Cleaning device and method for cleaning the top surface of a coke oven.

Abstract

To provide a cleaning device capable of gathering deposits present on a road surface while minimizing deposits left un-gathered thereon, even when the device runs aground on a protrusion on the road surface.SOLUTION: The cleaning device comprises a travelling carriage 1 capable of travelling on a road surface, a plate-shaped cleaning member 3 attached to the travelling carriage in a manner rotatable around the width direction of the travelling carriage 1, and an energizing member 4 energizing the cleaning member 3 in the rotation direction, with the lower end of the cleaning member 3 being pressed onto the road surface by the energizing force of the energizing member 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cleaning device and a method for cleaning the top surface of a coke oven. Background Art

[0002] In coke plants, coal is charged into the oven from a charging car traversing the oven top through charging ports on the oven top. At that time, coal dust accumulates on the oven top surface due to leakage of coal dust from the charging car and leakage of coal dust from the coal storage. If the accumulated coal dust is left unattended, sulfur components and the like in the coal dust accelerate corrosion of metal structures such as ascension pipes. Therefore, cleaning of coal dust on the oven top is performed to protect the oven body and prevent environmental pollution caused by dust scattering. The cleaning work on the oven top is heavy labor performed in a high-temperature and dusty environment, and is a dangerous work with risks of heat stroke and dust inhalation.

[0003] As a method for automating this cleaning work, for example, Patent Document 1 and Patent Document 2 disclose a self-propelled cleaning system that pushes and rakes up the object to be cleaned (deposit) with a dozer (cleaning member). Prior Art Documents Patent Documents

[0004] Patent Document 1 Japanese Unexamined Patent Publication No. 2019-017952 Patent Document 2 Japanese Unexamined Patent Publication No. 2000-313883 Summary of Invention Problems to be Solved by the Invention

[0005] The cleaning system of Patent Document 1 cannot change the relative position of the dozer with respect to the main body part. Therefore, for example, when the main body part rides over a convex part or a step on the road surface during traveling, the lower end surface of the cleaning member is lifted off the road surface, and there is a problem that deposits on the road surface cannot be sufficiently raked up by the cleaning member.

[0006] Furthermore, the cleaning system described in Patent Document 2 uses an air cylinder to move the entire cleaning member up and down, resulting in a large operating weight and poor responsiveness. As a result, if the main body of the cleaning member runs over a bump or step in the road surface while driving, there is a time lag until the lower end surface of the cleaning member makes contact with the road surface, which can cause the collected sediment to be missed. The present invention has been made in view of these problems of the prior art, and its purpose is to provide a cleaning device and a method for cleaning the top surface of a coke oven that can collect sediment from the road surface while minimizing the loss of sediment even on road surfaces with bumps or steps. [Means for solving the problem]

[0007] The means to solve the above problems are as follows: [1] A cleaning device comprising a trolley that travels on a road surface, a plate-shaped cleaning member that is rotatably attached to the trolley with the width direction of the trolley as the pivot axis, and a biasing member that biases the cleaning member in the rotational direction, wherein the lower end of the cleaning member is pressed against the road surface by the biasing force of the biasing member. [2] The cleaning device according to [1], wherein the cleaning member is inclined toward the side lagging behind the direction of travel of the trolley. [3] The cleaning device according to [1] or [2], wherein the biasing member is a spring. [4] The cleaning device according to any one of [1] to [3], wherein the cleaning member comprises a dozer which is a plate-shaped member and a scraper or brush provided at the lower end. [5] A method for cleaning the top surface of a coke oven, comprising running a cleaning device described in any of [1] to [4] over the top surface of the coke oven to collect the deposits accumulated on the top surface around the coal charging hole. [Effects of the Invention]

[0008] The cleaning device and method for cleaning the top surface of a coke oven according to the present invention are responsive to bumps and steps on the road surface, allowing the end face of the cleaning member to follow the road surface. As a result, the cleaning device and method for cleaning the top surface of a coke oven according to the present invention can collect accumulated material with minimal loss, even when the material is piled up on a road surface with bumps and steps. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view showing an example of a cleaning device according to this embodiment. [Figure 2] Figure 2 is a side view of the cleaning device. [Figure 3] Figure 3 is a side view of the cleaning device showing the state of cleaning a flat surface. [Figure 4] Figure 4 is a side view of a cleaning device showing the state of cleaning a surface having a protrusion. [Figure 5] Figure 5 is a side view of the cleaning device showing the length of the cleaning member and the height of the holding mechanism. [Figure 6] Figure 6 is a side view of the cleaning device showing the contact state of the cleaning member when it rides up onto a protrusion and tilts. [Figure 7] Figure 7 is a perspective view showing another example of the cleaning device according to this embodiment. [Figure 8] Figure 8 is a perspective view showing the cleaning test in the embodiment. [Modes for carrying out the invention]

[0010] The present invention will be described below through embodiments of the present invention. In the following embodiments, an example will be used in which the cleaning device 10 according to this embodiment is used to clean deposits accumulated on the top surface of a coke oven. However, the cleaning device 10 can be applied not only to the top surface of a coke oven, but also to any surface with protrusions or steps.

[0011] Figure 1 is a perspective view showing an example of the cleaning device 10 according to this embodiment. Figure 2 is a side view of the cleaning device 10. First, the overall configuration of the cleaning device 10 will be explained using Figures 1 and 2.

[0012] The cleaning device 10 according to this embodiment includes a traveling carriage 1, a holding mechanism 2 attached to the front of the traveling carriage 1 via a drive shaft 5, a cleaning member 3 rotatably attached to the holding mechanism 2, and a biasing member 4 that biases the cleaning member 3. The traveling carriage 1 is a carriage equipped with wheels, and the wheels are driven by a drive device such as a motor (not shown) to move freely on the top surface of the coke oven to be cleaned.

[0013] The holding mechanism 2 is for holding the cleaning member 3 and is a plate-shaped member that extends in the width direction of the trolley 1. The holding mechanism 2 is attached to the front of the device body 1 in the direction of travel via the drive shaft 5. The drive shaft 5 can move vertically relative to the trolley 1 by a drive device such as a motor (not shown) provided on the trolley 1. As a result, when cleaning, the drive shaft 5 can be moved downward to move the holding mechanism 2 downward, and the cleaning member 3 attached to the holding mechanism 2 can be brought into contact with the road surface. When not cleaning, the drive shaft 5 can be moved upward to move the holding mechanism 2 upward, and the cleaning member 3 attached to the holding mechanism 2 can be moved away from the road surface. In this way, by moving the cleaning member 3 away from the road surface when not cleaning, the wear (plastic deformation) of the biasing member 4 can be suppressed. The cleaning device 10 has a built-in control device (not shown), which controls the motor that drives the wheels and the motor that moves the drive shaft 5 up and down.

[0014] The cleaning member 3 is constituted by a dozer 3a which is a plate-like member extending in the width direction of the traveling carriage 1, and the dozer 3a is rotatably attached to the holding mechanism 2 extending in the width direction with the width direction of the traveling carriage 1 as the rotation axis. Here, the width direction of the traveling carriage 1 refers to a direction intersecting the traveling direction of the traveling carriage 1, and is not necessarily limited to the direction orthogonal to the advancing direction. The dozer 3a is constituted by a rigid plate, for example, a plate made of resin or metal. As a configuration for making the cleaning member 3 rotatable relative to the holding mechanism 2, for example, it is preferable to provide a hinge at the connection portion between the holding mechanism 2 and the cleaning member 3. However, the configuration of the connection portion between the holding mechanism 2 and the cleaning member 3 is not limited to a hinge, and the connection portion may be constituted by a dust-resistant rotating disk, a bearing, or the like.

[0015] One end (upper end) of the cleaning member 3 is rotatably connected to the holding mechanism 2, and the other end (lower end) is pressed against the road surface by the biasing force of the biasing member 4. In a state where the other end (lower end) of the cleaning member 3 is pressed against the road surface, the traveling carriage 1 travels, whereby deposits on the top surface of the coke oven are raked together. In addition, as shown in FIG. 2, the cleaning member 3 is preferably inclined toward the side lagging with respect to the advancing direction of the traveling carriage 1. This prevents the other end (lower end) of the cleaning member 3 from being caught on protrusions or steps formed on the top surface of the coke oven while the traveling carriage 1 is traveling, and smooth traveling of the traveling carriage 1 is achieved.

[0016] The biasing member 4 is, for example, a metal torsion spring attached to a hinge provided at the connection portion between the holding mechanism 2 and the cleaning member 3. As shown in Figure 2, one end (upper end) of the biasing member 4 is fixed to the holding mechanism 2, and the other end (lower end) is fixed to the cleaning member 3, and the biasing member 4 biases the cleaning member 3 in the rotation direction of the cleaning member 3, which is the direction parallel to the holding mechanism 2 (perpendicular to the road surface). During cleaning, the cleaning member 3 is inclined toward the side lagging behind the traveling direction of the traveling carriage 1 and is in contact with the road surface, so the other end (lower end) of the cleaning member 3 is pressed against the top surface of the coke oven by the biasing force of the biasing member 4. Note that the biasing member 4 is not limited to a torsion spring, and may be various spring members such as a metal leaf spring, a tension spring, a compression spring, a resin spring, or a rubber member. Further, the pressing force of the cleaning member 3 against the top surface of the coke oven may be adjusted by changing the biasing force of the torsion spring.

[0017] Next, a method for cleaning the top surface of a coke oven using the cleaning device 10 will be described. Figure 3 is a side view of the cleaning device 10 showing a state of cleaning a flat surface. When cleaning the top surface of the coke oven, first, the cleaning device 10 moves the drive shaft 5 downward to move the holding mechanism 2 downward, bringing the cleaning member 3 into contact with the top surface of the coke oven. As a result, the other end (lower end) of the cleaning member 3 is kept pressed against the top surface of the coke oven by the biasing force of the biasing member 4. After that, the height of the holding mechanism 2 is fixed, and the wheels are controlled by a non-illustrated control device to cause the cleaning device to travel, so that deposits 6 on the top surface of the coke oven are scraped together by the cleaning member 3.

[0018] Figure 4 is a side view of the cleaning device 10 showing the state of cleaning a surface having a protrusion 7. A protrusion 7 of 10 to 20 mm exists on the top surface of the coke oven. Therefore, as shown in Figure 4, the cleaning device 10 rides up onto the protrusion 7 on the top surface of the coke oven while in motion. However, in the cleaning device 10 according to this embodiment, the cleaning member 3 is constantly biased by the biasing member 4, and the other end (lower end) is pressed against the top surface of the coke oven. Therefore, even if the traveling carriage 1 rides up onto the protrusion 7 and tilts, the cleaning member 3 rotates due to the biasing force of the biasing member 4, and the other end (lower end) of the cleaning member 3 is in close contact with the top surface without any gaps. As a result, even if there are protrusions or steps on the top surface of the coke oven, the cleaning device 10 according to this embodiment can collect the accumulated material on the top surface with minimal loss.

[0019] Figure 5 is a side view of the cleaning device 10 showing the length of the cleaning member 3 and the height of the holding mechanism 2. In the cleaning device 10 according to this embodiment, for example, the height of the holding mechanism 2 is 100 mm and the length of the cleaning member 3 is 150 mm.

[0020] Figure 6 is a side view of the cleaning device 10 showing the contact state of the cleaning member 3 when it rides up on a protrusion and tilts. As shown in Figure 6, even if the cleaning device 10 rides up on a protrusion with a height of 10 mm and the height of the holding mechanism 2 becomes 120 mm, the length of the cleaning member 3 is 150 mm, so the other end (lower end) of the cleaning member 3 can be in close contact with the road surface without any gaps.

[0021] As shown in Figures 5 and 6, in order to ensure that the other end (lower end) of the cleaning member 3 is in close contact with the furnace top surface without any gaps, even when the cleaning device 10 is tilted, it is preferable to set the length of the cleaning member 3 and the height of the holding mechanism 2 such that the length obtained by subtracting the height of the holding mechanism 2 from the length of the cleaning member 3 is at least twice the height of the protrusion or step.

[0022] For example, if the height of the protrusion or step is 20 mm and the height of the holding mechanism 2 during cleaning is 100 mm, the length of the cleaning member 3 should be 140 mm or more. On the other hand, if the cleaning member 3 is made too long, it will come into contact with the trolley 1 when it is tilted to the side lagging behind the direction of travel of the trolley 1. Therefore, the length of the cleaning member 3 should be such that it does not come into contact with the trolley 1 when it is tilted to the side lagging behind the direction of travel of the trolley 1. By determining the length of the cleaning member 3 in this way, it becomes possible to collect even deposits that accumulate on the top surface of a coke oven with protrusions or steps with minimal loss.

[0023] As described above, in the cleaning device 10 according to this embodiment, the cleaning member 3 is rotatably attached to the holding mechanism 2 and biased to press the cleaning member 3 against the road surface. Therefore, even if there are protrusions or steps on the top surface of the coke oven, the other end (lower end) of the cleaning member 3 can be made to adhere tightly to the top surface without any gaps in a responsive manner, and the accumulated material can be collected with minimal loss.

[0024] Furthermore, by using a spring as the biasing member 4, the biasing force of the cleaning member 3 against the furnace top surface can be easily adjusted. In addition, compared to cases where precision equipment such as cylinders or motors are used to press the cleaning member 3 against the furnace top surface, external forces such as electricity or air pressure are not required, so the number of parts in the cleaning device 10 can be reduced, contributing to a reduction in device cost. Moreover, the use of a spring provides good responsiveness, so it can be used even in dusty environments such as the top of a coke oven, and maintenance of the cleaning device 10 is also easier.

[0025] The sediment accumulated on the top surface of the coke oven is fed into the coal charging holes, which are provided on the top surface of the coke oven, and processed thereafter. For this reason, it is preferable to run the cleaning device 10 according to this embodiment on the top surface of the coke oven to collect the sediment and accumulate it around the coal charging holes. In particular, the top surface of the coke oven is prone to protrusions and steps of about 10 to 20 mm, so by using the cleaning device 10 according to this embodiment, it is possible to reduce the amount of sediment that is missed and collect it around the coal charging holes.

[0026] It should be noted that the embodiments of the present invention are not limited to the embodiments described above, and various modifications can be made. In the example shown in Figure 1, the holding mechanism 2 is shown to be located in front of the trolley 1, but this is not limited to this. The holding mechanism 2 may be located in rear of the trolley 1. Furthermore, in this embodiment, the cleaning member 3 is shown to be rotatably attached to the holding mechanism 2, but this is not limited to this, and the cleaning member 3 may be directly and rotatably attached to the trolley 1.

[0027] Figure 7 is a perspective view showing another example of the cleaning device according to this embodiment. The cleaning device 20 shown in Figure 7 differs from the cleaning device 10 shown in Figure 1 in that it has a cleaning member 8 with a resin brush 3b at the other end (lower end) of the dozer 3a. In the cleaning device 20 shown in Figure 7, the same reference numerals are used for components that are the same as those in the cleaning device 10 shown in Figure 1, and their descriptions are omitted.

[0028] The cleaning member 8 of the cleaning device 20 is equipped with a resin brush 3b, for example, a particle size of 1 mm or less and a bulk density of 1.0 g / cm³. 3 This device is suitably used for cleaning coal dust and the like. Depending on the particle size and particle size of the sediment to be cleaned, a rubber scraper or a metal brush may be provided at the other end (lower end) of the dozer 3a instead of the resin brush 3b. In this way, by having a dozer and a scraper or brush in the cleaning member 3, the degree of contact between the cleaning member 3 and the top surface of the coke oven can be improved, and the efficiency of collecting fine sediment can be increased. [Examples]

[0029] Next, as an example, the results of a cleaning test in which coal powder was collected using the cleaning device according to this embodiment will be described. Figure 8 is a perspective view showing the situation of the cleaning test in the embodiment. As shown in Figure 8, approximately 2 kg of coal powder with a maximum particle size of 1 mm or less was scattered in an area of ​​0.3 m wide and 2.0 m long perpendicular to a region in which a step with a width of 0.3 m and a height of 10 mm was formed. Coal powder with a maximum particle size of 1 mm or less means coal that can be sieved through a sieve with a mesh size of 1 mm. In Invention Example 1, the cleaning surface on which coal powder was scattered was cleaned using a cleaning device 20 having a resin brush as shown in Figure 7. The dimensions and biasing force of the cleaning device 20 used in Invention Example 1 are as follows.

[0030] <Cleaning device 20> Height of the holding mechanism from the cleaning surface: 100 mm Cleaning components: Length 150mm (dozer: 100mm, resin brush: 50mm), width 500mm Biasing force of the biasing member: 1.0 N·m

[0031] In Comparative Example 1, the same cleaning device as in Invention Example 1 was used to clean a surface sprinkled with coal dust, except that the tilt angle and vertical position of the cleaning member were fixed without using a biasing member. In Comparative Example 2, the tilt angle of the cleaning member was fixed without using a biasing member. The cleaning member was made movable in the vertical direction by attaching it to a holding part via a slider, and the cleaning member was pressed against the cleaning surface with a pressing force of 10N, except that the same cleaning device as in Invention Example 1 was used to clean a surface sprinkled with coal dust. After cleaning the cleaning surface with the cleaning devices of Invention Example 1, Comparative Examples 1 and 2, the amount of coal dust recovered (recovered amount) and the amount of coal dust remaining on the cleaning surface (residual amount) were measured, and the recovery rate (mass %) was calculated by performing the calculation (recovered amount / (recovered amount + residual amount)) × 100. This operation was repeated three times. Table 1 below shows the recovered amount, residual amount, and recovery rate for the three cleaning tests in Comparative Example 1, Comparative Example 2, and Invention Example 1.

[0032] [Table 1]

[0033] In Comparative Example 1, the cleaning device tilted due to the unevenness of the cleaning surface, and when the cleaning member separated from the cleaning surface, coal powder was missed. As a result, the coal powder recovery rate in Comparative Example 1 was 32-37% by mass. In Comparative Example 2, the cleaning member was pressed against the cleaning surface with a constant pressing force, so the cleaning member was less likely to separate from the cleaning surface than in Comparative Example 1. As a result, although the coal powder recovery rate improved compared to Comparative Example 1, the responsiveness of the cleaning member to protrusions and steps was worse than in Invention Example 1, and coal powder was missed, resulting in a coal powder recovery rate of only 61-65% by mass. In contrast, in Invention Example 1, the cleaning member 8 had high conformability to protrusions and steps and was able to adhere tightly to the cleaning surface without gaps, so the coal powder recovery rate improved to 86-90% by mass. From these results, it was confirmed that by using the cleaning device according to this embodiment, the cleaning member can be made to adhere tightly to the cleaning surface with good responsiveness even on road surfaces with protrusions and steps, thereby reducing the amount of deposited material missed and allowing the deposited material to be collected in the desired location. [Explanation of Symbols]

[0034] 1. Running bogie 2 Retention mechanism 3 Cleaning components 3a Dozer 3b Resin brush 4. Biasing member 5 Drive shaft 6 Sediment 7. Convex part 8 Cleaning components 10 Cleaning equipment 20 Cleaning equipment

Claims

1. A trolley that travels on the road surface, A plate-shaped cleaning member is rotatably attached to the aforementioned trolley, with the width direction of the trolley as the pivot axis, A biasing member that biases the cleaning member in the rotational direction, It has, The lower end of the cleaning member is inclined to lag behind the direction of travel of the trolley, A cleaning device in which the lower end of the cleaning member is pressed against the road surface by the biasing force of the biasing member.

2. The cleaning device according to claim 1, wherein the biasing member is a spring.

3. The cleaning device according to claim 1 or claim 2, wherein the cleaning member comprises a dozer which is a plate-shaped member and a scraper or brush provided at the lower end.

4. A method for cleaning the top surface of a coke oven, A method for cleaning the top surface of a coke oven, comprising running the cleaning device described in claim 1 or claim 2 over the top surface of the coke oven to collect the deposits accumulated on the top surface around the coal charging hole.

5. A method for cleaning the top surface of a coke oven, A method for cleaning the top surface of a coke oven, comprising running the cleaning device described in claim 3 over the top surface of the coke oven to collect the deposits accumulated on the top surface around the coal charging hole.

Images