angle of the upper portion of the blade 20 is set to 135° from the horizontal, and the angle range is 125° to 145°.

[0021] Furthermore, in this embodiment, the abutment portion 24 of the blade 20 with which the derailed wheel 10 abuts is inclined obliquely toward the front of the movement direction of the trough cart 4 with respect to the normal direction of the annular rail 3, i.e., the direction perpendicular to the extension direction of the rail 3. If the abutment portion 24 of the blade 20 extends in the direction perpendicular to the extension direction of the rail 3 or is inclined toward the rear of the movement direction of the trough cart 4, the blade 20 may be broken by the impact when the derailed wheel 10 collides in the movement direction of the trough cart 4. In contrast, by inclining the abutment portion 24 of the blade 20 obliquely toward the front of the movement direction of the trough cart 4 with respect to the direction perpendicular to the extension direction of the rail 3, a part of the collision energy when colliding in the movement direction of the trough cart 4 can be dispersed in the rotation direction of the striker 18, thereby absorbing and mitigating the impact caused by the collision, and preventing the blade 20 from being broken. The inclination angle of this contact portion 24 with respect to the rail 3 was set to 45° with respect to the tangent direction of the annular rail 3 at the position where the derailed wheel 10 contacted, and the angle range was set to 30° to 60°.

[0022] In this manner, in the sinter cooler wheel derailment detection device of this embodiment, when the wheel 10 of the derailed trough cart 4 abuts against the blade 20 of the striker 18, the wheel 10 abuts against the blade 20 in the moving direction of the trough cart 4, i.e., in the horizontal direction, so that the striker 18 operates the limit switch (detector) 13 while rotating about a vertical rotation axis, and a wheel derailment detection signal is output from the limit switch 13. Therefore, the wheel derailment of the trough cart 4 can be reliably detected, and even if the derailed wheel 10 collides with the blade 20 of the striker 18, the striker 18 rotates to absorb and mitigate the impact, and as a result, the striker 18 is prevented from being broken, and therefore a sinter cooler wheel derailment detection device that is less likely to break is provided.

[0023] In addition, the striker 18 is configured to abut against the detection lever 14 of the limit switch 13 and is urged by a return spring provided inside the limit switch 13 to a position where the blade 20 abuts against the wheel 10 of the trough cart 4 that has derailed. This eliminates the need for a mechanism to restore and hold the striker 18 in a position where it abuts against the derailed wheel 10, making it possible to simplify the configuration and reduce costs. Furthermore, by constructing the blade 20 from a plate member having both vertical sides and tilting its upper part diagonally toward the direction of movement of the trough cart 4, even if the wheel 10 collides with the blade 20 from above, the kinetic energy of the collision can be dispersed in the rotational direction of the striker 18, causing the striker 18 to rotate. As a result, the impact of the collision is absorbed and mitigated, and breakage of the blade 20 is prevented.

[0024] In addition, by inclining the abutment portion 24 of the blade 20 with which the derailed wheel 10 comes into contact diagonally toward the direction of movement of the trough cart 4 relative to a direction perpendicular to the extension direction of the rail 3, part of the collision energy when the wheel 10 collides with the abutment portion 24 in the direction of movement of the trough cart 4 can be dispersed in the rotational direction of the striker 18, thereby absorbing and mitigating the impact associated with the collision and preventing breakage of the blade 20. The sintering cooler wheel derailment detection device according to the embodiment has been described above, but the present invention is not limited to the configuration described in the above embodiment, and various modifications are possible within the scope of the gist of the present invention. For example, in the above embodiment, the limit switch 13 is used as a detector that outputs a wheel derailment detection signal, but instead of the limit switch, for example, a photoelectric switch can be used. However, as described above, by using the biasing force of the return spring of the limit switch 13 as the restoring force of the striker 18, there is an advantage in that the configuration can be simplified and the cost can be reduced. [Explanation of symbols]

[0025] 1. Wheel derailment detection device 2 Sintering Cooler 3. Rail 4 Trough Cart 10 wheels 13 Limit switch (detector) 14 Detection lever 17 Rotating shaft components (rotating shafts) 18 Striker 20 Blades 24 Contact part

Claims

1. A sinter cooler wheel derailment detection device detects whether the wheels of a trough cart used in a sinter cooler have derailed from a rail. A striker having a blade arranged at a position where the wheel of the derailed trough cart comes into contact and rotatable around a rotation axis extending in a vertical direction; a detector that is activated by the striker when the blade comes into contact with the derailed wheel and the striker is rotated about a rotation axis to output a derailment detection signal; The sintering cooler wheel derailment detection device is characterized in that the detector is a limit switch, and the striker is configured to abut against the detection lever of the limit switch and to urge the blade to a position where the wheel of the derailed trough cart abuts by a return spring provided inside the limit switch.

2. The sintering cooler wheel derailment detection device according to claim 1, characterized in that the blade is composed of a plate member having both vertical faces and an upper portion thereof is inclined obliquely toward the forward direction of movement of the trough cart.

3. The sintering cooler wheel derailment detection device according to claim 1 or 2, characterized in that the blade has a contact portion with which the derailed wheel comes into contact, which is inclined diagonally toward the direction of movement of the trough cart relative to a direction perpendicular to the extension direction of the rail.

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